DEAN WITTER VARIABLE INVESTMENT SERIES
N-30D, 1997-09-08
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DEAN WITTER VARIABLE INVESTMENT SERIES  TWO WORLD TRADE CENTER, NEW YORK, NEW
                                        YORK 10048
LETTER TO THE SHAREHOLDERS JUNE 30, 1997
 
DEAR SHAREHOLDER:
 
The six-month period ended June 30, 1997, was a positive one for domestic
financial markets as well as for most foreign markets. Global economic growth
continued to be strong while inflation remained benign in most regions.
 
GLOBAL ECONOMIC OVERVIEWS
 
UNITED STATES
 
The U.S. stock market continued its impressive rise with the Standard & Poor's
Composite Stock Price Index (S&P 500) gaining 20.62 percent for the period.
Although there was a correction of nearly 10 percent following the Federal
Reserve Board's 25-basis-point rate increase in March, this downturn was
short-lived, as inflation data showed little, if any, pressure.
Large-capitalization companies have dominated the U.S. stock market
year-to-date, but at the period's end small- and mid-sized stocks began to show
signs of breaking out of their slump.
 
Interest rates in the United States rose during the first quarter with the Fed's
modest rate increase in late March. For a time, it appeared as if the Fed was
poised for a series of further increases. However, a slight cooling off of
economic data, an ongoing lack of inflationary pressure and progress toward a
balanced budget agreement combined to create an environment that appeared to
reduce the need for further tightening. Hence, long-term interest rates actually
declined during the second quarter, with the yield on 30-year U.S. Treasury
bonds down 32 basis points, to 6.78 percent.
 
LATIN AMERICA
 
The Latin American equity markets had a spectacular first half. During the first
quarter, these markets gained an average of 15 percent as robust corporate
earnings growth and attractive valuations prompted strong capital inflows. The
region performed even better in the second
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DEAN WITTER VARIABLE INVESTMENT SERIES
LETTER TO THE SHAREHOLDERS JUNE 30, 1997, CONTINUED
 
quarter, gaining an average of 22 percent as the macroeconomic and political
fundamentals continued to improve and corporate earnings results generally
delivered in line with expectations.
 
ASIA
 
The Asian equity markets were mixed, with the flow of capital tapering off from
the high levels seen at the end of 1996. Low earnings-growth momentum and a
continued decline in export growth throughout much of the region depressed
market sentiment. Investors were also concerned about the possibility of further
asset deflation, which had hurt the Thai and Korean stock markets over the past
year.
 
The Northeast Asian markets generally performed well, buoyed by improved
liquidity generated in China. The economic austerity program there was relaxed
as inflation fell below 5 percent (compared to the high twenties of 1995). The
Hong Kong market, which was volatile as a result of concerns regarding U.S.
interest rates and the death of Deng Xiao Peng on February 19, 1997 stabilized
as the July 1 date for the resumption of sovereignty by China approached with
reasonable equanimity. The Taiwanese market remained strong mainly on local
demand, while Korea recovered well from its weakness in 1996, aided by improved
pricing for its DRAM semiconductor chip exports.
 
By contrast, the markets of Southeast Asia were generally weak, with the
exception of Indonesia. Thailand continued its sharp decline as concerns
continued to grow over bad debts within the financial system and as the national
deficit failed to show improvement. Elsewhere in Southeast Asia, the
slower-than-expected recovery in export growth and financial difficulties in
Thailand weighed heavily on investor sentiment. In addition, the action taken by
the central banks of Malaysia and the Philippines to reduce the growth of real
estate loans, designed as well to ensure that Thai-style problems would not
occur in their economies, was not well received by investors. The Singapore
markets were also depressed by these difficulties, despite its enormous surplus
and foreign exchange reserves.
 
JAPAN
 
The Japanese market was exceptionally volatile during the period, starting the
year on a particularly weak note as a result of renewed concerns about the
economy and the state of the financial system. The second quarter, however, saw
a sharp recovery (a 23.7 percent gain in U.S. dollar terms, aided by a 9 percent
appreciation of the currency) as the likelihood of rising rates diminished, hope
for a self-sustaining economic recovery rebounded and the selling pressure that
crushed bank stocks subsided. Despite the strength of the yen, the market
continued to be led by export companies, which are still seeing good demand for
their product.
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DEAN WITTER VARIABLE INVESTMENT SERIES
LETTER TO THE SHAREHOLDERS JUNE 30, 1997, CONTINUED
 
EASTERN EUROPE
 
With the exception of Russia, the stock markets of eastern Europe were depressed
by poor sentiment following a Czech currency crisis. Russian equities continued
to post the region's strongest gains, as concerns surrounding Russian president
Boris Yeltsin's health faded.
 
CONTINENTAL EUROPE
 
European stock markets continued to perform strongly in local currency terms.
However, the rally of the U.S. dollar versus European currencies during 1997
reduced returns for dollar-based investors. These strong markets were
attributable to several factors, most notably continuing improvement in
Continental European economies. The economic recovery is being driven primarily
by exports, because of the more competitive exchange rate between the German
mark and the U.S. dollar and low interest rates across the Continent.
 
The bond markets, especially those in peripheral Continental countries such as
Sweden, Spain and Italy, rallied throughout 1996 on the expectation of a smooth
transition to the Euro currency and as a result of the tight fiscal,
low-inflationary economic environment. However, some doubts have crept in during
1997, giving rise to bond market volatility and hence affecting certain
interest-rate-sensitive sectors, like Spanish utilities.
 
The victory of the Socialist party in France on June 1 produced significant
volatility in the French market but by period-end it was retesting all-time
highs, driven by high liquidity and, to an extent, the absence of damaging new
policies from the incoming government. However, their policies will be clarified
over the summer and a possible increase in corporate taxes, or other measures
that may not be universally welcomed, cannot be ruled out.
 
GREAT BRITAIN
 
The British economy differed sharply from that of Continental Europe in terms of
interest rates, with two increases already having occurred this year. In
addition, the U.K. corporate outlook is somewhat different from that of
companies on the Continent. The strength of the British pound sterling versus
the German mark is seriously hampering exports and thus will affect earnings
growth in cyclical and economically sensitive sectors.
 
On the political front, the widely and accurately predicted return of a Labour
administration during the May elections was viewed positively by the market,
because of the "new" Labour Party's centrist policies and the evident competence
of their senior ministerial team.
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DEAN WITTER VARIABLE INVESTMENT SERIES
LETTER TO THE SHAREHOLDERS JUNE 30, 1997, CONTINUED
 
CAPITAL APPRECIATION PORTFOLIO
 
Since its inception, on January 21, 1997, the Capital Appreciation Portfolio
posted a total return of 3.20 percent versus 14.15 percent for the Standard &
Poor's 500 Composite Stock Price Index (S&P 500) and 5.81 percent for the Lipper
Capital Appreciation Funds Index. The Portfolio's underperformance relative to
these benchmarks was the result of our focus on small-cap stocks -- which
represent about 85 percent of the Fund's total net assets -- at a time when the
market favored larger companies. While this period was disappointing for the
Portfolio, we believe that the small-cap segment of the market remains
undervalued, with greater growth potential than the broader market over the long
term.
 
The Portfolio continues to pursue growth stocks characterized by sound
fundamentals, solid earnings momentum, financial stability and management
strength. While the Portfolio is well diversified across a broad range of
industries, it is more heavily weighted in computer software and services,
commercial services, telecommunications equipment and retailing. Among the
Portfolio's holdings that performed particularly well during the period was
Keane Inc. Going forward, we believe that the current benign interest rate
environment and moderate economic climate bode well for small-cap stocks and
that these issues are positioned to outperform the overall market.
 
CAPITAL GROWTH PORTFOLIO
 
For the six-month period ended June 30, 1997, the Capital Growth Portfolio
posted a total return of 15.55 percent versus 20.62 percent for the S&P 500 and
14.28 percent for the Lipper Growth Funds Index.
 
The Portfolio remained generally fully invested during the period: 52 percent in
large-cap stocks and 48 percent in mid- and small-cap equities. The Portfolio
will remain diversified among stocks of all sizes, as well as across a wide
range of industries. During the period under review, positions were established
in Newpark Resources Inc., Tyco International Ltd., and Smith International,
Inc. The Portfolio sold its positions in HFS Inc., Interpublic Group of
Companies, Inc. and Parametric Technology Corp.
 
DIVIDEND GROWTH PORTFOLIO
 
For the six-month period ended June 30, 1997, the Dividend Growth Portfolio
posted a total return of 17.68 percent versus 20.62 percent for the S&P 500 and
15.52 percent for the Lipper Growth and Income Funds Index.
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DEAN WITTER VARIABLE INVESTMENT SERIES
LETTER TO THE SHAREHOLDERS JUNE 30, 1997, CONTINUED
 
Net assets of the Portfolio totaled more than $1.6 billion on June 30, an
increase of more than $370 million from the end of 1996. One new common stock
position -- Consolidated Natural Gas Co. -- was added to the Portfolio and
another -- PanEnergy Corp. -- was eliminated. As of June 30, the portfolio
consisted of 50 equity issues spread among 31 industry groups and 5 U.S.
Treasury bond and note issues. The Portfolio remained relatively fully invested,
with 98.3 percent of net assets committed to longer-term investments at
period-end.
 
EQUITY PORTFOLIO
 
For the six-month period ended June 30, 1997, the Equity Portfolio posted a
total return of 15.39 percent versus 20.62 percent for the S&P 500 and 14.28
percent for the Lipper Growth Funds Index.
 
The Portfolio was positioned for moderate economic growth through much of the
first half, with a slight overweighting in cyclical stocks. Technology was
overweighted for the majority of the first half, with holdings concentrated in
the semiconductor and telecommunications equipment sectors. In our opinion there
continues to be ample potential for positive earnings surprises in the
semiconductor industry, which is emerging from a slowdown that began in the
fourth quarter of 1995. Telecommunication equipment vendors are benefiting from
strong growth in cellular subscribers and new competitors offering telephone
service worldwide.
 
In addition, the Portfolio was focused on cyclical industries such as
agriculture (5 percent of net assets), energy service (6 percent) and aerospace
(3 percent). We believe these industries will benefit from expansion in
developing markets that have a growing middle class. The Portfolio's global
consumer staples holdings (4 percent) should also benefit from exposure to these
markets. Financial stocks were overweighted at about 16 percent of net assets,
in expectation that continuing industry consolidation will continue to benefit
the sector. Finally, pharmaceutical companies are overweighted at 6 percent of
the Portfolio's assets. In these industries many companies with strong new
product pipelines continue to enjoy pricing power.
 
We continue to believe that the Portfolio's focus on industry selection will
serve it well. We remain overweighted in companies that are well diversified
globally, such as those in the technology, consumer goods and energy segments.
We expect world growth to be healthy and world inflation to remain benign,
allowing these industries to continue producing healthy earnings growth.
 
INCOME BUILDER PORTFOLIO
 
Since its inception, on January 21, 1997, the Income Builder Portfolio posted a
total return of 8.00 percent versus 14.15 percent for the S&P 500 and 14.75
percent for the Lipper Equity Income Funds Index.
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DEAN WITTER VARIABLE INVESTMENT SERIES
LETTER TO THE SHAREHOLDERS JUNE 30, 1997, CONTINUED
 
By June 30, Portfolio assets had grown to over $20 million. The Portfolio's
target asset allocation is 40 percent large-capitalization common stocks, 30
percent convertible securities, 10 percent investment-grade fixed-income
securities, 10 percent high-yield bonds and 10 percent real estate investment
trusts (REITs).
 
On June 30, the large-capitalization segment was 96.6 percent invested, and it
has been relatively fully invested since inception. At period-end, the Portfolio
owned 55 common stocks spread among 29 industry groups.
 
The convertible portion of the Portfolio performed well during the period ended
June 30, although it lagged the broader market for much of that period. This can
be attributed to the fact that the convertible universe consists of many
small-cap companies, which as a group, underperformed large caps until late in
the period. The Portfolio's emphasis on yield also dampened performance but
provided significant downside support as the overall market retreated, toward
the latter half of the first quarter of 1997. We expect convertibles to perform
well in modestly increasing, stable or declining equity markets but to lag
during very strong markets.
 
The REIT portion of the Portfolio also performed well during the period. Our
exposure to this sector is in line with the 10 percent target and is split
between REIT stocks and REIT convertible securities.
 
The fixed-income portion of the Portfolio performed as expected, having fairly
low sensitivity to interest-rate fluctuations. This portion of the Portfolio is
structured to provide maximum current income with low exposure to interest-rate
movements. This strategy helped reduce volatility in the Portfolio during the
period.
 
EUROPEAN GROWTH PORTFOLIO
 
For the six-month period ended June 30, 1997, the European Growth Portfolio
posted a total return of 11.39 percent versus 14.55 percent for the Morgan
Stanley Capital International World Index (MSCI World Index) and 11.40 for the
Lipper European Region Funds Index.
 
The Portfolio is well exposed to cyclical and economically sensitive stocks that
should respond positively to Europe's strengthening economies and is notably
underweighted in financials. Key holdings in the cyclical area, which are
concentrated in Continental Europe, include Volkswagen AG, Scania AB and
Michelin (automotive), Usinor Sacilor (steel), and BASF AG and Hoechst
(chemicals). Pharmaceuticals are particularly well represented (Glaxo Wellcome
PLC, Novartis AG, Roche
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DEAN WITTER VARIABLE INVESTMENT SERIES
LETTER TO THE SHAREHOLDERS JUNE 30, 1997, CONTINUED
 
Holdings AG and Astra AB). The Portfolio's limited exposure to financials is
concentrated in the blue-chip areas of Dutch insurers (Aegon NV, ING Groep NV),
Spanish banks (Banco Popular Espanol SA, Banco Bilbao Vizcaya SA) and U.K. banks
(Barclays, Abbey National PLC).
 
The U.K. remains the Portfolio's largest single country exposure, at
approximately 32 percent, followed by France (14 percent), the Netherlands (12
percent) and Germany (9 percent). The Portfolio is also overweighted in the
smaller markets of Spain and Sweden, with weightings there of 7 percent and 8
percent, respectively. The French and German stocks are hedged partly in the
U.S. dollar, given that we expect the dollar to continue to rally.
 
GLOBAL DIVIDEND GROWTH PORTFOLIO
 
For the six-month period ended June 30, 1997, the Global Dividend Growth
Portfolio provided a total return of 13.98 percent compared to 14.55 percent for
the MSCI World Index and 12.89 for the Lipper Global Funds Index.
 
During the period under review, we decided to gain exposure to both Spain and
Sweden, which were previously not represented in the Portfolio. The Portfolio
remains fully invested and well diversified, with 117 equity issues spread
across the world's largest markets as defined by market capitalization. The
United States, the world's largest market, continues to be the Fund's largest
target weighting, at approximately 30 percent of total net assets spread among
20 stocks. Recent U.S. additions to the Fund include Dow Chemical Co., AT&T
Corp. and GPU, Inc.
 
The Portfolio remains exposed to Japan, the world's second-largest market, with
a target allocation of 24.5 percent of total net assets. While there is still
plenty of pessimism surrounding Japanese stocks in general, we are finding that
many world-class Japanese companies are selling at very attractive prices, which
we believe may offer significant rewards for patient and disciplined long-term
investors.
 
The Portfolio's target allocation to Europe is 35.5 percent made up of the
United Kingdom (10 percent), France (6.5 percent), Germany (7 percent), Italy (4
percent), the Netherlands (3 percent), Switzerland (2 percent), Spain (1.5
percent) and Sweden (1.5 percent). We are very optimistic about the long-term
growth potential of high-quality European common stocks, many of which are more
attractively valued than their U.S. counterparts. In addition, because Europe's
business cycle lags that of the United States, those stocks may be poised for a
period of better earnings growth and superior shareholder returns. European
companies are also far behind their U.S. counterparts in both
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DEAN WITTER VARIABLE INVESTMENT SERIES
LETTER TO THE SHAREHOLDERS JUNE 30, 1997, CONTINUED
 
the breadth and magnitude of restructuring through downsizing, spin-offs and
strategic mergers, all of which are designed to enhance shareholder returns.
With the bulk of these returns yet to be realized, the Portfolio's strategic
overweighting in European issues seems prudent.
 
On the Pacific Rim, the Portfolio has exposure to Hong Kong (4 percent) and
Malaysia (1.5 percent). The Portfolio's managers remain optimistic about the
success of the transition of Hong Kong to Chinese rule and are targeting 4
percent of net assets to high-quality companies positioned to benefit from these
changes. The Portfolio's Malaysian holdings are in companies that are
participating in the development of the region's infrastructure and represent
excellent profit growth potential at reasonable valuations. Our exposure to the
resource-oriented markets of Australia (1.5 percent) and Canada (3 percent)
offers risk reduction through diversification, as well as growth potential, in
economically stable countries.
 
Looking ahead, we will remain sensitive to any factors that would necessitate
changes to the Portfolio's country allocation. We believe that the long-term
outlook for the economies and securities markets of most of the world's major
countries is favorable and that the stocks of well established
large-capitalization international companies should perform well over the long
term.
 
PACIFIC GROWTH PORTFOLIO
 
For the six-month period ended June 30, 1997, the Pacific Growth Portfolio
posted a total return of 1.90 percent versus 14.55 percent for the MSCI World
Index and 7.25 percent for the Lipper Pacific Region Funds Index. This
underperformance was entirely attributable to the Portfolio's underweighting in
Taiwan, which performed particularly well during the period under review. With
this exception, our country allocation choices were positive, with
overweightings in Hong Kong, Australia and Japan. While we do not expect Japan
to outperform the rest of the region significantly over the balance of the year,
we are slightly overweighted in Japan relative to our benchmark because of our
expectation that Japan will outperform over the longer term.
 
Elsewhere, we retain a significant overweighting in Hong Kong. The smooth
transition to China and Hong Kong's new status as a Special Administrative
Region of China should be a significant economic benefit. China has a huge
interest in Hong Kong's success, both as its main conduit for tapping vital
foreign capital and as a potential steppingstone toward a closer relationship
with Taiwan. The emergence of China onto the world stage remains a key positive
factor for the Portfolio going forward. We continue to favor real estate
investment stocks such as Hong Kong Land Holdings Ltd.
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DEAN WITTER VARIABLE INVESTMENT SERIES
LETTER TO THE SHAREHOLDERS JUNE 30, 1997, CONTINUED
 
and Amoy Properties Ltd., as well as certain "red chip" stocks (i.e.,
Chinese-controlled companies listed in Hong Kong), such as Cosco Pacific Ltd.,
China Resources Enterprise Ltd. and Shanghai Industrial Holdings Ltd.
 
We remain underweighted in Southeast Asia but look for opportunities to emerge
there as the present currency instability dies down. We may increase exposure to
these markets later in the year if Hong Kong provides an opportunity for profit
taking. In most of these markets we are defensively positioned in terms of stock
selection, emphasizing utilities and other companies with reliable earnings
growth such as toll-road operators.
 
We also favor the electronics sector regionally in anticipation of continued
demand recovery. Holdings include Samsung Electronics Co. in South Korea,
Venture Manufacturing Ltd. and Amtek Engineering Ltd. in Singapore, Malaysian
Pacific Industries Berhad and O.Y.L. Industries Berhad in Malaysia and United
Micro Electronics in Taiwan.
 
UTILITIES PORTFOLIO
 
For the six-month period ended June 30, 1997, the Utilities Portfolio posted a
total return of 5.65 percent for the first six months of 1997, compared to a
return of 20.62 percent for the broad-based S&P 500 and 7.55 percent for the
Lipper Utilities Funds Index. The Portfolio's relative underperformance during
this period of strong industrial earnings and low inflation is attributable to
the defensive characteristics of utilities in general and the Portfolio
structure in particular.
 
The Portfolio remained fully invested during the first half of 1997, reflecting
improved investor confidence, particularly within the electrical and
telecommunications sectors. At period-end, 89 percent of the Portfolio's net
assets was allocated to utility and utility-related equities. Within the equity
component, 50 percent was allocated to electric utilities, 38 percent to
telecommunications and 12 percent to natural gas. Enhancing overall Portfolio
diversification are selective foreign securities (10 percent of net assets),
which focus on the growth area of global telecommunications.
 
The Portfolio's high-quality fixed-income segment accounted for 10 percent of
net assets, with 1 percent in cash and cash equivalents. The fixed-income
portion of the Portfolio remains well diversified, with a weighted average
credit rating of Baa and BBB+, as measured by Moody's Investor Service Inc. and
Standard & Poor's Corporation, respectively.
 
While the electric utility sector continues to focus on a balanced transition
from a monopolistic to a deregulated environment, the trend of mergers and
acquisitions continued during the first half of 1997. The Portfolio continues to
invest selectively within this sector and remains committed to
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DEAN WITTER VARIABLE INVESTMENT SERIES
LETTER TO THE SHAREHOLDERS JUNE 30, 1997, CONTINUED
 
companies characterized by their low costs combined with good earnings growth
prospects. The telecommunications sector performed well as investors continued
to drive up valuations in anticipation of further industry consolidation and
alliances, and the potential for attractive future earnings. Foreign
telecommunications stocks performed well, due to strong worldwide demand, and
remain a key element in the Portfolio's long-term growth prospects.
 
Natural gas commodity prices and stock performance benefited from favorable
weather and demand patterns. The Portfolio continues to focus on high-quality,
well-diversified pipeline companies.
 
During the second half of 1997, the Portfolio anticipates maintaining its
current fixed-income allocation at or near current levels. We plan to reduce our
allocation to electric utilities modestly in favor of selective
telecommunications growth companies and natural gas companies with growing
unregulated businesses. We may also increase our foreign exposure, to
participate in worldwide telecommunications infrastructure growth. We believe
that the Portfolio is uniquely positioned to take advantage of the opportunities
across all utility sectors and remains structured to meet its long-term total
return objectives.
 
STRATEGIST PORTFOLIO
 
For the six-month period ended June 30, 1997, the Strategist Portfolio posted a
total return of 9.33 percent versus 20.62 percent for the S&P 500, 10.25 percent
for the Lipper Flexible Portfolio Funds Index and 2.74 percent for the Lehman
Brothers Government/Corporate Bond Index.
 
The Strategist Portfolio combines equities, fixed-income securities and money
market instruments to seek total return with lower volatility than most
single-asset funds. While underperformance may occur during periods of extreme
returns in an individual class, diversification can provide a competitive return
with greater net asset value stability.
 
The Portfolio was allocated quite cautiously during the period under review. For
the six months ended June 30, 1997, the Portfolio's target allocation was 60
percent of assets in equities, 20 percent in bonds and 20 percent in cash
equivalents. When compared to an average, or neutrally-balanced portfolio
allocation, our weightings represent a small overweight in stocks (60 percent
versus 55 percent), an underweight in bonds (20 percent versus 35 percent) and a
double weight in cash (20 percent versus 10 percent).
 
With the powerful appreciation of stock and bond prices over the course of the
last few years, valuations have reached levels which have not been seen since
the mid- to late-1980s. A more cautious view toward long-dated financial assets
seems appropriate for several reasons. First, while it
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DEAN WITTER VARIABLE INVESTMENT SERIES
LETTER TO THE SHAREHOLDERS JUNE 30, 1997, CONTINUED
 
is difficult to sell an investment precisely at its peak in a given cycle,
certain data can be used to determine how much return, relative to risk, may be
left. While the Federal Reserve Board seems content to remain on the sidelines
and corporate earnings are growing at a healthy pace, a great deal of positive
expectation is built into asset prices. A more conservative allocation takes
into account the positive backdrop but also enables us to set aside some profits
in the form of cash to take advantage of opportunities in an inevitable market
pullback.
 
Within our specific equity and fixed-income holdings, we utilize portfolio
diversification in a number of industries and sectors to build a well-balanced
portfolio. The equity portfolio is comprised of 48 holdings which provide
industry exposure to nearly all of the S&P 500 groups. Particularly large
weightings include technology (25 percent); autos and retail (20 percent); and
food, beverage and health care (19 percent).
 
The fixed-income portfolio is comprised of 25 corporate bonds (all at or above
investment grade), nine U.S. Treasury bonds and notes and one Canadian
government issued bond. The bond portfolio's average maturity is 16.5 years, and
the average yield is 7.25 percent. We continue to prefer the yield advantage of
the high-quality corporate bond sector, which represents more than 70 percent of
the Portfolio's total bond holdings.
 
HIGH YIELD PORTFOLIO
 
For the six-month period ended June 30, 1997, the High Yield Portfolio posted a
total return of 4.48 percent versus 5.82 percent for the Lehman Brothers
Corporate/High Yield Index and 6.67 percent for the Lipper High Currents Yield
Funds Index.
 
Overall, the high-yield market was one of the better fixed-income performers
during the first half of 1997, benefiting from the strong economy's positive
impact on corporate credit quality. This provided support for high-yield bond
prices, even during times of general weakness in the Treasury market. The
improvement in credit quality, however, resulted in a narrowing of the yield
advantage over Treasuries.
 
With the outlook for the economy and corporate earnings remaining favorable, we
continue to focus on discounted B-rated issues, which we believe offer
attractive long-term total return potential as well as an appealing current
yield. However, given the market's declining yields over the past year and the
possibility of additional fiscal tightening, we have taken certain defensive
steps over the past six to nine months. Most notable has been the increase in
our allocation to higher-quality issues, from 10 percent to 25 percent of the
portfolio. We believe that these holdings will better protect the
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DEAN WITTER VARIABLE INVESTMENT SERIES
LETTER TO THE SHAREHOLDERS JUNE 30, 1997, CONTINUED
 
Portfolio in a potentially nervous market as well as provide the liquidity and
flexibility needed to take advantage of future market corrections. In addition,
we continue to favor either recession-resistant or growth-type industries over
less-stable cyclicals.
 
QUALITY INCOME PLUS PORTFOLIO
 
For the six month period ended June 30, 1997, the Quality Income Plus Portfolio
posted a total return of 3.01 percent versus 3.09 percent for the Lehman
Brothers Aggregate Bond Index.
 
During the first six months of 1997, the weighted average maturity of the
Portfolio ranged from 13.0 to 17.8 years. In April, this maturity extension
locked in a high level of current income, as we purchased more 30-year corporate
bonds. The subsequent resurgence of bond prices generated a strong total return.
The Portfolio also benefited from our overweighting of electric utilities (7.5
percent) as well as brokerage and insurance companies, which together
represented 9.5 percent of the portfolio.
 
We believe that the Portfolio's blend of long-term corporate bonds with AAA
mortgage-backed securities and U.S. government bonds will continue to generate
competitive current income as well as excellent risk-adjusted total return.
 
MONEY MARKET PORTFOLIO
 
As of June 30, 1997, the Money Market Portfolio had net assets in excess of $362
million, with an average life of 67 days. The Portfolio's annualized net yield
for the most recent six-month fiscal period was 5.02 percent and its annualized
yield for June was 5.14 percent.
 
On June 30, 1997, approximately 68 percent of the Portfolio was invested in
high-quality commercial paper, 18 percent in short-term bank notes and
certificates of deposit of major, financially strong commercial banks, 12
percent in bankers' acceptances issued by the same such institutions and the
remaining 2 percent in federal agency obligations.
 
At the end of this fiscal period, more than 88 percent of the Portfolio's assets
was due to mature in less than four months. The Portfolio is thus well
positioned for stability of value with a high degree of liquidity. We continue
to operate the Portfolio in a straight-forward, conservative style without
"structured notes" or derivatives, which could fluctuate excessively with
changes in interest rates.
 
LOOKING AHEAD
 
At this time, we anticipate a moderate pace for economic activity in the United
States during the second half of 1997, with no major adverse surprises in the
rate of inflation. However, it is possible that the Fed may again tighten
monetary policy, seeking to ward off possible inflationary pressure.
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DEAN WITTER VARIABLE INVESTMENT SERIES
LETTER TO THE SHAREHOLDERS JUNE 30, 1997, CONTINUED
 
We believe that markets throughout the world continue to offer attractive total
return potential in the current environment of fiscally tight governmental
policies, strong global economic growth and low inflation. In Europe, the
principal risk to current recovery and strength would be any threat to the
progress of monetary union and the likely turmoil in the bond and currency
markets that would accompany a delay.
 
The tiger markets of Asia continue to trade at attractive multiples of around 16
times 12-month-forward earnings. This rate compares favorably to equity market
valuations elsewhere and to the region's history. However, it remains to be seen
when investors will recognize the value in these markets.
 
We believe that export growth in Japan will improve, aided by enhanced
competitiveness (resulting both from the recent appreciation of the yen and
other recent realignments). In addition, the electronics industry, which is so
important to the region and which had such a difficult 1996, has begun to
recover. Recent data from the United States regarding industry growth bodes well
for exports from the region in the second half.
 
We appreciate your ongoing support of Dean Witter Variable Investment Series and
look forward to continuing to serve your investment needs and objectives.
 
Sincerely,
 
        [SIGNATURE]
CHARLES A. FIUMEFREDDO
CHAIRMAN OF THE BOARD
 
                                     * * *
 
The net asset values (the "NAVs") presented in the financial statements of Dean
Witter Variable Investment Series (the "Fund") reflect the NAVs of each of the
respective Portfolios. The Fund is the underlying investment for various
variable annuity contracts and as such, the NAVs of each Portfolio are not
indicative of the unit values of the insurance company separate accounts.
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES FUND
RESULTS OF SPECIAL MEETING (UNAUDITED)
 
On May 20, 1997, a special meeting of the Fund's shareholders was held for the
purpose of voting on five separate matters, the results of which are as follows:
 
(1) For each Portfolio, approval of a new Investment Management Agreement
    between the Fund and Dean Witter InterCapital Inc. in connection with the
    merger of Morgan Stanley Group Inc. with Dean Witter, Discover & Co.:
<TABLE>
<CAPTION>
VOTE                                                            NO. OF SHARES
- ----------------------------------------------------------  ---------------------
<S>                                                         <C>
Capital Appreciation Portfolio
For.......................................................                762,211
Against...................................................                 22,978
Abstain...................................................                 52,529
Capital Growth Portfolio
For.......................................................              4,965,132
Against...................................................                 43,533
Abstain...................................................                382,633
Dividend Growth Portfolio
For.......................................................             67,139,315
Against...................................................                779,843
Abstain...................................................              4,395,032
Equity Portfolio
For.......................................................             19,000,261
Against...................................................                240,673
Abstain...................................................              1,247,384
Income Builder Portfolio
For.......................................................                762,667
Against...................................................                 10,571
Abstain...................................................                 44,336
European Growth Portfolio
For.......................................................             13,571,452
Against...................................................                219,894
Abstain...................................................                947,482
Global Dividend Growth Portfolio
For.......................................................             25,195,564
Against...................................................                277,070
Abstain...................................................              1,569,449
 
<CAPTION>
VOTE                                                            NO. OF SHARES
- ----------------------------------------------------------  ---------------------
<S>                                                         <C>
Pacific Growth Portfolio
For.......................................................             12,749,455
Against...................................................                185,387
Abstain...................................................                943,607
Utilities Portfolio
For.......................................................             25,392,926
Against...................................................                304,525
Abstain...................................................              1,716,330
Strategist Portfolio
For.......................................................             28,898,740
Against...................................................                239,199
Abstain...................................................              1,999,301
High Yield Portfolio
For.......................................................             42,656,204
Against...................................................                423,411
Abstain...................................................              2,303,199
Quality Income Plus Portfolio
For.......................................................             41,373,361
Against...................................................                340,311
Abstain...................................................              2,937,381
Money Market Portfolio
For.......................................................            309,729,670
Against...................................................              4,766,473
Abstain...................................................             25,822,292
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES FUND
RESULTS OF SPECIAL MEETING (UNAUDITED), CONTINUED
 
    (2) Approval of the new Sub-Advisory Agreements between Dean Witter
       InterCapital Inc. and Morgan Grenfell Investment Services Limited in
       connection with the merger of Morgan Stanley Group Inc.
       with Dean Witter, Discover & Co., with respect to the European Growth
       Portfolio and the Pacific
       Growth Portfolio:
<TABLE>
<CAPTION>
VOTE                                                             NO. OF SHARES
- ------------------------------------------------------------  -------------------
<S>                                                           <C>
European Growth Portfolio
For.........................................................           13,587,735
Against.....................................................              247,309
Abstain.....................................................              903,784
 
<CAPTION>
VOTE                                                             NO. OF SHARES
- ------------------------------------------------------------  -------------------
<S>                                                           <C>
 
Pacific Growth Portfolio
For.........................................................           12,749,455
Against.....................................................              185,387
Abstain.....................................................              943,607
</TABLE>
 
    (3) Election of Trustees:
 
<TABLE>
<CAPTION>
                                                                                                         FOR      WITHHELD
                                                                                                      ----------  --------
<S>                                                                                                   <C>         <C>
Michael Bozic.......................................................................................  620,272,417 24,139,364
Charles A. Fiumefreddo..............................................................................  621,265,032 23,146,749
Edwin J. Garn.......................................................................................  620,112,112 24,299,669
John R. Haire.......................................................................................  619,158,278 25,253,503
Wayne E. Hedien.....................................................................................  621,377,142 23,034,639
Dr. Manuel H. Johnson...............................................................................  621,158,686 23,253,095
Michael E. Nugent...................................................................................  621,239,026 23,172,755
Philip J. Purcell...................................................................................  620,829,413 23,582,368
John L. Schroeder...................................................................................  621,246,722 23,165,059
</TABLE>
 
    (4) Approval of an amendment to the investment policies of the Money
       Market Portfolio to authorize
       the Board to modify the investment policies of the Money Market
       Portfolio:
<TABLE>
<CAPTION>
VOTE
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                                                                                                            <C>
For..........................................................................................................................
Against......................................................................................................................
Abstain......................................................................................................................
 
<CAPTION>
                                                                                                                                NO.
OF
VOTE                                                                                                                            SHAR
ES
- -----------------------------------------------------------------------------------------------------------------------------  -----
- ----
<S>                                                                                                                            <C>
 
For..........................................................................................................................  307,5
98,789
Against......................................................................................................................  10,58
3,193
Abstain......................................................................................................................  22,13
6,453
</TABLE>
 
    (5) Ratification of the selection of Price Waterhouse LLP as the Fund's
       Independent Accountants:
<TABLE>
<CAPTION>
VOTE
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                                                                                                            <C>
For..........................................................................................................................
Against......................................................................................................................
Abstain......................................................................................................................
 
<CAPTION>
                                                                                                                                NO.
OF
VOTE                                                                                                                            SHAR
ES
- -----------------------------------------------------------------------------------------------------------------------------  -----
- ----
<S>                                                                                                                            <C>
 
For..........................................................................................................................  611,0
23,545
Against......................................................................................................................  6,238
,400
Abstain......................................................................................................................  27,14
9,836
</TABLE>
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - MONEY MARKET
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED)
 
<TABLE>
<CAPTION>
                                               ANNUALIZED
 PRINCIPAL                                       YIELD
 AMOUNT IN                                     ON DATE OF         MATURITY
 THOUSANDS                                      PURCHASE            DATE                VALUE
- --------------------------------------------------------------------------------------------------
<C>          <S>                              <C>           <C>                    <C>
             COMMERCIAL PAPER (68.5%)
             AUTOMOTIVE - FINANCE (10.7%)
 $  13,675   Chrysler Financial Corp........   5.60-5.69 %    07/30/97-10/28/97    $    13,479,011
     8,000   Ford Motor Credit Co...........   5.69-5.84      09/15/97-11/06/97          7,872,013
    17,900   General Motors Acceptance
               Corp.........................   5.45-5.99      08/06/97-11/17/97         17,600,845
                                                                                   ---------------
                                                                                        38,951,869
                                                                                   ---------------
             BANK HOLDING COMPANIES (9.8%)
     3,350   BankAmerica Corp...............      5.70            09/22/97               3,306,825
    16,500   Bankers Trust New York Corp....   5.69-5.76      07/03/97-11/12/97         16,377,550
     9,000   J.P. Morgan & Co...............   5.45-5.48     07/09/97- 07/15/97          8,984,874
     4,000   NationsBank Corp...............      5.70            07/10/97               3,994,390
     3,000   PNC Funding Corp...............      5.74            07/25/97               2,988,680
                                                                                   ---------------
                                                                                        35,652,319
                                                                                   ---------------
             BANKS - COMMERCIAL (16.9%)
     6,000   Abbey National North America
               Corp.........................   5.47-5.87      07/11/97-10/10/97          5,947,550
     4,500   ANZ Delaware Inc...............   5.40-5.41      07/21/97-08/19/97          4,474,081
     2,000   International Nederlanden
               (U.S.).......................      5.51            07/08/97               1,997,915
     8,500   National Australia Funding (DE)
               Inc..........................   5.41-5.52      07/28/97-08/08/97          8,458,313
     5,500   Rabobank USA Financial Corp....   5.46-5.51      07/24/97-08/07/97          5,474,883
    14,500   Societe General N.A., Inc......   5.51-5.74      08/26/97-12/10/97         14,305,366
     5,000   Toronto-Dominion Holdings USA
               Inc..........................      5.47            07/02/97               4,999,253
       800   UBS Finance Del................      6.20            07/01/97                 800,000
    14,875   WestPac Capital Corp...........   5.38-5.84      07/15/97-11/14/97         14,705,043
                                                                                   ---------------
                                                                                        61,162,404
                                                                                   ---------------
             BROKERAGE (1.1%)
     4,000   Goldman Sachs Group L.P........      5.63            09/19/97               3,950,578
                                                                                   ---------------
             FINANCE - COMMERCIAL (4.7%)
    17,300   CIT Group Holdings, Inc........   5.70-5.76      08/21/97-11/24/97         17,050,762
                                                                                   ---------------
             FINANCE - CONSUMER (7.4%)
     9,495   Avco Financial Services Inc....   5.66-5.68      07/23/97-09/30/97          9,392,593
     3,000   Household Finance Corp.........      5.78            08/28/97               2,972,595
    14,625   Norwest Financial Inc..........   5.64-5.74      07/22/97-10/01/97         14,484,978
                                                                                   ---------------
                                                                                        26,850,166
                                                                                   ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - MONEY MARKET
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
                                               ANNUALIZED
 PRINCIPAL                                       YIELD
 AMOUNT IN                                     ON DATE OF         MATURITY
 THOUSANDS                                      PURCHASE            DATE                VALUE
- --------------------------------------------------------------------------------------------------
<C>          <S>                              <C>           <C>                    <C>
             FINANCE - DIVERSIFIED (6.3%)
 $   7,100   Associates Corp. of North
               America......................   5.68-5.69 %   07/01/97- 08/13/97    $     7,085,954
    15,800   General Electric Capital
               Corp.........................   5.49-5.86      07/17/97-10/21/97         15,618,931
                                                                                   ---------------
                                                                                        22,704,885
                                                                                   ---------------
             FINANCE - EQUIPMENT (1.3%)
     4,775   Deere (John) Capital Corp......      5.83            10/07/97               4,701,038
                                                                                   ---------------
             HEALTHCARE - DIVERSIFIED (1.7%)
     6,175   Schering Corp..................   5.69-5.80      09/23/97-10/14/97          6,086,401
                                                                                   ---------------
             INDUSTRIALS (3.3%)
    12,220   Caterpillar Financial Services
               Corp.........................   5.44-5.84     08/01/97- 09/17/97         12,105,655
                                                                                   ---------------
             OFFICE EQUIPMENT (3.6%)
     5,050   IBM Credit Corp................      5.65            10/16/97               4,966,696
     8,300   Xerox Credit Corp..............   5.43-5.72      08/12/97-12/16/97          8,178,574
                                                                                   ---------------
                                                                                        13,145,270
                                                                                   ---------------
             RETAIL (0.9%)
     3,250   Sears Roebuck Acceptance
               Corp.........................      5.46            07/31/97               3,235,592
                                                                                   ---------------
             UTILITIES - TELEPHONE (0.8%)
     2,800   AT&T Corp......................      5.51            08/14/97               2,781,588
                                                                                   ---------------
 
             TOTAL COMMERCIAL PAPER
             (AMORTIZED COST $248,378,527).......................................      248,378,527
                                                                                   ---------------
 
             BANKERS' ACCEPTANCES (12.0%)
     7,963   BankBoston, N.A................   5.40-5.47      07/21/97-08/11/97          7,923,613
    15,000   First Union National Bank......   5.74-5.83      09/03/97-10/06/97         14,810,591
     2,500   First Union National Bank of
               Florida......................      5.69            07/24/97               2,491,056
     5,000   NationsBank, N.A...............      5.50            07/09/97               4,994,044
     1,400   Republic National Bank.........      5.64            07/07/97               1,398,705
     7,000   Union Bank of California.......   5.50-5.71      07/29/97-12/09/97          6,908,665
     5,000   U.S. National Bank of Oregon...      5.40            07/07/97               4,995,592
                                                                                   ---------------
 
             TOTAL BANKERS' ACCEPTANCES
             (AMORTIZED COST $43,522,266)........................................       43,522,266
                                                                                   ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - MONEY MARKET
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
                                               ANNUALIZED
 PRINCIPAL                                       YIELD
 AMOUNT IN                                     ON DATE OF         MATURITY
 THOUSANDS                                      PURCHASE            DATE                VALUE
- --------------------------------------------------------------------------------------------------
<C>          <S>                              <C>           <C>                    <C>
             CERTIFICATES OF DEPOSIT (9.8%)
 $  12,500   Chase Manhattan Bank (USA).....   5.65-5.81 %    09/18/97-12/01/97    $    12,500,000
     5,000   Mellon Bank, N.A...............      5.88            11/05/97               5,000,000
    10,000   Regions Bank of Alabama........   5.57-5.80     08/22/97- 09/05/97          9,999,966
     8,000   Union Bank of California,
               N.A..........................   5.54-5.75     07/08/97- 09/09/97          8,000,000
                                                                                   ---------------
 
             TOTAL CERTIFICATES OF DEPOSIT
             (AMORTIZED COST $35,499,966)........................................       35,499,966
                                                                                   ---------------
 
             SHORT-TERM BANK NOTES (8.2%)
     4,000   BankBoston, N.A................      5.72            10/09/97               4,000,000
    12,500   F.C.C. National Bank...........   5.50-5.82      07/09/97-10/02/97         12,500,000
    13,250   La Salle National Bank.........   5.55-5.77      07/14/97-09/04/97         13,250,000
                                                                                   ---------------
 
             TOTAL SHORT-TERM BANK NOTES
             (AMORTIZED COST $29,750,000)........................................       29,750,000
                                                                                   ---------------
 
             U.S. GOVERNMENT AGENCIES (1.8%)
     3,500   Federal Home Loan Banks........      5.56            11/07/97               3,431,773
     3,100   Federal Home Loan Mortgage
               Corp.........................      5.59            07/10/97               3,095,726
                                                                                   ---------------
 
             TOTAL U.S. GOVERNMENT AGENCIES
             (AMORTIZED COST $6,527,499).........................................        6,527,499
                                                                                   ---------------
 
TOTAL INVESTMENTS
  (AMORTIZED COST $363,678,258) (A).........      100.3%   363,678,258
 
LIABILITIES IN EXCESS OF CASH AND OTHER
  ASSETS....................................       (0.3)      (972,807)
                                                  -----   ------------
 
NET ASSETS..................................      100.0%  $362,705,451
                                                  -----   ------------
                                                  -----   ------------
 
<FN>
- ---------------------
(a)  Cost is the same for federal income tax purposes.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - QUALITY INCOME PLUS
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED)
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                    COUPON     MATURITY
 THOUSANDS                                                     RATE        DATE          VALUE
- ---------------------------------------------------------------------------------------------------
<C>          <S>                                             <C>        <C>         <C>
             CORPORATE BONDS (65.0%)
             BANK HOLDING COMPANIES (9.6%)
 $   2,000   Bankers Trust New York Corp...................      9.00 %   08/01/01  $     2,154,600
     2,000   Bankers Trust New York Corp...................      7.375    05/01/08        2,011,680
     2,000   Citicorp......................................      7.25     09/01/08        2,011,260
     5,000   First Bank N.A................................      8.35     11/01/04        5,371,100
     5,000   First Bank System.............................      7.625    05/01/05        5,167,650
     3,500   Malayan Banking Berhad (Malaysia).............      7.125    09/15/05        3,464,160
     3,000   Mellon Bank N.A...............................      7.625    09/15/07        3,098,400
     3,000   Old Kent Financial Corp.......................      6.625    11/15/05        2,903,220
     3,145   PNC Funding Corp..............................      9.875    03/01/01        3,457,770
     5,000   State Street Boston Corp......................      5.95     09/15/03        4,763,500
     2,000   Swiss Bank Corp...............................      7.375    07/15/15        1,990,020
     5,000   Swiss Bank Corp...............................      7.375    06/15/17        4,963,450
     2,000   Wachovia Corp.................................      6.375    04/15/03        1,955,160
                                                                                    ---------------
                                                                                         43,311,970
                                                                                    ---------------
             BEVERAGES (0.5%)
     2,000   Coca-Cola Enterprises Inc.....................      8.50     02/01/22        2,216,700
                                                                                    ---------------
             BROKERAGE (3.2%)
     2,000   Bear Stearns Companies, Inc...................      8.75     03/15/04        2,171,880
     2,000   Donaldson Lufkin & Jenrette, Inc..............      6.875    11/01/05        1,956,900
     3,000   Lehman Brothers Holdings Inc..................      7.25     10/15/03        3,008,190
     2,000   Lehman Brothers Holdings, Inc.................      8.75     03/15/05        2,162,460
     5,000   Lehman Brothers Holdings, Inc.................      8.50     08/01/15        5,323,000
                                                                                    ---------------
                                                                                         14,622,430
                                                                                    ---------------
             COMPUTERS (1.0%)
     5,000   International Business Machines Corp..........      7.125    12/01/96        4,733,800
                                                                                    ---------------
             CONSUMER PRODUCTS (4.0%)
     3,000   Anheuser Busch Co.............................      7.10     06/15/07        3,009,510
     4,000   Becton Dickinson & Co.........................      8.70     01/15/25        4,306,960
     5,000   CPC International, Inc........................      7.25     12/15/26        4,895,500
     1,000   Maytag Corp...................................      9.75     05/15/02        1,118,840
     5,000   Philip Morris Companies, Inc..................      7.125    10/01/04        4,971,950
                                                                                    ---------------
                                                                                         18,302,760
                                                                                    ---------------
             DEFENSE (1.8%)
     3,000   Lockheed Martin Corp..........................      7.70     06/15/08        3,125,040
     5,000   Lockheed Martin Corp..........................      7.20     05/01/36        5,072,800
                                                                                    ---------------
                                                                                          8,197,840
                                                                                    ---------------
             ENERGY (2.7%)
     2,000   Anadarko Petroleum Corp.......................      7.73     09/15/96        2,059,840
     5,000   Dresser Industries, Inc.......................      7.60     08/15/96        5,096,400
       458   Mobil Corp....................................      9.17     02/29/00          475,933
     1,000   Texaco Capital, Inc...........................      9.75     03/15/20        1,253,050
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - QUALITY INCOME PLUS
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                    COUPON     MATURITY
 THOUSANDS                                                     RATE        DATE          VALUE
- ---------------------------------------------------------------------------------------------------
<C>          <S>                                             <C>        <C>         <C>
 $   3,000   Transocean Offshore Inc.......................      8.00 %   04/15/27  $     3,120,150
                                                                                    ---------------
                                                                                         12,005,373
                                                                                    ---------------
             FINANCIAL SERVICES (8.3%)
     3,500   Capital Desjardins Inc. (Canada)..............      7.37     08/08/05        3,537,835
     5,000   Countrywide Funding Corp......................      6.875    09/15/05        4,902,750
     3,000   Equifax, Inc..................................      6.50     06/15/03        2,936,940
     5,000   Finova Capital Corp...........................      7.125    05/17/04        5,024,900
     3,000   Ford Capital BV...............................      9.50     06/01/10        3,555,510
     5,000   Ford Motor Credit Corp........................      7.75     03/15/05        5,193,450
     3,000   General Motors Acceptance Corp................      9.00     10/15/02        3,279,360
     5,000   Nationwide Financial Service..................      8.00     03/01/27        5,053,200
     4,000   Norwest Financial Inc.........................      7.875    02/15/02        4,175,200
                                                                                    ---------------
                                                                                         37,659,145
                                                                                    ---------------
             HEALTHCARE - DIVERSIFIED (2.0%)
     5,000   Columbia/HCA Healthcare Corp..................      9.00     12/15/14        5,714,850
     2,000   Kaiser Foundation Health Plan, Inc............      9.00     11/01/01        2,171,780
     1,000   Kaiser Foundation Health Plan, Inc............      9.55     07/15/05        1,161,030
                                                                                    ---------------
                                                                                          9,047,660
                                                                                    ---------------
             INDUSTRIALS (5.6%)
     5,000   Barrick Gold Corp.............................      7.50     05/01/07        5,112,650
     5,000   Boeing Co.....................................      7.95     08/15/24        5,459,450
     4,924   Burlington Northern Santa Fe Corp.............      7.33     06/23/10        5,033,217
     4,876   Burlington Northern Santa Fe Corp.............      7.97     01/01/15        5,175,321
     1,000   Caterpillar, Inc..............................      9.375    07/15/01        1,092,300
     3,000   Caterpillar, Inc..............................      9.375    08/15/11        3,585,630
                                                                                    ---------------
                                                                                         25,458,568
                                                                                    ---------------
             INSURANCE (4.5%)
     5,000   Cigna Corp....................................      7.875    05/15/27        5,056,850
     3,000   Jackson National Life Insurance Co. - 144A*...      8.15     03/15/27        3,058,740
     5,000   Liberty Mutual Insurance Co. - 144A*..........      7.875    10/15/26        4,981,950
     5,000   Lumbermens Mutual Casualty - 144A*............      9.15     07/01/26        5,484,200
     2,000   Prudential Property Investments...............      7.125    07/01/07        1,995,900
                                                                                    ---------------
                                                                                         20,577,640
                                                                                    ---------------
             PHARMACEUTICALS (1.8%)
     2,000   Bristol-Myers Squibb..........................      6.80     11/15/26        1,896,700
     5,000   Johnson & Johnson.............................      8.72     11/01/24        5,452,450
       733   Marion Merrell Corp...........................      9.11     08/01/05          794,362
                                                                                    ---------------
                                                                                          8,143,512
                                                                                    ---------------
             PUBLISHING (1.1%)
     5,000   Times Mirror Co...............................      7.25     11/15/96        4,765,950
                                                                                    ---------------
             REAL ESTATE INVESTMENT TRUST (1.1%)
     5,000   Kimco Realty Corp.............................      6.50     10/01/03        4,862,250
                                                                                    ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - QUALITY INCOME PLUS
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                    COUPON     MATURITY
 THOUSANDS                                                     RATE        DATE          VALUE
- ---------------------------------------------------------------------------------------------------
<C>          <S>                                             <C>        <C>         <C>
             RESTAURANTS (0.3%)
 $   1,000   McDonald's Corp...............................      8.875%   04/01/11  $     1,161,300
                                                                                    ---------------
             RETAIL (3.8%)
     5,000   May Department Stores Co......................      6.875    11/01/05        4,957,250
     5,000   May Department Stores Co......................      7.625    08/15/13        5,073,550
     1,000   Penney (J.C.) Co., Inc........................      9.75     06/15/21        1,105,560
     3,000   Sears Roebuck Acceptance Corp.................      6.90     08/01/03        3,000,900
     3,000   Wal-Mart Stores, Inc..........................      7.49     06/21/07        3,081,450
                                                                                    ---------------
                                                                                         17,218,710
                                                                                    ---------------
             TELECOMMUNICATIONS (4.2%)
     4,000   AT&T Corp.....................................      8.35     01/15/25        4,179,720
     4,500   Frontier Corp.................................      7.25     05/15/04        4,552,965
     5,000   GTE Corp......................................      7.90     02/01/27        5,042,350
     5,000   Lucent Technologies Inc.......................      7.25     07/15/06        5,096,750
                                                                                    ---------------
                                                                                         18,871,785
                                                                                    ---------------
             TRANSPORTATION (1.1%)
     5,000   America West Airlines.........................      6.85     07/02/09        4,873,400
                                                                                    ---------------
             UTILITIES - ELECTRIC (8.4%)
     1,000   Chugach Electric Co...........................      9.14     03/15/22        1,125,570
     5,000   Consolidated Edison Co. of New York, Inc......      8.05     12/15/27        5,002,350
     4,000   Duke Power Co.................................      8.625    03/01/22        4,114,960
     2,000   Enersis S.A...................................      7.40     12/01/16        1,929,100
     5,000   Florida Power & Light Co......................      7.05     12/01/26        4,691,800
     2,500   Pacificorp....................................      6.71     01/15/26        2,235,325
     5,000   Pennsylvania Power & Light Co.................      7.70     10/01/09        5,248,550
     4,000   Public Service Electric & Gas.................      7.375    03/01/14        3,939,160
     5,000   South Carolina Electric & Gas Co..............      7.625    06/01/23        4,954,750
     5,000   Virginia Electric Power.......................      7.25     02/01/23        4,762,900
                                                                                    ---------------
                                                                                         38,004,465
                                                                                    ---------------
 
             TOTAL CORPORATE BONDS
             (IDENTIFIED COST $289,168,002).......................................      294,035,258
                                                                                    ---------------
 
             MUNICIPAL BOND (0.2%)
             TAXABLE MUNICIPAL BOND (0.2%)
     4,000   New Jersey Development Authority (IDENTIFIED
               COST $927,080)..............................      0.00     02/15/17          928,040
                                                                                    ---------------
 
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - QUALITY INCOME PLUS
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                          COUPON          MATURITY
 THOUSANDS                                           RATE             DATE                VALUE
- ----------------------------------------------------------------------------------------------------
<S>          <S>                                   <C>        <C>                    <C>
             U.S. GOVERNMENT & AGENCY OBLIGATIONS (31.2%)
 $      18   Federal Home Loan Mortgage Corp.....     11.50 %   06/01/11-05/01/19    $        19,963
     3,098   Federal Home Loan Mortgage Corp. PC
               Gold..............................      8.50     01/01/22-12/01/24          3,220,108
    13,547   Federal National Mortgage Assoc.....      7.50     04/01/27-06/01/27         13,556,672
     1,249   Federal National Mortgage Assoc.....      9.00     06/01/21-02/01/25          1,315,939
    30,300   Government National Mortgage
               Assoc.............................      7.00            (a)                29,750,812
       668   Government National Mortgage
               Assoc.............................      7.50     04/15/24-03/15/26            670,005
    23,000   Government National Mortgage
               Assoc.............................      7.50            (a)                23,064,688
    19,377   Government National Mortgage
               Assoc.............................      8.00     10/15/24-09/15/26         19,818,977
     5,000   Government National Mortgage
               Assoc.............................      8.00            (a)                 5,114,062
     4,924   Government National Mortgage
               Assoc.............................      8.50     01/15/17-07/15/26          5,118,451
     3,129   Government National Mortgage
               Assoc.............................      9.00     07/15/24-12/15/24          3,306,332
       201   Government National Mortgage
               Assoc.............................     10.00     05/15/16-04/15/19            219,765
     5,000   Tennessee Valley Authority..........      7.85         06/15/44               5,060,950
     2,000   U.S. Treasury Bond..................      6.625        02/15/27               1,956,920
    10,000   U.S. Treasury Bond..................      6.50         11/15/26               9,588,900
    10,000   U.S. Treasury Note..................      6.25         01/31/02               9,945,000
     2,000   U.S. Treasury Note..................      6.25         06/30/02               1,988,100
     7,000   U.S. Treasury Note..................      7.00         07/15/06               7,202,930
                                                                                     ---------------
 
             TOTAL U.S. GOVERNMENT & AGENCY OBLIGATIONS
             (IDENTIFIED COST $139,848,138)........................................      140,918,574
                                                                                     ---------------
 
             FOREIGN GOVERNMENT OBLIGATIONS (2.5%)
     5,000   Hydro-Quebec (Canada)...............      9.50         11/15/30               6,063,300
     5,000   Province of New Brunswick
               (Canada)..........................      7.625        06/29/04               5,231,800
                                                                                     ---------------
 
             TOTAL FOREIGN GOVERNMENT OBLIGATIONS
             (IDENTIFIED COST $10,380,050).........................................       11,295,100
                                                                                     ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - QUALITY INCOME PLUS
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                    COUPON     MATURITY
 THOUSANDS                                                     RATE        DATE          VALUE
- ---------------------------------------------------------------------------------------------------
<S>          <S>                                   <C>        <C>                    <C>
             SHORT-TERM INVESTMENTS (b) (12.4%)
             COMMERICAL PAPER
             FINANCE - DIVERSIFIED (4.4%)
 $  20,000   General Electric Capital Corp.................      5.54 %   07/21/97  $    19,938,444
                                                                                    ---------------
             U.S. GOVERNMENT AGENCIES (8.0%)
    29,840   Federal Home Loan Banks.......................      5.37     07/21/97       29,750,781
     6,500   Federal Home Loan Mortgage Corp...............      6.00     07/01/97        6,500,000
                                                                                    ---------------
                                                                                         36,250,781
                                                                                    ---------------
 
             TOTAL SHORT-TERM INVESTMENTS
             (IDENTIFIED COST $56,189,225)........................................       56,189,225
                                                                                    ---------------
 
TOTAL INVESTMENTS
  (IDENTIFIED COST $496,512,495) (C)........      111.3%   503,366,197
 
LIABILITIES IN EXCESS OF CASH AND OTHER
  ASSETS....................................      (11.3)   (50,984,360)
                                                  -----   ------------
 
NET ASSETS..................................      100.0%  $452,381,837
                                                  -----   ------------
                                                  -----   ------------
 
<FN>
- ---------------------
 *   Resale is restricted to qualified institutional investors.
(a)  Securities purchased on a forward commitment basis with an approximate
     principal amount and no definite maturity date; the actual principal
     amount and maturity date will be determined upon settlement.
(b)  Securities were purchased on a discount basis. The interest rates shown
     have been adjusted to reflect a money market equivalent yield.
(c)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation is $9,017,790 and the
     aggregate gross unrealized depreciation is $2,164,088, resulting in net
     unrealized appreciation of $6,853,702.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - HIGH YIELD
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED)
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                   COUPON      MATURITY
 THOUSANDS                                                    RATE         DATE          VALUE
- ---------------------------------------------------------------------------------------------------
<C>          <S>                                           <C>          <C>         <C>
             CORPORATE BONDS (95.1%)
             AEROSPACE (1.3%)
 $   3,800   Sabreliner Corp. (Series B).................    12.50 %      04/15/03  $     3,952,000
                                                                                    ---------------
             AUTOMOTIVE (6.5%)
     3,675   APS, Inc....................................      11.875     01/15/06        3,546,375
     4,000   Envirotest Systems, Inc.....................       9.125     03/15/01        3,850,000
     6,000   General Motors Acceptance Corp..............      15.00      03/17/98        6,380,580
     6,000   Toyota Motor Credit Corp....................      15.00      09/26/97        6,129,240
                                                                                    ---------------
                                                                                         19,906,195
                                                                                    ---------------
             BROADCAST MEDIA (6.8%)
     2,000   Adams Outdoor Advertising L.P...............      10.75      03/15/06        2,135,000
     6,000   Australis Holdings Ltd......................      15.00++    11/01/02        4,380,000
     3,000   Echostar DBS Corp. - 144A*..................      12.50      07/01/02        2,970,000
     3,500   Echostar Satellite Broadcasting.............      13.125++   03/15/04        2,485,000
     2,000   Paxson Communications Corp..................      11.625     10/01/02        2,160,000
     3,505   Spanish Broadcasting System, Inc............      12.50      06/15/02        3,881,787
     4,500   TCI Satellite Entertainment Corp. - 144A*...      12.25++    02/15/07        2,655,000
                                                                                    ---------------
                                                                                         20,666,787
                                                                                    ---------------
             BUSINESS SERVICES (3.8%)
     6,000   Anacomp, Inc. - 144A*.......................      10.875     04/01/04        6,180,000
     5,000   Xerox Credit Corp...........................      15.00      06/26/98        5,443,600
                                                                                    ---------------
                                                                                         11,623,600
                                                                                    ---------------
             CABLE & TELECOMMUNICATIONS (17.0%)
     3,033   Adelphia Communications Corp. (Series B)....       9.50+     02/15/04        2,903,892
     3,000   Adelphia Communications, Inc. - 144A*.......       9.875     03/01/07        2,917,500
     5,000   American Communications Services, Inc.......      13.00++    11/01/05        3,000,000
     3,100   American Communications Services, Inc.......      12.75++    04/01/06        1,736,000
     2,350   Cablevision Systems Corp....................      10.50      05/15/16        2,555,625
     1,975   Cablevision Systems Corp....................       9.875     04/01/23        2,054,000
     2,000   Charter Communication South East L.P.
               (Series B)................................      11.25      03/15/06        2,140,000
     7,259   Falcon Holdings Group L.P. (Series B).......      11.00+     09/15/03        7,258,943
     3,000   Frontiervision Operating Partners, L.P......      11.00      10/15/06        3,127,500
     3,000   GST Equipment Funding, Inc. - 144A*.........      13.25      05/01/07        3,217,500
     8,000   Hyperion Telecommunication, Inc. (Series
               B)........................................      13.00++    04/15/03        4,099,200
    28,500   In-Flight Phone Corp.
               (Series B) (a)............................      14.00++    05/15/02        2,707,500
     2,000   IXC Communications, Inc.
               (Series B)................................      12.50      10/01/05        2,290,000
     1,500   Paging Network, Inc.........................      10.125     08/01/07        1,455,000
     3,000   Paging Network, Inc.........................      10.00      10/15/08        2,880,000
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - HIGH YIELD
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                   COUPON      MATURITY
 THOUSANDS                                                    RATE         DATE          VALUE
- ---------------------------------------------------------------------------------------------------
<C>          <S>                                           <C>          <C>         <C>
 $   2,000   Peoples Telephone Co., Inc..................    12.25 %      07/15/02  $     2,120,000
     3,000   Rifkin Acquisition Partners L.P.............      11.125     01/15/06        3,187,500
     2,750   Shared Technology/Fairchild, Inc............      12.25++    03/01/06        2,468,125
                                                                                    ---------------
                                                                                         52,118,285
                                                                                    ---------------
             COMPUTER EQUIPMENT (5.6%)
     2,000   Advanced Micro Devices, Inc.................      11.00      08/01/03        2,225,000
     6,000   IBM Credit Corp.............................      15.00      03/04/98        6,361,740
     2,000   Unisys Corp.................................      15.00      07/01/97        2,000,000
     4,855   Unisys Corp. (Conv.)........................       8.25      03/15/06        6,432,001
                                                                                    ---------------
                                                                                         17,018,741
                                                                                    ---------------
             CONSUMER PRODUCTS (1.9%)
     3,000   J.B. Williams Holdings, Inc.................      12.00      03/01/04        3,090,000
     2,500   Renaissance Cosmetics, Inc..................      11.75      02/15/04        2,587,500
                                                                                    ---------------
                                                                                          5,677,500
                                                                                    ---------------
             CONTAINERS (1.7%)
     2,000   Mail-Well Corp..............................      10.50      02/15/04        2,130,000
     3,000   Packaging Resources, Inc....................      11.625     05/01/03        3,120,000
                                                                                    ---------------
                                                                                          5,250,000
                                                                                    ---------------
             ELECTRICAL & ALARM SYSTEMS (1.8%)
     6,500   Mosler, Inc.................................      11.00      04/15/03        5,590,000
                                                                                    ---------------
             ENTERTAINMENT/GAMING & LODGING (9.9%)
     2,000   AMF Group Inc. (Series B)...................      10.875     03/15/06        2,160,000
     5,350   Fitzgeralds Gaming Corp. (Units)++..........      13.00      12/31/02        4,520,750
     3,740   Lady Luck Gaming Finance Corp...............      11.875     03/01/01        3,796,100
     8,000   Motels of America, Inc. (Series B)..........      12.00      04/15/04        7,440,000
     3,000   Players International, Inc..................      10.875     04/15/05        3,075,000
     3,400   Plitt Theaters, Inc. (Canada)...............      10.875     06/15/04        3,595,500
     3,000   Station Casinos, Inc. (Series B)............       9.625     06/01/03        2,970,000
     3,000   Stuart Entertainment, Inc.
               (Series B)................................      12.50      11/15/04        2,895,000
                                                                                    ---------------
                                                                                         30,452,350
                                                                                    ---------------
             FINANCIAL (6.5%)
     5,000   Commercial Credit Co........................      15.00      07/10/98        5,445,000
     8,000   General Electric Capital Corp...............      13.50      01/20/98        8,339,360
     6,000   Household Finance Corp......................      15.00      09/25/97        6,126,900
                                                                                    ---------------
                                                                                         19,911,260
                                                                                    ---------------
             FOODS & BEVERAGES (7.4%)
     4,330   Envirodyne Industries, Inc..................      10.25      12/01/01        4,351,650
     2,500   Fleming Companies, Inc......................      10.625     12/15/01        2,662,500
     6,000   General Millls, Inc.........................      13.50      01/21/98        6,249,960
    20,250   Specialty Foods Acquisition Corp. (Series
               B)........................................      13.00++    08/15/05        9,416,250
                                                                                    ---------------
                                                                                         22,680,360
                                                                                    ---------------
             HEALTHCARE (4.2%)
     7,750   Unilab Corp.................................      11.00      04/01/06        7,052,500
     7,000   Unison Healthcare Corp. - 144A*.............      12.25      11/01/06        5,845,000
                                                                                    ---------------
                                                                                         12,897,500
                                                                                    ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - HIGH YIELD
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                   COUPON      MATURITY
 THOUSANDS                                                    RATE         DATE          VALUE
- ---------------------------------------------------------------------------------------------------
<C>          <S>                                           <C>          <C>         <C>
             MANUFACTURING (3.8%)
 $   2,000   Berry Plastics Corp.........................    12.25 %      04/15/04  $     2,200,000
     2,500   Deere John Capital Corp.....................      15.00      02/24/98        2,645,150
     2,000   Exide Electronics Group, Inc. (Series B)....      11.50      03/15/06        2,150,000
     2,000   International Wire Group, Inc...............      11.75      06/01/05        2,180,000
     2,500   Uniroyal Technology Corp....................      11.75      06/01/03        2,487,500
                                                                                    ---------------
                                                                                         11,662,650
                                                                                    ---------------
             MANUFACTURING - DIVERSIFIED (5.9%)
     2,090   Foamex L.P..................................      11.875     10/01/04        2,246,750
     3,000   Interlake Corp..............................      12.00      11/15/01        3,330,000
     3,000   Interlake Corp..............................      12.125     03/01/02        3,150,000
     3,000   J.B. Poindexter & Co., Inc..................      12.50      05/15/04        3,030,000
     2,000   Jordan Industries, Inc......................      10.375     08/01/03        2,100,000
     7,200   Jordan Industries, Inc. - 144A*.............      11.75++    04/01/09        4,068,000
                                                                                    ---------------
                                                                                         17,924,750
                                                                                    ---------------
             PUBLISHING (1.7%)
     2,000   American Media Operations, Inc..............      11.625     11/15/04        2,190,000
     2,975   United States Banknote Corp.................      10.375     06/01/02        3,019,625
                                                                                    ---------------
                                                                                          5,209,625
                                                                                    ---------------
             RESTAURANTS (4.4%)
     7,750   American Restaurant Group Holdings, Inc.....      14.00++    12/15/05        2,964,375
     3,500   Boston Chicken, Inc.........................       4.50      02/01/04        2,671,655
     3,000   Carrols Corp................................      11.50      08/15/03        3,202,500
     4,500   FRD Acquisition Corp. (Series B)............      12.50      07/15/04        4,781,250
                                                                                    ---------------
                                                                                         13,619,780
                                                                                    ---------------
             RETAIL (1.7%)
    10,450   County Seat Stores, Inc. (b)................      12.00      10/01/02        5,120,500
                                                                                    ---------------
             RETAIL - FOOD CHAINS (2.2%)
     3,000   Jitney-Jungle Stores of America, Inc........      12.00      03/01/06        3,345,000
     3,500   Pathmark Stores, Inc........................       9.625     05/01/03        3,368,750
                                                                                    ---------------
                                                                                          6,713,750
                                                                                    ---------------
             TEXTILES - APPAREL MANUFACTURERS (1.0%)
     4,000   U.S. Leather, Inc...........................      10.25      07/31/03        3,020,000
                                                                                    ---------------
 
             TOTAL CORPORATE BONDS
             (IDENTIFIED COST $298,262,311).......................................      291,015,633
                                                                                    ---------------
</TABLE>
 
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES
- -----------
<C>          <S>                                                                       <C>
             COMMON STOCKS (c) (0.8%)
             AUTOMOTIVE (0.0%)
        87   Northern Holdings Industrial Corp. (d)..................................        --
                                                                                       ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - HIGH YIELD
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                                                    VALUE
- ------------------------------------------------------------------------------------------------------
<C>          <S>                                                                       <C>
             ENTERTAINMENT/GAMING & LODGING (0.0%)
     2,000   Motels of America, Inc. - 144A*.........................................  $        30,072
    71,890   Vagabond Inns, Inc. (Class D) (a).......................................        --
                                                                                       ---------------
                                                                                                30,072
                                                                                       ---------------
             FOODS & BEVERAGES (0.0%)
   120,000   Specialty Foods Acquisition Corp. - 144A*...............................          120,000
                                                                                       ---------------
             MANUFACTURING - DIVERSIFIED (0.8%)
    84,072   Thermadyne Holdings Corp. (d)...........................................        2,532,669
                                                                                       ---------------
             RESTAURANTS (0.0%)
     7,750   American Restaurant Group Holdings, Inc. - 144A*........................            7,750
                                                                                       ---------------
 
             TOTAL COMMON STOCKS
             (IDENTIFIED COST $8,566,039)............................................        2,690,491
                                                                                       ---------------
 
             PREFERRED STOCKS (0.6%)
             ENTERTAINMENT/GAMING & LODGING (0.6%)
    80,000   Fitzgeralds Gaming Corp. (Units)++
               (Identified Cost $2,000,000)..........................................        1,880,000
                                                                                       ---------------
</TABLE>
 
<TABLE>
<CAPTION>
 NUMBER OF                                                              EXPIRATION
 WARRANTS                                                                  DATE
- -----------                                                             -----------
<C>          <S>                                                        <C>          <C>
             WARRANTS (c) (0.1%)
             AEROSPACE (0.0%)
     1,500   Sabreliner Corp. - 144A*.................................     04/15/03           15,000
                                                                                     ---------------
             BROADCAST MEDIA (0.0%)
     6,000   Australis Holdings Ltd. - 144A*..........................     10/30/01        --
                                                                                     ---------------
             CABLE & TELECOMMUNICATIONS (0.0%)
     2,000   Hyperion Telecommunication, Inc. (Series B) - 144A*......     04/01/01           60,060
                                                                                     ---------------
             CONTAINERS (0.0%)
     2,000   Crown Packaging Holdings, Ltd. (Canada) - 144A*..........     11/01/03        --
                                                                                     ---------------
             ENTERTAINMENT/GAMING & LODGING (0.0%)
     1,000   Boomtown, Inc. - 144A*...................................     11/01/98        --
     2,000   Fitzgeralds Gaming Corp..................................     12/19/98            2,045
     3,500   Fitzgeralds South Inc. - 144A*...........................     03/15/99        --
                                                                                     ---------------
                                                                                               2,045
                                                                                     ---------------
             MANUFACTURING (0.1%)
     2,000   Exide Electronics Group, Inc. - 144A*....................     03/15/06           50,040
    15,000   Uniroyal Technology Corp.................................     06/01/03           26,250
                                                                                     ---------------
                                                                                              76,290
                                                                                     ---------------
             RETAIL (0.0%)
     2,000   County Seat Holdings Co..................................     10/15/98        --
                                                                                     ---------------
 
             TOTAL WARRANTS
             (IDENTIFIED COST $326,489)............................................          153,395
                                                                                     ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - HIGH YIELD
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN                                                   COUPON      MATURITY
 THOUSANDS                                                    RATE         DATE          VALUE
- ---------------------------------------------------------------------------------------------------
<C>          <S>                                           <C>          <C>         <C>
             SHORT-TERM INVESTMENTS (3.1%)
             U.S. GOVERNMENT AGENCY (e) (3.0%)
 $   9,000   Federal Home Loan Mortgage Corp. (Amortized
               Cost $9,000,000)..........................     6.00 %      07/01/97  $     9,000,000
                                                                                    ---------------
 
             REPURCHASE AGREEMENT (0.1%)
       408   The Bank of New York (dated 06/30/97;
               proceeds $408,141; collateralized by
               $222,000 U.S. Treasury Bills 5.11% due
               09/11/97 valued at $219,731, $115,520 U.S.
               Treasury Note 8.375% due 08/15/08 valued
               at $129,940 and $67,240 U.S.Treasury Note
               5.875% due 06/30/00 valued at $66,567)
               (Identified Cost $408,076)................       5.75      07/01/97          408,076
                                                                                    ---------------
 
             TOTAL SHORT-TERM INVESTMENTS
             (IDENTIFIED COST $9,408,076).........................................        9,408,076
                                                                                    ---------------
 
TOTAL INVESTMENTS
  (IDENTIFIED COST $318,562,915) (F).........       99.7 %  305,147,595
 
OTHER ASSETS IN EXCESS OF LIABILITIES........        0.3        883,673
                                                   -----   ------------
 
NET ASSETS...................................      100.0 % $306,031,268
                                                   -----   ------------
                                                   -----   ------------
 
<FN>
- ---------------------
 *   Resale is restricted to qualified institutional investors.
++   Consists of one or more class of securities traded together as a unit;
     bonds or preferred stock with attached warrants.
 +   Payment-in-kind security.
++   Currently a zero coupon bond and will pay interest at the rate shown at a
     future specified date.
(a)  Non-income producing security; issuer in bankruptcy.
(b)  Non-income producing security; bond in default.
(c)  Non-income producing securities.
(d)  Acquired through exchange offer.
(e)  Security was purchased on a discount basis. The interest rate shown has
     been adjusted to reflect a money market equivalent yield.
(f)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation is $13,564,779 and the
     aggregate gross unrealized depreciation is $26,980,099, resulting in net
     unrealized depreciation of $13,415,320.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - UTILITIES
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED)
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
             COMMON STOCKS (88.7%)
             NATURAL GAS (10.5%)
    60,000   Apache Corp.........................  $     1,950,000
   105,000   Burlington Resources, Inc...........        4,633,125
   115,230   El Paso Natural Gas Co..............        6,337,650
   100,000   Enron Corp..........................        4,081,250
   140,000   ENSERCH Corp........................        3,115,000
    70,000   Louisiana Land & Exploration Co.....        3,998,750
   125,000   Questar Corp........................        5,046,875
   175,000   Seagull Energy Corp.*...............        3,062,500
    85,000   Union Texas Petroleum Holdings,
               Inc...............................        1,779,687
   200,000   Williams Companies, Inc.............        8,750,000
                                                   ---------------
                                                        42,754,837
                                                   ---------------
             TELECOMMUNICATIONS (33.2%)
    76,666   360 DEG. Communications Co.*........        1,312,905
   120,000   Airtouch Communications, Inc.*......        3,285,000
   205,000   Alltel Corp.........................        6,854,687
   120,000   AT&T Corp...........................        4,207,500
   240,000   BCE, Inc. (Canada)..................        6,720,000
   250,000   Cable & Wireless PLC (ADR) (United
               Kingdom)..........................        6,984,375
   160,000   Century Telephone Enterprises,
               Inc...............................        5,390,000
   175,000   Ericsson (L.M.) Telephone Co. (Class
               B) (ADR) (Sweden).................        6,890,625
   150,000   Frontier Corp.......................        2,990,625
   150,000   GTE Corp............................        6,581,250
    31,992   Lucent Technologies, Inc............        2,305,423
   175,000   MCI Communications Corp.............        6,693,750
    55,000   Northern Telecom Ltd. (Canada)......        5,005,000
   120,000   NYNEX Corp..........................        6,915,000
   182,173   SBC Communications, Inc.............       11,271,954
   145,000   Southern New England
               Telecommunications Corp...........        5,636,875
   125,000   Sprint Corp.........................        6,578,125
    65,000   Tele Danmark AS (ADR) (Denmark).....        1,698,125
    71,875   Tele-Communications Liberty Media
               Group (Class A)*..................        1,707,031
   135,000   Telecom Corp.of New Zealand Ltd.
               (ADR) (New Zealand)...............        5,501,250
    60,000   Telefonica de Argentina S.A. (ADR)
               (Class B) (Argentina).............        2,077,500
    90,000   Telefonos de Mexico S.A. de C.V.
               (Series L) (ADR) (Mexico).........        4,297,500
 
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
   130,000   Telephone & Data Systems, Inc.......  $     4,940,000
    50,300   Teleport Communications Group Inc.
               (Class A)*........................        1,710,200
   110,000   U.S. West Communications Group,
               Inc...............................        4,145,625
   140,000   U.S. West Media Group*..............        2,835,000
   354,500   WorldCom, Inc.*.....................       11,321,844
                                                   ---------------
                                                       135,857,169
                                                   ---------------
             UTILITIES - ELECTRIC (45.0%)
   210,000   Baltimore Gas & Electric Co.........        5,604,375
   135,000   Carolina Power & Light Co...........        4,843,125
   145,000   Central & South West Corp...........        3,081,250
   220,865   CINergy Corp........................        7,688,863
   235,000   CMS Energy Corp.....................        8,283,750
   130,000   Consolidated Edison Co. of New York,
               Inc...............................        3,826,875
   215,000   DPL, Inc............................        5,294,375
   212,500   DQE, Inc............................        6,003,125
   155,000   DTE Energy Co.......................        4,281,875
   146,216   Duke Energy Corp....................        7,009,230
   130,000   Edison International................        3,233,750
   140,000   Enova Corp..........................        3,368,750
   215,000   Entergy Corp........................        5,885,625
   140,000   FPL Group, Inc......................        6,448,750
   175,000   General Public Utilities Corp.......        6,278,125
   125,000   Hawaiian Electric Industries,
               Inc...............................        4,828,125
   200,000   Houston Industries, Inc.............        4,287,500
   235,000   Illinova Corp.......................        5,170,000
   225,000   IPALCO Enterprises, Inc.............        7,031,250
   145,000   Kansas City Power &
               Light Co..........................        4,141,563
    85,000   Montana Power Co....................        1,970,938
   110,000   New England Electric System.........        4,070,000
   110,000   New York State Electric & Gas
               Corp..............................        2,296,250
   170,000   NIPSCO Industries, Inc..............        7,023,125
   295,000   PacifiCorp..........................        6,490,000
   230,000   Pinnacle West Capital Corp..........        6,914,375
   100,000   Portland General Corp...............        3,968,750
    75,000   Potomac Electric Power Co...........        1,734,375
   200,000   Public Service Company of
               Colorado..........................        8,300,000
   215,000   Public Service Company of New
               Mexico............................        3,843,125
   125,000   Public Service Enterprise Group,
               Inc...............................        3,125,000
   205,000   SCANA Corp..........................        5,086,563
   275,000   Southern Co.........................        6,015,625
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - UTILITIES
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
   130,000   Texas Utilities Co..................  $     4,476,875
   200,000   Western Resources, Inc..............        6,487,500
   215,000   Wisconsin Energy Corp...............        5,348,125
                                                   ---------------
                                                       183,740,907
                                                   ---------------
             TOTAL COMMON STOCKS
             (IDENTIFIED COST $277,673,135)......      362,352,913
                                                   ---------------
</TABLE>
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN
 THOUSANDS
- -----------
<C>          <S>                                   <C>
             CORPORATE BONDS (10.0%)
             NATURAL GAS (1.9%)
 $   2,750   AGL Capital Trust - 144A** 8.17% due
               06/01/37..........................        2,732,097
     3,000   Coastal Corp.
               7.75% due 10/15/35................        3,001,200
     2,000   Panhandle Eastern Corp. 8.625% due
               04/15/25..........................        2,109,140
                                                   ---------------
                                                         7,842,437
                                                   ---------------
             TELECOMMUNICATIONS (1.1%)
     2,000   Southwestern Bell Telephone Co.
               7.20% due 10/15/26................        1,896,140
     2,000   Sprint Corp.
               9.25% due 04/15/22................        2,382,180
                                                   ---------------
                                                         4,278,320
                                                   ---------------
             UTILITIES - ELECTRIC (7.0%)
     2,000   Carolina Power & Light Co. 6.875%
               due 08/15/23......................        1,830,880
     2,500   Consolidated Edison Co. of New York,
               Inc. 8.05% due 12/15/27...........        2,501,175
     2,000   Empresa Nacional de Electricidad
               Chile 8.125% due 02/01/97.........        2,042,440
     2,250   Florida Power & Light Co. 7.05% due
               12/01/26..........................        2,111,310
     3,000   Illinois Power Co.
               8.75% due 07/01/21................        3,096,510
     3,000   Indianapolis Power Co.
               7.05% due 02/01/24................        2,807,610
     1,500   Long Island Lighting Co. 9.625% due
               07/01/24..........................        1,530,000
     2,000   Public Service Electric & Gas Co.
               7.00% due 09/01/24................        1,846,520
     2,000   South Carolina Electric & Gas Co.
               7.625% due 06/01/23...............        1,981,900
     1,850   Southern Co Capital Trust Inc. -
               144A**
               8.19% due 02/01/37................        1,855,217
 
<CAPTION>
 PRINCIPAL
 AMOUNT IN
 THOUSANDS                                              VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
 $   2,000   Southwestern Public Service 8.50%
               due 02/15/25......................  $     2,134,860
     5,000   Wisconsin Electric Power Co. 7.125%
               due 03/15/16......................        4,829,200
                                                   ---------------
                                                        28,567,622
                                                   ---------------
 
             TOTAL CORPORATE BONDS
             (IDENTIFIED COST $40,258,137).......       40,688,379
                                                   ---------------
 
             U.S. GOVERNMENT AGENCY (0.3%)
    50,000   Tennessee Valley Authority 8.00% due
               03/31/45 (Identified Cost
               $1,250,000).......................        1,268,750
                                                   ---------------
 
             SHORT-TERM INVESTMENT (0.4%)
             REPURCHASE AGREEMENT
     1,858   The Bank of New York 5.75% due
               07/01/97 (dated 06/30/97; proceeds
               $1,857,859; collateralized by
               $244,909 U.S. Treasury Bill 0.00%
               due 02/05/98 valued at $237,148,
               $756,731 U.S. Treasury Bill 0.00%
               due 12/26/97 valued at $737,760
               and $882,000 U.S. Treasury Note
               6.875% due 07/31/99 valued at
               $919,805) (Identified Cost
               $1,857,562).......................        1,857,562
                                                   ---------------
 
TOTAL INVESTMENTS
  (IDENTIFIED COST
  $321,038,834) (A).........       99.4%   406,167,604
 
CASH AND OTHER ASSETS IN
  EXCESS OF LIABILITIES.....        0.6      2,530,566
                                  -----   ------------
 
NET ASSETS..................      100.0%  $408,698,170
                                  -----   ------------
                                  -----   ------------
 
<FN>
- ---------------------
ADR  American Depository Receipt.
 *   Non-income producing security.
**   Resale is restricted to qualified institutional investors.
(a)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation is $94,671,429 and the
     aggregate gross unrealized depreciation is $9,542,659, resulting in net
     unrealized appreciation of $85,128,770.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - DIVIDEND GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED)
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                              VALUE
- -----------------------------------------------------------------
<C>          <S>                                <C>
             COMMON STOCKS (96.1%)
             AEROSPACE (3.8%)
   624,000   Raytheon Co......................  $      31,824,000
   374,000   United Technologies Corp.........         31,042,000
                                                -----------------
                                                       62,866,000
                                                -----------------
             ALUMINUM (1.9%)
   428,000   Aluminum Co. of America..........         32,260,500
                                                -----------------
             AUTO PARTS (2.0%)
   579,000   TRW, Inc.........................         32,894,437
                                                -----------------
             AUTOMOTIVE (3.8%)
   831,000   Ford Motor Co....................         31,370,250
   560,000   General Motors Corp..............         31,185,000
                                                -----------------
                                                       62,555,250
                                                -----------------
             BANKS (5.7%)
   680,000   Banc One Corp....................         32,937,500
   486,000   BankAmerica Corp.................         31,377,375
   554,000   KeyCorp..........................         30,954,750
                                                -----------------
                                                       95,269,625
                                                -----------------
             BEVERAGES - SOFT DRINKS (1.9%)
   864,000   PepsiCo Inc......................         32,454,000
                                                -----------------
             CHEMICALS (5.8%)
   364,000   Dow Chemical Co..................         31,713,500
   519,000   Eastman Chemical Co..............         32,956,500
   558,000   PPG Industries, Inc..............         32,433,750
                                                -----------------
                                                       97,103,750
                                                -----------------
             COMPUTERS (2.0%)
   366,000   International Business Machines
               Corp...........................         33,008,625
                                                -----------------
             CONGLOMERATES (3.9%)
   330,000   Minnesota Mining & Manufacturing
               Co.............................         33,660,000
   702,000   Tenneco, Inc.....................         31,721,625
                                                -----------------
                                                       65,381,625
                                                -----------------
             COSMETICS (1.9%)
   333,000   Gillette Co......................         31,551,750
                                                -----------------
             DRUGS (5.8%)
   482,000   Abbott Laboratories..............         32,173,500
   410,000   American Home Products Corp......         31,365,000
   406,000   Bristol-Myers Squibb Co..........         32,886,000
                                                -----------------
                                                       96,424,500
                                                -----------------
 
<CAPTION>
 NUMBER OF
  SHARES                                              VALUE
- -----------------------------------------------------------------
<C>          <S>                                <C>
             ELECTRIC - MAJOR (3.9%)
   492,000   General Electric Co..............  $      32,164,500
 1,413,000   Westinghouse Electric Corp.......         32,675,625
                                                -----------------
                                                       64,840,125
                                                -----------------
             FINANCIAL - MISCELLANEOUS (2.0%)
   289,000   Household International, Inc.....         33,939,437
                                                -----------------
             FOODS (3.9%)
   736,000   Quaker Oats Company (The)........         33,028,000
   770,000   Sara Lee Corp....................         32,051,250
                                                -----------------
                                                       65,079,250
                                                -----------------
             HOUSEHOLD PRODUCTS (2.0%)
   230,000   Procter & Gamble Co..............         32,487,500
                                                -----------------
             INSURANCE (2.0%)
   318,500   Aetna Inc........................         32,606,438
                                                -----------------
             METALS & MINING (2.0%)
   389,000   Phelps Dodge Corp................         33,137,938
                                                -----------------
             NATURAL GAS (3.9%)
   713,000   Burlington Resources, Inc........         31,461,125
   592,000   El Paso Natural Gas Co...........         32,560,000
                                                -----------------
                                                       64,021,125
                                                -----------------
             OFFICE EQUIPMENT (1.9%)
   447,000   Pitney Bowes, Inc................         31,066,500
                                                -----------------
             OIL - DOMESTIC (3.9%)
   684,000   Ashland, Inc.....................         31,720,500
   468,000   Atlantic Richfield Co............         32,994,000
                                                -----------------
                                                       64,714,500
                                                -----------------
             OIL INTEGRATED - INTERNATIONAL (6.0%)
   538,000   Exxon Corp.......................         33,087,000
   468,000   Mobil Corp.......................         32,701,500
   616,000   Royal Dutch Petroleum Co. (ADR)
               (Netherlands)..................         33,495,000
                                                -----------------
                                                       99,283,500
                                                -----------------
             PAPER & FOREST PRODUCTS (3.8%)
   646,000   International Paper Co...........         31,371,375
   604,000   Weyerhaeuser Co..................         31,408,000
                                                -----------------
                                                       62,779,375
                                                -----------------
             PHOTOGRAPHY (1.9%)
   409,000   Eastman Kodak Co.................         31,390,750
                                                -----------------
             RAILROADS (2.0%)
   361,000   Burlington Northern Santa Fe
               Corp...........................         32,444,875
                                                -----------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - DIVIDEND GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                              VALUE
- -----------------------------------------------------------------
<C>          <S>                                <C>
             RETAIL - DEPARTMENT STORES (1.9%)
   660,000   May Department Stores
               Co.............................  $      31,185,000
                                                -----------------
             RETAIL - FOOD CHAINS (1.9%)
   649,000   American Stores Co...............         32,044,375
                                                -----------------
             STEEL (2.0%)
   955,000   Timken Co........................         33,962,188
                                                -----------------
             TELECOMMUNICATIONS (5.9%)
   424,000   Bell Atlantic Corp...............         32,171,000
   623,000   Sprint Corp......................         32,785,375
   900,000   U.S. West Communications Group,
               Inc............................         33,918,750
                                                -----------------
                                                       98,875,125
                                                -----------------
             TOBACCO (2.0%)
   743,000   Philip Morris Companies, Inc.....         32,970,625
                                                -----------------
             UTILITIES - ELECTRIC (3.8%)
   680,000   FPL Group, Inc...................         31,322,500
 1,445,000   Unicom Corp......................         32,151,250
                                                -----------------
                                                       63,473,750
                                                -----------------
             UTILITIES - GAS (0.9%)
   271,300   Consolidated Natural
               Gas Co.........................         14,599,330
                                                -----------------
 
             TOTAL COMMON STOCKS
             (IDENTIFIED COST
             $1,139,168,916)..................      1,596,671,768
                                                -----------------
</TABLE>
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN
 THOUSANDS
- -----------
<C>          <S>                                <C>
             U.S. GOVERNMENT OBLIGATIONS (2.2%)
 $   4,000   U.S. Treasury Bond
               8.00% due 11/15/21.............          4,525,600
     5,000   U.S. Treasury Bond
               7.125% due 02/15/23............          5,150,300
    17,000   U.S. Treasury Bond
               6.25% due 08/15/23.............         15,738,600
     7,000   U.S. Treasury Bond
               6.00% due 02/15/26.............          6,265,700
     5,000   U.S. Treasury Note
               6.375% due 01/15/99............          5,029,900
                                                -----------------
 
             TOTAL U.S. GOVERNMENT OBLIGATIONS
             (IDENTIFIED COST $36,992,101)....         36,710,100
                                                -----------------
 
<CAPTION>
 PRINCIPAL
 AMOUNT IN
 THOUSANDS                                            VALUE
- -----------------------------------------------------------------
<C>          <S>                                <C>
 
             SHORT-TERM INVESTMENTS (1.8%)
             U.S. GOVERNMENT AGENCY (a) (1.8%)
 $  29,000   Federal Home Loan Mortgage Corp.
               6.00% due 07/01/97 (Amortized
               Cost $29,000,000)..............  $      29,000,000
                                                -----------------
 
             REPURCHASE AGREEMENT (0.0%)
       601   The Bank of New York 5.75% due
               07/01/97 (dated 06/30/97;
               proceeds $601,430;
               collateralized by $137,097 U.S.
               Treasury Bond 12.75% due
               11/15/10 valued at $192,214 and
               $285,000 U.S. Treasury Note
               7.875% due 08/15/01 valued at
               $308,555 and $108,466 U.S.
               Treasury Note 7.125% due
               09/30/99 valued at $112,591)
               (Identified Cost $601,334).....            601,334
                                                -----------------
 
             TOTAL SHORT-TERM
             INVESTMENTS
             (IDENTIFIED COST
             $29,601,334).....................         29,601,334
                                                -----------------
 
TOTAL INVESTMENTS
  (IDENTIFIED COST
  $1,205,762,351) (B)......      100.1%  1,662,983,202
 
LIABILITIES IN EXCESS OF
  OTHER ASSETS.............       (0.1)     (2,136,861)
                                 -----   -------------
 
NET ASSETS.................      100.0%  $1,660,846,341
                                 -----   -------------
                                 -----   -------------
 
<FN>
- ---------------------
ADR  American Depository Receipt.
(a)  Security was purchased on a discount basis. The interest rate shown has
     been adjusted to reflect a money market equivalent yield.
(b)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation is $461,733,448 and the
     aggregate gross unrealized depreciation is $4,512,597, resulting in net
     unrealized appreciation of $457,220,851.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - CAPITAL GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED)
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
             COMMON STOCKS (96.1%)
             BANKING (3.8%)
    35,200   State Street Corp...................  $     1,628,000
    38,000   Washington Mutual, Inc..............        2,270,500
                                                   ---------------
                                                         3,898,500
                                                   ---------------
             COMMERCIAL SERVICES (1.7%)
    50,000   Affiliated Computer Services, Inc.
               (Class A)*........................        1,400,000
     8,000   Stewart Enterprises, Inc. (Class
               A)................................          334,000
                                                   ---------------
                                                         1,734,000
                                                   ---------------
             COMMUNICATIONS EQUIPMENT (2.9%)
    17,600   3Com Corp.*.........................          790,900
    38,600   Tellabs, Inc.*......................        2,151,950
                                                   ---------------
                                                         2,942,850
                                                   ---------------
             COMPUTER SERVICES (2.1%)
    65,000   Sterling Commerce, Inc.*............        2,136,875
                                                   ---------------
             COMPUTER SOFTWARE (6.0%)
    30,000   Computer Associates International,
               Inc...............................        1,670,625
    26,000   Danka Business Systems PLC (ADR)
               (United Kingdom)..................        1,056,250
    13,500   Microsoft Corp.*....................        1,706,906
    33,000   Oracle Corp.*.......................        1,660,312
                                                   ---------------
                                                         6,094,093
                                                   ---------------
             COMPUTERS - SYSTEMS (5.6%)
    15,000   COMPAQ Computer Corp.*..............        1,488,750
    75,000   EMC Corp.*..........................        2,925,000
    21,000   SCI Systems, Inc.*..................        1,338,750
                                                   ---------------
                                                         5,752,500
                                                   ---------------
             CONSUMER SERVICES (1.8%)
    15,000   AccuStaff, Inc.*....................          355,312
    45,000   Service Corp. International.........        1,479,375
                                                   ---------------
                                                         1,834,687
                                                   ---------------
             DRUGS (2.9%)
    30,000   Abbott Laboratories.................        2,002,500
    20,000   Elan Corp. PLC (ADR) (Ireland)*.....          905,000
                                                   ---------------
                                                         2,907,500
                                                   ---------------
             ELECTRONICS (4.6%)
    22,000   Dionex Corp.*.......................        1,122,000
    19,000   Hadco Corp*.........................        1,235,000
    28,000   Jabil Circuit, Inc.*................        2,334,500
                                                   ---------------
                                                         4,691,500
                                                   ---------------
 
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
             ENVIRONMENTAL CONTROL (2.1%)
    35,000   Newpark Resources, Inc.*............  $     1,181,250
    24,000   United Waste Systems, Inc.*.........          981,000
                                                   ---------------
                                                         2,162,250
                                                   ---------------
             FINANCIAL - MISCELLANEOUS (11.9%)
    40,500   Fannie Mae..........................        1,766,813
    80,000   Green Tree Financial Corp...........        2,850,000
    20,000   Household International, Inc........        2,348,750
    70,000   MBNA Corp...........................        2,563,750
    54,600   MGIC Investment Corp................        2,617,388
                                                   ---------------
                                                        12,146,701
                                                   ---------------
             FINANCIAL SERVICES (2.3%)
    48,000   SunAmerica, Inc.....................        2,340,000
                                                   ---------------
             HEALTHCARE - DIVERSIFIED (5.8%)
   115,000   General Nutrition Companies,
               Inc.*.............................        3,205,625
    70,000   Universal Health Services, Inc.
               (Class B)*........................        2,695,000
                                                   ---------------
                                                         5,900,625
                                                   ---------------
             HOSPITAL MANAGEMENT (1.0%)
    25,000   Express Scripts, Inc. (Class A)*....        1,034,375
                                                   ---------------
             HOUSEHOLD FURNISHINGS & APPLIANCES (0.7%)
    13,000   Ethan Allen Interiors, Inc..........          741,000
                                                   ---------------
             HOUSEHOLD APPLIANCES (0.9%)
    20,000   American Standard Companies,
               Inc.*.............................          895,000
                                                   ---------------
             MANUFACTURING - DIVERSIFIED (1.9%)
    28,000   Tyco International Ltd..............        1,947,750
                                                   ---------------
             MEDIA GROUP (3.3%)
    54,000   Clear Channel Communications,
               Inc.*.............................        3,321,000
                                                   ---------------
             METALS & MINING (0.9%)
    60,000   Miller Industries, Inc.*............          960,000
                                                   ---------------
             OFFICE EQUIPMENT & SUPPLIES (2.6%)
   115,000   Staples, Inc.*......................        2,659,375
                                                   ---------------
             OIL DRILLING & SERVICES (6.8%)
    45,000   ENSCO International, Inc.*..........        2,373,750
   105,000   Pride Petroleum Services, Inc.*.....        2,513,438
    47,700   Tidewater, Inc......................        2,098,800
                                                   ---------------
                                                         6,985,988
                                                   ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - CAPITAL GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
             OIL EQUIPMENT & SERVICES (6.0%)
    24,000   Falcon Drilling
               Company, Inc.*....................  $     1,383,000
    30,000   Lomak Petroleum, Inc................          534,375
    36,000   Smith International, Inc.*..........        2,187,000
    63,000   Varco International, Inc.*..........        2,031,750
                                                   ---------------
                                                         6,136,125
                                                   ---------------
             PHARMACEUTICALS (2.9%)
    60,000   Medicis Pharmaceutical Corp. (Class
               A)*...............................        2,985,000
                                                   ---------------
             POLLUTION CONTROL (2.0%)
    75,000   US Filter Corp.*....................        2,043,750
                                                   ---------------
             RETAIL - DEPARTMENT STORES (2.8%)
    75,000   Dollar General Corp.................        2,812,500
                                                   ---------------
             RETAIL - DRUG STORES (1.9%)
    36,000   Walgreen Co.........................        1,930,500
                                                   ---------------
             RETAIL - FOOD CHAINS (5.2%)
    90,000   Kroger Co.*.........................        2,610,000
    58,800   Safeway, Inc.*......................        2,712,150
                                                   ---------------
                                                         5,322,150
                                                   ---------------
             RETAIL - SPECIALTY (1.3%)
    37,500   Consolidated Stores Corp.*..........        1,303,125
                                                   ---------------
             UTILITIES - ELECTRIC (2.4%)
    34,000   AES Corp.*..........................        2,405,500
                                                   ---------------
 
             TOTAL COMMON STOCKS
             (IDENTIFIED COST $78,780,052).......       98,025,219
                                                   ---------------
</TABLE>
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN
 THOUSANDS
- -----------
<C>          <S>                                   <C>
             SHORT-TERM INVESTMENTS (5.2%)
             U.S. GOVERNMENT AGENCY (a) (4.4%)
 $   4,500   Federal Home Loan Mortgage Corp.
               6.00% due 07/01/97 (Amortized Cost
               $4,500,000).......................        4,500,000
                                                   ---------------
 
<CAPTION>
 PRINCIPAL
 AMOUNT IN
 THOUSANDS                                              VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
 
             REPURCHASE AGREEMENT (0.8%)
 $     826   The Bank of New York 5.75% due
               07/01/97 (dated 06/30/97; proceeds
               $825,716; collateralized by
               $377,861 U.S. Treasury Bond 8.25%
               due 05/15/05 valued at $398,939;
               $383,000 U.S. Treasury Bond 7.25%
               due 05/15/16 valued at $402,329;
               and $38,158 U.S. Treasury Note
               9.25% due 08/15/98 valued at
               $40,828) (Identified Cost
               $825,584).........................  $       825,584
                                                   ---------------
 
             TOTAL SHORT-TERM INVESTMENTS
             (IDENTIFIED COST $5,325,584)........        5,325,584
                                                   ---------------
 
TOTAL INVESTMENTS
  (IDENTIFIED COST
  $84,105,636) (B)..........      101.3%   103,350,803
 
LIABILITIES IN EXCESS OF
  OTHER ASSETS..............       (1.3)    (1,347,150)
                                  -----   ------------
 
NET ASSETS..................      100.0%  $102,003,653
                                  -----   ------------
                                  -----   ------------
 
<FN>
- ---------------------
 *   Non-income producing security.
ADR  American Depository Receipt.
(a)  Security was purchased on a discount basis. The interest rate shown has
     been adjusted to reflect a money market equivalent yield.
(b)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation is $19,803,994 and the
     aggregate gross unrealized depreciation is $558,827, resulting in net
     unrealized appreciation of $19,245,167.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - GLOBAL DIVIDEND GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED)
<TABLE>
<CAPTION>
  NUMBER OF
   SHARES                                               VALUE
- ------------------------------------------------------------------
<C>            <S>                                 <C>
               COMMON AND PREFERRED STOCKS (96.8%)
               AUSTRALIA (1.5%)
               BANKING
      305,000  Australia & New Zealand Banking
                 Group Ltd.......................  $     2,275,797
                                                   ---------------
               BUILDING & CONSTRUCTION
      602,000  Pioneer International Ltd.........        2,323,085
                                                   ---------------
               PAPER & FOREST PRODUCTS
      336,000  Amcor Ltd.........................        2,228,540
                                                   ---------------
               TOTAL AUSTRALIA...................        6,827,422
                                                   ---------------
               CANADA (2.9%)
               BANKS - COMMERCIAL
       84,800  Toronto Dominion Bank.............        2,512,911
                                                   ---------------
               NATURAL GAS
       81,900  IPL Energy, Inc...................        2,738,505
      125,000  TransCanada Pipelines Ltd.........        2,513,223
                                                   ---------------
                                                         5,251,728
                                                   ---------------
               OIL RELATED
       49,000  Imperial Oil Ltd..................        2,511,774
                                                   ---------------
               TELECOMMUNICATIONS
       93,600  BCE, Inc..........................        2,604,144
                                                   ---------------
 
               TOTAL CANADA......................       12,880,557
                                                   ---------------
               FRANCE (6.8%)
               BANKING
       23,900  Societe Generale..................        2,666,893
                                                   ---------------
               BUILDING & CONSTRUCTION
       40,000  Lafarge S.A.......................        2,486,860
                                                   ---------------
               FINANCIAL SERVICES
        6,200  Societe Eurafrance S.A............        2,541,632
                                                   ---------------
               FOODS & BEVERAGES
       17,200  Eridania Beghin-Say S.A...........        2,574,631
                                                   ---------------
               MISCELLANEOUS MATERIALS & COMMODITIES
       18,500  Compagnie de Saint Gobain.........        2,696,848
                                                   ---------------
 
<CAPTION>
  NUMBER OF
   SHARES                                               VALUE
- ------------------------------------------------------------------
<C>            <S>                                 <C>
 
               MULTI-INDUSTRY
        9,300  Compagnie Generale d'Industrie et
                 de Participations...............  $     2,641,821
       64,961  Worms et Compagnie................        3,845,350
                                                   ---------------
                                                         6,487,171
                                                   ---------------
               OIL INTEGRATED - INTERNATIONAL
       24,400  Elf Aquitaine S.A.................        2,631,377
       27,700  Total S.A. (B Shares).............        2,798,789
                                                   ---------------
                                                         5,430,166
                                                   ---------------
               TELECOMMUNICATIONS
       21,300  Alcatel Alsthom...................        2,666,621
                                                   ---------------
               TELEVISION
       27,000  Societe Television Francaise 1....        2,411,165
                                                   ---------------
 
               TOTAL FRANCE......................       29,961,987
                                                   ---------------
 
               GERMANY (6.5%)
               BANKING
       74,500  Commerzbank AG....................        2,109,659
                                                   ---------------
               BUILDING & CONSTRUCTION
       49,000  Bilfinger & Berger Bau AG.........        1,994,268
                                                   ---------------
               CHEMICALS
       57,000  BASF AG...........................        2,105,847
       57,000  Bayer AG..........................        2,189,819
                                                   ---------------
                                                         4,295,666
                                                   ---------------
               ELECTRICAL EQUIPMENT
       37,300  Siemens AG........................        2,214,053
                                                   ---------------
               HEALTH & PERSONAL CARE
       51,000  Douglas Holding AG................        2,031,814
                                                   ---------------
               MACHINERY - DIVERSIFIED
        7,200  M.A.N. AG.........................        2,216,337
                                                   ---------------
               MULTI-INDUSTRY
        7,000  Preussag AG.......................        2,048,438
       49,900  RWE AG............................        2,145,314
        4,500  Viag AG...........................        2,045,572
                                                   ---------------
                                                         6,239,324
                                                   ---------------
               RETAIL - DEPARTMENT STORES
        5,800  Karstadt AG.......................        2,064,660
                                                   ---------------
               STEEL & IRON
        8,500  Thyssen AG........................        2,012,324
                                                   ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - GLOBAL DIVIDEND GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
<TABLE>
<CAPTION>
  NUMBER OF
   SHARES                                               VALUE
- ------------------------------------------------------------------
<C>            <S>                                 <C>
               TEXTILES - APPAREL
        1,150  Hugo Boss AG (Pref.)..............  $     1,384,351
                                                   ---------------
               UTILITIES - ELECTRIC
       37,800  VEBA AG...........................        2,123,474
                                                   ---------------
               TOTAL GERMANY.....................       28,685,930
                                                   ---------------
               HONG KONG (4.0%)
               BANKING
      118,500  HSBC Holdings PLC.................        3,564,255
                                                   ---------------
               CONGLOMERATES
      396,000  Swire Pacific Ltd. (Class A)......        3,565,610
                                                   ---------------
               REAL ESTATE
      351,000  Cheung Kong (Holdings) Ltd........        3,466,275
                                                   ---------------
               TELECOMMUNICATIONS
    1,558,800  Hong Kong Telecommunications
                 Ltd.............................        3,722,688
                                                   ---------------
               UTILITIES - ELECTRIC
      859,000  Hong Kong Electric Holdings
                 Ltd.............................        3,459,730
                                                   ---------------
               TOTAL HONG KONG...................       17,778,558
                                                   ---------------
               ITALY (4.0%)
               FINANCIAL SERVICES
      372,000  Istituto Mobiliare Italiano SpA...        3,354,116
                                                   ---------------
               OIL & GAS PRODUCTS
      640,000  Ente Nazionale Idrocarburi SpA....        3,630,149
                                                   ---------------
               TELECOMMUNICATIONS
      600,000  Sirti SpA.........................        3,466,910
    1,720,000  Telecom Italia SpA................        3,410,808
                                                   ---------------
                                                         6,877,718
                                                   ---------------
               TEXTILES - APPAREL
      231,920  Benetton Group SpA................        3,710,666
                                                   ---------------
               TOTAL ITALY.......................       17,572,649
                                                   ---------------
 
<CAPTION>
  NUMBER OF
   SHARES                                               VALUE
- ------------------------------------------------------------------
<C>            <S>                                 <C>
 
               JAPAN (24.4%)
               AUTOMOTIVE
      186,000  Honda Motor Co....................  $     5,599,476
      181,000  Toyota Motor Corp.................        5,338,394
                                                   ---------------
                                                        10,937,870
                                                   ---------------
               BREWERS
      526,000  Kirin Brewery Co., Ltd............        5,461,955
                                                   ---------------
               BUILDING & CONSTRUCTION
      540,000  Sekisui House Ltd.................        5,465,969
                                                   ---------------
               COMPUTER SERVICES
      583,000  NCR Japan Limited.................        4,527,661
                                                   ---------------
               ELECTRONICS & ELECTRICAL
      475,000  Hitachi, Ltd......................        5,305,410
       69,000  Kyocera Corp......................        5,479,058
      271,000  Matsushita Electric Industrial
                 Co., Ltd........................        5,462,565
      487,000  Matsushita Electric Works.........        5,524,433
      941,000  Mitsubishi Electric Corp..........        5,263,359
      367,000  NEC Corp..........................        5,123,909
      400,000  Sharp Corp........................        5,514,834
       62,000  Sony Corp.........................        5,404,712
       75,000  TDK Corp..........................        5,503,927
                                                   ---------------
                                                        48,582,207
                                                   ---------------
               ENTERTAINMENT & LEISURE TIME
       64,000  Nintendo Co., Ltd.................        5,350,087
                                                   ---------------
               MACHINERY - DIVERSIFIED
      713,000  Mitsubishi Heavy Industries,
                 Ltd.............................        5,468,822
                                                   ---------------
               PHARMACEUTICALS
      207,000  Taisho Pharmaceutical Co., Ltd....        5,581,414
      195,000  Takeda Chemical Industries........        5,479,058
                                                   ---------------
                                                        11,060,472
                                                   ---------------
               TOBACCO
          690  Japan Tobacco, Inc................        5,448,953
                                                   ---------------
               TRANSPORTATION
      442,000  Yamato Transport Co.
                 Ltd.............................        5,515,358
                                                   ---------------
 
               TOTAL JAPAN.......................      107,819,354
                                                   ---------------
 
               MALAYSIA (1.4%)
               BANKING
      330,000  AMMB Holdings Berhad..............        2,052,694
                                                   ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - GLOBAL DIVIDEND GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
<TABLE>
<CAPTION>
  NUMBER OF
   SHARES                                               VALUE
- ------------------------------------------------------------------
<C>            <S>                                 <C>
               BUILDING & CONSTRUCTION
      285,000  United Engineers (Malaysia)
                 Berhad..........................  $     2,055,072
                                                   ---------------
               CONGLOMERATES
      635,000  Sime Darby Berhad.................        2,113,312
                                                   ---------------
               TOTAL MALAYSIA....................        6,221,078
                                                   ---------------
 
               NETHERLANDS (3.0%)
               APPLIANCES & HOUSEHOLD DURABLES
       24,900  Philips Electronics NV............        1,782,556
                                                   ---------------
               BANKING
       80,800  ABN-AMRO Holding NV...............        1,505,743
                                                   ---------------
               CHEMICALS
       16,500  DSM NV............................        1,640,759
                                                   ---------------
               INSURANCE
       36,950  Fortis Amev NV....................        1,644,313
                                                   ---------------
               METALS
       31,000  Koninklijke Hoogovens NV..........        1,726,782
                                                   ---------------
               OIL
       30,400  Royal Dutch Petroleum Co..........        1,580,366
                                                   ---------------
               TELECOMMUNICATIONS
       41,700  Koninklijke PTT Nederland NV......        1,634,878
                                                   ---------------
               TRANSPORTATION
       55,500  KLM Royal Dutch Air Lines NV......        1,709,649
                                                   ---------------
               TOTAL NETHERLANDS.................       13,225,046
                                                   ---------------
               SPAIN (0.7%)
               OIL RELATED
       26,000  Repsol S.A........................        1,098,170
                                                   ---------------
               UTILITIES - ELECTRIC
       25,000  Empresa Nacional de Electricidad,
                 S.A.............................        2,096,610
                                                   ---------------
 
               TOTAL SPAIN.......................        3,194,780
                                                   ---------------
               SWITZERLAND (2.0%)
               BANKING
       11,400  Swiss Bank Corp...................        3,047,022
                                                   ---------------
 
<CAPTION>
  NUMBER OF
   SHARES                                               VALUE
- ------------------------------------------------------------------
<C>            <S>                                 <C>
               FOODS & BEVERAGES
        2,290  Nestle S.A........................  $     3,018,850
                                                   ---------------
               PHARMACEUTICALS
        1,860  Novartis AG-Bearer................        2,968,871
                                                   ---------------
 
               TOTAL SWITZERLAND.................        9,034,743
                                                   ---------------
 
               UNITED KINGDOM (9.9%)
               BANKING
      208,000  National Westminster Bank PLC.....        2,794,854
      282,000  Royal Bank of Scotland Group
                 PLC.............................        2,637,174
                                                   ---------------
                                                         5,432,028
                                                   ---------------
               BREWERS
      224,000  Bass PLC..........................        2,732,155
                                                   ---------------
               ENERGY
      135,000  Energy Group PLC..................        1,439,942
                                                   ---------------
               FOODS & BEVERAGES
      945,000  Hillsdown Holdings PLC............        2,665,354
                                                   ---------------
               LEISURE
      425,000  Rank Group PLC....................        2,690,896
                                                   ---------------
               MULTI-INDUSTRY
      235,000  Hanson PLC........................        1,165,299
                                                   ---------------
               NATURAL GAS
      740,000  BG PLC............................        2,708,992
                                                   ---------------
               RETAIL - MERCHANDISING
      445,000  Tesco PLC.........................        2,747,181
                                                   ---------------
               STEEL & IRON
    1,070,000  British Steel PLC.................        2,661,818
                                                   ---------------
               TELECOMMUNICATIONS
      352,000  British Telecommunications PLC....        2,612,347
                                                   ---------------
               TOBACCO
      308,000  B.A.T. Industries PLC.............        2,754,752
                                                   ---------------
               UTILITIES - ELECTRIC
      731,000  National Grid Group PLC...........        2,639,553
      325,000  National Power PLC................        2,822,976
      407,000  Scottish Hydro-Electric PLC.......        2,810,579
                                                   ---------------
                                                         8,273,108
                                                   ---------------
               UTILITIES - WATER
      210,000  Hyder PLC.........................        2,830,464
      121,500  Hyder PLC (Pref.).................          215,317
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - GLOBAL DIVIDEND GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
<TABLE>
<CAPTION>
  NUMBER OF
   SHARES                                               VALUE
- ------------------------------------------------------------------
<C>            <S>                                 <C>
      219,000  Severn Trent PLC..................  $     2,838,801
                                                   ---------------
                                                         5,884,582
                                                   ---------------
               TOTAL UNITED KINGDOM..............       43,768,454
                                                   ---------------
               UNITED STATES (29.7%)
               AEROSPACE & DEFENSE
       75,000  Northrop Grumman Corp.............        6,585,937
                                                   ---------------
               AUTOMOTIVE
      167,500  Ford Motor Co.....................        6,323,125
                                                   ---------------
               BANKS
       99,000  BankAmerica Corp..................        6,391,687
      118,500  KeyCorp...........................        6,621,187
                                                   ---------------
                                                        13,012,874
                                                   ---------------
               CHEMICALS
       74,000  Dow Chemical Co...................        6,447,250
                                                   ---------------
               COMPUTERS - SYSTEMS
       72,500  International Business Machines
                 Corp............................        6,538,594
                                                   ---------------
               CONGLOMERATES
       65,100  Minnesota Mining & Manufacturing
                 Co..............................        6,640,200
      148,700  Tenneco, Inc......................        6,719,381
                                                   ---------------
                                                        13,359,581
                                                   ---------------
               MACHINERY - DIVERSIFIED
      119,500  Deere & Co........................        6,557,562
                                                   ---------------
               METALS & MINING
       79,100  Phelps Dodge Corp.................        6,738,331
                                                   ---------------
               OIL - DOMESTIC
      143,700  Ashland, Inc......................        6,664,088
                                                   ---------------
               OIL INTEGRATED - INTERNATIONAL
       87,900  Chevron Corp......................        6,499,106
                                                   ---------------
               PAPER & FOREST PRODUCTS
      132,000  International Paper Co............        6,410,250
                                                   ---------------
               PHARMACEUTICALS
       81,200  Bristol-Myers Squibb Co...........        6,577,200
                                                   ---------------
               RETAIL
      125,000  Dayton-Hudson Corp................        6,648,438
                                                   ---------------
               TELECOMMUNICATIONS
      183,900  AT&T Corp.........................        6,447,994
      129,700  Sprint Corp.......................        6,825,463
                                                   ---------------
                                                        13,273,457
                                                   ---------------
 
<CAPTION>
  NUMBER OF
   SHARES                                               VALUE
- ------------------------------------------------------------------
<C>            <S>                                 <C>
               TIRE & RUBBER GOODS
      107,200  Goodyear Tire & Rubber Co.........  $     6,787,100
                                                   ---------------
               TOBACCO
      152,300  Philip Morris Companies, Inc......        6,758,313
                                                   ---------------
               UTILITIES - ELECTRIC
      180,000  GPU, Inc..........................        6,457,500
                                                   ---------------
 
               TOTAL UNITED STATES...............      131,638,706
                                                   ---------------
 
               TOTAL COMMON AND PREFERRED STOCKS
               (IDENTIFIED COST $353,573,570)....      428,609,264
                                                   ---------------
</TABLE>
 
<TABLE>
<CAPTION>
  PRINCIPAL
  AMOUNT IN
  THOUSANDS
- -------------
<C>            <S>                                 <C>
               SHORT-TERM INVESTMENT (a) (3.7%)
               U.S. GOVERNMENT AGENCY
$      16,500  Federal Home Loan Mortgage Corp.
                 6.00% due 07/01/97 (Amortized
                 Cost $16,500,000)...............       16,500,000
                                                   ---------------
 
TOTAL INVESTMENTS
  (IDENTIFIED COST
  $370,073,570) (B).........      100.5%   445,109,264
 
LIABILITIES IN EXCESS OF
CASH
  AND OTHER ASSETS..........       (0.5)    (2,150,592)
                                  -----   ------------
 
NET ASSETS..................      100.0%  $442,958,672
                                  -----   ------------
                                  -----   ------------
 
<FN>
- ---------------------
(a)  Security was purchased on a discount basis. The interest rate shown has
     been adjusted to reflect a money market equivalent yield.
(b)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation is $78,819,776 and the
     aggregate gross unrealized depreciation is $3,784,082, resulting in net
     unrealized appreciation of $75,035,694.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - GLOBAL DIVIDEND GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
FORWARD FOREIGN CURRENCY CONTRACTS OPEN AT JUNE 30, 1997:
 
<TABLE>
<CAPTION>
                                                       UNREALIZED
     CONTRACTS           IN EXCHANGE      DELIVERY    APPRECIATION
    TO RECEIVE               FOR            DATE     (DEPRECIATION)
- -------------------------------------------------------------------
<S>                  <C>                  <C>        <C>
    $       117,449       Y   13,469,014  07/01/97   $        (82)
    L       227,784       $      379,454  07/01/97           (421)
    $       232,320      ITL 391,495,935  07/01/97          1,607
    ESP 179,264,100      $     1,223,395  07/01/97         (8,045)
    Y    23,366,904       $      204,453  07/02/97           (553)
    $        96,420        CHF   140,869  07/02/97             --
    L       109,058       $      181,857  07/02/97           (384)
    ESP 164,611,824      $     1,118,591  07/03/97         (2,579)
    Y    73,867,962       $      645,851  07/03/97         (1,279)
    L       113,564       $      188,849  07/03/97            123
      DEM   336,500       $      193,150  07/03/97           (258)
    L        33,880       $       64,758  07/03/97            (61)
    $        72,128        HKD   558,880  07/07/97            (19)
    $       112,676        FRF   656,043  07/31/97          1,083
    $       226,920       FRF  1,328,120  07/31/97          1,007
    $        60,112        FRF   352,626  07/31/97            130
                                                          -------
      Net unrealized depreciation..................  $     (9,731)
                                                          -------
                                                          -------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - GLOBAL DIVIDEND GROWTH
SUMMARY OF INVESTMENTS JUNE 30, 1997 (UNAUDITED)
<TABLE>
<CAPTION>
                                                        PERCENT OF
INDUSTRY                                     VALUE      NET ASSETS
- ------------------------------------------------------------------
<S>                                       <C>           <C>
Aerospace & Defense.....................  $  6,585,937      1.5%
Appliances & Household Durables.........     1,782,556      0.4
Automotive..............................    17,260,995      3.9
Banking.................................    22,654,091      5.1
Banks...................................    13,012,874      2.9
Banks - Commercial......................     2,512,911      0.6
Brewers.................................     8,194,110      1.8
Building & Construction.................    14,325,254      3.2
Chemicals...............................    12,383,675      2.8
Computer Services.......................     4,527,661      1.0
Computers - Systems.....................     6,538,594      1.5
Conglomerates...........................    19,038,503      4.3
Electrical Equipment....................     2,214,053      0.5
Electronics & Electrical................    48,582,207     11.0
Energy..................................     1,439,942      0.3
Entertainment & Leisure Time............     5,350,087      1.2
Financial Services......................     5,895,748      1.3
Foods & Beverages.......................     8,258,835      1.9
Health & Personal Care..................     2,031,814      0.5
Insurance...............................     1,644,313      0.4
Leisure.................................     2,690,896      0.6
Machinery - Diversified.................    14,242,721      3.2
Metals..................................     1,726,782      0.4
Metals & Mining.........................     6,738,331      1.5
Miscellaneous Materials & Commodities...     2,696,848      0.6
Multi-Industry..........................    13,891,794      3.1
Natural Gas.............................     7,960,720      1.8
Oil.....................................     1,580,366      0.4
 
<CAPTION>
                                                        PERCENT OF
INDUSTRY                                     VALUE      NET ASSETS
- ------------------------------------------------------------------
<S>                                       <C>           <C>
Oil & Gas Products......................  $  3,630,149      0.8%
Oil - Domestic..........................     6,664,088      1.5
Oil Integrated - International..........    11,929,272      2.7
Oil Related.............................     3,609,944      0.8
Paper & Forest Products.................     8,638,790      2.0
Pharmaceuticals.........................    20,606,543      4.7
Real Estate.............................     3,466,275      0.8
Retail..................................     6,648,438      1.5
Retail - Department Stores..............     2,064,660      0.5
Retail - Merchandising..................     2,747,181      0.6
Steel & Iron............................     4,674,142      1.1
Telecommunications......................    33,391,853      7.5
Television..............................     2,411,165      0.5
Textiles - Apparel......................     5,095,017      1.2
Tire & Rubber Goods.....................     6,787,100      1.5
Tobacco.................................    14,962,018      3.4
Transportation..........................     7,225,007      1.6
U.S. Government Agency..................    16,500,000      3.7
Utilities - Electric....................    22,410,422      5.1
Utilities - Water.......................     5,884,582      1.3
                                          ------------    -----
                                          $445,109,264    100.5%
                                          ------------    -----
                                          ------------    -----
</TABLE>
 
<TABLE>
<CAPTION>
                                                        PERCENT OF
TYPE OF INVESTMENT                           VALUE      NET ASSETS
- ------------------------------------------------------------------
<S>                                       <C>           <C>
Common Stocks...........................  $427,009,596     96.4%
Preferred Stocks........................     1,599,668      0.4
Short-Term Investment...................    16,500,000      3.7
                                          ------------    -----
                                          $445,109,264    100.5%
                                          ------------    -----
                                          ------------    -----
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - EUROPEAN GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED)
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                               VALUE
- -----------------------------------------------------------------
<C>          <S>                                  <C>
             COMMON AND PREFERRED STOCKS (97.4%)
             BELGIUM (0.3%)
             RETAIL
    21,389   G.I.B. Holdings Ltd................  $     1,021,891
                                                  ---------------
 
             DENMARK (2.2%)
             AIR TRANSPORT
    33,093   Kobenhavns Lufthavne AS............        3,510,332
                                                  ---------------
             PHARMACEUTICALS
    44,800   Novo-Nordisk AS (Series B).........        4,884,378
                                                  ---------------
 
             TOTAL DENMARK......................        8,394,710
                                                  ---------------
             FINLAND (1.1%)
             MACHINERY
     4,791   Rauma Oy...........................          109,697
                                                  ---------------
             PAPER PRODUCTS
   182,000   UPM-Kymmene Oy.....................        4,202,182
                                                  ---------------
             TOTAL FINLAND......................        4,311,879
                                                  ---------------
 
             FRANCE (14.4%)
             BANKING
   108,450   Banque Nationale de Paris..........        4,467,943
                                                  ---------------
             BUILDING MATERIALS
    16,630   IMETAL S.A.........................        2,203,604
                                                  ---------------
             ELECTRICAL EQUIPMENT
    38,750   Alcatel Alsthom....................        4,851,248
                                                  ---------------
             ELECTRONICS - SEMICONDUCTORS
    62,300   SGS-Thomson Microelectronics NV*...        4,917,110
                                                  ---------------
             FINANCIAL SERVICES
    27,250   Cetelem Groupe.....................        3,425,428
                                                  ---------------
             FOOD, BEVERAGE, TOBACCO & HOUSEHOLD PRODUCTS
   112,000   SEITA..............................        3,543,520
    17,895   Societe BIC S.A....................        2,925,223
                                                  ---------------
                                                        6,468,743
                                                  ---------------
             INSURANCE
    89,100   AXA................................        5,539,480
    18,922   Scor...............................          761,528
                                                  ---------------
                                                        6,301,008
                                                  ---------------
             OIL RELATED
    42,700   Elf Aquitaine S.A..................        4,604,909
    42,000   Total S.A. (B Shares)..............        4,243,651
                                                  ---------------
                                                        8,848,560
                                                  ---------------
 
<CAPTION>
 NUMBER OF
  SHARES                                               VALUE
- -----------------------------------------------------------------
<C>          <S>                                  <C>
             RETAIL
     4,646   Carrefour Supermarche..............  $     3,372,932
                                                  ---------------
             STEEL & IRON
   303,790   Usinor Sacilor.....................        5,477,511
                                                  ---------------
             TIRE & RUBBER GOODS
    59,700   Michelin (B Shares)................        3,583,686
                                                  ---------------
 
             TOTAL FRANCE.......................       53,917,773
                                                  ---------------
             GERMANY (8.9%)
             AUTOMOTIVE
     6,045   Bayerische Motoren Werke (BMW)
               AG...............................        5,000,249
    12,770   Volkswagen AG......................        9,787,039
                                                  ---------------
                                                       14,787,288
                                                  ---------------
             CHEMICALS
    89,000   BASF AG............................        3,288,077
    82,800   Hoechst AG.........................        3,511,347
    28,490   SGL Carbon AG......................        3,899,921
                                                  ---------------
                                                       10,699,345
                                                  ---------------
             HEALTH & PERSONAL CARE
        81   Rhoen-Klinikum AG..................           10,679
       103   Rhoen-Klinikum AG (Pref.)..........           13,167
                                                  ---------------
                                                           23,846
                                                  ---------------
             PHARMACEUTICALS
    30,500   Gehe AG............................        2,080,539
                                                  ---------------
             RETAIL - SPECIALTY APPAREL
    18,475   Adidas AG..........................        2,043,952
                                                  ---------------
             UTILITIES
    68,400   VEBA AG............................        3,842,476
                                                  ---------------
             TOTAL GERMANY......................       33,477,446
                                                  ---------------
             ITALY (4.8%)
             HOUSEHOLD FURNISHINGS & APPLIANCES
   116,400   Industrie Natuzzi SpA (ADR)........        2,982,750
                                                  ---------------
             OIL & GAS PRODUCTS
   614,550   Ente Nazionale Idrocarburi SpA.....        3,485,794
                                                  ---------------
             RETAIL - SPECIALTY APPAREL
    15,000   Fila Holding SpA (ADR).............          501,562
                                                  ---------------
             TELECOMMUNICATIONS
 1,070,000   Stet Societa Finanziaria Telefonica
               SpA..............................        6,242,560
 1,465,850   Telecom Italia Mobile SpA..........        4,751,120
                                                  ---------------
                                                       10,993,680
                                                  ---------------
             TOTAL ITALY........................       17,963,786
                                                  ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - EUROPEAN GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                               VALUE
- -----------------------------------------------------------------
<C>          <S>                                  <C>
             NETHERLANDS (12.1%)
             CHEMICALS
    30,560   Akzo Nobel NV......................  $     4,185,662
                                                  ---------------
             ELECTRICAL EQUIPMENT
    95,000   Philips Electronics NV.............        6,800,917
                                                  ---------------
             ELECTRONICS - SEMICONDUCTORS
    50,600   ASM Lithography Holding NV*........        2,924,185
                                                  ---------------
             INSURANCE
    63,639   Aegon NV...........................        4,439,177
   125,698   ING Groep NV.......................        5,792,092
                                                  ---------------
                                                       10,231,269
                                                  ---------------
             MERCHANDISING
    37,600   Gucci Group NV.....................        2,450,509
                                                  ---------------
             PUBLISHING
   121,500   Elsevier NV........................        2,029,124
   241,000   Ver Ned Uitgev Ver
               Bezit NV.........................        5,325,560
    27,143   Wolters Kluwer NV..................        3,303,043
                                                  ---------------
                                                       10,657,727
                                                  ---------------
             RECORD & TAPE DISTRIBUTION
    40,500   PolyGram NV........................        2,123,982
                                                  ---------------
             RETAIL
    70,895   Koninklijke Ahold NV...............        5,977,705
                                                  ---------------
 
             TOTAL NETHERLANDS..................       45,351,956
                                                  ---------------
             SPAIN (6.6%)
             BANKS
    85,986   Banco Bilbao Vizcaya S.A...........        6,977,983
    22,031   Banco Popular Espanol S.A..........        5,391,994
                                                  ---------------
                                                       12,369,977
                                                  ---------------
             MISCELLANEOUS
    28,160   Corporacion Financiera Alba........        3,568,206
                                                  ---------------
             TELECOMMUNICATIONS
   221,855   Telefonica de Espana S.A...........        6,407,473
                                                  ---------------
             UTILITIES - ELECTRIC
    27,800   Empresa Nacional de Electricidad
               S.A. (Endesa)....................        2,331,430
                                                  ---------------
             TOTAL SPAIN........................       24,677,086
                                                  ---------------
 
<CAPTION>
 NUMBER OF
  SHARES                                               VALUE
- -----------------------------------------------------------------
<C>          <S>                                  <C>
 
             SWEDEN (8.2%)
             AUTO TRUCKS & PARTS
    57,000   Scania AB (A Shares)...............  $     1,735,441
    80,000   Scania AB (B Shares)...............        2,446,071
                                                  ---------------
                                                        4,181,512
                                                  ---------------
             BUSINESS SERVICES
   100,000   Assa Abloy AB (Series B)...........        2,047,030
    10,000   Assa Abloy AB
               Rfd 01/01/97*....................          200,816
   119,000   Securitas AB
               (Series "B" Free)................        3,361,016
                                                  ---------------
                                                        5,608,862
                                                  ---------------
             INSURANCE
   129,181   Scandia Forsakrings AB.............        4,769,915
                                                  ---------------
             PAPER PRODUCTS
   145,000   Stora Kopparbergs Bergslags
               Aktiebolag (A Shares)............        2,348,254
                                                  ---------------
             PHARMACEUTICALS
   105,600   Astra AB (A Shares)................        1,970,124
   202,667   Astra AB (B Shares)................        3,610,373
                                                  ---------------
                                                        5,580,497
                                                  ---------------
             RETAIL
    74,900   Hennes & Mauritz AB (B Shares).....        2,687,996
                                                  ---------------
             TELECOMMUNICATION EQUIPMENT
   138,900   Ericsson (L.M.)
               Telephone Co. AB
               (Series "B" Free)................        5,479,698
                                                  ---------------
 
             TOTAL SWEDEN.......................       30,656,734
                                                  ---------------
 
             SWITZERLAND (6.8%)
             FOODS & BEVERAGE, TOBACCO & HOUSEHOLD PRODUCTS
     3,385   Nestle S.A.........................        4,462,361
                                                  ---------------
             MULTI-INDUSTRY
     3,110   ABB AG - Bearer....................        4,704,381
                                                  ---------------
             PHARMACEUTICALS
     4,850   Novartis AG........................        7,748,049
     1,000   Novartis AG - Bearer...............        1,596,167
       772   Roche Holdings AG..................        6,977,591
                                                  ---------------
                                                       16,321,807
                                                  ---------------
 
             TOTAL SWITZERLAND..................       25,488,549
                                                  ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - EUROPEAN GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                               VALUE
- -----------------------------------------------------------------
<C>          <S>                                  <C>
             UNITED KINGDOM (32.0%)
             AEROSPACE & DEFENSE
   133,333   British Aerospace PLC..............  $     2,965,241
   104,000   Smiths Industries PLC..............        1,329,070
                                                  ---------------
                                                        4,294,311
                                                  ---------------
             AIR TRANSPORT
   235,500   British Airways PLC................        2,682,364
                                                  ---------------
             AUTOMOTIVE
   483,678   BBA Group PLC......................        2,849,134
   810,000   Rolls-Royce PLC....................        3,086,554
                                                  ---------------
                                                        5,935,688
                                                  ---------------
             BANKING
   225,000   Abbey National PLC.................        3,070,080
   106,000   Barclays Bank PLC..................        2,102,497
   290,000   Lloyds TSB Group PLC...............        2,977,395
   145,000   National Westminster Bank PLC......        1,948,336
                                                  ---------------
                                                       10,098,308
                                                  ---------------
             BREWERS
   145,000   Scottish & Newcastle Breweries
               PLC..............................        1,558,669
   325,000   Vaux Group PLC.....................        1,465,568
                                                  ---------------
                                                        3,024,237
                                                  ---------------
             BROADCAST MEDIA
   160,000   Flextech PLC*......................        1,730,560
                                                  ---------------
             BUILDING & CONSTRUCTION
   313,000   Blue Circle Industries PLC.........        2,234,369
   207,400   CRH PLC............................        2,170,765
   502,000   Redland PLC........................        2,840,115
                                                  ---------------
                                                        7,245,249
                                                  ---------------
             BUSINESS SERVICES
   196,000   Reuters Holdings PLC...............        2,064,492
                                                  ---------------
             CHEMICALS
   306,000   Albright & Wilson PLC..............          814,694
   215,000   Courtaulds PLC.....................        1,212,806
                                                  ---------------
                                                        2,027,500
                                                  ---------------
             COMPUTER SOFTWARE & SERVICES
   200,000   Sage Group (The) PLC...............        2,179,840
   153,454   SEMA Group PLC.....................        3,166,308
                                                  ---------------
                                                        5,346,148
                                                  ---------------
             COMPUTERS
   286,869   Amstrad PLC........................        1,355,674
                                                  ---------------
 
<CAPTION>
 NUMBER OF
  SHARES                                               VALUE
- -----------------------------------------------------------------
<C>          <S>                                  <C>
             CONGLOMERATES
   435,000   BTR PLC............................  $     1,487,491
   415,000   Tomkins PLC........................        1,795,456
                                                  ---------------
                                                        3,282,947
                                                  ---------------
             ELECTRICAL EQUIPMENT
   210,000   General Electric Co. PLC...........        1,254,490
   306,363   The BICC Group PLC.................          902,325
                                                  ---------------
                                                        2,156,815
                                                  ---------------
             FOOD PROCESSING
   275,000   Associated British
               Foods PLC........................        2,365,792
                                                  ---------------
             FOOD, BEVERAGE, TOBACCO & HOUSEHOLD PRODUCTS
    94,261   B.A.T. Industries PLC..............          843,070
   150,000   Grand Metropolitan PLC.............        1,442,688
   273,000   Guinness PLC.......................        2,671,119
   177,500   Tate & Lyle PLC....................        1,318,782
                                                  ---------------
                                                        6,275,659
                                                  ---------------
             FOREST PRODUCTS, PAPER & PACKING
   206,000   De La Rue PLC......................        1,278,584
                                                  ---------------
             HEALTH & PERSONAL CARE
   700,000   London International Group PLC.....        2,003,456
                                                  ---------------
             INSURANCE
    55,000   Britannic Assurance PLC............          741,312
   123,057   Commercial Union PLC...............        1,293,103
   242,200   Prudential Corp. PLC...............        2,365,410
   327,271   Royal & Sun Alliance Insurance
               Group PLC........................        2,417,930
                                                  ---------------
                                                        6,817,755
                                                  ---------------
             LEISURE
   169,000   Granada Group PLC..................        2,221,606
   405,000   Ladbroke Group PLC.................        1,590,451
   428,000   Rank Group PLC.....................        2,709,891
                                                  ---------------
                                                        6,521,948
                                                  ---------------
             MISCELLANEOUS
   274,000   Vendome Luxury
               Group PLC (Units)++..............        2,038,034
                                                  ---------------
             OIL RELATED
   794,000   Lasmo PLC..........................        3,461,586
   939,000   Shell Transport & Trading Co.
               PLC..............................        6,406,234
                                                  ---------------
                                                        9,867,820
                                                  ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - EUROPEAN GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                               VALUE
- -----------------------------------------------------------------
<C>          <S>                                  <C>
             PHARMACEUTICALS
   191,810   British Biotech PLC*...............  $       718,137
   319,100   Glaxo Wellcome PLC.................        6,597,456
   554,166   Medeva PLC.........................        2,369,880
                                                  ---------------
                                                        9,685,473
                                                  ---------------
             PUBLISHING - NEWSPAPER
    85,490   United News & Media PLC............          990,809
                                                  ---------------
             REAL ESTATE
   203,200   Hammerson PLC......................        1,576,507
                                                  ---------------
             RETAIL
   145,200   Great Universal Stores PLC.........        1,472,630
   247,000   Morrison (W.M.) Supermarkets PLC...          645,283
   214,000   Next PLC...........................        2,421,453
    88,533   W.H. Smith Group PLC (Class A).....          531,821
                                                  ---------------
                                                        5,071,187
                                                  ---------------
             TELECOMMUNICATIONS
   979,700   British Telecommunications PLC.....        7,270,785
   474,000   General Cable PLC*.................        1,285,640
   550,635   Securicor PLC......................        2,611,331
   180,000   Vodafone Group PLC.................          877,594
                                                  ---------------
                                                       12,045,350
                                                  ---------------
             UTILITIES - ELECTRIC
   240,000   National Power PLC.................        2,084,659
                                                  ---------------
 
             TOTAL UNITED KINGDOM...............      119,867,326
                                                  ---------------
 
             TOTAL COMMON AND PREFERRED STOCKS
             (IDENTIFIED COST
             $273,906,874)......................      365,129,136
                                                  ---------------
</TABLE>
 
<TABLE>
<CAPTION>
 CURRENCY
 AMOUNT IN
 THOUSANDS
- -----------
<C>          <S>                                  <C>
             PURCHASED PUT OPTION ON FOREIGN CURRENCY (0.5%)
   DEM 235   July 1, 1997/DEM 1.6026 (Identified
               Cost $451,200)...................        1,851,800
                                                  ---------------
</TABLE>
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN
 THOUSANDS                                             VALUE
- -----------------------------------------------------------------
<C>          <S>                                  <C>
             SHORT-TERM INVESTMENT (a) (2.7%)
             U.S. GOVERNMENT AGENCY
 $  10,000   Federal Home Loan Mortgage Corp.
               6.00% due 07/01/97 (Amortized
               Cost $10,000,000)................  $    10,000,000
                                                  ---------------
 
TOTAL INVESTMENTS
  (IDENTIFIED COST
  $284,358,074) (B).........      100.6%   376,980,936
 
LIABILITIES IN EXCESS OF
CASH
  AND OTHER ASSETS..........       (0.6)    (2,373,224)
                                  -----   ------------
 
NET ASSETS..................      100.0%  $374,607,712
                                  -----   ------------
                                  -----   ------------
 
<FN>
- ---------------------
ADR  American Depository Receipt.
 *   Non-income producing security.
++   Consists of more than one class of securities traded together as a unit;
     stock with attached warrants.
(a)  Security was purchased on a discount basis. The interest rate shown has
     been adjusted to reflect a money market equivalent yield.
(b)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation is $97,893,706 and the
     aggregate gross unrealized depreciation is $5,270,844, resulting in net
     unrealized appreciation of $92,622,862.
</TABLE>
 
FORWARD FOREIGN CURRENCY CONTRACTS OPEN AT JUNE 30, 1997:
 
<TABLE>
<CAPTION>
                                                       UNREALIZED
   CONTRACTS TO          IN EXCHANGE      DELIVERY    APPRECIATION
      RECEIVE                FOR            DATE     (DEPRECIATION)
- -------------------------------------------------------------------
<S>                  <C>                  <C>        <C>
    ESP 199,613,764        $   1,360,045  07/01/97   $     (6,731)
     NLG  1,605,623        $     821,417  07/01/97         (3,890)
    $       218,856        L     131,248  07/01/97            459
    L       274,450        $     457,151  07/03/97           (467)
    $       274,627        FRF 1,601,596  07/31/97          2,196
                                                          -------
      Net unrealized depreciation..................  $     (8,433)
                                                          -------
                                                          -------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - EUROPEAN GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
<TABLE>
<CAPTION>
                                                        PERCENT OF
INDUSTRY                                     VALUE      NET ASSETS
- ------------------------------------------------------------------
<S>                                       <C>           <C>
Aerospace & Defense.....................  $  4,294,311      1.1%
Air Transport...........................     6,192,696      1.7
Auto Trucks & Parts.....................     4,181,512      1.1
Automotive..............................    20,722,976      5.5
Banking.................................    14,566,251      3.9
Banks...................................    12,369,977      3.3
Brewers.................................     3,024,237      0.8
Broadcast Media.........................     1,730,560      0.5
Building & Construction.................     7,245,249      1.9
Building Materials......................     2,203,604      0.6
Business Services.......................     7,673,354      2.0
Chemicals...............................    16,912,507      4.5
Computer Software
 & Services.............................     5,346,148      1.4
Computers...............................     1,355,674      0.4
Conglomerates...........................     3,282,947      0.9
Currency Option.........................     1,851,800      0.5
Electrical Equipment....................    13,808,980      3.7
Electronics -
 Semiconductors.........................     7,841,295      2.1
Financial Services......................     3,425,428      0.9
Food Processing.........................     2,365,792      0.6
Food, Beverage, Tobacco & Household
 Products...............................    17,206,763      4.6
Forest Products, Paper & Packing........     1,278,584      0.3
Health & Personal Care..................     2,027,302      0.5
Household Furnishings & Appliances......     2,982,750      0.8
Insurance...............................    28,119,947      7.5
Leisure.................................     6,521,948      1.7
Machinery...............................       109,697      0.0
 
<CAPTION>
                                                        PERCENT OF
INDUSTRY                                     VALUE      NET ASSETS
- ------------------------------------------------------------------
<S>                                       <C>           <C>
Merchandising...........................  $  2,450,509      0.7%
Miscellaneous...........................     5,606,240      1.5
Multi-Industry..........................     4,704,381      1.3
Oil & Gas Products......................     3,485,794      0.9
Oil Related.............................    18,716,380      5.0
Paper Products..........................     6,550,436      1.7
Pharmaceuticals.........................    38,552,694     10.3
Publishing..............................    10,657,727      2.8
Publishing - Newspaper..................       990,809      0.3
Real Estate.............................     1,576,507      0.4
Record & Tape Distribution..............     2,123,982      0.6
Retail..................................    18,131,711      4.8
Retail - Specialty Apparel..............     2,545,514      0.7
Steel & Iron............................     5,477,511      1.5
Telecommunication
 Equipment..............................     5,479,698      1.5
Telecommunications......................    29,446,503      7.9
Tire & Rubber Goods.....................     3,583,686      1.0
U.S. Government Agency..................    10,000,000      2.7
Utilities...............................     3,842,476      1.0
Utilities - Electric....................     4,416,089      1.2
                                          ------------    -----
                                          $376,980,936    100.6%
                                          ------------    -----
                                          ------------    -----
</TABLE>
 
<TABLE>
<CAPTION>
                                                        PERCENT OF
TYPE OF INVESTMENT                           VALUE      NET ASSETS
- ------------------------------------------------------------------
<S>                                       <C>           <C>
Common Stocks...........................  $365,115,969     97.4%
Currency Option.........................     1,851,800      0.5
Preferred Stocks........................        13,167      0.0
Short-Term Investment...................    10,000,000      2.7
                                          ------------    -----
                                          $376,980,936    100.6%
                                          ------------    -----
                                          ------------    -----
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - PACIFIC GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED)
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
     AMOUNT                                               VALUE
- --------------------------------------------------------------------
<C>                <S>                               <C>
                   COMMON AND PREFERRED STOCKS, WARRANTS, RIGHTS AND
                   BONDS (99.0%)
                   AUSTRALIA (4.9%)
                   BUILDING & CONSTRUCTION
        210,000    Boral, Ltd......................  $       660,015
                                                     ---------------
                   FOOD, BEVERAGE, TOBACCO & HOUSEHOLD PRODUCTS
        204,000    Fosters Brewing Group Ltd.
                     (New).........................          378,237
                                                     ---------------
                   FOODS & BEVERAGES
        440,000    Googman Fielder Wattie Ltd......          646,675
                                                     ---------------
                   MANUFACTURING - DIVERSIFIED
        240,000    Pacific Dunlop Ltd..............          709,081
                                                     ---------------
                   METALS & MINING
         60,000    Broken Hill Proprietary Co.
                     Ltd...........................          881,060
         43,000    CRA Ltd.........................          731,798
        404,000    M.I.M. Holdings, Ltd............          596,810
        195,000    North Ltd.......................          742,206
                                                     ---------------
                                                           2,951,874
                                                     ---------------
                   OIL RELATED
        112,500    Santos, Ltd.....................          472,287
         50,000    Woodside Petroleum Ltd..........          429,609
                                                     ---------------
                                                             901,896
                                                     ---------------
                   RETAIL STORES
        100,000    Coles Myer Ltd..................          519,299
                                                     ---------------
 
                   TOTAL AUSTRALIA.................        6,767,077
                                                     ---------------
 
                   CHINA (0.7%)
                   AUTOMOTIVE
        534,000    Qingling Motors Co..............          275,737
                                                     ---------------
                   MACHINERY
        138,000    First Tractor Co. Ltd.*.........           90,854
                                                     ---------------
                   STEEL
        162,000    Bengang Steel Plates Co., Ltd.
                     (B Shares)*...................           49,772
                                                     ---------------
                   UTILITIES
         12,000    Huaneng Power International,
                     Inc. (Class N) (ADR)*.........          306,000
         25,000    Shandong Huaneng Power Co., Ltd.
                     (ADR).........................          268,750
                                                     ---------------
                                                             574,750
                                                     ---------------
 
                   TOTAL CHINA.....................          991,113
                                                     ---------------
 
<CAPTION>
SHARES/PRINCIPAL
     AMOUNT                                               VALUE
- --------------------------------------------------------------------
<C>                <S>                               <C>
 
                   HONG KONG (32.1%)
                   BANKING
        178,800    Bank of East Asia, Ltd..........  $       745,529
        145,000    Dao Heng Bank Group Ltd.........          793,649
         96,000    Guoco Group Ltd.................          505,622
        134,000    Hang Seng Bank Ltd..............        1,911,444
         71,200    HSBC Holdings PLC...............        2,141,561
        455,000    International Bank of Asia......          431,711
                                                     ---------------
                                                           6,529,516
                                                     ---------------
                   BANKS
         56,000    Dah Sing Financial Group........          310,127
                                                     ---------------
                   BUILDING & CONSTRUCTION
         90,000    Cheung Kong Infrastructure
                     Holdings......................          260,827
                                                     ---------------
                   COMMERCIAL SERVICES
        400,000    Cosco Pacific Ltd...............          926,870
                                                     ---------------
                   CONGLOMERATES
         21,000    Citic Pacific, Ltd..............          131,208
        588,000    Hutchison Whampoa, Ltd..........        5,085,652
         64,000    Jardine Matheson Holdings
                     Ltd...........................          454,400
        110,000    Shanghai Industrial Holdings
                     Ltd...........................          684,438
        218,000    Swire Pacific Ltd. (Class A)....        1,962,886
                                                     ---------------
                                                           8,318,584
                                                     ---------------
                   ELECTRONICS
        935,000    Elec & Eltek International
                     Holdings Ltd..................          274,592
         90,000    Johnson Electric Holdings,
                     Ltd...........................          268,379
                                                     ---------------
                                                             542,971
                                                     ---------------
                   ENGINEERING & CONSTRUCTION
        455,000    Road King Infrastructure
                     Ltd.*.........................          384,722
                                                     ---------------
                   FINANCIAL SERVICES
        730,000    Manhattan Card Co. Ltd..........          332,182
                                                     ---------------
                   INVESTMENT COMPANIES
         75,000    Hutchinson Whampoa Ltd..........          648,680
                                                     ---------------
                   LEISURE
      1,431,000    CDL Hotels International,
                     Ltd...........................          581,895
                                                     ---------------
                   PUBLISHING
        555,000    South China Morning Post
                     (Holdings) Ltd................          544,504
                                                     ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - PACIFIC GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
     AMOUNT                                               VALUE
- --------------------------------------------------------------------
<C>                <S>                               <C>
                   REAL ESTATE
        444,000    Amoy Properties, Ltd............  $       490,054
        458,000    Cheung Kong (Holdings) Ltd......        4,522,946
        324,000    China Resources Enterprise
                     Ltd...........................        1,589,363
        150,000    Great Eagle Holdings Ltd........          494,740
        162,676    Henderson China Holding Ltd.....          274,049
         86,000    Henderson Land Development Co.
                     Ltd...........................          763,248
        120,000    HKR International Ltd...........          166,527
        345,000    Hong Kong Land Holdings Ltd.....          917,700
         75,000    Hysan Development Co. Ltd.......          221,229
          6,250    Hysan Development Co. Ltd.
                     (Warrants due 04/30/98)*......            2,420
        431,000    New World Development...........        2,570,477
        268,000    Sino Land Co....................          290,609
        324,000    Sun Hung Kai Properties Ltd.....        3,900,213
        420,000    Wharf (Holdings) Ltd............        1,821,726
                                                     ---------------
                                                          18,025,301
                                                     ---------------
                   RETAIL
         96,399    Dickson Concepts International
                     Ltd. (New)....................          350,926
                                                     ---------------
                   TELECOMMUNICATIONS
      1,340,000    Hong Kong Telecommunications
                     Ltd...........................        3,200,155
                                                     ---------------
                   TRANSPORTATION
        794,000    The Guangshen Railway Co.,
                     Ltd...........................          348,493
                                                     ---------------
                   UTILITIES
        213,500    China Light & Power Co. Ltd.....        1,209,921
        119,500    Hong Kong & China Gas Co.
                     (Warrants due 09/30/97)*......          128,038
        424,400    Hong Kong & China Gas Co.
                     Ltd...........................          849,183
        227,000    Hong Kong Electric Holdings
                     Ltd...........................          914,271
                                                     ---------------
                                                           3,101,413
                                                     ---------------
                   TOTAL HONG KONG.................       44,407,166
                                                     ---------------
 
<CAPTION>
SHARES/PRINCIPAL
     AMOUNT                                               VALUE
- --------------------------------------------------------------------
<C>                <S>                               <C>
 
                   INDIA (1.0%)
                   BANKING
         20,000    State Bank of India (GDR).......  $       517,000
                                                     ---------------
                   TELECOMMUNICATIONS
         18,000    Videsh Sanchar Nigam Ltd.
                     (GDR).........................          371,700
                                                     ---------------
                   TEXTILES
         10,000    Reliance Industries (GDR).......          226,500
         10,000    Reliance Industries (GDR) -
                     144A**........................          226,500
                                                     ---------------
                                                             453,000
                                                     ---------------
 
                   TOTAL INDIA.....................        1,341,700
                                                     ---------------
 
                   INDONESIA (7.7%)
                   AUTOMOTIVE
      1,150,000    PT Gadjah Tunggal...............          567,668
                                                     ---------------
                   BANKING
        600,000    Bank Negara Indonesia (Alien
                     Market).......................          382,559
        100,000    PT Bank Dagang Nasional
                     (Warrants due 02/14/00) (Alien
                     Market)*......................           41,135
      1,400,000    PT Bank Dagang Nasional
                     Indonesia.....................          993,418
        998,031    PT Bank International
                     Indonesia.....................          862,141
        113,158    PT Bank International Indonesia
                     (Warrants due 01/17/00)*......           44,221
                                                     ---------------
                                                           2,323,474
                                                     ---------------
                   BUILDING MATERIALS
      1,401,464    PT Mulia Industrindo (Alien
                     Market).......................          735,034
                                                     ---------------
                   COMMERCIAL SERVICES
        600,000    PT Citra Marga Nusaphala Persada
                     (Alien Market)................          351,707
        600,000    PT Citra Marga Nusaphala Persada
                     (Rights)*.....................          228,301
        340,000    PT Steady Safe..................          398,601
                                                     ---------------
                                                             978,609
                                                     ---------------
                   CONGLOMERATES
        300,000    PT Bimantara Citra (Alien
                     Market).......................          524,476
                                                     ---------------
                   CONSTRUCTION PLANT & EQUIPMENT
        240,000    PT United Tractors..............          888,523
                                                     ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - PACIFIC GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
     AMOUNT                                               VALUE
- --------------------------------------------------------------------
<C>                <S>                               <C>
                   FOOD, BEVERAGE, TOBACCO & HOUSEHOLD PRODUCTS
         40,000    PT Hanjaya Mandala Sampoerna....  $       152,612
                                                     ---------------
                   FOREST PRODUCTS, PAPER & PACKING
        259,380    PT Indah Kiat Pulp Paper
                     Corp..........................          152,043
          5,187    PT Indah Kiat Pulp Paper Corp.
                     (Rights)*.....................           40,807
          7,433    PT Pabrik Kertas Tjiwi Kimia....            8,638
                                                     ---------------
                                                             201,488
                                                     ---------------
                   INVESTMENT COMPANIES
              1    Peregrine Indonesia (Units) ++
                     ** *..........................          557,400
                                                     ---------------
                   METALS
        290,000    PT Tambang Timah................          450,329
                                                     ---------------
                   PHARMACEUTICALS
        400,000    PT Kalbe Farma (Alien Market)...          534,759
                                                     ---------------
                   PLANTATION
        120,000    PT London Sumatra...............          380,091
                                                     ---------------
                   REAL ESTATE
         30,000    Kawasan Jababeka - 144A**
                     (GDR).........................          420,000
                                                     ---------------
                   RETAIL
        250,000    PT Ramayana Lestari Sentosa.....          719,868
                                                     ---------------
                   TELECOMMUNICATIONS
        766,000    PT Telekomunikasi Indonesia.....        1,252,509
                                                     ---------------
                   TOTAL INDONESIA.................       10,686,840
                                                     ---------------
                   JAPAN (18.1%)
                   APPAREL
         21,000    Tokyo Style.....................          291,361
          6,000    World Co., Ltd..................          263,351
                                                     ---------------
                                                             554,712
                                                     ---------------
                   AUTO TRUCKS & PARTS
          6,000    Yasunaga Corp...................           74,346
                                                     ---------------
                   AUTOMOTIVE
         14,000    Honda Motor Co..................          421,466
         13,000    Toyota Motor Corp...............          383,421
                                                     ---------------
                                                             804,887
                                                     ---------------
 
<CAPTION>
SHARES/PRINCIPAL
     AMOUNT                                               VALUE
- --------------------------------------------------------------------
<C>                <S>                               <C>
                   BANKING
         25,000    Asahi Bank, Ltd.................  $       212,696
         30,000    Bank of Tokyo-Mitsubishi Ltd....          602,094
         24,000    Mitsui Trust & Banking Co.,
                     Ltd...........................          181,152
         16,000    Sanwa Bank, Ltd.................          237,347
         16,000    Sumitomo Bank...................          262,478
         11,000    Sumitomo Trust & Banking........          118,063
                                                     ---------------
                                                           1,613,830
                                                     ---------------
                   BUILDING & CONSTRUCTION
         36,000    Kajima Corp.....................          210,785
          7,000    Kaneshita Construction..........           54,668
                                                     ---------------
                                                             265,453
                                                     ---------------
                   BUILDING MATERIALS
         36,000    Sanwa Shutter...................          326,702
                                                     ---------------
                   BUSINESS SERVICES
          4,000    Secom Co........................          293,543
                                                     ---------------
                   CHEMICALS
         80,000    Mitsubishi Chemical Corp........          261,082
         61,000    Nippon Zeon Co. Ltd.............          301,274
         12,000    Shin-Etsu Chemical Co...........          318,325
         30,000    Sumitomo Bakelite Co. Ltd.......          242,147
                                                     ---------------
                                                           1,122,828
                                                     ---------------
                   CHEMICALS - SPECIALTY
         35,000    Nippon Steel Chemical...........          111,780
                                                     ---------------
                   COMMERCIAL SERVICES
          9,000    Meitec Corp.....................          267,801
          2,000    Nichii Gakkan Co................          111,693
                                                     ---------------
                                                             379,494
                                                     ---------------
                   COMPUTER EQUIPMENT
          5,400    I-O Data Device, Inc............          179,058
                                                     ---------------
                   COMPUTER SOFTWARE & SERVICES
          8,000    Hitachi Software Engineering
                     Co............................          196,161
          8,000    Ines Corp.......................          142,408
              8    NTT Data Communications Systems
                     Corp..........................          309,250
                                                     ---------------
                                                             647,819
                                                     ---------------
                   COMPUTERS
         29,000    Fujitsu, Ltd....................          402,356
          3,000    Nidec Corp......................          146,597
                                                     ---------------
                                                             548,953
                                                     ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - PACIFIC GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
     AMOUNT                                               VALUE
- --------------------------------------------------------------------
<C>                <S>                               <C>
                   DATA PROCESSING
          4,000    Ricoh Elemex....................  $        52,007
                                                     ---------------
                   ELECTRICAL EQUIPMENT
         19,000    Sumitomo Electric Industries....          318,325
                                                     ---------------
                   ELECTRONIC & ELECTRICAL EQUIPMENT
         13,000    Aiwa Co.........................          298,342
          3,000    Canon, Inc......................           81,675
       Y  9,000K   Canon, Inc. 1.00% due 12/20/02
                     (Conv.).......................          166,571
         29,000    Hitachi, Ltd....................          323,909
          3,000    Kyocera Corp....................          238,220
         10,000    Mitsui High-Tec.................          240,838
          8,000    Murata Manufacturing Co.,
                     Ltd...........................          315,532
         10,000    Nitto Electric Works............          178,010
         17,000    Sharp Corp......................          234,380
          4,700    Sony Corp.......................          409,712
          5,000    TDK Corp........................          366,928
                                                     ---------------
                                                           2,854,117
                                                     ---------------
                   ELECTRONICS
       Y  5,000K   Nippon Densan Corp. 1.00% due
                     09/30/03 (Conv.)..............           65,358
          3,000    Rohm Co., Ltd...................          308,901
                                                     ---------------
                                                             374,259
                                                     ---------------
                   ELECTRONICS - SEMICONDUCTORS/COMPONENTS
         20,000    Toshiba Ceramics................          204,188
                                                     ---------------
                   ELECTRONICS - SPECIALTY
         14,000    Taiyo Yuden Co., Ltd............          230,890
                                                     ---------------
                   ENGINEERING & CONSTRUCTION
         24,000    Nippon Comsys Corp..............          356,021
                                                     ---------------
                   ENTERTAINMENT
          3,000    H.I.S. Company Ltd..............          158,377
          3,000    Nintendo Corp., Ltd.............          250,785
          7,900    Sony Music Entertainment Inc....          370,183
                                                     ---------------
                                                             779,345
                                                     ---------------
                   FINANCIAL SERVICES
         16,000    Daiwa Securities Co., Ltd.......          126,213
          1,900    Nichiei Co., Ltd. (Kyoto).......          222,164
         13,000    Nomura Securities Co. Ltd.......          179,232
          1,100    Sanyo Shinpan Finance Co.,
                     Ltd...........................           68,054
                                                     ---------------
                                                             595,663
                                                     ---------------
 
<CAPTION>
SHARES/PRINCIPAL
     AMOUNT                                               VALUE
- --------------------------------------------------------------------
<C>                <S>                               <C>
                   FOOD, BEVERAGE, TOBACCO & HOUSEHOLD PRODUCTS
         19,000    Nippon Meat Packers, Inc........  $       245,375
                                                     ---------------
                   GLASS
         18,000    Nippon Electric Glass Co.,
                     Ltd...........................          312,565
                                                     ---------------
                   HEALTH & PERSONAL CARE
          5,000    Kawasumi Laboratories, Inc......           82,024
                                                     ---------------
                   INDUSTRIALS
         20,000    Nippon Thompson Co..............          190,227
         13,000    Tokai Carbon Co., Ltd...........           57,173
                                                     ---------------
                                                             247,400
                                                     ---------------
                   INSURANCE
         30,000    Tokio Marine & Fire Insurance
                     Co............................          392,670
                                                     ---------------
                   MACHINE TOOLS
          7,000    Nitto Kohki Co. Ltd.............          241,885
         30,000    OSG Corp........................          216,230
                                                     ---------------
                                                             458,115
                                                     ---------------
                   MACHINERY
         33,000    Amada Co., Ltd..................          290,838
         22,000    Daifuku Co. Ltd.................          289,878
          6,000    Fuji Machine Manufacturing
                     Co............................          217,277
          2,000    Keyence Corp....................          296,684
       Y 19,000K   Minebea Co. Ltd. 0.80% due
                     03/31/03 (Conv.)..............          237,086
         43,000    Mitsubishi Heavy Industries,
                     Ltd...........................          329,817
         11,000    Tsudakoma.......................           52,024
                                                     ---------------
                                                           1,713,604
                                                     ---------------
                   MANUFACTURING
          3,000    Arcland Sakamoto................           36,387
         18,000    Dainippon Screen Manufacturing
                     Co. Ltd.......................          169,634
          5,000    Nichiha Corp....................           78,534
                                                     ---------------
                                                             284,555
                                                     ---------------
                   MEDICAL SUPPLIES
         11,000    Terumo Corp.....................          210,209
                                                     ---------------
                   MERCHANDISING
          4,000    Misumi Corp.....................           99,476
                                                     ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - PACIFIC GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
     AMOUNT                                               VALUE
- --------------------------------------------------------------------
<C>                <S>                               <C>
                   METALS
          4,100    Fujimi Inc......................  $       268,682
          5,000    Sumitomo Special Metals.........           81,152
                                                     ---------------
                                                             349,834
                                                     ---------------
                   METALS & MINING
         75,000    Nippon Steel Co.................          239,529
         10,000    Sumitomo Sitix Corp.............          214,660
                                                     ---------------
                                                             454,189
                                                     ---------------
                   METALS NON-FERROUS
         32,000    Fujikura Ltd....................          298,778
         69,000    Mitsui Mining & Smelting........          306,466
                                                     ---------------
                                                             605,244
                                                     ---------------
                   MISCELLANEOUS MATERIALS & COMMODITIES
          9,000    Minebea Co., Ltd................           95,812
                                                     ---------------
                   MULTI-INDUSTRY
         37,000    Mitsui & Co.....................          355,148
          2,000    Trusco Nakayama Corp............           40,663
          3,000    Yamae Hisano....................           23,168
                                                     ---------------
                                                             418,979
                                                     ---------------
                   NATURAL GAS
         82,000    Tokyo Gas Co., Ltd..............          227,539
                                                     ---------------
                   OFFICE EQUIPMENT
         15,000    Ricoh Company, Ltd..............          196,335
          2,600    Riso Kagaku.....................          213,264
                                                     ---------------
                                                             409,599
                                                     ---------------
                   OIL RELATED
         16,000    General Sekiyu..................          106,108
                                                     ---------------
                   PHARMACEUTICALS
         18,000    Daiichi Pharmaceutical..........          317,277
         15,000    Eisai Co. Ltd...................          284,031
                                                     ---------------
                                                             601,308
                                                     ---------------
                   REAL ESTATE
         14,000    Mitsubishi Estate Co. Ltd.......          202,792
         23,000    Mitsui Fudosan Co., Ltd.........          317,103
          3,000    Sekiwa Real Estate..............           21,728
                                                     ---------------
                                                             541,623
                                                     ---------------
                   RETAIL
          4,000    Circle K Japan Co. Ltd..........          229,668
          1,900    Ministop Co., Ltd...............           64,660
          2,000    Olympic Corp....................           39,093
          2,500    Otsuka Kagu Ltd.................          197,862
          4,000    Seven - Eleven Japan Co.,
                     Ltd...........................          302,269
 
<CAPTION>
SHARES/PRINCIPAL
     AMOUNT                                               VALUE
- --------------------------------------------------------------------
<C>                <S>                               <C>
          8,500    Shimachu Co., Ltd...............  $       255,148
                                                     ---------------
                                                           1,088,700
                                                     ---------------
                   RETAIL - DEPARTMENT STORES
         28,000    Hankyu Department Stores........          295,637
                                                     ---------------
                   RETAIL - MERCHANDISING
          6,000    Shimamura Co. Ltd...............          213,613
                                                     ---------------
                   RETAIL - SPECIALTY
          6,000    Aderans Co. Ltd.................          170,681
                                                     ---------------
                   STEEL
        123,000    Sumitomo Metal Industries.......          349,895
                                                     ---------------
                   STEEL & IRON
         15,000    Yamato Kogyo Co., Ltd...........          147,906
                                                     ---------------
                   TELECOMMUNICATIONS
             46    DDI Corp........................          339,581
          8,000    Nippon Denwa Shisetsu...........           68,691
             41    Nippon Telegraph & Telephone
                     Corp..........................          393,543
                                                     ---------------
                                                             801,815
                                                     ---------------
                   TEXTILES
         78,000    Mitsubishi Rayon Co., Ltd.......          321,257
         45,000    Nitto Boseki Co.................          155,105
                                                     ---------------
                                                             476,362
                                                     ---------------
                   TRANSPORTATION
         17,000    Fukuyama Transporting Co........          120,157
          2,000    Kanto Seino Transportation......           46,248
         37,000    Tokyu Corp......................          229,555
                                                     ---------------
                                                             395,960
                                                     ---------------
                   UTILITIES
          8,900    Hokkaido Electric Power.........          159,206
          7,500    Tokyo Electric Power Co.........          157,723
                                                     ---------------
                                                             316,929
                                                     ---------------
                   WHOLESALE & INTERNATIONAL TRADE
          5,600    Satori Electric Co. Ltd.........          175,916
                                                     ---------------
 
                   TOTAL JAPAN.....................       24,977,862
                                                     ---------------
 
                   MALAYSIA (12.5%)
                   AUTOMOTIVE
        104,000    Diversified Resources Berhad....          220,444
         54,800    Oriental Holdings Berhad........          412,520
         50,000    Perusahaan Otomobil Nasional
                     Berhad........................          233,756
        109,000    Tan Chong Motor Holdings
                     Berhad........................          205,563
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - PACIFIC GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
     AMOUNT                                               VALUE
- --------------------------------------------------------------------
<C>                <S>                               <C>
         51,000    UMW Holdings Berhad.............  $       240,452
                                                     ---------------
                                                           1,312,735
                                                     ---------------
                   BANKING
        152,000    Kwong Yik Bank..................          514,897
        127,600    Malayan Banking Berhad..........        1,339,699
        266,666    Public Bank Berhad (Alien
                     Market).......................          416,269
                                                     ---------------
                                                           2,270,865
                                                     ---------------
                   BUILDING & CONSTRUCTION
          8,000    Dialog Group Berhad.............          115,689
        124,999    Gamuda Berhad...................          438,289
         16,666    Gamuda Berhad (Warrants due
                     12/29/01)*....................           18,489
        135,000    Lingkaran Trans Kota Holdings
                     Berhad*.......................          280,804
        204,000    Sungei Way Holdings Berhad......          384,723
        120,000    United Engineers Malaysia
                     Berhad........................          865,293
                                                     ---------------
                                                           2,103,287
                                                     ---------------
                   CONGLOMERATES
        250,000    Berjaya Group Berhad............          307,052
        350,000    Renong Berhad...................          457,607
         81,000    Sime Darby Berhad...............          269,572
                                                     ---------------
                                                           1,034,231
                                                     ---------------
                   CONSTRUCTION PLANT & EQUIPMENT
         60,500    YTL Corp. Berhad................          186,965
                                                     ---------------
                   DIVERSIFIED MANUFACTURING
        200,000    Antah Holdings Berhad...........          256,735
                                                     ---------------
                   ELECTRONIC & ELECTRICAL EQUIPMENT
        140,000    Leader Universal Holdings
                     Berhad........................          251,823
                                                     ---------------
                   FINANCIAL SERVICES
        194,000    Affin Holdings Berhad...........          461,173
         25,000    AMMB Holdings Berhad............          155,507
          2,400    Hong Leong Credit (Rights)*.....            2,377
          4,800    Hong Leong Credit Berhad........           17,876
        200,000    Public Finance Berhad...........          307,449
         50,000    Rashid Hussain Berhad...........          316,957
                                                     ---------------
                                                           1,261,339
                                                     ---------------
                   INSURANCE
         59,400    Malaysian Assurance Alliance
                     Berhad........................          345,951
                                                     ---------------
 
<CAPTION>
SHARES/PRINCIPAL
     AMOUNT                                               VALUE
- --------------------------------------------------------------------
<C>                <S>                               <C>
                   LEISURE
         46,000    Berjaya Sports Toto Berhad......  $       216,878
        290,000    Magnum Corporation Berhad.......          436,609
        268,000    Metroplex Berhad................          278,193
        110,000    Resorts World Berhad............          331,220
                                                     ---------------
                                                           1,262,900
                                                     ---------------
                   MANUFACTURING
         57,000    Malaysian Pacific Industries
                     Berhad........................          248,415
         19,375    O.Y.L. Industries Berhad........          122,821
                                                     ---------------
                                                             371,236
                                                     ---------------
                   MULTI-INDUSTRY
        110,000    Multi-Purpose Holdings Berhad...          154,279
        338,000    Multi-Purpose Holdings Berhad
                     3.00% due 01/13/02 (Loan
                     Stock)........................          113,827
        135,000    Nylex Berhad....................          229,992
         50,000    Road Builder (M) Holdings
                     Berhad........................          235,737
                                                     ---------------
                                                             733,835
                                                     ---------------
                   PLANTATION
        170,000    Highlands & Lowlands Berhad.....          259,984
        210,000    Industrial Oxygen Incorporated
                     Berhad........................          239,620
        105,500    Kuala Lumpur Kepong Berhad......          261,242
                                                     ---------------
                                                             760,846
                                                     ---------------
                   PUBLISHING
         87,000    Star Publications (Malaysia)....          372,266
                                                     ---------------
                   REAL ESTATE
        177,000    Hong Leong Properties Berhad....          201,264
        149,000    Pelangi Berhad..................          152,306
                                                     ---------------
                                                             353,570
                                                     ---------------
                   SHIPPING
              5    Bumi Armada Berhad*.............               12
                                                     ---------------
                   TELECOMMUNICATIONS
        255,000    Telekom Malaysia Berhad.........        1,192,155
                                                     ---------------
                   TRANSPORTATION
         95,000    Konsortium Perkapalan Berhad....          560,816
                                                     ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - PACIFIC GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
     AMOUNT                                               VALUE
- --------------------------------------------------------------------
<C>                <S>                               <C>
                   UTILITIES
         35,000    Prime Utilities Berhad..........  $       256,537
         12,000    Prime Utilities Berhad (Warrants
                     due 03/11/01)*................           20,349
         24,000    Prime Utilities Berhad 1.00% due
                     03/01/01 (Loan Stock)*........            7,132
        130,000    Puncak Niaga Holdings Berhad*...          231,775
        442,000    Tenaga Nasional Berhad..........        2,153,962
                                                     ---------------
                                                           2,669,755
                                                     ---------------
                   TOTAL MALAYSIA..................       17,301,322
                                                     ---------------
                   PHILIPPINES (1.8%)
                   BANKING
         30,000    Far East Bank & Trust...........           75,142
         40,947    Philippine National Bank*.......          278,160
         65,336    Security Bank Corp*.............           78,106
                                                     ---------------
                                                             431,408
                                                     ---------------
                   CONGLOMERATES
        325,000    First Philippine Holdings Corp.
                     (B Shares)....................          450,190
                                                     ---------------
                   DIVERSIFIED MANUFACTURING
        750,000    Solid Group, Inc................          122,391
                                                     ---------------
                   ENGINEERING & CONSTRUCTION
      2,100,000    DMCI Holdings, Inc.*............          693,358
                                                     ---------------
                   REAL ESTATE
      1,500,000    Belle Corp.*....................          438,330
                                                     ---------------
                   UTILITIES
         65,000    Manila Electric Co. (B
                     Shares).......................          320,683
                                                     ---------------
                   TOTAL PHILIPPINES...............        2,456,360
                                                     ---------------
 
                   SINGAPORE (9.0%)
                   BANKING
         99,000    Development Bank of Singapore,
                     Ltd...........................        1,246,851
        152,520    Overseas Chinese Banking Corp.,
                     Ltd...........................        1,579,412
        128,000    United Overseas Bank, Ltd.......        1,316,541
                                                     ---------------
                                                           4,142,804
                                                     ---------------
 
<CAPTION>
SHARES/PRINCIPAL
     AMOUNT                                               VALUE
- --------------------------------------------------------------------
<C>                <S>                               <C>
                   CONGLOMERATES
         83,000    Keppel Corp. Ltd.*..............  $       368,773
        110,000    Sembawang Corp. Ltd.............          500,280
                                                     ---------------
                                                             869,053
                                                     ---------------
                   ELECTRONIC & ELECTRICAL EQUIPMENT
         37,000    Elec & Eltek International Co.
                     Ltd...........................          207,200
        175,000    Venture Manufacturing Ltd.......          570,599
                                                     ---------------
                                                             777,799
                                                     ---------------
                   FINANCE
         42,000    Hong Leong Finance Ltd..........          119,312
                                                     ---------------
                   FOOD, BEVERAGE, TOBACCO & HOUSEHOLD PRODUCTS
         42,600    Fraser & Neave Ltd..............          304,030
                                                     ---------------
                   METALS
        238,000    Amtek Engineering Ltd...........          417,982
                                                     ---------------
                   PUBLISHING
         19,200    Singapore Press Holdings........          386,902
                                                     ---------------
                   REAL ESTATE
          5,000    Bukit Sembawang Estates Ltd.....           92,359
        128,000    City Developments, Ltd..........        1,253,848
        106,000    DBS Land Ltd....................          335,236
         85,000    Parkway Holdings Ltd............          380,633
         32,000    Singapore Land Ltd..............          145,536
        204,000    United Overseas Land, Ltd.......          276,910
        132,000    Wing Tai Holdings Ltd...........          380,521
                                                     ---------------
                                                           2,865,043
                                                     ---------------
                   SHIPBUILDING
         24,500    Keppel Corp. Ltd................          106,283
                                                     ---------------
                   STEEL & IRON
        212,000    Natsteel Ltd....................          539,938
                                                     ---------------
                   TELECOMMUNICATIONS
        255,000    Singapore Telecommunications,
                     Ltd...........................          471,033
                                                     ---------------
                   TRANSPORTATION
        153,000    Singapore Airlines Ltd..........        1,370,277
                                                     ---------------
 
                   TOTAL SINGAPORE.................       12,370,456
                                                     ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - PACIFIC GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
     AMOUNT                                               VALUE
- --------------------------------------------------------------------
<C>                <S>                               <C>
                   SOUTH KOREA (5.0%)
                   AUTOMOTIVE
          9,000    Hyundai Motor Co., Ltd. (GDR)...  $       298,128
                                                     ---------------
                   BANKING
         48,670    Cho Hung Bank...................          324,100
          1,310    Kookmin Bank....................           24,849
            132    Kookmin Bank (Rights)*..........            2,504
         40,740    Shinhan Bank....................          610,318
                                                     ---------------
                                                             961,771
                                                     ---------------
                   COMMUNICATIONS - EQUIPMENT/MANUFACTURERS
          3,500    LG Information & Communication
                     Ltd...........................          447,573
                                                     ---------------
                   CONGLOMERATES
  $         250K   Daewoo Corp. 0.25% due 12/31/08
                     (Conv.).......................          275,000
                                                     ---------------
                   ELECTRICAL EQUIPMENT
          5,500    Samsung Display Devices Co......          300,482
                                                     ---------------
                   ELECTRONICS
          7,481    Samsung Electronics Co..........          831,396
          4,388    Samsung Electronics Co.
                     (GDR)*........................          120,231
            123    Samsung Electronics Co.
                     (Rights)......................           13,670
             74    Samsung Electronics Co.
                     (Rights)......................            4,329
                                                     ---------------
                                                             969,626
                                                     ---------------
                   ENGINEERING & CONSTRUCTION
         15,300    Hyundai Engineering &
                     Construction Co...............          393,725
                                                     ---------------
                   INSURANCE
         10,000    Oriental Fire & Marine
                     Insurance.....................          252,822
                                                     ---------------
                   INVESTMENT COMPANIES
         25,000    Atlantis Korean Smaller Co's*...          187,500
                                                     ---------------
                   MACHINERY
         58,300    Daewoo Heavy Industries.........          480,350
                                                     ---------------
                   OIL RELATED
         14,358    Yukong, Ltd. (GDS)..............          348,416
                                                     ---------------
                   STEEL & IRON
          8,380    Pohang Iron & Steel Co..........          864,218
                                                     ---------------
                   TELECOMMUNICATIONS
             37    SK Telecom Co. Ltd..............           27,418
                                                     ---------------
 
<CAPTION>
SHARES/PRINCIPAL
     AMOUNT                                               VALUE
- --------------------------------------------------------------------
<C>                <S>                               <C>
                   UTILITIES
         23,750    Korea Electric Power Corp.......  $       710,356
          1,000    Samchully Co....................           65,835
          7,000    Seoul City Gas Co Ltd...........          319,187
                                                     ---------------
                                                           1,095,378
                                                     ---------------
 
                   TOTAL SOUTH KOREA...............        6,902,407
                                                     ---------------
 
                   TAIWAN (3.5%)
                   BUILDING MATERIALS
         12,523    Asia Cement Corp. (GDR).........          197,237
                                                     ---------------
                   CHEMICALS - SPECIALTY
  $         205K   Nan Ya Plastics Corp. 1.75% due
                     07/09/01 (Conv.)..............          293,663
                                                     ---------------
                   ELECTRONICS
  $         185K   Compal Electronics 1.00% due
                     11/21/03 (Conv.)..............          316,350
  $         180K   United Microelectronics - 144A**
                     0.25% due 05/16/04 (Conv.)....          228,600
                                                     ---------------
                                                             544,950
                                                     ---------------
                   INVESTMENT COMPANIES
             90    Taipei Fund*....................        1,116,000
         37,400    Taiwan American Fund (Pref.)*...          682,550
                                                     ---------------
                                                           1,798,550
                                                     ---------------
                   RETAIL
  $         330K   Far Eastern Department Stores -
                     144A** 3.00% due 07/06/01
                     (Conv.).......................          355,575
                                                     ---------------
                   STEEL & IRON
         31,262    China Steel Corp. (GDR).........          668,069
                                                     ---------------
                   TRANSPORTATION
  $         500K   U-Ming Marine Transport 1.50%
                     due 02/07/01 (Conv.)..........          411,250
  $         504K   Yang Ming Marine Transportation
                     - 144A** 2.00% due 10/06/01
                     (Conv.).......................          559,440
                                                     ---------------
                                                             970,690
                                                     ---------------
 
                   TOTAL TAIWAN....................        4,828,734
                                                     ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - PACIFIC GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
     AMOUNT                                               VALUE
- --------------------------------------------------------------------
<C>                <S>                               <C>
                   THAILAND (2.7%)
                   BANKING
         60,000    Bangkok Bank PCL................  $       412,674
                                                     ---------------
                   ENTERTAINMENT
         20,000    Grammy Entertainment PLC........          222,566
                                                     ---------------
                   INVESTMENT COMPANIES
        600,000    Ruang Khao 2 Fund (Units) ++....          146,059
                                                     ---------------
                   METALS & MINING
         23,100    Ban Pu Coal Co., Ltd............          337,395
         76,300    Lanna Lignite Public Co. (Alien
                     Market).......................          539,525
                                                     ---------------
                                                             876,920
                                                     ---------------
                   OIL RELATED
         65,000    PTT Exploration & Production
                     PCL...........................          944,359
                                                     ---------------
                   TELECOMMUNICATIONS
         45,000    United Communication Industry...          186,051
                                                     ---------------
                   TRANSPORTATION
        550,000    Bangkok Expressway Public Co.
                     (Alien Market)*...............          584,428
                                                     ---------------
                   UTILITIES - ELECTRIC
        110,000    Cogeneration Public Co.*........          295,402
                                                     ---------------
 
                   TOTAL THAILAND..................        3,668,459
                                                     ---------------
 
                   TOTAL COMMON AND PREFERRED
                   STOCKS, WARRANTS, RIGHTS AND
                   BONDS
                   (IDENTIFIED COST $124,108,197)..      136,699,496
                                                     ---------------
</TABLE>
 
<TABLE>
<CAPTION>
                           DESCRIPTION,
  NUMBER OF              EXPIRATION DATE
  CONTRACTS              AND STRIKE PRICE                 VALUE
- --------------------------------------------------------------------
<C>            <S>                                   <C>
               PURCHASED PUT OPTION ON FOREIGN CURRENCY (0.0%)
       27,000  August 1997/THB 26.97
                 (Identified Cost $79,920).........  $        32,400
                                                     ---------------
 
               TOTAL INVESTMENTS
               (IDENTIFIED COST $124,188,117)......      136,731,896
                                                     ---------------
                                                     ---------------
 
               WRITTEN PUT OPTION ON FOREIGN CURRENCY (0.1%)
       27,000  August 1997/THB 26.97 (Premium
                 Received $79,920).................         (153,090)
                                                     ---------------
                                                     ---------------
 
TOTAL INVESTMENTS
  (IDENTIFIED COST
  $124,188,117) (A).........       99.0%   136,731,896
 
TOTAL WRITTEN OPTION
  OUTSTANDING...............       (0.1%)     (153,090)
 
CASH AND OTHER ASSETS
  IN EXCESS OF
LIABILITIES.................        1.1%     1,572,327
                                  -----   ------------
 
NET ASSETS..................      100.0%  $138,151,133
                                  -----   ------------
                                  -----   ------------
 
<FN>
- ---------------------
ADR  American Depository Receipt.
GDR  Global Depository Receipt.
GDS  Global Depository Share.
 K   In thousands.
 *   Non-income producing security.
**   Resale is restricted to qualified institutional investors.
++   Consists of one or more class of securities traded together as a unit;
     stocks with attached warrants.
(a)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation is $21,417,110 and the
     aggregate gross unrealized depreciation is $8,873,331, resulting in net
     unrealized appreciation of $12,543,779.
</TABLE>
 
FORWARD FOREIGN CURRENCY CONTRACTS OPEN AT JUNE 30, 1997:
 
<TABLE>
<CAPTION>
     CONTRACTS           IN EXCHANGE      DELIVERY     UNREALIZED
    TO DELIVER               FOR            DATE      APPRECIATION
- -------------------------------------------------------------------
<S>                  <C>                  <C>        <C>
        SGD 101,800           $   71,338  07/01/97   $        110
                                                            -----
                                                            -----
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - PACIFIC GROWTH
SUMMARY OF INVESTMENTS JUNE 30, 1997 (UNAUDITED)
<TABLE>
<CAPTION>
                                                        PERCENT OF
INDUSTRY                                     VALUE      NET ASSETS
- ------------------------------------------------------------------
<S>                                       <C>           <C>
Apparel.................................  $    554,712      0.4%
Auto Trucks & Parts.....................        74,346      0.1
Automotive..............................     3,259,153      2.4
Banking.................................    19,203,342     13.9
Banks...................................       310,127      0.2
Building & Construction.................     3,289,583      2.4
Building Materials......................     1,258,972      0.9
Business Services.......................       293,543      0.2
Chemicals...............................     1,122,827      0.8
Chemicals - Specialty...................       405,443      0.3
Commercial Services.....................     2,284,974      1.7
Communications -
  Equipment/Manufacturers...............       447,573      0.3
Computer Equipment......................       179,058      0.1
Computer Software &
  Services..............................       647,819      0.5
Computers...............................       548,953      0.4
Conglomerates...........................    11,471,533      8.3
Construction Plant &
  Equipment.............................     1,075,488      0.8
Currency Options........................        32,400      0.0
Data Processing.........................        52,007      0.0
Diversified Manufacturing...............       379,126      0.3
Electrical Equipment....................       618,807      0.4
Electronic & Electrical Equipment.......     3,883,740      2.8
Electronics.............................     2,431,805      1.8
Electronics -
  Semiconductors/Components.............       204,189      0.1
Electronics - Specialty.................       230,890      0.2
Engineering & Construction..............     1,827,826      1.3
Entertainment...........................     1,001,911      0.7
Finance.................................       119,312      0.1
Financial Services......................     2,189,185      1.6
Food, Beverage, Tobacco & Household
  Products..............................     1,080,254      0.8
Foods & Beverages.......................       646,675      0.5
Forest Products, Paper & Packing........       201,488      0.1
Glass...................................       312,565      0.2
Health & Personal Care..................        82,024      0.1
Industrials.............................       247,400      0.2
Insurance...............................       991,443      0.7
Investment Companies....................     3,338,189      2.4
Leisure.................................     1,844,795      1.3
Machine Tools...........................       458,115      0.3
Machinery...............................     2,284,808      1.7
 
<CAPTION>
                                                        PERCENT OF
INDUSTRY                                     VALUE      NET ASSETS
- ------------------------------------------------------------------
<S>                                       <C>           <C>
Manufacturing...........................  $    655,791      0.5%
Manufacturing - Diversified.............       709,081      0.5
Medical Supplies........................       210,209      0.2
Merchandising...........................        99,476      0.1
Metals..................................     1,218,145      0.9
Metals & Mining.........................     4,282,983      3.1
Metals Non-Ferrous......................       605,244      0.4
Miscellaneous Materials & Commodities...        95,812      0.1
Multi-Industry..........................     1,152,814      0.8
Natural Gas.............................       227,539      0.2
Office Equipment........................       409,599      0.3
Oil Related.............................     2,300,779      1.7
Pharmaceuticals.........................     1,136,068      0.8
Plantation..............................     1,140,936      0.8
Publishing..............................     1,303,672      0.9
Real Estate.............................    22,643,867     16.4
Retail..................................     2,515,070      1.8
Retail - Department Stores..............       295,637      0.2
Retail - Merchandising..................       213,613      0.2
Retail - Specialty......................       170,681      0.1
Retail Stores...........................       519,299      0.4
Shipbuilding............................       106,283      0.1
Shipping................................            12      0.0
Steel...................................       399,667      0.3
Steel & Iron............................     2,220,131      1.6
Telecommunications......................     7,502,837      5.4
Textiles................................       929,361      0.7
Transportation..........................     4,230,664      3.1
Utilities...............................     8,078,908      5.8
Utilities - Electric....................       295,402      0.2
Wholesale & International Trade.........       175,916      0.1
                                          ------------    -----
                                          $136,731,896     99.0%
                                          ------------    -----
                                          ------------    -----
</TABLE>
 
<TABLE>
<CAPTION>
                                                        PERCENT OF
TYPE OF INVESTMENT                           VALUE      NET ASSETS
- ------------------------------------------------------------------
<S>                                       <C>           <C>
Common Stocks...........................  $132,602,222     96.0%
Convertible Bonds.......................     2,908,891      2.1
Foreign Currency Put Options............        32,400      0.0
Preferred Stocks........................       682,550      0.5
Rights & Warrants.......................       505,833      0.4
                                          ------------    -----
                                          $136,731,896     99.0%
                                          ------------    -----
                                          ------------    -----
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - EQUITY
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED)
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
             COMMON STOCKS (97.3%)
             AGRICULTURE RELATED (5.2%)
   155,000   Archer-Daniels-Midland Co...........  $     3,642,500
    70,000   Case Corp...........................        4,821,250
    75,000   Dekalb Genetics Corp. (Class B).....        5,981,250
    76,000   Delta & Pine Land Co................        2,707,500
    30,000   IMC Global, Inc.....................        1,050,000
   200,000   Monsanto Co.........................        8,612,500
    75,000   Pioneer Hi-Bred International,
               Inc...............................        6,000,000
                                                   ---------------
                                                        32,815,000
                                                   ---------------
             APPAREL & FOOTWEAR (0.5%)
    57,900   Jones Apparel Group, Inc.*..........        2,764,725
                                                   ---------------
             AUTO RELATED (0.6%)
   220,000   Miller Industries, Inc.*............        3,520,000
                                                   ---------------
             BANKS (6.9%)
   110,000   BankAmerica Corp....................        7,101,875
   120,000   First of America Bank Corp..........        5,490,000
    30,000   Firstar Corp........................          915,000
    59,400   HomeSide, Inc.*.....................        1,299,375
   155,200   Mellon Bank Corp....................        7,003,400
   100,000   NationsBank Corp....................        6,450,000
    58,000   Norwest Corp........................        3,262,500
   136,000   State Street Corp...................        6,290,000
    58,000   U.S. Bancorp........................        3,719,250
    32,800   Washington Mutual, Inc..............        1,959,800
                                                   ---------------
                                                        43,491,200
                                                   ---------------
             BASIC CYCLICALS (2.3%)
    40,000   Aluminum Co. of America.............        3,015,000
   125,000   Crompton & Knowles Corp.............        2,781,250
    40,000   Du Pont (E.I.) De Nemours & Co.,
               Inc...............................        2,515,000
    60,000   Fuller (H.B.) Co....................        3,300,000
    40,000   Reynolds Metals Co..................        2,850,000
                                                   ---------------
                                                        14,461,250
                                                   ---------------
             BIOTECHNOLOGY (1.8%)
    97,000   Alkermes, Inc.*.....................        1,406,500
   260,000   Biochem Pharma, Inc.*...............        5,752,500
   100,000   Centocor, Inc.*.....................        3,100,000
 
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
 
    19,000   Gilead Sciences, Inc.*..............  $       524,875
    33,000   IDEC Pharmaceuticals Corp.*.........          800,250
                                                   ---------------
                                                        11,584,125
                                                   ---------------
             CAPITAL GOODS (3.2%)
   100,000   General Electric Co.................        6,537,500
    70,000   Honeywell, Inc......................        5,311,250
    70,000   United Technologies Corp............        5,810,000
    90,000   Wyman-Gordon Co.*...................        2,430,000
                                                   ---------------
                                                        20,088,750
                                                   ---------------
             COMMUNICATIONS EQUIPMENT (5.7%)
     6,200   Advanced Fibre Communications,
               Inc.*.............................          374,712
   255,000   Bay Networks, Inc.*.................        6,773,437
   212,000   Brightpoint, Inc.*..................        6,903,250
   165,000   Ericsson (L.M.) Telephone Co. (Class
               B) (ADR) (Sweden).................        6,496,875
    20,000   Lucent Technologies, Inc............        1,441,250
    60,000   Newbridge Networks Corp.
               (Canada)*.........................        2,610,000
    72,000   Northern Telecom Ltd. (Canada)......        6,552,000
    91,000   Tellabs, Inc.*......................        5,073,250
                                                   ---------------
                                                        36,224,774
                                                   ---------------
             COMPUTER EQUIPMENT (3.7%)
    64,000   Dell Computer Corp.*................        7,512,000
   155,000   EMC Corp.*..........................        6,045,000
   150,000   Quantum Corp.*......................        3,046,875
    47,000   SCI Systems, Inc.*..................        2,996,250
   117,000   Seagate Technology, Inc.*...........        4,116,937
                                                   ---------------
                                                        23,717,062
                                                   ---------------
             COMPUTER SERVICES (0.6%)
    60,000   Keane, Inc.*........................        3,120,000
    25,000   Transaction Systems Architects, Inc.
               (Class A)*........................          856,250
                                                   ---------------
                                                         3,976,250
                                                   ---------------
             COMPUTER SOFTWARE (2.5%)
    30,000   BMC Software, Inc.*.................        1,661,250
     5,700   Great Plains Software Inc...........          153,900
    50,000   Microsoft Corp.*....................        6,321,875
   160,000   Veritas Software Corp.*.............        8,000,000
                                                   ---------------
                                                        16,137,025
                                                   ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - EQUITY
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
             CONSTRUCTION (0.5%)
    29,000   American Standard Companies,
               Inc.*.............................  $     1,297,750
    60,000   Miller (Herman), Inc................        2,145,000
                                                   ---------------
                                                         3,442,750
                                                   ---------------
             CONSUMER - NONCYCLICAL (6.4%)
    64,600   Avon Products, Inc..................        4,558,337
    43,000   Clorox Co...........................        5,676,000
    90,000   Coca-Cola Co........................        6,075,000
   100,000   Colgate-Palmolive Co................        6,525,000
    50,000   Gillette Co.........................        4,737,500
    80,000   Kimberly-Clark Corp.................        3,980,000
    80,000   PanAmerican Beverages, Inc. (Class
               A) (Mexico).......................        2,630,000
    45,000   Procter & Gamble Co.................        6,356,250
                                                   ---------------
                                                        40,538,087
                                                   ---------------
             CONSUMER BUSINESS SERVICES (2.1%)
    80,000   Corrections Corp. of
               America*..........................        3,180,000
   100,000   Interpublic Group of Companies,
               Inc...............................        6,131,250
    82,800   Service Corp. International.........        2,722,050
    40,000   U.S.A. Waste Services, Inc.*........        1,545,000
                                                   ---------------
                                                        13,578,300
                                                   ---------------
             CONSUMER PRODUCTS (1.8%)
    73,000   Callaway Golf Co....................        2,591,500
    30,000   CVS Corp............................        1,537,500
   132,000   Kroger Co.*.........................        3,828,000
    38,000   Sony Corp. (ADR) (Japan)............        3,344,000
                                                   ---------------
                                                        11,301,000
                                                   ---------------
             DRUGS (5.6%)
   115,000   Bristol-Myers Squibb Co.............        9,315,000
    59,000   Dura Pharmaceuticals, Inc.*.........        2,345,250
    90,000   Lilly (Eli) & Co....................        9,838,125
    15,000   Pfizer, Inc.........................        1,792,500
    68,000   Schering-Plough Corp................        3,255,500
    70,000   Warner-Lambert Co...................        8,697,500
                                                   ---------------
                                                        35,243,875
                                                   ---------------
             ENERGY (6.3%)
    95,000   Baker Hughes, Inc...................        3,675,312
    80,000   Cooper Cameron Corp.*...............        3,740,000
    61,000   Diamond Offshore Drilling, Inc......        4,765,625
    26,000   ENSCO International, Inc.*..........        1,371,500
    11,900   Falcon Drilling
               Company, Inc.*....................          685,737
   130,300   Global Marine, Inc.*................        3,029,475
 
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
   100,000   Halter Marine Group, Inc.*..........  $     2,400,000
    98,000   Marine Drilling Company, Inc.*......        1,911,000
    86,000   Mobil Corp..........................        6,009,250
    70,000   Schlumberger, Ltd...................        8,750,000
    41,000   Smith International, Inc.*..........        2,490,750
    20,000   Western Atlas, Inc.*................        1,465,000
                                                   ---------------
                                                        40,293,649
                                                   ---------------
             ENTERTAINMENT (0.5%)
   100,000   Electronic Arts, Inc.*..............        3,362,500
                                                   ---------------
             FINANCIAL - MISCELLANEOUS (5.8%)
    30,000   American Express Co.................        2,235,000
   110,000   Associates First Capital Corp.
               (Class A).........................        6,105,000
    22,600   BA Merchant Services, Inc. (Class
               A)*...............................          430,812
    88,000   Bear Stearns Companies, Inc.........        3,008,500
   120,000   Edwards (A.G.), Inc.................        5,130,000
    56,100   Hambrecht & Quist Group*............        1,837,275
    18,300   Infinity Financial Technology,
               Inc.*.............................          297,375
   179,200   Lehman Brothers Holdings, Inc.......        7,257,600
    50,000   Merrill Lynch & Co., Inc............        2,981,250
    76,800   Paine Webber Group, Inc.............        2,688,000
    75,000   PMI Group Inc.......................        4,678,125
                                                   ---------------
                                                        36,648,937
                                                   ---------------
             HEALTHCARE PRODUCTS & SERVICES (3.0%)
   145,000   Health Management Associates, Inc.
               (Class A)*........................        4,132,500
   220,000   Healthsouth Corp.*..................        5,486,250
   130,000   Renal Treatment Centers, Inc.*......        3,493,750
     4,000   Shared Medical
               Systems Corp......................          215,000
   200,000   Tenet Healthcare Corp.*.............        5,912,500
                                                   ---------------
                                                        19,240,000
                                                   ---------------
             HOTELS/MOTELS (0.9%)
    75,000   MGM Grand, Inc.*....................        2,775,000
   200,000   Sodak Gaming, Inc.*.................        2,925,000
                                                   ---------------
                                                         5,700,000
                                                   ---------------
             INSURANCE (3.7%)
    64,000   Allstate Corp.+.....................        4,672,000
   130,000   Equitable Companies, Inc............        4,322,500
    50,000   Fremont General Corp................        2,012,500
    25,000   General Re Corp.....................        4,550,000
   109,800   Hartford Life, Inc. (Class A)*......        4,117,500
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - EQUITY
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
    42,000   Marsh & McLennan Companies, Inc.....  $     2,997,750
    32,500   Nationwide Financial Services, Inc.
               (Class A).........................          863,281
                                                   ---------------
                                                        23,535,531
                                                   ---------------
             INTERNET (1.1%)
   120,000   America Online, Inc.*...............        6,675,000
    15,000   Security Dynamics Technologies,
               Inc.*.............................          551,250
                                                   ---------------
                                                         7,226,250
                                                   ---------------
             MEDIA GROUP (5.9%)
    61,600   Clear Channel Communications,
               Inc.*.............................        3,788,400
    67,500   Evergreen Media Corp. (Class A)*....        3,003,750
   100,000   Heftel Broadcasting Corp. (Class
               A)*...............................        5,450,000
    61,000   Lin Television Corp.*...............        2,687,812
   121,125   Outdoor Systems, Inc.*..............        4,602,750
   120,000   Time Warner, Inc....................        5,790,000
   135,000   Tribune Co..........................        6,488,438
    66,600   Univision Communications, Inc.
               (Class A)*........................        2,605,725
   121,410   Westinghouse Electric Corp..........        2,807,606
                                                   ---------------
                                                        37,224,481
                                                   ---------------
             MEDICAL SUPPLIES (1.0%)
    42,000   Guidant Corp........................        3,570,000
   100,000   Mentor Corp.........................        2,962,500
                                                   ---------------
                                                         6,532,500
                                                   ---------------
             RETAIL (5.7%)
    26,600   Barnes & Noble, Inc.*...............        1,143,800
   130,000   Costco Companies Inc.*..............        4,273,750
   120,000   Dayton-Hudson Corp..................        6,382,500
   215,000   Family Dollar Stores, Inc...........        5,858,750
   150,000   General Nutrition Companies,
               Inc.*.............................        4,181,250
    75,000   Home Depot, Inc.....................        5,170,313
    56,000   Tiffany & Co........................        2,586,500
   185,000   Wal-Mart Stores, Inc................        6,255,313
                                                   ---------------
                                                        35,852,176
                                                   ---------------
 
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
 
             SEMICONDUCTOR CAPITAL EQUIPMENT (6.0%)
   100,000   Applied Materials, Inc.*............  $     7,075,000
   105,000   DuPont Photomasks, Inc.*............        5,663,438
   150,000   Etec Systems, Inc.*.................        6,421,875
   250,000   KLA-Tencor Corp.*...................       12,187,500
   185,000   PRI Automation, Inc.*...............        7,006,875
                                                   ---------------
                                                        38,354,688
                                                   ---------------
             SEMICONDUCTORS (6.4%)
   230,000   Analog Devices, Inc.*...............        6,109,375
    37,000   Intel Corp..........................        5,237,813
    50,000   Lattice Semiconductor Corp.*........        2,818,750
   150,000   LSI Logic Corp.*....................        4,800,000
   195,000   MEMC Electronic Materials, Inc.*....        6,386,250
    51,000   Micrel, Inc.*.......................        2,575,500
    70,000   Micron Technology, Inc.*............        2,795,625
     3,500   Rambus Inc.*........................          161,438
    80,000   Texas Instruments, Inc..............        6,725,000
    95,000   Vitesse Semiconductor Corp.*........        3,099,375
                                                   ---------------
                                                        40,709,126
                                                   ---------------
             TRANSPORTATION (1.6%)
    45,000   Cummins Engine Co., Inc.............        3,175,313
    41,600   OMI Corp.*..........................          397,800
     5,100   Ryanair Holdings PLC (Ireland)
               (ADR)*............................          137,063
    15,000   Teekay Shipping Corp................          518,438
   178,750   US Airways Group Inc.*..............        6,125,037
                                                   ---------------
                                                        10,353,651
                                                   ---------------
 
             TOTAL COMMON STOCKS
             (IDENTIFIED COST $508,820,953)......      617,917,662
                                                   ---------------
</TABLE>
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN
 THOUSANDS
- -----------
<C>          <S>                                   <C>
             SHORT-TERM INVESTMENTS (2.6%)
             U.S. GOVERNMENT AGENCY (a) (2.5%)
 $  16,000   Federal Home Loan Mortgage Corp.
               6.00% due 07/01/97 (Amortized Cost
               $16,000,000)......................       16,000,000
                                                   ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - EQUITY
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN
 THOUSANDS                                              VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
             REPURCHASE AGREEMENT (0.1%)
 $     227   The Bank of New York 5.75% due
               07/01/97 (dated 06/30/97; proceeds
               $227,060; collateralized by
               $49,342 U.S.Treasury Bill 0.00%
               due 04/30/98 valued at $47,137;
               $60,000 U.S. Treasury Bond 11.75%
               due 02/15/01 valued at $73,026;
               $70,000 U.S. Treasury Note 5.50%
               due 07/31/97 valued at $71,606 and
               $39,237 U.S. Treasury Note 6.25%
               due 02/15/03 valued at $39,796)
               (Identified Cost $227,024)........  $       227,024
                                                   ---------------
 
             TOTAL SHORT-TERM INVESTMENTS
             (IDENTIFIED COST $16,227,024).......       16,227,024
                                                   ---------------
 
TOTAL INVESTMENTS
(IDENTIFIED COST
$525,047,977) (B)...........       99.9%   634,144,686
 
OTHER ASSETS IN EXCESS OF
LIABILITIES.................        0.1        844,002
                                  -----   ------------
 
NET ASSETS..................      100.0%  $634,988,688
                                  -----   ------------
                                  -----   ------------
 
<FN>
- ---------------------
ADR  American Depository Receipt.
 *   Non-income producing security.
 +   Parent Company of Northbrook Life Insurance Company and Allstate Life
     Insurance Company of New York, affiliates of the Fund.
(a)  Security was purchased on a discount basis. The interest rate shown has
     been adjusted to reflect a money market equivalent yield.
(b)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation is $115,249,503 and the
     aggregate gross unrealized depreciation is $6,152,794, resulting in net
     unrealized appreciation of $109,096,709.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - STRATEGIST
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED)
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
             COMMON AND PREFERRED STOCKS (59.1%)
             AEROSPACE & DEFENSE (2.4%)
    77,000   Honeywell, Inc......................  $     5,842,375
   183,300   Watkins-Johnson Co..................        5,636,475
                                                   ---------------
                                                        11,478,850
                                                   ---------------
             ALUMINUM (1.3%)
    78,000   Aluminum Co. of America.............        5,879,250
                                                   ---------------
             AUTOMOTIVE (2.5%)
   184,000   Chrysler Corp.......................        6,037,500
   156,000   Ford Motor Co.......................        5,889,000
                                                   ---------------
                                                        11,926,500
                                                   ---------------
             BANKS - MONEY CENTER (2.4%)
    47,000   Citicorp............................        5,666,437
    54,000   Morgan (J.P.) & Co., Inc............        5,636,250
                                                   ---------------
                                                        11,302,687
                                                   ---------------
             BEVERAGES - SOFT DRINKS (1.2%)
   155,000   PepsiCo, Inc........................        5,822,187
                                                   ---------------
             CHEMICALS (1.4%)
   155,000   Monsanto Co.........................        6,674,687
                                                   ---------------
             COMPUTER EQUIPMENT (2.3%)
    88,000   Cisco Systems, Inc.*................        5,907,000
   144,000   Seagate Technology, Inc.*...........        5,067,000
                                                   ---------------
                                                        10,974,000
                                                   ---------------
             COMPUTER SOFTWARE (2.4%)
    44,000   Microsoft Corp.*....................        5,563,250
   112,000   Oracle Corp.*.......................        5,635,000
                                                   ---------------
                                                        11,198,250
                                                   ---------------
             COMPUTERS (1.2%)
   170,000   Gateway 2000, Inc.*.................        5,514,375
                                                   ---------------
             COMPUTERS - SYSTEMS (3.8%)
   140,000   Diebold, Inc........................        5,460,000
   110,000   Hewlett-Packard Co. ................        6,160,000
   167,000   Sun Microsystems, Inc.*.............        6,210,312
                                                   ---------------
                                                        17,830,312
                                                   ---------------
             ELECTRIC - MAJOR (1.3%)
    90,000   General Electric Co. ...............        5,883,750
                                                   ---------------
             ELECTRONICS - SEMICONDUCTORS/COMPONENTS (1.2%)
    40,000   Intel Corp..........................        5,662,500
                                                   ---------------
             ENTERTAINMENT/GAMING & LODGING (1.2%)
   225,000   Circus Circus Enterprises,
               Inc.*.............................        5,540,625
                                                   ---------------
 
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
             FINANCIAL SERVICES (1.2%)
   128,000   Fannie Mae..........................  $     5,584,000
                                                   ---------------
             FOODS (2.6%)
   121,000   Campbell Soup Co....................        6,050,000
    92,000   General Mills, Inc..................        5,991,500
                                                   ---------------
                                                        12,041,500
                                                   ---------------
             FOREST PRODUCTS, PAPER & PACKING (1.4%)
   147,000   Bowater Inc.........................        6,798,750
                                                   ---------------
             HEALTHCARE - HMOS (1.2%)
   250,000   Humana, Inc.*.......................        5,781,250
                                                   ---------------
             HOUSEHOLD PRODUCTS (1.3%)
    92,000   Colgate-Palmolive Co................        6,003,000
                                                   ---------------
             HOUSEWARES (1.2%)
   150,000   Tupperware Corp.....................        5,475,000
                                                   ---------------
             MEDICAL PRODUCTS & SUPPLIES (1.2%)
   110,000   Baxter International, Inc...........        5,747,500
                                                   ---------------
             OIL - DOMESTIC (1.2%)
    80,000   Atlantic Richfield Co...............        5,640,000
                                                   ---------------
             OIL INTEGRATED - INTERNATIONAL (2.4%)
    93,000   Exxon Corp..........................        5,719,500
    53,000   Texaco, Inc.........................        5,763,750
                                                   ---------------
                                                        11,483,250
                                                   ---------------
             PHARMACEUTICALS (5.1%)
    76,000   American Home Products   Corp.......        5,814,000
    90,600   Johnson & Johnson...................        5,832,375
    55,000   Lilly (Eli) & Co....................        6,012,188
    53,000   Pfizer, Inc.........................        6,333,500
                                                   ---------------
                                                        23,992,063
                                                   ---------------
             PROPERTY - CASUALTY INSURANCE (1.4%)
     7,490   Aetna Inc. (Class C) (Conv.   Pref.)
             $4.75...............................          702,188
    89,000   Chubb Corp..........................        5,951,875
                                                   ---------------
                                                         6,654,063
                                                   ---------------
             RETAIL (1.3%)
   113,000   Dayton-Hudson Corp..................        6,010,188
                                                   ---------------
             RETAIL - SPECIALTY (4.0%)
   200,000   Bed Bath & Beyond, Inc.*............        6,075,000
    89,000   Home Depot, Inc.....................        6,135,438
   122,000   Payless ShoeSource, Inc.*...........        6,671,875
                                                   ---------------
                                                        18,882,313
                                                   ---------------
             RETAIL - SPECIALTY APPAREL (1.3%)
   160,000   Gap, Inc............................        6,220,000
                                                   ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - STRATEGIST
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
             SAVINGS & LOAN ASSOCIATIONS (1.2%)
    83,000   Golden West Financial Corp..........  $     5,810,000
                                                   ---------------
             SEMICONDUCTOR EQUIPMENT (2.5%)
   118,000   Altera Corp.*.......................        5,959,000
   120,000   KLA-Tencor Corp.*...................        5,850,000
                                                   ---------------
                                                        11,809,000
                                                   ---------------
             SHOES (1.4%)
   113,000   Nike, Inc. (Class B)................        6,596,375
                                                   ---------------
             STEEL & IRON (1.3%)
   104,000   Nucor Corp. ........................        5,876,000
                                                   ---------------
             TELECOMMUNICATION EQUIPMENT (1.3%)
   112,600   Tellabs, Inc.*......................        6,277,450
                                                   ---------------
 
             TOTAL COMMON AND PREFERRED STOCKS
             (IDENTIFIED COST $212,746,300)......      278,369,675
                                                   ---------------
</TABLE>
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN
 THOUSANDS
- -----------
<C>          <S>                                   <C>
             CORPORATE BONDS (14.3%)
             AIRLINES (1.3%)
 $   3,250   AMR Corp.
             10.45% due 03/10/11.................        4,012,157
     1,612   United Air Lines, Inc.
             10.125% due 03/22/15................        1,925,002
                                                   ---------------
                                                         5,937,159
                                                   ---------------
             BANKS (1.7%)
     3,000   Bankers Trust - 144A **   (Series A)
             8.09% due 12/01/26..................        2,938,680
     3,000   Capital One Bank
             8.125% due 03/01/00.................        3,082,200
     2,000   National City Capital Trust -
               144A**
             6.75% due 06/01/99..................        2,010,000
                                                   ---------------
                                                         8,030,880
                                                   ---------------
             BROKERAGE (0.5%)
     2,500   Salomon Inc.
             6.70% due 07/05/00..................        2,492,250
                                                   ---------------
 
<CAPTION>
 PRINCIPAL
 AMOUNT IN
 THOUSANDS                                              VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
             CABLE & TELECOMMUNICATIONS (0.9%)
 $   2,000   Comcast Cable   Communication -
             144A**
             8.875% due 05/01/17.................  $     2,173,180
     2,000   TCI Communications, Inc.
             8.75% due 08/01/15..................        2,099,580
                                                   ---------------
                                                         4,272,760
                                                   ---------------
             FINANCE (0.5%)
     2,000   Terra Nova Holdings
             (United Kingdom)
             10.75% due 07/01/05.................        2,222,280
                                                   ---------------
             FINANCE - CONSUMER (1.9%)
     3,000   Advanta National Bank
             5.98% due 02/10/98..................        2,988,750
     3,000   Money Store Inc. (The)
             8.375% due 04/15/04.................        3,076,950
     3,000   Riggs Capital Trust II -   144A**
             (Series C)
             8.875% due 03/15/27.................        3,046,440
                                                   ---------------
                                                         9,112,140
                                                   ---------------
             FINANCIAL SERVICES (3.0%)
     2,000   Arkwright CSN Trust -   144A**
             9.625% due 08/15/26.................        2,235,000
     3,000   Central Fidelity Capital I -
               144A**
             6.832% due 04/15/27.................        3,077,730
     3,000   Centura Capital Trust I -   144A**
             8.845% due 06/01/27.................        3,097,500
     3,000   Provident Capital Trust I
             8.60% due 12/01/26..................        2,988,750
     3,000   Sakura Capital Funding -   144A**
             (Cayman Islands)
             7.32% due 08/29/49..................        2,958,750
                                                   ---------------
                                                        14,357,730
                                                   ---------------
             FOREIGN GOVERNMENT & AGENCY (0.8%)
     1,000   Quebec Province (Canada)
             6.89% due 04/15/26..................        1,010,740
     3,000   Republic of South Africa   (South
             Africa)
             8.50% due 06/23/17..................        2,998,380
                                                   ---------------
                                                         4,009,120
                                                   ---------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - STRATEGIST
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN
 THOUSANDS                                              VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
             INSURANCE (1.3%)
 $   2,000   Farmers Insurance   Exchange -
             144A**
             8.50% due 08/01/04..................  $     2,105,000
     4,000   Vesta Capital Trust I - 144A**
             8.525% due 01/15/27.................        4,065,000
                                                   ---------------
                                                         6,170,000
                                                   ---------------
             MACHINERY & MACHINE TOOLS (0.5%)
     2,000   Reliance Industries Ltd. -   144A**
             (India)
             10.25% due 01/15/97.................        2,170,520
                                                   ---------------
             METALS & MINING (0.4%)
     2,000   Placer Dome, Inc. (Canada)
             8.50% due 12/31/45..................        1,942,500
                                                   ---------------
             OIL INTEGRATED - DOMESTIC (0.4%)
     1,950   Mitchell Energy &   Development
             Corp.
             6.75% due 02/15/04..................        1,887,581
                                                   ---------------
             TELECOMMUNICATIONS (1.1%)
     2,000   British Telecom Finance   (United
             Kingdom)
             9.625% due 02/15/19.................        2,170,820
     3,000   Total Access Communication -
               144A** (Thailand)
             8.375% due 11/04/06.................        2,928,750
                                                   ---------------
                                                         5,099,570
                                                   ---------------
 
             TOTAL CORPORATE BONDS
             (IDENTIFIED COST $67,289,516).......       67,704,490
                                                   ---------------
</TABLE>
<TABLE>
<CAPTION>
<C>          <S>                                   <C>
             U.S. GOVERNMENT OBLIGATIONS (6.7%)
     3,000   U.S. Treasury Bond
             6.50% due 11/15/26..................        2,876,670
     3,000   U.S. Treasury Note
             5.125% due 02/28/98.................        2,988,690
    10,000   U.S. Treasury Note
             5.25% due 12/31/97..................        9,986,700
     1,000   U.S. Treasury Note
             5.625% due 11/30/00.................          979,610
     2,000   U.S. Treasury Note
             6.375% due 05/15/99.................        2,010,280
       500   U.S. Treasury Note
             6.50% due 04/30/99..................          503,860
     3,000   U.S. Treasury Note
             6.50% due 05/15/05..................        2,994,930
     4,000   U.S. Treasury Note
             6.875% due 08/31/99.................        4,060,160
 
<CAPTION>
 PRINCIPAL
 AMOUNT IN
 THOUSANDS                                              VALUE
- ------------------------------------------------------------------
<C>          <S>                                   <C>
 $   5,000   U.S. Treasury Note
             6.875% due 03/31/00.................  $     5,081,850
                                                   ---------------
 
             TOTAL U.S. GOVERNMENT OBLIGATIONS
             (IDENTIFIED COST $31,715,313).......       31,482,750
                                                   ---------------
</TABLE>
 
<TABLE>
<CAPTION>
<C>          <S>                                   <C>
             SHORT-TERM INVESTMENTS (a) (19.5%)
             U.S. GOVERNMENT AGENCIES
    23,255   Federal Home Loan Banks
             5.40% due 07/14/97..................       23,209,653
    50,000   Federal Home Loan Mortgage   Corp.
             5.42% due 07/03/97..................       49,984,944
    11,550   Federal Home Loan Mortgage   Corp.
             6.00% due 07/01/97..................       11,550,000
     7,000   Federal National Mortgage   Assoc.
             5.40% due 07/03/97..................        6,997,900
                                                   ---------------
 
             TOTAL SHORT-TERM   INVESTMENTS
             (IDENTIFIED COST
             $91,742,497)........................       91,742,497
                                                   ---------------
 
TOTAL INVESTMENTS
  (IDENTIFIED COST
  $403,493,626) (B).........       99.6%   469,299,412
 
CASH AND OTHER ASSETS IN
  EXCESS OF LIABILITIES.....        0.4      1,669,628
                                  -----   ------------
 
NET ASSETS..................      100.0%  $470,969,040
                                  -----   ------------
                                  -----   ------------
 
<FN>
- ---------------------
 *   Non-income producing security.
**   Resale is restricted to qualified institutional investors.
(a)  Securities were purchased on a discount basis. The interest rates shown
     have been adjusted to reflect a money market equivalent yield.
(b)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation is $68,331,756 and the
     aggregate gross unrealized depreciation is $2,525,970, resulting in net
     unrealized appreciation of $65,805,786.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - CAPITAL APPRECIATION
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED)
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                 VALUE
- -------------------------------------------------------------------
<C>          <S>                                     <C>
             COMMON STOCKS (95.0%)
             ADVERTISING (1.2%)
     6,100   Snyder Communications, Inc.*..........  $      164,319
                                                     --------------
             AEROSPACE & DEFENSE (1.3%)
    12,100   Kellstrom Industries, Inc.*...........         189,062
                                                     --------------
             AUTO PARTS - ORIGINAL EQUIPMENT (1.4%)
     4,600   Tower Automotive, Inc.*...............         197,800
                                                     --------------
             BIOTECHNOLOGY (3.5%)
     5,300   Centocor, Inc.*.......................         164,300
     5,200   Guilford Pharmaceuticals, Inc.*.......         126,100
     7,300   Interneuron Pharmaceuticals, Inc.*....         146,912
     6,500   Liposome Co., Inc.*...................          57,687
                                                     --------------
                                                            494,999
                                                     --------------
             BUSINESS SERVICES (1.3%)
     5,700   Metzler Group, Inc.*..................         182,400
                                                     --------------
             COMMERCIAL SERVICES (4.9%)
     6,000   Caribiner International, Inc.*........         195,750
     5,100   Learning Tree International, Inc......         226,312
     9,600   Whittman-Hart, Inc....................         270,000
                                                     --------------
                                                            692,062
                                                     --------------
             COMPUTER EQUIPMENT (1.3%)
     4,100   Storage Technology Corp.*.............         182,450
                                                     --------------
             COMPUTER SOFTWARE (3.2%)
     3,000   American Software, Inc. (Class A).....          22,500
     4,400   Compuware Corp.*......................         210,100
     8,600   Systems & Computer Technology
               Corp.*..............................         227,900
                                                     --------------
                                                            460,500
                                                     --------------
             COMPUTER SOFTWARE & SERVICES (11.0%)
     6,800   Harbinger Corp.*......................         190,400
     9,200   ISG International Software Group Ltd.*
               (Israel)............................         116,150
     4,400   Keane, Inc............................         228,800
     7,800   Manugistics Group, Inc.*..............         347,100
     5,400   PRI Automation, Inc.*.................         204,525
     7,200   Scopus Technology, Inc.*..............         160,200
     4,500   SMART Modular Technologies, Inc.*.....         151,875
     5,200   STB Systems, Inc.*....................         166,400
                                                     --------------
                                                          1,565,450
                                                     --------------
             COMPUTERS (4.9%)
     7,800   Data General Corp.*...................         202,800
     6,200   Gulfstream Aerospace Corp.*...........         182,900
     7,500   Micron Electronics, Inc.*.............         133,594
     4,300   MICROS Systems, Inc.*.................         178,987
                                                     --------------
                                                            698,281
                                                     --------------
 
<CAPTION>
 NUMBER OF
  SHARES                                                 VALUE
- -------------------------------------------------------------------
<C>          <S>                                     <C>
             CONSUMER SERVICES (1.3%)
     9,500   E*TRADE Group, Inc.*..................  $      185,844
                                                     --------------
             ELECTRICAL EQUIPMENT (2.0%)
     8,200   JPM Co.*..............................         291,100
                                                     --------------
             ELECTRONICS (5.3%)
     5,400   Sawtek, Inc.*.........................         180,900
     5,200   Sipex Corp.*..........................         182,000
     5,600   Teradyne, Inc.*.......................         219,800
     5,000   Vitesse Semiconductor Corp.*..........         163,125
                                                     --------------
                                                            745,825
                                                     --------------
             ELECTRONICS - SEMICONDUCTORS/COMPONENTS (4.9%)
     4,700   CFM Technologies, Inc.*...............         153,337
     4,500   Etec Systems, Inc.*...................         192,656
     5,700   Kulicke & Soffa Industries, Inc.*.....         184,181
     5,000   TriQuint Semiconductor, Inc.*.........         170,000
                                                     --------------
                                                            700,174
                                                     --------------
             ENVIRONMENTAL CONTROL (2.4%)
     4,000   Culligan Water Technologies, Inc.*....         179,000
     4,300   U.S.A Waste Services, Inc.*...........         166,088
                                                     --------------
                                                            345,088
                                                     --------------
             FOOD PROCESSING (1.1%)
     6,300   International Multifoods Corp.........         158,288
                                                     --------------
             HOSPITAL RELATED (1.2%)
     5,200   Genesis Health Ventures, Inc..........         175,500
                                                     --------------
             INSURANCE (1.3%)
     5,900   Penn Treaty American Corp.*...........         180,688
                                                     --------------
             LEISURE (1.3%)
    10,000   Funco, Inc.*..........................         185,000
                                                     --------------
             MACHINERY (1.7%)
     4,300   National-Oilwell, Inc.*...............         247,250
                                                     --------------
             MANUFACTURING (1.4%)
    11,200   Ballantyne of Omaha, Inc.*............         201,600
                                                     --------------
             MEDICAL PRODUCTS & SUPPLIES (1.6%)
    16,600   Graham-Field Health Products, Inc.....         226,175
                                                     --------------
             MISCELLANEOUS (3.7%)
     5,400   Immunex Corp.*........................         194,400
     3,200   Innovex, Inc..........................          92,400
     8,000   ITEQ, Inc.*...........................          75,000
     5,400   Scotts Company (The) (Class A)*.......         156,600
                                                     --------------
                                                            518,400
                                                     --------------
             OIL & GAS (2.4%)
     8,800   Lomak Petroleum, Inc..................         156,750
     8,100   Noble Drilling Corp.*.................         182,756
                                                     --------------
                                                            339,506
                                                     --------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - CAPITAL APPRECIATION
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                 VALUE
- -------------------------------------------------------------------
<C>          <S>                                     <C>
             OIL EQUIPMENT & SERVICES (1.2%)
     3,300   ENSCO International, Inc.*............  $      174,075
                                                     --------------
             PHARMACEUTICALS (2.7%)
     7,600   Alkermes, Inc.*.......................         110,200
     7,700   North American Vaccine, Inc...........         148,706
     5,800   SangStat Medical Corp.*...............         130,500
                                                     --------------
                                                            389,406
                                                     --------------
             PUBLISHING (1.3%)
     7,900   Valassis Communications, Inc.*........         189,600
                                                     --------------
             RETAIL (5.4%)
     8,800   Claire's Stores, Inc..................         154,000
     9,400   Michaels Stores, Inc.*................         199,163
     6,400   Ross Stores, Inc......................         208,800
     6,700   Stein Mart, Inc.*.....................         201,000
                                                     --------------
                                                            762,963
                                                     --------------
             RETAIL - SPECIALTY (3.2%)
     5,300   Cole National Corp. (Class A)*........         233,200
     6,175   Consolidated Stores Corp.*............         214,581
                                                     --------------
                                                            447,781
                                                     --------------
             SEMICONDUCTORS (1.3%)
     3,900   KLA-Tencor Corp.*.....................         190,125
                                                     --------------
             SPECIALIZED SERVICES (1.2%)
     5,300   Service Corp. International...........         174,238
                                                     --------------
             TELECOMMUNICATION EQUIPMENT (5.6%)
     7,400   Davox Corp.*..........................         264,088
     6,400   Digital Microwave Corp.*..............         187,200
     7,800   DSC Communications Corp.*.............         173,550
     5,000   P-COM, Inc.*..........................         163,750
                                                     --------------
                                                            788,588
                                                     --------------
             TELECOMMUNICATIONS (4.0%)
     2,900   QUALCOMM, Inc.*.......................         147,538
    10,500   Tel-Save Holdings, Inc.*..............         158,813
     8,200   Telco Communications Group, Inc.*.....         264,450
                                                     --------------
                                                            570,801
                                                     --------------
             TRANSPORTATION (0.9%)
     6,100   Trico Marine Service, Inc.*...........         133,056
                                                     --------------
             TRUCKERS (1.5%)
     5,600   Caliber System, Inc...................         208,600
                                                     --------------
             WHOLESALE DISTRIBUTOR (1.1%)
    10,700   ADFlex Solutions, Inc.*...............         160,500
                                                     --------------
 
             TOTAL COMMON STOCKS
             (IDENTIFIED COST $12,302,618).........      13,517,494
                                                     --------------
</TABLE>
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN
 THOUSANDS                                               VALUE
- -------------------------------------------------------------------
<C>          <S>                                     <C>
             SHORT-TERM INVESTMENTS (7.9%)
             U.S. GOVERNMENT AGENCY (a) (7.0%)
 $   1,000   Federal Home Loan Mortgage Corp. 6.00%
               due 07/01/97 (Amortized Cost
               $1,000,000).........................  $    1,000,000
                                                     --------------
 
             REPURCHASE AGREEMENT (0.9%)
       124   The Bank of New York 5.75% due
               07/01/97 (dated 06/30/97; proceeds
               $124,372; collateralized by $40,000
               U.S. Treasury Bond 7.25% due
               08/15/22 valued at $42,763; $10,591
               U.S. Treasury Note 7.50% due
               10/31/99 valued at $11,019; $30,000
               U.S. Treasury Note 7.75% due
               11/30/99 valued at $31,222; $35,000
               U.S. Treasury Note 8.125% due
               02/15/98 valued at $36,569 and
               $5,221 U.S. Treasury Note 6.265% due
               06/30/01 valued at $5,266
               (Identified Cost $124,352)..........         124,352
                                                     --------------
 
             TOTAL SHORT-TERM
             INVESTMENTS
             (IDENTIFIED COST $1,124,352)..........       1,124,352
                                                     --------------
 
TOTAL INVESTMENTS
  (IDENTIFIED COST
$13,426,970) (B).............      102.9%   14,641,846
 
LIABILITIES IN EXCESS OF
OTHER
  ASSETS.....................       (2.9)     (414,457)
                                   -----   -----------
 
NET ASSETS...................      100.0%  $14,227,389
                                   -----   -----------
                                   -----   -----------
 
<FN>
- ---------------------
 *   Non-income producing security.
(a)  Security was purchased on a discount basis. The interest rate shown has
     been adjusted to reflect a money market equivalent yield.
(b)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation is $1,597,008 and the
     aggregate gross unrealized depreciation is $382,132, resulting in net
     unrealized appreciation of $1,214,876.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - INCOME BUILDER
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED)
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                 VALUE
- -------------------------------------------------------------------
<C>          <S>                                     <C>
             COMMON STOCKS (44.9%)
             APPAREL (0.8%)
     6,000   Kellwood Co...........................  $      166,500
                                                     --------------
             AUTO PARTS (0.8%)
     4,400   Dana Corp.............................         167,200
                                                     --------------
             AUTOMOTIVE (2.4%)
     5,000   Chrysler Corp.........................         164,062
     4,200   Ford Motor Co.........................         158,550
     3,000   General Motors Corp...................         167,062
                                                     --------------
                                                            489,674
                                                     --------------
             BANKS (4.9%)
     3,000   CoreStates Financial Corp.............         161,250
     6,050   First Security Corp...................         165,241
     3,300   First Tennessee National Corp.........         158,400
     2,900   KeyCorp...............................         162,037
     6,280   Washington Federal, Inc...............         160,925
     3,600   Wilmington Trust Corp.................         164,700
                                                     --------------
                                                            972,553
                                                     --------------
             BANKS - THRIFT INSTITUTIONS (0.8%)
     2,600   Washington Mutual, Inc................         155,350
                                                     --------------
             BUILDING MATERIALS (0.8%)
     2,100   Vulcan Materials Co...................         164,850
                                                     --------------
             CHEMICALS (3.4%)
     1,900   Dow Chemical Co.......................         165,537
     3,500   Hercules, Inc.........................         167,562
     2,900   PPG Industries, Inc...................         168,562
     1,900   Rohm & Haas Co........................         171,119
                                                     --------------
                                                            672,780
                                                     --------------
             CONGLOMERATES (0.8%)
     3,700   Tenneco, Inc..........................         167,194
                                                     --------------
             FINANCIAL (1.2%)
     2,400   Providian Financial Corp.*............          77,100
     3,300   TCF Financial Corp....................         162,937
                                                     --------------
                                                            240,037
                                                     --------------
             FINANCIAL - MISCELLANEOUS (1.7%)
     3,900   Fannie Mae............................         170,138
     1,300   Student Loan Marketing Assoc..........         165,100
                                                     --------------
                                                            335,238
                                                     --------------
             FOOD PROCESSING (0.8%)
     6,000   Hormel Foods Corp.....................         161,250
                                                     --------------
             HEALTHCARE - DRUGS (0.8%)
     3,400   Schering-Plough Corp..................         162,775
                                                     --------------
             INSURANCE (2.5%)
     2,300   Jefferson-Pilot Corp..................         160,713
     2,600   Lincoln National Corp.................         167,375
     2,300   Torchmark Corp........................         163,875
                                                     --------------
                                                            491,963
                                                     --------------
 
<CAPTION>
 NUMBER OF
  SHARES                                                 VALUE
- -------------------------------------------------------------------
<C>          <S>                                     <C>
             LIFE INSURANCE (0.4%)
     1,042   Aegon N.V. (Netherlands)..............  $       73,005
                                                     --------------
             MACHINERY - DIVERSIFIED (0.8%)
     4,000   Johnson Controls, Inc.................         164,250
                                                     --------------
             MANUFACTURING - CONSUMER & INDUSTRIAL PRODUCTS (0.8%)
     3,000   Whirlpool Corp........................         163,688
                                                     --------------
             MISCELLANEOUS (0.9%)
     4,600   American Greetings Corp.
             (Class A).............................         170,200
                                                     --------------
             MOBIL HOME & RECREATION (0.8%)
     5,500   Fleetwood Enterprises, Inc............         163,969
                                                     --------------
             OIL & GAS (0.8%)
     3,600   Ashland, Inc..........................         166,950
                                                     --------------
             REAL ESTATE INVESTMENT TRUST (7.0%)
     8,000   American General Hospitality
             Corp..................................         198,000
     2,700   Boston Properties, Inc.*..............          74,250
     7,800   Excel Realty Trust, Inc...............         205,725
     8,200   Glenborough Realty Trust Inc..........         207,050
     3,750   Healthcare Realty Trust, Inc..........         104,531
     9,200   Liberty Property Trust................         228,850
     9,800   LTC Properties, Inc...................         177,625
     9,000   Reckson Associates Realty
             Corp..................................         207,000
                                                     --------------
                                                          1,403,031
                                                     --------------
             RESTAURANTS (0.8%)
     5,900   Sbarro, Inc...........................         163,725
                                                     --------------
             RETAIL - SPECIALTY APPAREL (0.8%)
     8,300   Limited (The), Inc....................         168,075
                                                     --------------
             STEEL (0.9%)
     4,900   USX-U.S. Steel Group, Inc.............         171,806
                                                     --------------
             TELECOMMUNICATIONS (1.7%)
     2,200   Bell Atlantic Corp....................         166,925
     4,600   U.S. West Communications
             Group, Inc............................         173,363
                                                     --------------
                                                            340,288
                                                     --------------
             TELEPHONES (0.8%)
     4,700   AT&T Corp.............................         164,794
                                                     --------------
             TOBACCO (1.7%)
     4,000   Philip Morris Companies, Inc..........         177,500
     6,000   UST, Inc..............................         166,500
                                                     --------------
                                                            344,000
                                                     --------------
             UTILITIES - ELECTRIC (3.4%)
     5,700   Consolidated Edison Co. of New
             York, Inc.............................         167,794
     4,500   New England Electric System...........         166,500
     8,200   PECO Energy Co........................         172,200
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - INCOME BUILDER
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                 VALUE
- -------------------------------------------------------------------
<C>          <S>                                     <C>
     6,700   Public Service Enterprise
             Group, Inc............................  $      167,500
                                                     --------------
                                                            673,994
                                                     --------------
             UTILITIES - TELEPHONE (0.8%)
     3,700   GTE Corp..............................         162,338
                                                     --------------
             WHOLESALE DISTRIBUTOR (0.8%)
     4,500   Supervalu, Inc........................         155,250
                                                     --------------
             TOTAL COMMON STOCKS
             (IDENTIFIED COST $8,402,618)..........       8,996,727
                                                     --------------
             CONVERTIBLE PREFERRED STOCKS (16.3%)
             AUTO PARTS (0.5%)
     3,700   Walbro Capital Trust $2.00............         105,912
                                                     --------------
             BANKS (0.7%)
     5,000   National Australia Bank, Ltd.
             $1.969 (Australia) (Units)++..........         139,687
                                                     --------------
             BROADCAST MEDIA (2.8%)
     4,200   Evergreen Media Corp. -
             144A** $3.00..........................         229,162
     5,500   SFX Broadcasting, Inc.
             (Series D) $3.25......................         302,500
     4,000   Triathlon Broadcasting Co.
             $0.945................................          34,000
                                                     --------------
                                                            565,662
                                                     --------------
             CHEMICALS (2.2%)
     6,300   Atlantic Richfield Co. $2.228.........         135,450
     5,000   Occidental Petroleum Corp.
             (Series 1993) $3.875 -
             144A**................................         294,065
                                                     --------------
                                                            429,515
                                                     --------------
             FINANCE (2.6%)
     6,890   Insignia Financing, Inc. $3.25........         316,079
     2,540   Merrill Lynch & Co., Inc.
             (STRYPES) $2.39 (1)...................          95,250
     1,500   Merrill Lynch & Co., Inc.
             (STRYPES) $4.087 (2)..................         102,750
                                                     --------------
                                                            514,079
                                                     --------------
             INSURANCE (1.0%)
     3,500   American Heritage Life
             Investment Corp. $4.25................         192,500
                                                     --------------
             METALS & MINING (0.5%)
     1,740   Cyprus Amax Minerals Co.
             (Series A) $4.00......................          95,374
                                                     --------------
             PUBLISHING (0.8%)
    14,590   Hollinger International, Inc.
             $0.951................................         167,785
                                                     --------------
             REAL ESTATE (0.4%)
     1,800   Rouse Co. (Series B) $3.00............          86,850
                                                     --------------
 
<CAPTION>
 NUMBER OF
  SHARES                                                 VALUE
- -------------------------------------------------------------------
<C>          <S>                                     <C>
             REAL ESTATE INVESTMENT TRUST (2.4%)
     9,000   Equity Residential Properties
             Trust (Series E) $1.75................  $      239,625
     7,060   FelCor Suite Hotels, Inc.
             (Series A) $1.95......................         209,153
     1,085   Merry Land & Investment Co.,
             Inc. (Series C) $2.15.................          29,431
                                                     --------------
                                                            478,209
                                                     --------------
             TELECOMMUNICATIONS (2.4%)
     9,830   Loral Space & Communications
             Ltd. $3.00 - 144A**...................         489,662
                                                     --------------
 
             TOTAL CONVERTIBLE PREFERRED STOCKS
             (IDENTIFIED COST $3,133,239)..........       3,265,235
                                                     --------------
</TABLE>
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN
 THOUSANDS
- -----------
<C>          <S>                                     <C>
             CORPORATE BONDS (26.7%)
             CONVERTIBLE BONDS (14.0%)
             AUTO PARTS (1.1%)
 $     250   MascoTech, Inc.
             4.50% due 12/15/03....................         227,812
                                                     --------------
             CABLE/CELLULAR (0.7%)
       400   U.S. Cellular Corp.
             0.00% due 06/15/15....................         139,016
                                                     --------------
             FINANCE (0.7%)
       125   Aames Financial Corp.
             5.50% due 03/15/06....................         135,937
                                                     --------------
             HEALTHCARE (3.4%)
        30   Emeritus Corp. - 144A**
             6.25% due 01/01/06....................          25,802
       100   Phymatrix Corp.
             6.75% due 06/15/03....................          90,022
       375   Physicians Resource Group,
             Inc. - 144A**
             6.00% due 12/01/01....................         307,639
       300   Sterling House Corp.
             6.75% due 06/30/06....................         258,000
                                                     --------------
                                                            681,463
                                                     --------------
             HEALTHCARE - MISCELLANEOUS (0.9%)
       225   Pharmaceutical Marketing
             Services, Inc.
             6.25% due 02/01/03....................         186,469
                                                     --------------
             HOTELS/MOTELS (0.1%)
        25   Signature Resorts, Inc.
             5.75% due 01/15/07....................          24,375
                                                     --------------
             OFFICE EQUIPMENT & SUPPLIES (1.7%)
       375   U.S. Office Products Co.
             5.50% due 05/15/03....................         347,812
                                                     --------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES - INCOME BUILDER
PORTFOLIO OF INVESTMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT IN
 THOUSANDS                                               VALUE
- -------------------------------------------------------------------
<C>          <S>                                     <C>
             PUBLISHING (1.5%)
 $     300   Nelson (Thomas), Inc.
             5.75% due 11/30/99....................  $      303,189
                                                     --------------
             REAL ESTATE INVESTMENT TRUST (0.8%)
       175   Capstone Capital Corp.
             6.55% due 03/14/02....................         167,563
                                                     --------------
             RESTAURANTS (1.2%)
       160   Boston Chicken, Inc.
             4.50% due 02/01/04....................         122,133
       500   Boston Chicken, Inc.
             0.00% due 06/01/15....................         108,905
                                                     --------------
                                                            231,038
                                                     --------------
             SHOES (1.6%)
       350   Nine West Group, Inc. - 144A**
             5.50% due 07/15/03....................         320,222
                                                     --------------
             TELECOMMUNICATIONS (0.3%)
        75   Midcom Communications Inc. -
             144A**
             8.25% due 08/15/03....................          48,704
                                                     --------------
             TOTAL CONVERTIBLE BONDS
             (IDENTIFIED COST $2,738,091)..........       2,813,600
                                                     --------------
</TABLE>
<TABLE>
<CAPTION>
<C>          <S>                                     <C>
             NONCONVERTIBLE BONDS (12.7%)
             AUTO PARTS (1.7%)
       350   Lear Seating Corp.
             11.25% due 07/15/00...................         351,750
                                                     --------------
             BROADCAST MEDIA (1.1%)
       195   Outlet Broadcasting, Inc.
             10.875% due 07/15/03..................         211,899
                                                     --------------
             CABLE/CELLULAR (0.3%)
        50   Continental Cablevision, Inc.
             11.00% due 06/01/07...................          56,078
                                                     --------------
             HEALTHCARE (3.6%)
       650   Magellan Health Services, Inc.
             (Series A)
             11.25% due 04/15/04...................         721,500
                                                     --------------
             OIL & GAS (2.1%)
       400   Global Marine, Inc.
             12.75% due 12/15/99...................         419,000
                                                     --------------
             RETAIL (1.6%)
       300   Barnes & Noble, Inc. (Series B)
             11.875% due 01/15/03..................         324,750
                                                     --------------
 
<CAPTION>
 PRINCIPAL
 AMOUNT IN
 THOUSANDS                                               VALUE
- -------------------------------------------------------------------
<C>          <S>                                     <C>
             TOYS (2.3%)
 $     450   Mattel, Inc.
             10.125% due 08/15/02..................  $      468,374
                                                     --------------
 
             TOTAL NONCONVERTIBLE BONDS
             (IDENTIFIED COST $2,580,690)..........       2,553,351
                                                     --------------
 
             TOTAL CORPORATE BONDS
             (IDENTIFIED COST $5,318,781)..........       5,366,951
                                                     --------------
</TABLE>
 
<TABLE>
<CAPTION>
<C>          <S>                                     <C>
             SHORT-TERM INVESTMENTS (a) (12.1%)
             U.S. GOVERNMENT AGENCIES
     1,400   Federal Home Loan Mortgage
             Corp. 5.40% due 07/07/97..............       1,398,740
     1,035   Federal Home Loan Mortgage
             Corp. 6.00% due 07/01/97..............       1,035,000
                                                     --------------
 
             TOTAL SHORT-TERM
             INVESTMENTS
             (AMORTIZED COST $2,433,740)...........       2,433,740
                                                     --------------
 
TOTAL INVESTMENTS
  (IDENTIFIED COST
$19,288,378) (B).............      100.0%   20,062,653
 
CASH AND OTHER ASSETS IN
  EXCESS OF LIABILITIES......        0.0           925
                                   -----   -----------
 
NET ASSETS...................      100.0%  $20,063,578
                                   -----   -----------
                                   -----   -----------
<FN>
- ---------------------
STRYPES Structured yield product exchangeable for stock.
 *   Non-income producing security.
**   Resale is restricted to qualified institutional investors.
++   Consists of one or more class of securities traded together as a unit;
     stocks with attached warrants.
(1)  Convertible into IMC Global, Inc. common stock.
(2)  Convertible into SunAmerica, Inc. common stock.
(a)  Securities were purchased on a discount basis. The interest rates shown
     have been adjusted to reflect a money market equivalent yield.
(b)  The aggregate cost for federal income tax purposes approximates identified
     cost. The aggregate gross unrealized appreciation is $941,793 and the
     aggregate gross unrealized depreciation is $167,518, resulting in net
     unrealized appreciation of $774,275.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
FINANCIAL STATEMENTS
 
STATEMENTS OF ASSETS AND LIABILITIES
JUNE 30, 1997 (UNAUDITED)
 
<TABLE>
<CAPTION>
                                             MONEY        QUALITY         HIGH                       DIVIDEND
                                             MARKET     INCOME PLUS      YIELD       UTILITIES        GROWTH
<S>                                       <C>           <C>           <C>           <C>           <C>
- ----------------------------------------------------------------------------------------------------------------
ASSETS:
Investments in securities, at value*....  $363,678,258  $503,366,197  $305,147,595  $406,167,604  $1,662,983,202
Cash....................................         4,746        81,504            --        25,000              --
Receivable for:
    Investments sold....................            --    25,525,113            --     1,377,838       3,258,862
    Shares of beneficial interest
      sold..............................        65,487        30,350       248,352           706       1,788,883
    Dividends...........................            --            --            --     1,129,773       2,557,618
    Interest............................       776,631     6,769,163     6,792,210       890,305         878,814
    Foreign withholding taxes
      reclaimed.........................            --            --            --         8,995              --
Prepaid expenses and other assets.......         5,866        12,846         8,717        10,637          14,694
Receivable from affiliate...............            --            --            --            --              --
                                          ------------  ------------  ------------  ------------  --------------
     TOTAL ASSETS.......................   364,530,988   535,785,173   312,196,874   409,610,858   1,671,482,073
                                          ------------  ------------  ------------  ------------  --------------
LIABILITIES:
Written put options outstanding, at
  value.................................            --            --            --            --              --
Payable for:
    Investments purchased...............            --    82,904,305     6,009,400       266,200       9,832,634
    Shares of beneficial interest
      repurchased.......................     1,636,806       265,417            --       379,354              --
    Investment management fee...........       153,117       192,602       127,080       225,543         730,160
Accrued expenses and other payables.....        35,614        41,012        29,126        41,591          72,938
                                          ------------  ------------  ------------  ------------  --------------
     TOTAL LIABILITIES..................     1,825,537    83,403,336     6,165,606       912,688      10,635,732
                                          ------------  ------------  ------------  ------------  --------------
NET ASSETS:
Paid-in-capital.........................   362,705,163   472,826,490   397,903,968   315,540,836   1,140,372,531
Accumulated undistributed (dividends in
  excess of) net investment income......           288            --       223,148           301              96
Accumulated undistributed net realized
  gain (loss)...........................            --   (27,298,355)  (78,680,528)    8,028,263      63,252,863
Net unrealized appreciation
  (depreciation)........................            --     6,853,702   (13,415,320)   85,128,770     457,220,851
                                          ------------  ------------  ------------  ------------  --------------
     NET ASSETS.........................  $362,705,451  $452,381,837  $306,031,268  $408,698,170  $1,660,846,341
                                          ------------  ------------  ------------  ------------  --------------
                                          ------------  ------------  ------------  ------------  --------------
     *IDENTIFIED COST...................  $363,678,258  $496,512,495  $318,562,915  $321,038,834  $1,205,762,351
                                          ------------  ------------  ------------  ------------  --------------
                                          ------------  ------------  ------------  ------------  --------------
     SHARES OF BENEFICIAL INTEREST
     OUTSTANDING........................   362,705,163    43,849,051    50,213,567    26,024,177      81,287,166
                                          ------------  ------------  ------------  ------------  --------------
                                          ------------  ------------  ------------  ------------  --------------
NET ASSET VALUE PER SHARE
(UNLIMITED AUTHORIZED SHARES OF $.01 PAR
VALUE)..................................         $1.00        $10.32         $6.09        $15.70          $20.43
                                          ------------  ------------  ------------  ------------  --------------
                                          ------------  ------------  ------------  ------------  --------------
<FN>
- ------------------
**   Includes foreign cash of $140,278 and $170,219, respectively.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
FINANCIAL STATEMENTS
 
STATEMENTS OF ASSETS AND LIABILITIES
<TABLE>
<CAPTION>
JUNE 30, 1997 (UNAUDITED)
                                                            GLOBAL
                                            CAPITAL        DIVIDEND      EUROPEAN      PACIFIC
                                             GROWTH         GROWTH        GROWTH        GROWTH        EQUITY      STRATEGIST
<S>                                      <C>             <C>           <C>           <C>           <C>           <C>
- -----------------------------------------------------------------------------------------------------------------------------
ASSETS:
Investments in securities, at value*...  $  103,350,803  $445,109,264  $376,980,936  $136,731,896  $634,144,686  $469,299,412
Cash...................................              --       859,503       591,544**    1,155,432**           --       49,201
Receivable for:
    Investments sold...................       1,072,088     1,027,388     1,942,506     1,373,585            --            --
    Shares of beneficial interest
      sold.............................           3,828       438,446       151,074       315,883     1,114,015        15,135
    Dividends..........................          24,804     1,504,726       892,663       268,358       223,808       238,510
    Interest...........................             132        10,369        14,402        39,439            36     1,641,128
    Foreign withholding taxes
      reclaimed........................              --       568,221       828,513            --            --            --
Prepaid expenses and other assets......           2,451         4,608           696         6,371        12,514         9,914
Receivable from affiliate..............              --            --            --            --            --            --
                                         --------------  ------------  ------------  ------------  ------------  ------------
     TOTAL ASSETS......................     104,454,106   449,522,525   381,402,334   139,890,964   635,495,059   471,253,300
                                         --------------  ------------  ------------  ------------  ------------  ------------
LIABILITIES:
Written put options outstanding, at
  value................................              --            --            --       153,090            --            --
Payable for:
    Investments purchased..............       2,234,076     6,178,434     6,423,646     1,341,740       188,356            --
    Shares of beneficial interest
      repurchased......................         141,658         2,457            --            --         4,737        38,604
    Investment management fee..........          54,994       273,592       310,212       115,421       264,380       199,731
Accrued expenses and other payables....          19,725       109,370        60,764       129,580        48,898        45,925
                                         --------------  ------------  ------------  ------------  ------------  ------------
     TOTAL LIABILITIES.................       2,450,453     6,563,853     6,794,622     1,739,831       506,371       284,260
                                         --------------  ------------  ------------  ------------  ------------  ------------
NET ASSETS:
Paid-in-capital........................      78,868,579   355,334,122   265,350,852   136,336,312   513,198,130   395,946,499
Accumulated undistributed (dividends in
  excess of) net investment income.....         102,442        (3,933)    1,718,705       812,888            48        19,025
Accumulated undistributed net realized
  gain (loss)..........................       3,787,465    12,559,224    14,902,022   (11,470,242)   12,693,801     9,197,730
Net unrealized appreciation
  (depreciation).......................      19,245,167    75,069,259    92,636,133    12,472,175   109,096,709    65,805,786
                                         --------------  ------------  ------------  ------------  ------------  ------------
     NET ASSETS........................  $  102,003,653  $442,958,672  $374,607,712  $138,151,133  $634,988,688  $470,969,040
                                         --------------  ------------  ------------  ------------  ------------  ------------
                                         --------------  ------------  ------------  ------------  ------------  ------------
     *IDENTIFIED COST..................  $   84,105,636  $370,073,570  $284,358,074  $124,188,117  $525,047,977  $403,493,626
                                         --------------  ------------  ------------  ------------  ------------  ------------
                                         --------------  ------------  ------------  ------------  ------------  ------------
     SHARES OF BENEFICIAL INTEREST
     OUTSTANDING.......................       6,011,400    31,178,845    16,583,059    13,794,146    22,471,940    32,650,359
                                         --------------  ------------  ------------  ------------  ------------  ------------
                                         --------------  ------------  ------------  ------------  ------------  ------------
NET ASSET VALUE PER SHARE
(UNLIMITED AUTHORIZED SHARES OF $.01
PAR VALUE).............................          $16.97        $14.21        $22.59        $10.02        $28.26        $14.42
                                         --------------  ------------  ------------  ------------  ------------  ------------
                                         --------------  ------------  ------------  ------------  ------------  ------------
 
<CAPTION>
 
                                           CAPITAL        INCOME
                                         APPRECIATION     BUILDER
<S>                                      <C>            <C>
- ---------------------------------------
ASSETS:
Investments in securities, at value*...  $ 14,641,846   $20,062,653
Cash...................................            --         8,448
Receivable for:
    Investments sold...................            --            --
    Shares of beneficial interest
      sold.............................       135,294       268,051
    Dividends..........................         1,458        30,182
    Interest...........................            20       113,478
    Foreign withholding taxes
      reclaimed........................            --            --
Prepaid expenses and other assets......            --         1,544
Receivable from affiliate..............        16,989         8,499
                                         ------------   -----------
     TOTAL ASSETS......................    14,795,607    20,492,855
                                         ------------   -----------
LIABILITIES:
Written put options outstanding, at
  value................................            --            --
Payable for:
    Investments purchased..............       548,147       417,661
    Shares of beneficial interest
      repurchased......................         3,088         1,576
    Investment management fee..........            --            --
Accrued expenses and other payables....        16,983        10,040
                                         ------------   -----------
     TOTAL LIABILITIES.................       568,218       429,277
                                         ------------   -----------
NET ASSETS:
Paid-in-capital........................    13,535,951    19,209,738
Accumulated undistributed (dividends in
  excess of) net investment income.....        77,414         2,762
Accumulated undistributed net realized
  gain (loss)..........................      (600,852)       76,803
Net unrealized appreciation
  (depreciation).......................     1,214,876       774,275
                                         ------------   -----------
     NET ASSETS........................  $ 14,227,389   $20,063,578
                                         ------------   -----------
                                         ------------   -----------
     *IDENTIFIED COST..................  $ 13,426,970   $19,288,378
                                         ------------   -----------
                                         ------------   -----------
     SHARES OF BENEFICIAL INTEREST
     OUTSTANDING.......................     1,378,497     1,889,576
                                         ------------   -----------
                                         ------------   -----------
NET ASSET VALUE PER SHARE
(UNLIMITED AUTHORIZED SHARES OF $.01
PAR VALUE).............................        $10.32        $10.62
                                         ------------   -----------
                                         ------------   -----------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENTS OF OPERATIONS
FOR THE SIX MONTHS ENDED JUNE 30, 1997 (UNAUDITED)
 
<TABLE>
<CAPTION>
                                            MONEY       QUALITY       HIGH                     DIVIDEND
                                            MARKET    INCOME PLUS     YIELD      UTILITIES      GROWTH
<S>                                       <C>         <C>          <C>          <C>          <C>
- ---------------------------------------------------------------------------------------------------------
INVESTMENT INCOME:
 
INCOME
Interest................................  $9,656,295  $16,753,260  $17,429,453  $ 1,814,061  $  1,609,725
Dividends...............................          --           --           --    7,037,224**   17,940,261**
                                          ----------  -----------  -----------  -----------  ------------
     TOTAL INCOME.......................   9,656,295   16,753,260   17,429,453    8,851,285    19,549,986
                                          ----------  -----------  -----------  -----------  ------------
EXPENSES
Investment management fee...............     871,413    1,132,840      691,945    1,343,152     3,800,732
Professional fees.......................      14,149       12,940       13,917       14,915        15,937
Custodian fees..........................      10,341       20,353       10,413       14,927        35,264
Shareholder reports and notices.........       9,216        5,495        6,945       14,048        45,469
Trustees' fees and expenses.............         735        1,445          388        1,140         3,728
Transfer agent fees and expenses........         248          248          248          248           248
Other...................................       2,397        5,492        5,056        4,654         5,484
                                          ----------  -----------  -----------  -----------  ------------
     TOTAL EXPENSES.....................     908,499    1,178,813      728,912    1,393,084     3,906,862
     LESS: AMOUNTS WAIVED/ASSUMED.......          --           --           --           --            --
                                          ----------  -----------  -----------  -----------  ------------
     NET EXPENSES.......................     908,499    1,178,813      728,912    1,393,084     3,906,862
                                          ----------  -----------  -----------  -----------  ------------
     NET INVESTMENT INCOME..............   8,747,796   15,574,447   16,700,541    7,458,201    15,643,124
                                          ----------  -----------  -----------  -----------  ------------
NET REALIZED AND UNREALIZED GAIN (LOSS):
Net realized gain (loss) on:
    Investments.........................          --      156,829   (6,582,289)   8,068,074    66,034,728
    Options written.....................          --           --           --           --            --
    Foreign exchange transactions.......          --           --           --           --            --
                                          ----------  -----------  -----------  -----------  ------------
     NET GAIN (LOSS)....................          --      156,829   (6,582,289)   8,068,074    66,034,728
                                          ----------  -----------  -----------  -----------  ------------
    Net change in unrealized
      appreciation/ depreciation on:
    Investments.........................          --   (2,810,285)   2,970,883    6,666,854   158,207,532
    Translation of forward foreign
      currency contracts, other assets
      and liabilities denominated in
      foreign currencies................          --           --           --           --            --
                                          ----------  -----------  -----------  -----------  ------------
     NET APPRECIATION (DEPRECIATION)....          --   (2,810,285)   2,970,883    6,666,854   158,207,532
                                          ----------  -----------  -----------  -----------  ------------
     NET GAIN (LOSS)....................          --   (2,653,456)  (3,611,406)  14,734,928   224,242,260
                                          ----------  -----------  -----------  -----------  ------------
NET INCREASE............................  $8,747,796  $12,920,991  $13,089,135  $22,193,129  $239,885,384
                                          ----------  -----------  -----------  -----------  ------------
                                          ----------  -----------  -----------  -----------  ------------
<FN>
- ------------------
*    For the period January 21, 1997 (commencement of operations) through June
     30, 1997.
**   Net of $91,029, $75,500, $315, $599,210, $773,217, $133,650 and $18,938
     foreign witholding tax, respectively.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENTS OF OPERATIONS
<TABLE>
<CAPTION>
FOR THE SIX MONTHS ENDED JUNE 30, 1997 (UNAUDITED)
                                                           GLOBAL
                                            CAPITAL       DIVIDEND         EUROPEAN          PACIFIC
                                            GROWTH         GROWTH           GROWTH           GROWTH           EQUITY
<S>                                       <C>           <C>              <C>              <C>              <C>
- ------------------------------------------------------------------------------------------------------------------------
INVESTMENT INCOME:
 
INCOME
Interest...............................   $   257,368   $     299,562    $     304,645    $     109,673    $   1,425,067
Dividends..............................       176,273**     5,351,818**      4,704,425**      1,882,769**      2,167,343**
                                          -----------   -------------    -------------    -------------    -------------
     TOTAL INCOME......................       433,641       5,651,380        5,009,070        1,992,442        3,592,410
                                          -----------   -------------    -------------    -------------    -------------
EXPENSES
Investment management fee..............       300,243       1,386,245        1,638,764          671,338        1,422,843
Professional fees......................        13,955          16,290           16,656           19,910           14,130
Custodian fees.........................        11,777         141,836          116,231          242,500           31,834
Shareholder reports and notices........         2,733          12,570            8,950            7,139           13,660
Trustees' fees and expenses............           133             537              500              411              908
Transfer agent fees and expenses.......           248             248              248              248              248
Other..................................         1,792           5,008            8,383           10,738            3,338
                                          -----------   -------------    -------------    -------------    -------------
     TOTAL EXPENSES....................       330,881       1,562,734        1,789,732          952,284        1,486,961
     LESS: AMOUNTS WAIVED/ASSUMED......            --              --               --               --               --
                                          -----------   -------------    -------------    -------------    -------------
     NET EXPENSES......................       330,881       1,562,734        1,789,732          952,284        1,486,961
                                          -----------   -------------    -------------    -------------    -------------
     NET INVESTMENT INCOME.............       102,760       4,088,646        3,219,338        1,040,158        2,105,449
                                          -----------   -------------    -------------    -------------    -------------
NET REALIZED AND UNREALIZED GAIN
(LOSS):
Net realized gain (loss) on:
    Investments........................     4,110,799      14,096,625       15,225,919       (3,834,238)      14,218,473
    Options written....................            --              --               --            1,365               --
    Foreign exchange transactions......            --          10,433          (15,182)         (40,152)              --
                                          -----------   -------------    -------------    -------------    -------------
     NET GAIN (LOSS)...................     4,110,799      14,107,058       15,210,737       (3,873,025)      14,218,473
                                          -----------   -------------    -------------    -------------    -------------
    Net change in unrealized
      appreciation/ depreciation on:
    Investments........................     9,353,897      33,520,894       17,447,113        5,272,511       66,216,940
    Translation of forward foreign
      currency contracts, other assets
      and liabilities denominated in
      foreign currencies...............            --          23,508        1,407,700            2,967               --
                                          -----------   -------------    -------------    -------------    -------------
     NET APPRECIATION (DEPRECIATION)...     9,353,897      33,544,402       18,854,813        5,275,478       66,216,940
                                          -----------   -------------    -------------    -------------    -------------
     NET GAIN (LOSS)...................    13,464,696      47,651,460       34,065,550        1,402,453       80,435,413
                                          -----------   -------------    -------------    -------------    -------------
NET INCREASE...........................   $13,567,456   $  51,740,106    $  37,284,888    $   2,442,611    $  82,540,862
                                          -----------   -------------    -------------    -------------    -------------
                                          -----------   -------------    -------------    -------------    -------------
 
<CAPTION>
 
                                                            CAPITAL          INCOME
                                          STRATEGIST      APPRECIATION*     BUILDER*
<S>                                       <C>             <C>             <C>
- ---------------------------------------
INVESTMENT INCOME:
INCOME
Interest...............................  $   7,384,374    $   74,785      $    141,170
Dividends..............................      1,702,260         2,629           134,076
                                         -------------    ------------    ------------
     TOTAL INCOME......................      9,086,634        77,414           275,246
                                         -------------    ------------    ------------
EXPENSES
Investment management fee..............      1,105,914        29,788            34,116
Professional fees......................         13,779        13,582            13,234
Custodian fees.........................         14,664         6,464             7,964
Shareholder reports and notices........         10,212         3,579             1,430
Trustees' fees and expenses............          1,277           659                46
Transfer agent fees and expenses.......            248           248               224
Other..................................          4,684            --               417
                                         -------------    ------------    ------------
     TOTAL EXPENSES....................      1,150,778        54,320            57,431
     LESS: AMOUNTS WAIVED/ASSUMED......             --       (54,320)          (57,431)
                                         -------------    ------------    ------------
     NET EXPENSES......................      1,150,778            --                --
                                         -------------    ------------    ------------
     NET INVESTMENT INCOME.............      7,935,856        77,414           275,246
                                         -------------    ------------    ------------
NET REALIZED AND UNREALIZED GAIN
(LOSS):
Net realized gain (loss) on:
    Investments........................      9,415,066      (600,852)           76,803
    Options written....................             --            --                --
    Foreign exchange transactions......             --            --                --
                                         -------------    ------------    ------------
     NET GAIN (LOSS)...................      9,415,066      (600,852)           76,803
                                         -------------    ------------    ------------
    Net change in unrealized
      appreciation/ depreciation on:
    Investments........................     22,660,994     1,214,876           774,275
    Translation of forward foreign
      currency contracts, other assets
      and liabilities denominated in
      foreign currencies...............             --            --                --
                                         -------------    ------------    ------------
     NET APPRECIATION (DEPRECIATION)...     22,660,994     1,214,876           774,275
                                         -------------    ------------    ------------
     NET GAIN (LOSS)...................     32,076,060       614,024           851,078
                                         -------------    ------------    ------------
NET INCREASE...........................  $  40,011,916    $  691,438      $  1,126,324
                                         -------------    ------------    ------------
                                         -------------    ------------    ------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENTS OF CHANGES IN NET ASSETS
 
<TABLE>
<CAPTION>
                                                 MONEY MARKET             QUALITY INCOME PLUS
                                          ---------------------------  --------------------------
                                          FOR THE SIX                  FOR THE SIX
                                          MONTHS ENDED  FOR THE YEAR   MONTHS ENDED  FOR THE YEAR
                                            JUNE 30,        ENDED        JUNE 30,       ENDED
                                              1997      DECEMBER 31,       1997      DECEMBER 31,
                                          (UNAUDITED)       1996       (UNAUDITED)       1996
<S>                                       <C>           <C>            <C>           <C>
- -------------------------------------------------------------------------------------------------
INCREASE (DECREASE) IN NET ASSETS:
 
OPERATIONS:
Net investment income...................  $  8,747,796  $ 14,442,540   $ 15,574,447  $32,950,563
Net realized gain (loss)................            --            --        156,829   (2,603,573 )
Net change in unrealized
  appreciation/depreciation.............            --            --     (2,810,285) (24,916,368 )
                                          ------------  -------------  ------------  ------------
     NET INCREASE.......................     8,747,796    14,442,540     12,920,991    5,430,622
                                          ------------  -------------  ------------  ------------
DIVIDENDS AND DISTRIBUTIONS FROM:
Net investment income...................    (8,747,752)  (14,442,318 )  (15,641,976) (33,491,200 )
Net realized gain.......................            --            --             --           --
                                          ------------  -------------  ------------  ------------
     TOTAL..............................    (8,747,752)  (14,442,318 )  (15,641,976) (33,491,200 )
                                          ------------  -------------  ------------  ------------
TRANSACTIONS IN SHARES OF BENEFICIAL
INTEREST:
Net proceeds from sales.................    92,427,371   199,781,437      4,443,668   18,363,915
Reinvestment of dividends and
  distributions.........................     8,747,752    14,442,318     15,641,986   33,491,200
Cost of shares repurchased..............   (78,707,757) (123,772,522 )  (39,643,044) (69,712,880 )
                                          ------------  -------------  ------------  ------------
     NET INCREASE (DECREASE)............    22,467,366    90,451,233    (19,557,390) (17,857,765 )
                                          ------------  -------------  ------------  ------------
     TOTAL INCREASE (DECREASE)..........    22,467,410    90,451,455    (22,278,375) (45,918,343 )
NET ASSETS:
Beginning of period.....................   340,238,041   249,786,586    474,660,212  520,578,555
                                          ------------  -------------  ------------  ------------
     END OF PERIOD......................  $362,705,451  $340,238,041   $452,381,837  $474,660,212
                                          ------------  -------------  ------------  ------------
                                          ------------  -------------  ------------  ------------
UNDISTRIBUTED NET INVESTMENT INCOME.....  $        288  $        244             --  $    67,529
                                          ------------  -------------  ------------  ------------
                                          ------------  -------------  ------------  ------------
SHARES ISSUED AND REPURCHASED:
Sold....................................    92,427,371   199,781,437        433,855    1,751,757
Issued in reinvestment of dividends and
  distributions.........................     8,747,752    14,442,318      1,530,424    3,241,058
Repurchased.............................   (78,707,757) (123,772,522 )   (3,867,996)  (6,752,796 )
                                          ------------  -------------  ------------  ------------
NET INCREASE (DECREASE).................    22,467,366    90,451,233     (1,903,717)  (1,759,981 )
                                          ------------  -------------  ------------  ------------
                                          ------------  -------------  ------------  ------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENTS OF CHANGES IN NET ASSETS
<TABLE>
<CAPTION>
                                                 HIGH YIELD                   UTILITES
                                         --------------------------  --------------------------         DIVIDEND GROWTH
                                                                                                 ------------------------------
                                         FOR THE SIX                 FOR THE SIX
                                         MONTHS ENDED  FOR THE YEAR  MONTHS ENDED  FOR THE YEAR   FOR THE SIX
                                           JUNE 30,       ENDED        JUNE 30,       ENDED       MONTHS ENDED    FOR THE YEAR
                                             1997      DECEMBER 31,      1997      DECEMBER 31,  JUNE 30, 1997   ENDED DECEMBER
                                         (UNAUDITED)       1996      (UNAUDITED)       1996       (UNAUDITED)       31, 1996
<S>                                      <C>           <C>           <C>           <C>           <C>             <C>
- -------------------------------------------------------------------------------------------------------------------------------
INCREASE (DECREASE) IN NET ASSETS:
 
OPERATIONS:
Net investment income..................  $ 16,700,541  $25,415,550   $  7,458,201  $16,513,033   $   15,643,124  $   26,113,139
Net realized gain (loss)...............    (6,582,289)  (5,282,128 )    8,068,074    5,380,515       66,034,728      76,341,307
Net change in unrealized
  appreciation/depreciation............     2,970,883    2,235,871      6,666,854   14,769,561      158,207,532     126,566,513
                                         ------------  ------------  ------------  ------------  --------------  --------------
     NET INCREASE......................    13,089,135   22,369,293     22,193,129   36,663,109      239,885,384     229,020,959
                                         ------------  ------------  ------------  ------------  --------------  --------------
DIVIDENDS AND DISTRIBUTIONS FROM:
Net investment income..................   (16,492,603) (25,894,730 )   (7,457,900) (16,518,454 )    (15,643,133)    (26,130,248)
Net realized gain......................            --           --     (5,380,334)  (1,186,573 )    (76,862,063)    (25,851,911)
                                         ------------  ------------  ------------  ------------  --------------  --------------
     TOTAL.............................   (16,492,603) (25,894,730 )  (12,838,234) (17,705,027 )    (92,505,196)    (51,982,159)
                                         ------------  ------------  ------------  ------------  --------------  --------------
TRANSACTIONS IN SHARES OF BENEFICIAL
INTEREST:
Net proceeds from sales................    39,353,485   97,281,752        328,753   10,173,470      144,824,227     216,135,874
Reinvestment of dividends and
  distributions........................    16,492,618   25,894,730     12,838,234   17,705,027       92,505,178      51,982,159
Cost of shares repurchased.............    (5,959,908) (14,412,089 )  (54,485,578) (85,244,858 )    (12,267,679)    (22,169,232)
                                         ------------  ------------  ------------  ------------  --------------  --------------
     NET INCREASE (DECREASE)...........    49,886,195  108,764,393    (41,318,591) (57,366,361 )    225,061,726     245,948,801
                                         ------------  ------------  ------------  ------------  --------------  --------------
     TOTAL INCREASE (DECREASE).........    46,482,727  105,238,956    (31,963,696) (38,408,279 )    372,441,914     422,987,601
NET ASSETS:
Beginning of period....................   259,548,541  154,309,585    440,661,866  479,070,145    1,288,404,427     865,416,826
                                         ------------  ------------  ------------  ------------  --------------  --------------
     END OF PERIOD.....................  $306,031,268  $259,548,541  $408,698,170  $440,661,866  $1,660,846,341  $1,288,404,427
                                         ------------  ------------  ------------  ------------  --------------  --------------
                                         ------------  ------------  ------------  ------------  --------------  --------------
UNDISTRIBUTED NET INVESTMENT INCOME....  $    223,148  $    15,210   $        301           --   $           96  $          105
                                         ------------  ------------  ------------  ------------  --------------  --------------
                                         ------------  ------------  ------------  ------------  --------------  --------------
SHARES ISSUED AND REPURCHASED:
Sold...................................     6,462,994   15,513,116         21,146      688,255        7,340,440      12,705,268
Issued in reinvestment of dividends and
  distributions........................     2,732,226    4,153,525        831,893    1,195,247        4,567,039       3,121,829
Repurchased............................      (986,265)  (2,293,681 )   (3,563,838)  (5,772,285 )       (637,393)     (1,315,470)
                                         ------------  ------------  ------------  ------------  --------------  --------------
NET INCREASE (DECREASE)................     8,208,955   17,372,960     (2,710,799)  (3,888,783 )     11,270,086      14,511,627
                                         ------------  ------------  ------------  ------------  --------------  --------------
                                         ------------  ------------  ------------  ------------  --------------  --------------
 
<CAPTION>
                                              CAPITAL GROWTH
                                         -------------------------
 
                                         FOR THE SIX
                                         MONTHS ENDED    FOR THE
                                           JUNE 30,    YEAR ENDED
                                             1997       DECEMBER
                                         (UNAUDITED)    31, 1996
<S>                                      <C>           <C>
- ---------------------------------------
INCREASE (DECREASE) IN NET ASSETS:
OPERATIONS:
Net investment income..................  $    102,760  $  406,814
Net realized gain (loss)...............     4,110,799  11,957,509
Net change in unrealized
  appreciation/depreciation............     9,353,897  (4,318,064 )
                                         ------------  -----------
     NET INCREASE......................    13,567,456   8,046,259
                                         ------------  -----------
DIVIDENDS AND DISTRIBUTIONS FROM:
Net investment income..................      (406,790)   (132,322 )
Net realized gain......................   (11,642,834) (1,337,440 )
                                         ------------  -----------
     TOTAL.............................   (12,049,624) (1,469,762 )
                                         ------------  -----------
TRANSACTIONS IN SHARES OF BENEFICIAL
INTEREST:
Net proceeds from sales................     6,956,890  21,627,226
Reinvestment of dividends and
  distributions........................    12,049,624   1,469,762
Cost of shares repurchased.............    (5,382,843) (9,806,505 )
                                         ------------  -----------
     NET INCREASE (DECREASE)...........    13,623,671  13,290,483
                                         ------------  -----------
     TOTAL INCREASE (DECREASE).........    15,141,503  19,866,980
NET ASSETS:
Beginning of period....................    86,862,150  66,995,170
                                         ------------  -----------
     END OF PERIOD.....................  $102,003,653  $86,862,150
                                         ------------  -----------
                                         ------------  -----------
UNDISTRIBUTED NET INVESTMENT INCOME....  $    102,442  $  406,472
                                         ------------  -----------
                                         ------------  -----------
SHARES ISSUED AND REPURCHASED:
Sold...................................       397,780   1,329,674
Issued in reinvestment of dividends and
  distributions........................       710,054      96,568
Repurchased............................      (311,890)   (611,382 )
                                         ------------  -----------
NET INCREASE (DECREASE)................       795,944     814,860
                                         ------------  -----------
                                         ------------  -----------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENTS OF CHANGES IN NET ASSETS, CONTINUED
 
<TABLE>
<CAPTION>
                                            GLOBAL DIVIDEND GROWTH         EUROPEAN GROWTH
                                          --------------------------  --------------------------
                                          FOR THE SIX                 FOR THE SIX
                                          MONTHS ENDED  FOR THE YEAR  MONTHS ENDED  FOR THE YEAR
                                            JUNE 30,       ENDED        JUNE 30,       ENDED
                                              1997      DECEMBER 31,      1997      DECEMBER 31,
                                          (UNAUDITED)       1996      (UNAUDITED)       1996
<S>                                       <C>           <C>           <C>           <C>
- ------------------------------------------------------------------------------------------------
INCREASE (DECREASE) IN NET ASSETS:
 
OPERATIONS:
Net investment income...................  $  4,088,646  $ 5,178,815   $  3,219,338  $ 2,264,492
Net realized gain (loss)................    14,107,058   17,454,295     15,210,737   19,547,703
Net change in unrealized
  appreciation/depreciation.............    33,544,402   21,236,500     18,854,813   41,074,663
                                          ------------  ------------  ------------  ------------
     NET INCREASE.......................    51,740,106   43,869,610     37,284,888   62,886,858
                                          ------------  ------------  ------------  ------------
DIVIDENDS AND DISTRIBUTIONS FROM:
Net investment income...................    (4,441,032)  (5,251,753 )   (3,760,260)    (531,371 )
Net realized gain.......................   (17,705,615)  (6,985,312 )  (18,466,455) (11,996,632 )
                                          ------------  ------------  ------------  ------------
     TOTAL..............................   (22,146,647) (12,237,065 )  (22,226,715) (12,528,003 )
                                          ------------  ------------  ------------  ------------
TRANSACTIONS IN SHARES OF BENEFICIAL
INTEREST:
Net proceeds from sales.................    59,933,312   90,625,831     42,198,517   60,993,831
Reinvestment of dividends and
  distributions.........................    22,146,643   12,237,065     22,226,715   12,528,003
Cost of shares repurchased..............    (3,535,684)  (5,413,023 )   (7,297,747)  (9,578,044 )
                                          ------------  ------------  ------------  ------------
     NET INCREASE (DECREASE)............    78,544,271   97,449,873     57,127,485   63,943,790
                                          ------------  ------------  ------------  ------------
     TOTAL INCREASE (DECREASE)..........   108,137,730  129,082,418     72,185,658  114,302,645
NET ASSETS:
Beginning of period.....................   334,820,942  205,738,524    302,422,054  188,119,409
                                          ------------  ------------  ------------  ------------
     END OF PERIOD......................  $442,958,672  $334,820,942  $374,607,712  $302,422,054
                                          ------------  ------------  ------------  ------------
                                          ------------  ------------  ------------  ------------
UNDISTRIBUTED NET INVESTMENT INCOME.....  $     (3,933)** $   348,453 $  1,718,705  $ 2,259,627
                                          ------------  ------------  ------------  ------------
                                          ------------  ------------  ------------  ------------
SHARES ISSUED AND REPURCHASED:
Sold....................................     4,371,924    7,330,384      1,900,025    3,131,701
Issued in reinvestment of dividends and
  distributions.........................     1,564,658    1,008,262        983,918      677,922
Repurchased.............................      (260,394)    (440,583 )     (327,701)    (514,185 )
                                          ------------  ------------  ------------  ------------
NET INCREASE (DECREASE).................     5,676,188    7,898,063      2,556,242    3,295,438
                                          ------------  ------------  ------------  ------------
                                          ------------  ------------  ------------  ------------
<FN>
- ------------------
*    For the period January 21, 1997 (commencement of operations) through June
     30, 1997.
**   Dividends in excess of net investment income.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
FINANCIAL STATEMENTS, CONTINUED
 
STATEMENTS OF CHANGES IN NET ASSETS
<TABLE>
<CAPTION>
                                               PACIFIC GROWTH                  EQUITY                    STRATEGIST
                                         --------------------------  --------------------------  --------------------------
                                         FOR THE SIX                 FOR THE SIX                 FOR THE SIX
                                         MONTHS ENDED  FOR THE YEAR  MONTHS ENDED  FOR THE YEAR  MONTHS ENDED  FOR THE YEAR
                                           JUNE 30,       ENDED        JUNE 30,       ENDED        JUNE 30,       ENDED
                                             1997      DECEMBER 31,      1997      DECEMBER 31,      1997      DECEMBER 31,
                                         (UNAUDITED)       1996      (UNAUDITED)       1996      (UNAUDITED)       1996
<S>                                      <C>           <C>           <C>           <C>           <C>           <C>
- ---------------------------------------------------------------------------------------------------------------------------
INCREASE (DECREASE) IN NET ASSETS:
 
OPERATIONS:
Net investment income..................  $  1,040,158  $ 1,412,599   $  2,105,449  $ 2,556,972   $  7,935,856  $13,143,825
Net realized gain (loss)...............    (3,873,025)  (2,475,077 )   14,218,473   42,116,968      9,415,066    9,836,251
Net change in unrealized
  appreciation/depreciation............     5,275,478    3,540,345     66,216,940    5,775,201     22,660,994   32,734,426
                                         ------------  ------------  ------------  ------------  ------------  ------------
     NET INCREASE......................     2,442,611    2,477,867     82,540,862   50,449,141     40,011,916   55,714,502
                                         ------------  ------------  ------------  ------------  ------------  ------------
DIVIDENDS AND DISTRIBUTIONS FROM:
Net investment income..................    (1,891,258)  (1,651,362 )   (2,106,164)  (2,577,952 )   (7,933,398) (13,174,571)
Net realized gain......................            --           --    (43,430,212) (54,814,557 )  (10,026,594)  (3,569,367)
                                         ------------  ------------  ------------  ------------  ------------  ------------
     TOTAL.............................    (1,891,258)  (1,651,362 )  (45,536,376) (57,392,509 )  (17,959,992) (16,743,938)
                                         ------------  ------------  ------------  ------------  ------------  ------------
TRANSACTIONS IN SHARES OF BENEFICIAL
INTEREST:
Net proceeds from sales................    11,138,156   66,862,929     52,764,227  132,116,853     22,590,103   25,629,890
Reinvestment of dividends and
  distributions........................     1,891,258    1,651,362     45,536,376   57,392,509     17,959,991   16,743,938
Cost of shares repurchased.............   (19,966,091) (23,134,634 )  (22,224,825) (20,436,940 )  (15,400,830) (46,155,709)
                                         ------------  ------------  ------------  ------------  ------------  ------------
     NET INCREASE (DECREASE)...........    (6,936,677)  45,379,657     76,075,778  169,072,422     25,149,264   (3,781,881)
                                         ------------  ------------  ------------  ------------  ------------  ------------
     TOTAL INCREASE (DECREASE).........    (6,385,324)  46,206,162    113,080,264  162,129,054     47,201,188   35,188,683
NET ASSETS:
Beginning of period....................   144,536,457   98,330,295    521,908,424  359,779,370    423,767,852  388,579,169
                                         ------------  ------------  ------------  ------------  ------------  ------------
     END OF PERIOD.....................  $138,151,133  $144,536,457  $634,988,688  $521,908,424  $470,969,040  $423,767,852
                                         ------------  ------------  ------------  ------------  ------------  ------------
                                         ------------  ------------  ------------  ------------  ------------  ------------
UNDISTRIBUTED NET INVESTMENT INCOME....  $    812,888  $ 1,663,988   $         48  $       763   $     19,025  $    16,567
                                         ------------  ------------  ------------  ------------  ------------  ------------
                                         ------------  ------------  ------------  ------------  ------------  ------------
SHARES ISSUED AND REPURCHASED:
Sold...................................     1,136,342    6,522,537      1,865,912    4,838,072      1,582,854    1,954,971
Issued in reinvestment of dividends and
  distributions........................       188,937      173,462      1,613,652    2,452,920      1,260,034    1,285,378
Repurchased............................    (2,037,810)  (2,326,246 )     (786,582)    (770,532 )   (1,082,773)  (3,573,439)
                                         ------------  ------------  ------------  ------------  ------------  ------------
NET INCREASE (DECREASE)................      (712,531)   4,369,753      2,692,982    6,520,460      1,760,115     (333,090)
                                         ------------  ------------  ------------  ------------  ------------  ------------
                                         ------------  ------------  ------------  ------------  ------------  ------------
 
<CAPTION>
                                           CAPITAL      INCOME
                                         APPRECIATION   BUILDER
                                         -----------  -----------
 
                                         FOR THE SIX  FOR THE SIX
                                           MONTHS       MONTHS
                                            ENDED        ENDED
                                          JUNE 30,     JUNE 30,
                                            1997*        1997*
                                         (UNAUDITED)  (UNAUDITED)
<S>                                      <C>          <C>
- ---------------------------------------
INCREASE (DECREASE) IN NET ASSETS:
OPERATIONS:
Net investment income..................  $    77,414  $   275,246
Net realized gain (loss)...............     (600,852)      76,803
Net change in unrealized
  appreciation/depreciation............    1,214,876      774,275
                                         -----------  -----------
     NET INCREASE......................      691,438    1,126,324
                                         -----------  -----------
DIVIDENDS AND DISTRIBUTIONS FROM:
Net investment income..................           --     (272,484)
Net realized gain......................           --           --
                                         -----------  -----------
     TOTAL.............................           --     (272,484)
                                         -----------  -----------
TRANSACTIONS IN SHARES OF BENEFICIAL
INTEREST:
Net proceeds from sales................   14,673,617   19,221,839
Reinvestment of dividends and
  distributions........................           --      272,484
Cost of shares repurchased.............   (1,137,676)    (284,595)
                                         -----------  -----------
     NET INCREASE (DECREASE)...........   13,535,941   19,209,728
                                         -----------  -----------
     TOTAL INCREASE (DECREASE).........   14,227,379   20,063,568
NET ASSETS:
Beginning of period....................           10           10
                                         -----------  -----------
     END OF PERIOD.....................  $14,227,389  $20,063,578
                                         -----------  -----------
                                         -----------  -----------
UNDISTRIBUTED NET INVESTMENT INCOME....  $    77,414  $     2,762
                                         -----------  -----------
                                         -----------  -----------
SHARES ISSUED AND REPURCHASED:
Sold...................................    1,493,791    1,892,294
Issued in reinvestment of dividends and
  distributions........................           --       26,161
Repurchased............................     (115,295)     (28,880)
                                         -----------  -----------
NET INCREASE (DECREASE)................    1,378,496    1,889,575
                                         -----------  -----------
                                         -----------  -----------
</TABLE>
<PAGE>
DEAN WITTER VARIABLE INVESTMENTS SERIES
NOTES TO FINANCIAL STATEMENTS JUNE 30, 1997 (UNAUDITED)
 
1. ORGANIZATION AND ACCOUNTING POLICIES
 
Dean Witter Variable Investment Series (the "Fund") is registered under the
Investment Company Act of 1940, as amended, as a diversified, open-end
management investment company. Investments in the Fund may be made only by (1)
Northbrook Life Insurance Company to fund the benefits under variable annuity
contracts and variable life insurance contracts it issues; (2) Allstate Life
Insurance Company of New York to fund the benefits under variable annuity
contracts it issues; (3) Glenbrook Life and Annuity Company to fund the benefits
under variable annuity contracts and variable life insurance contracts it
issues; and (4) Paragon Life Insurance Company to fund the benefits under
variable life insurance contracts it issues to certain employees of Morgan
Stanley, Dean Witter, Discover & Co., the parent company of Dean Witter
InterCapital Inc. (the "Investment Manager").
 
The Fund, organized on February 25, 1983 as a Massachusetts business trust,
consists of thirteen Portfolios ("Portfolios") which commenced operations as
follows:
 
<TABLE>
<CAPTION>
                                               COMMENCEMENT                                               COMMENCEMENT
                                               OF                                                         OF
PORTFOLIO                                      OPERATIONS  PORTFOLIO                                      OPERATIONS
- ---------------------------------------------  ----------- ---------------------------------------------  -----------
<S>                                            <C>         <C>                                            <C>
                                                  March 9,                                                   March 1,
Money Market.................................         1984 European Growth..............................         1991
                                                  March 1,                                                   February
Quality Income Plus..........................         1987 Pacific Growth...............................     23, 1994
                                                  March 9,                                                   March 9,
High Yield...................................         1984 Equity.......................................         1984
                                                  March 1,                                                   March 1,
Utilities....................................         1990 Strategist...................................         1987
                                                  March 1,                                                January 21,
Dividend Growth..............................         1990 Capital Appreciation.........................         1997
                                                  March 1,                                                January 21,
Capital Growth...............................         1991 Income Builder...............................         1997
                                                  February
Global Dividend Growth.......................     23, 1994
</TABLE>
<TABLE>
<CAPTION>
The investment objectives of each Portfolio are as follows:
<S>           <C>
 
<CAPTION>
 
  PORTFOLIO                         INVESTMENT OBJECTIVE
<S>           <C>
Money Market  Seeks high current income, preservation of capital and liquidity
              by investing in short-term money market instruments.
Quality Income Seeks, as its primary objective, to earn a high level of current
Plus          income and, as a secondary objective, capital appreciation, but
              only when consistent with its primary objective, by investing
              primarily in U.S. Government securities and higher-rated fixed
              income securities.
High Yield    Seeks, as its primary objective, to earn a high level of current
              income and, as a secondary objective, capital appreciation, but
              only when consistent with its primary objective, by investing
              primarily in lower-rated fixed income securities.
Utilities     Seeks to provide current income and long-term growth of income
              and capital by investing primarily in equity and fixed income
              securities of companies engaged in the public utilities industry.
Dividend      Seeks to provide reasonable current income and long-term growth
Growth        of income and capital by investing primarily in common stock of
              companies with a record of paying dividends and the potential for
              increasing dividends.
<PAGE>
</TABLE>
 
DEAN WITTER VARIABLE INVESTMENTS SERIES
NOTES TO FINANCIAL STATEMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
<TABLE>
<CAPTION>
  PORTFOLIO                         INVESTMENT OBJECTIVE
<S>           <C>
Capital Growth Seeks long-term capital growth by investing primarily in common
               stocks.
Global        Seeks to provide reasonable current income and long-term growth
Dividend      of income and capital by investing primarily in common stocks of
Growth        companies, issued by issuers worldwide, with a record of paying
              dividends and the potential for increasing dividends.
European      Seeks to maximize the capital appreciation of its investments by
Growth        investing primarily in securities issued by issuers located in
              Europe.
Pacific Growth Seeks to maximize the capital appreciation of its investments by
              investing primarily in securities issued by issuers located in
              Asia, Australia and New Zealand.
Equity        Seeks, as its primary objective, capital growth and, as a
              secondary objective, income, but only when consistent with its
              primary objective, by investing primarily in common stocks.
Strategist    Seeks a high total investment return through a fully managed
              investment policy utilizing equity, investment grade fixed income
              and money market securities and writing covered options.
Capital       Seeks long-term capital appreciation by investing primarily in
Appreciation  the common stocks of U.S. companies that offer the potential for
              either superior earnings growth and/or appear to be undervalued.
Income Builder Seeks, as its primary objective, to earn reasonable income and,
              as a secondary objective, growth of capital by investing
              primarily in income-producing equity securities.
</TABLE>
 
The preparation of financial statements in accordance with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts and disclosures. Actual results could differ from
those estimates.
 
The following is a summary of significant accounting policies:
 
A. VALUATION OF INVESTMENTS -- Money Market: Securities are valued at amortized
cost which approximates market value. All remaining Portfolios: (1) an equity
security listed or traded on the New York, American or other domestic or foreign
stock exchange is valued at its latest sale price on that exchange prior to the
time when assets are valued; if there were no sales that day, the security is
valued at the latest bid price (in cases where securities are traded on more
than one exchange, the securities are valued on the exchange designated as the
primary market pursuant to procedures adopted by the Trustees); (2) all other
portfolio securities for which over-the-counter market quotations are readily
available are valued at the latest available bid price prior to the time of
valuation; (3) listed options are valued at the latest sale price on the
exchange on which they are listed unless no sales of such options have taken
place that day, in which case they are valued at the mean between their latest
bid and asked price; (4) when market quotations are not readily available,
including circumstances under which it is determined by the Investment Manager
(or, in the case of European Growth and Pacific Growth, by Morgan Grenfell
Investment Services Limited (the "Sub-
<PAGE>
DEAN WITTER VARIABLE INVESTMENTS SERIES
NOTES TO FINANCIAL STATEMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
Adviser")) that sale or bid prices are not reflective of a security's market
value, portfolio securities are valued at their fair value as determined in good
faith under procedures established by and under the general supervision of the
Trustees (valuation of debt securities for which market quotations are not
readily available may also be based upon current market prices of securities
which are comparable in coupon, rating and maturity or an appropriate matrix
utilizing similar factors); (5) certain of the Fund's portfolio securities may
be valued by an outside pricing service approved by the Trustees. The pricing
service may utilize a matrix system incorporating security quality, maturity and
coupon as the evaluation model parameters, and/or research and evaluations by
its staff, including review of broker-dealer market price quotations in
determining what it believes is the fair valuation of the securities valued by
such pricing service; and (6) short-term debt securities having a maturity date
of more than sixty days at the time of purchase are valued on a mark-to-market
basis until sixty days prior to maturity and thereafter at amortized cost based
on their value on the 61st day. Short-term debt securities having a maturity
date of sixty days or less at the time of purchase are valued at amortized cost.
 
B. ACCOUNTING FOR INVESTMENTS -- Security transactions are accounted for on the
trade date (date the order to buy or sell is executed). Realized gains and
losses on security transactions are determined by the identified cost method.
Dividend income and other distributions are recorded on the ex-dividend date
except for certain dividends on foreign securities which are recorded as soon as
the Fund is informed after the ex-dividend date. Interest income is accrued
daily except where collection is not expected. Money Market amortizes premiums
and accretes discounts on securities owned; gains and losses realized upon the
sale of securities are based on amortized cost. Discounts for all other
Portfolios are accreted over the life of the respective securities.
 
C. ACCOUNTING FOR OPTIONS --  (1) Written options on debt obligations, equities
and foreign currency: When the Fund writes a call or put option, an amount equal
to the premium received is included in the Fund's Statement of Assets and
Liabilities as a liability which is subsequently marked-to-market to reflect the
current market value of the option written. If a written option either expires
or the Fund enters into a closing purchase transaction, the Fund realizes a gain
or loss without regard to any unrealized gain or loss on the underlying security
or currency and the liability related to such option is extinguished. If a
written call option is exercised, the Fund realizes a gain or loss from the sale
of the underlying security or currency and the proceeds from such sale are
increased by the premium originally received. If a put option which the Fund has
written is exercised, the amount of the premium originally received reduces the
cost of the security which the Fund purchases upon exercise of the option; and
(2) purchased options on debt obligations, equities and foreign currency:
<PAGE>
DEAN WITTER VARIABLE INVESTMENTS SERIES
NOTES TO FINANCIAL STATEMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
When the Fund purchases a call or put option, the premium paid is recorded as an
investment and is subsequently marked-to-market to reflect the current market
value. If a purchased option expires, the Fund will realize a loss to the extent
of the premium paid. If the Fund enters into a closing sale transaction, a gain
or loss is realized for the difference between the proceeds from the sale and
the cost of the option. If a put option is exercised, the cost of the security
sold upon exercise will be increased by the premium originally paid. If a call
option is exercised, the cost of the security purchased upon exercise will be
increased by the premium originally paid.
 
D. FOREIGN CURRENCY TRANSLATION --  The books and records of the Portfolios
investing in foreign currency denominated transactions are translated into U.S.
dollars as follows: (1) the foreign currency market value of investment
securities, other assets and liabilities and forward foreign currency contracts
are translated at the exchange rates prevailing at the end of the period; and
(2) purchases, sales, income and expenses are translated at the exchange rates
prevailing on the respective dates of such transactions. The resultant exchange
gains and losses are included in the Statement of Operations as realized and
unrealized gain/loss on foreign exchange transactions. Pursuant to U.S. Federal
income tax regulations, certain foreign exchange gains/losses included in
realized and unrealized gain/loss are included in or are a reduction of ordinary
income for federal income tax purposes. The Portfolios do not isolate that
portion of the results of operations arising as a result of changes in the
foreign exchange rates from the changes in the market prices of the securities.
 
E. FORWARD FOREIGN CURRENCY CONTRACTS --  Some of the Portfolios may enter into
forward foreign currency contracts which are valued daily at the appropriate
exchange rates. The resultant unrealized exchange gains and losses are included
in the Statement of Operations as unrealized gain/loss on foreign exchange
transactions. The Portfolios record realized gains or losses on delivery of the
currency or at the time the forward contract is extinguished (compensated) by
entering into a closing transaction prior to delivery.
 
F. FEDERAL INCOME TAX STATUS --  It is the Fund's policy to comply individually
for each Portfolio with the requirements of the Internal Revenue Code applicable
to regulated investment companies and to distribute all of its taxable income to
its shareholders. Accordingly, no federal income tax provision is required.
 
G. DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS --  The Fund records dividends
and distributions to its shareholders on the record date. The amount of
dividends and distributions from net investment income and net realized capital
gains are determined in accordance with federal income tax regulations which may
differ from generally accepted accounting principles. These "book/tax"
<PAGE>
DEAN WITTER VARIABLE INVESTMENTS SERIES
NOTES TO FINANCIAL STATEMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
differences are either considered temporary or permanent in nature. To the
extent these differences are permanent in nature, such amounts are reclassified
within the capital accounts based on their federal tax-basis treatment;
temporary differences do not require reclassification. Dividends and
distributions which exceed net investment income and net realized capital gains
for financial reporting purposes but not for tax purposes are reported as
dividends in excess of net investment income or distributions in excess of net
realized capital gains. To the extent they exceed net investment income and net
realized capital gains for tax purposes, they are reported as distributions of
paid-in-capital.
 
H. EXPENSES --  Direct expenses are charged to the respective Portfolio and
general Fund expenses are allocated on the basis of relative net assets or
equally among the Portfolios.
 
2. INVESTMENT MANAGEMENT AND SUB-ADVISORY AGREEMENT
 
Pursuant to an Investment Management Agreement (the "Agreement"), the Fund pays
the Investment Manager a management fee, accrued daily and payable monthly, by
applying the following annual rates to each Portfolios' net assets determined at
the close of each business day: Money Market, High Yield and Strategist-0.50%;
Quality Income Plus-0.50% to the portion of daily net assets not exceeding $500
million and 0.45% to the portion of daily net assets exceeding $500 million;
Utilities-0.65% to the portion of daily net assets not exceeding $500 million
and 0.55% to the portion of daily net assets exceeding $500 million; Capital
Growth-0.65%; Global Dividend Growth, Capital Appreciation and Income
Builder-0.75%; European Growth and Pacific Growth-1.0%; Dividend Growth-0.625%
to the portion of daily net assets not exceeding $500 million; 0.50% to the
portion of daily net assets exceeding $500 million but not exceeding $1 billion
and 0.475% to the portion of daily net assets exceeding $1 billion; and
Equity-0.50% to the portion of daily net assets not exceeding $1 billion and
0.475% to the portion of daily net assets exceeding $1 billion.
 
Under the terms of the Agreement, in addition to managing the Fund's
investments, the Investment Manager maintains certain of the Fund's books and
records and furnishes, at its own expense, office space, facilities, equipment,
clerical, bookkeeping and certain legal services and pays the salaries of all
personnel, including officers of the Fund who are employees of the Investment
Manager. The Investment Manager also bears the cost of telephone services, heat,
light, power and other utilities provided to the Fund.
 
Under a Sub-Advisory Agreement between the Investment Manager and the
Sub-Adviser, the Sub-Adviser provides the European Growth and Pacific Growth
with investment advice and portfolio management relating to the Portfolios'
investments in securities, subject to the overall supervision of
<PAGE>
DEAN WITTER VARIABLE INVESTMENTS SERIES
NOTES TO FINANCIAL STATEMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
the Investment Manager. As compensation for its services provided pursuant to
the Sub-Advisory Agreement, the Investment Manager pays the Sub-Adviser monthly
compensation equal to 40% of its monthly compensation.
 
The Investment Manager has undertaken to reimburse all operating expenses and
waive the compensation provided for in its Investment Management Agreement with
Capital Appreciation and Income Builder until such time as the respective
Portfolios have $50 million of net assets or July 31, 1998, whichever occurs
first. At June 30, 1997, included in the Statements of Assets and Liabilities
are receivables from an affiliate which represent expense reimbursements due to
the Portfolios.
 
3. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES
 
Purchases and sales/maturities of portfolio securities, excluding short-term
investments (except for the Money Market Portfolio), for the period ended June
30, 1997 were as follows:
 
<TABLE>
<CAPTION>
                                                                    U.S. GOVERNMENT SECURITIES              OTHER
                                                                   ----------------------------   --------------------------
                                                                    PURCHASES    SALES/MATURITIES  PURCHASES    SALES/MATURITIES
                                                                   -----------   --------------   -----------   ------------
<S>                                                                <C>           <C>              <C>           <C>
Money Market.....................................................  $11,015,516   $   9,068,874    $630,055,609  $616,749,955
Quality Income Plus..............................................  279,811,094     290,059,552    109,322,037   116,564,150
High Yield.......................................................      --             --          116,374,407    55,531,254
Utilities........................................................      --             --           30,364,452    72,627,579
Dividend Growth..................................................      --            3,296,094    292,543,297   157,806,480
Capital Growth...................................................      650,435         769,798     57,674,533    52,207,665
Global Dividend Growth...........................................      --             --          136,370,994    83,895,365
European Growth..................................................      --             --          105,164,853    60,919,554
Pacific Growth...................................................      --             --           47,143,990    50,453,295
Equity...........................................................      --           15,045,308    385,740,777   339,933,754
Strategist.......................................................   59,781,947     103,622,501    231,131,756   246,972,028
Capital Appreciation.............................................      --             --           15,596,012     2,692,542
Income Builder...................................................      303,829        --           19,121,215     2,648,447
</TABLE>
 
Included in the payable for investments purchased at June 30, 1997 for Capital
Growth, Global Dividend Growth, Capital Appreciation and Income Builder are
$224,659, $1,265,423, $101,348 and $142,324, respectively, for unsettled trades
with Dean Witter Reynolds Inc. ("DWR"), an affiliate of the Investment Manager.
 
Included in the receivable for investments sold at June 30, 1997 for Capital
Growth, and Dividend Growth are $150,295, and $801,998, respectively, for
unsettled trades with DWR.
 
Included in the receivable for investments sold at June 30, 1997 for Capital
Growth and Global Dividend Growth are $218,493 and $298,946, respectively, for
unsettled trades with Morgan Stanley & Co. Inc. ("Morgan Stanley"), an affiliate
of the Investment Manager since May 31, 1997.
<PAGE>
DEAN WITTER VARIABLE INVESTMENTS SERIES
NOTES TO FINANCIAL STATEMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
For the period ended June 30, 1997, the following Portfolios incurred
commissions with DWR for portfolio transactions executed on behalf of the
Portfolio:
 
<TABLE>
<CAPTION>
                                                   GLOBAL
                   DIVIDEND        CAPITAL        DIVIDEND                                     CAPITAL         INCOME
   UTILITIES        GROWTH          GROWTH         GROWTH         EQUITY       STRATEGIST    APPRECIATION     BUILDER
  -----------   --------------   ------------   ------------   ------------   ------------   ------------   ------------
  <S>           <C>              <C>            <C>            <C>            <C>            <C>            <C>
  $    20,000   $       56,305   $     14,021   $     22,044   $     28,168   $    15,800    $    12,810    $     9,925
  -----------          -------   ------------   ------------   ------------   ------------   ------------        ------
  -----------          -------   ------------   ------------   ------------   ------------   ------------        ------
</TABLE>
 
For the period May 31, 1997 through June 30, 1997, Capital Growth, Global
Dividend Growth and European Growth incurred brokerage commissions of $250,
$18,010 and $8,136, respectively, with Morgan Stanley, for portfolio
transactions executed on behalf of the Portfolio.
 
For the six months ended June 30, 1997, Pacific Growth incurred brokerage
commissions of $7,479 with affiliates of the Sub-Adviser for portfolio
transactions executed on behalf of the Portfolio.
 
Dean Witter Trust Company, an affiliate of the Investment Manager, is the Fund's
transfer agent.
 
The Fund has an unfunded noncontributory defined benefit pension plan covering
all independent Trustees of the Fund who will have served as independent
Trustees for at least five years at the time of retirement. Benefits under this
plan are based on years of service and compensation during the last five years
of service. Aggregate pension costs for the six months ended June 30, 1997
included in Trustees' fees and expenses in the Statement of Operations and the
accrued pension liability included in accrued expenses in the Statement of
Assets and Liabilities are as follows:
<TABLE>
<CAPTION>
                                                                                    QUALITY
                                                                      MONEY          INCOME          HIGH
                                                                     MARKET           PLUS           YIELD       UTILITIES
                                                                   -----------   --------------   -----------   ------------
<S>                                                                <C>           <C>              <C>           <C>
Aggregate Pension Cost...........................................  $       275   $         539    $       --    $       510
                                                                   -----------         -------    -----------        ------
                                                                   -----------         -------    -----------        ------
Accrued Pension Liability........................................  $    11,334   $      10,196    $    3,387    $     5,033
                                                                   -----------         -------    -----------        ------
                                                                   -----------         -------    -----------        ------
 
<CAPTION>
 
                                                                     GLOBAL
                                                                    DIVIDEND        EUROPEAN        PACIFIC
                                                                     GROWTH          GROWTH         GROWTH         EQUITY
                                                                   -----------   --------------   -----------   ------------
<S>                                                                <C>           <C>              <C>           <C>
Aggregate Pension Cost...........................................  $        84   $         118    $       49    $       249
                                                                   -----------         -------    -----------        ------
                                                                   -----------         -------    -----------        ------
Accrued Pension Liability........................................  $       453   $         730    $    1,235    $     5,109
                                                                   -----------         -------    -----------        ------
                                                                   -----------         -------    -----------        ------
 
<CAPTION>
 
                                                                     DIVIDEND       CAPITAL
                                                                      GROWTH         GROWTH
                                                                   ------------   ------------
<S>                                                                <C>            <C>
Aggregate Pension Cost...........................................  $       613    $        52
                                                                        ------          -----
                                                                        ------          -----
Accrued Pension Liability........................................  $     8,363    $       329
                                                                        ------          -----
                                                                        ------          -----
 
                                                                    STRATEGIST
                                                                   ------------
<S>                                                                <C>            <C>
Aggregate Pension Cost...........................................  $       432
                                                                        ------
                                                                        ------
Accrued Pension Liability........................................  $     8,111
                                                                        ------
                                                                        ------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENTS SERIES
NOTES TO FINANCIAL STATEMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
4. FEDERAL INCOME TAX STATUS
 
At December 31, 1996, the following Portfolios had an approximate net capital
loss carryover which may be used to offset future capital gains to the extent
provided by regulations:
<TABLE>
<CAPTION>
                                                                                     AMOUNTS IN THOUSANDS
                        Available through                          ---------------------------------------------------------
                          December 31,                                1997            1998           1999           2000
- -----------------------------------------------------------------  -----------   --------------   -----------   ------------
<S>                                                                <C>           <C>              <C>           <C>
Quality Income Plus..............................................      --              --             --             --
High Yield.......................................................  $   10,694    $       34,291   $     7,336   $      3,057
Pacific Growth...................................................      --              --             --             --
 
<CAPTION>
 
                        Available through
                          December 31,                                 2001           2002           2003           2004
- -----------------------------------------------------------------  ------------   ------------   ------------   ------------
<S>                                                                <C>
Quality Income Plus..............................................       --        $     24,848        --        $      2,604
High Yield.......................................................  $      4,736          3,256   $      2,984          5,521
Pacific Growth...................................................       --             --               1,398          5,350
 
<CAPTION>
 
                        Available through
                          December 31,                                TOTAL
- -----------------------------------------------------------------  ------------
Quality Income Plus..............................................  $     27,452
High Yield.......................................................        71,875
Pacific Growth...................................................         6,748
</TABLE>
 
Net capital and net currency losses incurred after October 31 ("post-October
losses") within the taxable year are deemed to arise on the first business day
of the Portfolios' next taxable year. The following Portfolios incurred and will
elect to defer post-October losses during fiscal 1996:
 
<TABLE>
<CAPTION>
                    GLOBAL
                   DIVIDEND       EUROPEAN       PACIFIC
  HIGH YIELD        GROWTH         GROWTH         GROWTH
  -----------   --------------   -----------   ------------
  <S>           <C>              <C>           <C>
  $  218,000    $       9,000    $  289,000    $   488,000
  -----------          ------    -----------   ------------
  -----------          ------    -----------   ------------
</TABLE>
 
At December 31, 1996, the primary reason(s) for significant temporary book/tax
differences were as follows:
 
<TABLE>
<CAPTION>
                                                                                 LOSS DEFERRALS
                                                                   POST-OCTOBER    FROM WASH
                                                                     LOSSES          SALES
                                                                   -----------   --------------
<S>                                                                <C>           <C>
Quality Income Plus..............................................                      -
High Yield.......................................................      -               -
Utilities........................................................                      -
Dividend Growth..................................................                      -
Capital Growth...................................................                      -
Global Dividend Growth...........................................      -               -
European Growth..................................................      -               -
Pacific Growth...................................................      -               -
Equity...........................................................                      -
Strategist.......................................................                      -
</TABLE>
 
Additionally, Global Dividend Growth, European Growth and Pacific Growth
Portfolios had temporary differences attributable to income from the
mark-to-market of passive foreign investment companies.
 
5. PURPOSES OF AND RISKS RELATING TO CERTAIN FINANCIAL INSTRUMENTS
 
Global Dividend Growth, European Growth and Pacific Growth may enter into
forward foreign currency contracts ("forward contracts") to facilitate
settlement of foreign currency denominated portfolio transactions or to manage
foreign currency exposure associated with foreign currency denominated
securities. Such Portfolios may also purchase and write put options on foreign
currencies in which the Portfolios' securities are denominated to protect
against a decline in value of such securities due to currency devaluations.
<PAGE>
DEAN WITTER VARIABLE INVESTMENTS SERIES
NOTES TO FINANCIAL STATEMENTS JUNE 30, 1997 (UNAUDITED) CONTINUED
 
Forward contracts and over-the-counter put options on foreign currencies involve
elements of market risk in excess of the amounts reflected in the Statement of
Assets and Liabilities. The Portfolios bear the risk of an unfavorable change in
the foreign exchange rates underlying the forward contracts. Risks may also
arise upon entering into these contracts and over-the-counter put options on
foreign currencies from the potential inability of the counterparties to meet
the terms of their contracts.
 
At June 30, 1997, Global Dividend Growth, European Growth and Pacific Growth had
outstanding forward contracts used to facilitate settlement of foreign currency
denominated portfolio transactions and to manage foreign currency exposure.
 
At June 30, 1997, European Growth's investments in securities of issuers in the
United Kingdom represented 32.0% of the Portfolio's net assets. The Pacific
Growth Portfolio's investments in securities of issuers in Hong Kong represented
32.1% of the Portfolio's net assets. These investments, which involve risks and
considerations not present with respect to U.S. securities, may be affected by
economic or political developments in these regions.
 
At June 30, 1997, Global Dividend Growth's, European Growth's and Pacific
Growth's cash balance consisted principally of interest bearing deposits with
Chase Manhattan Bank N.A., the custodian of each Portfolio.
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
FINANCIAL HIGHLIGHTS
 
Selected ratios and per share data for a share of beneficial interest
outstanding throughout each period:
 
<TABLE>
<CAPTION>
                               NET ASSET
                                 VALUE       NET       NET REALIZED   TOTAL FROM                  DISTRIBUTIONS  TOTAL DIVIDENDS
                               BEGINNING  INVESTMENT  AND UNREALIZED  INVESTMENT   DIVIDENDS TO        TO              AND
    YEAR ENDED DECEMBER 31     OF PERIOD    INCOME     GAIN (LOSS)    OPERATIONS   SHAREHOLDERS   SHAREHOLDERS    DISTRIBUTIONS
- --------------------------------------------------------------------------------------------------------------------------------
<S>                            <C>        <C>         <C>             <C>         <C>             <C>            <C>
MONEY MARKET
1992                           $    1.00    $0.034        --            $0.034        $(0.034)       --             $(0.034)
1993                                1.00     0.027        --             0.027        (0.027)        --             (0.027)
1994                                1.00     0.037        --             0.037        (0.037)        --             (0.037)
1995                                1.00     0.055        --             0.055        (0.055)        --             (0.055)
1996                                1.00     0.050        --             0.050        (0.050)        --             (0.050)
1997(a)                             1.00     0.025        --             0.025        (0.025)        --             (0.025)
QUALITY INCOME PLUS
1992                               10.34      0.77        $ 0.05          0.82         (0.77)        --              (0.77)
1993                               10.39      0.69          0.64          1.33         (0.69)        --              (0.69)
1994                               11.03      0.69         (1.40)        (0.71)        (0.69)        $(0.18)         (0.87)
1995                                9.45      0.72          1.50          2.22         (0.71)        --              (0.71)
1996                               10.96      0.71         (0.58)         0.13         (0.72)        --              (0.72)
1997(a)                            10.37      0.35         (0.05)         0.30         (0.35)        --              (0.35)
HIGH YIELD
1992                                6.25      0.96          0.18          1.14         (0.96)        --              (0.96)
1993                                6.43      0.81          0.68          1.49         (0.81)        --              (0.81)
1994                                7.11      0.79         (0.95)        (0.16)        (0.79)        --              (0.79)
1995                                6.16      0.80          0.08          0.88         (0.78)        --              (0.78)
1996                                6.26      0.77         (0.06)         0.71         (0.79)        --              (0.79)
1997(a)                             6.18      0.35         (0.09)         0.26         (0.35)        --              (0.35)
UTILITIES
1992                               11.47      0.51          0.88          1.39         (0.52)        --              (0.52)
1993                               12.34      0.49          1.43          1.92         (0.50)         (0.02)         (0.52)
1994                               13.74      0.53         (1.75)        (1.22)        (0.52)         (0.08)         (0.60)
1995                               11.92      0.53          2.81          3.34         (0.58)        --              (0.58)
1996                               14.68      0.55          0.70          1.25         (0.55)         (0.04)         (0.59)
1997(a)                            15.34      0.28          0.57          0.85         (0.28)         (0.21)         (0.49)
DIVIDEND GROWTH
1992                               11.00      0.37          0.51          0.88         (0.37)        --              (0.37)
1993                               11.51      0.36          1.27          1.63         (0.36)        --              (0.36)
1994                               12.78      0.38         (0.80)        (0.42)        (0.37)        --              (0.37)
1995                               11.99      0.38          3.89          4.27         (0.41)         (0.26)         (0.67)
1996                               15.59      0.41          3.22          3.63         (0.41)         (0.41)         (0.82)
1997(a)                            18.40      0.21          3.03          3.24         (0.21)         (1.00)         (1.21)
CAPITAL GROWTH
1992                               12.69      0.07          0.13          0.20         (0.08)         (0.02)         (0.10)
1993                               12.79      0.08         (0.98)        (0.90)        (0.08)        --              (0.08)
1994                               11.81      0.10         (0.26)        (0.16)        (0.10)         (0.03)         (0.13)
1995                               11.52      0.10          3.68          3.78         (0.08)        --              (0.08)
1996                               15.22      0.08          1.65          1.73         (0.03)         (0.27)         (0.30)
1997(a)                            16.65      0.02          2.57          2.59         (0.08)         (2.19)         (2.27)
</TABLE>
 
<TABLE>
<C>        <S>
- ---------------------
   (a)     For the six months ended June 30, 1997 (unaudited).
    +      Calculated based on the net asset value as of the last business day of the period.
   (1)     Not annualized.
   (2)     Annualized.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
 
<TABLE>
<CAPTION>
                                                                    RATIOS TO AVERAGE NET
                                                                           ASSETS
                                                       NET ASSETS  -----------------------
                               NET ASSET    TOTAL      AT END OF                  NET        PORTFOLIO    AVERAGE
                               VALUE END  INVESTMENT     PERIOD                INVESTMENT    TURNOVER    COMMISSION
                               OF PERIOD   RETURN+      (000'S)    EXPENSES      INCOME        RATE      RATE PAID
                               -------------------------------------------------------------------------------------
<S>                            <C>        <C>          <C>         <C>        <C>            <C>        <C>
MONEY MARKET
1992                            $  1.00      3.43  %    $  96,151   0.59  %        3.38  %     N/A          N/A
1993                               1.00      2.75         129,925   0.57           2.71        N/A          N/A
1994                               1.00      3.81         268,624   0.55           3.93        N/A          N/A
1995                               1.00      5.66         249,787   0.53           5.52        N/A          N/A
1996                               1.00      5.11         340,238   0.52           4.97        N/A          N/A
1997(a)                            1.00      2.52(1)      362,705   0.52(2)        5.02(2)     N/A          N/A
QUALITY INCOME PLUS
1992                              10.39      8.26         163,368   0.58           7.41        148  %       N/A
1993                              11.03     12.99         487,647   0.56           6.17        219          N/A
1994                               9.45     (6.63)        414,905   0.54           6.88        254          N/A
1995                              10.96     24.30         520,579   0.54           7.07        162          N/A
1996                              10.37      1.56         474,660   0.53           6.84        182          N/A
1997(a)                           10.32      3.01(1)      452,382   0.52(2)        6.87(2)      86(1)       N/A
HIGH YIELD
1992                               6.43     18.35          40,042   0.74          14.05        204          N/A
1993                               7.11     24.08          90,200   0.60          11.80        177          N/A
1994                               6.16     (2.47)        111,934   0.59          11.71        105          N/A
1995                               6.26     14.93         154,310   0.54          12.67         58          N/A
1996                               6.18     11.98         259,549   0.51          12.59         57          N/A
1997(a)                            6.09      4.48(1)      306,031   0.53(2)       12.07(2)      21(1)       N/A
UTILITIES
1992                              12.34     12.64         153,748   0.73           4.63         26         --
1993                              13.74     15.69         490,934   0.71           3.75         11         --
1994                              11.92     (9.02)        382,412   0.68           4.21         15         --
1995                              14.68     28.65         479,070   0.68           4.00         13         --
1996                              15.34      8.68         440,662   0.67           3.61          9         $0.0543
1997(a)                           15.70      5.65(1)      408,698   0.68(2)        3.62(2)       7(1)      0.0561
DIVIDEND GROWTH
1992                              11.51      8.16         192,551   0.69           3.42          4         --
1993                              12.78     14.34         483,145   0.68           3.01          6         --
1994                              11.99     (3.27)        572,952   0.64           3.13         20         --
1995                              15.59     36.38         865,417   0.61           2.75         24         --
1996                              18.40     23.96       1,288,404   0.57           2.46         23         0.0553
1997(a)                           20.43     17.68(1)    1,660,846   0.55(2)        2.21(2)      11(1)      0.0557
CAPITAL GROWTH
1992                              12.79      1.64          45,105   0.86           0.62         22         --
1993                              11.81     (6.99)         50,309   0.74           0.78         36         --
1994                              11.52     (1.28)         45,715   0.77           0.90         37         --
1995                              15.22     32.92          66,995   0.74           0.70         34         --
1996                              16.65     11.55          86,862   0.73           0.52         98         0.0570
1997(a)                           16.97     15.55(1)      102,004   0.72(2)        0.22(2)      63(1)      0.0577
</TABLE>
 
<TABLE>
<C>  <S>
- ---------------------
(a)  For the six months ended June 30, 1997 (unaudited).
 +   Calculated based on the net asset value as of the last business day of the
(1)  Not annualized.
(2)  Annualized.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
FINANCIAL HIGHLIGHTS, CONTINUED
 
Selected ratios and per share data for a share of beneficial interest
outstanding throughout each period:
 
<TABLE>
<CAPTION>
                               NET ASSET
                                 VALUE       NET       NET REALIZED   TOTAL FROM                  DISTRIBUTIONS  TOTAL DIVIDENDS
                               BEGINNING  INVESTMENT  AND UNREALIZED  INVESTMENT   DIVIDENDS TO        TO              AND
    YEAR ENDED DECEMBER 31     OF PERIOD    INCOME     GAIN (LOSS)    OPERATIONS   SHAREHOLDERS   SHAREHOLDERS    DISTRIBUTIONS
- --------------------------------------------------------------------------------------------------------------------------------
<S>                            <C>        <C>         <C>             <C>         <C>             <C>            <C>
GLOBAL DIVIDEND GROWTH
1994(b)                        $   10.00    $ 0.23        $(0.20)       $ 0.03        $(0.21)        --             $(0.21)
1995                                9.82      0.24          1.90          2.14         (0.26)        $(0.01)         (0.27)
1996                               11.69      0.24          1.75          1.99         (0.24)         (0.31)         (0.55)
1997(a)                            13.13      0.14          1.69          1.83         (0.15)         (0.60)         (0.75)
EUROPEAN GROWTH
1992                                9.89      0.08          0.32          0.40         (0.10)         (0.01)         (0.11)
1993                               10.18      0.12          3.98          4.10         (0.12)         (0.13)         (0.25)
1994                               14.03      0.17          0.96          1.13         (0.16)         (0.44)         (0.60)
1995                               14.56      0.20          3.50          3.70         (0.19)*        (0.54)         (0.73)
1996                               17.53      0.17          4.91          5.08         (0.04)         (1.01)         (1.05)
1997(a)                            21.56      0.18          2.27          2.45         (0.24)         (1.18)         (1.42)
PACIFIC GROWTH
1994(b)                            10.00      0.07         (0.74)        (0.67)       --              (0.07)         (0.07)
1995                                9.26      0.12          0.41          0.53         (0.09)        --              (0.09)
1996                                9.70      0.05          0.32          0.37         (0.11)        --              (0.11)
1997(a)                             9.96      0.08          0.12          0.20         (0.14)        --              (0.14)
EQUITY
1992                               22.14      0.23         (0.47)        (0.24)        (0.24)         (1.86)         (2.10)
1993                               19.80      0.15          3.63          3.78         (0.15)         (1.28)         (1.43)
1994                               22.15      0.23         (1.31)        (1.08)        (0.22)         (1.60)         (1.82)
1995                               19.25      0.22          7.92          8.14         (0.25)        --              (0.25)
1996                               27.14      0.16          2.70          2.86         (0.16)         (3.45)         (3.61)
1997(a)                            26.39      0.10          3.95          4.05         (0.10)         (2.08)         (2.18)
STRATEGIST
1992                               12.02      0.44          0.41          0.85         (0.45)         (0.13)         (0.58)
1993                               12.29      0.38          0.86          1.24         (0.38)         (0.47)         (0.85)
1994                               12.68      0.48          0.01          0.49         (0.46)         (0.26)         (0.72)
1995                               12.45      0.62          0.49          1.11         (0.67)         (0.44)         (1.11)
1996                               12.45      0.43          1.39          1.82         (0.43)         (0.12)         (0.55)
1997(a)                            13.72      0.25          1.02          1.27         (0.25)         (0.32)         (0.57)
CAPITAL APPRECIATION
1997(a)(c)                         10.00      0.06          0.26          0.32        --             --             --
INCOME BUILDER
1997(a)(c)                         10.00      0.17          0.62          0.79         (0.17)        --              (0.17)
</TABLE>
 
<TABLE>
<C>        <S>
- ---------------------
   (a)     For the six months ended June 30, 1997 (unaudited).
Commencement of operations:
   (b)     February 23, 1994.
   (c)     January 21, 1997.
    +      Calculated based on the net asset value as of the last business day of the period.
    *      Includes distributions in excess of net investment income of $0.02.
   (1)     Not annualized.
   (2)     Annualized.
   (3)     If the Investment Manager had not assumed all expenses and waived its management fee for the period February 23, 1994
           through May 12, 1994 for Global Dividend Growth and February 23, 1994 through August 2, 1994 for Pacific Growth, the
           ratio of expenses to average net assets would have been 0.97% for Global Dividend Growth and 1.40% for Pacific
           Growth.
   (4)     If the Investment Manager had not assumed all expenses and waived its management fee, the ratios of expenses and net
           investment income to average net assets would have been 1.37% and 0.58%, respectively, for Capital Appreciation and
           1.26% and 4.79%, respectively, for Income Builder.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
 
<TABLE>
<CAPTION>
                                                                    RATIOS TO AVERAGE NET
                                                                           ASSETS
                                                       NET ASSETS  -----------------------
                               NET ASSET    TOTAL      AT END OF                  NET        PORTFOLIO    AVERAGE
                               VALUE END  INVESTMENT     PERIOD                INVESTMENT    TURNOVER    COMMISSION
                               OF PERIOD   RETURN+      (000'S)    EXPENSES      INCOME        RATE      RATE PAID
                               -------------------------------------------------------------------------------------
<S>                            <C>        <C>          <C>         <C>        <C>            <C>        <C>
GLOBAL DIVIDEND GROWTH
1994(b)                         $  9.82      0.27  %(1)  $ 138,486  0.87  %(2)(3)      2.62  %(2)    20  %(1)    --
1995                              11.69     22.14         205,739   0.88           2.23         55         --
1996                              13.13     17.49         334,821   0.85           1.94         39         $0.0360
1997(a)                           14.21     13.98(1)      442,959   0.85(2)        2.21(2)      23(1)      0.0268
EUROPEAN GROWTH
1992                              10.18      3.99          10,686   1.73           0.74         97         --
1993                              14.03     40.88          79,052   1.28           0.97         77         --
1994                              14.56      8.36         152,021   1.16           1.49         58         --
1995                              17.53     25.89         188,119   1.17           1.25         69         --
1996                              21.56     29.99         302,422   1.11           0.97         43         0.0453
1997(a)                           22.59     11.39(1)      374,608   1.09(2)        1.96(2)      19(1)      0.0475
PACIFIC GROWTH
1994(b)                            9.26     (6.73) (1)     75,425   1.00 (2)(3      0.56(2)     22(1)      --
1995                               9.70      5.74          98,330   1.44           1.23         53         --
1996                               9.96      3.89         144,536   1.37           1.01         50         0.0108
1997(a)                           10.02      1.90(1)      138,151   1.42(2)        1.55(2)      36(1)      0.0078
EQUITY
1992                              19.80      0.05          77,527   0.62           1.22        286         --
1993                              22.15     19.72         182,828   0.58           0.69        265         --
1994                              19.25     (4.91)        225,289   0.57           1.19        299         --
1995                              27.14     42.53         359,779   0.54           0.97        269         --
1996                              26.39     12.36         521,908   0.54           0.58        279         0.0587
1997(a)                           28.26     15.39(1)      634,989   0.52(2)        0.74(2)      67(1)      0.0586
STRATEGIST
1992                              12.29      7.24         136,741   0.58           3.74         87         --
1993                              12.68     10.38         287,502   0.57           3.11         57         --
1994                              12.45      3.94         392,760   0.54           3.93        125         --
1995                              12.45      9.48         388,579   0.52           5.03        329         --
1996                              13.72     15.02         423,768   0.52           3.30        153         0.0591
1997(a)                           14.42      9.33(1)      470,969   0.52(2)        3.59(2)      79(1)      0.0586
CAPITAL APPRECIATION
1997(a)(c)                        10.32      3.20(1)       14,227   --   (2)(4      1.95 (2)(4    28(1)    0.0481
INCOME BUILDER
1997(a)(c)                        10.62      8.00(1)       20,064   --   (2)(4      6.05 (2)(4    27(1)    0.0525
</TABLE>
 
<TABLE>
<C>  <S>
- ---------------------
(a)  For the six months ended June 30, 1997 (unaudited).
(b)  February 23, 1994.
(c)  January 21, 1997.
 +   Calculated based on the net asset value as of the last business day of the
 *   Includes distributions in excess of net investment income of $0.02.
(1)  Not annualized.
(2)  Annualized.
(3)  If the Investment Manager had not assumed all expenses and waived its
(4)  If the Investment Manager had not assumed all expenses and waived its
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
<TABLE>
<CAPTION>
                              Trustees
- --------------------------------------------------------------------
<S>                                <C>
Michael Bozic                                  Dr. Manuel H. Johnson
Charles A. Fiumefreddo                             Michael E. Nugent
Edwin J. Garn                                      Philip J. Purcell
John R. Haire                                      John L. Schroeder
 
<CAPTION>
 
                              Officers
- --------------------------------------------------------------------
                       Charles A. Fiumefreddo
                CHAIRMAN AND CHIEF EXECUTIVE OFFICER
                             Barry Fink
           VICE PRESIDENT, SECRETARY AND GENERAL COUNSEL
                          Thomas F. Caloia
                             TREASURER
</TABLE>
 
<TABLE>
<S>                                                       <C>
                     Transfer Agent                                       Independent Accountants
- --------------------------------------------------------  --------------------------------------------------------
               Dean Witter Trust Company                                    Price Waterhouse LLP
         Harborside Financial Center--Plaza Two                         1177 Avenue of the Americas
             Jersey City, New Jersey 07311                                New York, New York 10036
</TABLE>
<TABLE>
<CAPTION>
                         Investment Manager
- --------------------------------------------------------------------
<S>                                <C>
                   Dean Witter InterCapital Inc.
                       Two World Trade Center
                      New York, New York 10048
 
<CAPTION>
 
                            Sub-Adviser
           (European Growth and Pacific Growth Portfolio)
- --------------------------------------------------------------------
            Morgan Grenfell Investment Services Limited
</TABLE>
 
The financial statements included herein have been taken from the records of the
Fund without examination by the independent accountants and accordingly they do
not express an opinion thereon.
 
This report is submitted for the general information of shareholders of the
Fund. For more detailed information about the Fund, its officers and trustees,
fees, expenses and other pertinent information, please see the prospectus of the
Fund.
 
This report is not authorized for distribution to prospective investors in the
Fund unless preceded or accompanied by an effective prospectus.

<PAGE>


                                DEAN WITTER
                         VARIABLE INVESTMENT SERIES

                             SEMI-ANNUAL REPORT

                               JUNE 30, 1997





Allstate Life Insurance Company of New York
P.O. Box 9095
Farmingville, NY 11738





40915A                        [DEAN WITTER LOGO]



<PAGE>


                                DEAN WITTER
                         VARIABLE INVESTMENT SERIES

                             SEMI-ANNUAL REPORT

                               JUNE 30, 1997





Northbrook Life Insurance Company
P.O. Box 94040
Palatine, IL 60094-4040





40113A                        [DEAN WITTER LOGO]







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