DEAN WITTER VARIABLE INVESTMENT SERIES
N-30D, 1996-09-09
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<PAGE>
                     DEAN WITTER VARIABLE INVESTMENT SERIES
                             Two World Trade Center
                            New York, New York 10048
 
DEAR SHAREHOLDER:
- --------------------------------------------------------------------------------
 
    Equity markets continued to perform well through mid year, given the
competitive position and strong profitability of American industry. Against this
backdrop, the Standard & Poor's 500 Composite Stock Price Index (S&P 500) was up
10.10 percent for the six months ended June 30, 1996.
 
    Notwithstanding the recent backup in U.S. interest rates, the primarily
bullish trend of equity prices is expected to remain intact until the Federal
Reserve Board moves toward a serious tightening of monetary policy. While such a
move does not appear to be on the immediate horizon, this eventuality may occur
in 1997 or 1998. The wild card continues to be the economy. Unless the economy
really picks up additional steam in the next few months, which we do not
anticipate, the Federal Reserve Board will probably remain on hold at least
until after the presidential election.
 
    After a strong first half, the economy is expected to pause for the
remainder of the year to allow pent-up consumer and capital spending demand to
rebuild. Additionally, slowing unit demand and higher wages could pressure
corporate earnings profitability and result in a diminution in capital spending.
Following this respite, a more robust, broad-based economic rebound is expected
to unfold over the course of 1997, boosted by a simultaneous recovery in
developing and developed countries alike. Against this backdrop, commodity
cyclical groups (chemicals, paper, aluminum and machinery) and commodity
technology groups (semiconductors, semiconductor capital equipment and
computers) are poised to be the standout performers in the equity arena. These
industries are expected to be driven by very inexpensive valuations and
significantly accelerating earnings resulting from robust worldwide industrial
production and capital spending.
 
    Stronger-than-anticipated employment reports, combined with robust housing,
automobile and retail sales, ignited inflationary fears and caused intermediate-
and long-term interest rates to edge higher. And higher food and energy costs
did little to allay the bond market's concerns. Further contributing to that
market's recent lackluster performance was investor anxiety over a possible
Federal Reserve Board tightening.
 
    Overall, the yield on the 30-year U.S. Treasury bond increased 92 basis
points (0.92 percentage points) from the end of 1995, to 6.87 percent as of June
30, 1996. Over the same six-month period, the yield on the two-year U.S.
Treasury note increased 96 basis points, to 6.11 percent.
 
    The first quarter of 1996 brought a change in the previous pattern of
declining money market rates. With the February employment report, which
illustrated that 705,000 new jobs had entered the market, short-term yields in
the 6- to 12-month range rose 15 to 25 basis points. At that time, many market
participants concluded that the Federal Reserve Board's monetary policy would
remain on hold.
 
    The money markets displayed stability until about the second week of June,
when employment data for May and revisions to previous data were released. A
stronger-than-expected employment trend added further support to the argument
that the second quarter's economic growth will ultimately prove to be
unsustainable. Since then, opinion has been divided as to whether the Federal
Reserve Board would keep short-term interest rates unchanged or raise them by 25
or 50 basis points sometime during the third quarter.
<PAGE>
    The economic environment in Europe over the six months ended June 30, 1996,
was mixed, with conditions varying from country to country. The U.K. economy
continued in a relatively robust pattern with a strengthening consumer sector
offsetting weak export and manufacturing sectors. The deutschemark-bloc
countries saw a marked slowdown in late 1995, which has continued well into
1996. A number of factors delayed a pickup in activity: general strikes in
France, which adversely affected output and consumer confidence; poor winter
weather in Germany, which severely disrupted the construction industry; and
widespread macroeconomic difficulties such as a global inventory correction and
the high cost-base nature of the German economy, which a slightly weaker
deutschemark could not offset.
 
    As always, political developments were dominant in Europe. In Spain and
Italy there were key elections in the spring resulting in new governmental
administrations. The economic impact of these changes will not be evident for a
while, but neither gave rise to any significant currency or bond market
turbulence.
 
    The outlook in Europe at present is for a steady economic pickup in the
second half of 1996, accelerating in 1997. Continued budgetary rigor is expected
in all countries as governments struggle to reduce deficits and prepare their
economies for possible monetary union in 1999. While this will clearly dampen
the expected recovery, interest rates are low and should help compensate
(although the interest rate cycle is expected to turn upward, possibly before
year-end). Inflation is set to remain very low.
 
    During the period under review the markets in Europe performed well. The
political changes in Spain and Italy noted above encouraged equity investors. In
France the stock market rallied strongly from a very oversold position in late
1995, with blue chip growth stocks leading the performance. In Germany growth
stocks were strong as well, and in Switzerland the sensational merger of
Ciba-Geigy AG and Sandoz AG boosted the pharmaceutical sector's performance. The
U.K. market lagged the European averages.
 
    Expectations of strong earnings rises in 1996 had to be scaled back as the
extent of the economic slowdown became evident, but we do still anticipate that
1996 will be the fourth successive year of rising earnings in Europe. The
outlook for 1997 is positive but will crucially depend on the scale and breadth
of the economic recovery.
 
    The markets of the Pacific Basin generally started 1996 as they ended 1995,
with strong positive returns in January and early February during the runup to
the Chinese New Year. The principal influences on this performance were
attractive market valuations and earnings growth forecasts, renewed flows of
international liquidity to the region and lower U.S. interest rates. Hong Kong,
which performed well in 1995, continued to lead the market advance, given its
direct tie-in to U.S. monetary policy through the pegged exchange rate.
Indonesia also was particularly strong. Among the weaker markets in the region
in the first quarter were Taiwan, owing to steadily increasing tension with
China ahead of the first-ever Taiwanese presidential election in late March, and
Korea, where political unrest and concerns about an economic slowdown remained
at high levels.
 
    Confusion at the end of the second quarter regarding the future direction of
interest rates in the United States was not expected. This, together with
further escalation in Sino-Taiwanese strains, led to a sharp pullback in
regional equity markets.
 
    The Japanese market rose by nearly 8 percent in yen terms over the six-month
period under review, encouraged by better corporate and economic numbers and
loose monetary policy. However, much of the gain was wiped out for U.S.-
dollar-based investors as the yen slipped from 103 to the U.S. dollar to 110.
 
    The economic performance of the region remains extremely robust, with gross
domestic
<PAGE>
product growth expected to remain close to 7 percent on average, fueled by
strong domestic consumption, infrastructure spending and trade, especially on an
intraregional basis. In Southeast Asia (specifically, Malaysia, Thailand and
Indonesia), growth rates are expected to decelerate slightly and the
macroeconomic imbalances that have overshadowed growth should begin to diminish,
allowing domestic interest rates to ease later in the year.
 
    Chinese economic growth has also slowed to a more sustainable,
noninflationary level of about 8 percent, down from over 13 percent two years
ago. Inflationary pressures have receded and monetary authorities are now
beginning to ease policy. A subsequent resurgence of growth in China should
underpin the region in general and Hong Kong in particular.
 
                                    EQUITIES
 
CAPITAL GROWTH PORTFOLIO
 
    For the six-month period ended June 30, 1996, the Capital Growth Portfolio
produced a total return of 8.67 percent, versus 10.10 percent for the S&P 500.
The Portfolio's slight underperformance of the Index is attributable in part to
its underweighting in the technology sector, which has now begun to correct. As
new names are added to the Portfolio and overpriced names are deleted, we expect
to see continued better performance. On June 30, 1996, the Portfolio had net
assets totaling more than $80 million. At that time, the Portfolio owned 54
stocks spread across 44 different industries.
 
    During May, the Portfolio's investment screens were relaxed in an effort to
provide a larger universe from which to pick stocks. The screens now state that
companies must have positive revenues and earnings in five out of the last eight
years; positive revenues and earnings in the last three years consecutively; and
future short- and long-term revenue and earnings growth of at least 12 percent.
As part of the Portfolio's new focus, initial positions were established in
several companies, including HFS, Inc., La Quinta Inns, Inc., Staples, Inc. and
Cisco Systems, Inc. Deleted positions included Forest Laboratories, Inc.,
Tootsie Roll Industries, Inc., UST, Inc. and U.S. Healthcare, Inc. A few other
positions have been reduced in size.
 
DIVIDEND GROWTH PORTFOLIO
 
    The Dividend Growth Portfolio had net assets in excess of $1 billion on June
30, 1996, an increase of nearly $184 million from the end of 1995. Five new
common stock positions were added to the portfolio during the past six months:
International Paper Co., American Stores Co., Ashland, Inc., Banc One Corp. and
Timken Co. Additionally, two positions were eliminated with the sale of 360
Communications Co. (a spin-off from Sprint Corp.) and Payless Shoesource, Inc.
(a spin-off from May Department Stores Co.). As of June 30, the Portfolio
consisted of 50 equity issues spread among 30 industry groups, plus 6 U.S.
Treasury bond and note issues. The Portfolio has continued to maintain a
relatively fully invested posture, with over 99 percent of total net assets
committed to longer-term investments.
 
    For the six-month period under review, the Portfolio produced a total return
of 10.23 percent, versus 10.10 percent for the S&P 500. Also, for the period
under consideration, the Portfolio ranked #25 of 76 (top 33 percent) variable
growth and income funds, according to Lipper Analytical Services, Inc. The
Portfolio has also performed well over the long term, ranking #16 of 74 (top 22
percent) funds for the 12 months ended June 30, and #11 of 33 funds (top 33
percent) for the five years ended June 30.
 
EQUITY PORTFOLIO
 
    For the six-month period ended June 30, 1996, the Equity Portfolio posted a
total return of 8.41 percent. Over the same six months, moderate levels of
inflation and corporate earnings growth helped the U.S. equity market increase
10.10 percent, as measured by the S&P 500. The Portfolio's performance relative
to its peer group continues to be impressive, with a one-year ranking in the top
17 percent of all variable growth funds as measured by Lipper Analytical
Services,
<PAGE>
Inc. (Lipper rankings are based on total return and do not reflect sales
charges.)
 
    As the first quarter of 1996 progressed, the U.S. economy gathered momentum
with employment, industrial production and consumer spending beginning to
accelerate. As evidence of an economic rebound mounted, the portfolio, which had
been balanced in a "barbell" fashion between steady growth and economically
sensitive or cyclical industries, was tilted toward the cyclical end to take
advantage of the expected growth that lay ahead. A lesser exposure to steady
growth industries was thereafter maintained, because the portfolio manager
believed that corporate earnings would decelerate as the year progressed.
 
    Steady growth groups represented in the portfolio included health care
(drugs, health care products and services and medical supplies), consumer
staples (beverages, cosmetics and household products) and consumer business
services (funeral homes, education services and data processing). These
industries historically appreciate in the face of sluggish corporate profit
growth, because of their relative earnings advantage. Financial groups such as
banks were also retained on the basis of the portfolio manager's expectation
that their earnings could continue to outpace overall profits.
 
    On the economically sensitive side, investment holdings included technology
(networking, computer software and communications) and consumer cyclicals
(automobiles, retail, apparel, airlines and lodging). The portfolio manager
focused on this area in an effort to capitalize on signs of continued capital
spending in select high-growth technology areas. Consumer cyclical industries
were purchased on the belief that the sector would experience a rebound in the
wake of rising employment. Purchases also included several stocks in the
agriculture-related, aerospace and energy industries. These industries were
purchased because they represent long-term themes relating to increased demand
emanating from the faster-growing developing countries in Asia and Latin
America.
 
    At the end of the period, significant holdings included Cisco Systems, Inc.,
Boeing Co., Tellabs, Inc., Thermo Electron Corp., Monsanto Co., Citicorp, Hilton
Hotels Corp., Microsoft Corp., Gap, Inc., Johnson & Johnson and Pfizer, Inc.
 
    The portfolio manager believes that the Portfolio is appropriately
positioned to take advantage of those steady growth industries that are still
outpacing overall corporate earnings growth and those industries that are
currently benefiting from an economic lift.
 
UTILITIES PORTFOLIO
 
    The near-consistent pressure on interest rates throughout most of the first
half of the year, combined with the general uncertainty that continues to
prevail surrounding the deregulation and forthcoming competition within nearly
all sectors of the utility industry, were the dominant factors surrounding the
relatively lackluster year-to-date market performance of the overall utilities
market. Against this backdrop, the Portfolio produced a total return of 4.07
percent for the six-month period ended June 30, 1996. Over the same period, the
S&P 500 registered a total return of 10.10 percent.
 
    Over the first half of 1996, it was a combination of the overall strength of
the economy and the correlating threat of inflation, along with the prevailing
uncertainty during the transition period from monopoly to a competitive utility
industry, that tempered the attraction of utilities investments to investors. On
balance, the electric utility industry continued to receive favorable directives
by state and federal regulators regarding the "financial formula" for
competition. However, the degree of generalities and a lack of details has kept
investors wary and generally insecure regarding dividend growth and safety. Over
the second half of the year, the portfolio manager expects more state regulatory
agencies to formally announce plans to introduce electric power
<PAGE>
competition within their respective borders and envisions few surprises
regarding timing and operating market structure.
 
    Meanwhile, the telecommunications industry has been provided new legislation
that should prompt widespread competition domestically and globally. The market
has been in a quandary, however, as a result of the mixed interpretation of the
legislation as it affects the competitive posture of the local and long-distance
companies. During the third quarter, some clarification and direction is
expected to be provided by the Federal Communications Commission, which should
relieve much of the impasse that has confronted investors. The expanding
telecommunications industry continues to be viewed as an attractive area for new
investment within the Utilities Portfolio.
 
    Natural gas stocks, particularly those of the integrated pipelines and
selective producers, have benefited from strong commodity pricing. As the
fundamental outlook for the natural gas industry strengthens and becomes more
visible over the balance of 1996, we expect additional enthusiasm for the
pipeline, producer and gatherer sectors of the natural gas industry to develop.
 
    At midyear, the Portfolio was 99 percent invested. The overall asset
allocation is 88 percent equity, 9 percent fixed income and 2 percent cash.
Within the equity component, 47 percent is allocated to electric utilities, 39
percent to telecommunications and 14 percent to natural gas. Foreign securities,
which remain heavily weighted in the telecommunications sector, account for 8
percent of net assets.
 
    Looking forward, the Portfolio will maintain its focus on a well-diversified
allocation of utility and utility-related investments. This structure is
expected to enable the Portfolio to achieve its overall objectives of relatively
low volatility, above-average income and good long-term growth.
 
                                  FIXED-INCOME
 
HIGH YIELD PORTFOLIO
 
    For the six-month period ended June 30, 1996, the High Yield Portfolio
registered a total return of 6.54 percent. Over the same period, the Lehman
Brothers Corporate/High Yield Index produced a total return of -1.18 percent.
The Portfolio's investment strategy during 1995 and the first half of 1996 has
been to capitalize on the opportunities created by the 1994 market correction by
positioning the Portfolio for a continued rebound in the high-yield market.
Despite the fact that corporate credit quality remained strong, the 1994
correction pushed yields on many B-rated issues 300 to 400 basis points higher
(to the 13 to 14 percent range) and in some cases caused bond prices to decline
by as much as 15 to 20 percent.
 
    In light of this correction, the Portfolio increased its emphasis on
discounted issues, which have helped to provide more capital appreciation
potential during the past year as the high-yield market has rebounded. While the
Portfolio is still positioned for further upside potential in the high-yield
market, it continues to maintain a sizable position in various defensive
securities, in an effort to provide the flexibility needed to take advantage of
any interim opportunities that may arise.
 
QUALITY INCOME PLUS PORTFOLIO
 
    The lower interest rate environment that prevailed throughout 1995 continued
for three days of 1996. Subsequently, there was a 95 basis point (0.95
percentage points) increase in two year U.S. Treasury notes, a greater than 100
basis point increase in both five-year and ten-year notes respectively, and a 95
basis point increase in the benchmark 30-year U.S. Treasury bond. Against this
backdrop, the Portfolio registered a total return of -3.75 percent for the first
six months of 1996. By contrast, the 10-year U.S. Treasury note returned -4.98
percent over the same time period, while the Lehman Brothers Aggregate Bond
index returned -1.21 percent.
<PAGE>
    While strong economic growth was reported during the first six months of
1996, benign inflation, as measured by the 2.8 percent rate in the Consumer
Price Index (CPI) from June 30, 1995, to June 30, 1996, continues to augur well
for the purchase of long-duration bond portfolios. The real rate of interest,
which is quite positive, emphasizes the relative value of portfolios that
contain long-dated high-quality corporate bonds for those investors with a
long-term investment horizon.
 
    The 27 to 33 percent allocation to the AAA-rated mortgage-backed securities
sector cushions the Portfolio's overall risk profile and enhances its overall
quality level to AA, as measured by Standard & Poor's Corp. The asset allocation
at the end of June was 62 percent corporate notes and bonds, 29 percent
mortgage-backed securities, 4 percent U.S. government notes and bonds, 3 percent
Yankee instruments and 2 percent cash equivalents. (A "Yankee" is a
U.S.-dollar-denominated bond issued in the United States by a foreign bank or
corporation.)
 
    During the first six months of 1996, the Portfolio's weighted average
maturity ranged from 12.6 years to 14.5 years. The portfolio manager's
diversified asset allocation strategy, which focuses principally on corporate
bonds, is reviewed on an ongoing basis. Asset shifts between sectors, as for
example sales of U.S. Treasury securities to purchase mortgage-backed
securities, occur regularly to capitalize on the constantly changing investment
horizon.
 
                                ASSET ALLOCATION
 
STRATEGIST PORTFOLIO
 
    For the six-month period ended June 30, 1996, the Strategist Portfolio
provided a total return of 5.73 percent. This compares favorably with a fixed
balance fund (5.02 percent) comprised of the S&P 500 (55 percent), the Lehman
Brothers Government/Corporate Bond Index (35 percent) and commercial paper (10
percent).
 
    The Portfolio adopted Dean Witter Strategist Fund's management discipline on
September 1, 1995, and has adhered to the same allocation target as that fund
since that date. At the conclusion of the period under review, the Portfolio's
asset allocation target was 67 percent equities, 26 percent bonds and 7 percent
cash investments. While the equity weighting was reduced slightly and bonds
increased a bit in the first half of 1996, no major strategic allocation shifts
were made. As a result, the Portfolio continues to overweight equities and
slightly underweight bonds and cash. Benign inflation, a lack of restrictive
Federal Reserve Board policy moves and corporate earnings growth in a range of 8
to 9 percent combined to provide a backdrop consistent with the portfolio's
manager's expectation of roughly twice the total return potential in equity
investments versus bonds, and four times the total return potential versus cash.
 
    The Portfolio's equity component is concentrated in five broad economic
sectors that the portfolio manager believes are poised to outperform the overall
market because of better-than-average earnings growth prospects. Consumer
cyclicals such as retailers (Dayton-Hudson Corp.), automobiles (Ford Motor Co.)
and leisure industries (Carnival Corp.) make up 26 percent of the equity
portfolio and are followed, in order of exposure, by consumer staples (22
percent) such as pharmaceuticals (Lilly (Eli) & Co.) and personal care companies
(Colgate-Palmolive Co.); technology companies (18 percent) such as Microsoft
Corp. and Gateway 2000, Inc.; industrial companies (15 percent) such as Emerson
Electric Co. and Watkins-Johnson Co.; and energy companies (11 percent) like
Texaco, Inc. and Exxon Corp. Underweighted sectors include financials, basis
materials and utilities.
 
    The bond component of the Portfolio, with over 25 issues, is well
diversified among U.S. government and corporate credits as well as foreign
bonds. At the end of June, the fixed-income component's average coupon was 7.7
percent while the average duration stood at 5.9 years, slightly longer than the
Lehman Brothers Government/Corporate Bond Index. (Duration is a measure of a
bond fund's sensitivity to interest-rate
<PAGE>
fluctuations. Generally, to determine this impact you would multiply the fund's
duration by the percentage rates rise or fall).
 
    The second half of 1996 is expected to be dominated by Federal Reserve Board
commentary (and perhaps action), as well as the national elections in November.
In this environment, equity investments are anticipated to continue to
outperform both bonds and cash. We would also expect that some of the losses
suffered by the bond market in the first half of the year may be reversed. The
Portfolio is positioned to benefit from these trends.
 
                              GLOBAL/INTERNATIONAL
 
GLOBAL DIVIDEND GROWTH PORTFOLIO
 
    For the six months ended June 30, 1996, the Global Dividend Growth Portfolio
posted a total return of 8.25 percent, compared to 6.25 percent for the Morgan
Stanley Capital International World Index. Since inception (February 23, 1994),
through June 30, 1996, the Portfolio's cumulative total return was 32.57
percent, versus 25.18 percent for the World Index.
 
    The Portfolio employs stringent screening processes to help discover
attractive opportunities in high-quality common stocks in the world's largest
and most developed markets. The Portfolio currently owns 123 issues in 12
different countries. Some examples of stocks owned include Sprint Corp. and
Monsanto Co. in the United States, Sony Corp. and Honda Motor Co. in Japan,
British Telecommunications PLC and National Westminster Bank PLC in the United
Kingdom, Hugo Boss AG and Bayer AG in Germany, Royal Dutch Petroleum Co. in the
Netherlands and Nestle AG in Switzerland.
 
    Several country allocation targets were revised in January following a
reassessment of the Portfolio's strategic weightings. Assets committed to Japan
and Italy were increased by 2 percent each, to 26 percent and 4 percent of the
Portfolio's net assets, respectively. Offsetting these moves, assets committed
to Switzerland and the U.K. were decreased by 2 percent each, to 2 percent and
10 percent of the Portfolio's net assets, respectively. A combination of factors
in these countries, dominated by valuation-related measures, dictated these
changes.
 
EUROPEAN GROWTH PORTFOLIO
 
    The European Growth Portfolio produced a total return of 13.52 percent over
the six-month period ended June 30, 1996. The Portfolio ranked #12 of 71 (top 17
percent) Variable International Funds for that period, according to Lipper
Analytical Services, Inc. Longer term, the Portfolio's relative performance
remains impressive. For the 12 months ended June 30, 1996, the Portfolio ranked
#6 of 68 funds (top 9 percent) and for the five years through June 30 it ranked
#1 of 14 funds. (Lipper data are based on total return and do not reflect sales
charges.)
 
    During the period under review, the Portfolio's sector weightings were
adjusted to reflect the changing investment environment. Exposure to the
financial and interest-rate-sensitive sectors was reduced via sales of bank
holdings such as Den Danske Bank (Denmark) and Bayerische Vereinsbank (Germany),
as well as reductions to large positions in Banco Bilbao Vizcaya and Banco
Popular Espanol S.A. (Spain).
 
    The process of widening the Portfolio's stock holdings to encompass more
cyclical and economically sensitive names has been advanced via the purchase of
Usinor Sacilor in France, one of Europe's largest and most cost-efficient steel
manufacturers, and SGL Carbon AG in Germany, a highly specialized industrial
materials company. Strong performance was seen over the past six months from
some of the Portfolio's large-capitalization growth holdings such as Securitas
AB, a Swedish security services company, Hennes & Mauritz AB, a pan-European
fashion retailer and Gas Natural SDG S.A., a Spanish utility.
 
    The emphasis in terms of capitalization remains primarily in the large- and
mid-cap sectors. The currency hedge involving the French
<PAGE>
franc was reduced toward the end of the second quarter given the subadviser's
(Morgan Grenfell Investment Services Limited) view that the period of maximum
U.S. dollar strength in 1996 had passed. The Portfolio's stock holdings will
likely be widened during the second half to hold more economically sensitive and
cyclical stocks to anticipate rising 1997 earnings. Financial and
interest-rate-sensitive sectors will continue to be underweighted. Stock
selection will continue to be the main focus to achieve added value over the
index return.
 
PACIFIC GROWTH PORTFOLIO
 
    The Pacific Growth Portfolio registered a total return of 7.01 percent for
the six-month period ended June 30, 1996.
 
    Of the major markets, the Portfolio's subadviser, Morgan Grenfell Investment
Services Limited, currently favors Hong Kong, in which the Portfolio holds the
maximum weighting permitted by the prospectus (21.1 percent of total assets). At
the end of the period under review, the Portfolio also had overweighted
positions in Indonesia (8.1 percent of total assets), South Korea (5.4 percent).
Morgan Grenfell is also encouraged by the prospects in China, where property
market data and lower inflation numbers are cause for optimism. The Portfolio
also has modest exposure to Australia (1.5 percent), reflecting expectations of
growing demand for natural resources as the global economy gradually recovers.
 
    At the sector/stock level, Morgan Grenfell currently favors residential real
estate and bank shares in Hong Kong, such as Cheung Kong (Holdings) Ltd. and Dao
Heng Bank Group Ltd. The building materials sector is overweighted in Indonesia,
while gaming stocks are favored in Malaysia. In Japan, the Portfolio retains an
overweighting in small-cap issues, which Morgan Grenfell believes are heavily
undervalued relative to the rest of the market. Following significant U.S.
dollar strength, currency hedges were removed.
 
                                 MONEY MARKETS
 
MONEY MARKET PORTFOLIO
 
    As of June 30, 1996, the Money Market Portfolio had assets in excess of $286
million and an average life of 68 days. The Portfolio's yield for the 12-months
ended June 30, 1996, was 4.85 percent. Its annualized yield for the month of
June was 4.87 percent.
 
    Rates available on money market securities held remarkably stable during the
second half of 1995, then declined by about 25 basis points (0.25 percentage
points) during January and February 1996. For the following four months, yields
again remained fairly steady but showed some firming during June. As the
economic data continued on balance to register stronger-than-expected trends, a
more positively shaped yield curve developed in the money market, with most of
the change occurring in maturities of 4 to 12 months.
 
    Payroll employment data announced during the first half of 1996 was quite
strong. Average monthly job gains for the first six months of 1996 exceeded
230,000, with particularly strong growth in February (509,000) and May
(365,000). The June employment report, which featured a drop in the unemployment
rate to a six-year low of 5.3 percent, the largest average hourly earnings
increase on record (9 cents) and a 0.5 hour increase in the average workweek,
seemed to heighten market sentiment that the Federal Reserve Board might raise
short-term interest rates before the end of 1996.
 
    On June 30, 1996, approximately 76 percent of the Portfolio was invested in
high-quality commercial paper, 14 percent in short-term bank notes and
certificates of deposit issued by financially strong major commercial banks and
7 percent in bankers' acceptances issued by such institutions. The remaining 3
percent was invested in federal agency obligations.
 
    At the end of the period under review, more than 85 percent of the
Portfolio's assets were scheduled to mature in less than four months.
<PAGE>
Therefore, the Portfolio is well positioned for stability of value, with a high
degree of liquidity. We continue to operate the Portfolio in a straightforward,
conservative style without "structured" notes or derivative securities which can
fluctuate excessively when interest rates change.
 
    At this time, we anticipate a moderate pace for economic activity during the
second half of 1996, with no major adverse changes in the rate of inflation.
Investment yields available to the Portfolio during the second half of 1996
could be slightly higher than those achieved during the first half of 1996. We
believe that the Portfolio continues to be a very useful investment for
liquidity, preservation of capital and a yield that will reflect prevailing
money market conditions.
 
    We appreciate your support of Dean Witter Variable Investment Series and
look forward to continuing to serve your investment needs and objectives.
 
Very truly yours,
 
      [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 net asset values 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--MONEY MARKET
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED)
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                        ANNUALIZED
 PRINCIPAL                                                                YIELD
AMOUNT (IN                                                              ON DATE OF        MATURITY
THOUSANDS)                                                               PURCHASE           DATE               VALUE
- -----------                                                            ------------  -------------------  ---------------
<C>          <S>                                                       <C>           <C>                  <C>
             COMMERCIAL PAPER (76.1%)
             AUTOMOTIVE - FINANCE (8.3%)
 $  10,275   Ford Motor Credit Co....................................   5.34-5.46 %   07/18/96-10/08/96   $    10,176,702
    13,715   General Motors Acceptance Corp..........................   5.05-5.55     07/11/96-12/16/96        13,552,110
                                                                                                          ---------------
                                                                                                               23,728,812
                                                                                                          ---------------
             BANK HOLDING COMPANIES (13.6%)
     4,100   Bank of New York Co., Inc...............................      5.47           09/03/96              4,059,410
     6,485   Chase Manhattan Corp....................................   5.39-5.46     08/19/96-11/01/96         6,409,042
     4,000   Fleet Financial Group, Inc..............................      5.41           07/25/96              3,984,573
     4,120   Morgan (J.P.) & Co. Inc.................................      5.39           09/03/96              4,079,967
     9,390   NationsBank Corp........................................   5.45-5.75     11/20/96-02/28/97         9,109,865
     5,050   PNC Funding Corp........................................      5.53           09/27/96              4,981,194
     6,160   U.S. Bancorp............................................      5.34           07/09/96              6,151,000
                                                                                                          ---------------
                                                                                                               38,775,051
                                                                                                          ---------------
             BANKS - COMMERCIAL (13.4%)
     3,000   Abbey National North America Corp.......................      5.48           11/04/96              2,943,147
     5,000   ABN - AMRO North America Finance Inc....................      5.00           10/07/96              4,932,778
     6,270   Canadian Imperial Holdings Inc..........................   5.37-5.52     08/26/96-09/09/96         6,210,609
     4,820   Commerzbank U.S. Finance Inc............................      5.35           07/01/96              4,818,586
     3,000   Dresdner U.S. Finance Inc...............................      5.06           08/26/96              2,976,172
     3,000   National Austrialia Funding (DE) Inc....................      5.11           08/05/96              2,984,583
     5,130   Toronto - Dominion Holdings USA Inc.....................      5.35           08/15/96              5,094,637
     8,535   WestPac Capital Corp....................................   5.45-5.47     09/10/96-11/20/96         8,384,549
                                                                                                          ---------------
                                                                                                               38,345,061
                                                                                                          ---------------
             BROKERAGE (6.1%)
     8,120   Goldman Sachs Group L.P.................................   5.36-5.40     07/08/96-09/04/96         8,076,786
     9,370   Morgan Stanley Group, Inc...............................   5.35-5.37     07/02/96-08/23/96         9,319,928
                                                                                                          ---------------
                                                                                                               17,396,714
                                                                                                          ---------------
             CHEMICALS (1.9%)
     3,200   Du Pont (E.I.) de Nemours & Co..........................      5.36           07/23/96              3,188,693
     2,365   Monsanto Co.............................................      5.35           07/16/96              2,359,103
                                                                                                          ---------------
                                                                                                                5,547,796
                                                                                                          ---------------
             FINANCE - COMMERCIAL (2.3%)
     6,685   CIT Group Holdings, Inc.................................      5.43       08/19/96-08/27/96         6,629,877
                                                                                                          ---------------
             FINANCE - CONSUMER (13.0%)
    11,870   American Express Credit Corp............................   4.97-5.55     07/01/96-10/30/96        11,789,911
     3,090   Avco Financial Services Inc.............................      5.39           08/07/96              3,072,191
     2,230   Beneficial Corp.........................................      5.36           08/06/96              2,217,619
    10,640   Household Finance Corp..................................   5.32-5.50     07/19/96-10/17/96        10,564,973
     9,440   Norwest Financial Inc...................................   5.29-5.41     07/10/96-08/13/96         9,405,987
                                                                                                          ---------------
                                                                                                               37,050,681
                                                                                                          ---------------
             FINANCE - CORPORATE (1.6%)
     4,520   Ciesco, L.P.............................................      5.46           09/17/96              4,465,861
                                                                                                          ---------------
             FINANCE - DIVERSIFIED (4.8%)
     2,000   Associates Corp. of North America.......................      5.19           07/29/96              1,991,533
    12,015   General Electric Capital Corp...........................   5.13-5.81     08/02/96-02/10/97        11,815,192
                                                                                                          ---------------
                                                                                                               13,806,725
                                                                                                          ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--MONEY MARKET
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                        ANNUALIZED
 PRINCIPAL                                                                YIELD
AMOUNT (IN                                                              ON DATE OF        MATURITY
THOUSANDS)                                                               PURCHASE           DATE               VALUE
- -----------                                                            ------------  -------------------  ---------------
<C>          <S>                                                       <C>           <C>                  <C>
             FINANCE - EQUIPMENT (1.0%)
 $   3,000   Deere (John) Capital Corp...............................      5.41   %       08/12/96        $     2,980,530
                                                                                                          ---------------
             OFFICE EQUIPMENT (3.7%)
    10,655   IBM Credit Corp.........................................   5.35-5.42     07/16/96-08/21/96        10,618,229
                                                                                                          ---------------
             RETAIL (4.8%)
    13,850   Sears Roebuck Acceptance Corp...........................   5.37-5.44     07/22/96-09/26/96        13,741,607
                                                                                                          ---------------
             TELEPHONES (0.7%)
     2,000   Ameritech Corp..........................................      5.33           07/30/96              1,990,993
                                                                                                          ---------------
             UTILITIES - FINANCE (0.9%)
     2,680   National Rural Utilities Cooperative Finance Corp.......      5.34           07/17/96              2,672,938
                                                                                                          ---------------
             TOTAL COMMERCIAL PAPER (AMORTIZED COST $217,750,875).......................................      217,750,875
                                                                                                          ---------------
</TABLE>
 
<TABLE>
<CAPTION>
<C>          <S>                                                       <C>           <C>                  <C>
             SHORT-TERM BANK NOTES (8.3%)
     4,975   Bank of New York........................................      5.34           07/15/96              4,975,000
     9,500   F.C.C. National Bank....................................   5.34-5.47     07/12/96-09/13/96         9,500,000
     4,000   First National Bank of Chicago..........................      5.45           11/29/96              4,000,000
     3,135   First Union National Bank...............................      5.00           08/15/96              3,135,000
     2,220   La Salle National Bank..................................      5.43           09/12/96              2,220,000
                                                                                                          ---------------
             TOTAL SHORT-TERM BANK NOTES (AMORTIZED COST $23,830,000)...................................       23,830,000
                                                                                                          ---------------
</TABLE>
 
<TABLE>
<CAPTION>
<C>          <S>                                                       <C>           <C>                  <C>
             BANKERS' ACCEPTANCES (7.1%)
     7,000   First Bank, N.A.........................................      5.43           10/11/96              6,893,025
    13,500   First National Bank of Boston...........................   5.26-5.61     07/15/96-12/03/96        13,348,341
                                                                                                          ---------------
             TOTAL BANKERS' ACCEPTANCES (AMORTIZED COST $20,241,366)....................................       20,241,366
                                                                                                          ---------------
</TABLE>
 
<TABLE>
<CAPTION>
<C>          <S>                                                       <C>           <C>                  <C>
             CERTIFICATES OF DEPOSIT (5.9%)
     5,835   Chase Manhattan Bank (USA)..............................      5.38           09/18/96              5,835,000
     6,000   Old Kent Bank (Michigan)................................      5.40           09/30/96              6,000,000
     5,000   Union Bank of California, N.A...........................      5.47           09/11/96              5,000,000
                                                                                                          ---------------
             TOTAL CERTIFICATES OF DEPOSIT (AMORTIZED COST $16,835,000).................................       16,835,000
                                                                                                          ---------------
</TABLE>
 
<TABLE>
<CAPTION>
<C>          <S>                                                       <C>           <C>                  <C>
             U.S. GOVERNMENT AGENCIES (2.7%)
     3,675   Federal Farm Credit Bank................................      5.49           11/27/96              3,594,844
     4,100   Federal National Mortgage Assoc.........................   5.23-5.25     08/29/96-11/21/96         4,031,635
                                                                                                          ---------------
             TOTAL U.S. GOVERNMENT AGENCIES (AMORTIZED COST $7,626,479).................................        7,626,479
                                                                                                          ---------------
 
TOTAL INVESTMENTS (AMORTIZED COST $286,283,720) (A)....................      100.1%    286,283,720
 
LIABILITIES IN EXCESS OF CASH AND OTHER ASSETS.........................       (0.1)       (129,322)
                                                                         ----------  -------------
NET ASSETS.............................................................      100.0%  $ 286,154,398
                                                                         ----------  -------------
                                                                         ----------  -------------
<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, 1996 (UNAUDITED)
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
 PRINCIPAL
AMOUNT (IN                                                                  COUPON         MATURITY
THOUSANDS)                                                                   RATE            DATE               VALUE
- -----------                                                               ----------  -------------------  ---------------
<C>          <S>                                                          <C>         <C>                  <C>
             CORPORATE BONDS (61.6%)
             AUTOMOTIVE (0.2%)
 $   1,000   Ford Motor Co..............................................       8.875%      01/15/22        $     1,124,040
                                                                                                           ---------------
             BANK HOLDING COMPANIES (5.9%)
     1,000   Banc One Corp..............................................       8.74        09/15/03              1,089,660
     1,000   BankAmerica Corp...........................................       9.625       02/13/01              1,106,050
     2,000   Boatmen's Bancshares, Inc..................................       9.25        11/01/01              2,194,980
     1,000   CoreStates Financial Corp..................................       9.625       02/15/01              1,104,900
     5,000   First Bank, N.A............................................       8.35        11/01/04              5,313,450
     4,000   Fleet Mortgage Group, Inc..................................       6.50        09/15/99              3,977,600
     2,000   Huntington National Bank...................................       7.625       01/15/03              2,048,380
     3,000   Marshall & Ilsley Corp.....................................       6.375       07/15/03              2,881,980
     3,145   PNC Funding Corp...........................................       9.875       03/01/01              3,500,070
     5,000   State Street Boston Corp...................................       5.95        09/15/03              4,673,350
                                                                                                           ---------------
                                                                                                                27,890,420
                                                                                                           ---------------
             BANKS (4.1%)
     4,000   Bankers Trust New York Corp................................       7.375       05/01/08              3,927,440
     4,000   Bankers Trust New York Corp................................       7.50        11/15/15              3,829,880
     3,000   Old Kent Financial Corp....................................       6.625       11/15/05              2,825,580
     2,000   Society National Bank......................................       6.75        06/15/03              1,959,940
     2,000   Wachovia Corp..............................................       6.375       04/15/03              1,925,900
     5,000   Wachovia Corp..............................................       6.80        06/01/05              4,860,650
                                                                                                           ---------------
                                                                                                                19,329,390
                                                                                                           ---------------
             BEVERAGES - SOFT DRINKS (0.5%)
     2,000   Coca-Cola Enterprises, Inc.................................       8.50        02/01/22              2,205,860
                                                                                                           ---------------
             BROKERAGE (2.8%)
     1,000   Bear Stearns Companies, Inc................................       9.125       04/15/98              1,043,760
     4,000   Bear Stearns Companies, Inc................................       6.625       01/15/04              3,808,160
     2,000   Donaldson, Lufkin & Jenrette, Inc..........................       6.875       11/01/05              1,897,900
     5,000   Lehman Brothers Holdings Inc...............................       8.50        08/01/15              5,132,150
     1,000   Morgan Stanley Group, Inc..................................       9.25        03/01/98              1,045,270
                                                                                                           ---------------
                                                                                                                12,927,240
                                                                                                           ---------------
             ENTERTAINMENT/MEDIA (1.0%)
     5,000   Walt Disney Co.............................................       7.55        07/15/93              4,833,400
                                                                                                           ---------------
             FINANCIAL SERVICES (10.5%)
     5,000   Aristar, Inc...............................................       6.30        07/15/00              4,897,150
     1,000   Associates Corp. of North America..........................       6.75        10/15/99              1,002,430
     3,000   Equifax, Inc...............................................       6.50        06/15/03              2,896,170
     3,000   Ford Capital BV............................................       9.50        06/01/10              3,470,280
     3,000   Ford Motor Credit Co.......................................       8.20        02/15/02              3,160,410
     3,000   General Motors Acceptance Corp.............................       9.00        10/15/02              3,279,750
     3,500   Household Finance Corp.....................................       7.75        06/01/99              3,596,250
     2,000   Household Finance Corp.....................................       8.95        09/15/99              2,126,020
     3,500   Household Finance Corp.....................................       8.45        12/10/02              3,727,780
     4,000   ITT Hartford Group Inc.....................................       6.375       11/01/02              3,853,360
     5,000   Lumbermens Mutual Casualty - 144A*.........................       9.15        07/01/26              5,183,400
     5,000   Metropolitan Life Insurance Co. - 144A*....................       7.70        11/01/15              4,842,350
     4,000   Norwest Financial Inc......................................       7.875       02/15/02              4,173,200
     3,000   Travelers Group, Inc.......................................       7.75        06/15/99              3,085,680
                                                                                                           ---------------
                                                                                                                49,294,230
                                                                                                           ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--QUALITY INCOME PLUS
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 PRINCIPAL
AMOUNT (IN                                                                  COUPON         MATURITY
THOUSANDS)                                                                   RATE            DATE               VALUE
- -----------                                                               ----------  -------------------  ---------------
<C>          <S>                                                          <C>         <C>                  <C>
             FOOD SERVICES (0.2%)
 $   1,000   McDonald's Corp............................................       8.875%      04/01/11        $     1,140,400
                                                                                                           ---------------
             FOODS (1.4%)
    10,000   Archer-Daniels-Midland Co..................................       0.00        05/01/02              6,744,700
                                                                                                           ---------------
             HEALTHCARE - DIVERSIFIED (0.7%)
     2,000   Kaiser Foundation Health Plan, Inc.........................       9.00        11/01/01              2,185,120
     1,000   Kaiser Foundation Health Plan, Inc.........................       9.55        07/15/05              1,156,800
                                                                                                           ---------------
                                                                                                                 3,341,920
                                                                                                           ---------------
             INDUSTRIALS (14.0%)
     4,000   Becton, Dickinson & Co.....................................       8.70        01/15/25              4,241,160
     5,000   Boeing Co..................................................       7.95        08/15/24              5,384,000
     2,000   Burlington Resources, Inc..................................       7.15        05/01/99              2,021,120
     1,000   Caterpillar, Inc...........................................       9.375       07/15/01              1,101,780
     3,000   Caterpillar, Inc...........................................       9.375       08/15/11              3,487,560
     5,000   Columbia/HCA Healthcare Corp...............................       9.00        12/15/14              5,676,200
     5,000   General Motors Corp........................................       7.70        04/15/16              4,963,050
     4,000   IBP Inc....................................................       7.125       02/01/26              3,625,040
     3,000   Lockheed Martin Corp.......................................       7.70        06/15/08              3,054,120
     2,000   Lockheed Martin Corp.......................................       7.65        05/01/16              1,985,180
     5,000   Lockheed Martin Corp.......................................       7.875       03/15/23              4,849,300
     5,000   Lockheed Martin Corp.......................................       7.20        05/01/36              4,972,500
     1,000   Maytag Corp................................................       9.75        05/15/02              1,118,920
     5,000   Philip Morris Companies, Inc...............................       7.50        01/15/02              5,114,900
     5,000   Philip Morris Companies, Inc...............................       7.125       10/01/04              4,985,500
     5,000   Raytheon Co................................................       7.375       07/15/25              4,755,800
     5,000   Seagram Co. Ltd............................................       6.875       09/01/23              4,494,950
                                                                                                           ---------------
                                                                                                                65,831,080
                                                                                                           ---------------
             OIL INTEGRATED - DOMESTIC (0.4%)
       578   Mobil Corp.................................................       9.17        02/29/00                607,822
     1,000   Texaco Capital, Inc........................................       9.75        03/15/20              1,234,130
                                                                                                           ---------------
                                                                                                                 1,841,952
                                                                                                           ---------------
             PHARMACEUTICALS (2.2%)
     5,000   Johnson & Johnson..........................................       8.72        11/01/24              5,428,900
       797   Marion Merrell Corp........................................       9.11        08/01/05                865,823
     1,000   McKesson Corp..............................................       8.625       02/01/98              1,032,580
     3,000   Zeneca Wilmington, Inc.....................................       7.00        11/15/23              2,776,740
                                                                                                           ---------------
                                                                                                                10,104,043
                                                                                                           ---------------
             REAL ESTATE INVESTMENT TRUST (1.0%)
     5,000   Kimco Realty Corp..........................................       6.50        10/01/03              4,722,300
                                                                                                           ---------------
             RETAIL (3.0%)
     5,000   May Department Stores......................................       7.625       08/15/13              5,000,800
     5,000   May Department Stores......................................       7.50        06/01/15              4,899,750
     1,000   Penney (J.C.) Co., Inc.....................................       9.75        06/15/21              1,116,370
     3,000   Wal-Mart Stores, Inc.......................................       7.49        06/21/07              3,072,210
                                                                                                           ---------------
                                                                                                                14,089,130
                                                                                                           ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--QUALITY INCOME PLUS
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 PRINCIPAL
AMOUNT (IN                                                                  COUPON         MATURITY
THOUSANDS)                                                                   RATE            DATE               VALUE
- -----------                                                               ----------  -------------------  ---------------
<C>          <S>                                                          <C>         <C>                  <C>
             TELECOMMUNICATIONS (4.4%)
 $   5,000   AT&T Corp..................................................       8.35%       01/15/25        $     5,222,950
     2,000   BellSouth Telecommunications, Inc..........................       7.00        12/01/95              1,842,020
     5,000   GTE North Inc..............................................       7.625       05/15/26              4,903,050
     4,000   Northern Telecom, Ltd. (Canada)............................       7.875       06/15/26              4,094,520
     5,000   Southwestern Bell Telephone Co.............................       6.625       09/01/24              4,409,250
                                                                                                           ---------------
                                                                                                                20,471,790
                                                                                                           ---------------
             TRANSPORTATION (1.4%)
     4,998   Burlington Northern Sante Fe Corp..........................       7.97        01/01/15              5,193,295
     1,000   Consolidated Rail Corp.....................................       9.75        06/15/20              1,209,670
                                                                                                           ---------------
                                                                                                                 6,402,965
                                                                                                           ---------------
             UTILITIES - ELECTRIC (6.7%)
     1,000   Chugach Electric Co........................................       9.14        03/15/22              1,083,250
     3,750   Consolidated Edison Co. of New York, Inc...................       8.05        12/15/27              3,685,761
     4,000   Duke Power Co..............................................       8.625       03/01/22              4,107,600
     5,000   Florida Power & Light Co...................................       7.05        12/01/26              4,591,550
     1,260   Georgia Power Co...........................................       8.625       06/01/22              1,276,884
     5,000   National Rural Utilities Cooperative Finance Corp..........       6.50        09/15/02              4,889,000
     2,500   Pacific Gas & Electric Co..................................       7.25        08/01/26              2,289,650
     5,000   Pennsylvania Power & Light Co..............................       7.70        10/01/09              5,137,900
     5,000   Public Service Electric & Gas Co...........................       6.75        01/01/16              4,486,600
                                                                                                           ---------------
                                                                                                                31,548,195
                                                                                                           ---------------
             WASTE DISPOSAL (1.2%)
     5,000   Browning Ferris Industries, Inc............................       9.25        05/01/21              5,850,050
                                                                                                           ---------------
             TOTAL CORPORATE BONDS (IDENTIFIED COST $286,026,180)........................................      289,693,105
                                                                                                           ---------------
</TABLE>
 
<TABLE>
<CAPTION>
<C>          <S>                                                          <C>         <C>                  <C>
             U.S. GOVERNMENT & AGENCIES OBLIGATION (31.3%)
        41   Federal Home Loan Mortgage Corp............................      11.50    06/01/11-05/01/19            45,614
       554   Federal Home Loan Mortgage Corp. PC Gold...................       6.50    01/01/24-09/01/24           518,616
    12,538   Federal Home Loan Mortgage Corp. PC Gold...................       8.00    04/01/24-05/01/26        12,647,930
     3,550   Federal Home Loan Mortgage Corp. PC Gold...................       8.50    01/01/22-12/01/24         3,645,028
     2,000   Federal National Mortgage Assoc. (Principal Strip).........       0.00        08/21/01              1,986,900
    30,000   Federal National Mortgage Assoc. (Principal Strip).........       0.00        10/09/19              5,446,875
     9,000   Federal National Mortgage Assoc............................       7.50        07/01/26              8,881,875
    16,785   Federal National Mortgage Assoc............................       8.00    05/01/16-09/01/25        16,910,744
     1,884   Federal National Mortgage Assoc............................       9.00    06/01/21-02/01/25         1,964,369
     5,299   Government National Mortgage Assoc.........................       6.50    04/15/24-05/15/26         4,930,639
    38,580   Government National Mortgage Assoc.........................       7.00    10/15/22-07/15/26        37,000,270
    23,369   Government National Mortgage Assoc.........................       7.50    10/15/21-07/15/26        23,032,691
    10,287   Government National Mortgage Assoc.........................       8.00    10/15/24-06/15/26        10,376,549
     5,614   Government National Mortgage Assoc.........................       8.50    01/15/17-07/15/26         5,771,758
     3,852   Government National Mortgage Assoc.........................       9.00    07/15/24-12/15/24         4,031,461
       212   Government National Mortgage Assoc.........................       9.50    07/15/17-04/15/20           227,013
       220   Government National Mortgage Assoc.........................      10.00    05/15/16-04/15/19           239,430
     5,000   Tennessee Valley Authority.................................       7.85        06/15/44              4,935,943
     5,000   U.S. Treasury Bond.........................................       6.00        02/15/26              4,435,156
                                                                                                           ---------------
             TOTAL U.S. GOVERNMENT & AGENCIES OBLIGATION
               (IDENTIFIED COST $147,874,510)............................................................      147,028,861
                                                                                                           ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--QUALITY INCOME PLUS
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 PRINCIPAL
AMOUNT (IN                                                                  COUPON         MATURITY
THOUSANDS)                                                                   RATE            DATE               VALUE
- -----------                                                               ----------  -------------------  ---------------
<C>          <S>                                                          <C>         <C>                  <C>
             FOREIGN GOVERNMENT & AGENCIES OBLIGATIONS (3.4%)
 $   5,000   Hydro-Quebec (Canada)......................................       9.50%       11/15/30        $     5,872,000
     3,000   Italy (Republic of)........................................       6.875       09/27/23              2,822,580
     5,000   Province of New Brunswick (Canada).........................       7.625       06/29/04              5,158,450
     2,000   Quebec Province (Canada)...................................       7.50        07/15/23              1,908,540
                                                                                                           ---------------
             TOTAL FOREIGN GOVERNMENT & AGENCIES OBLIGATIONS
               (IDENTIFIED COST $14,653,330).............................................................       15,761,570
                                                                                                           ---------------
</TABLE>
 
<TABLE>
<CAPTION>
<C>          <S>                                                          <C>         <C>                  <C>
             SHORT-TERM INVESTMENTS (1.5%)
             COMMERCIAL PAPER (A) (0.8%)
             AUTOMOTIVE - FINANCE
     4,000   Ford Motor Credit Co.......................................       5.29        07/15/96              3,991,772
                                                                                                           ---------------
             U.S. GOVERNMENT AGENCY (A) (0.6%)
     3,000   Federal Farm Credit Bank...................................       5.24        07/15/96              2,993,886
                                                                                                           ---------------
             REPURCHASE AGREEMENT (0.1%)
       298   The Bank of New York (dated 06/28/96; proceeds $298,195;
               collateralized by $302,726 U.S. Treasury Note 5.25% due
               07/31/98 valued at $304,029) (Identified Cost
               $298,068)................................................       5.125       07/01/96                298,068
                                                                                                           ---------------
             TOTAL SHORT-TERM INVESTMENTS (IDENTIFIED COST $7,283,726)...................................        7,283,726
                                                                                                           ---------------
 
TOTAL INVESTMENTS (IDENTIFIED COST $455,837,746) (B)...................       97.8%    459,767,262
 
OTHER ASSETS IN EXCESS OF LIABILITIES..................................        2.2      10,332,426
                                                                         ----------  -------------
NET ASSETS.............................................................      100.0%  $ 470,099,688
                                                                         ----------  -------------
                                                                         ----------  -------------
<FN>
- ----------------
 *   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 WAS $10,688,979 AND THE
     AGGREGATE GROSS UNREALIZED DEPRECIATION WAS $6,759,463, RESULTING IN NET
     UNREALIZED APPRECIATION OF $3,929,516.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--HIGH YIELD
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED)
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
 PRINCIPAL
AMOUNT (IN                                                                          COUPON    MATURITY
THOUSANDS)                                                                           RATE       DATE          VALUE
- -----------                                                                        ---------  ---------  ---------------
<C>          <S>                                                                   <C>        <C>        <C>
             CORPORATE BONDS (91.8%)
             AEROSPACE (2.3%)
 $   5,400   Sabreliner Corp. (Series B).........................................    12.50  %  04/15/03  $     4,563,000
                                                                                                         ---------------
             AUTOMOTIVE (2.2%)
       800   APS, Inc. - 144A*...................................................    11.875    01/15/06          834,000
     4,750   Envirotest Systems, Inc.............................................     9.625    04/01/03        3,657,500
                                                                                                         ---------------
                                                                                                               4,491,500
                                                                                                         ---------------
             BROADCAST MEDIA (3.3%)
     2,000   Adams Outdoor Advertising - 144A*...................................    10.75     03/15/06        2,050,000
     2,000   Park Broadcasting Inc. - 144A*......................................    11.75     05/15/04        1,995,000
     2,505   Spanish Broadcasting System, Inc....................................     7.50     06/15/02        2,498,738
                                                                                                         ---------------
                                                                                                               6,543,738
                                                                                                         ---------------
             BUSINESS SERVICES (3.7%)
     2,000   Anacomp, Inc........................................................    13.00+    06/04/02        1,947,500
     5,000   Xerox Corp..........................................................    15.00     06/10/97        5,417,500
                                                                                                         ---------------
                                                                                                               7,365,000
                                                                                                         ---------------
             CABLE & TELECOMMUNICATIONS (13.7%)
     3,566   Adelphia Communications Corp. (Series B)............................     9.50+    02/15/04        3,093,577
     2,000   American Communications Services, Inc. - 144A*......................    12.75++   04/01/06        1,055,000
     5,000   AT&T Capital Corp...................................................    15.00     05/05/97        5,358,800
     2,000   Charter Communication South East L.P. - 144A*.......................    11.25     03/15/06        1,970,000
     3,019   Falcon Holdings Group L.P...........................................    11.00+    09/15/03        2,882,906
     2,000   Hyperion Communications (Units)++ - 144A*...........................    13.00++   04/15/03        1,115,000
    15,485   In-Flight Phone Corp. (Series B)....................................    14.00++   05/15/02        5,497,175
     2,000   Intermedia Communications of Florida, Inc...........................    12.50++   05/15/06        1,120,000
     1,500   Paxson Communications Corp..........................................    11.625    10/01/02        1,552,500
     2,000   Peoples Telephone Co., Inc..........................................    12.25     07/15/02        1,940,000
     2,000   Rifkin Acquisition Partners L.P.....................................    11.125    01/15/06        1,970,000
                                                                                                         ---------------
                                                                                                              27,554,958
                                                                                                         ---------------
             COMPUTER EQUIPMENT (2.3%)
     2,000   Unisys Corp.........................................................    15.00     07/01/97        2,115,000
     2,000   Unisys Corp. (Conv.)................................................     8.25     03/15/06        2,481,500
                                                                                                         ---------------
                                                                                                               4,596,500
                                                                                                         ---------------
             CONSUMER PRODUCTS (1.5%)
     3,000   J.B. Williams Holdings, Inc.........................................    12.00     03/01/04        3,030,000
                                                                                                         ---------------
             CONTAINERS (2.9%)
     6,400   Ivex Holdings Corp. (Series B)......................................    13.25++   03/15/05        3,936,000
     2,000   Mail-Well Corp......................................................    10.50     02/15/04        1,920,000
                                                                                                         ---------------
                                                                                                               5,856,000
                                                                                                         ---------------
             ELECTRICAL & ALARM SYSTEMS (2.1%)
     5,000   Mosler, Inc.........................................................    11.00     04/15/03        4,250,000
                                                                                                         ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--HIGH YIELD
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 PRINCIPAL
AMOUNT (IN                                                                          COUPON    MATURITY
THOUSANDS)                                                                           RATE       DATE          VALUE
- -----------                                                                        ---------  ---------  ---------------
<C>          <S>                                                                   <C>        <C>        <C>
             ENTERTAINMENT/GAMING & LODGING (9.5%)
 $   2,000   AMF Group Inc. - 144A*..............................................    10.875 %  03/15/06  $     1,975,000
     2,000   Fitzgeralds Gaming Corp. (Units)++..................................    13.00     12/31/02        1,680,000
     3,000   Lady Luck Gaming Finance Corp.......................................    11.875    03/01/01        2,955,000
     3,000   Motels of America, Inc. (Series B)..................................    12.00     04/15/04        2,880,000
     2,000   Players International, Inc..........................................    10.875    04/15/05        2,032,500
     3,400   Plitt Theaters, Inc. (Canada).......................................    10.875    06/15/04        3,459,500
    17,356   Spectravision, Inc. (a).............................................    11.65     12/01/02        2,016,977
     2,200   Station Casinos, Inc. (Series B)....................................     9.625    06/01/03        2,112,000
                                                                                                         ---------------
                                                                                                              19,110,977
                                                                                                         ---------------
             FOODS & BEVERAGES (10.7%)
     8,915   Envirodyne Industries, Inc..........................................    10.25     12/01/01        7,756,049
     1,500   SC International Services, Inc......................................    13.00     10/01/05        1,631,250
     5,745   Seven Up/RC Bottling Co. Southern California, Inc. (b)..............    11.50     08/01/99        3,935,225
    18,750   Specialty Foods Acquisition Corp. (Series B)........................    13.00++   08/15/05        8,250,000
                                                                                                         ---------------
                                                                                                              21,572,524
                                                                                                         ---------------
             HEALTHCARE (1.5%)
     3,210   Unilab Corp.........................................................    11.00     04/01/06        3,017,400
                                                                                                         ---------------
             MANUFACTURING (7.3%)
     4,000   Alpine Group, Inc. (Series B).......................................    12.25     07/15/03        4,030,000
     2,000   Berry Plastics Corp.................................................    12.25     04/15/04        2,150,000
     3,000   Cabot Safety Corp...................................................    12.50     07/15/05        3,307,500
     1,000   Exide Electronics Group, Inc. (Series B) - 144A*....................    11.50     03/15/06        1,020,000
     2,000   International Wire Group............................................    11.75     06/01/05        1,985,000
     2,500   Uniroyal Technology Corp............................................    11.75     06/01/03        2,250,000
                                                                                                         ---------------
                                                                                                              14,742,500
                                                                                                         ---------------
             MANUFACTURING - DIVERSIFIED (6.4%)
     2,090   Foamex L.P..........................................................    11.875    10/01/04        2,142,250
     3,000   Interlake Corp......................................................    12.125    03/01/02        3,007,500
     3,000   J.B. Poindexter & Co., Inc..........................................    12.50     05/15/04        2,557,500
     2,000   Jordan Industries, Inc..............................................    10.375    08/01/03        1,910,000
     4,500   Jordan Industries, Inc..............................................    11.75++   08/01/05        3,217,500
                                                                                                         ---------------
                                                                                                              12,834,750
                                                                                                         ---------------
             OIL & GAS (0.9%)
     2,000   Empire Gas Corp.....................................................     7.00     07/15/04        1,770,000
                                                                                                         ---------------
             PUBLISHING (4.5%)
     5,000   Affiliated Newspapers Investments, Inc..............................    13.25++   07/01/06        3,450,000
     2,000   American Media Operations, Inc......................................    11.625    11/15/04        2,020,000
     2,875   United States Banknote Corp.........................................    10.375    06/01/02        2,645,000
     1,100   United States Banknote Corp. (Series B).............................    11.625    08/01/02          913,000
                                                                                                         ---------------
                                                                                                               9,028,000
                                                                                                         ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--HIGH YIELD
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 PRINCIPAL
AMOUNT (IN                                                                          COUPON    MATURITY
THOUSANDS)                                                                           RATE       DATE          VALUE
- -----------                                                                        ---------  ---------  ---------------
<C>          <S>                                                                   <C>        <C>        <C>
             RESTAURANTS (8.7%)
 $   7,750   American Restaurant Group Holdings, Inc.............................    14.00++%  12/15/05  $     3,022,500
     3,000   Boston Chicken Inc. (Conv.).........................................     4.50     02/01/04        3,540,000
     3,000   Carrols Corp........................................................    11.50     08/15/03        3,045,000
    11,850   Flagstar Corp.......................................................    11.25     11/01/04        7,821,000
                                                                                                         ---------------
                                                                                                              17,428,500
                                                                                                         ---------------
             RETAIL (2.0%)
     2,163   Cort Furniture Rental Corp..........................................    12.00     09/01/00        2,252,224
     2,000   County Seat Stores Co...............................................    12.00     10/01/02        1,740,000
                                                                                                         ---------------
                                                                                                               3,992,224
                                                                                                         ---------------
             RETAIL - FOOD CHAINS (4.2%)
     2,000   Jitney-Jungle Stores................................................    12.00     03/01/06        2,040,000
     2,000   Pathmark Stores, Inc................................................     9.625    05/01/03        1,875,000
     2,750   Ralphs Grocery Co...................................................    10.45     06/15/04        2,626,250
     2,000   Ralphs Grocery Co...................................................    11.00     06/15/05        1,840,000
                                                                                                         ---------------
                                                                                                               8,381,250
                                                                                                         ---------------
             TEXTILES - APPAREL MANUFACTURERS (2.1%)
     5,034   JPS Textile Group, Inc..............................................    10.85     06/01/99        2,932,305
     1,500   U.S. Leather, Inc...................................................    10.25     07/31/03        1,260,000
                                                                                                         ---------------
                                                                                                               4,192,305
                                                                                                         ---------------
             TOTAL CORPORATE BONDS (IDENTIFIED COST $192,972,205)......................................      184,321,126
                                                                                                         ---------------
</TABLE>
 
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES
- -----------
<C>          <S>                                                                                       <C>
             COMMON STOCKS (C) (1.6%)
             AUTOMOTIVE (0.0%)
        87   Northern Holdings Industrial Corp. (Restricted) (d).....................................        --
                                                                                                       ---------------
             COMPUTER EQUIPMENT (0.0%)
    39,813   Memorex Telex NV (ADR) (Netherlands) (d)................................................           49,766
                                                                                                       ---------------
             ENTERTAINMENT/GAMING & LODGING (0.1%)
     2,000   Motels of America, Inc. - 144A*.........................................................          150,072
    71,890   Vagabond Inns, Inc. (Class D) (a).......................................................        --
                                                                                                       ---------------
                                                                                                               150,072
                                                                                                       ---------------
             FOODS & BEVERAGES (0.1%)
   120,000   Specialty Foods Acquisition Corp. (Restricted) - 144A*..................................          150,000
                                                                                                       ---------------
             MANUFACTURING - DIVERSIFIED (0.9%)
    84,072   Thermadyne Holdings Corp. (d)...........................................................        1,807,548
                                                                                                       ---------------
             PUBLISHING (0.1%)
     5,000   Affiliated Newspapers Investments, Inc. (Class B).......................................          150,000
                                                                                                       ---------------
             RESTAURANTS (0.0%)
     7,750   American Restaurant Group Holdings, Inc. - 144A*........................................           77,500
                                                                                                       ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--HIGH YIELD
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                                                                    VALUE
- -----------                                                                                            ---------------
<C>          <S>                                                                                       <C>
             RETAIL (0.4%)
    21,516   CORT Business Services Corp.............................................................  $       419,562
    17,100   Thrifty Payless Holdings, Inc. (Class B)................................................          294,975
                                                                                                       ---------------
                                                                                                               714,537
                                                                                                       ---------------
             TOTAL COMMON STOCKS (IDENTIFIED COST $9,922,166)........................................        3,099,423
                                                                                                       ---------------
</TABLE>
 
<TABLE>
<CAPTION>
<C>          <S>                                                                                       <C>
             PREFERRED STOCK (1.0%)
             ENTERTAINMENT/GAMING & LODGING
    80,000   Fitzgeralds Gaming Corp. (Units)++ (Identified Cost $2,000,000).........................        2,080,000
                                                                                                       ---------------
</TABLE>
 
<TABLE>
<CAPTION>
 NUMBER OF                                                                                   EXPIRATION
 WARRANTS                                                                                      DATE
- -----------                                                                                  ---------
<C>          <S>                                                                             <C>        <C>
             WARRANTS (C) (0.1%)
             AEROSPACE (0.0%)
     1,500   Sabreliner Corp. (Restricted) - 144A*.........................................   04/15/03           15,000
                                                                                                        ---------------
             CABLE & TELECOMMUNICATIONS (0.0%)
     9,485   In-Flight Phone Corp. - 144A*.................................................   08/31/02           94,850
                                                                                                        ---------------
             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        --
     3,263   Casino America, Inc...........................................................   11/15/96        --
     2,000   Fitzgeralds Gaming Corp.......................................................   12/19/98            9,043
                                                                                                        ---------------
                                                                                                                  9,043
                                                                                                        ---------------
             MANUFACTURING (0.1%)
     3,000   BPC Holdings Corp.............................................................   04/15/04          135,555
     1,000   Exide Electronics Group, Inc. - 144A*.........................................   03/15/06           30,000
    15,000   Uniroyal Technology Corp......................................................   06/01/03           26,250
                                                                                                        ---------------
                                                                                                                191,805
                                                                                                        ---------------
             OIL & GAS (0.0%)
     4,140   Empire Gas Corp...............................................................   07/15/04           41,400
                                                                                                        ---------------
             RETAIL (0.0%)
     2,000   County Seat Holdings Co.......................................................   10/15/98           20,000
                                                                                                        ---------------
             RETAIL - FOOD CHAINS (0.0%)
    15,854   Grand Union Co. (Series 1) (d)................................................   06/16/00        --
    31,709   Grand Union Co. (Series 2) (d)................................................   06/16/00        --
                                                                                                        ---------------
                                                                                                              --
                                                                                                        ---------------
             TOTAL WARRANTS (IDENTIFIED COST $812,539)................................................          372,098
                                                                                                        ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--HIGH YIELD
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
 PRINCIPAL
AMOUNT (IN                                                                            COUPON    MATURITY
THOUSANDS)                                                                             RATE       DATE          VALUE
- -----------                                                                         ----------  ---------  ---------------
<C>          <S>                                                                    <C>         <C>        <C>
             SHORT-TERM INVESTMENTS (6.2%)
             U.S. GOVERNMENT AGENCY (E) (5.7%)
 $  11,500   Federal Farm Credit Bank.............................................     5.45  %   07/01/96  $    11,500,000
                                                                                                           ---------------
             REPURCHASE AGREEMENT (0.5%)
     1,043   The Bank of New York (dated 06/28/96; proceeds $1,043,681;
               collateralized by $1,004,698 U.S. Treasury Bond 7.50% due 11/15/16
               valued at $1,064,100) (Identified Cost $1,043,235).................     5.125     07/01/96        1,043,235
                                                                                                           ---------------
             TOTAL SHORT-TERM INVESTMENTS (IDENTIFIED COST $12,543,235)..................................       12,543,235
                                                                                                           ---------------
 
TOTAL INVESTMENTS (IDENTIFIED COST $218,250,145) (F)...................      100.7%    202,415,882
 
LIABILITIES IN EXCESS OF CASH AND OTHER ASSETS.........................       (0.7)     (1,399,975)
                                                                         ----------  -------------
NET ASSETS.............................................................      100.0%  $ 201,015,907
                                                                         ----------  -------------
                                                                         ----------  -------------
<FN>
- ----------------
ADR  AMERICAN DEPOSITORY RECEIPT.
 *   RESALE IS RESTRICTED TO QUALIFIED INSTITUTIONAL INVESTORS.
++   CONSISTS OF ONE OR MORE CLASS OF SECURITIES TRADED TOGETHER AS A UNIT;
     GENERALLY BONDS WITH ATTACHED STOCKS/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 WAS $4,899,669 AND THE
     AGGREGATE GROSS UNREALIZED DEPRECIATION WAS $20,733,932, RESULTING IN NET
     UNREALIZED DEPRECIATION OF $15,834,263.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--UTILITIES
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- -----------                                        ---------------
<C>          <S>                                   <C>
             COMMON STOCKS (87.3%)
             NATURAL GAS (12.2%)
    75,000   Apache Corp.........................  $     2,465,625
   120,000   Burlington Resources, Inc...........        5,160,000
    55,000   Columbia Gas System, Inc............        2,866,875
   150,000   El Paso Natural Gas Co..............        5,775,000
   150,000   ENSERCH Corp........................        3,262,500
    85,000   Louisiana Land & Exploration
               Co. (The).........................        4,898,125
   130,000   PanEnergy Corp......................        4,273,750
   130,000   Questar Corp........................        4,420,000
   190,000   Seagull Energy Corp.*...............        4,750,000
   120,000   Tenneco, Inc........................        6,135,000
   135,000   Union Texas Petroleum Holdings,
               Inc...............................        2,632,500
    85,000   USX Delhi-Group.....................        1,041,250
   185,000   Williams Companies, Inc.............        9,157,500
                                                   ---------------
                                                        56,838,125
                                                   ---------------
             TELECOMMUNICATIONS (34.2%)
    66,666   360 Communications Co.*.............        1,599,984
   135,000   Airtouch Communications, Inc.*......        3,813,750
   230,000   Alltel Corp.........................        7,072,500
   180,000   AT&T Corp...........................       11,160,000
   160,000   BCE, Inc. (Canada)..................        6,320,000
   285,000   Cable & Wireless PLC (ADR)
               (United Kingdom)..................        5,628,750
   160,000   Century Telephone Enterprises,
               Inc...............................        5,100,000
    45,000   Cincinnati Bell, Inc................        2,345,625
   180,000   Comcast Corp. (Class A).............        3,307,500
   150,000   Comsat Corp.........................        3,900,000
   300,000   Ericsson (L.M.) Telephone Co.
               AB (ADR) (Sweden).................        6,412,500
   225,000   Frontier Corp.......................        6,890,625
   160,000   GTE Corp............................        7,160,000
    61,250   Liberty Media Group (Class A)*......        1,623,125
   180,000   MCI Communications Corp.............        4,590,000
   175,000   MFS Communications Company,
               Inc.*.............................        6,562,500
    40,000   Motorola, Inc.......................        2,515,000
   100,000   Northern Telecom, Ltd. (Canada).....        5,437,500
   140,000   NYNEX Corp..........................        6,650,000
   120,000   Pacific Telesis Group...............        4,050,000
   130,000   SBC Communications, Inc.............        6,402,500
   170,000   Southern New England
               Telecommunications Corp...........        7,140,000
   125,000   Sprint Corp.........................        5,250,000
    65,000   Tele Danmark AS (ADR)
               (Denmark).........................        1,649,375
   245,000   Tele-Communications, Inc.
               (Class A)*........................        4,410,000
    80,000   Telecom Corporation
               of New Zealand Ltd. (ADR)
               (New Zealand).....................        5,340,000
    65,000   Telefonica de Argentina S.A. (ADR)
               (Argentina).......................        1,925,625
    90,000   Telefonos de Mexico S.A. de C.V.
               (Series L) (ADR) (Mexico).........        3,015,000
   130,000   Telephone & Data Systems, Inc.......        5,850,000
    40,300   Teleport Communications Group Inc.
               (Class A)*........................          760,662
   100,000   Time Warner, Inc....................        3,925,000
   110,000   U.S. West Communications
               Group.............................        3,506,250
   150,000   U.S. West Media Group*..............        2,737,500
    90,000   WorldCom, Inc.*.....................        4,972,500
                                                   ---------------
                                                       159,023,771
                                                   ---------------
 
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- -----------                                        ---------------
<C>          <S>                                   <C>
             UTILITIES - ELECTRIC (40.9%)
   220,000   Baltimore Gas & Electric Co.........  $     6,242,500
   135,000   Carolina Power & Light Co...........        5,130,000
   150,000   Central & South West Corp...........        4,350,000
   235,865   CINergy Corp........................        7,547,680
   250,000   CMS Energy Corp.....................        7,718,750
   130,000   Consolidated Edison Co. of New York,
               Inc...............................        3,802,500
   215,000   DPL, Inc............................        5,240,625
   202,500   DQE, Inc............................        5,568,750
   165,000   DTE Energy Co.......................        5,094,375
   130,000   Edison International................        2,291,250
   140,000   Enova Corp..........................        3,237,500
   220,000   Entergy Corp........................        6,242,500
   140,000   FPL Group, Inc......................        6,440,000
   175,000   General Public Utilities Corp.......        6,168,750
   125,000   Hawaiian Electric Industries, Inc...        4,437,500
   200,000   Houston Industries, Inc.............        4,925,000
   255,000   Illinova Corp.......................        7,331,250
   225,000   IPALCO Enterprises, Inc.............        5,906,250
   145,000   Kansas City Power & Light Co........        3,987,500
    65,000   Long Island Lighting Co.............        1,088,750
   110,000   Montana Power Co....................        2,447,500
   110,000   New England Electric System.........        4,001,250
   105,000   New York State Electric & Gas
               Corp..............................        2,559,375
   175,000   NIPSCO Industries, Inc..............        7,043,750
   305,000   PacifiCorp..........................        6,786,250
   235,000   Pinnacle West Capital Corp..........        7,138,125
   100,000   Portland General Corp...............        3,087,500
    90,000   Potomac Electric Power Co...........        2,385,000
   205,000   Public Service Company of
               Colorado..........................        7,533,750
   240,000   Public Service Company of
               New Mexico........................        4,920,000
   145,000   Public Service Enterprise Group,
               Inc...............................        3,969,375
    55,000   Puget Sound Power & Light Co........        1,333,750
   180,000   SCANA Corp..........................        5,062,500
   275,000   Southern Co.........................        6,771,875
   140,000   Texas Utilities Co..................        5,985,000
   110,000   United Illuminating Co..............        4,111,250
   200,000   Western Resources, Inc..............        5,975,000
   205,000   Wisconsin Energy Corp...............        5,919,375
                                                   ---------------
                                                       189,782,055
                                                   ---------------
             TOTAL COMMON STOCKS (IDENTIFIED COST
               $330,679,925).....................      405,643,951
                                                   ---------------
</TABLE>
 
<TABLE>
<CAPTION>
 PRINCIPAL
AMOUNT (IN
THOUSANDS)
- -----------
<C>          <S>                                   <C>
             CORPORATE BONDS (8.8%)
             NATURAL GAS (2.3%)
 $   3,000   Coastal Corp. 7.75% due 10/15/35....        2,909,310
     3,000   Norsk Hydro AS 7.15% due 11/15/25
               (Norway)..........................        2,811,270
     2,000   Panhandle Eastern Corp.
               8.625% due 04/15/25...............        2,047,680
     3,000   Tenneco, Inc. 7.25% due 12/15/25....        2,809,830
                                                   ---------------
                                                        10,578,090
                                                   ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--UTILITIES
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 PRINCIPAL
AMOUNT (IN
THOUSANDS)                                              VALUE
- -----------                                        ---------------
<C>          <S>                                   <C>
             TELECOMMUNICATIONS (3.7%)
 $   3,000   Alltel Corp. 6.75% due 09/15/05.....  $     2,906,310
     2,000   BellSouth Telecommunications, Inc.
               7.625% due 05/15/35...............        1,956,660
     5,000   Century Telephone Enterprises, Inc.
               8.25% due 05/01/24................        5,025,200
     1,400   Century Telephone Enterprises, Inc.
               7.20% due 12/01/25................        1,306,242
     2,000   Southwestern Bell Telephone Co.
               7.20% due 10/15/26................        1,880,320
     2,000   Sprint Corp. 9.25% due 04/15/22.....        2,346,800
     2,000   TCI Communications, Inc.
               8.75% due 08/01/15................        1,964,900
                                                   ---------------
                                                        17,386,432
                                                   ---------------
             UTILITIES - ELECTRIC (2.8%)
     2,000   Florida Power & Light Co.
               7.05% due 12/01/26................        1,836,620
     3,000   Illinois Power Co.
               8.75% due 07/01/21................        3,076,560
     3,000   Indianapolis Power Co.
               7.05% due 02/01/24................        2,739,330
     1,500   Long Island Lighting Co.
               9.625% due 07/01/24...............        1,496,250
     2,000   South Carolina Electric & Gas Co.
               7.625% due 06/01/23...............        1,938,380
     2,000   Union Electric Co.
               8.00% due 12/15/22................        1,967,080
                                                   ---------------
                                                        13,054,220
                                                   ---------------
             TOTAL CORPORATE BONDS (IDENTIFIED
               COST $41,891,441).................       41,018,742
                                                   ---------------
</TABLE>
 
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES
- -----------
<C>          <S>                                   <C>
             PREFERRED STOCKS (0.6%)
             TELECOMMUNICATIONS (0.0%)
     7,000   GTE Delaware Corp. (Series A)
               $2.3125...........................          187,250
                                                   ---------------
             UTILITIES - ELECTRIC (0.6%)
    20,000   Alabama Power Capital Trust I
               (Series Q) $1.84..................          460,000
    40,000   Arizona Public Service Co. (Series
               A) $2.50..........................        1,085,000
</TABLE>
 
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- -----------                                        ---------------
<C>          <S>                                   <C>
     1,022   Cleveland Electric Illuminating Co.
               (Series N) $9.125.................  $       102,967
    25,600   Connecticut Light & Power Capital
               (Series A) $2.325.................          630,400
    14,000   Duquesne Capital LP
               (Series A) $2.09..................          341,250
                                                   ---------------
                                                         2,619,617
                                                   ---------------
             TOTAL PREFERRED STOCKS (IDENTIFIED
               COST $2,767,494)..................        2,806,867
                                                   ---------------
</TABLE>
 
<TABLE>
<CAPTION>
 PRINCIPAL
AMOUNT (IN
THOUSANDS)                                              VALUE
- -----------                                        ---------------
<C>          <S>                                   <C>
             U.S. GOVERNMENT AGENCY (0.3%)
 $   1,250   Tennessee Valley Authority
               8.00% due 03/31/45
               (Identified Cost $1,250,000)......        1,256,250
                                                   ---------------
 
             SHORT-TERM INVESTMENTS (2.3%)
             U.S. GOVERNMENT AGENCY (A) (2.2%)
    10,150   Federal Farm Credit Bank
               5.45% due 07/01/96................       10,150,000
                                                   ---------------
             REPURCHASE AGREEMENT (0.1%)
       449   The Bank of New York 5.125% due
               07/01/96 (dated 06/28/96; proceeds
               $449,620; collateralized by
               $456,453 U.S. Treasury Note 5.25%
               due 07/31/98 valued at $458,417)
               (Identified Cost $449,428)........          449,428
                                                   ---------------
             TOTAL SHORT-TERM INVESTMENTS
               (IDENTIFIED COST $10,599,428).....       10,599,428
                                                   ---------------
 
TOTAL INVESTMENTS (IDENTIFIED
  COST $387,188,288) (B).........       99.3%    461,325,238
 
OTHER ASSETS IN EXCESS OF
  LIABILITIES....................        0.7       3,314,811
                                   ----------  -------------
 
NET ASSETS.......................      100.0%  $ 464,640,049
                                   ----------  -------------
                                   ----------  -------------
<FN>
- ------------------
ADR  AMERICAN DEPOSITORY RECEIPT.
 *   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 WAS $85,134,013 AND THE
     AGGREGATE GROSS UNREALIZED DEPRECIATION WAS $10,997,063, RESULTING IN NET
     UNREALIZED APPRECIATION OF $74,136,950.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--DIVIDEND GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                               VALUE
- -----------                                      -----------------
<C>          <S>                                 <C>
             COMMON STOCKS (96.1%)
             AEROSPACE (3.9%)
   385,000   Raytheon Co.......................  $      19,875,625
   181,500   United Technologies Corp..........         20,872,500
                                                 -----------------
                                                        40,748,125
                                                 -----------------
             ALUMINUM (1.9%)
   347,000   Aluminum Co. of America...........         19,909,125
                                                 -----------------
             AUTO PARTS (1.8%)
   213,000   TRW, Inc..........................         19,143,375
                                                 -----------------
             AUTOMOTIVE (3.8%)
   604,000   Ford Motor Co.....................         19,554,500
   391,200   General Motors Corp...............         20,489,100
                                                 -----------------
                                                        40,043,600
                                                 -----------------
             BANKS (5.7%)
   591,000   Banc One Corp.....................         20,094,000
   268,100   BankAmerica Corp..................         20,308,575
   511,000   KeyCorp...........................         19,801,250
                                                 -----------------
                                                        60,203,825
                                                 -----------------
             BEVERAGES - SOFT DRINKS (2.0%)
   582,000   PepsiCo Inc.......................         20,588,250
                                                 -----------------
             CHEMICALS (5.6%)
   261,600   Dow Chemical Co...................         19,881,600
   323,000   Eastman Chemical Co...............         19,662,625
   270,500   Grace (W.R.) & Co.................         19,171,687
                                                 -----------------
                                                        58,715,912
                                                 -----------------
             COMPUTERS - SYSTEMS (1.9%)
   200,000   International Business Machines
               Corp............................         19,800,000
                                                 -----------------
             CONGLOMERATES (3.9%)
   296,000   Minnesota Mining & Manufacturing
               Co..............................         20,424,000
   392,600   Tenneco, Inc......................         20,071,675
                                                 -----------------
                                                        40,495,675
                                                 -----------------
             COSMETICS (2.0%)
   336,000   Gillette Co.......................         20,958,000
                                                 -----------------
             DRUGS (5.9%)
   470,000   Abbott Laboratories...............         20,445,000
   347,000   American Home Products Corp.......         20,863,375
   231,200   Bristol-Myers Squibb Co...........         20,808,000
                                                 -----------------
                                                        62,116,375
                                                 -----------------
             ELECTRIC - MAJOR (3.6%)
   236,000   General Electric Co...............         20,414,000
   930,000   Westinghouse Electric Corp........         17,437,500
                                                 -----------------
                                                        37,851,500
                                                 -----------------
             FINANCIAL - MISCELLANEOUS (2.0%)
   278,000   Household International, Inc......         21,128,000
                                                 -----------------
             FOODS (3.7%)
   561,400   Quaker Oats Company (The).........         19,157,775
   609,000   Sara Lee Corp.....................         19,716,375
                                                 -----------------
                                                        38,874,150
                                                 -----------------
             HOUSEHOLD PRODUCTS (1.9%)
   225,000   Procter & Gamble Co...............         20,390,625
                                                 -----------------
 
<CAPTION>
 NUMBER OF
  SHARES                                               VALUE
- -----------                                      -----------------
<C>          <S>                                 <C>
             INSURANCE (1.9%)
   279,500   Aetna Inc.........................  $      19,984,250
                                                 -----------------
             MANUFACTURING - DIVERSIFIED (1.9%)
   505,100   Timken Co.........................         19,572,625
                                                 -----------------
             METALS & MINING (1.9%)
   323,000   Phelps Dodge Corp.................         20,147,125
                                                 -----------------
             NATURAL GAS (6.1%)
   499,600   Burlington Resources, Inc.........         21,482,800
   553,000   El Paso Natural Gas Co............         21,290,500
   644,000   PanEnergy Corp....................         21,171,500
                                                 -----------------
                                                        63,944,800
                                                 -----------------
             OFFICE EQUIPMENT (1.9%)
   412,000   Pitney Bowes, Inc.................         19,673,000
                                                 -----------------
             OIL - DOMESTIC (3.8%)
   515,800   Ashland, Inc......................         20,438,575
   165,000   Atlantic Richfield Co.............         19,552,500
                                                 -----------------
                                                        39,991,075
                                                 -----------------
             OIL INTEGRATED - INTERNATIONAL (5.8%)
   229,000   Exxon Corp........................         19,894,375
   177,500   Mobil Corp........................         19,902,188
   134,300   Royal Dutch Petroleum Co. (ADR)
               (Netherlands)...................         20,648,625
                                                 -----------------
                                                        60,445,188
                                                 -----------------
             PAPER & FOREST PRODUCTS (3.7%)
   529,000   International Paper Co............         19,506,875
   467,100   Weyerhaeuser Co...................         19,851,750
                                                 -----------------
                                                        39,358,625
                                                 -----------------
             PHOTOGRAPHY (1.9%)
   260,000   Eastman Kodak Co..................         20,215,000
                                                 -----------------
             RAILROADS (1.9%)
   243,000   Burlington Northern Santa Fe
               Corp............................         19,652,625
                                                 -----------------
             RETAIL - DEPARTMENT STORES (1.9%)
   462,000   May Department Stores Co..........         20,212,500
                                                 -----------------
             RETAIL - FOOD CHAINS (2.0%)
   520,700   American Stores Co................         21,478,875
                                                 -----------------
             TELECOMMUNICATIONS (5.8%)
   321,800   Bell Atlantic Corp................         20,514,750
   490,000   Sprint Corp.......................         20,580,000
   621,000   U.S. West Communications
               Group...........................         19,794,375
                                                 -----------------
                                                        60,889,125
                                                 -----------------
             TOBACCO (2.0%)
   199,000   Philip Morris Companies, Inc......         20,696,000
                                                 -----------------
             UTILITIES - ELECTRIC (4.0%)
   457,500   FPL Group, Inc....................         21,045,000
   746,000   Unicom Corp.......................         20,794,750
                                                 -----------------
                                                        41,839,750
                                                 -----------------
             TOTAL COMMON STOCKS (IDENTIFIED
               COST $805,074,154)..............      1,009,067,100
                                                 -----------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--DIVIDEND GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 PRINCIPAL
AMOUNT (IN
THOUSANDS)                                             VALUE
- -----------                                      -----------------
<C>          <S>                                 <C>
             U.S. GOVERNMENT OBLIGATIONS (3.5%)
 $   2,000   U.S. Treasury Bond
               8.125% due 08/15/19.............  $       2,241,562
     5,000   U.S. Treasury Bond
               8.00% due 11/15/21..............          5,555,469
     5,000   U.S. Treasury Bond
               7.125% due 02/15/23.............          5,050,000
    14,000   U.S. Treasury Bond
               6.25% due 08/15/23..............         12,685,312
     7,000   U.S. Treasury Bond
               6.00% due 02/15/26..............          6,209,219
     5,000   U.S. Treasury Note
               6.375% due 01/15/99.............          5,014,844
                                                 -----------------
             TOTAL U.S. GOVERNMENT OBLIGATIONS
               (IDENTIFIED COST $37,077,101)...         36,756,406
                                                 -----------------
</TABLE>
 
<TABLE>
<CAPTION>
 PRINCIPAL
AMOUNT (IN
THOUSANDS)                                            VALUE
- -----------                                     -----------------
<C>          <S>                                <C>
             SHORT-TERM INVESTMENT (A) (0.4%)
             U.S. GOVERNMENT AGENCY
 $   4,350   Federal Home Loan Mortgage Corp.
             5.52% due 07/01/96 (Amortized
             Cost $4,350,000).................  $       4,350,000
                                                -----------------
 
TOTAL INVESTMENTS (IDENTIFIED
  COST $846,501,255)(B).........      100.0%    1,050,173,506
 
LIABILITIES IN EXCESS OF CASH
  AND OTHER ASSETS..............      --             (389,181)
                                  ----------  ---------------
 
NET ASSETS......................      100.0%  $ 1,049,784,325
                                  ----------  ---------------
                                  ----------  ---------------
<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 WAS $210,544,460 AND THE
     AGGREGATE GROSS UNREALIZED DEPRECIATION WAS $6,872,209, RESULTING IN NET
     UNREALIZED APPRECIATION OF $203,672,251.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--CAPITAL GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                 VALUE
- -----------                                          -------------
<C>          <S>                                     <C>
             COMMON STOCKS (91.4%)
             ADVERTISING (2.1%)
    35,500   Interpublic Group of Companies, Inc...  $   1,664,062
                                                     -------------
             APPAREL (2.1%)
    31,600   Cintas Corp...........................      1,666,900
                                                     -------------
             AUTOMOTIVE - REPLACEMENT PARTS (2.1%)
    37,300   Genuine Parts Co......................      1,706,475
                                                     -------------
             BANKING (1.5%)
    23,150   Fifth Third Bancorp...................      1,244,312
                                                     -------------
             BEVERAGES - ALCOHOLIC (1.7%)
    18,700   Anheuser-Busch Companies, Inc.........      1,402,500
                                                     -------------
             BEVERAGES - SOFT DRINKS (2.5%)
    41,400   Coca Cola Co..........................      2,023,425
                                                     -------------
             BIOTECHNOLOGY (2.3%)
    32,800   Medtronic Inc.........................      1,836,800
                                                     -------------
             BUSINESS SYSTEMS (2.0%)
    30,400   Electronic Data Systems Corp..........      1,634,000
                                                     -------------
             CHEMICALS - SPECIALTY (2.1%)
    32,200   Sigma-Aldrich Corp....................      1,706,600
                                                     -------------
             COMMERCIAL SERVICES (0.7%)
    12,000   Affiliated Computer Services, Inc.*...        564,000
                                                     -------------
             COMMUNICATIONS - EQUIPMENT & SOFTWARE (1.9%)
    27,000   Cisco Systems, Inc.*..................      1,528,875
                                                     -------------
             COMMUNICATIONS EQUIPMENT (0.7%)
     8,800   Tellabs, Inc.*........................        587,400
                                                     -------------
             COMPUTER SERVICES (2.8%)
    38,000   Automatic Data Processing, Inc........      1,467,750
    21,000   Sterling Commerce, Inc.*..............        779,625
                                                     -------------
                                                         2,247,375
                                                     -------------
             COMPUTER SOFTWARE (4.3%)
    24,000   Computer Associates International,
               Inc.................................      1,710,000
    14,600   Microsoft Corp.*......................      1,752,000
                                                     -------------
                                                         3,462,000
                                                     -------------
             COMPUTERS - SYSTEMS (1.9%)
    15,500   Hewlett-Packard Co....................      1,544,187
                                                     -------------
             CONSUMER BUSINESS SERVICES (2.3%)
    32,000   Service Corp. International...........      1,840,000
                                                     -------------
             CONSUMER SERVICES (0.3%)
     7,000   Block (H.&R.), Inc....................        228,375
                                                     -------------
             DRUGS (4.5%)
    41,000   Abbott Laboratories...................      1,783,500
    29,800   Schering-Plough Corp..................      1,869,950
                                                     -------------
                                                         3,653,450
                                                     -------------
             ELECTRICAL EQUIPMENT (0.8%)
     8,100   Grainger (W.W.), Inc..................        627,750
                                                     -------------
             ELECTRONICS (3.8%)
    46,200   Dionex Corp.*.........................      1,489,950
    32,300   Harman International Industries,
               Inc.................................      1,590,775
                                                     -------------
                                                         3,080,725
                                                     -------------
 
<CAPTION>
 NUMBER OF
  SHARES                                                 VALUE
- -----------                                          -------------
<C>          <S>                                     <C>
             ENTERTAINMENT/GAMING & LODGING (2.3%)
    45,300   Circus Circus Enterprises, Inc.*......  $   1,857,300
                                                     -------------
             FINANCIAL - MISCELLANEOUS (3.0%)
    55,500   Federal National Mortgage Assoc.......      1,859,250
     7,000   Household International, Inc..........        532,000
                                                     -------------
                                                         2,391,250
                                                     -------------
             FINANCIAL SERVICES (0.8%)
    20,000   Primark Corp.*........................        652,500
                                                     -------------
             FOOD WHOLESALERS (2.2%)
    51,900   Sysco Corp............................      1,777,575
                                                     -------------
             FOODS (3.5%)
    43,200   ConAgra, Inc..........................      1,960,200
    17,800   Wrigley (Wm.) Jr. Co. (Class A).......        898,900
                                                     -------------
                                                         2,859,100
                                                     -------------
             GOLD MINING (1.8%)
    53,700   Barrick Gold Corp. (Canada)...........      1,456,613
                                                     -------------
             HOTELS/MOTELS (3.8%)
    22,000   HFS, Inc.*............................      1,540,000
    45,000   La Quinta Inns, Inc...................      1,507,500
                                                     -------------
                                                         3,047,500
                                                     -------------
             HOUSEHOLD FURNISHINGS & APPLIANCES (1.0%)
    32,500   Heilig-Meyers Co......................        780,000
                                                     -------------
             INSURANCE (2.2%)
    18,250   American International Group, Inc.....      1,799,906
                                                     -------------
             MACHINERY - DIVERSIFIED (2.1%)
    41,400   Thermo Electron Corp.*................      1,723,275
                                                     -------------
             MANUFACTURED HOUSING (2.3%)
    94,000   Clayton Homes, Inc....................      1,880,000
                                                     -------------
             MANUFACTURING (1.8%)
    63,301   Federal Signal Corp...................      1,487,574
                                                     -------------
             MANUFACTURING - DIVERSIFIED (2.1%)
    36,500   Sherwin-Williams Co...................      1,697,250
                                                     -------------
             MEDIA GROUP (1.8%)
    18,000   Clear Channel Communications,
               Inc.*...............................      1,482,750
                                                     -------------
             MEDICAL EQUIPMENT (1.0%)
     5,900   Biomet, Inc.*.........................         83,338
    33,400   Stryker Corp..........................        755,675
                                                     -------------
                                                           839,013
                                                     -------------
             OFFICE EQUIPMENT & SUPPLIES (1.1%)
    46,000   Staples, Inc.*........................        891,250
                                                     -------------
             PHARMACEUTICALS (2.2%)
    35,800   Johnson & Johnson.....................      1,772,100
                                                     -------------
             RESTAURANTS (2.1%)
    84,100   Brinker International, Inc.*..........      1,261,500
    21,000   International Dairy Queen, Inc. (Class
               A)*.................................        446,250
                                                     -------------
                                                         1,707,750
                                                     -------------
             RETAIL - DEPARTMENT STORES (2.3%)
    72,000   Wal-Mart Stores, Inc..................      1,827,000
                                                     -------------
             RETAIL - DRUG STORES (2.2%)
    52,500   Walgreen Co...........................      1,758,750
                                                     -------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--CAPITAL GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                 VALUE
- -----------                                          -------------
<C>          <S>                                     <C>
             RETAIL - FOOD CHAINS (2.2%)
    43,900   Albertson's Inc.......................  $   1,816,363
                                                     -------------
             RETAIL - SPECIALTY (2.4%)
    35,600   Home Depot, Inc.......................      1,922,400
                                                     -------------
             TELECOMMUNICATION EQUIPMENT (0.6%)
     5,600   U.S. Robotics Corp.*..................        477,400
                                                     -------------
             UTILITIES (2.2%)
    75,233   Citizens Utilities Co. (Series A)*....        865,177
    76,162   Citizens Utilities Co. (Series B)*....        885,388
                                                     -------------
                                                         1,750,565
                                                     -------------
             TOTAL COMMON STOCKS (IDENTIFIED COST
               $59,020,114)........................     73,904,395
                                                     -------------
</TABLE>
<TABLE>
<CAPTION>
 PRINCIPAL
AMOUNT (IN
THOUSANDS)
- -----------
<C>          <S>                                    <C>
             SHORT-TERM INVESTMENTS (7.9%)
             U.S. GOVERNMENT AGENCIES (A) (7.4%)
 $   2,000   Federal Farm Credit Bank
               5.45% due 07/01/96.................      2,000,000
     4,000   Federal Home Loan Mortgage Corp.
               5.27% due 07/03/96.................      3,998,829
                                                    -------------
             TOTAL U.S. GOVERNMENT AGENCIES
               (AMORTIZED COST $5,998,829)........      5,998,829
                                                    -------------
 
<CAPTION>
 PRINCIPAL
AMOUNT (IN
THOUSANDS)                                              VALUE
- -----------                                         -------------
<C>          <S>                                    <C>
             REPURCHASE AGREEMENT (0.5%)
 $     378   The Bank of New York 5.125% due
               07/01/96 (dated 06/28/96; proceeds
               $378,569; collateralized by
               $384,322 U.S. Treasury Bill 5.25%
               due 07/31/98 valued at $385,975)
               (Identified Cost $378,407).........  $     378,407
                                                    -------------
             TOTAL SHORT-TERM INVESTMENTS
               (IDENTIFIED COST $6,377,236).......      6,377,236
                                                    -------------
 
TOTAL INVESTMENTS (IDENTIFIED COST
  $65,397,350) (B)................       99.3%    80,281,631
 
OTHER ASSETS IN EXCESS OF
  LIABILITIES.....................        0.7        533,393
                                    ----------  ------------
 
NET ASSETS........................      100.0%  $ 80,815,024
                                    ----------  ------------
                                    ----------  ------------
<FN>
- ------------------
 *   NON-INCOME PRODUCING SECURITY.
(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 WAS $15,668,129 AND THE
     AGGREGATE GROSS UNREALIZED DEPRECIATION WAS $783,848, RESULTING IN NET
     UNREALIZED APPRECIATION OF $14,884,281.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--GLOBAL DIVIDEND GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 NUMBER OF
   SHARES                                               VALUE
- ------------                                       ---------------
<C>           <S>                                  <C>
              COMMON AND PREFERRED STOCKS (99.6%)
              AUSTRALIA (1.5%)
              BUILDING & CONSTRUCTION
     463,000  Pioneer International Ltd..........  $     1,348,553
                                                   ---------------
              MULTI-INDUSTRY
     546,000  Southcorp Holdings Ltd.............        1,353,905
                                                   ---------------
              PAPER & FOREST PRODUCTS
     200,000  Amcor Ltd..........................        1,361,856
                                                   ---------------
              TOTAL AUSTRALIA....................        4,064,314
                                                   ---------------
 
              CANADA (3.0%)
              BANKS - COMMERCIAL
     101,400  Toronto Dominion Bank..............        1,780,970
                                                   ---------------
              NATURAL GAS
     106,000  TransCanada Pipelines Ltd..........        1,574,142
                                                   ---------------
              OIL RELATED
      38,300  Imperial Oil Ltd...................        1,617,835
      63,400  IPL Energy, Inc....................        1,594,764
                                                   ---------------
                                                         3,212,599
                                                   ---------------
              TELECOMMUNICATIONS
      42,000  BCE, Inc...........................        1,655,544
                                                   ---------------
              TOTAL CANADA.......................        8,223,255
                                                   ---------------
              FRANCE (7.5%)
              BANKING
      15,750  Societe Generale...................        1,730,299
                                                   ---------------
              BUILDING & CONSTRUCTION
      26,600  Lafarge S.A........................        1,608,288
                                                   ---------------
              FINANCIAL SERVICES
       4,500  Societe Eurafrance S.A.............        1,738,160
                                                   ---------------
              FOODS & BEVERAGES
      10,850  Eridania Beghin-Say S.A............        1,697,418
                                                   ---------------
              HOUSEHOLD PRODUCTS
      12,200  BIC S.A............................        1,731,017
                                                   ---------------
              MULTI-INDUSTRY
       7,500  Compagnie Generale d'Industrie et
                de Participations................        1,723,603
       6,500  Saint-Louis........................        1,724,670
      33,861  Worms et Compagnie.................        1,761,403
                                                   ---------------
                                                         5,209,676
                                                   ---------------
              OIL INTEGRATED - INTERNATIONAL
      23,900  Societe National Elf Aquitaine.....        1,756,316
      23,300  Total S.A. (B Shares)..............        1,726,696
                                                   ---------------
                                                         3,483,012
                                                   ---------------
              TELECOMMUNICATIONS
      19,700  Alcatel Alsthom....................        1,716,867
                                                   ---------------
              TELEVISION
      14,603  Societe Television Francaise 1.....        1,666,647
                                                   ---------------
              TOTAL FRANCE.......................       20,581,384
                                                   ---------------
 
<CAPTION>
 NUMBER OF
   SHARES                                               VALUE
- ------------                                       ---------------
<C>           <S>                                  <C>
              GERMANY (6.6%)
              BANKING
      25,700  Deutsche Bank
                Aktiengesellschaft...............  $     1,214,253
                                                   ---------------
              BUILDING & CONSTRUCTION
       3,350  Bilfinger & Berger Bau AG..........        1,411,313
                                                   ---------------
              CHEMICALS
       4,900  BASF AG............................        1,398,714
      40,000  Bayer AG...........................        1,410,854
                                                   ---------------
                                                         2,809,568
                                                   ---------------
              HEALTH & PERSONAL CARE
      36,000  Douglas Holding AG.................        1,412,691
                                                   ---------------
              MACHINERY - DIVERSIFIED
       4,250  IWKA AG............................          872,925
       2,500  M.A.N. AG..........................          621,432
                                                   ---------------
                                                         1,494,357
                                                   ---------------
              MULTI-INDUSTRY
       5,600  Preussag AG........................        1,414,791
      35,400  RWE AG.............................        1,377,531
       3,400  Viag AG............................        1,354,288
                                                   ---------------
                                                         4,146,610
                                                   ---------------
              RETAIL - DEPARTMENT STORES
       3,400  Karstadt AG........................        1,373,253
                                                   ---------------
              STEEL & IRON
       7,400  Thyssen AG.........................        1,350,443
                                                   ---------------
              TEXTILES - APPAREL
       1,150  Hugo Boss AG (Pref.)...............        1,320,625
                                                   ---------------
              UTILITIES - ELECTRIC
      25,200  Veba AG............................        1,337,308
                                                   ---------------
              TOTAL GERMANY......................       17,870,421
                                                   ---------------
 
              HONG KONG (4.0%)
              BANKING
     146,200  HSBC Holdings PLC..................        2,209,943
                                                   ---------------
              CONGLOMERATES
     259,500  Swire Pacific Ltd. (Class A).......        2,221,115
                                                   ---------------
              REAL ESTATE
     297,000  Cheung Kong (Holdings) Ltd.........        2,139,189
                                                   ---------------
              TELECOMMUNICATIONS
   1,252,400  Hong Kong
                Telecommunications Ltd...........        2,249,084
                                                   ---------------
              UTILITIES - ELECTRIC
     707,000  Hong Kong Electric Holdings Ltd....        2,155,655
                                                   ---------------
              TOTAL HONG KONG....................       10,974,986
                                                   ---------------
 
              ITALY (4.0%)
              FINANCIAL SERVICES
     219,000  Istituto Mobiliare Italiano SpA....        1,827,379
                                                   ---------------
              NATURAL GAS
     492,000  Italgas SpA........................        1,836,180
                                                   ---------------
              OIL & GAS PRODUCTS
     372,000  Ente Nazionale Idrocarburi SpA.....        1,853,938
                                                   ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--GLOBAL DIVIDEND GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 NUMBER OF
   SHARES                                               VALUE
- ------------                                       ---------------
<C>           <S>                                  <C>
              TELECOMMUNICATIONS
     275,000  Sirti SpA..........................  $     1,765,808
   1,070,000  Telecom Italia SpA.................        1,844,948
                                                   ---------------
                                                         3,610,756
                                                   ---------------
              TEXTILES - APPAREL
     135,200  Benetton Group SpA.................        1,745,085
                                                   ---------------
              TOTAL ITALY........................       10,873,338
                                                   ---------------
 
              JAPAN (25.7%)
              AUTOMOTIVE
     115,000  Honda Motor Co.....................        2,977,482
     122,000  Toyota Motor Corp..................        3,047,497
                                                   ---------------
                                                         6,024,979
                                                   ---------------
              BREWERS
     244,000  Kirin Brewery Co., Ltd.............        2,980,764
                                                   ---------------
              BUILDING & CONSTRUCTION
     263,000  Sekisui House Ltd..................        2,997,083
                                                   ---------------
              COMPUTER SERVICES
     308,000  NCR Japan Ltd......................        3,060,625
                                                   ---------------
              ELECTRONICS & ELECTRICAL
     326,000  Hitachi, Ltd.......................        3,031,452
      43,000  Kyocera Corp.......................        3,038,107
     166,000  Matsushita Electric Industrial
                Co. Ltd..........................        3,087,246
     278,000  Matsushita Electric Works..........        3,015,954
     442,000  Mitsubishi Electric Corp...........        3,078,567
     286,000  NEC Corp...........................        3,102,744
     179,000  Sharp Corp.........................        3,133,194
      47,000  Sony Corp..........................        3,089,343
      51,000  TDK Corp...........................        3,040,751
                                                   ---------------
                                                        27,617,358
                                                   ---------------
              ENTERTAINMENT & LEISURE TIME
     322,000  Mizuno Corp........................        3,023,612
      41,100  Nintendo Corp., Ltd................        3,057,489
                                                   ---------------
                                                         6,081,101
                                                   ---------------
              FOODS & BEVERAGES
     165,000  House Food Industry................        3,128,818
     431,000  Snow Brand Milk Products...........        2,927,295
                                                   ---------------
                                                         6,056,113
                                                   ---------------
              MACHINERY - DIVERSIFIED
     586,000  Furukawa Co., Ltd..................        3,071,839
     353,000  Mitsubishi Heavy Industries, Ltd...        3,066,907
                                                   ---------------
                                                         6,138,746
                                                   ---------------
              PHARMACEUTICALS
     142,000  Taisho Pharmaceutical Co., Ltd.....        3,068,101
     172,000  Takeda Chemical Industries.........        3,042,027
                                                   ---------------
                                                         6,110,128
                                                   ---------------
              TRANSPORTATION
     254,000  Yamato Transport Co. Ltd...........        2,987,146
                                                   ---------------
              TOTAL JAPAN........................       70,054,043
                                                   ---------------
 
              MALAYSIA (2.0%)
              BANKING
      68,000  AMMB Holdings Berhad...............          954,290
                                                   ---------------
<CAPTION>
 NUMBER OF
   SHARES                                               VALUE
- ------------                                       ---------------
<C>           <S>                                  <C>
              BUILDING & CONSTRUCTION
     274,000  Cement Industries of Malaysia......  $       922,855
     130,000  United Engineers Malaysia
                Berhad...........................          901,764
                                                   ---------------
                                                         1,824,619
                                                   ---------------
              CONGLOMERATES
     331,000  Sime Darby Berhad..................          915,758
                                                   ---------------
              FOODS & BEVERAGES
     114,000  Nestle Malaysia Berhad.............          918,765
                                                   ---------------
              OIL RELATED
     275,000  Esso Malaysia Berhad...............          771,853
                                                   ---------------
              TOTAL MALAYSIA.....................        5,385,285
                                                   ---------------
 
              NETHERLANDS (3.0%)
              APPLIANCES & HOUSEHOLD DURABLES
      27,900  Philips Electronics NV.............          906,215
                                                   ---------------
              BANKING
      16,700  ABN-AMRO Holding NV................          895,254
                                                   ---------------
              BUILDING & CONSTRUCTION
      11,700  Koninklijke Volker Stevin NV.......          908,638
                                                   ---------------
              CHEMICALS
       9,200  DSM NV.............................          912,624
                                                   ---------------
              FINANCIAL SERVICES
      30,600  ING Groep NV.......................          911,535
                                                   ---------------
              INSURANCE
      31,250  Fortis Amev NV.....................          894,320
                                                   ---------------
              OIL
       5,800  Royal Dutch Petroleum Co...........          894,762
                                                   ---------------
              TELECOMMUNICATIONS
      25,000  Koninklijke PTT Nederland NV.......          945,163
                                                   ---------------
              TEXTILES
      18,900  Gamma Holding NV...................          873,822
                                                   ---------------
              TOTAL NETHERLANDS..................        8,142,333
                                                   ---------------
 
              SWITZERLAND (2.0%)
              BANKING
       9,400  Schweizerischer Bankverein.........        1,852,993
                                                   ---------------
              CHEMICALS
       1,525  Ciba-Geigy AG......................        1,847,526
                                                   ---------------
              FOODS & BEVERAGES
       1,575  Nestle AG..........................        1,796,229
                                                   ---------------
              TOTAL SWITZERLAND..................        5,496,748
                                                   ---------------
 
              UNITED KINGDOM (9.9%)
              BANKING
     488,000  Hambros PLC........................        1,757,112
     351,960  Lloyds TSB Group PLC...............        1,720,662
     177,000  National Westminster Bank
                PLC..............................        1,686,683
                                                   ---------------
                                                         5,164,457
                                                   ---------------
              BREWERS
     132,500  Bass PLC...........................        1,659,515
     163,000  Scottish & Newcastle Breweries
                PLC..............................        1,669,642
                                                   ---------------
                                                         3,329,157
                                                   ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--GLOBAL DIVIDEND GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 NUMBER OF
   SHARES                                               VALUE
- ------------                                       ---------------
<C>           <S>                                  <C>
              FOODS & BEVERAGES
   1,053,000  Hazlewood Foods PLC................  $     1,601,571
     593,000  Hillsdown Holdings PLC.............        1,595,955
                                                   ---------------
                                                         3,197,526
                                                   ---------------
              MULTI-INDUSTRY
     634,000  Hanson PLC.........................        1,771,142
                                                   ---------------
              NATURAL GAS
     600,000  British Gas PLC....................        1,666,848
                                                   ---------------
              RETAIL - MERCHANDISING
     363,000  Tesco PLC..........................        1,661,959
                                                   ---------------
              STEEL & IRON
     670,000  British Steel PLC..................        1,700,138
                                                   ---------------
              TELECOMMUNICATIONS
     315,000  British Telecommunications PLC.....        1,691,525
                                                   ---------------
              TOBACCO
     222,000  B.A.T. Industries PLC..............        1,726,165
                                                   ---------------
              UTILITIES - ELECTRIC
     363,000  Scottish Hydro-Electric PLC........        1,667,593
                                                   ---------------
              UTILITIES - WATER
     155,000  Hyder PLC..........................        1,707,976
     121,500  Hyder PLC (Pref.)..................          183,382
     191,000  Severn Trent PLC...................        1,612,590
                                                   ---------------
                                                         3,503,948
                                                   ---------------
              TOTAL UNITED KINGDOM...............       27,080,458
                                                   ---------------
              UNITED STATES (30.4%)
              AEROSPACE & DEFENSE
      61,700  Northrop Grumman Corp..............        4,203,312
                                                   ---------------
              AUTOMOTIVE
     128,500  Ford Motor Co......................        4,160,187
                                                   ---------------
              BANKS
      55,700  BankAmerica Corp...................        4,219,275
     108,800  KeyCorp............................        4,216,000
                                                   ---------------
                                                         8,435,275
                                                   ---------------
              CHEMICALS
     129,800  Monsanto Co........................        4,218,500
                                                   ---------------
              COMPUTERS - SYSTEMS
      41,900  International Business Machines
                Corp.............................        4,148,100
                                                   ---------------
<CAPTION>
 NUMBER OF
   SHARES                                               VALUE
- ------------                                       ---------------
<C>           <S>                                  <C>
              CONGLOMERATES
      60,100  Minnesota Mining & Manufacturing
                Co...............................  $     4,146,900
      82,900  Tenneco, Inc.......................        4,238,262
                                                   ---------------
                                                         8,385,162
                                                   ---------------
              MACHINERY - DIVERSIFIED
     105,400  Deere & Co.........................        4,216,000
                                                   ---------------
              METALS & MINING
      67,600  Phelps Dodge Corp..................        4,216,550
                                                   ---------------
              OIL - DOMESTIC
     104,900  Ashland, Inc.......................        4,156,663
                                                   ---------------
              OIL INTEGRATED - INTERNATIONAL
      69,800  Chevron Corp.......................        4,118,200
                                                   ---------------
              PAPER & FOREST PRODUCTS
     111,400  International Paper Co.............        4,107,875
                                                   ---------------
              PHARMACEUTICALS
      46,400  Bristol-Myers Squibb Co............        4,176,000
                                                   ---------------
              RAILROADS
      61,500  Conrail, Inc.......................        4,082,063
                                                   ---------------
              RETAIL
      41,000  Dayton-Hudson Corp.................        4,228,125
                                                   ---------------
              TELECOMMUNICATIONS
     102,200  Sprint Corp........................        4,292,400
                                                   ---------------
              TIRE & RUBBER GOODS
      86,500  Goodyear Tire & Rubber Co..........        4,173,625
                                                   ---------------
              TOBACCO
      39,800  Philip Morris Companies, Inc.......        4,139,200
                                                   ---------------
              UTILITIES - ELECTRIC
     145,000  Pacific Gas & Electric Co..........        3,371,250
                                                   ---------------
              TOTAL UNITED STATES................       82,828,487
                                                   ---------------
 
TOTAL COMMON AND PREFERRED STOCKS
  (IDENTIFIED COST $242,632,323)
  (A)............................       99.6%    271,575,052
 
CASH AND OTHER ASSETS IN EXCESS
  OF LIABILITIES.................        0.4       1,002,875
                                   ----------  -------------
 
NET ASSETS.......................      100.0%  $ 272,577,927
                                   ----------  -------------
                                   ----------  -------------
<FN>
- ------------------
(A)  THE AGGREGATE COST FOR FEDERAL INCOME TAX PURPOSES APPROXIMATES IDENTIFIED
     COST.  THE AGGREGATE GROSS UNREALIZED APPRECIATION WAS $33,279,819 AND THE
     AGGREGATE GROSS UNREALIZED DEPRECIATION  WAS $4,337,090, RESULTING IN  NET
     UNREALIZED APPRECIATION OF $28,942,729.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--GLOBAL DIVIDEND GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
 
FORWARD FOREIGN CURRENCY CONTRACTS OPEN AT JUNE 30, 1996:
 
<TABLE>
<CAPTION>
                                                UNREALIZED
  CONTRACTS TO      IN EXCHANGE     DELIVERY   APPRECIATION
    RECEIVE             FOR           DATE    (DEPRECIATION)
- ----------------  ----------------  --------  ---------------
<S>  <C>          <C>    <C>        <C>       <C>
$        210,466  DEM      322,770  07/01/96  $       (1,340)
DEM      388,270  $        255,256  07/01/96            (469)
Y     20,975,864  $        192,087  07/01/96            (858)
$         59,833  CHF       75,485  07/02/96            (411)
$         39,388  CHF       49,377  07/02/96             (19)
$         73,911  Y      8,116,937  07/02/96             (87)
L         49,446  $         76,211  07/02/96             529
Y     21,226,835  $        193,288  07/02/96             229
$         31,535  DEM       48,071  07/03/96             (10)
L         50,401  $         78,147  07/03/96              76
L        187,330  $        289,744  07/03/96             993
Y     13,097,828  $        119,310  07/03/96              98
$        164,896  DEM      251,368  07/05/96             (54)
$         52,917  DEM       80,693  07/05/96             (35)
$         21,968  FRF      113,245  07/31/96             (13)
FRF      299,045  $         57,695  07/31/96             349
                                                     -------
                  Net unrealized depreciation........$(1,022)
                                                     -------
                                                     -------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--GLOBAL DIVIDEND GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                             PERCENT OF
INDUSTRY                        VALUE        NET ASSETS
- --------------------------  --------------  -------------
<S>                         <C>             <C>
Aerospace & Defense.......  $    4,203,312          1.6%
Appliances & Household
  Durables................         906,215          0.3
Automotive................      10,185,166          3.7
Banking...................      14,021,489          5.2
Banks.....................       8,435,275          3.1
Banks - Commercial........       1,780,970          0.7
Brewers...................       6,309,921          2.3
Building & Construction...      10,098,494          3.7
Chemicals.................       9,788,218          3.6
Computer Services.........       3,060,625          1.1
Computers - Systems.......       4,148,100          1.5
Conglomerates.............      11,522,035          4.2
Electronics & Electrical..      27,617,358         10.1
Entertainment & Leisure
  Time....................       6,081,101          2.2
Financial Services........       4,477,074          1.7
Foods & Beverages.........      13,666,051          5.0
Health & Personal Care....       1,412,691          0.5
Household Products........       1,731,017          0.6
Insurance.................         894,320          0.3
Machinery - Diversified...      11,849,103          4.4
Metals & Mining...........       4,216,550          1.5
Multi-Industry............      12,481,333          4.6
Natural Gas...............       5,077,170          1.9
 
<CAPTION>
                                             PERCENT OF
INDUSTRY                        VALUE        NET ASSETS
- --------------------------  --------------  -------------
<S>                         <C>             <C>
 
Oil.......................  $      894,762          0.3%
Oil & Gas Products........       1,853,938          0.7
Oil - Domestic............       4,156,663          1.5
Oil Integrated -
  International...........       7,601,212          2.8
Oil Related...............       3,984,452          1.5
Paper & Forest Products...       5,469,731          2.0
Pharmaceuticals...........      10,286,128          3.8
Railroads.................       4,082,063          1.5
Real Estate...............       2,139,189          0.8
Retail....................       4,228,125          1.6
Retail - Department
  Stores..................       1,373,253          0.5
Retail - Merchandising....       1,661,959          0.6
Steel & Iron..............       3,050,581          1.1
Telecommunications........      16,161,339          5.9
Television................       1,666,647          0.6
Textiles..................         873,822          0.3
Textiles - Apparel........       3,065,710          1.1
Tire & Rubber Goods.......       4,173,625          1.5
Tobacco...................       5,865,365          2.2
Transportation............       2,987,146          1.1
Utilities - Electric......       8,531,806          3.1
Utilities - Water.........       3,503,948          1.3
                            --------------        -----
                            $  271,575,052         99.6%
                            --------------        -----
                            --------------        -----
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                         PERCENT OF
TYPE OF INVESTMENT                                                                          VALUE        NET ASSETS
- --------------------------------------------------------------------------------------  --------------  -------------
<S>                                                                                     <C>             <C>
Common Stocks.........................................................................  $  270,071,045         99.1%
Preferred Stocks......................................................................       1,504,007          0.5
                                                                                        --------------        -----
                                                                                        $  271,575,052         99.6%
                                                                                        --------------        -----
                                                                                        --------------        -----
</TABLE>
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--EUROPEAN GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                              VALUE
- ---------------                                    ---------------
<C>              <S>                               <C>
                 COMMON AND PREFERRED STOCKS, BONDS, WARRANTS AND
                   RIGHTS (95.8%)
                 AUSTRIA (1.2%)
                 OIL & GAS PRODUCTS
        12,000   OMV AG..........................  $     1,214,099
                                                   ---------------
                 TRANSPORTATION
        22,000   Flughafen Wien AG...............        1,508,859
                                                   ---------------
                 TOTAL AUSTRIA...................        2,722,958
                                                   ---------------
                 BELGIUM (1.1%)
                 RETAIL
        59,927   G.I.B. Holdings Ltd.............        2,687,464
                                                   ---------------
                 DENMARK (1.5%)
                 AIR TRANSPORT
        14,700   Kobenhavns Lufthavne AS.........        1,452,223
                                                   ---------------
                 PHARMACEUTICALS
        14,000   Novo-Nordisk AS (Series B)......        1,979,220
                                                   ---------------
                 TOTAL DENMARK...................        3,431,443
                                                   ---------------
                 FINLAND (0.6%)
                 ELECTRONICS
        36,600   Nokia AB (Series A).............        1,349,331
                                                   ---------------
                 FRANCE (14.0%)
                 BUILDING MATERIALS
        15,530   IMETAL..........................        2,200,485
                                                   ---------------
                 ELECTRICAL EQUIPMENT
         4,000   Legrand S.A. (Pref.)............          469,721
                                                   ---------------
                 ELECTRONICS
        63,650   SGS-Thomson Microelectronics
                   NV*...........................        2,236,151
                                                   ---------------
                 FINANCIAL SERVICES
        10,200   Cetelem Groupe..................        2,290,644
                                                   ---------------
                 FOOD, BEVERAGE, TOBACCO & HOUSEHOLD PRODUCTS
         8,000   BIC S.A.........................        1,135,093
        13,535   LVMH Moet-Hennessy Louis
                   Vuitton.......................        3,207,732
        78,000   SEITA...........................        3,572,981
                                                   ---------------
                                                         7,915,806
                                                   ---------------
                 INSURANCE
        48,565   Scor S.A........................        1,890,001
                                                   ---------------
                 PHARMACEUTICALS
        39,587   Sanofi S.A......................        2,964,415
     FRF     2K  Sanofi S.A. 4.00% due 01/01/00
                   (Conv. Pref.).................          186,353
                                                   ---------------
                                                         3,150,768
                                                   ---------------
                 RETAIL
         7,326   Carrefour Supermarche*..........        4,100,967
        12,377   Castorama Dubois
                   Investissement................        2,436,001
      FRF  495   Castorama Dubois Investissement
                   3.15% due 01/01/03 (Conv.
                   Pref.)........................          115,295
                                                   ---------------
                                                         6,652,263
                                                   ---------------
 
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                              VALUE
- ---------------                                    ---------------
<C>              <S>                               <C>
                 STEEL & IRON
       125,000   Usinor Sacilor..................  $     1,801,485
                                                   ---------------
                 TEXTILES
        19,500   Christian Dior S.A..............        2,535,908
         3,500   Christian Dior S.A.
                   (Warrants due 06/30/98)*......           73,370
         6,454   Hermes International............        1,703,696
                                                   ---------------
                                                         4,312,974
                                                   ---------------
                 TOTAL FRANCE....................       32,920,298
                                                   ---------------
 
                 GERMANY (8.6%)
                 AUTOMOTIVE
         3,900   BMW AG..........................        2,258,514
         6,890   Volkswagen AG...................        2,556,792
                                                   ---------------
                                                         4,815,306
                                                   ---------------
                 CHEMICALS
         8,200   BASF AG.........................        2,340,705
        98,650   Bayer AG........................        3,479,518
        20,000   SGL Carbon AG...................        2,336,111
                                                   ---------------
                                                         8,156,334
                                                   ---------------
                 HEALTH & PERSONAL CARE
         5,220   Rhoen-Klinikum AG...............          671,383
        12,780   Rhoen-Klinikum AG (Pref.).......        1,467,616
                                                   ---------------
                                                         2,138,999
                                                   ---------------
                 MANUFACTURING
        28,700   Adidas AG.......................        2,408,773
                                                   ---------------
                 MERCHANDISING
         3,850   Gehe AG.........................        2,652,733
                                                   ---------------
                 TOTAL GERMANY...................       20,172,145
                                                   ---------------
 
                 ITALY (4.2%)
                 FOOD MANUFACTURER
     1,091,000   Parmalat Finanzeria SpA.........        1,465,098
                                                   ---------------
                 HOUSEHOLD FURNISHINGS & APPLIANCES
        29,700   Industrie Natuzzi SpA (ADR).....        1,522,125
                                                   ---------------
                 OIL & GAS PRODUCTS
       653,700   Ente Nazionale Idrocarburi
                   SpA...........................        3,257,846
                                                   ---------------
                 TELECOMMUNICATIONS
     1,599,750   Telecom Italia Mobile SpA.......        3,571,802
                                                   ---------------
                 TOTAL ITALY.....................        9,816,871
                                                   ---------------
 
                 NETHERLANDS (13.2%)
                 BANKING
        51,700   ABN-AMRO Holding NV.............        2,771,534
                                                   ---------------
                 FOOD DISTRIBUTION
        51,194   Koninklijke Ahold NV............        2,771,373
                                                   ---------------
                 FOOD PROCESSING
        20,696   Nutricia Vereenigde Bedrijven
                   NV............................        2,186,240
                                                   ---------------
                 INSURANCE
        59,008   Aegon NV........................        2,714,361
        87,280   ING Groep NV....................        2,599,960
                                                   ---------------
                                                         5,314,321
                                                   ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--EUROPEAN GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                              VALUE
- ---------------                                    ---------------
<C>              <S>                               <C>
                 MANUFACTURING
        37,550   ASM Lithography Holding
                   NV*...........................  $     1,549,292
                                                   ---------------
                 MERCHANDISING
        20,000   Gucci Group NV..................        1,294,551
                                                   ---------------
                 MULTI-INDUSTRY
        55,365   Hunter Douglas NV...............        3,774,813
                                                   ---------------
                 PUBLISHING
       241,000   Elsevier NV.....................        3,653,011
       157,000   Ver Ned Uitgev Ver Bezit NV.....        2,434,892
        20,335   Wegener NV......................        2,152,866
        26,232   Wolters Kluwer NV...............        2,976,757
                                                   ---------------
                                                        11,217,526
                                                   ---------------
                 TOTAL NETHERLANDS...............       30,879,650
                                                   ---------------
                 NORWAY (0.4%)
                 INSURANCE
       225,000   UNI Storebrand AS*..............        1,010,412
                                                   ---------------
                 SPAIN (6.1%)
                 BANKS
        71,686   Banco Bilbao Vizcaya............        2,902,109
        12,946   Banco Popular Espanol S.A.......        2,306,448
                                                   ---------------
                                                         5,208,557
                                                   ---------------
                 FINANCIAL SERVICES
        28,160   Corporacion Financiera Alba.....        2,341,541
                                                   ---------------
                 OIL RELATED
        20,116   Gas Natural SDG S.A.
                   (Series E)....................        4,220,908
                                                   ---------------
                 UTILITIES
       239,750   Iberdrola S.A...................        2,459,214
                                                   ---------------
                 TOTAL SPAIN.....................       14,230,220
                                                   ---------------
                 SWEDEN (9.3%)
                 BUSINESS SERVICES
       100,000   Assa Abloy AB (Series B)........        1,444,956
       183,000   Securitas AB
                   (Series "B" Free).............        3,828,682
                                                   ---------------
                                                         5,273,638
                                                   ---------------
                 HEALTH & PERSONAL CARE
       131,868   Getinge Industrier AB
                   (B Shares)....................        2,481,035
                                                   ---------------
                 INSURANCE
       122,381   Scandia Forsakrings AB..........        3,232,768
                                                   ---------------
                 MACHINERY
       100,000   Kalmar Industries AB............        2,107,228
                                                   ---------------
                 PHARMACEUTICALS
        45,525   Astra AB (Series "A" Free)......        2,007,710
                                                   ---------------
                 RETAIL
        40,160   Hennes & Mauritz AB
                   (B Shares)....................        3,717,511
                                                   ---------------
                 TELECOMMUNICATION EQUIPMENT
       133,400   Ericsson (L.M.) Telephone Co. AB
                   (Series "B" Free).............        2,871,279
                                                   ---------------
                 TOTAL SWEDEN....................       21,691,169
                                                   ---------------
                 SWITZERLAND (5.8%)
                 BUSINESS SERVICES
           400   Societe Generale de Surveillance
                   Holdings S.A..................          956,105
                                                   ---------------
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                              VALUE
- ---------------                                    ---------------
<C>              <S>                               <C>
                 INSURANCE
         2,000   Schweizerische
                   Rueckversicherungs-
                   Gesellschaft..................  $     2,051,078
                                                   ---------------
                 MULTI-INDUSTRY
         2,260   ABB AG..........................        2,792,083
                                                   ---------------
                 PHARMACEUTICALS
         1,294   Ciba-Geigy AG...................        1,574,900
           365   Roche Holdings AG...............        2,780,467
         2,050   Sandoz AG.......................        2,341,221
         1,000   Sandoz AG (Series B)............        1,135,674
                                                   ---------------
                                                         7,832,262
                                                   ---------------
                 TOTAL SWITZERLAND...............       13,631,528
                                                   ---------------
 
                 UNITED KINGDOM (29.8%)
                 AEROSPACE & DEFENSE
       133,333   British Aerospace PLC...........        2,013,456
                                                   ---------------
                 AUTOMOTIVE
       405,000   BBA Group PLC...................        1,935,022
       450,000   Rolls-Royce PLC.................        1,557,432
                                                   ---------------
                                                         3,492,454
                                                   ---------------
                 BANKING
       225,000   Abbey National PLC..............        1,896,156
       100,000   National Westminster Bank
                   PLC...........................          952,928
       180,000   TSB Group PLC...................          879,984
                                                   ---------------
                                                         3,729,068
                                                   ---------------
                 BREWERS
       145,000   Scottish & Newcastle Breweries
                   PLC...........................        1,485,264
       235,000   Vaux Group PLC..................        1,035,805
                                                   ---------------
                                                         2,521,069
                                                   ---------------
                 BROADCAST MEDIA
       147,000   British Sky Broadcasting Group
                   PLC...........................        1,003,834
       155,000   Flextech PLC*...................        1,222,045
                                                   ---------------
                                                         2,225,879
                                                   ---------------
                 BUILDING & CONSTRUCTION
       313,000   Blue Circle Industries PLC......        1,748,794
       207,400   CRH PLC.........................        2,098,689
       217,800   Williams Holdings PLC...........        1,139,146
                                                   ---------------
                                                         4,986,629
                                                   ---------------
                 BUSINESS SERVICES
       150,000   Reuters Holdings PLC............        1,813,512
                                                   ---------------
                 CHEMICALS
       306,000   Albright & Wilson PLC...........          845,343
                                                   ---------------
                 COMPUTER SOFTWARE & SERVICES
       151,500   Sage Group (The) PLC............        1,147,425
        96,000   SEMA Group PLC..................        1,095,091
                                                   ---------------
                                                         2,242,516
                                                   ---------------
                 COMPUTERS
       350,000   Amstrad PLC.....................        1,048,376
                                                   ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--EUROPEAN GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                              VALUE
- ---------------                                    ---------------
<C>              <S>                               <C>
                 CONGLOMERATES
       152,000   BTR PLC.........................  $       596,837
       415,000   Tomkins PLC.....................        1,558,674
                                                   ---------------
                                                         2,155,511
                                                   ---------------
                 ELECTRICAL EQUIPMENT
       145,250   The BICC Group PLC..............          703,335
                                                   ---------------
                 FOOD PROCESSING
       275,000   Associated British Foods PLC....        1,651,716
                                                   ---------------
                 FOOD, BEVERAGE, TOBACCO & HOUSEHOLD PRODUCTS
        94,261   B.A.T. Industries PLC...........          732,928
       187,000   Grand Metropolitan PLC..........        1,239,256
       177,500   Tate & Lyle PLC.................        1,261,698
                                                   ---------------
                                                         3,233,882
                                                   ---------------
                 FOREST PRODUCTS, PAPER & PACKAGING
        90,000   De La Rue PLC...................          828,302
                                                   ---------------
                 INSURANCE
        55,000   Britannic Assurance PLC.........          613,738
       123,057   Commercial Union PLC............        1,103,413
       261,200   Prudential Corp. PLC............        1,645,853
       213,000   Royal Insurance Holdings PLC....        1,315,692
       100,000   Sun Alliance Group PLC..........          578,896
                                                   ---------------
                                                         5,257,592
                                                   ---------------
                 LEISURE
       180,000   Granada Group PLC...............        2,402,496
                                                   ---------------
                 METALS & MINING
       125,750   Smiths Industries PLC...........        1,375,906
                                                   ---------------
                 MISCELLANEOUS
       146,000   Vendome Luxury Group PLC
                   (Units)++.....................        1,355,020
                                                   ---------------
                 NATURAL GAS
       240,000   British Gas PLC.................          666,739
                                                   ---------------
                 OIL RELATED
       591,000   Lasmo PLC.......................        1,605,156
       245,000   Shell Transport & Trading Co.
                   PLC...........................        3,589,466
                                                   ---------------
                                                         5,194,622
                                                   ---------------
                 PHARMACEUTICALS
        17,050   British Biotech PLC*............          653,602
         2,131   British Biotech PLC (Rights)*...           12,899
       279,100   Glaxo Wellcome PLC..............        3,755,525
       554,166   Medeva PLC......................        2,167,365
                                                   ---------------
                                                         6,589,391
                                                   ---------------
                 REAL ESTATE
       205,100   Hammerson PLC...................        1,165,034
                                                   ---------------
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                              VALUE
- ---------------                                    ---------------
<C>              <S>                               <C>
 
                 RETAIL
        74,000   Boots Co. PLC...................  $       663,821
       100,000   Great Universal Stores PLC......        1,014,232
       247,000   Morrison (W.M.) Supermarkets
                   PLC...........................          596,100
       214,000   Next PLC........................        1,869,881
       140,000   W.H. Smith Group PLC
                   (Class A).....................        1,029,907
                                                   ---------------
                                                         5,173,941
                                                   ---------------
                 TELECOMMUNICATIONS
       674,700   British Telecommunications
                   PLC...........................        3,623,085
       400,635   Securicor Group PLC
                   (Class A).....................        1,625,969
                                                   ---------------
                                                         5,249,054
                                                   ---------------
                 TRANSPORTATION
       140,500   British Airways PLC.............        1,205,850
                                                   ---------------
                 UTILITIES
       180,000   Scottish Power PLC..............          846,461
                                                   ---------------
                 TOTAL UNITED KINGDOM............       69,973,154
                                                   ---------------
                 TOTAL COMMON AND PREFERRED
                 STOCKS, BONDS, WARRANTS AND
                 RIGHTS
                 (IDENTIFIED COST
                 $178,129,189)...................      224,516,643
                                                   ---------------
</TABLE>
 
<TABLE>
<CAPTION>
   CURRENCY
  AMOUNT (IN
  THOUSANDS)
- ---------------
<C>              <S>                               <C>
                 PURCHASED PUT OPTION ON FOREIGN CURRENCY (0.1%)
    FRF 16,500   November 5, 1996/FRF 5.192
                   (Identified Cost $333,300)....          194,700
                                                   ---------------
</TABLE>
 
<TABLE>
<CAPTION>
   PRINCIPAL
  AMOUNT (IN
  THOUSANDS)
- ---------------
<C>              <S>                               <C>
                 SHORT-TERM INVESTMENT (A) (3.0%)
                 U.S. GOVERNMENT AGENCY
 $       7,000   Federal Home Loan Mortgage Corp.
                   5.26% due 07/03/96 (Amortized
                   Cost $6,997,954)..............        6,997,954
                                                   ---------------
TOTAL INVESTMENTS (IDENTIFIED
  COST $185,460,443) (B).........       98.9%    231,709,297
CASH AND OTHER ASSETS IN EXCESS
  OF LIABILITIES.................        1.1       2,480,229
                                   ----------  -------------
NET ASSETS.......................      100.0%  $ 234,189,526
                                   ----------  -------------
                                   ----------  -------------
 
<FN>
- ------------------
ADR  AMERICAN DEPOSITORY RECEIPT.
 K   IN THOUSANDS.
 *   NON-INCOME PRODUCING SECURITY.
++   CONSISTS OF MORE THAN ONE CLASS OF SECURITIES TRADED TOGETHER AS A UNIT;
     GENERALLY STOCKS WITH ATTACHED STOCKS/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 WAS $49,619,563 AND THE
     AGGREGATE GROSS UNREALIZED DEPRECIATION  WAS $3,370,709, RESULTING IN  NET
     UNREALIZED APPRECIATION OF $46,248,854.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--EUROPEAN GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
 
FORWARD FOREIGN CURRENCY CONTRACTS OPEN AT JUNE 30, 1996:
 
<TABLE>
<CAPTION>
                                                UNREALIZED
  CONTRACTS TO      IN EXCHANGE     DELIVERY   APPRECIATION
    RECEIVE             FOR           DATE    (DEPRECIATION)
- ----------------  ----------------  --------  ---------------
<S>  <C>          <C>    <C>        <C>       <C>
CHF    1,294,749  $      1,033,319  07/01/96  $       (2,314)
$        270,304  L        174,165  07/01/96            (122)
CHF    1,287,990  $      1,027,925  07/02/96            (657)
$        195,576  DEM      298,038  07/02/96              90
L        154,356  $        239,560  07/02/96           1,482
L         28,096  $         43,605  07/03/96              90
                                                     -------
                         Net unrealized
                         depreciation................$(1,431)
                                                     -------
                                                     -------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--EUROPEAN GROWTH
SUMMARY OF INVESTMENTS JUNE 30, 1996 (UNAUDITED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                             PERCENT OF
INDUSTRY                        VALUE        NET ASSETS
- --------------------------  --------------  -------------
<S>                         <C>             <C>
Aerospace & Defense.......  $    2,013,456          0.9%
Air Transport.............       1,452,223          0.6
Automotive................       8,307,760          3.5
Banking...................       6,500,602          2.8
Banks.....................       5,208,557          2.2
Brewers...................       2,521,069          1.1
Broadcast Media...........       2,225,878          1.0
Building & Construction...       4,986,629          2.1
Building Materials........       2,200,485          1.0
Business Services.........       8,043,256          3.4
Chemicals.................       9,001,677          3.8
Computer Software &
  Services................       2,242,516          1.0
Computers.................       1,048,376          0.4
Conglomerates.............       2,155,511          0.9
Electrical Equipment......       1,173,056          0.5
Electronics...............       3,585,482          1.5
Financial Services........       4,632,186          2.0
Food Distribution.........       2,771,373          1.2
Food Manufacturer.........       1,465,098          0.6
Food Processing...........       3,837,956          1.7
Food, Beverage, Tobacco &
  Household Products......      11,149,690          4.8
Foreign Currency Put
  Option..................         194,700          0.1
Forest Products, Paper &
  Packaging...............         828,302          0.3
Health & Personal Care....       4,620,034          2.0
 
<CAPTION>
                                             PERCENT OF
INDUSTRY                        VALUE        NET ASSETS
- --------------------------  --------------  -------------
<S>                         <C>             <C>
Household Furnishings &
  Appliances..............  $    1,522,125          0.7%
Insurance.................      18,756,171          8.0
Leisure...................       2,402,496          1.0
Machinery.................       2,107,228          0.9
Manufacturing.............       3,958,065          1.6
Merchandising.............       3,947,284          1.6
Metals & Mining...........       1,375,906          0.6
Miscellaneous.............       1,355,020          0.5
Multi-Industry............       6,566,896          2.8
Natural Gas...............         666,739          0.2
Oil & Gas Products........       4,471,946          1.8
Oil Related...............       9,415,529          4.1
Pharmaceuticals...........      21,559,351          9.3
Publishing................      11,217,526          4.8
Real Estate...............       1,165,034          0.5
Retail....................      18,231,179          7.8
Steel & Iron..............       1,801,485          0.8
Telecommunication
  Equipment...............       2,871,278          1.2
Telecommunications........       8,820,856          3.8
Textiles..................       4,312,974          1.9
Transportation............       2,714,708          1.2
U.S. Government Agency....       6,997,954          3.0
Utilities.................       3,305,675          1.4
                            --------------        -----
                            $  231,709,297         98.9%
                            --------------        -----
                            --------------        -----
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                         PERCENT OF
TYPE OF INVESTMENT                                                                          VALUE        NET ASSETS
- --------------------------------------------------------------------------------------  --------------  -------------
<S>                                                                                     <C>             <C>
Common Stocks.........................................................................  $  222,191,389         94.9%
Convertible Preferred Stocks..........................................................         301,648          0.1
Foreign Currency Put Option...........................................................         194,700          0.1
Preferred Stocks......................................................................       1,937,337          0.8
Rights................................................................................          12,899       --
Short-Term Investment.................................................................       6,997,954          3.0
Warrants..............................................................................          73,370       --
                                                                                        --------------        -----
                                                                                        $  231,709,297         98.9%
                                                                                        --------------        -----
                                                                                        --------------        -----
</TABLE>
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--PACIFIC GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                             VALUE
- ---------------                                   ---------------
<C>              <S>                              <C>
                 COMMON AND PREFERRED STOCKS, WARRANTS, RIGHTS
                   AND BONDS (96.2%)
                 AUSTRALIA (1.5%)
                 COMMERCIAL SERVICES
        75,000   Mayne Nickless Ltd.............  $       438,667
                                                  ---------------
                 FOOD, BEVERAGE, TOBACCO & HOUSEHOLD PRODUCTS
        99,000   Fosters Brewing Group Ltd.
                   (New)........................          170,673
                                                  ---------------
                 METALS & MINING
        18,000   CRA Ltd........................          277,157
       200,000   M.I.M. Holdings, Ltd...........          258,202
       130,000   North Ltd......................          373,526
        38,750   Odin Mining & Investment Co.,
                   Ltd..........................            7,779
                                                  ---------------
                                                          916,664
                                                  ---------------
                 OIL RELATED
       100,000   Santos, Ltd....................          346,368
        50,000   Woodside Petroleum Ltd.........          300,710
                                                  ---------------
                                                          647,078
                                                  ---------------
                 TRANSPORTATION
        14,500   Brambles Industries, Ltd.......          201,807
                                                  ---------------
                 TOTAL AUSTRALIA................        2,374,889
                                                  ---------------
                 CHINA (0.6%)
                 TRANSPORTATION
       160,000   Jinhui Shipping and
                   Transportation Ltd...........          152,561
                                                  ---------------
                 UTILITIES
        20,000   Huaneng Power International,
                   Inc. (ADR)*..................          357,500
        45,000   Shandong Huaneng Power Co.,
                   Ltd. (ADR)...................          371,250
                                                  ---------------
                                                          728,750
                                                  ---------------
                 TOTAL CHINA....................          881,311
                                                  ---------------
                 HONG KONG (21.5%)
                 BANKING
       163,000   Bank of East Asia, Ltd.........          595,966
        80,000   Dao Heng Bank Group Ltd........          309,036
        75,000   Guoco Group Ltd................          357,549
       100,000   Hang Seng Bank Ltd.............        1,007,726
        92,000   HSBC Holdings PLC..............        1,390,662
       500,000   International Bank of Asia.....          322,989
                                                  ---------------
                                                        3,983,928
                                                  ---------------
                 BUSINESS SERVICES
       350,000   First Pacific Co. Ltd..........          538,100
                                                  ---------------
                 CONGLOMERATES
       150,000   Citic Pacific, Ltd.............          606,573
       106,136   Henderson China Holding
                   Ltd.*........................          237,223
       425,000   Hutchison Whampoa, Ltd.........        2,674,027
        60,000   Jardine Matheson Holdings
                   Ltd..........................          441,000
       120,170   New World Infrastructure
                   Ltd.*........................          256,170
       234,000   Swire Pacific Ltd. (Class A)...        2,002,855
                                                  ---------------
                                                        6,217,848
                                                  ---------------
 
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                             VALUE
- ---------------                                   ---------------
<C>              <S>                              <C>
                 ELECTRONIC & ELECTRICAL EQUIPMENT
       250,000   ASM Pacific Technology Ltd.....  $       197,023
                                                  ---------------
                 ENGINEERING & CONSTRUCTION
       600,000   Road King Infrastructure
                   Ltd.*........................          657,768
                                                  ---------------
                 FINANCIAL SERVICES
         $ 425K  Henderson Capital International
                   4.50% due 10/27/96 (Conv.)...          358,062
     1,000,000   Manhattan Card Co. Ltd.........          478,024
         $ 120 K Paliburg International Finance
                   - 144A** 3.50% due 02/06/01
                   (Conv.)......................          116,700
                                                  ---------------
                                                          952,786
                                                  ---------------
                 FOOD PROCESSING
     1,000,000   Tingyi Holding Co..............          274,541
                                                  ---------------
                 HOTELS/MOTELS
       224,000   Shangri-La Asia Ltd............          313,997
                                                  ---------------
                 INSURANCE
       389,000   National Mutual Asia Ltd.......          341,748
                                                  ---------------
                 INVESTMENT COMPANIES
       800,000   Guangdong Investments..........          506,447
                                                  ---------------
                 LEISURE
     1,775,000   CDL Hotels International,
                   Ltd..........................          974,620
                                                  ---------------
                 OIL RELATED
       505,000   Hong Kong & China Gas
                   Co...........................          805,761
        39,500   Hong Kong & China Gas
                   Co. (Warrants due
                   09/30/97)*...................           10,334
                                                  ---------------
                                                          816,095
                                                  ---------------
                 PUBLISHING
       550,000   South China Morning Post
                   (Holdings) Ltd...............          376,605
                                                  ---------------
                 REAL ESTATE
       487,000   Amoy Properties, Ltd...........          588,286
       442,000   Cheung Kong (Holdings)
                   Ltd..........................        3,183,574
       200,000   Great Eagle Holding Co.........          585,256
       330,000   Henderson Investment, Ltd......          296,310
       119,000   Henderson Land Development Co.
                   Ltd..........................          891,708
       380,000   Hong Kong Land Holdings
                   Ltd..........................          855,000
       125,000   Hysan Development Co.
                   Ltd..........................          382,742
         6,250   Hysan Development Co.
                   Ltd. (Warrants due
                   04/30/98)*...................            3,311
        90,000   New Asia Realty & Trust Co.
                   (Class A)....................          290,690
       155,000   New World Development..........          718,909
       285,000   Sun Hung Kai Properties
                   Ltd..........................        2,881,224
       167,000   Wharf (Holdings) Ltd...........          597,646
                                                  ---------------
                                                       11,274,656
                                                  ---------------
                 RETAIL
       266,000   Dickson Concepts International
                   Ltd..........................          340,224
                                                  ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--PACIFIC GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                             VALUE
- ---------------                                   ---------------
<C>              <S>                              <C>
                 RETAIL - SPECIALTY
       480,000   Giordano International Ltd.....  $       465,104
                                                  ---------------
                 TELECOMMUNICATIONS
     1,303,400   Hong Kong Telecommunications
                   Ltd..........................        2,340,671
                                                  ---------------
                 TRANSPORTATION
       200,000   Cathay Pacific Airways.........          366,916
       944,000   The Guangshen Railway Co.,
                   Ltd..........................          356,735
                                                  ---------------
                                                          723,651
                                                  ---------------
                 UTILITIES
        70,500   China Light & Power Co.
                   Ltd..........................          319,701
       300,000   Consolidated Electric Power
                   Asia Ltd.....................          496,111
       240,000   Hong Kong Electric Holdings
                   Ltd..........................          731,764
                                                  ---------------
                                                        1,547,576
                                                  ---------------
                 TOTAL HONG KONG................       32,843,388
                                                  ---------------
                 INDONESIA (8.3%)
                 AUTOMOTIVE
       530,000   PT Astra International.........          769,024
     1,250,000   PT Gadjah Tunggal..............          618,014
                                                  ---------------
                                                        1,387,038
                                                  ---------------
                 BANKING
       300,000   PT Bank Dagang Nasional
                   Indonesia....................          251,505
       220,000   PT Bank Internasional
                   Indonesia....................        1,087,704
                                                  ---------------
                                                        1,339,209
                                                  ---------------
                 BUILDING & CONSTRUCTION
       170,000   PT Indocement..................          584,695
                                                  ---------------
                 BUILDING MATERIALS
       688,380   PT Mulia Industrindo...........        1,021,028
       275,352   PT Mulia Industrindo
                   (Nil Paid) (Rights)*.........          207,165
       200,000   PT Semen Gresik
                   (Alien Market)...............          582,545
                                                  ---------------
                                                        1,810,738
                                                  ---------------
                 COMMERCIAL SERVICES
       300,000   PT Steady Safe.................          432,072
                                                  ---------------
                 CONSTRUCTION EQUIPMENT
       340,000   PT United Tractors.............          537,188
                                                  ---------------
                 FOOD, BEVERAGE, TOBACCO & HOUSEHOLD PRODUCTS
       130,000   PT Hanjaya Mandala
                   Sampoerna....................        1,481,083
       121,775   PT Indofood Sukses
                   Makmur.......................          549,715
                                                  ---------------
                                                        2,030,798
                                                  ---------------
                 FOREST PRODUCTS, PAPER & PACKAGING
       500,000   PT Indah Kiat Pulp Paper
                   Corp.........................          489,037
         6,144   PT Pabrikkertas Tjiwi Kimia....            6,274
                                                  ---------------
                                                          495,311
                                                  ---------------
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                             VALUE
- ---------------                                   ---------------
<C>              <S>                              <C>
                 INVESTMENT COMPANIES
             1   Peregrine Indonesia*
                   (Units)++***.................  $       445,000
                                                  ---------------
                 MACHINERY
       300,000   PT Bukaka Teknik Utama.........          451,419
                                                  ---------------
                 METALS
       660,000   PT Tambang Timah...............        1,220,120
                                                  ---------------
                 PHARMACEUTICALS
        90,000   PT Tempo Scan Pacific..........          193,465
                                                  ---------------
                 PHOTOGRAPHY
        95,000   PT Modern Photo &
                   Film Co......................          408,427
                                                  ---------------
                 TELECOMMUNICATIONS
       240,000   PT Indosat.....................          807,395
       300,000   PT Telekomunikasi Indonesia....          454,643
                                                  ---------------
                                                        1,262,038
                                                  ---------------
                 TOTAL INDONESIA................       12,597,518
                                                  ---------------
                 JAPAN (13.2%)
                 AEROSPACE & DEFENSE
        35,000   Ishikawajima-Harima Heavy
                   Industry.....................          170,708
                                                  ---------------
                 AUTOMOTIVE
         1,000   Autobacs Seven Co..............           96,636
        11,000   Honda Motor Co.................          284,803
        46,000   Isuzu Motors Ltd...............          262,522
        12,000   Toyota Motor Corp..............          299,754
                                                  ---------------
                                                          943,715
                                                  ---------------
                 BANKING
        17,000   Asahi Bank, Ltd................          196,827
        11,450   Bank of Tokyo - Mitsubishi
                   Ltd..........................          265,138
         6,000   Bank of Tokyo - Mitsubishi
                   Ltd.*........................          139,484
         9,000   Dai-Ichi Kangyo Bank...........          167,381
        15,000   Long Term Credit Bank of
                   Japan........................          116,100
        20,000   Mitsui Trust & Banking.........          233,385
        13,000   Sanwa Bank, Ltd................          240,587
        15,000   Shizuoka Bank..................          192,816
        10,000   Sumitomo Bank..................          193,272
        14,000   Sumitomo Trust & Banking.......          191,449
                                                  ---------------
                                                        1,936,439
                                                  ---------------
                 BUILDING & CONSTRUCTION
         3,000   Higashi Nihon House............           52,512
         3,300   Japan Industrial Land
                   Development..................          103,191
        22,000   Kajima Corp....................          226,639
         5,000   Kaneshita Construction.........           63,816
        11,000   Maeda Road Construction........          189,534
         5,000   Mitsui Home Co., Ltd...........           81,138
                                                  ---------------
                                                          716,830
                                                  ---------------
                 BUILDING MATERIALS
         4,400   Oriental Construction Co.......           73,407
        28,000   Sanwa Shutter..................          262,923
        10,000   Shin Nikkei Co., Ltd...........           74,756
         9,000   Toyo Shutter...................           85,331
                                                  ---------------
                                                          496,417
                                                  ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--PACIFIC GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                             VALUE
- ---------------                                   ---------------
<C>              <S>                              <C>
                 BUSINESS SERVICES
         6,000   Ichiken Co., Ltd...............  $        58,529
         2,000   Nippon Kanzai..................           61,264
         1,900   Nissin Co. Ltd.................           84,876
         3,000   Secom..........................          198,013
         5,000   Tanseisha Co...................           68,830
                                                  ---------------
                                                          471,512
                                                  ---------------
                 CHEMICALS
         2,000   Maezawa Kasei Industries.......           85,878
        37,000   Mitsubishi Chemical Corp.......          170,681
        33,000   Nippon Zeon Co. Ltd............          204,577
        12,000   Sakai Chemical Industry Co.....           77,673
         9,450   Shin-Etsu Chemical Co..........          180,919
                                                  ---------------
                                                          719,728
                                                  ---------------
                 COMMERCIAL SERVICES
         6,000   Kawasho Lease System
                   Corp.........................           71,109
         2,200   Nichii Gakkan Co...............          114,322
                                                  ---------------
                                                          185,431
                                                  ---------------
                 COMPUTER SOFTWARE & SERVICES
         2,000   Enix Corp......................           62,540
         5,000   Ines...........................           93,445
         4,000   Meitec.........................           90,801
             5   NTT Data Communications Systems
                   Corp.........................          149,512
                                                  ---------------
                                                          396,298
                                                  ---------------
                 COMPUTERS
        16,000   Fujitsu, Ltd...................          145,866
         1,200   Mars Engineering Corp..........           94,630
           500   TKC Corp.......................           14,769
                                                  ---------------
                                                          255,265
                                                  ---------------
                 COMPUTERS - SYSTEMS
         3,000   Daiwabo Information Systems
                   Co...........................           73,334
                                                  ---------------
                 DATA PROCESSING
         6,000   Ricoh Elemex...................           92,989
                                                  ---------------
                 ELECTRICAL EQUIPMENT
         4,000   Maspro Denkoh Corp.............           97,730
                                                  ---------------
                 ELECTRONIC & ELECTRICAL EQUIPMENT
         5,000   Aiwa Co........................          106,208
         5,000   Canon, Inc.....................          103,929
       Y 9,000K  Canon, Inc. 1.00% due 12/20/02
                   (Conv.)......................          124,305
        24,000   Hitachi, Ltd...................          223,174
         3,000   Kyocera Corp...................          211,961
         1,500   Mabuchi Motor Co...............           95,451
         3,000   Mitsui High-Tec................           70,016
         4,000   Murata Manufacturing Co.,
                   Ltd..........................          151,336
         7,000   Nitto Electric Works...........          115,507
         8,000   Omron Corp.....................          169,933
        12,000   Sharp Corp.....................          210,047
         4,100   Sony Corp......................          269,496
                                                  ---------------
                                                        1,851,363
                                                  ---------------
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                             VALUE
- ---------------                                   ---------------
<C>              <S>                              <C>
                 ELECTRONICS
        28,000   Fujikura Ltd...................  $       231,780
        10,000   Nissin Electric................           83,143
         2,000   Rohm Co., Ltd..................          132,008
         3,000   Ryoyo Electro Corp.............           64,546
                                                  ---------------
                                                          511,477
                                                  ---------------
                 ENTERTAINMENT
         2,000   H.I.S. Company Ltd.............          121,615
                                                  ---------------
                 FINANCIAL SERVICES
        15,000   Daiwa Securities Co., Ltd......          192,816
         1,900   Nichiei Co., Ltd. (Kyoto)......          126,447
        10,000   Nomura Securities Co. Ltd......          195,095
         2,800   Promise Co., Ltd...............          137,843
         1,000   Sanyo Shinpan Finance Co.,
                   Ltd..........................           63,907
         3,000   Shinki Co. Ltd.................          103,929
                                                  ---------------
                                                          820,037
                                                  ---------------
                 FOOD, BEVERAGE, TOBACCO & HOUSEHOLD PRODUCTS
         3,800   Amway Japan, Ltd...............          190,537
        14,000   Nippon Meat Packers, Inc.......          199,107
         1,000   Plenus Company, Ltd............           45,127
         4,000   Stamina Foods..................           38,290
             4   Yoshinoya D & C Company
                   Ltd..........................           53,970
                                                  ---------------
                                                          527,031
                                                  ---------------
                 FOREST PRODUCTS, PAPER & PACKAGING
        10,000   Daishowa Paper Manufacturing
                   Co. Ltd.*....................           77,035
                                                  ---------------
                 HEALTH & PERSONAL CARE
         5,000   Kawasumi Laboratories, Inc.....           75,668
                                                  ---------------
                 HOUSEHOLD FURNISHINGS & APPLIANCES
         3,000   Beltecno Corp..................           35,008
         6,000   Juken Sangyo Co................           65,093
                                                  ---------------
                                                          100,101
                                                  ---------------
                 INDUSTRIALS
        10,000   Nippon Thompson Co.............           86,152
        16,000   Tokai Carbon Co., Ltd.*........           88,249
                                                  ---------------
                                                          174,401
                                                  ---------------
                 INSURANCE
        15,000   Tokio  Marine &  Fire Insurance
                 Co.............................          199,654
        16,000   Yasuda Fire & Marine
                   Insurance*...................          119,464
                                                  ---------------
                                                          319,118
                                                  ---------------
                 MACHINE TOOLS
         2,000   Nitto Kohki Co. Ltd............           91,166
        10,000   OSG Corp.......................           76,671
                                                  ---------------
                                                          167,837
                                                  ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--PACIFIC GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                             VALUE
- ---------------                                   ---------------
<C>              <S>                              <C>
                 MACHINERY
         8,000   Aichi Corp.....................  $        86,061
         7,000   CKD Corp.......................           72,750
        16,000   Daifuku Co. Ltd................          245,054
         4,700   Fanuc, Ltd.....................          186,817
         3,000   Fuji Machine Manufacturing
                   Co...........................           84,511
         1,700   Keyence Corp...................          230,924
      Y 19,000K  Minebea Co. Ltd. 0.80% due
                   03/31/03 (Conv.).............          194,001
        24,000   Mitsubishi Heavy Industries,
                   Ltd..........................          208,515
         5,000   Sansei Yusoki Co., Ltd.........           72,021
         7,000   Sintokogio.....................           64,454
         5,000   Takuma Co., Ltd................           75,668
        11,000   Tsudakoma......................           77,719
                                                  ---------------
                                                        1,598,495
                                                  ---------------
                 MANUFACTURING
         5,000   Arcland Sakamoto...............           78,403
         8,000   Bridgestone Metalpha Corp......          114,505
         9,000   Daiwa House Industry...........          139,484
         8,000   Itoki Crebio Corp..............           72,276
         1,500   KDD............................          158,629
         4,400   Nichiha Corp...................           89,051
        10,000   Nippon Electric Glass Co.,
                   Ltd..........................          170,480
         4,000   Noritsu Koki Co. Ltd...........          202,024
         4,000   Sony Music Entertainment
                   Inc..........................          185,979
        13,000   Tokyo Style....................          226,365
                                                  ---------------
                                                        1,437,196
                                                  ---------------
                 MEDICAL SUPPLIES
         1,100   Paramount Bed Co...............           75,112
        15,000   Shimadzu Corp..................          100,647
         9,000   Terumo.........................          114,049
                                                  ---------------
                                                          289,808
                                                  ---------------
                 MERCHANDISING
         3,000   Misumi Corp....................          107,485
                                                  ---------------
                 METALS
         6,000   Takada Kiko....................           60,717
         9,200   Tokyo Steel Manufacturing......          180,326
                                                  ---------------
                                                          241,043
                                                  ---------------
                 METALS & MINING
        31,000   Nippon Light Metal Co..........          175,786
        75,000   Nippon Steel Co................          257,088
                                                  ---------------
                                                          432,874
                                                  ---------------
                 MULTI-INDUSTRY
        26,000   Mitsui & Co....................          235,372
         3,500   Trusco Nakayama Corp...........           91,257
         5,000   Yamae Hisano...................           46,951
                                                  ---------------
                                                          373,580
                                                  ---------------
                 NATURAL GAS
        56,000   Tokyo Gas Co., Ltd.............          204,212
                                                  ---------------
                 OIL RELATED
        16,000   General Sekiyu.................          140,760
                                                  ---------------
                 PHARMACEUTICALS
        12,500   Eisai Co. Ltd..................          235,892
                                                  ---------------
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                             VALUE
- ---------------                                   ---------------
<C>              <S>                              <C>
                 REAL ESTATE
         8,000   Cesar Co.......................  $        79,497
         5,000   Chubu Sekiwa Real Estate,
                   Ltd..........................           80,682
         4,000   Fuso Lexel, Inc................           47,406
         5,000   Kansai Sekiwa Real Estate......           95,724
        20,000   Mitsui Fudosan Co..............          269,851
         5,000   Sekiwa Real Estate.............           52,420
         5,000   Tohoku Misawa Homes Co.,
                   Ltd..........................           68,830
                                                  ---------------
                                                          694,410
                                                  ---------------
                 RETAIL
           200   Belluna Co., Ltd...............            4,613
         3,300   Ministop Co., Ltd..............           87,848
         3,000   Seven - Eleven Japan...........          191,175
         6,000   Shimachu Co., Ltd..............          177,774
         2,000   Sundrug Co., Ltd...............           88,249
         2,000   Xebio Co. Ltd..................           74,938
                                                  ---------------
                                                          624,597
                                                  ---------------
                 RETAIL - GENERAL MERCHANDISE
         2,000   Circle K Japan Co. Ltd.........          103,565
         1,000   Ryohin Keikaku Co. Ltd.........           90,072
                                                  ---------------
                                                          193,637
                                                  ---------------
                 RETAIL - SPECIALTY
         4,000   Aderans Co. Ltd................          106,482
         1,000   Paris Miki Inc.................           46,495
         5,000   Seijo Corp.....................          147,233
                                                  ---------------
                                                          300,210
                                                  ---------------
                 TELECOMMUNICATIONS
            30   DDI Corp.......................          261,464
        17,000   Nippon Comsys Co...............          229,374
                                                  ---------------
                                                          490,838
                                                  ---------------
                 TEXTILES
         5,000   Chuo Warehouse.................           65,640
        18,000   Kuraray Co. Ltd................          201,842
         1,700   Maruco Co., Ltd................          152,657
                                                  ---------------
                                                          420,139
                                                  ---------------
                 TRANSPORTATION
            33   East Japan Railway Co..........          172,988
        17,000   Fukuyama Transporting Co.......          164,281
        18,000   Kamigumi Co. Ltd...............          164,099
         3,000   Kanto Seino Transportation.....           90,254
        21,000   Tokyu Corp.....................          159,860
                                                  ---------------
                                                          751,482
                                                  ---------------
                 UTILITIES
         5,900   Hokkaido Electric Power........          130,167
                                                  ---------------
                 WHOLESALE & INTERNATIONAL TRADE
         2,400   Satori Electric Co. Ltd........           83,143
                                                  ---------------
                 WHOLESALE DISTRIBUTOR
         4,000   Wakita & Co....................           60,899
                                                  ---------------
                 TOTAL JAPAN....................       20,112,946
                                                  ---------------
                 MALAYSIA (16.5%)
                 AGRICULTURE
       245,000   Highlands & Lowlands
                   Berhad.......................          434,202
       170,000   Lingui Developments Berhad.....          402,165
                                                  ---------------
                                                          836,367
                                                  ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--PACIFIC GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                             VALUE
- ---------------                                   ---------------
<C>              <S>                              <C>
                 AUTOMOTIVE
        40,000   Cycle & Carriage Bintang
                   Berhad.......................  $       259,824
       160,000   Diversified Resources
                   Berhad.......................          551,724
        42,000   Oriental Holdings Berhad.......          274,499
        75,000   Perusahaan Otomobil Nasional
                   Berhad.......................          408,982
       185,000   Tan Chong Motor Holdings
                   Berhad.......................          270,008
                                                  ---------------
                                                        1,765,037
                                                  ---------------
                 BANKING
       127,600   Malayan Banking Berhad.........        1,227,907
       170,000   Public Bank Berhad
                   (Alien Market)...............          470,329
        30,000   Public Bank Berhad
                   (Alien Market)...............           84,225
                                                  ---------------
                                                        1,782,461
                                                  ---------------
                 BANKS - COMMERCIAL
        95,000   DCB Holdings Berhad............          325,682
        37,500   DCB Holdings Berhad (Warrants
                   due 12/27/99)*...............           49,318
       152,000   Kwong Yik Bank.................          341,299
                                                  ---------------
                                                          716,299
                                                  ---------------
                 BUILDING & CONSTRUCTION
        50,000   Gamuda Berhad..................          314,755
        32,000   Hume Industries (Malaysia)
                   Berhad.......................          156,536
       120,000   Kedah Cement Berhad............          222,294
       150,000   Malayan Cement Berhad..........          360,866
       150,000   Metacorp Berhad................          433,039
       152,000   Sungei Way Holdings
                   Berhad.......................          713,071
       135,000   United Engineers Malaysia
                   Berhad.......................          936,448
                                                  ---------------
                                                        3,137,009
                                                  ---------------
                 CHEMICALS
       125,000   Chemical Co. of Malaysia
                   Berhad.......................          400,962
        31,250   Chemical Co. of Malaysia
                   Berhad
                   (Warrants due 11/07/00)*  ...           39,846
                                                  ---------------
                                                          440,808
                                                  ---------------
                 CONGLOMERATES
       280,000   Malaysian Resources Corp.
                   Berhad.......................          684,844
       210,000   Renong Berhad..................          335,124
                                                  ---------------
                                                        1,019,968
                                                  ---------------
                 CONSTRUCTION PLANT & EQUIPMENT
        97,500   YTL Corp. Berhad...............          508,220
                                                  ---------------
                 ELECTRONIC & ELECTRICAL EQUIPMENT
        39,666   Leader Universal Holdings
                   Berhad.......................          112,127
                                                  ---------------
                 ENTERTAINMENT
       325,000   Magnum Corporation Berhad......          549,920
       254,000   Resorts World Berhad...........        1,456,375
                                                  ---------------
                                                        2,006,295
                                                  ---------------
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                             VALUE
- ---------------                                   ---------------
<C>              <S>                              <C>
                 FINANCIAL SERVICES
       266,000   Affin Holdings Berhad..........  $       623,937
       105,000   Gadek Capital Berhad...........          332,598
       225,000   Public Finance Berhad..........          405,974
        72,000   Public Finance Berhad
                   (Rights)*....................           40,417
        50,000   Rashid Hussain Berhad..........          183,440
                                                  ---------------
                                                        1,586,366
                                                  ---------------
                 INSURANCE
        70,000   Malaysia Assurance.............          370,489
        80,000   Pacific & Orient Berhad........          224,539
                                                  ---------------
                                                          595,028
                                                  ---------------
                 MANUFACTURING
           625   Box - Pak (Malaysia) Berhad....              388
       100,000   Kian Joo Can Factory Berhad....          557,338
        57,000   Malaysian Pacific Industries
                   Berhad.......................          237,691
        31,250   O.Y.L. Industries Berhad.......          325,782
         3,125   O.Y.L. Industries Berhad
                   (Rights)*....................           13,783
                                                  ---------------
                                                        1,134,982
                                                  ---------------
                 MULTI-INDUSTRY
       180,000   Multi-Purpose Holdings
                   Berhad.......................          290,136
       150,000   Nylex Berhad...................          577,386
                                                  ---------------
                                                          867,522
                                                  ---------------
                 OIL & GAS PRODUCTS
       160,000   Petronas Dagangan Berhad.......          433,039
                                                  ---------------
                 PLANTATION
       187,500   Kuala Lumpur Kepong
                   Berhad.......................          473,637
                                                  ---------------
                 REAL ESTATE
       100,000   IOI Properties Berhad..........          314,755
       277,500   Land & General Berhad..........          684,292
       268,000   Metroplex Berhad...............          287,987
       225,000   Pelangi Berhad.................          221,933
       300,000   Selangor Properties Berhad.....          365,678
                                                  ---------------
                                                        1,874,645
                                                  ---------------
                 TELECOMMUNICATIONS
       190,000   Technology Resources Industries
                   Berhad*......................          662,791
       306,000   Telekom Malaysia Berhad........        2,723,817
                                                  ---------------
                                                        3,386,608
                                                  ---------------
                 TRANSPORTATION
        80,000   Konsortium Perkapalan
                   Berhad.......................          481,155
       180,000   Malaysian Airline System
                   Berhad.......................          573,777
                                                  ---------------
                                                        1,054,932
                                                  ---------------
                 UTILITIES
        60,000   Malakoff Berhad................          262,229
        75,000   Prime Utilities Berhad.........          565,357
        12,000   Prime Utilities Berhad
                   (Warrants due 03/11/01)*.....           19,920
        24,000   Prime Utilities Berhad 1.00%
                   due 03/01/01 (Loan Stock)....            6,544
       145,000   Tenaga Nasional Berhad.........          610,465
                                                  ---------------
                                                        1,464,515
                                                  ---------------
                 TOTAL MALAYSIA.................       25,195,865
                                                  ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--PACIFIC GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                             VALUE
- ---------------                                   ---------------
<C>              <S>                              <C>
                 PAKISTAN (0.1%)
                 TELECOMMUNICATIONS
         1,100   Pakistan Telecommunications
                   Corp. (GDS)*.................  $       126,500
                                                  ---------------
                 PHILIPPINES (4.4%)
                 BANKING
        12,000   Far East Bank & Trust Co.......          422,341
           750   Far East Bank & Trust Co.
                   (Rights)*....................           26,397
        29,780   Philippine National Bank.......          498,422
       204,000   Security Bank Corp.............          550,191
                                                  ---------------
                                                        1,497,351
                                                  ---------------
                 BUILDING & CONSTRUCTION
        68,199   Bacnotan Consolidated
                   Industries...................          320,906
                                                  ---------------
                 CONGLOMERATES
       325,000   Ayala Corp. (B Shares).........          615,436
       160,000   First Philippine Holdings Corp.
                   (B Shares)...................          391,737
       600,000   JG Summit Holdings, Inc.
                   (B Shares)...................          224,943
                                                  ---------------
                                                        1,232,116
                                                  ---------------
                 ENGINEERING & CONSTRUCTION
       550,000   DMCI Holdings Inc..............          394,510
                                                  ---------------
                 FOREST PRODUCTS, PAPER & PACKAGING
       577,500   Paper Industries Corp..........          110,463
                                                  ---------------
                 REAL ESTATE
     3,000,000   Belle Corp.*...................          723,030
       460,000   Fil-Estate Land, Inc.*.........          589,518
                                                  ---------------
                                                        1,312,548
                                                  ---------------
                 TELECOMMUNICATIONS
       344,000   Pilipino Telephone Corp........          526,396
                                                  ---------------
                 UTILITIES
        75,000   Manila Electric Co.
                   (B Shares)...................          789,021
         1,300   Philippine Long Distance
                   Telephone Co.................           77,582
         6,650   Philippine Long Distance
                   Telephone Co. (ADR)..........          386,531
                                                  ---------------
                                                        1,253,134
                                                  ---------------
                 TOTAL PHILIPPINES..............        6,647,424
                                                  ---------------
                 SINGAPORE (12.1%)
                 APPLIANCES & HOUSEHOLD DURABLES
       300,000   Courts Ltd.....................          478,554
                                                  ---------------
                 AUTOMOTIVE
        25,000   Cycle and Carriage Ltd.........          267,636
                                                  ---------------
                 BANKING
       116,000   Development Bank of Singapore,
                   Ltd..........................        1,447,430
        80,000   Keppel Bank....................          246,154
        11,100   Overseas Chinese Banking Corp.,
                   Ltd. (Fully Paid)
                   (Rights)*....................           88,926
       111,000   Overseas Chinese Banking Corp.,
                   Ltd..........................        1,298,476
        81,000   Overseas Union Bank, Ltd.......          557,036
       161,000   United Overseas Bank, Ltd......        1,540,943
                                                  ---------------
                                                        5,178,965
                                                  ---------------
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                             VALUE
- ---------------                                   ---------------
<C>              <S>                              <C>
                 CONGLOMERATES
        45,000   Keppel Corp., Ltd..............  $       376,462
                                                  ---------------
                 ELECTRONIC & ELECTRICAL EQUIPMENT
       320,000   Venture Manufacturing Ltd......          589,862
        80,000   Venture Manufacturing Ltd.
                   (Rights)*....................           56,717
                                                  ---------------
                                                          646,579
                                                  ---------------
                 FINANCE
        85,000   Hong Leong Finance Ltd.........          297,696
                                                  ---------------
                 FOOD, BEVERAGE, TOBACCO & HOUSEHOLD PRODUCTS
        45,600   Fraser & Neave Ltd.............          472,003
                                                  ---------------
                 HOTELS
        50,000   Overseas Union Enterprise
                   Ltd..........................          272,953
       210,000   Republic Hotels & Resorts
                   Ltd..........................          278,412
        56,000   Republic Hotels & Resorts Ltd.
                   (Warrants due 07/12/00)*.....           32,754
                                                  ---------------
                                                          584,119
                                                  ---------------
                 MACHINERY
        65,000   Van Der Horst Ltd..............          304,147
                                                  ---------------
                 METALS
       340,000   Amtek Engineering Ltd..........          614,676
                                                  ---------------
                 PUBLISHING
        45,200   Singapore Press Holdings.......          887,657
                                                  ---------------
                 REAL ESTATE
        12,000   Bukit Sembawang Estates
                   Ltd..........................          312,230
       150,000   City Developments, Ltd.........        1,169,798
       160,000   DBS Land Ltd...................          549,025
       165,000   Parkway Holdings Ltd...........          491,315
        38,000   Singapore Land Ltd.............          257,285
       320,000   United Overseas Land, Ltd......          562,637
        37,000   United Overseas Land, Ltd.
                   (Fully Paid) (Warrants due
                   06/09/97)*...................           18,362
                                                  ---------------
                                                        3,360,652
                                                  ---------------
                 RETAIL
       450,000   Dairy Farm International
                   Holdings Ltd.................          380,250
                                                  ---------------
                 SHIPBUILDING
        60,000   Far East Levingston
                   Shipbuilding Ltd.............          331,797
       181,000   Sembawang Corp. Ltd............          898,263
                                                  ---------------
                                                        1,230,060
                                                  ---------------
                 STEEL & IRON
       200,000   Natsteel Ltd...................          397,022
                                                  ---------------
                 TELECOMMUNICATIONS
       350,000   Singapore Telecommunications,
                   Ltd..........................          933,002
                                                  ---------------
                 TRANSPORTATION
       350,000   Comfort Group Ltd..............          347,395
       166,000   Singapore Airlines Ltd.........        1,753,563
                                                  ---------------
                                                        2,100,958
                                                  ---------------
                 TOTAL SINGAPORE................       18,510,438
                                                  ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--PACIFIC GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                             VALUE
- ---------------                                   ---------------
<C>              <S>                              <C>
                 SOUTH KOREA (5.6%)
                 AUTOMOTIVE
        50,000   Hyundai Motor Co., Ltd. (GDR)..  $       625,000
        30,450   Kia Motors Corp. (GDR)* -
                   144A**.......................          502,425
                                                  ---------------
                                                        1,127,425
                                                  ---------------
                 BANKING
        33,000   Kangwon Bank...................          313,317
                                                  ---------------
                 CHEMICALS
        16,000   Sunkyong Ltd...................          329,470
                                                  ---------------
                 COMMUNICATIONS - EQUIPMENT/MANUFACTURERS
         3,500   LG Information & Communication
                   Ltd..........................          403,514
                                                  ---------------
                 ELECTRONIC & ELECTRICAL EQUIPMENT
         4,500   Samsung Electronics Co.........          377,867
           451   Samsung Electronics Co. (GDR) -
                   144A**.......................           22,775
         4,388   Samsung Electronics Co. -
                   144A** (Non-Voting)..........          106,936
           135   Samsung Electronics Co. -
                   144A** (Voting)..............            6,800
                                                  ---------------
                                                          514,378
                                                  ---------------
                 ENGINEERING & CONSTRUCTION
        30,000   Dong-Ah Construction Industrial
                   Co...........................          585,000
                                                  ---------------
                 FOOD PROCESSING
         5,000   Cheil Foods & Chemicals........          326,757
                                                  ---------------
                 INDUSTRIALS
         $ 400K  Kia Precisions Works 0.50% due
                   12/31/09 (Conv.).............          442,000
                                                  ---------------
                 INSURANCE
        10,000   Oriental Fire & Marine
                   Insurance....................          351,418
                                                  ---------------
                 INVESTMENT COMPANIES
         5,000   Atlantis Korean Smaller
                   Co's*........................          217,500
                                                  ---------------
                 MULTI-INDUSTRY
         $ 250 K Kolon International Corp. 1.00%
                   due 12/31/08 (Conv.).........          245,000
                                                  ---------------
                 OIL RELATED
        12,500   Yukong, Ltd. (GDS).............          366,831
                                                  ---------------
                 PHARMACEUTICALS
         $ 800 K Dong-A Pharmaceutical Co., Ltd.
                   3.125% due 12/31/06
                   (Conv.)......................          980,000
                                                  ---------------
                 STEEL & IRON
        35,300   Pohang Iron & Steel, Ltd.
                   (ADR)........................          860,437
                                                  ---------------
                 UTILITIES
        37,000   Korea Electric Power Corp.
                   (ADR)........................          897,250
                                                  ---------------
                 WHOLESALE DISTRIBUTOR
         $ 500 K Daewoo Corp. 0.25% due 12/31/08
                   (Conv.)......................          520,000
                                                  ---------------
                 TOTAL SOUTH KOREA..............        8,480,297
                                                  ---------------
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                             VALUE
- ---------------                                   ---------------
<C>              <S>                              <C>
                 TAIWAN (1.4%)
                 INVESTMENT COMPANIES
            90   Taipei Fund....................  $       765,000
        26,000   Taiwan American Fund
                   (Pref.)*.....................          292,500
                                                  ---------------
                                                        1,057,500
                                                  ---------------
                 TRANSPORTATION
         $ 500K  U-Ming Marine Transport 1.50%
                   due 02/07/01 (Conv.).........          445,000
         $ 504 K Yang Ming Marine Transportation
                   - 144A** 2.00% due 10/06/01
                   (Conv.)......................          630,000
                                                  ---------------
                                                        1,075,000
                                                  ---------------
                 TOTAL TAIWAN...................        2,132,500
                                                  ---------------
                 THAILAND (11.0%)
                 BANKING
       115,000   Bank of Ayudhya PCL............          634,058
        28,750   Bank of Ayudhya PCL
                   (Rights)*....................           84,918
       175,000   First Bangkok City Bank PCL
                   (Alien Market)...............          289,461
       125,000   First Bangkok City Bank PCL
                   (Local Market)...............          206,758
       265,000   Krung Thai Bank PCL............        1,241,927
       950,000   Siam City Bank Ltd.............        1,038,221
        80,000   Siam Commercial Bank Co.,
                   Ltd..........................        1,159,420
       229,200   Thai Military Bank, Ltd........          902,646
                                                  ---------------
                                                        5,557,409
                                                  ---------------
                 BUILDING MATERIALS
        15,000   Siam Cement Co., Ltd...........          736,059
        16,600   Siam City Cement Co., Ltd......          209,200
        90,000   Tipco Asphalt Co., PCL
                   (Alien Market)...............          531,664
        20,000   Tipco Asphalt Co., PCL (Local
                   Market)......................          118,147
        78,750   TPI Polene Co., Ltd............          356,658
                                                  ---------------
                                                        1,951,728
                                                  ---------------
                 CONGLOMERATES
       400,000   Saha-Union PCL.................          626,181
                                                  ---------------
                 ENERGY
        90,000   Cogeneration PCL...............          393,431
                                                  ---------------
                 ENTERTAINMENT
        40,000   Grammy Entertainment PLC.......          554,505
                                                  ---------------
                 FINANCIAL SERVICES
       130,000   Dhana Siam Finance and
                   Securities PCL...............          721,881
        80,000   Krungthai Thanakit PLC.........          356,018
         4,074   SCF Finance & Securities Co.,
                   Ltd..........................            9,546
        13,000   Securities One, Ltd............          119,802
         3,235   Siam City Finance & Securities
                   Co. PLC......................           10,765
                                                  ---------------
                                                        1,218,012
                                                  ---------------
                 FOOD, BEVERAGE, TOBACCO & HOUSEHOLD PRODUCTS
        75,000   Charoen Pokphand Feedmill Co.
                   Ltd..........................          440,099
                                                  ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--PACIFIC GROWTH
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
SHARES/PRINCIPAL
    AMOUNT                                             VALUE
- ---------------                                   ---------------
<C>              <S>                              <C>
                 INVESTMENT COMPANIES
       600,000   Ruang Khao 2 Fund.............  $       301,276
                                                 ---------------
                 METALS & MINING
        35,000   Ban Pu Coal Co., Ltd..........        1,008,979
        56,300   Lanna Lignite PCL
                   (Alien Market)..............          492,226
        20,000   Lanna Lignite PCL
                   (Local Market)..............          174,858
                                                 ---------------
                                                       1,676,063
                                                 ---------------
                 OIL RELATED
        85,000   PTT Exploration & Production
                   PCL.........................        1,245,274
                                                 ---------------
                 TELECOMMUNICATIONS
        18,500   Advanced Information Service
                   PCL
                   (Alien Market)           ...          289,973
        20,000   Advanced Information Service
                   PCL
                   (Local Market)          ....          313,485
        90,000   Total Access Communication
                   PCL.........................          765,000
        40,000   United Communication
                   Industry....................          535,602
                                                 ---------------
                                                       1,904,060
                                                 ---------------
                 TRANSPORTATION
       150,000   Bangkok Expressway Public Co.
                   (Alien Market)..............          246,633
       200,000   Bangkok Expressway Public Co.
                   (Local Market)..............          328,844
       167,400   Thai Airways International
                   Ltd.........................          356,002
                                                 ---------------
                                                         931,479
                                                 ---------------
                 TOTAL THAILAND................       16,799,517
                                                 ---------------
                 TOTAL COMMON AND PREFERRED
                   STOCKS, WARRANTS, RIGHTS AND
                   BONDS (IDENTIFIED COST
                   $137,809,043)...............      146,702,593
                                                 ---------------
</TABLE>
 
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT (IN
 THOUSANDS)                                           VALUE
- ------------                                     ---------------
<C>           <S>                                <C>
              SHORT-TERM INVESTMENTS (A) (4.0%)
              COMMERCIAL PAPER (0.1%)
              AUTOMOTIVE - FINANCE
$        140  Ford Motor Credit Co.
                5.29% due 07/09/96.............  $       139,835
                                                 ---------------
              U.S. GOVERNMENT AGENCY (3.9%)
       6,000  Federal Home Loan Mortgage Corp.
                5.52% due 07/01/96.............        6,000,000
                                                 ---------------
              TOTAL SHORT-TERM INVESTMENTS
                (AMORTIZED COST $6,139,835)....        6,139,835
                                                 ---------------
 
TOTAL INVESTMENTS (IDENTIFIED
  COST $143,948,878) (B).........      100.2%    152,842,428
 
LIABILITIES IN EXCESS OF CASH AND
  OTHER ASSETS...................       (0.2)       (321,505)
                                   ----------  -------------
NET ASSETS.......................      100.0%  $ 152,520,923
                                   ----------  -------------
                                   ----------  -------------
<FN>
- ------------------
ADR  AMERICAN DEPOSITORY RECEIPT.
GDR  GLOBAL DEPOSITORY RECEIPT.
GDS  GLOBAL DEPOSITORY SHARES.
 K   IN THOUSANDS.
 *   NON-INCOME PRODUCING SECURITY.
**   RESALE IS RESTRICTED TO QUALIFIED INSTITUTIONAL INVESTORS.
***  PARTIALLY PAID SHARES. RESALE IS RESTRICTED TO QUALIFIED INSTITUTIONAL
     INVESTORS.
++   CONSISTS OF MORE THAN ONE CLASS OF SECURITIES TRADED TOGETHER AS A UNIT;
     GENERALLY STOCKS WITH ATTACHED WARRANTS.
(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 WAS $15,914,544 AND THE
     AGGREGATE GROSS UNREALIZED DEPRECIATION WAS $7,020,994, RESULTING IN NET
     UNREALIZED APPRECIATION OF $8,893,550.
</TABLE>
 
FORWARD FOREIGN CURRENCY CONTRACTS OPEN AT JUNE 30, 1996:
 
<TABLE>
<CAPTION>
                                                UNREALIZED
   CONTRACTS        IN EXCHANGE     DELIVERY   APPRECIATION
   TO DELIVER           FOR           DATE    (DEPRECIATION)
- ----------------  ----------------  --------  ---------------
<S>  <C>          <C>    <C>        <C>       <C>
$        418,665  IDR    974,023,898 07/01/96 $           90
$        333,128  MYR      830,488  07/01/96            (134)
HKD    1,462,703  $        188,963  07/01/96             (12)
$         45,753  MYR      114,182  07/03/96              30
                                                      ------
                                   Net
unrealized depreciation.....................  $          (26)
                                                      ------
                                                      ------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--PACIFIC GROWTH
SUMMARY OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                             PERCENT OF
INDUSTRY                                          VALUE      NET ASSETS
- ---------------------------------------------  ------------  ----------
<S>                                            <C>           <C>
Aerospace & Defense..........................  $    170,708        0.1%
Agriculture..................................       836,367        0.5
Appliances & Household Durables..............       478,554        0.3
Automotive...................................     5,490,851        3.6
Automotive - Finance.........................       139,835        0.1
Banking......................................    21,589,079       14.2
Banks - Commercial...........................       716,299        0.5
Building & Construction......................     4,759,440        3.1
Building Materials...........................     4,258,883        2.8
Business Services............................     1,009,612        0.7
Chemicals....................................     1,490,006        1.0
Commercial Services..........................     1,056,170        0.7
Communications - Equipment/
 Manufacturers...............................       403,514        0.3
Computer Software & Services.................       396,298        0.3
Computers....................................       255,265        0.2
Computers - Systems..........................        73,334     --
Conglomerates................................     9,472,575        6.1
Construction Plant & Equipment...............     1,045,408        0.7
Data Processing..............................        92,989        0.1
Electrical Equipment.........................        97,730        0.1
Electronic & Electrical Equipment............     3,321,470        2.2
Electronics..................................       511,477        0.3
Energy.......................................       393,431        0.3
Engineering & Construction...................     1,637,278        1.1
Entertainment................................     2,682,415        1.8
Finance......................................       297,696        0.2
Financial Services...........................     4,577,201        3.0
Food Processing..............................       601,298        0.4
Food, Beverage, Tobacco & Household
 Products....................................     3,640,604        2.4
Forest Products, Paper & Packaging...........       682,809        0.5
Health & Personal Care.......................        75,668        0.1
 
<CAPTION>
                                                             PERCENT OF
INDUSTRY                                          VALUE      NET ASSETS
- ---------------------------------------------  ------------  ----------
<S>                                            <C>           <C>
 
Hotels.......................................  $    584,119        0.4%
Hotels/Motels................................       313,997        0.2
Household Furnishings & Appliances...........       100,101        0.1
Industrials..................................       616,401        0.4
Insurance....................................     1,607,312        1.1
Investment Companies.........................     2,527,723        1.7
Leisure......................................       974,620        0.6
Machine Tools................................       167,837        0.1
Machinery....................................     2,354,061        1.4
Manufacturing................................     2,572,178        1.7
Medical Supplies.............................       289,808        0.2
Merchandising................................       107,485        0.1
Metals.......................................     2,075,839        1.4
Metals & Mining..............................     3,025,601        2.0
Multi-Industry...............................     1,486,102        1.0
Natural Gas..................................       204,212        0.1
Oil & Gas Products...........................       433,040        0.3
Oil Related..................................     3,216,038        2.1
Pharmaceuticals..............................     1,409,357        0.9
Photography..................................       408,427        0.3
Plantation...................................       473,637        0.3
Publishing...................................     1,264,262        0.8
Real Estate..................................    18,516,911       12.0
Retail.......................................     1,345,071        0.9
Retail - General Merchandise.................       193,637        0.1
Retail - Specialty...........................       765,314        0.5
Shipbuilding.................................     1,230,060        0.8
Steel & Iron.................................     1,257,459        0.8
Telecommunications...........................    10,970,113        7.2
Textiles.....................................       420,139        0.3
Transportation...............................     6,991,870        4.6
U.S. Government Agency.......................     6,000,000        3.8
Utilities....................................     6,021,392        3.8
Wholesale & International Trade..............        83,143        0.1
Wholesale Distributor........................       580,898        0.4
                                               ------------  ----------
                                               $152,842,428      100.2%
                                               ------------  ----------
                                               ------------  ----------
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                             PERCENT OF
TYPE OF INVESTMENT                                VALUE      NET ASSETS
- ---------------------------------------------  ------------  ----------
<S>                                            <C>           <C>
Common Stocks................................  $141,662,857       92.9%
Convertible Bonds............................     4,055,068        2.7
Preferred Stocks.............................       292,500        0.2
Rights.......................................       518,323        0.3
Short-Term Investment........................     6,139,835        4.0
Warrants.....................................       173,845        0.1
                                               ------------  ----------
                                               $152,842,428      100.2%
                                               ------------  ----------
                                               ------------  ----------
</TABLE>
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--EQUITY
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 NUMBER OF
   SHARES                                              VALUE
- ------------                                      ---------------
<C>           <S>                                 <C>
              COMMON STOCKS (92.0%)
              AEROSPACE (1.3%)
      47,000  Boeing Co.........................  $     4,094,875
      17,300  United Technologies Corp..........        1,989,500
                                                  ---------------
                                                        6,084,375
                                                  ---------------
              AGRICULTURE RELATED (1.8%)
      50,000  Case Corp.........................        2,400,000
      50,000  IMC Global, Inc...................        1,881,250
      35,000  Pioneer Hi-Bred International,
                Inc.............................        1,850,625
      35,000  Potash Corp. of Saskatchewan, Inc.
                (Canada)........................        2,318,750
                                                  ---------------
                                                        8,450,625
                                                  ---------------
              APPAREL & FOOTWEAR (1.4%)
      27,018  Fila Holding SpA (ADR) (Italy)....        2,330,302
      45,100  Jones Apparel Group, Inc.*........        2,215,537
      40,000  Nine West Group, Inc..............        2,045,000
                                                  ---------------
                                                        6,590,839
                                                  ---------------
              AUTO RELATED (1.8%)
      74,900  AutoZone, Inc.*...................        2,602,775
      40,000  Chrysler Corp.....................        2,480,000
      80,000  Harley-Davidson, Inc..............        3,290,000
                                                  ---------------
                                                        8,372,775
                                                  ---------------
              AUTOMOTIVE (0.5%)
      72,000  Ford Motor Co.....................        2,331,000
                                                  ---------------
              BANKS (1.9%)
      60,000  BankAmerica Corp..................        4,545,000
      20,000  Corestates Financial Corp.........          770,000
      10,000  First Bank System, Inc............          580,000
      15,000  Firstar Corp......................          691,875
      24,300  NationsBank Corp..................        2,007,787
                                                  ---------------
                                                        8,594,662
                                                  ---------------
              BANKS - MONEY CENTER (0.7%)
      40,700  Citicorp..........................        3,362,837
                                                  ---------------
              BEVERAGES - ALCOHOLIC (0.5%)
      30,000  Anheuser-Busch Companies,
                Inc.............................        2,250,000
                                                  ---------------
              BEVERAGES - SOFT DRINKS (1.5%)
      60,000  Coca Cola Co......................        2,932,500
     115,000  PepsiCo Inc.......................        4,068,125
                                                  ---------------
                                                        7,000,625
                                                  ---------------
              BIOTECHNOLOGY (2.1%)
       3,100  Aksys, Ltd.*......................           45,725
      20,000  Amgen Inc.*.......................        1,075,000
      19,000  Biochem Pharma, Inc.*.............          710,125
      80,000  Centocor, Inc.*...................        2,390,000
      89,100  Guidant Corp......................        4,388,175
      27,700  Interneuron Pharmaceuticals,
                Inc.*...........................          817,150
         900  SangStat Medical Corp.*...........           15,187
                                                  ---------------
                                                        9,441,362
                                                  ---------------
              BROKERAGE (1.4%)
      40,000  Merrill Lynch & Co., Inc..........        2,605,000
      80,000  Morgan Stanley Group, Inc.........        3,930,000
                                                  ---------------
                                                        6,535,000
                                                  ---------------
 
<CAPTION>
 NUMBER OF
   SHARES                                              VALUE
- ------------                                      ---------------
<C>           <S>                                 <C>
              BUSINESS SYSTEMS (0.1%)
       8,200  Electronic Data Systems Corp......  $       440,750
                                                  ---------------
              CAPITAL GOODS (1.5%)
      40,000  Lockheed Martin Corp..............        3,360,000
      50,600  Raychem Corp......................        3,636,875
                                                  ---------------
                                                        6,996,875
                                                  ---------------
              CHEMICALS (0.9%)
     125,000  Monsanto Co.......................        4,062,500
                                                  ---------------
              COMMUNICATIONS (2.2%)
      60,000  ACT Networks, Inc.*...............        1,935,000
      25,000  Adtran, Inc.*.....................        1,768,750
      50,000  Andrew Corp.*.....................        2,700,000
      30,000  Pairgain Technologies, Inc.*......        1,860,000
      30,000  Premisys Communications,
                Inc.*...........................        1,830,000
                                                  ---------------
                                                       10,093,750
                                                  ---------------
              COMMUNICATIONS - EQUIPMENT & SOFTWARE (1.4%)
     114,000  Cisco Systems, Inc.*..............        6,455,250
                                                  ---------------
              COMMUNICATIONS - SOFTWARE & SERVICES (0.1%)
       8,000  America Online, Inc.*.............          348,000
                                                  ---------------
              COMMUNICATIONS EQUIPMENT (1.2%)
      80,000  Tellabs, Inc.*....................        5,340,000
                                                  ---------------
              COMPUTER SERVICES (3.4%)
      21,000  BDM International Inc.............          971,250
      14,300  Boston Communications Group,
                Inc.............................          232,375
      54,000  Cambridge Technology Partners,
                Inc.*...........................        1,647,000
      19,200  Cognos, Inc.* (Canada)............          436,800
      40,000  Computer Horizons Corp.*..........        1,570,000
       3,900  First USA Paymentech, Inc.........          156,000
      80,000  Gartner Group, Inc. (Class A)*....        2,930,000
      36,000  HNC Software, Inc.................        1,620,000
      30,000  Keane, Inc........................        1,106,250
       3,800  NOVA Corp.*.......................          128,250
       5,200  Renaissance Solutions, Inc.*......          143,000
       7,000  Sapient Corp......................          288,750
       2,600  Siebel Systems, Inc...............           78,000
      88,000  Sterling Commerce, Inc.*..........        3,267,000
      12,500  Transaction Systems Architects,
                Inc. (Class A)..................          837,500
                                                  ---------------
                                                       15,412,175
                                                  ---------------
              COMPUTER SOFTWARE (7.5%)
      22,500  Arbor Software Corp.*.............        1,338,750
      23,000  Atria Software, Inc.*.............        1,150,000
      50,000  Baan Company NV*
                (Netherlands)...................        1,700,000
      25,000  BMC Software, Inc.*...............        1,487,500
      48,500  Business Objects S.A. (ADR)*
                (France)........................        1,952,125
      32,000  Computer Associates International,
                Inc.............................        2,280,000
      50,000  Edify Corp.*......................        1,300,000
      29,900  Forte Software, Inc.*.............        1,562,275
      50,000  Microsoft Corp.*..................        6,000,000
      90,000  Oracle Corp.*.....................        3,543,750
     100,000  Parametric Technology Corp.*......        4,325,000
      30,000  Peoplesoft, Inc.*.................        2,130,000
      21,000  Rational Software Corp.*..........        1,128,750
      22,000  Remedy Corp.*.....................        1,595,000
      41,000  Viasoft, Inc.*....................        2,639,375
                                                  ---------------
                                                       34,132,525
                                                  ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--EQUITY
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 NUMBER OF
   SHARES                                              VALUE
- ------------                                      ---------------
<C>           <S>                                 <C>
              COMPUTER SOFTWARE & SERVICES (0.5%)
      55,000  Citrix Systems, Inc.*.............  $     2,076,250
                                                  ---------------
              CONSUMER BUSINESS SERVICES (5.7%)
      32,600  AccuStaff, Inc.*..................          888,350
      40,000  Apollo Group, Inc. (Class A)*.....        1,100,000
      60,000  CBT Group PLC (ADR)*
                (Ireland).......................        2,700,000
       5,000  Computer Sciences Corp.*..........          373,750
      12,400  CUC International, Inc.*..........          440,200
      52,500  DST Systems, Inc.*................        1,680,000
      40,000  First Data Corp...................        3,185,000
      80,000  Mirage Resorts, Inc.*.............        4,320,000
     146,500  National Education Corp.*.........        2,087,625
      50,000  Reuters Holdings PLC (ADR) (United
                Kingdom)........................        3,618,750
      70,000  Service Corp. International.......        4,025,000
      41,200  Verifone, Inc.....................        1,740,700
                                                  ---------------
                                                       26,159,375
                                                  ---------------
              CONSUMER PRODUCTS (4.5%)
      44,600  Avon Products, Inc................        2,012,575
      60,000  Callaway Golf Co..................        1,995,000
      75,000  Dial Corp.........................        2,146,875
      64,800  Gillette Co.......................        4,041,900
      30,000  Kimberly-Clark Corp...............        2,317,500
      60,000  Kroger Co.*.......................        2,370,000
      30,000  Panamerican Beverages, Inc. (Class
                A) (Mexico).....................        1,342,500
      35,000  Procter & Gamble Co...............        3,171,875
      30,000  Vons Companies, Inc...............        1,121,250
                                                  ---------------
                                                       20,519,475
                                                  ---------------
              DRUGS (2.6%)
      85,000  American Home Products Corp.......        5,110,625
      80,000  IDEC Pharmaceuticals Corp.*.......        1,840,000
      75,000  Lilly (Eli) & Co..................        4,875,000
                                                  ---------------
                                                       11,825,625
                                                  ---------------
              ELECTRIC - MAJOR (0.6%)
      30,000  General Electric Co...............        2,595,000
                                                  ---------------
              ELECTRONICS (0.1%)
       7,000  Intel Corp........................          513,625
                                                  ---------------
              ENERGY (4.8%)
     110,000  Baker Hughes Inc..................        3,616,250
      40,600  BJ Services Co.*..................        1,426,075
      21,000  Chesapeake Energy Corp.*..........        1,887,375
      46,000  Diamond Offshore Drilling, Inc.*..        2,633,500
      78,300  Global Marine, Inc.*..............        1,086,451
      50,000  Halliburton Co....................        2,775,000
      40,000  Marine Drilling Company, Inc.*....          400,000
      75,000  Reading & Bates Corp.*............        1,659,375
      80,000  Rowan Companies, Inc.*............        1,180,000
      31,000  Smith International, Inc.*........          933,875
      70,000  Tidewater, Inc....................        3,071,250
      20,000  Western Atlas, Inc.*..............        1,165,000
                                                  ---------------
                                                       21,834,151
                                                  ---------------
<CAPTION>
 NUMBER OF
   SHARES                                              VALUE
- ------------                                      ---------------
<C>           <S>                                 <C>
              ENTERTAINMENT/GAMING & LODGING (1.7%)
      10,000  Circus Circus Enterprises,
                Inc.*...........................  $       410,000
     100,000  MGM Grand, Inc....................        3,987,500
     114,500  Showboat, Inc.....................        3,449,313
                                                  ---------------
                                                        7,846,813
                                                  ---------------
              FINANCIAL - MISCELLANEOUS (1.3%)
      18,800  Associates First Capital Corp.....          707,350
      20,000  First USA, Inc....................        1,100,000
      47,800  Green Tree Financial Corp.........        1,493,750
      34,960  Household International, Inc......        2,656,960
                                                  ---------------
                                                        5,958,060
                                                  ---------------
              HEALTH MAINTENANCE ORGANIZATIONS (0.6%)
     132,500  Health Management Associates, Inc.
                (Class A)*......................        2,683,125
                                                  ---------------
              HEALTHCARE PRODUCTS & SERVICES (4.0%)
      58,000  HBO & Co..........................        3,915,000
      20,000  Healthsouth Corp.*................          720,000
     113,000  PhyCor, Inc.*.....................        4,265,750
      30,000  Physician Sales & Service,
                Inc.*...........................          727,500
      54,300  Renal Treatment Centers, Inc.*....        1,561,125
      32,000  RoTech Medical Corp.*.............          616,000
      67,000  Shared Medical Systems Corp.......        4,304,750
      12,700  Sunrise Assisted Living, Inc.*....          304,800
      21,900  Total Renal Care Holdings,
                Inc.*...........................          925,275
      24,800  Vivra, Inc.*......................          815,300
                                                  ---------------
                                                       18,155,500
                                                  ---------------
              HOTELS/MOTELS (2.4%)
      56,100  HFS, Inc.*........................        3,927,000
      34,000  Hilton Hotels Corp................        3,825,000
      50,000  ITT Corp.*........................        3,312,500
                                                  ---------------
                                                       11,064,500
                                                  ---------------
              HOUSEHOLD PRODUCTS (0.7%)
      40,000  Colgate-Palmolive Co..............        3,390,000
                                                  ---------------
              HOUSING RELATED (0.5%)
      80,000  Bed Bath & Beyond, Inc.*..........        2,110,000
       4,600  Oakwood Homes Corp................           94,875
                                                  ---------------
                                                        2,204,875
                                                  ---------------
              INSURANCE (2.3%)
      71,000  Allstate Corp. (Note 3)...........        3,239,375
      35,000  American International
                Group, Inc......................        3,451,875
      61,000  Conseco Inc.......................        2,440,000
      26,000  SunAmerica, Inc...................        1,469,000
                                                  ---------------
                                                       10,600,250
                                                  ---------------
              INTERNET (0.5%)
      29,500  Security Dynamics Technologies,
                Inc.*...........................        2,419,000
                                                  ---------------
              MACHINERY - DIVERSIFIED (1.1%)
     120,500  Thermo Electron Corp..............        5,015,813
                                                  ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--EQUITY
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 NUMBER OF
   SHARES                                              VALUE
- ------------                                      ---------------
<C>           <S>                                 <C>
              MEDIA GROUP (2.4%)
      52,900  Clear Channel Communications,
                Inc.*...........................  $     4,357,638
      61,500  Emmis Broadcasting Corp. (Class
                A)*.............................        3,044,250
      30,000  Evergreen Media Corp.
                (Class A)*......................        1,267,500
      71,000  Infinity Broadcasting Corp.*......        2,130,000
       3,000  Lin Television Corp.*.............          106,500
                                                  ---------------
                                                       10,905,888
                                                  ---------------
 
              MEDICAL PRODUCTS & SUPPLIES (1.4%)
      20,400  Becton, Dickinson & Co............        1,637,100
      50,000  IDEXX Laboratories, Inc.*.........        1,950,000
      40,000  Omnicare, Inc.....................        1,060,000
      42,000  Target Therapeutics, Inc.*........        1,711,500
                                                  ---------------
                                                        6,358,600
                                                  ---------------
 
              MEDICAL SUPPLIES (0.1%)
       6,800  Arterial Vascular Engineering,
                Inc.............................          243,100
       4,200  Heartport, Inc.*..................          126,000
                                                  ---------------
                                                          369,100
                                                  ---------------
 
              OFFICE EQUIPMENT & SUPPLIES (0.2%)
      26,000  Corporate Express, Inc.*..........        1,040,000
                                                  ---------------
 
              OIL DRILLING & SERVICES (0.7%)
      40,000  Schlumberger, Ltd.................        3,370,000
                                                  ---------------
 
              PHARMACEUTICALS (2.2%)
     120,000  Johnson & Johnson.................        5,940,000
      60,000  Pfizer, Inc.......................        4,282,500
                                                  ---------------
                                                       10,222,500
                                                  ---------------
 
              RESTAURANTS (0.6%)
      30,000  Cracker Barrel Old Country Store,
                Inc.............................          720,000
      45,300  Landry's Seafood Restaurants,
                Inc.*...........................        1,087,200
      26,000  Starbucks Corp.*..................          731,250
                                                  ---------------
                                                        2,538,450
                                                  ---------------
              RETAIL (3.5%)
      37,300  Dayton-Hudson Corp................        3,846,563
     115,000  Federated Department Stores,
                Inc.*...........................        3,924,375
      19,000  Just For Feet, Inc.*..............        1,007,000
      70,000  Sears, Roebuck & Co...............        3,403,750
      50,000  Tiffany & Co......................        3,650,000
                                                  ---------------
                                                       15,831,688
                                                  ---------------
 
              RETAIL - FOOD CHAINS (0.9%)
     100,000  American Stores Co................        4,125,000
                                                  ---------------
<CAPTION>
 NUMBER OF
   SHARES                                              VALUE
- ------------                                      ---------------
<C>           <S>                                 <C>
              RETAIL - SPECIALTY (1.4%)
      40,000  Home Depot, Inc...................  $     2,160,000
      18,500  Pacific Sunwear of California,
                Inc.*...........................          434,750
      94,600  Price/Costco, Inc.*...............        2,022,075
      50,000  Safeway, Inc......................        1,650,000
       6,000  Urban Outfitters, Inc.*...........          148,500
                                                  ---------------
                                                        6,415,325
                                                  ---------------
              RETAIL - SPECIALTY APPAREL (0.8%)
     120,000  Gap, Inc..........................        3,855,000
                                                  ---------------
              SHOES (0.8%)
      35,000  Nike, Inc. (Class B)..............        3,596,250
                                                  ---------------
              TELECOMMUNICATION EQUIPMENT (0.7%)
      38,000  U.S. Robotics Corp................        3,239,500
                                                  ---------------
              TELECOMMUNICATIONS (6.0%)
      90,000  Ascend Communications, Inc.*......        5,051,250
      70,000  Cascade Communications
                Corp.*..........................        4,760,000
      97,000  MFS Communications Company,
                Inc.*...........................        3,637,500
      47,000  Newbridge Networks Corp.*
                (Canada)........................        3,078,500
       1,000  Premiere Technologies, Inc.*......           30,750
      44,000  Shiva Corp.*......................        3,509,000
      52,000  Stratacom, Inc.*..................        2,925,000
      83,000  WorldCom, Inc.*...................        4,585,750
                                                  ---------------
                                                       27,577,750
                                                  ---------------
              TOBACCO (0.7%)
      30,000  Philip Morris Companies, Inc......        3,120,000
                                                  ---------------
              TRANSPORTATION (2.5%)
      45,000  AMR Corp.*........................        4,095,000
      40,000  Delta Air Lines, Inc..............        3,320,000
      72,000  UAL Corp.*........................        3,870,000
                                                  ---------------
                                                       11,285,000
                                                  ---------------
              TOTAL COMMON STOCKS (IDENTIFIED
                COST $384,744,417)..............      421,007,413
                                                  ---------------
<CAPTION>
 PRINCIPAL
 AMOUNT (IN
 THOUSANDS)
- ------------
<C>           <S>                                 <C>
              U.S. GOVERNMENT OBLIGATION (2.2%)
     $11,200  U.S. Treasury Bond
                6.00% due 02/15/26
                (Identified Cost $9,735,250)....        9,934,750
                                                  ---------------
 
              SHORT-TERM INVESTMENTS (7.2%)
              U.S. GOVERNMENT AGENCIES (A) (5.5%)
       6,000  Federal Farm Credit Bank 5.31% -
                5.45% due 07/01/96 - 07/08/96...       15,090,604
      10,000  Federal Home Loan Mortgage Corp.
                5.26% due 07/03/96..............        9,997,078
                                                  ---------------
              TOTAL U.S. GOVERNMENT AGENCIES
                (AMORTIZED COST $25,087,682)....       25,087,682
                                                  ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--EQUITY
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 PRINCIPAL
 AMOUNT (IN
 THOUSANDS)                                            VALUE
- ------------                                      ---------------
<C>           <S>                                 <C>
              REPURCHASE AGREEMENT (1.7%)
$      7,681  The Bank of New York 5.125% due
                07/01/96 (dated 06/28/96;
                proceeds $7,684,042;
                collateralized by $6,733,862
                U.S. Treasury Note 7.125% due
                09/30/99 valued at $6,997,836
                and $832,161 U.S. Treasury Note
                5.625% due 10/31/97 valued at
                $836,542) (Identified Cost
                $7,680,762).....................  $     7,680,762
                                                  ---------------
              TOTAL SHORT-TERM INVESTMENTS
                (IDENTIFIED COST $32,768,444)...       32,768,444
                                                  ---------------
 
TOTAL INVESTMENTS (IDENTIFIED
  COST $427,248,111) (B).........      101.4%    463,710,607
 
LIABILITIES IN EXCESS OF OTHER
  ASSETS.........................       (1.4)     (6,335,883)
                                   ----------  -------------
 
NET ASSETS.......................      100.0%  $ 457,374,724
                                   ----------  -------------
                                   ----------  -------------
<FN>
- ------------------
ADR  AMERICAN DEPOSITORY RECEIPT.
 *   NON-INCOME PRODUCING SECURITY.
(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 WAS $44,202,556 AND THE
     AGGREGATE GROSS UNREALIZED DEPRECIATION WAS $7,740,060, RESULTING IN NET
     UNREALIZED APPRECIATION OF $36,462,496.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--STRATEGIST
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- -----------                                        ---------------
<C>          <S>                                   <C>
             COMMON STOCKS (67.3%)
             AEROSPACE (1.1%)
    50,000   Boeing Co...........................  $     4,356,250
                                                   ---------------
             AEROSPACE & DEFENSE (2.2%)
    80,000   Honeywell, Inc......................        4,360,000
    24,000   Rockwell International Corp.........        1,374,000
   120,000   Watkins-Johnson Co..................        3,285,000
                                                   ---------------
                                                         9,019,000
                                                   ---------------
             ALUMINUM (0.7%)
    52,000   Aluminum Co. of America.............        2,983,500
                                                   ---------------
             AUTOMOTIVE (2.2%)
   135,000   Ford Motor Co.......................        4,370,625
    87,000   General Motors Corp.................        4,556,625
                                                   ---------------
                                                         8,927,250
                                                   ---------------
             BANKS - MONEY CENTER (1.3%)
    30,000   Citicorp............................        2,478,750
    30,000   Morgan (J.P.) & Co., Inc............        2,538,750
                                                   ---------------
                                                         5,017,500
                                                   ---------------
             BANKS - REGIONAL (0.7%)
    11,000   Wells Fargo & Co....................        2,627,625
                                                   ---------------
             BEVERAGES - SOFT DRINKS (1.2%)
   140,000   PepsiCo Inc.........................        4,952,500
                                                   ---------------
             BROKERAGE (1.3%)
    40,000   Merrill Lynch & Co., Inc............        2,605,000
    50,000   Morgan Stanley Group, Inc...........        2,456,250
                                                   ---------------
                                                         5,061,250
                                                   ---------------
             BUSINESS SYSTEMS (0.8%)
    62,000   Electronic Data Systems Corp........        3,332,500
                                                   ---------------
             CHEMICALS (0.9%)
   108,000   Monsanto Co.........................        3,510,000
                                                   ---------------
             CHEMICALS - SPECIALTY (0.7%)
    90,000   Georgia Gulf Corp...................        2,632,500
                                                   ---------------
             COMMUNICATIONS - EQUIPMENT & SOFTWARE (1.7%)
    87,000   Bay Networks, Inc.*.................        2,240,250
    80,000   Cisco Systems, Inc.*................        4,530,000
                                                   ---------------
                                                         6,770,250
                                                   ---------------
             COMPUTER EQUIPMENT (1.6%)
   140,000   Komag Inc.*.........................        3,657,500
    61,000   Seagate Technology, Inc.*...........        2,745,000
                                                   ---------------
                                                         6,402,500
                                                   ---------------
             COMPUTER SOFTWARE (2.1%)
    34,000   Microsoft Corp.*....................        4,080,000
   111,000   Oracle Corp.*.......................        4,370,625
                                                   ---------------
                                                         8,450,625
                                                   ---------------
             COMPUTERS (1.1%)
   130,000   Gateway 2000, Inc.*.................        4,403,750
                                                   ---------------
             COMPUTERS - SYSTEMS (1.8%)
    38,000   Hewlett-Packard Co..................        3,785,750
    33,200   International Business Machines
               Corp..............................        3,286,800
                                                   ---------------
                                                         7,072,550
                                                   ---------------
 
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- -----------                                        ---------------
<C>          <S>                                   <C>
             DRUGS (2.5%)
    88,000   American Home Products Corp.........  $     5,291,000
    70,000   Lilly (Eli) & Co....................        4,550,000
                                                   ---------------
                                                         9,841,000
                                                   ---------------
             ELECTRIC - MAJOR (1.2%)
    55,000   General Electric Co.................        4,757,500
                                                   ---------------
             ELECTRICAL EQUIPMENT (1.1%)
    50,000   Emerson Electric Co.................        4,518,750
                                                   ---------------
             ENTERTAINMENT (1.2%)
   170,000   Carnival Corp. (Class A)............        4,908,750
                                                   ---------------
             ENTERTAINMENT/GAMING & LODGING (1.4%)
   140,000   Circus Circus Enterprises, Inc.*....        5,740,000
                                                   ---------------
             FINANCIAL - MISCELLANEOUS (0.8%)
    90,000   Federal National Mortgage Assoc.....        3,015,000
                                                   ---------------
             HEALTHCARE - MISCELLANEOUS (3.1%)
   190,000   Humana, Inc.*.......................        3,396,250
    50,000   PacifiCare Health Systems
               (Class B)*........................        3,387,500
   100,000   U.S. Healthcare, Inc................        5,487,500
                                                   ---------------
                                                        12,271,250
                                                   ---------------
             HOSPITAL MANAGEMENT (1.1%)
    86,000   Columbia/HCA Healthcare Corp........        4,590,250
                                                   ---------------
             HOUSEHOLD PRODUCTS (2.4%)
    60,000   Colgate-Palmolive Co................        5,085,000
    50,000   Procter & Gamble Co.................        4,531,250
                                                   ---------------
                                                         9,616,250
                                                   ---------------
             INDUSTRIALS (1.1%)
    75,000   AlliedSignal, Inc...................        4,284,375
                                                   ---------------
             NATURAL GAS (0.8%)
    68,000   Williams Companies, Inc.............        3,366,000
                                                   ---------------
             OFFICE EQUIPMENT & SUPPLIES (1.0%)
    90,000   Alco Standard Corp..................        4,072,500
                                                   ---------------
             OIL - DOMESTIC (0.9%)
    29,000   Atlantic Richfield Co...............        3,436,500
                                                   ---------------
             OIL DRILLING & SERVICES (0.9%)
    40,400   Schlumberger, Ltd...................        3,403,700
                                                   ---------------
             OIL INTEGRATED - INTERNATIONAL (3.5%)
    65,000   Chevron Corp........................        3,835,000
    40,000   Exxon Corp..........................        3,475,000
    29,000   Mobil Corp..........................        3,251,625
    40,000   Texaco, Inc.........................        3,355,000
                                                   ---------------
                                                        13,916,625
                                                   ---------------
             PHARMACEUTICALS (2.5%)
   100,000   Johnson & Johnson...................        4,950,000
    70,000   Pfizer, Inc.........................        4,996,250
                                                   ---------------
                                                         9,946,250
                                                   ---------------
             RAILROADS (1.1%)
    65,000   Conrail, Inc........................        4,314,375
                                                   ---------------
             RETAIL (1.5%)
    56,000   Dayton-Hudson Corp..................        5,775,000
                                                   ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--STRATEGIST
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 NUMBER OF
  SHARES                                                VALUE
- -----------                                        ---------------
<C>          <S>                                   <C>
             RETAIL - SPECIALTY (3.0%)
    95,000   Home Depot, Inc.....................  $     5,130,000
   155,000   Payless ShoeSource, Inc.*...........        4,921,250
    81,700   Price/Costco, Inc.*.................        1,746,338
                                                   ---------------
                                                        11,797,588
                                                   ---------------
             RETAIL - SPECIALTY APPAREL (1.3%)
   166,000   Gap, Inc............................        5,332,750
                                                   ---------------
             SAVINGS & LOAN ASSOCIATIONS (1.9%)
   150,000   California Federal Bank*............        2,737,500
    50,000   Golden West Financial Corp..........        2,800,000
   100,000   Roosevelt Financial Group, Inc......        1,925,000
                                                   ---------------
                                                         7,462,500
                                                   ---------------
             SHOES (1.5%)
    57,000   Nike, Inc. (Class B)................        5,856,750
                                                   ---------------
             STEEL & IRON (1.4%)
   246,000   Bethlehem Steel Corp.*..............        2,921,250
   133,000   Inland Steel Industries, Inc........        2,610,125
                                                   ---------------
                                                         5,531,375
                                                   ---------------
             TELECOMMUNICATIONS (0.8%)
    73,000   GTE Corp............................        3,266,750
                                                   ---------------
             TOBACCO (1.8%)
   100,000   Dimon, Inc..........................        1,850,000
    50,000   Philip Morris Companies, Inc........        5,200,000
                                                   ---------------
                                                         7,050,000
                                                   ---------------
             UTILITIES - ELECTRIC (5.1%)
   120,000   Baltimore Gas & Electric Co.........        3,405,000
   110,000   CINergy Corp........................        3,520,000
   110,000   Consolidated Edison Company of New
               York, Inc.........................        3,217,500
    95,000   Florida Progress Corp...............        3,301,250
   100,000   General Public Utilities Corp.......        3,525,000
   120,000   Kansas City Power & Light Co........        3,300,000
                                                   ---------------
                                                        20,268,750
                                                   ---------------
             UTILITIES - GAS (1.0%)
   130,000   Pacific Enterprises.................        3,851,250
                                                   ---------------
             TOTAL COMMON STOCKS (IDENTIFIED COST
               $240,712,504).....................      267,711,338
                                                   ---------------
</TABLE>
<TABLE>
<CAPTION>
 PRINCIPAL
AMOUNT (IN
THOUSANDS)
- -----------
<C>          <S>                                   <C>
             CORPORATE BONDS (12.9%)
             BANKS (1.9%)
 $   2,100   Banque Paribas of New York 8.35% due
               06/15/07..........................        2,184,126
     1,000   First National Bank Corp.
               7.32% due 12/01/10................          940,860
     2,160   First Nationwide Bank
               10.00% due 10/01/06...............        2,430,540
     2,000   First USA Bank
               5.85% due 02/22/01................        1,893,540
                                                   ---------------
                                                         7,449,066
                                                   ---------------
             BROADCAST MEDIA (0.6%)
     2,000   Time Warner, Inc.
               9.625% due 05/01/02...............        2,200,140
                                                   ---------------
 
<CAPTION>
 PRINCIPAL
AMOUNT (IN
THOUSANDS)                                              VALUE
- -----------                                        ---------------
<C>          <S>                                   <C>
             BROKERAGE (0.5%)
 $   2,000   Lehman Brothers Holdings Inc. 8.05%
               due 01/15/19......................  $     2,086,100
                                                   ---------------
             CABLE TELEVISION EQUIPMENT (0.5%)
     2,000   Continental Cablevision, Inc. 8.875%
               due 09/15/05......................        2,147,160
                                                   ---------------
             FINANCE (0.6%)
     2,000   Terra Nova Holdings 10.75% due
               07/01/05 (United Kingdom).........        2,246,840
                                                   ---------------
             FINANCIAL (2.4%)
     1,000   Arkwright CSN Trust - 144A** 9.625%
               due 08/15/26......................        1,028,750
     2,000   Commercial Credit Co.
               10.00% due 05/15/09...............        2,408,120
     1,200   General Motors Acceptance Corp.
               5.70% due 12/22/97................        1,190,088
     2,000   RHG Finance Corp.
               8.875% due 10/01/05...............        2,070,380
     3,000   Sun Canada Financial Co. - 144A**
               6.625% due 12/15/07...............        2,808,750
                                                   ---------------
                                                         9,506,088
                                                   ---------------
             FINANCIAL SERVICES (1.1%)
     2,000   Conseco, Inc.
               10.50% due 12/15/04...............        2,287,060
     2,000   Lumbermens Mutual Casualty - 144A**
               9.15% due 07/01/26................        2,072,500
                                                   ---------------
                                                         4,359,560
                                                   ---------------
             FOREIGN GOVERNMENT AGENCY (1.0%)
     2,000   Finland (Republic of)
               5.875% due 02/27/06...............        1,830,000
     2,000   Quebec Province 8.625% due 12/01/26
               (Canada)..........................        2,162,960
                                                   ---------------
                                                         3,992,960
                                                   ---------------
             HOSPITAL MANAGEMENT (0.5%)
     2,000   Columbia/HCA Healthcare Corp. 7.50%
               due 11/15/95......................        1,900,000
                                                   ---------------
             INDUSTRIALS (2.8%)
     2,000   Harcourt General, Inc.
               8.875% due 06/01/22...............        2,177,740
     2,000   News America Holdings, Inc. 7.90%
               due 12/01/95......................        1,802,500
     2,000   Pennzoil Co.
               10.125% due 11/15/09..............        2,359,580
     1,950   Philips Electronics NV 7.20% due
               06/01/26 (Netherlands)............        1,933,737
     2,000   Reliance Industries PLC
               9.375% due 06/24/26 (India).......        2,045,000
     1,000   Tosco Corp. 7.625% due 05/15/06.....        1,000,320
                                                   ---------------
                                                        11,318,877
                                                   ---------------
             TELECOMMUNICATIONS (0.5%)
     2,000   Tele-Communications, Inc.
               9.80% due 02/01/12................        2,154,800
                                                   ---------------
             UTILITIES - ELECTRIC (0.5%)
     2,000   Niagara Mohawk Power Corp. 9.25% due
               10/01/01..........................        1,974,660
                                                   ---------------
             TOTAL CORPORATE BONDS (IDENTIFIED
               COST $51,560,267).................       51,336,251
                                                   ---------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES--STRATEGIST
PORTFOLIO OF INVESTMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 PRINCIPAL
AMOUNT (IN
THOUSANDS)                                              VALUE
- -----------                                        ---------------
<C>          <S>                                   <C>
 
             U.S. GOVERNMENT OBLIGATIONS (12.7%)
 $   3,000   U.S. Treasury Bond
               7.625% due 02/15/25...............  $     3,232,031
     1,500   U.S. Treasury Bond
               6.875% due 08/15/25...............        1,485,234
     3,000   U.S. Treasury Note
               5.75% due 09/30/97................        2,993,438
     2,000   U.S. Treasury Note
               6.375% due 05/15/99...............        2,004,375
     2,000   U.S. Treasury Note
               6.875% due 08/31/99...............        2,028,438
    12,000   U.S. Treasury Note
               7.75% due 12/31/99................       12,504,375
     7,000   U.S. Treasury Note
               6.875% due 03/31/00...............        7,103,906
    11,000   U.S. Treasury Note
               5.625% due 11/30/00...............       10,652,812
     2,000   U.S. Treasury Note
               6.375% due 08/15/02...............        1,984,063
     6,000   U.S. Treasury Note
               5.75% due 08/15/03................        5,708,437
     1,000   U.S. Treasury Note
               7.25% due 05/15/04................        1,035,625
                                                   ---------------
             TOTAL U.S. GOVERNMENT OBLIGATIONS
               (IDENTIFIED COST $52,720,933).....       50,732,734
                                                   ---------------
<CAPTION>
 PRINCIPAL
AMOUNT (IN
THOUSANDS)                                              VALUE
- -----------                                        ---------------
<C>          <S>                                   <C>
 
             SHORT-TERM INVESTMENTS (A) (6.4%)
             U.S. GOVERNMENT AGENCIES
 $  12,000   Federal Home Loan Banks
               5.26% due 07/08/96................  $    11,987,727
    13,600   Federal Home Loan Mortgage Corp.
               5.24% - 5.52% due 07/01/96 -
               07/03/96..........................       13,597,671
                                                   ---------------
             TOTAL SHORT-TERM INVESTMENTS
               (AMORTIZED COST $25,585,398)......       25,585,398
                                                   ---------------
 
TOTAL INVESTMENTS (IDENTIFIED
  COST $370,579,102) (B).........       99.3%    395,365,721
 
CASH AND OTHER ASSETS IN EXCESS
  OF LIABILITIES.................        0.7       2,841,940
                                   ----------  -------------
 
NET ASSETS.......................      100.0%  $ 398,207,661
                                   ----------  -------------
                                   ----------  -------------
<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 WAS $33,852,765 AND THE
     AGGREGATE GROSS UNREALIZED DEPRECIATION WAS $9,066,146, RESULTING IN NET
     UNREALIZED APPRECIATION OF $24,786,619.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
STATEMENTS OF ASSETS AND LIABILITIES JUNE 30, 1996 (UNAUDITED)
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                            QUALITY
                                      MONEY MARKET        INCOME PLUS          HIGH YIELD          UTILITIES
                                      ------------        ------------        ------------        ------------
<S>                                   <C>                 <C>                 <C>                 <C>
ASSETS:
Investments in securities, at
  value *.....................        $286,283,720        $459,767,262        $202,415,882        $461,325,238
Cash..........................               6,962             --                   20,783             --
Receivable for:
  Investments sold............             --               35,129,689             --                2,649,580
  Shares of beneficial
    interest sold.............             448,552                 575             317,894              20,582
  Dividends...................             --                  --                  --                1,422,620
  Interest....................             446,928           6,723,835           4,256,990             741,318
  Foreign withholding taxes
    reclaimed.................             --                  --                  --                  --
Prepaid expenses and other
  assets......................               1,625               2,984               2,200               4,310
                                      ------------        ------------        ------------        ------------
        TOTAL ASSETS..........         287,187,787         501,624,345         207,013,749         466,163,648
                                      ------------        ------------        ------------        ------------
LIABILITIES:
Payable for:
  Investments purchased.......             --               31,152,285           5,285,757           1,045,717
  Shares of beneficial
    interest repurchased......             876,381              77,933             581,731             182,072
  Investment management fee...             109,555             190,645              80,273             242,409
Accrued expenses and other
  payables....................              47,453             103,794              50,081              53,401
Commitments (Note 6)..........             --                  --                  --                  --
                                      ------------        ------------        ------------        ------------
        TOTAL LIABILITIES.....           1,033,389          31,524,657           5,997,842           1,523,599
                                      ------------        ------------        ------------        ------------
NET ASSETS:
Paid-in-capital...............         286,154,132         496,698,982         293,619,800         390,108,701
Accumulated undistributed net
  investment income
  (distributions in excess of
  net investment income)......                 266             178,873             128,973              28,186
Accumulated undistributed net
  realized gain (accumulated
  net realized loss)..........             --              (30,707,683)        (76,898,603)            366,212
Net unrealized appreciation
  (depreciation)..............             --                3,929,516         (15,834,263)         74,136,950
                                      ------------        ------------        ------------        ------------
        NET ASSETS............        $286,154,398        $470,099,688        $201,015,907        $464,640,049
                                      ------------        ------------        ------------        ------------
                                      ------------        ------------        ------------        ------------
*IDENTIFIED COST..............        $286,283,720        $455,837,746        $218,250,145        $387,188,288
                                      ------------        ------------        ------------        ------------
                                      ------------        ------------        ------------        ------------
SHARES OF BENEFICIAL INTEREST
  OUTSTANDING.................         286,154,132          46,171,051          32,093,616          30,968,699
                                      ------------        ------------        ------------        ------------
                                      ------------        ------------        ------------        ------------
NET ASSET VALUE PER
  SHARE (unlimited authorized
  shares of $.01 par value)...               $1.00              $10.18               $6.26              $15.00
                                      ------------        ------------        ------------        ------------
                                      ------------        ------------        ------------        ------------
<FN>
- ------------------
** Includes foreign cash of $1,401,554 and $933,883,
respectively.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
<PAGE>
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                                GLOBAL
                                        DIVIDEND            CAPITAL            DIVIDEND            EUROPEAN            PACIFIC
                                         GROWTH             GROWTH              GROWTH              GROWTH              GROWTH
                                      ------------        -----------        ------------        ------------        ------------
<S>                                   <C>                 <C>                <C>                 <C>                 <C>
ASSETS:
Investments in securities, at
  value *.....................        $1,050,173,506      $80,281,631        $271,575,052        $231,709,297        $152,842,428
Cash..........................              18,198            --                1,852,731           4,154,916**         1,711,117**
Receivable for:
  Investments sold............           2,986,475          1,057,899             721,280           1,261,694             929,566
  Shares of beneficial
    interest sold.............           1,064,865             64,632             354,247             195,133             156,167
  Dividends...................           1,712,764             45,185             887,732             311,046             231,378
  Interest....................             880,850            --                   10,547               6,225              33,579
  Foreign withholding taxes
    reclaimed.................             --                 --                  352,290             371,517             --
Prepaid expenses and other
  assets......................               2,229              1,150               1,311               1,698              13,664
                                      ------------        -----------        ------------        ------------        ------------
        TOTAL ASSETS..........        1,056,838,887        81,450,497         275,755,190         238,011,526         155,917,899
                                      ------------        -----------        ------------        ------------        ------------
LIABILITIES:
Payable for:
  Investments purchased.......           6,508,863            535,980           2,942,150           3,580,749           3,182,041
  Shares of beneficial
    interest repurchased......                 484             25,449                 247               9,922             --
  Investment management fee...             477,639             42,638             164,534             188,274             123,524
Accrued expenses and other
  payables....................              67,576             31,406              70,332              43,055              91,411
Commitments (Note 6)..........             --                 --                  --                  --                  --
                                      ------------        -----------        ------------        ------------        ------------
        TOTAL LIABILITIES.....           7,054,562            635,473           3,177,263           3,822,000           3,396,976
                                      ------------        -----------        ------------        ------------        ------------
NET ASSETS:
Paid-in-capital...............         775,069,002         59,924,896         230,684,738         164,152,804         145,167,907
Accumulated undistributed net
  investment income
  (distributions in excess of
  net investment income)......             (17,356)           326,563             (11,773)          1,532,424           2,411,337
Accumulated undistributed net
  realized gain (accumulated
  net realized loss)..........          71,060,428          5,679,284          12,955,669          22,273,171          (3,949,780)
Net unrealized appreciation
  (depreciation)..............         203,672,251         14,884,281          28,949,293          46,231,127           8,891,459
                                      ------------        -----------        ------------        ------------        ------------
        NET ASSETS............        $1,049,784,325      $80,815,024        $272,577,927        $234,189,526        $152,520,923
                                      ------------        -----------        ------------        ------------        ------------
                                      ------------        -----------        ------------        ------------        ------------
*IDENTIFIED COST..............        $846,501,255        $65,397,350        $242,632,323        $185,460,443        $143,948,878
                                      ------------        -----------        ------------        ------------        ------------
                                      ------------        -----------        ------------        ------------        ------------
SHARES OF BENEFICIAL INTEREST
  OUTSTANDING.................          61,834,560          4,884,676          21,791,981          11,768,699          14,697,839
                                      ------------        -----------        ------------        ------------        ------------
                                      ------------        -----------        ------------        ------------        ------------
NET ASSET VALUE PER
  SHARE (unlimited authorized
  shares of $.01 par value)...              $16.98             $16.54              $12.51              $19.90              $10.38
                                      ------------        -----------        ------------        ------------        ------------
                                      ------------        -----------        ------------        ------------        ------------
 
<CAPTION>
 
                                  EQUITY           STRATEGIST
                                -----------        -----------
<S>                                   <C>          <C>
ASSETS:
Investments in securities, at
  value *.....................  $463,710,607       $395,365,721
Cash..........................      --                  13,956
Receivable for:
  Investments sold............   10,681,292            --
  Shares of beneficial
    interest sold.............      615,005          1,011,553
  Dividends...................      189,373            196,630
  Interest....................      255,110          1,839,245
  Foreign withholding taxes
    reclaimed.................      --                 --
Prepaid expenses and other
  assets......................        2,989              3,006
                                -----------        -----------
        TOTAL ASSETS..........  475,454,376        398,430,111
                                -----------        -----------
LIABILITIES:
Payable for:
  Investments purchased.......   17,840,520            --
  Shares of beneficial
    interest repurchased......      --                   1,337
  Investment management fee...      186,360            162,896
Accrued expenses and other
  payables....................       52,772             58,217
Commitments (Note 6)..........      --                 --
                                -----------        -----------
        TOTAL LIABILITIES.....   18,079,652            222,450
                                -----------        -----------
NET ASSETS:
Paid-in-capital...............  335,166,977        368,261,009
Accumulated undistributed net
  investment income
  (distributions in excess of
  net investment income)......          162             45,711
Accumulated undistributed net
  realized gain (accumulated
  net realized loss)..........   85,745,089          5,114,322
Net unrealized appreciation
  (depreciation)..............   36,462,496         24,786,619
                                -----------        -----------
        NET ASSETS............  $457,374,724       $398,207,661
                                -----------        -----------
                                -----------        -----------
*IDENTIFIED COST..............  $427,248,111       $370,579,102
                                -----------        -----------
                                -----------        -----------
SHARES OF BENEFICIAL INTEREST
  OUTSTANDING.................   15,597,874         30,719,360
                                -----------        -----------
                                -----------        -----------
NET ASSET VALUE PER
  SHARE (unlimited authorized
  shares of $.01 par value)...       $29.32             $12.96
                                -----------        -----------
                                -----------        -----------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
STATEMENTS OF OPERATIONS FOR THE SIX MONTHS ENDED JUNE 30, 1996 (UNAUDITED)
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                  QUALITY
                                MONEY MARKET    INCOME PLUS    HIGH YIELD      UTILITIES
                                -------------  -------------  -------------  -------------
<S>                             <C>            <C>            <C>            <C>
INVESTMENT INCOME:
  INCOME
    Interest..................  $   7,330,278  $  17,835,547  $  11,426,035  $   2,182,674
    Dividends.................       --             --             --            7,993,139**
                                -------------  -------------  -------------  -------------
        TOTAL INCOME..........      7,330,278     17,835,547     11,426,035     10,175,813
                                -------------  -------------  -------------  -------------
  EXPENSES
    Investment management
      fee.....................        671,944      1,220,354        437,887      1,525,455
    Transfer agent fees and
      expenses................            750            750            750            750
    Shareholder reports and
      notices.................          5,320         15,010          1,622         11,180
    Professional fees.........         15,062         20,771            237         14,423
    Trustees' fees and
      expenses................            724          2,402            377          1,152
    Custodian fees............         11,446         61,078          9,078         15,281
    Other.....................          9,186         11,807       --                3,927
                                -------------  -------------  -------------  -------------
        TOTAL EXPENSES........        714,432      1,332,172        449,951      1,572,168
                                -------------  -------------  -------------  -------------
            NET INVESTMENT
              INCOME..........      6,615,846     16,503,375     10,976,084      8,603,645
                                -------------  -------------  -------------  -------------
NET REALIZED AND UNREALIZED
  GAIN (LOSS):
    Net realized gain (loss)
      on:
      Investments.............       --           (5,856,072)    (2,785,453)      (780,369)
      Foreign exchange
        transactions..........       --             --             --             --
                                -------------  -------------  -------------  -------------
        TOTAL GAIN (LOSS).....       --           (5,856,072)    (2,785,453)      (780,369)
                                -------------  -------------  -------------  -------------
    Net change in unrealized
     appreciation/depreciation
      on:
      Investments (Note 3)....       --          (30,650,839)     2,787,811     10,444,595
      Translation of forward
        foreign currency
        contracts, other
        assets and liabilities
        denominated in foreign
        currencies............       --             --             --             --
                                -------------  -------------  -------------  -------------
        TOTAL APPRECIATION
          (DEPRECIATION)......       --          (30,650,839)     2,787,811     10,444,595
                                -------------  -------------  -------------  -------------
        NET GAIN (LOSS).......       --          (36,506,911)         2,358      9,664,226
                                -------------  -------------  -------------  -------------
            NET INCREASE
              (DECREASE)......  $   6,615,846  $ (20,003,536) $  10,978,442  $  18,267,871
                                -------------  -------------  -------------  -------------
                                -------------  -------------  -------------  -------------
<FN>
- ------------------
  *    Net of $1,762 foreign witholding tax.
  **    Net of $80,929, $65,442, $564, $413,121, $424,845,
        $136,931 and $6,022 foreign witholding tax,
        respectively.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
<PAGE>
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                            GLOBAL
                                  DIVIDEND     CAPITAL     DIVIDEND      EUROPEAN        PACIFIC
                                   GROWTH      GROWTH       GROWTH        GROWTH         GROWTH       EQUITY     STRATEGIST
                                ------------  ---------  ------------  -------------  -------------  ---------   ---------
<S>                             <C>           <C>        <C>           <C>            <C>            <C>         <C>
INVESTMENT INCOME:
  INCOME
    Interest..................  $  1,393,760  $  55,595  $    100,770  $     270,111  $     215,832* $ 846,442   $3,875,977
    Dividends.................    13,465,159**   399,917**    3,802,410**     2,563,996**     1,470,699** 1,507,192** 2,955,307
                                ------------  ---------  ------------  -------------  -------------  ---------   ---------
        TOTAL INCOME..........    14,858,919    455,512     3,903,180      2,834,107      1,686,531  2,353,634   6,831,284
                                ------------  ---------  ------------  -------------  -------------  ---------   ---------
  EXPENSES
    Investment management
      fee.....................     2,723,506    239,087       885,363      1,033,606        663,551  1,007,084     977,563
    Transfer agent fees and
      expenses................           750        750           750            750            750        750         750
    Shareholder reports and
      notices.................        15,794        940         3,351          4,098          4,246      9,635       4,096
    Professional fees.........        14,818     12,612        16,212         18,677         20,125     11,782      14,088
    Trustees' fees and
      expenses................         2,398        218           923            587            668      1,358       2,457
    Custodian fees............        26,983      7,273        88,686         29,823        143,006     67,950      27,516
    Other.....................         6,731         49         4,716          3,425          6,305        216       4,026
                                ------------  ---------  ------------  -------------  -------------  ---------   ---------
        TOTAL EXPENSES........     2,790,980    260,929     1,000,001      1,090,966        838,651  1,098,775   1,030,496
                                ------------  ---------  ------------  -------------  -------------  ---------   ---------
            NET INVESTMENT
              INCOME..........    12,067,939    194,583     2,903,179      1,743,141        847,880  1,254,859   5,800,788
                                ------------  ---------  ------------  -------------  -------------  ---------   ---------
NET REALIZED AND UNREALIZED
  GAIN (LOSS):
    Net realized gain (loss)
      on:
      Investments.............    47,469,626  4,979,853     6,942,451     10,255,451        840,690  31,141,960  1,571,948
      Foreign exchange
        transactions..........       --          --           (23,286)       673,828         (7,624)    --          --
                                ------------  ---------  ------------  -------------  -------------  ---------   ---------
        TOTAL GAIN (LOSS).....    47,469,626  4,979,853     6,919,165     10,929,279        833,066  31,141,960  1,571,948
                                ------------  ---------  ------------  -------------  -------------  ---------   ---------
    Net change in unrealized
     appreciation/depreciation
      on:
      Investments (Note 3)....    31,225,445    674,947     8,654,123     13,658,062      5,235,939   (642,072)  14,376,253
      Translation of forward
        foreign currency
        contracts, other
        assets and liabilities
        denominated in foreign
        currencies............       --          --             6,813       (133,592)          (832)    --          --
                                ------------  ---------  ------------  -------------  -------------  ---------   ---------
        TOTAL APPRECIATION
          (DEPRECIATION)......    31,225,445    674,947     8,660,936     13,524,470      5,235,107   (642,072)  14,376,253
                                ------------  ---------  ------------  -------------  -------------  ---------   ---------
        NET GAIN (LOSS).......    78,695,071  5,654,800    15,580,101     24,453,749      6,068,173  30,499,888  15,948,201
                                ------------  ---------  ------------  -------------  -------------  ---------   ---------
            NET INCREASE
              (DECREASE)......  $ 90,763,010  $5,849,383 $ 18,483,280  $  26,196,890  $   6,916,053  $31,754,747 $21,748,989
                                ------------  ---------  ------------  -------------  -------------  ---------   ---------
                                ------------  ---------  ------------  -------------  -------------  ---------   ---------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
STATEMENTS OF CHANGES IN NET ASSETS
- --------------------------------------------------------------------------------
 
FOR THE SIX MONTHS ENDED JUNE 30, 1996 (UNAUDITED) AND FOR THE YEAR ENDED
DECEMBER 31, 1995
 
<TABLE>
<CAPTION>
                                       MONEY MARKET              QUALITY INCOME PLUS
                                ---------------------------  ---------------------------
                                    1996           1995          1996           1995
                                -------------  ------------  -------------  ------------
<S>                             <C>            <C>           <C>            <C>
INCREASE (DECREASE) IN NET
  ASSETS:
  Operations:
    Net investment income.....  $   6,615,846  $ 13,741,500  $  16,503,375  $ 32,845,926
    Net realized gain
      (loss)..................       --             --          (5,856,072)   14,651,610
    Net change in unrealized
   appreciation/depreciation..       --             --         (30,650,839)   53,023,332
                                -------------  ------------  -------------  ------------
        Net increase
          (decrease)..........      6,615,846    13,741,500    (20,003,536)  100,520,868
                                -------------  ------------  -------------  ------------
  Dividends and distributions
    from:
    Net investment income.....     (6,615,602)  (13,741,498)   (16,932,668)  (32,322,904)
    Net realized gain.........       --             --            --             --
    In excess of net
      investment income.......       --             --            --             --
                                -------------  ------------  -------------  ------------
        Total.................     (6,615,602)  (13,741,498)   (16,932,668)  (32,322,904)
                                -------------  ------------  -------------  ------------
  Transactions in shares of
    beneficial interest:
    Net proceeds from sales...    102,208,271    96,881,194     11,226,263    36,146,570
    Reinvestment of dividends
      and distributions.......      6,615,602    13,741,498     16,932,668    32,322,904
    Cost of shares
      repurchased.............    (72,456,305) (129,460,561)   (41,701,594)  (30,993,795)
                                -------------  ------------  -------------  ------------
        Net increase
          (decrease)..........     36,367,568   (18,837,869)   (13,542,663)   37,475,679
                                -------------  ------------  -------------  ------------
        Total increase
          (decrease)..........     36,367,812   (18,837,867)   (50,478,867)  105,673,643
NET ASSETS:
  Beginning of period.........    249,786,586   268,624,453    520,578,555   414,904,912
                                -------------  ------------  -------------  ------------
  END OF PERIOD...............  $ 286,154,398  $249,786,586  $ 470,099,688  $520,578,555
                                -------------  ------------  -------------  ------------
                                -------------  ------------  -------------  ------------
Undistributed Net Investment
  Income
  (Distributions In Excess of
  Net Investment Income)......  $         266  $         22  $     178,873  $    608,166
                                -------------  ------------  -------------  ------------
                                -------------  ------------  -------------  ------------
SHARES ISSUED AND REPURCHASED:
  Sold........................    102,208,271    96,881,194      1,058,957     3,515,633
  Issued in reinvestment of
    dividends and
    distributions.............      6,615,602    13,741,498      1,632,299     3,154,028
  Repurchased.................    (72,456,305) (129,460,561)    (4,032,954)   (3,077,582)
                                -------------  ------------  -------------  ------------
  Net increase (decrease).....     36,367,568   (18,837,869)    (1,341,698)    3,592,079
                                -------------  ------------  -------------  ------------
                                -------------  ------------  -------------  ------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
<PAGE>
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                        HIGH YIELD                    UTILITIES                DIVIDEND GROWTH
                                ---------------------------  ---------------------------  --------------------------
                                    1996           1995          1996           1995          1996          1995
                                -------------  ------------  -------------  ------------  ------------  ------------
<S>                             <C>            <C>           <C>            <C>           <C>           <C>
INCREASE (DECREASE) IN NET
  ASSETS:
  Operations:
    Net investment income.....  $  10,976,084  $ 17,067,326  $   8,603,645  $ 16,939,135  $ 12,067,939  $ 19,552,389
    Net realized gain
      (loss)..................     (2,785,453)   (1,098,358)      (780,369)    3,776,681    47,469,626    25,514,561
    Net change in unrealized
   appreciation/depreciation..      2,787,811     2,521,011     10,444,595    86,839,183    31,225,445   170,908,947
                                -------------  ------------  -------------  ------------  ------------  ------------
        Net increase
          (decrease)..........     10,978,442    18,489,979     18,267,871   107,554,999    90,763,010   215,975,897
                                -------------  ------------  -------------  ------------  ------------  ------------
  Dividends and distributions
    from:
    Net investment income.....    (11,341,501)  (16,648,733)    (8,580,880)  (18,544,715)  (12,102,509)  (20,821,765)
    Net realized gain.........       --             --            --             --            --        (12,652,636)
    In excess of net
      investment income.......       --             --            --             --            --            --
                                -------------  ------------  -------------  ------------  ------------  ------------
        Total.................    (11,341,501)  (16,648,733)    (8,580,880)  (18,544,715)  (12,102,509)  (33,474,401)
                                -------------  ------------  -------------  ------------  ------------  ------------
  Transactions in shares of
    beneficial interest:
    Net proceeds from sales...     46,036,537    36,566,043      8,023,394    25,533,783   104,184,809   101,006,743
    Reinvestment of dividends
      and distributions.......     11,341,501    16,648,733      8,580,880    18,544,715    12,102,509    33,474,401
    Cost of shares
      repurchased.............    (10,308,657)  (12,680,679)   (40,721,361)  (36,430,389)  (10,580,320)  (24,518,137)
                                -------------  ------------  -------------  ------------  ------------  ------------
        Net increase
          (decrease)..........     47,069,381    40,534,097    (24,117,087)    7,648,109   105,706,998   109,963,007
                                -------------  ------------  -------------  ------------  ------------  ------------
        Total increase
          (decrease)..........     46,706,322    42,375,343    (14,430,096)   96,658,393   184,367,499   292,464,503
NET ASSETS:
  Beginning of period.........    154,309,585   111,934,242    479,070,145   382,411,752   865,416,826   572,952,323
                                -------------  ------------  -------------  ------------  ------------  ------------
  END OF PERIOD...............  $ 201,015,907  $154,309,585  $ 464,640,049  $479,070,145  $1,049,784,325 $865,416,826
                                -------------  ------------  -------------  ------------  ------------  ------------
                                -------------  ------------  -------------  ------------  ------------  ------------
Undistributed Net Investment
  Income
  (Distributions In Excess of
  Net Investment Income)......  $     128,973  $    494,390  $      28,186  $      5,421  $    (17,356) $     17,214
                                -------------  ------------  -------------  ------------  ------------  ------------
                                -------------  ------------  -------------  ------------  ------------  ------------
SHARES ISSUED AND REPURCHASED:
  Sold........................      7,292,628     5,834,627        540,923     1,947,513     6,248,221     7,140,373
  Issued in reinvestment of
    dividends and
    distributions.............      1,806,051     2,658,293        577,515     1,407,989       717,828     2,413,931
  Repurchased.................     (1,636,715)   (2,029,027)    (2,773,498)   (2,821,228)     (636,942)   (1,815,800)
                                -------------  ------------  -------------  ------------  ------------  ------------
  Net increase (decrease).....      7,461,964     6,463,893     (1,655,060)      534,274     6,329,107     7,738,504
                                -------------  ------------  -------------  ------------  ------------  ------------
                                -------------  ------------  -------------  ------------  ------------  ------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
STATEMENTS OF CHANGES IN NET ASSETS (CONTINUED)
- --------------------------------------------------------------------------------
 
FOR THE SIX MONTHS ENDED JUNE 30, 1996 (UNAUDITED) AND FOR THE YEAR ENDED
DECEMBER 31, 1995
 
<TABLE>
<CAPTION>
                                    CAPITAL GROWTH         GLOBAL DIVIDEND GROWTH
                                ----------------------   ---------------------------
                                   1996        1995          1996           1995
                                -----------  ---------   -------------  ------------
<S>                             <C>          <C>         <C>            <C>
INCREASE (DECREASE) IN NET
  ASSETS:
  Operations:
    Net investment income.....  $   194,583    3$87,427  $   2,903,179  $  3,729,139
    Net realized gain
      (loss)..................    4,979,853  2,153,798       6,919,165     6,300,237
    Net change in unrealized
  appreciation/depreciation...      674,947  13,237,372      8,660,936    23,341,679
                                -----------  ---------   -------------  ------------
        Net increase
          (decrease)..........    5,849,383  15,778,597     18,483,280    33,371,055
                                -----------  ---------   -------------  ------------
  Dividends and distributions
    from:
    Net investment income.....      --        (310,895)     (2,988,637)   (4,044,117)
    Net realized gain.........      --          --            --            (222,586)
    In excess of net
      investment income.......      --          --            --             --
                                -----------  ---------   -------------  ------------
        Total.................      --        (310,895)     (2,988,637)   (4,266,703)
                                -----------  ---------   -------------  ------------
  Transactions in shares of
    beneficial interest:
    Net proceeds from sales...   12,629,086  14,176,359     50,302,526    41,054,512
    Reinvestment of dividends
      and distributions.......      --         310,895       2,988,637     4,266,703
    Cost of shares
      repurchased.............   (4,658,615) (8,675,047)    (1,946,403)   (7,173,082)
                                -----------  ---------   -------------  ------------
        Net increase
          (decrease)..........    7,970,471  5,812,207      51,344,760    38,148,133
                                -----------  ---------   -------------  ------------
        Total increase
          (decrease)..........   13,819,854  21,279,909     66,839,403    67,252,485
NET ASSETS:
  Beginning of period.........   66,995,170  45,715,261    205,738,524   138,486,039
                                -----------  ---------   -------------  ------------
  END OF PERIOD...............  $80,815,024  66,$995,170 $ 272,577,927  $205,738,524
                                -----------  ---------   -------------  ------------
                                -----------  ---------   -------------  ------------
Undistributed Net Investment
  Income
  (Distributions In Excess of
  Net Investment Income)......  $   326,563    1$31,980  $     (11,773) $     73,685
                                -----------  ---------   -------------  ------------
                                -----------  ---------   -------------  ------------
SHARES ISSUED AND REPURCHASED:
  Sold........................      777,971  1,056,301       4,107,601     3,795,718
  Issued in reinvestment of
    dividends and
    distributions.............      --          24,762         240,807       397,706
  Repurchased.................     (293,891)  (649,418)       (161,021)     (688,539)
                                -----------  ---------   -------------  ------------
  Net increase (decrease).....      484,080    431,645       4,187,387     3,504,885
                                -----------  ---------   -------------  ------------
                                -----------  ---------   -------------  ------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
<PAGE>
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                      EUROPEAN GROWTH              PACIFIC GROWTH                EQUITY          STRATEGIST
                                ---------------------------  ---------------------------  ---------------------  ----------
                                    1996           1995          1996           1995         1996        1995       1996
                                -------------  ------------  -------------  ------------  ----------   --------  ----------
<S>                             <C>            <C>           <C>            <C>           <C>          <C>       <C>
INCREASE (DECREASE) IN NET
  ASSETS:
  Operations:
    Net investment income.....  $   1,743,141  $  2,114,492  $     847,880  $  1,021,997  $1,254,859   $2,708,609 $5,800,788
    Net realized gain
      (loss)..................     10,929,279    10,996,721        833,066    (2,760,376) 31,141,960   66,181,855  1,571,948
    Net change in unrealized
  appreciation/depreciation...     13,524,470    24,638,745      5,235,107     6,493,134    (642,072)  28,684,738 14,376,253
                                -------------  ------------  -------------  ------------  ----------   --------  ----------
        Net increase
          (decrease)..........     26,196,890    37,749,958      6,916,053     4,754,755  31,754,747   97,575,202 21,748,989
                                -------------  ------------  -------------  ------------  ----------   --------  ----------
  Dividends and distributions
    from:
    Net investment income.....       --          (1,774,678)      --            (719,960) (1,276,440)  (3,058,144) (5,802,390)
    Net realized gain.........       --          (5,391,962)      --             (15,252)     --          --         --
    In excess of net
      investment income.......       --            (210,717)      --             --           --          --         --
                                -------------  ------------  -------------  ------------  ----------   --------  ----------
        Total.................       --          (7,377,357)      --            (735,212) (1,276,440)  (3,058,144) (5,802,390)
                                -------------  ------------  -------------  ------------  ----------   --------  ----------
  Transactions in shares of
    beneficial interest:
    Net proceeds from sales...     26,418,248    18,351,213     52,647,664    33,260,368  74,060,386   60,875,983 12,384,984
    Reinvestment of dividends
      and distributions.......       --           7,377,357       --             735,212   1,276,440   3,058,144  5,802,390
    Cost of shares
      repurchased.............     (6,545,021)  (20,019,201)    (5,373,089)  (15,110,167) (8,219,779)  (23,961,072) (24,505,481)
                                -------------  ------------  -------------  ------------  ----------   --------  ----------
        Net increase
          (decrease)..........     19,873,227     5,709,369     47,274,575    18,885,413  67,117,047   39,973,055 (6,318,107)
                                -------------  ------------  -------------  ------------  ----------   --------  ----------
        Total increase
          (decrease)..........     46,070,117    36,081,970     54,190,628    22,904,956  97,595,354   134,490,113  9,628,492
NET ASSETS:
  Beginning of period.........    188,119,409   152,037,439     98,330,295    75,425,339  359,779,370  225,289,257 388,579,169
                                -------------  ------------  -------------  ------------  ----------   --------  ----------
  END OF PERIOD...............  $ 234,189,526  $188,119,409  $ 152,520,923  $ 98,330,295  $457,374,724 $359,779,370 $398,207,661
                                -------------  ------------  -------------  ------------  ----------   --------  ----------
                                -------------  ------------  -------------  ------------  ----------   --------  ----------
Undistributed Net Investment
  Income
  (Distributions In Excess of
  Net Investment Income)......  $   1,532,424  $   (210,717) $   2,411,337  $  1,563,457  $      162   $ 21,743  $   45,711
                                -------------  ------------  -------------  ------------  ----------   --------  ----------
                                -------------  ------------  -------------  ------------  ----------   --------  ----------
SHARES ISSUED AND REPURCHASED:
  Sold........................      1,396,230     1,106,630      5,079,449     3,543,683   2,591,282   2,501,214    959,023
  Issued in reinvestment of
    dividends and
    distributions.............       --             454,397       --              79,076      45,001    136,228     450,297
  Repurchased.................       (358,910)   (1,268,442)      (518,534)   (1,630,781)   (296,907)  (1,080,135) (1,913,294)
                                -------------  ------------  -------------  ------------  ----------   --------  ----------
  Net increase (decrease).....      1,037,320       292,585      4,560,915     1,991,978   2,339,376   1,557,307   (503,974)
                                -------------  ------------  -------------  ------------  ----------   --------  ----------
                                -------------  ------------  -------------  ------------  ----------   --------  ----------
 
<CAPTION>
 
                                  1995
                                --------
<S>                             <C>
INCREASE (DECREASE) IN NET
  ASSETS:
  Operations:
    Net investment income.....  $19,633,402
    Net realized gain
      (loss)..................  4,287,366
    Net change in unrealized
  appreciation/depreciation...  10,997,160
                                --------
        Net increase
          (decrease)..........  34,917,928
                                --------
  Dividends and distributions
    from:
    Net investment income.....  (21,267,198)
    Net realized gain.........  (13,902,986)
    In excess of net
      investment income.......     --
                                --------
        Total.................  (35,170,184)
                                --------
  Transactions in shares of
    beneficial interest:
    Net proceeds from sales...  24,116,300
    Reinvestment of dividends
      and distributions.......  35,170,184
    Cost of shares
      repurchased.............  (63,215,404)
                                --------
        Net increase
          (decrease)..........  (3,928,920)
                                --------
        Total increase
          (decrease)..........  (4,181,176)
NET ASSETS:
  Beginning of period.........  392,760,345
                                --------
  END OF PERIOD...............  $388,579,169
                                --------
                                --------
Undistributed Net Investment
  Income
  (Distributions In Excess of
  Net Investment Income)......  $ 47,313
                                --------
                                --------
SHARES ISSUED AND REPURCHASED:
  Sold........................  1,957,299
  Issued in reinvestment of
    dividends and
    distributions.............  2,891,755
  Repurchased.................  (5,160,690)
                                --------
  Net increase (decrease).....  (311,636)
                                --------
                                --------
</TABLE>
<PAGE>
Dean Witter Variable Investment Series
Notes to Financial Statements JUNE 30, 1996 (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. All shares of the Fund
are  owned  by (1)  Northbrook  Life Insurance  Company  to fund  benefits under
certain flexible premium variable annuity contracts; (2) Allstate Life Insurance
Company of New  York to fund  benefits under certain  flexible premium  deferred
variable  annuity  contracts; and  (3) Paragon  Life  Insurance Company  to fund
benefits under certain flexible premium variable life insurance contracts issued
to certain employees of Dean Witter Discover & Co., an affiliate of Dean  Witter
InterCapital Inc. (the "Investment Manager").
 
    The  Fund, organized on February 25, 1983 as a Massachusetts business trust,
consists  of  eleven  Portfolios  ("Portfolios")  and  commenced  operations  as
follows:
<TABLE>
<CAPTION>
                                    COMMENCEMENT OF
           PORTFOLIO                  OPERATIONS
- -------------------------------  ---------------------
<S>                              <C>
Money Market...................  March 9, 1984
Quality Income Plus............  March 1, 1987
High Yield.....................  March 9, 1984
Utilities......................  March 1, 1990
Dividend Growth................  March 1, 1990
Capital Growth.................  March 1, 1991
 
<CAPTION>
                                    COMMENCEMENT OF
           PORTFOLIO                  OPERATIONS
- -------------------------------  ---------------------
<S>                              <C>
Global Dividend Growth.........  February 23, 1994
European Growth................  March 1, 1991
Pacific Growth.................  February 23, 1994
Equity.........................  March 9, 1984
Strategist +...................  March 1, 1987
</TABLE>
 
- ------------
+ Formerly known as Dean Witter Variable Investment Series -- Managed Assets.
 
    The investment objectives of each Portfolio are as follows:
 
<TABLE>
<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               Seeks,  as its primary objective,  to earn a high level
Income                of  current  income  and,  as  a  secondary  objective,
Plus                  capital appreciation, but only when consistent with its
                      primary  objective,  by  investing  primarily  in  U.S.
                      Government securities  and  higher-rated  fixed  income
                      securities  and  by  writing  covered  options  on such
                      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 Growth       Seeks  to   provide  reasonable   current  income   and
                      long-term  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.
</TABLE>
<PAGE>
 
DEAN WITTER VARIABLE INVESTMENT SERIES
NOTES TO FINANCIAL STATEMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
     PORTFOLIO                         INVESTMENT OBJECTIVE
<S>                   <C>
Capital               Seeks  long-term capital growth  by investing primarily
Growth                in common stocks.
Global Dividend       Seeks  to   provide  reasonable   current  income   and
Growth                long-term  growth  of income  and capital  by investing
                      primarily in  common  stocks of  companies,  issued  by
                      issuers  worldwide, with  a record  of paying dividends
                      and the potential for increasing dividends.
European Growth       Seeks to  maximize  the  capital  appreciation  of  its
                      investments by 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 through
                      investments  in  common  stock  and,  as  a   secondary
                      objective,  income, but  only when  consistent with its
                      primary objective.
Strategist            Seeks a high  total investment return  through a  fully
                      managed  investment policy utilizing equity securities,
                      investment  grade   fixed  income   and  money   market
                      securities,  writing covered options on such securities
                      and the collateralized sale of stock index options.
</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 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 will be valued
    at the  mean between  their latest  bid  and asked  price; (4)  when  market
    quotations  are not  readily available,  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; (5) certain of the Fund's
    portfolio securities may be valued by an outside pricing service approved by
    the Trustees. The  pricing service  utilizes 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, if available, in
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
NOTES TO FINANCIAL STATEMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
    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 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.
    The Money  Market Portfolio  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: 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  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.
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
NOTES TO FINANCIAL STATEMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
 
    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" 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 AGREEMENTS--Pursuant to an Investment
Management 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%;  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 - 0.75%;  European Growth  and Pacific  Growth -  1.0% to  the daily  net
assets.  Effective April 21, 1995, Quality Income Plus calculates the management
fee at  the following  rates:  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. Effective May  1, 1996, Dividend Growth  and Equity calculate  the
management  fee at the following rates: 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
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
NOTES TO FINANCIAL STATEMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
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  Morgan Grenfell Investment Services
Limited (the "Sub-Advisor") and the Investment Manager, the Sub-Advisor provides
the European Growth and the Pacific Growth Portfolios with investment advice and
portfolio management  relating to  the  Portfolios' investments  in  securities,
subject  to the overall  supervision of the  Investment Manager. As compensation
for its services provided pursuant to the Sub-Advisory Agreement, the Investment
Manager pays the Sub-Advisor  monthly compensation equal to  40% of its  monthly
compensation.
 
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 six months ended June 30, 1996
were as follows:
 
<TABLE>
<CAPTION>
                                                U.S. GOVERNMENT SECURITIES                    OTHER
                                            ----------------------------------  ----------------------------------
                                               PURCHASES      SALES/MATURITIES     PURCHASES      SALES/MATURITIES
                                            ----------------  ----------------  ----------------  ----------------
<S>                                         <C>               <C>               <C>               <C>
Money Market..............................  $      7,278,875  $      3,348,283  $    732,853,865  $    700,168,262
Quality Income Plus.......................       332,980,371       331,979,501       178,483,148       197,320,140
High Yield................................         --                --               96,481,569        51,560,641
Utilities.................................         --                --               18,018,182        35,466,950
Dividend Growth...........................         6,904,133         --              240,247,960       140,688,494
Capital Growth............................           276,950         --               27,733,764        25,545,199
Global Dividend Growth....................         --                --               99,657,169        48,419,629
European Growth...........................         --                --               83,186,790        58,252,746
Pacific Growth............................         --                --               71,032,757        25,187,160
Equity....................................         9,735,250        55,062,315       670,085,063       576,649,129
Strategist................................        92,991,473        76,953,330       180,771,304       212,676,114
</TABLE>
 
    Included in the aforementioned purchases  and sales of portfolio  securities
of  the Equity  Portfolio are  purchases and sales  of equity  securities of The
Allstate Corporation, the  parent company of  Northbrook Life Insurance  Company
and  Allstate Life Insurance Company of New York, affiliates of the Fund, in the
amount of  $4,893,248 and  $3,424,962,  respectively, realizing  a gain  in  the
amount of $280,910.
 
    For  the six months  ended June 30, 1996,  the following Portfolios incurred
commissions with  Dean  Witter  Reynolds  Inc.  ("DWR"),  an  affiliate  of  the
Investment  Manager,  for  portfolio  transactions  executed  on  behalf  of the
Portfolio:
 
<TABLE>
<CAPTION>
                                                                              GLOBAL
                                                      DIVIDEND     CAPITAL   DIVIDEND
                                          UTILITIES    GROWTH      GROWTH     GROWTH      EQUITY     STRATEGIST
                                          ---------  -----------  ---------  ---------  -----------  ---------
<S>                                       <C>        <C>          <C>        <C>        <C>          <C>
 Commissions............................  $  26,750  $   120,491  $  18,800  $  17,565  $   118,765  $  20,890
                                          ---------  -----------  ---------  ---------  -----------  ---------
                                          ---------  -----------  ---------  ---------  -----------  ---------
</TABLE>
 
    For the  six  months ended  June  30,  1996, the  Pacific  Growth  Portfolio
incurred brokerage commissions of $13,957 with affiliates of Morgan Grenfell for
portfolio transactions executed.
 
    Included  in Global Dividend Growth's  payable for investments purchased for
unsettled trades with DWR is $351,643 at June 30, 1996.
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
NOTES TO FINANCIAL STATEMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
 
    Included in the receivable  for investments sold  for unsettled trades  with
DWR at June 30, 1996 were as follows:
 
<TABLE>
<CAPTION>
                                                                                           GLOBAL
                                                                  DIVIDEND      CAPITAL   DIVIDEND
                                                                   GROWTH       GROWTH     GROWTH      EQUITY
                                                                -------------  ---------  ---------  -----------
<S>                                                             <C>            <C>        <C>        <C>
Receivable for investments sold...............................  $   2,450,993  $  70,948  $  64,398  $   675,557
                                                                -------------  ---------  ---------  -----------
                                                                -------------  ---------  ---------  -----------
</TABLE>
 
    Dean  Witter Trust Company,  an affiliate of the  Investment Manager, is the
Fund's transfer agent.  At June 30,  1996, each of  the Portfolios had  transfer
agent fees and expenses payable of $250.
 
    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,
1996 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                 DIVIDEND      CAPITAL
                                                      MARKET      PLUS       YIELD    UTILITIES    GROWTH       GROWTH
                                                     ---------  ---------  ---------  ---------  -----------  -----------
<S>                                                  <C>        <C>        <C>        <C>        <C>          <C>
Aggregate Pension Cost.............................  $      44  $      79  $      30  $      78   $     164    $      12
                                                     ---------  ---------  ---------  ---------  -----------       -----
                                                     ---------  ---------  ---------  ---------  -----------       -----
Accrued Pension Liability..........................  $  11,269  $   8,315  $   3,388  $   4,880   $   7,598    $     321
                                                     ---------  ---------  ---------  ---------  -----------       -----
                                                     ---------  ---------  ---------  ---------  -----------       -----
</TABLE>
 
<TABLE>
<CAPTION>
                                                                 GLOBAL
                                                                DIVIDEND     EUROPEAN      PACIFIC
                                                                 GROWTH       GROWTH       GROWTH      EQUITY    STRATEGIST
                                                               -----------  -----------  -----------  ---------  -----------
<S>                                                            <C>          <C>          <C>          <C>        <C>
Aggregate Pension Cost.......................................   $     567    $      35    $     304   $      70   $      65
                                                                    -----        -----        -----   ---------  -----------
                                                                    -----        -----        -----   ---------  -----------
Accrued Pension Liability....................................   $     481    $     743    $     867   $   6,279   $   9,681
                                                                    -----        -----        -----   ---------  -----------
                                                                    -----        -----        -----   ---------  -----------
</TABLE>
 
4.  FEDERAL INCOME  TAX STATUS--At December 31,  1995, 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,                     1996       1997       1998       1999       2000       2001       2002       2003       TOTAL
- ------------------------------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                             <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
Quality Income Plus...........     --         --         --         --         --         --      $  22,894     --      $  22,894
High Yield....................  $   7,297  $  10,694  $  34,291  $   7,336  $   3,057  $   4,736      3,256  $   3,311     73,978
Pacific Growth................     --         --         --         --         --         --         --          1,398      1,398
</TABLE>
 
    During  the year ended December 31,  1995, the following Portfolios utilized
approximate net capital loss carryovers:
 
<TABLE>
<CAPTION>
  QUALITY INCOME
       PLUS           UTILITIES    CAPITAL GROWTH     EQUITY
- ------------------  -------------  --------------  -------------
<S>                 <C>            <C>             <C>
  $    9,908,000    $   2,371,000   $  1,105,000   $   6,496,000
- ------------------  -------------  --------------  -------------
- ------------------  -------------  --------------  -------------
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
NOTES TO FINANCIAL STATEMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
 
    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 1995:
 
<TABLE>
<CAPTION>
GLOBAL DIVIDEND GROWTH  EUROPEAN GROWTH   PACIFIC GROWTH
- ----------------------  ----------------  --------------
<S>                     <C>               <C>
      $    5,000          $    633,000     $  2,310,000
         -------        ----------------  --------------
         -------        ----------------  --------------
</TABLE>
 
    At    December   31,   1995,   the   primary   reason(s)   for   significant
temporary/permanent book/tax differences were as follows:
 
<TABLE>
<CAPTION>
                                                                   TEMPORARY DIFFERENCES      PERMANENT DIFFERENCES
                                                               -----------------------------  ---------------------
                                                               POST-OCTOBER  LOSS DEFERRALS     FOREIGN CURRENCY
                                                                  LOSSES     FROM WASH SALES      GAINS/LOSSES
                                                               ------------  ---------------  ---------------------
<S>                                                            <C>           <C>              <C>
Quality Income Plus..........................................                       -
High Yield...................................................                       -
Utilities....................................................                       -
Dividend Growth..............................................                       -
Capital Growth...............................................                       -
Global Dividend Growth.......................................       -               -                   -
European Growth..............................................       -               -                   -
Pacific Growth...............................................       -               -                   -
Equity.......................................................                       -
</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--The  Global
Dividend  Growth, European Growth  and Pacific Growth  Portfolios 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 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.
 
    At  June  30,  1996,  there  were  outstanding  forward  contracts  used  to
facilitate settlement of foreign currency denominated portfolio transactions and
to manage foreign currency exposure.
 
    Forward  contracts  and over-the-counter  purchased  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  purchased put options on foreign currencies from the potential
inability of the counterparties to meet the terms of their contracts.
 
    At June 30, 1996,  the European Growth and  Pacific Growth Portfolios'  cash
balance  consisted principally of interest bearing deposits with Chase Manhattan
Bank N.A., the Fund's custodian.
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
NOTES TO FINANCIAL STATEMENTS JUNE 30, 1996 (UNAUDITED) (CONTINUED)
- --------------------------------------------------------------------------------
 
6.   COMMITMENTS--As of  June 30,  1996,  the Pacific  Growth Portfolio  had  an
outstanding  commitment of $70,000 resulting from the purchase of partially paid
units of Peregrine Indonesia. The balance is payable on January 1, 1997.
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
SELECTED RATIOS AND PER SHARE DATA FOR A COMMON SHARE OF BENEFICIAL INTEREST
OUTSTANDING THROUGHOUT EACH PERIOD:
 
<TABLE>
<CAPTION>
                          NET ASSET
                            VALUE        NET        NET REALIZED    TOTAL FROM
                          BEGINNING   INVESTMENT   AND UNREALIZED   INVESTMENT   DIVIDENDS TO   DISTRIBUTIONS TO
   YEAR ENDED DEC. 31     OF PERIOD     INCOME      GAIN (LOSS)     OPERATIONS   SHAREHOLDERS     SHAREHOLDERS
       ----------         ---------   ----------   --------------   ----------   ------------   ----------------
<S>                       <C>         <C>          <C>              <C>          <C>            <C>
MONEY MARKET
1991                       $ 1.00       $0.056         $--           $  0.056      $(0.056)         $--
1992                         1.00        0.034         --               0.034       (0.034)         --
1993                         1.00        0.027         --               0.027       (0.027)         --
1994                         1.00        0.037         --               0.037       (0.037)         --
1995                         1.00        0.055         --               0.055       (0.055)         --
1996(a)                      1.00        0.024         --               0.024       (0.024)         --
QUALITY INCOME PLUS
1991                         9.49         0.85           0.85            1.70        (0.85)         --
1992                        10.34         0.77           0.05            0.82        (0.77)         --
1993                        10.39         0.69           0.64            1.33        (0.69)         --
1994                        11.03         0.69          (1.40)          (0.71)       (0.69)           (0.18)
1995                         9.45         0.72           1.50            2.22        (0.71)         --
1996(a)                     10.96         0.35          (0.77)          (0.42)       (0.36)         --
HIGH YIELD
1991                         4.55         0.70           1.81            2.51        (0.70)           (0.11)*
1992                         6.25         0.96           0.18            1.14        (0.96)         --
1993                         6.43         0.81           0.68            1.49        (0.81)         --
1994                         7.11         0.79          (0.95)          (0.16)       (0.79)         --
1995                         6.16         0.80           0.08            0.88        (0.78)         --
1996(a)                      6.26         0.38           0.02            0.40        (0.40)         --
UTILITIES
1991                        10.02         0.54           1.45            1.99        (0.54)         --
1992                        11.47         0.51           0.88            1.39        (0.52)         --
1993                        12.34         0.49           1.43            1.92        (0.50)           (0.02)
1994                        13.74         0.53          (1.75)          (1.22)       (0.52)           (0.08)
1995                        11.92         0.53           2.81            3.34        (0.58)         --
1996(a)                     14.68         0.27           0.32            0.59        (0.27)         --
DIVIDEND GROWTH
1991                         8.93         0.36           2.08            2.44        (0.37)         --
1992                        11.00         0.37           0.51            0.88        (0.37)         --
1993                        11.51         0.36           1.27            1.63        (0.36)         --
1994                        12.78         0.38          (0.80)          (0.42)       (0.37)         --
1995                        11.99         0.38           3.89            4.27        (0.41)           (0.26)
1996(a)                     15.59         0.20           1.39            1.59        (0.20)         --
</TABLE>
 
- ------------
 
 (a)   For the six months ended June 30, 1996 (unaudited).
  +    Calculated  based on the net  asset value as of  the last business day of
       the period.
  *    Distribution from capital.
 (1)   Not annualized.
 (2)   Annualized.
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                            RATIOS TO
                                                                       AVERAGE NET ASSETS
                                                                      ---------------------
TOTAL DIVIDENDS          NET ASSET       TOTAL        NET ASSETS AT                  NET      PORTFOLIO    AVERAGE
      AND                VALUE END     INVESTMENT     END OF PERIOD                INVESTMENT TURNOVER    COMMISSION
 DISTRIBUTIONS           OF PERIOD      RETURN+          (000'S)       EXPENSES     INCOME      RATE      RATE PAID
- ----------------        -----------  --------------   --------------  ----------   --------   --------   ------------
<S>                     <C>          <C>              <C>             <C>          <C>        <C>        <C>
     $   (0.056)             $1.00          5.75%         $ 104,277      0.57%      5.62%       N/A         N/A
         (0.034)              1.00          3.43             96,151      0.59       3.38        N/A         N/A
         (0.027)              1.00          2.75            129,925      0.57       2.71        N/A         N/A
         (0.037)              1.00          3.81            268,624      0.55       3.93        N/A         N/A
         (0.055)              1.00          5.66            249,787      0.53       5.52        N/A         N/A
         (0.024)              1.00          2.48(1)         286,154      0.53(2)    4.92(2)     N/A         N/A
         (0.85)              10.34         18.75             81,918      0.60       8.39        105%        N/A
         (0.77)              10.39          8.26            163,368      0.58       7.41        148         N/A
         (0.69)              11.03         12.99            487,647      0.56       6.17        219         N/A
         (0.87)               9.45         (6.63)           414,905      0.54       6.88        254         N/A
         (0.71)              10.96         24.30            520,579      0.54       7.07        162         N/A
         (0.36)              10.18         (3.75)(1)        470,100      0.55(2)    6.75(2)     105(1)      N/A
         (0.81)               6.25         58.14             34,603      1.01      12.29        300         N/A
         (0.96)               6.43         18.35             40,042      0.74      14.05        204         N/A
         (0.81)               7.11         24.08             90,200      0.60      11.80        177         N/A
         (0.79)               6.16         (2.47)           111,934      0.59      11.71        105         N/A
         (0.78)               6.26         14.93            154,310      0.54      12.67         58         N/A
         (0.40)               6.26          6.54(1)         201,016      0.51(2)   12.50(2)      31(1)      N/A
         (0.54)              11.47         20.56             68,449      0.80       5.23         25          --
         (0.52)              12.34         12.64            153,748      0.73       4.63         26          --
         (0.52)              13.74         15.69            490,934      0.71       3.75         11          --
         (0.60)              11.92         (9.02)           382,412      0.68       4.21         15          --
         (0.58)              14.68         28.65            479,070      0.68       4.00         13          --
         (0.27)              15.00          4.07(1)         464,640      0.67(2)    3.67(2)       4(1)   $   0.0539
         (0.37)              11.00         27.76             98,023      0.73       3.61          6          --
         (0.37)              11.51          8.16            192,551      0.69       3.42          4          --
         (0.36)              12.78         14.34            483,145      0.68       3.01          6          --
         (0.37)              11.99         (3.27)           572,952      0.64       3.13         20          --
         (0.67)              15.59         36.38            865,417      0.61       2.75         24          --
         (0.20)              16.98         10.23(1)       1,049,784      0.58(2)    2.50(2)      15(1)       0.0546
</TABLE>
 
<PAGE>
DEAN WITTER VARIABLE INVESTMENT SERIES
FINANCIAL HIGHLIGHTS (CONTINUED)
- --------------------------------------------------------------------------------
SELECTED RATIOS AND PER SHARE DATA FOR A COMMON SHARE OF BENEFICIAL INTEREST
OUTSTANDING THROUGHOUT EACH PERIOD:
 
<TABLE>
<CAPTION>
                          NET ASSET
                            VALUE        NET        NET REALIZED    TOTAL FROM
                          BEGINNING   INVESTMENT   AND UNREALIZED   INVESTMENT   DIVIDENDS TO   DISTRIBUTIONS TO
   YEAR ENDED DEC. 31     OF PERIOD     INCOME      GAIN (LOSS)     OPERATIONS   SHAREHOLDERS     SHAREHOLDERS
       ----------         ---------   ----------   --------------   ----------   ------------   ----------------
<S>                       <C>         <C>          <C>              <C>          <C>            <C>
CAPITAL GROWTH
1991(b)                    $10.00       $ 0.15         $ 2.67        $   2.82      $ (0.13)         $--
1992                        12.69         0.07           0.13            0.20        (0.08)           (0.02)
1993                        12.79         0.08          (0.98)          (0.90)       (0.08)         --
1994                        11.81         0.10          (0.26)          (0.16)       (0.10)           (0.03)
1995                        11.52         0.10           3.68            3.78        (0.08)         --
1996(a)                     15.22         0.04           1.28            1.32       --              --
GLOBAL DIVIDEND GROWTH
1994(c)                     10.00         0.23          (0.20)           0.03        (0.21)         --
1995                         9.82         0.24           1.90            2.14        (0.26)           (0.01)
1996(a)                     11.69         0.14           0.82            0.96        (0.14)         --
EUROPEAN GROWTH
1991(b)                     10.00         0.25          (0.13)           0.12        (0.23)         --
1992                         9.89         0.08           0.32            0.40        (0.10)           (0.01)
1993                        10.18         0.12           3.98            4.10        (0.12)           (0.13)
1994                        14.03         0.17           0.96            1.13        (0.16)           (0.44)
1995                        14.56         0.20           3.50            3.70        (0.19)**         (0.54)
1996(a)                     17.53         0.12           2.25            2.37       --              --
PACIFIC GROWTH
1994(c)                     10.00         0.07          (0.74)          (0.67)      --                (0.07)
1995                         9.26         0.12           0.41            0.53        (0.09)         --
1996(a)                      9.70         0.15           0.53            0.68       --              --
EQUITY
1991                        14.10         0.20           8.05            8.25        (0.21)         --
1992                        22.14         0.23          (0.47)          (0.24)       (0.24)           (1.86)
1993                        19.80         0.15           3.63            3.78        (0.15)           (1.28)
1994                        22.15         0.23          (1.31)          (1.08)       (0.22)           (1.60)
1995                        19.25         0.22           7.92            8.14        (0.25)         --
1996(a)                     27.14         0.09           2.18            2.27        (0.09)         --
STRATEGIST
1991                         9.81         0.47           2.24            2.71        (0.50)         --
1992                        12.02         0.44           0.41            0.85        (0.45)           (0.13)
1993                        12.29         0.38           0.86            1.24        (0.38)           (0.47)
1994                        12.68         0.48           0.01            0.49        (0.46)           (0.26)
1995                        12.45         0.62           0.49            1.11        (0.67)           (0.44)
1996(a)                     12.45         0.19           0.51            0.70        (0.19)         --
</TABLE>
 
- ------------
 
 (a)   For the six months ended June 30, 1996 (unaudited).
       Commencement of operations:
 (b)   March 1, 1991.
 (c)   February 23, 1994.
  +    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 the
       management fee for the  period March 1, 1991  through December 31,  1991,
       the  ratios of expenses to  average net assets would  have been 1.60% for
       Capital Growth and 4.12% for European Growth.
 (4)   If the Investment  Manager had not  assumed all expenses  and waived  the
       management fee for the periods February 23, 1994 through May 12, 1994 for
       Global  Dividend Growth and February 23,  1994 through August 2, 1994 for
       Pacific Growth, the ratios of expenses  to average net assets would  have
       been 0.97% for Global Dividend Growth and 1.40% for Pacific Growth.
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                          RATIOS TO
                                                                     AVERAGE NET ASSETS
                                                                 ---------------------------
    TOTAL         NET ASSET        TOTAL        NET ASSETS AT                         NET       PORTFOLIO      AVERAGE
DIVIDENDS AND     VALUE END      INVESTMENT     END OF PERIOD                      INVESTMENT   TURNOVER      COMMISSION
DISTRIBUTIONS     OF PERIOD       RETURN+          (000'S)          EXPENSES        INCOME        RATE        RATE PAID
- --------------   -----------   --------------   --------------   --------------    ---------    ---------    ------------
<S>              <C>           <C>              <C>              <C>               <C>          <C>          <C>
     $  (0.13)   $12.69              28.41%(1)      $  18,400         --%(2)(3)     1.82%(2)       32%(1)        --
        (0.10)    12.79               1.64             45,105       0.86            0.62           22            --
        (0.08)    11.81              (6.99)            50,309       0.74            0.78           36            --
        (0.13)    11.52              (1.28)            45,715       0.77            0.90           37            --
        (0.08)    15.22              32.92             66,995       0.74            0.70           34            --
      --          16.54               8.67(1)          80,815       0.71(2)         0.53           36(1)     $   0.0555
        (0.21)     9.82               0.27(1)         138,486       0.87(2)(4)      2.62(2)        20(1)         --
        (0.27)    11.69              22.14            205,739       0.88            2.23           55            --
        (0.14)    12.51               8.25(1)         272,578       0.85(2)         2.46(2)        21(1)         0.0348
        (0.23)     9.89               1.34(1)           3,653      --   (2)(3)      3.18(2)        77(1)         --
        (0.11)    10.18               3.99             10,686       1.73            0.74           97            --
        (0.25)    14.03              40.88             79,052       1.28            0.97           77            --
        (0.60)    14.56               8.36            152,037       1.16            1.51           58            --
        (0.73)    17.53              25.89            188,119       1.17            1.25           69            --
      --          19.90              13.52(1)         234,190       1.05(2)         1.68(2)        29(1)         0.0449
        (0.07)     9.26              (6.73)(1)         75,425       1.00(2)(4)      0.56(2)        22(1)         --
        (0.09)     9.70               5.74             98,330       1.44            1.23           53            --
      --          10.38               7.01(1)         152,521       1.26(2)         1.27(2)        20(1)         0.0118
        (0.21)    22.14              59.05             63,524       0.64            1.09          214            --
        (2.10)    19.80               0.05             77,527       0.62            1.22          286            --
        (1.43)    22.15              19.72            182,828       0.58            0.69          265            --
        (1.82)    19.25              (4.91)           225,289       0.57            1.19          299            --
        (0.25)    27.14              42.53            359,779       0.54            0.97          269            --
        (0.09)    29.32               8.41(1)         457,375       0.54(2)         0.62(2)       160(1)         0.0585
        (0.50)    12.02              28.26             87,779       0.60            4.34           86            --
        (0.58)    12.29               7.24            136,741       0.58            3.74           87            --
        (0.85)    12.68              10.38            287,502       0.57            3.11           57            --
        (0.72)    12.45               3.94            392,760       0.54            3.93          125            --
        (1.11)    12.45               9.48            388,579       0.52            5.03          329            --
        (0.19)    12.96               5.73(1)         398,208       0.53(2)         2.96(2)        74(1)         0.0574
</TABLE>
 
<PAGE>
                     [This page left blank intentionally.]
<PAGE>
                                    Trustees
             ------------------------------------------------------
 
              Michael Bozic                   Dr. Manuel H. Johnson
              Charles A. Fiumefreddo                    Paul Kolton
              Edwin J. Garn                       Michael E. Nugent
              John R. Haire                       Philip J. Purcell
                                                  John L. Schroeder
 
                                    Officers
             ------------------------------------------------------
                             Charles A. Fiumefreddo
                      CHAIRMAN AND CHIEF EXECUTIVE OFFICER
 
                                 Sheldon Curtis
                 VICE PRESIDENT, SECRETARY AND GENERAL COUNSEL
 
                                Thomas F. Caloia
                                   TREASURER
 
             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
 
                               Investment Manager
             ------------------------------------------------------
                         Dean Witter InterCapital Inc.
                             Two World Trade Center
                            New York, New York 10048
 
                                  Sub-Adviser
                 (European Growth and Pacific Growth Portfolio)
             ------------------------------------------------------
                  Morgan Grenfell Investment Services Limited
 
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>
                                                               SEMIANNUAL REPORT
                                                                   JUNE 30, 1996
<PAGE>



Northbrook Life                             Dean Witter Variable
Insurance Company                           Investment Series
P.O. Box 94040
Palatine, IL 60094-4046






- ----------------
 Bulk Rate Mail                            SEMIANNUAL REPORT
   US Postage                              [caad 214]JUNE 30, 1996
      PAID
Rockville Centre
    NY 11570
 PERMIT NO. 150                            DEAN WITTER
- ----------------



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