JANUS ASPEN SERIES
N-30D, 1998-02-27
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                               Janus Aspen Series

                                      1997

                                 Annual Report

                                                                   [Logo]  JANUS

<PAGE>

                               TABLE OF CONTENTS

                               JANUS ASPEN SERIES
- --------------------------------------------------------------------------------
Portfolio Managers' Commentary and Schedules of Investments
- --------------------------------------------------------------------------------
     Growth Portfolio                                                         12
- --------------------------------------------------------------------------------
     Aggressive Growth Portfolio                                              16
- --------------------------------------------------------------------------------
     Capital Appreciation Portfolio                                           20
- --------------------------------------------------------------------------------
     International Growth Portfolio                                           23
- --------------------------------------------------------------------------------
     Worldwide Growth Portfolio                                               29
- --------------------------------------------------------------------------------
     Balanced Portfolio                                                       35
- --------------------------------------------------------------------------------
     Equity Income Portfolio                                                  39
- --------------------------------------------------------------------------------
     Flexible Income Portfolio                                                42
- --------------------------------------------------------------------------------
     High-Yield Portfolio                                                     46
- --------------------------------------------------------------------------------
     Short-Term Bond Portfolio                                                50
- --------------------------------------------------------------------------------
     Money Market Portfolio                                                   52
- --------------------------------------------------------------------------------
Notes to Schedules of Investments                                             53
- --------------------------------------------------------------------------------
Statements of Assets and Liabilities                                          54
- --------------------------------------------------------------------------------
Statements of Operations                                                      54
- --------------------------------------------------------------------------------
Statements of Changes in Net Assets                                           56
- --------------------------------------------------------------------------------
Financial Highlights                                                          58
- --------------------------------------------------------------------------------
Notes to Financial Statements                                                 61
- --------------------------------------------------------------------------------
Report of Independent Accountants                                             65
- --------------------------------------------------------------------------------

<PAGE>

         JANUS ASPEN GROWTH PORTFOLIO Portfolio Manager, James P. Craig

Market Review

For the first six  months,  only the very  largest,  most  liquid  stocks  drove
performance in the equity  market.  In fact,  during the first quarter,  the 100
largest  stocks  in the S&P 500 Index  accounted  for  approximately  86% of the
Index's gains. As economic growth and inflation  concerns moderated at mid-year,
investors  rediscovered small and midsize stocks. Many larger stocks,  which had
become overvalued, lost ground.

Most stocks,  however, were impacted in the fourth quarter by a financial crisis
in Southeast  Asia.  Globally,  the market  discounted a wide variety of stocks,
especially  technology  issues,  in  anticipation  of how the Asia debacle might
affect their future  earnings.  As a result,  there was a rise in demand for the
companies that are better insulated from the situation in the Far East.

- --------------------------------------------------------------------------------
Portfolio Profile                  December 31, 1997      December 31, 1996
Equities                                 91.3%                  80.3%
   Foreign                                9.4%                  14.4%
   Europe                                 9.4%                  12.0%
Top 10 Equities                          27.1%                  21.5%
Number of Stocks                           80                    124
Cash & Cash Equivalents                   8.7%                  19.7%
- --------------------------------------------------------------------------------

An Updated Portfolio Strategy

I have always believed that a stock was overvalued when its price-earnings (P/E)
ratio was  higher  than its  estimated  rate of future  earnings  growth.  I now
realize   that  this   valuation   standard  no  longer   applies.   Ours  is  a
liquidity-driven  market  because  equities  are the  investment  of choice  for
retirement savings. As a result, we have entered a new era of higher P/Es.

Applying  strict  valuation  rules in the first half caused me to sell positions
too early in some  cases  and not to invest  quickly  enough in  others.  In the
second half, I adjusted my strategy to the new,  high-P/E  environment,  holding
positions a bit longer and buying  more  aggressively  when my  favorite  stocks
declined.

As a result,  I was faced with a much broader array of prospective  investments.
Cash levels,  which had hovered at 15% to 20% of assets, fell. Longer term, this
more flexible strategy will help to reduce portfolio turnover as well.

What did not change was my faith in earnings  as the  predictor  of prices.  The
Portfolio  remains a mix of  companies  with  consistent  earnings  patterns and
long-term potential to exceed analysts' earnings estimates.

Stock Highlights

I made a  number  of major  adjustments  to the  Portfolio  over  the  year,  in
particular,  reducing  financial  stocks.  In their place, I purchased stocks of
market-dominating technology and cable companies with strong management teams.

Among the better-known  names are Cisco Systems,  a preemi-nent  manufacturer of
networking equipment;  Texas Instruments,  a leading producer of semiconductors;
Microsoft,   the   dominant   player  in   personal   computer   software;   and
Tele-Communi-cations,  Inc., a nationwide  cable  operator.  Less well-known but
just    as    promising    are    Cadence    Design     Systems,     maker    of
semiconductor-manufacturing   software,   and  Maxim  Integrated   Products,   a
high-value-added niche supplier of analog semiconductors.

A new  position in the energy  sector was  Schlumberger,  Ltd.  Although oil and
natural  gas prices  declined  in 1997,  production  volumes  continued  to grow
rapidly,  fostering  strong  demand for the  company's  drilling  rigs and other
equipment and services.

Finally,  we maintained our investment in pharmaceuticals  because, in our view,
they still have excellent long-term  potential.  An aging population in the U.S.
and the opening of new markets  worldwide  can only add up to increased  demand.
Eli Lilly and Pfizer both made strong contributions.

One  pharmaceutical  stock  that  has  not  yet  lived  up  to  expectations  is
Warner-Lambert,  which enjoyed a terrific year following the introduction of two
newly approved drugs.  Both achieved almost  unprecedented  early acceptance and
sales. Toward year-end,  however, Rezulin, a treatment for diabetes,  suffered a
setback when the FDA  mandated  additional  tests as a result of liver  toxicity
issues.  The  downturn  seems to have been  temporary  with the drug's  benefits
appearing to outweigh  the  negatives.  The stock  bounced back in early 1998 as
sales  improved.  While this drug may not reach our  original  expectations,  it
still has substantial potential.

Although  the  majority  of  the  Portfolio  posted  gains,  there  were  a  few
disappointments. We bought Pioneer Natural Resources, created from the merger of
Parker Parsley and Mesa Petroleum,  on the belief that it would increase oil and
natural gas production. Ultimately, production volumes and reserve levels failed
to reach  projections,  and we trimmed our position.  Because current valuations
have already taken the lower  production  forecast into account,  we are holding
the remaining position.

The Outlook

As we enter  1998,  I  believe  it is more  important  than  ever to  invest  in
businesses with solid earnings records and earnings growth  potential.  In light
of the recent declines in world markets, it will be difficult for some companies
to meet analysts' estimates,  and I look for considerable short-term volatility.
However,  companies  that can  successfully  hit earnings  targets are likely to
attract a large share of investors' interest.

I am confident that the stocks in the Portfolio have excellent  potential;  they
appear to be fundamentally sound investments with very predictable  earnings. We
feel they should  benefit from  investors'  continuing  enthusiasm for stocks in
general, as well as the current low-interest-rate, low-inflation environment.

Thank you for your continued investment in Janus Aspen Growth Portfolio.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

         JANUS ASPEN GROWTH PORTFOLIO Portfolio Manager, James P. Craig

- --------------------------------------------------------------------------------
Average Annual Total Return(1)
For the Periods Ended December 31, 1997
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 9/13/93)
  1 Year                                                22.75%
  From Inception                                        17.71%
- --------------------------------------------------------------------------------
S&P 500 Index
  1 Year                                                33.35%
  From Inception Date
    of Institutional Shares                             21.77%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                   --
  From Inception                                        17.22%
- --------------------------------------------------------------------------------
Note: Performance of the Retirement  Shares is lower from the performance  shown
      on this graph for the  Institutional  Shares,  based upon the higher  fees
      paid by shareholders investing in this class.
- --------------------------------------------------------------------------------

Performance Overview(1)          Source - Lipper Analytical Services, Inc. 1997.

GRAPHIC

A graphic comparison of the change in value of a hypothetical  10,000 investment
in Janus Aspen Growth  Portfolio -  Institutional  Shares and the S&P 500 Index.
Janus Aspen Growth  Portfolio -  Institutional  Shares is represented by a solid
black line.  The S&P 500 Index is  represented  by a dashed black line.  The "y"
axis reflects the value of the investment. The "x" axis reflects the computation
periods from inception, September 13, 1993, through December 31, 1997. The upper
right quadrant reflects the ending value of the hypothetical investment in Janus
Aspen Growth  Portfolio - Institutional  Shares ($20,130) as compared to the S&P
500 Index ($23,286).

(1)  All returns reflect reinvested  dividends.  The Portfolio's  securities may
     differ significantly from the securities in the Index. Index returns do not
     include  taxes or  dividends  and interest  payments or operating  expenses
     necessary to maintain a portfolio  consisting of the same  securities  that
     are in the Index.  These returns do not reflect the charges and expenses of
     any particular  insurance product or qualified plan.  Investment return and
     principal value will fluctuate so that shares, when redeemed,  may be worth
     more or less than their  original cost.  The advisor  voluntarily  waives a
     portion of the Portfolio's  expenses.  Without such waiver, the Portfolio's
     total returns for each class would have been lower.  Past  performance does
     not guarantee future results.

                 JANUS ASPEN GROWTH PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Common Stock - 91.3%
- --------------------------------------------------------------------------------
Appliances - 0.2%
      20,177    Electrolux A.B. - Class B                           $  1,401,186
- --------------------------------------------------------------------------------
Automotive - Truck Parts and Equipment - 1.7%
     253,275    Federal-Mogul Corp.                                   10,257,637
- --------------------------------------------------------------------------------
Beverages - Non-Alcoholic - 0.2%
      32,550    Coca-Cola Enterprises, Inc.                            1,157,559
- --------------------------------------------------------------------------------
Cable Television - 5.5%
     450,975    Comcast Corp. - Special Class A                       14,233,898
     699,245    Tele-Communications, Inc. - Class A*                  19,535,157
- --------------------------------------------------------------------------------
                                                                      33,769,055
- --------------------------------------------------------------------------------
Chemicals - Diversified - 5.2%
      39,825    Cytec Industries, Inc.*                                1,869,286
     141,200    E.I. du Pont de Nemours and Co.                        8,480,825
      50,000    Imperial Chemical Industries PLC (ADR)                 3,246,875
     354,075    Monsanto Co.                                          14,871,150
     128,210    Solutia, Inc.                                          3,421,604
- --------------------------------------------------------------------------------
                                                                      31,889,740
- --------------------------------------------------------------------------------
Circuits - 3.2%
     150,000    Analog Devices, Inc.*                                  4,153,125
     100,700    Linear Technology Corp.                                5,802,837
     271,700    Maxim Integrated Products, Inc.*                       9,373,650
- --------------------------------------------------------------------------------
                                                                     19,329,612
- --------------------------------------------------------------------------------
Commercial Banks - 1.4%
       9,475    First Empire State Corp.                               4,405,875
      19,275    Northern Trust Corp.                                   1,344,431
      54,550    Star Banc Corp.                                        3,129,806
- --------------------------------------------------------------------------------
                                                                       8,880,112
- --------------------------------------------------------------------------------
Computer Services - 0.6%
      96,200    Gartner Group, Inc. - Class A*                         3,583,450
- --------------------------------------------------------------------------------
Computer Software - 7.3%
     497,050    Cadence Design Systems, Inc.*                       $ 12,177,725
     133,425    Microsoft Corp.*                                      17,245,181
     311,300    Parametric Technology Co.*                            14,747,838
- --------------------------------------------------------------------------------
                                                                      44,170,744
- --------------------------------------------------------------------------------
Computers - Micro - 0.7%
      53,000    Dell Computer Corp.*                                   4,452,000
- --------------------------------------------------------------------------------
Containers - Paper and Plastic - 0.3%
      31,575    Sealed Air Corp.*                                      1,949,756
- --------------------------------------------------------------------------------
Cruise Lines - 1.2%
      77,025    Carnival Corp. - Class A                               4,265,260
      60,375    Royal Caribbean Cruises, Ltd.                          3,218,742
- --------------------------------------------------------------------------------
                                                                       7,484,002
- --------------------------------------------------------------------------------
Data Processing and Management - 0.7%
      83,775    Applied Graphics Technologies, Inc.*                   4,461,019
- --------------------------------------------------------------------------------
Diversified Financial Services - 0.8%
      69,425    Associates First Capital Corp. - Class A               4,937,853
- --------------------------------------------------------------------------------
Diversified Operations - 8.8%
     573,550    CBS Corp.                                             16,883,878
     111,100    General Electric Co.                                   8,151,962
     105,775    Minnesota Mining and Manufacturing Co.                 8,680,161
     283,890    Siebe PLC**                                            5,581,996
     140,000    Tyco International, Ltd.                               6,308,750
     123,700    Unilever N.V. - N.Y. Shares                            7,723,519
- --------------------------------------------------------------------------------
                                                                      53,330,266
- --------------------------------------------------------------------------------
Electronic Components - 0.9%
      90,078    Philips Electronics N.V.**                             5,403,186
- --------------------------------------------------------------------------------
Electronic Components - Semiconductors - 2.7%
      75,000    Intel Corp.                                            5,268,750
     244,950    Texas Instruments, Inc.                               11,022,750
- --------------------------------------------------------------------------------
                                                                      16,291,500
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

                 JANUS ASPEN GROWTH PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Electronic Safety Devices - 0.4%
      30,675    Pittway Corp. - Class A                             $  2,135,747
- --------------------------------------------------------------------------------
Fiber Optics - 0.5%
      52,050    CIENA Corp.*                                           3,181,556
- --------------------------------------------------------------------------------
Finance - Consumer Loans - 0.8%
      25,650    Household International, Inc.                          3,271,978
      11,100    SLM Holding Corp.                                      1,544,288
- --------------------------------------------------------------------------------
                                                                       4,816,266
- --------------------------------------------------------------------------------
Finance - Investment Bankers/Brokers - 3.0%
     298,087    Charles Schwab Corp.                                  12,501,024
     100,000    Morgan Stanley, Dean Witter, Discover and Co.          5,912,500
- --------------------------------------------------------------------------------
                                                                      18,413,524
- --------------------------------------------------------------------------------
Food - Wholesale - 0.6%
      98,725    J.P. Foodservice, Inc.*                                3,646,655
- --------------------------------------------------------------------------------
Human Resources - 0.7%
     101,950    Robert Half International, Inc.*                       4,078,000
- --------------------------------------------------------------------------------
Instruments - Scientific - 1.1%
     134,225    Dionex Corp.*                                          6,744,806
- --------------------------------------------------------------------------------
Internet Software - 0.7%
      45,100    America Online, Inc.*                                  4,022,356
- --------------------------------------------------------------------------------
Life and Health Insurance -  2.0%
       4,250    Schweizerishe Lebensversicherungs-und
                  Rentenanstalt                                        3,342,187
     166,500    UNUM Corp.                                             9,053,437
- --------------------------------------------------------------------------------
                                                                      12,395,624
- --------------------------------------------------------------------------------
Medical - Drugs - 8.4%
       66,825    Bristol-Myers Squibb Co.                              6,323,316
       96,100    Eli Lilly and Co.                                     6,690,962
       55,762    Glaxo Wellcome PLC**                                  1,331,745
      150,150    Pfizer, Inc.                                         11,195,559
      114,825    Schering-Plough Corp.                                 7,133,503
      592,000    SmithKline Beecham PLC**                              6,112,332
       98,200    Warner-Lambert Co.                                   12,176,800
- --------------------------------------------------------------------------------
                                                                      50,964,217
- --------------------------------------------------------------------------------
Medical - Wholesale Drug Distributors - 0.9%
      68,875    Cardinal Health, Inc.                                  5,174,234
- --------------------------------------------------------------------------------
Money Center Banks - 4.8%
     208,525    Bank of New York Co., Inc.                            12,055,352
      82,700    BankAmerica Corp.                                      6,037,100
     305,027    Barclays PLC**                                         8,134,606
     220,256    Lloyds TSB Group PLC**                                 2,870,498
- --------------------------------------------------------------------------------
                                                                      29,097,556
- --------------------------------------------------------------------------------
Multimedia - 2.2%
     117,650    Meredith Corp.                                         4,198,634
      90,000    Time Warner, Inc.                                      5,580,000
      40,000    Walt Disney Co. (The)                                  3,962,500
- --------------------------------------------------------------------------------
                                                                      13,741,134
- --------------------------------------------------------------------------------
Networking Products - 3.3%
     363,225    Cisco Systems, Inc.*                                  20,249,794
- --------------------------------------------------------------------------------
Oil - Field Services - 1.9%
     222,075    Halliburton Co.                                       11,534,020
- --------------------------------------------------------------------------------
Oil and Gas Drilling - 3.3%
     120,000    Diamond Offshore Drilling, Inc.                        5,775,000
     171,400    Santa Fe International Corp.                           6,973,837
     150,000    Transocean Offshore, Inc.                              7,228,125
- --------------------------------------------------------------------------------
                                                                      19,976,962
- --------------------------------------------------------------------------------
Oil Companies - Exploration and Production - 2.2%
     198,900    Burlington Resources, Inc.                          $  8,913,206
     146,950    Pioneer Natural Resources Co.                          4,252,366
- --------------------------------------------------------------------------------
                                                                      13,165,572
- --------------------------------------------------------------------------------
Oil Companies - Integrated - 0.6%
      64,500    Royal Dutch Petroleum Co. - N.Y. Shares                3,495,094
- --------------------------------------------------------------------------------
Oil Field Machinery and Equipment - 5.2%
     279,500    Schlumberger, Ltd.                                    22,499,750
     145,000    Smith International, Inc.*                             8,899,375
- --------------------------------------------------------------------------------
                                                                      31,399,125
- --------------------------------------------------------------------------------
Pharmacy Services - 0.8%
     162,750    Omnicare, Inc.                                         5,045,250
- --------------------------------------------------------------------------------
Publishing - Books - 2.0%
     158,900    Elsevier N.V.**                                        2,570,960
      72,032    Wolters Kluwer N.V.**                                  9,305,904
- --------------------------------------------------------------------------------
                                                                      11,876,864
- --------------------------------------------------------------------------------
Retail - Consumer Electronics - 0.5%
     100,000    CompUSA, Inc.*                                         3,100,000
- --------------------------------------------------------------------------------
Retail - Discount - 0.9%
     140,000    Wal-Mart Stores, Inc.                                  5,521,250
- --------------------------------------------------------------------------------
Retail - Hypermarkets - 1.2%
     169,625    Costco Companies, Inc.*                                7,569,516
- --------------------------------------------------------------------------------
Retail - Major Department Stores - 1.3%
     116,675    Dayton Hudson Corp.                                    7,875,563
- --------------------------------------------------------------------------------
Television - 0.6%
      50,725    Univision Communications, Inc.*                        3,541,239
- --------------------------------------------------------------------------------
Total Common Stock (cost $480,955,544)                               555,510,601
- --------------------------------------------------------------------------------
U.S. Government Agencies - 9.0%
 $25,000,000    Fannie Mae
                  5.56%, 3/30/98                                      24,666,498
  29,900,000    Freddie Mac
                  6.00%, 1/2/98                                       29,895,017
- --------------------------------------------------------------------------------
Total U.S. Government Agencies (amortized cost $54,555,239)           54,561,515
- --------------------------------------------------------------------------------
Total Investments (total cost $535,510,783) - 100.3%                 610,072,116
- --------------------------------------------------------------------------------
Liabilities, net of Cash, Receivables and Other Assets  - (0.3%)     (1,779,062)
- --------------------------------------------------------------------------------
Net Assets - 100%                                                   $608,293,054
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

                 JANUS ASPEN GROWTH PORTFOLIO December 31, 1997

                       Summary of Investments by Country
                               December 31, 1997

Country                       % of Investment Securities    Market Value
- --------------------------------------------------------------------------------
Netherlands                                4.1%             $ 25,003,569
Sweden                                     0.2%                1,401,186
Switzerland                                0.5%                3,342,186
United Kingdom                             4.5%               27,278,052
United States++                           90.7%              553,047,123
- --------------------------------------------------------------------------------
Total                                    100.0%             $610,072,116
================================================================================
++ Includes Short-Term Securities (81.7% excluding Short-Term Securities)

                           Forward Currency Contracts
                           Open at December 31, 1997

Currency Sold and               Currency           Currency         Unrealized
Settlement Date               Units Sold     Value in $ U.S.        Gain/(Loss)
- --------------------------------------------------------------------------------
British Pound 2/11/98            120,000        $   197,472          $   1,932
British Pound 2/18/98            245,000            403,025             10,299
Dutch Guilder 3/5/98          23,000,000         11,397,988           (148,294)
- --------------------------------------------------------------------------------
Total                                           $11,998,485         ($ 136,063)
================================================================================

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

    JANUS ASPEN AGGRESSIVE GROWTH PORTFOLIO Portfolio Manager, James P. Goff

Market Review

The past year was a difficult period for small and mid-cap stocks and, until the
most recent quarter, I had been extremely dissatisfied with our results. Smaller
stocks  underperformed  during  the  first  half of the year  because  investors
focused on owning the largest,  most liquid stocks. After May, investor interest
broadened,  and small and midsize stocks bounced back. As a result,  we regained
some lost ground in the final quarter even as monetary  problems in Asia spilled
over to affect the U.S.  equity market.  Despite our best efforts,  we could not
keep up with the Portfolio's benchmark, the S&P MidCap 400, primarily because we
were  underweighted in the two sectors that drove the market higher:  energy and
technology.

Portfolio Strategy

First and foremost, I look for "all-weather" performers, companies I believe can
consistently  deliver  rapid  earnings  growth  and  can do so in  any  economic
environment.   That's  why  I  generally  underweight  certain  areas,  such  as
technology and energy stocks, which tend to be more cyclical in nature. However,
toward  the end of the  year I took  advantage  of  market  dips to add  several
positions  in the  technology  sector  that meet our  criteria  for  growth  and
predictability.  While our technology  holdings now account for nearly 8% of the
Portfolio,  it is still significantly less than the 25% technology  weighting in
the Index.

In spite of terrific earnings gains for the majority of our individual holdings,
the sectors most widely  represented in the Portfolio - restaurants,  retail and
wireless  communications  did not  appreciate  at anything  near the rate of the
top-performing  sectors  of our  benchmark.  On  average,  our top 20  positions
delivered  earnings  growth in excess of 35%, but the market simply hasn't taken
notice.

- --------------------------------------------------------------------------------
Portfolio Profile                 December 31, 1997      December 31, 1996
Equities                                 97.0%                  94.4%
  Foreign                                13.6%                  14.7%
Number of Stocks                           68                     59
Top 10 Equities                          41.5%                  45.8%
Cash & Cash Equivalents                   3.0%                   5.6%
- --------------------------------------------------------------------------------

Stock Highlights

We've had a number of standouts,  including  Chancellor Media Corp. and Paychex,
Inc., both up approximately 40%. Another excellent  performer was Sofamor Danek,
a leader in  surgical  implants  for the spine.  Legal  issues  surrounding  the
company  were  resolved  during the year,  and the Food and Drug  Administration
recently  approved new applications for its products.  With global demand on the
increase, Sofamor Danek appears to be headed toward dominance in this field.

Other top holdings - Papa John's, Omnicare and Insignia Financial Group - met or
exceeded earnings estimates, only to have their stock prices decline.  Fastenal,
a  distributor  of nuts and bolts,  also  proved a  disappointment.  The company
introduced a variety of new products and dramatically increased its sales force,
although the additional labor costs temporarily slowed earnings. We have trimmed
our holdings slightly but still believe in the company's potential.

We expect that the technology  positions  added during the year (Cadence  Design
Systems,  Sipex Corp.  and AOL, among others) should perform well going forward.
Cadence,  a leader in  semiconductor  design,  has a history of growing earnings
even during down cycles in its industry. Sipex Corp., which is growing at 50% to
100% annually, has pioneered new applications for analog semiconductors used for
backlighting in cellular phones and other purposes.  For a small company,  it is
extremely  well-diversified;  no  single  customer  contributes  more than 2% of
revenues.  America Online, Inc., the dominant franchise in on-line services, now
has more  than 10  million  subscribers  who  typically  tap  into  its  content
approximately 20 hours each month.

The Outlook

Looking ahead,  the strength of corporate  earnings is the overriding  wild card
for equities.  Estimates vary, but many experts predict that the S&P 500 Index's
earnings will increase by only 5% next year versus the recent five-year  average
of 20%.  We've already begun to see a contraction  in earnings  stemming in part
from the economic  slowdown and declining  currencies in the Far East,  and this
trend could, in all likelihood, persist.

In a less robust  economic  environment,  companies that can continue to deliver
earnings  well in excess of  expectations  should be awarded a premium.  The key
will be owning stocks that can deliver excellent growth when earnings come under
pressure.  I believe this plays to our  strengths  because many of our companies
have exceeded earnings  estimates for some time now, and I'm confident they will
continue to do so. With a boost from the recent  rally in bonds and a market now
compelled to selectively  look for earnings growth, I believe our companies will
be rewarded going forward.

Thank  you for your  continued  investment  in  Janus  Aspen  Aggressive  Growth
Portfolio.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

    JANUS ASPEN AGGRESSIVE GROWTH PORTFOLIO Portfolio Manager, James P. Goff

- --------------------------------------------------------------------------------
Average Annual Total Return(1)
For the Periods Ended December 31, 1997
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 9/13/93)
  1 Year                                                12.66%
  From Inception                                        19.26%
- --------------------------------------------------------------------------------
S&P MidCap 400 Index
  1 Year                                                32.25%
  From Inception Date
    of Institutional Shares                             18.01%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                   --
  From Inception                                        27.11%
- --------------------------------------------------------------------------------
Note: Performance of the Retirement  Shares is lower from the performance  shown
      on this graph for the  Institutional  Shares,  based upon the higher  fees
      paid by shareholders investing in this class.
- --------------------------------------------------------------------------------

Performance Overview(1)          Source - Lipper Analytical Services, Inc. 1997.

GRAPHIC

A graphic comparison of the change in value of a hypothetical $10,000 investment
in Janus Aspen Aggressive  Growth  Portfolio - Institutional  Shares and the S&P
MidCap 400 Index. Janus Aspen Aggressive Growth Portfolio - Institutional Shares
is represented by a solid black line. The S&P MidCap 400 Index is represented by
a dashed black line. The "y" axis reflects the value of the investment.  The "x"
axis  reflects the  computation  periods  from  inception,  September  13, 1993,
through December 31, 1997. The upper right quadrant reflects the ending value of
the  hypothetical  investment  in Janus  Aspen  Aggressive  Growth  Portfolio  -
Institutional  Shares  ($21,292)  as  compared  to  the  S&P  MidCap  400  Index
($20,357).

(1)   All returns reflect reinvested dividends.  The Portfolio's  securities may
      differ  significantly  from the securities in the Index.  Index returns do
      not include taxes or dividends and interest payments or operating expenses
      necessary to maintain a portfolio  consisting of the same  securities that
      are in the Index. These returns do not reflect the charges and expenses of
      any particular insurance product or qualified plan.  Investment return and
      principal value will fluctuate so that shares, when redeemed, may be worth
      more or less than their original cost.  The advisor  voluntarily  waives a
      portion of the Portfolio's expenses.  Without such waiver, the Portfolio's
      total returns for each class would have been lower.  Past performance does
      not guarantee future results.

           JANUS ASPEN AGGRESSIVE GROWTH PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Common Stock - 96.7%
- --------------------------------------------------------------------------------
Advertising Sales - 1.2%
     160,512    Outdoor Systems, Inc.*                              $  6,159,648
- --------------------------------------------------------------------------------
Advertising Services - 0.4%
      49,275    Snyder Communications, Inc.*                           1,798,538
- --------------------------------------------------------------------------------
Aerospace and Defense - 0.7%
     124,650    OEA, Inc.                                              3,607,059
- --------------------------------------------------------------------------------
Airlines - 0.9%
     172,050    Ryanair Holdings PLC (ADR)*                            4,322,756
- --------------------------------------------------------------------------------
Cellular Telecommunications - 1.6%
     791,246    PriCellular Corp. - Class A*                           8,258,630
- --------------------------------------------------------------------------------
Circuit Boards - 0.4%
      30,450    Sanmina Corp.*                                         2,062,988
- --------------------------------------------------------------------------------
Circuits - 4.0%
     283,550    Maxim Integrated Products, Inc.*                       9,782,475
     256,850    SIPEX Corp.*                                           7,769,712
      70,175    Vitesse Semiconductor Corp.*                           2,649,106
- --------------------------------------------------------------------------------
                                                                      20,201,293
- --------------------------------------------------------------------------------
Commercial Banks - 2.5%
       7,750    First Empire State Corp.                               3,603,750
      44,250    Northern Trust Corp.                                   3,086,437
      72,900    Regions Financial Corp.                                3,075,468
      49,125    Star Banc Corp.                                        2,818,547
- --------------------------------------------------------------------------------
                                                                      12,584,202
- --------------------------------------------------------------------------------
Commercial Services - 6.2%
     564,137    Paychex, Inc.                                         28,559,435
     158,550    Profit Recovery Group International, Inc.*             2,814,263
- --------------------------------------------------------------------------------
                                                                      31,373,698
- --------------------------------------------------------------------------------
Computer Services - 1.5%
   1,266,049    Capita Group PLC**                                     7,728,513
- --------------------------------------------------------------------------------
Computer Software - 2.5%
     512,225    Cadence Design Systems, Inc.*                       $ 12,549,513
- --------------------------------------------------------------------------------
Containers - Paper and Plastic - 1.5%
     120,525    Sealed Air Corp.*                                      7,442,419
- --------------------------------------------------------------------------------
Cruise Lines - 2.0%
     193,250    Royal Caribbean Cruises, Ltd.                         10,302,641
- --------------------------------------------------------------------------------
Diversified Financial Services - 0.4%
     125,175    American Capital Strategies, Ltd.                      2,268,797
- --------------------------------------------------------------------------------
Electric - Generation - 3.1%
     341,575    AES Corp.*                                            15,925,934
- --------------------------------------------------------------------------------
Electric Products - 1.6%
     327,600    Littelfuse, Inc.*                                      8,149,050
- --------------------------------------------------------------------------------
Electronic Connectors - 1.3%
     283,575    Berg Electronics Corp.*                                6,451,331
- --------------------------------------------------------------------------------
Finance - Investment Bankers/Brokers - 2.4%
     292,425    Charles Schwab Corp.                                  12,263,574
- --------------------------------------------------------------------------------
Finance - Mortgage Loan Banker - 0.8%
     179,900    Capital Trust - Class A*                               2,023,875
      35,825    Federal Agricultural Mortgage Corp. - Class C*         2,185,325
- --------------------------------------------------------------------------------
                                                                       4,209,200
- --------------------------------------------------------------------------------
Finance - Other Services - 1.4%
      61,600    HealthCare Financial Partners, Inc.*                   2,186,800
     216,825    Medallion Financial Corp.                              4,770,150
- --------------------------------------------------------------------------------
                                                                       6,956,950
- --------------------------------------------------------------------------------
Food - Retail - 0.3%
      23,000    Quality Food Centers, Inc.*                            1,541,000
- --------------------------------------------------------------------------------
Food - Wholesale - 1.2%
     163,775    J.P. Foodservice, Inc.*                                6,049,439
- --------------------------------------------------------------------------------
Golf - 0.7%
     113,075    Family Golf Centers, Inc.*                             3,547,728
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

           JANUS ASPEN AGGRESSIVE GROWTH PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Health Care Cost - 1.8%
     148,900    AmeriPath, Inc.*                                    $  2,531,300
     157,400    Pediatrix Medical Group, Inc.*                         6,728,850
- --------------------------------------------------------------------------------
                                                                       9,260,150
- --------------------------------------------------------------------------------
Human Resources - 0.3%
      40,225    Robert Half International, Inc.*                       1,609,000
- --------------------------------------------------------------------------------
Independent Power Producer - 1.0%
     260,200    Trigen Energy Corp.                                    5,187,737
- --------------------------------------------------------------------------------
Internet Software - 1.0%
      57,400    America Online, Inc.*                                  5,119,363
- --------------------------------------------------------------------------------
Investment Management and Advisory Services - 1.3%
     769,778    Amvescap PLC**                                         6,596,035
- --------------------------------------------------------------------------------
Life and Health Insurance - 1.2%
      54,350    Protective Life Corp.                                  3,247,412
      75,725    UICI*                                                  2,640,910
- --------------------------------------------------------------------------------
                                                                       5,888,322
- --------------------------------------------------------------------------------
Medical Instruments - 1.2%
      96,275    Sofamor Danek Group, Inc.*                             6,263,892
- --------------------------------------------------------------------------------
Oil - Field Services - 0.2%
      44,250    Hanover Compressor Co.*                                  904,359
- --------------------------------------------------------------------------------
Pharmacy Services - 5.7%
     933,025    Omnicare, Inc.                                        28,923,775
- --------------------------------------------------------------------------------
Property and Casualty Insurance - 1.6%
      68,975    Progressive Corp.                                      8,268,378
- --------------------------------------------------------------------------------
Radio - 8.3%
     143,275    Chancellor Media Corp.*                               10,691,896
     249,500    Clear Channel Communications, Inc.*                   19,819,656
     250,000    Heftel Broadcasting Corp.*                            11,687,500
- --------------------------------------------------------------------------------
                                                                      42,199,052
- --------------------------------------------------------------------------------
Real Estate Investment and Management - 3.1%
     477,600    Insignia Financial Group, Inc. - Class A*             10,984,800
     150,650    Security Capital Group, Inc. - Class B*                4,896,126
- --------------------------------------------------------------------------------
                                                                      15,880,926
- --------------------------------------------------------------------------------
Real Estate Investment Trusts - 0.6%
      66,800    Vornado Realty Trust                                   3,135,425
- --------------------------------------------------------------------------------
Rental - Auto Equipment - 1.3%
     169,225    Coinmach Laundry Corp.*                                4,146,012
     108,550    Rental Service Corp.*                                  2,666,259
- --------------------------------------------------------------------------------
                                                                       6,812,271
- --------------------------------------------------------------------------------
Resorts and Theme Parks - 0.7%
      83,575    Premier Parks, Inc.*                                   3,384,788
- --------------------------------------------------------------------------------
Retail - Auto Parts - 0.5%
      90,525    O'Reilly Automotive, Inc.*                             2,376,282
- --------------------------------------------------------------------------------
Retail - Building Products - 3.8%
     498,725    Fastenal Co.                                          19,076,232
- --------------------------------------------------------------------------------
Retail - Catalog Shopping - 2.1%
      348,775    Barnett, Inc.*                                        7,673,050
       70,575    MSC Industrial Direct Co., Inc. - Class A*            2,990,616
- --------------------------------------------------------------------------------
                                                                      10,663,666
- --------------------------------------------------------------------------------
Retail - Consumer Electronics - 0.8%
     132,250    CompUSA, Inc.*                                         4,099,750
- --------------------------------------------------------------------------------
Retail - Pet Food and Supplies - 2.7%
     575,820    Petco Animal Supplies, Inc.*                          13,819,680
- --------------------------------------------------------------------------------
Retail - Pubs - 5.1%
   4,746,992    Wetherspoon (J.D.) PLC**                              25,775,312
- --------------------------------------------------------------------------------
Retail - Regional Department Stores - 0.4%
      61,070    Fred Meyer, Inc.*                                      2,221,421
- --------------------------------------------------------------------------------
Retail - Restaurants - 7.1%
     329,505    Papa John's International, Inc.*                    $ 11,491,486
   1,994,581    PizzaExpress PLC**                                    24,482,851
- --------------------------------------------------------------------------------
                                                                      35,974,337
- --------------------------------------------------------------------------------
Schools - 4.0%
     416,675    Apollo Group, Inc. - Class A*                         19,687,894
      28,175    DeVry, Inc.*                                             898,078
- --------------------------------------------------------------------------------
                                                                      20,585,972
- --------------------------------------------------------------------------------
Television - 1.4%
     100,350    Univision Communications, Inc.*                        7,005,684
- --------------------------------------------------------------------------------
Theaters - 0.6%
     109,275    Regal Cinemas, Inc.*                                   3,046,041
- --------------------------------------------------------------------------------
Water Treatment Services - 0.3%
      33,800    Culligan Water Technologies, Inc.*                     1,698,450
- --------------------------------------------------------------------------------
Total Common Stock (cost $378,617,834)                               491,531,201
- --------------------------------------------------------------------------------
Warrants - 0.3%
      65,700    Littlefuse, Inc. - exp. 12/31/01*
                  (cost $677,514)                                      1,445,400
- --------------------------------------------------------------------------------
U.S. Government Agency - 4.2%
                Freddie Mac
 $21,300,000      6.00%, 1/2/98 (amortized cost $21,296,450)          21,296,450
- --------------------------------------------------------------------------------
Total Investments (total cost $400,591,798) - 101.2%                 514,273,051
- --------------------------------------------------------------------------------
Liabilities, net of Cash, Receivables and Other Assets - (1.2%)      (6,062,157)
- --------------------------------------------------------------------------------
Net Assets - 100%                                                   $508,210,894
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

           JANUS ASPEN AGGRESSIVE GROWTH PORTFOLIO December 31, 1997

                       Summary of Investments by Country
                               December 31, 1997

Country                       % of Investment Securities    Market Value
- --------------------------------------------------------------------------------
Ireland                                    0.8%             $  4,322,691
United Kingdom                            12.6%               64,582,710
United States ++                          86.6%              445,367,650
- --------------------------------------------------------------------------------
Total                                    100.0%             $514,273,051
================================================================================
++ Includes Short-Term Securities (82.5% excluding Short-Term Securities)

                           Forward Currency Contracts
                           Open at December 31, 1997

Currency Sold and               Currency            Currency        Unrealized
Settlement Date               Units Sold      Value in $ U.S.       Gain/(Loss)
- --------------------------------------------------------------------------------
British Pound 1/20/98          1,000,000         $ 1,647,400         $  34,600
British Pound 2/11/98            100,000             164,560             1,610
British Pound 2/25/98          4,015,000           6,602,668          (272,659)
British Pound 2/26/98          5,108,000           8,399,595           (46,739)
British Pound 3/4/98           2,800,000           4,602,920          (131,320)
British Pound 5/6/98           9,600,000          15,733,440           242,115
British Pound 5/11/98          4,500,000           7,373,250           164,250
- --------------------------------------------------------------------------------
Total                                            $44,523,833        ($   8,143)
================================================================================

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

JANUS ASPEN CAPITAL APPRECIATION PORTFOLIO Portfolio Manager, Scott W. Schoelzel

Market Review

The   Portfolio   opened  in  the  midst  of  a  market   rally   sparked  by  a
best-of-all-worlds  scenario:  moderate economic growth, low inflation and solid
corporate earnings.  Because of high demand from investors seeking quality, many
large stocks were trading at  unprecedented  levels.  Therefore,  I was somewhat
judicious  in putting  capital to work.  As it turned out,  large  stocks took a
breather  in late  summer as  investors  (for the first  time in many  quarters)
favored smaller companies.  Whenever possible, I used the temporary downturns in
the various sectors of the market to build positions at lower prices.

I continued to use this approach toward year-end,  when the monetary crisis that
began in Southeast Asia impacted the U.S. market. The increased  volatility left
many indexes  substantially  below their peaks. This instability,  combined with
steady  cash  inflows  during the  period,  allowed  us to add some  world-class
companies at more reasonable valuations.  We stressed those with little overseas
exposure and/or strong, defensible franchises.

Portfolio Strategy

The Portfolio is fairly focused and employs a "barbell" approach. At one end are
very large,  multinational companies with secure global market share and diverse
sources of revenue,  such as Microsoft and Pfizer.  At the other end is a select
group of faster-growing, small- and medium-capitalization companies like Veritas
Software Corp. and America Online. Even though the short-term risk may be higher
with some of these companies,  the wide variety of market capitalizations should
help to mitigate volatility while increasing the Portfolio's long-term potential
for capital appreciation.

Regardless of its size,  each company was chosen for its highly  dynamic  growth
prospects,  historical earnings predictability,  and competitive position in its
industry.  In short, the Portfolio  comprises companies that are or soon will be
considered  "best of category."  The majority  belong to industries  that should
benefit greatly from  fundamental,  long-term change in economic and demographic
trends:  pharmaceuticals,   healthcare,   technology,   tele-communications  and
financial services.

- --------------------------------------------------------------------------------
Portfolio Profile                     December 31, 1997
Equities                                    81.0%
  Foreign                                    7.2%
Top 10 Equities                             42.4%
Number of Stocks                              33
Cash & Cash Equivalents                     19.0%
- --------------------------------------------------------------------------------

Stock Highlights

The Portfolio has a substantial weighting in large-capitalization,  high-quality
pharmaceutical manufacturers,  including Eli Lilly and Pfizer. All have launched
or soon will launch new products with exceptional sales potential. For instance,
Eli Lilly has received approval to introduce Evista,  which treats  osteoporosis
and can be used for hormone replacement therapy for women.

Among our financial  stock  holdings  were Merrill  Lynch,  which  dominates the
full-service brokerage business at home and abroad and has enormous market share
in international investment banking.

In the  technology  sector,  we owned smaller  companies  like Dell Computer and
Saville  Systems  and large  concerns  like  Intel.  Despite  their  fundamental
strengths,  nearly all of them were  affected  by the  problems  in Asia,  which
resulted in a global  down-turn  for  technology.  For  example,  Dell  declined
approximately 20%, in spite of reporting record earnings and deriving only 7% of
its  sales  from the Far  East.  As I  mentioned  earlier,  we tried to use such
volatility  to  advantage.  We added to our  positions in several  semiconductor
companies and acquired shares of Cisco Systems,  a leading  computer  networking
company that has limited exposure in Asia.

During the period, I sold Oxford Health Plans, Inc. We had owned Oxford in other
portfolios for a number of years and had experienced  outstanding  gains. In the
fourth quarter,  however, Oxford announced problems in converting its management
information systems that ultimately resulted in a major charge against earnings.
We truly believe we did our homework,  but every so often developments like this
can  take us by  surprise.  It's  little  solace,  but  much  of the  investment
community was caught off guard as well.

The Outlook

I remain  cautiously  optimistic as we head into 1998. The recent  volatility in
global  markets has  certainly  been  unsettling  and may  continue to be so for
awhile.  Deflation elsewhere in the world and perhaps in the U.S. is a very real
possibility  but is not necessarily  bad.  Interest rates could trend even lower
than their current levels, which would help to support the price of equities.

Going forward, I believe that earnings for the S&P 500 and many other stocks may
well slow  down.  If I am  correct,  investors  will be willing to pay a sizable
premium for stocks that can deliver  high,  sustainable  earnings  growth.  I am
confident  that the stocks in the Portfolio,  especially  the technology  stocks
that were recently  downtrodden,  are fundamentally sound investments.  Based on
our  earnings  estimates,  I believe  they will show  gains  once the market has
worked its way through this period of adjustment.

Thank you for your  continued  investment  in Janus Aspen  Capital  Appreciation
Portfolio.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

JANUS ASPEN CAPITAL APPRECIATION PORTFOLIO Portfolio Manager, Scott W. Schoelzel

- --------------------------------------------------------------------------------
Cumulative Total Return(1)
For the Periods Ended December 31, 1997
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 5/1/97)
  1 Year                                                   --
  From Inception                                        26.60%
- --------------------------------------------------------------------------------
S&P 500 Index
  1 Year                                                   --
  From Inception Date
    of Institutional Shares                             22.55%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                   --
  From Inception                                        26.20%
- --------------------------------------------------------------------------------
Note: Performance of the Retirement  Shares is lower from the performance  shown
      on this graph for the  Institutional  Shares,  based upon the higher  fees
      paid by shareholders investing in this class.
- --------------------------------------------------------------------------------

Performance Overview(1)          Source - Lipper Analytical Services, Inc. 1997.

GRAPHIC

A graphic comparison of the change in value of a hypothetical $10,000 investment
in Janus Aspen Capital Appreciation Portfolio - Institutional Shares and the S&P
500 Index. Janus Aspen Capital Appreciation  Portfolio - Institutional Shares is
represented  by a solid black line. The S&P 500 Index is represented by a dashed
black line.  The "y" axis  reflects  the value of the  investment.  The "x" axis
reflects the computation  periods from inception,  May 1, 1997, through December
31, 1997. The upper right quadrant reflects the ending value of the hypothetical
investment in Janus Aspen Capital Appreciation  Portfolio - Institutional Shares
($12,660) as compared to the S&P 500 Index ($12,255).

(1)   All returns reflect reinvested dividends.  The Portfolio's  securities may
      differ  significantly  from the securities in the Index.  Index returns do
      not include taxes or dividends and interest payments or operating expenses
      necessary to maintain a portfolio  consisting of the same  securities that
      are in the Index. These returns do not reflect the charges and expenses of
      any particular insurance product or qualified plan.  Investment return and
      principal value will fluctuate so that shares, when redeemed, may be worth
      more or less than their original cost.  The advisor  voluntarily  waives a
      portion of the Portfolio's expenses.  Without such waiver, the Portfolio's
      total returns for each class would have been lower.  Past performance does
      not guarantee future results.

          JANUS ASPEN CAPITAL APPRECIATION PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Common Stock - 81.0%
- --------------------------------------------------------------------------------
Computer Software - 5.8%
       5,300    Accelr8 Technology Corp.*                           $    143,100
       1,960    Microsoft Corp.*                                         253,330
- --------------------------------------------------------------------------------
                                                                         396,430
- --------------------------------------------------------------------------------
Computers - Integrated Systems - 3.7%
       6,100    Saville Systems Ireland PLC (ADR)*                       253,150
- --------------------------------------------------------------------------------
Computers - Memory Devices - 6.7%
       9,000    VERITAS Software Corp.*                                  459,000
- --------------------------------------------------------------------------------
Computers - Micro - 0.7%
         534    Dell Computer Corp.*                                      44,856
- --------------------------------------------------------------------------------
Cosmetics and Toiletries - 2.6%
       1,000    Gillette Co.                                             100,437
       1,000    Procter & Gamble Co.                                      79,813
- --------------------------------------------------------------------------------
                                                                         180,250
- --------------------------------------------------------------------------------
Data Processing and Management - 2.1%
       2,450    LHS Group, Inc.*                                         146,387
- --------------------------------------------------------------------------------
Diversified Operations - 3.0%
       5,175    CBS Corp.                                                152,339
         750    General Electric Co.                                      55,031
- --------------------------------------------------------------------------------
                                                                         207,370
- --------------------------------------------------------------------------------
Educational Software - 3.5%
       2,950    CBT Group PLC (ADR)*                                     242,269
- --------------------------------------------------------------------------------
Electronic Components - Semiconductors - 6.1%
       2,300    Intel Corp.                                              161,575
       5,600    Texas Instruments, Inc.                                  252,000
- --------------------------------------------------------------------------------
                                                                         413,575
- --------------------------------------------------------------------------------
Finance - Credit Card - 1.7%
       1,275    American Express Co.                                     113,794
- --------------------------------------------------------------------------------
Finance - Investment Bankers/Brokers - 3.8%
       1,770    Merrill Lynch & Co., Inc.                           $    129,099
       2,225    Morgan Stanley, Dean Witter, Discover and Co.            131,553
- --------------------------------------------------------------------------------
                                                                         260,652
- --------------------------------------------------------------------------------
Internet Content - 2.0%
       5,400    At Home Corp.*                                           135,675
- --------------------------------------------------------------------------------
Internet Software - 5.2%
       4,000    America Online, Inc.*                                    356,750
- --------------------------------------------------------------------------------
Marine Services - 1.3%
       6,175    TransCoastal Marine Services, Inc.*                       87,994
- --------------------------------------------------------------------------------
Medical - Biomedical and Genetic - 2.1%
       3,200    Incyte Pharmaceuticals, Inc.*                            144,000
- --------------------------------------------------------------------------------
Medical - Drugs - 8.2%
       3,700    Eli Lilly and Co.                                        257,612
       3,034    Pfizer, Inc.                                             226,223
         608    Warner-Lambert Co.                                        75,392
- --------------------------------------------------------------------------------
                                                                         559,227
- --------------------------------------------------------------------------------
Money Center Banks - 4.9%
       3,710    BankAmerica Corp.                                        270,830
         498    Citicorp                                                  62,966
- --------------------------------------------------------------------------------
                                                                         333,796
- --------------------------------------------------------------------------------
Multi-Line Insurance - 0.8%
         525    American International Group, Inc.                        57,094
- --------------------------------------------------------------------------------
Networking Products - 2.1%
       2,625    Cisco Systems, Inc.*                                     146,344
- --------------------------------------------------------------------------------
Oil - Field Services - 2.6%
       3,375    Halliburton Co.                                          175,289
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

          JANUS ASPEN CAPITAL APPRECIATION PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Radio - 3.0%
       2,675    Chancellor Media Corp.*                             $    199,622
- --------------------------------------------------------------------------------
Retail - Building Products - 0.8%
         950    Home Depot, Inc.                                          55,931
- --------------------------------------------------------------------------------
Schools - 2.0%
       2,950    Apollo Group, Inc. - Class A*                            139,387
- --------------------------------------------------------------------------------
Super-Regional Banks - 4.8%
       2,950    U.S. Bancorp                                             330,216
- --------------------------------------------------------------------------------
Telecommunication Services - 1.5%
       1,750    Qwest Communications International, Inc.*                104,125
- --------------------------------------------------------------------------------
Total Common Stock (cost $5,278,008)                                   5,543,183
- --------------------------------------------------------------------------------
U.S. Government Agency - 20.4%
                Freddie Mac
  $1,400,000      6.00%, 1/2/98 (amortized cost $1,399,767)            1,399,767
- --------------------------------------------------------------------------------
Total Investments (total cost $6,677,775) - 101.4%                     6,942,950
- --------------------------------------------------------------------------------
Liabilities, net of Cash, Receivables and Other Assets - (1.4%)         (96,773)
- --------------------------------------------------------------------------------
Net Assets - 100%                                                   $  6,846,177
- --------------------------------------------------------------------------------

                       Summary of Investments by Country
                               December 31, 1997

Country                       % of Investment Securities    Market Value
- --------------------------------------------------------------------------------
Ireland                                    7.1%             $    495,419
United States++                           92.9%                6,447,531
- --------------------------------------------------------------------------------
Total                                    100.0%             $  6,942,950
================================================================================
++ Includes Short-Term Securities (72.7% excluding Short-Term Securities)

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

JANUS ASPEN INTERNATIONAL GROWTH PORTFOLIO Portfolio Manager, Helen Young Hayes

Market Review

Looking back on the  volatility in the foreign  markets,  especially  during the
final quarter of 1997, I am pleased with the Portfolio's results. Though we lost
ground in November and  December  after the  currency  crisis in Southeast  Asia
expanded to markets  worldwide,  the impact was mitigated by an overweighting in
Europe and an underweighting  in the Far East and Japan.  Early on we determined
that Japan's  government and industry were not taking the necessary  measures to
end the economic  malaise there,  and prices in the emerging markets of Asia had
become excessive, given the structural problems in many of those countries.

Europe, in contrast,  exhibited signs of economic progress.  Interest rates fell
during the year, and businesses achieved productivity gains through cost cutting
and consolidations.  In addition,  unemployment  remained  sufficiently high and
consumer  demand weak enough to keep any  inflationary  pressures under control.
Among  the  biggest  beneficiaries  of this  scenario  were  bank and  financial
services stocks.

- --------------------------------------------------------------------------------
Portfolio Profile                  December 31, 1997      December 31, 1996
Equities                                 91.6%                  70.9%
  Foreign                                90.1%                  70.8%
Number of Stocks                          188                    181
Top 10 Equities                          22.9%                  18.3%
Cash & Fixed-Income Securities            8.4%                  29.1%
- --------------------------------------------------------------------------------

Portfolio Review

We emphasized a number of themes  during the year.  As always,  our primary goal
was to acquire shares of reasonably  priced,  classic growth  companies.  Beyond
that, we stressed owning companies committed to improving shareholder value.

Our research uncovered several good opportunities among Europe's  pharmaceutical
and technology industries. Among the best of the pharmaceuticals was Akzo Nobel,
a Dutch  enterprise that is redefining its core business  (chemicals) and moving
into the rapidly  growing life sciences area.  Sales of its new  antidepressant,
Remeron,  should  help to boost Akzo  Nobel's  pharmaceutical  business  and its
profit margins in the future.

Likewise, we are very optimistic about France's Cap Gemini and Atos, key players
in the growth of information technology infrastructure. Both are benefiting from
Europe's  rebounding  economies as well as the challenges posed by the Year 2000
issue and a single European currency (the Euro).

Our other  technology  holdings,  in Europe and elsewhere,  did not fare so well
after late  October,  when the  turmoil  in Asia  spread to other  markets.  For
instance,   Philips   Electronics,    a   Netherlands-based    manufacturer   of
semiconductors and consumer  electronics with substantial  business in Southeast
Asia, was a major disappointment. We trimmed our position, but opted to keep the
stock  because  most of the  fundamental  reasons  to own it  remain  unchanged.
Enhancing  shareholder  value is a primary  goal of  management,  and Philips is
determined to continue to divest unrelated and underperforming lines of business
in 1998.

Prices of nearly all our  technology  stocks  were  impacted  by the fear that a
global  economic  slowdown  will hurt the demand for products and  services.  We
believe  instead  that demand will  continue to grow in both the  developed  and
developing  regions of the world,  and we viewed the  reduction in prices during
the fourth quarter as a buying opportunity, adding quality, globally competitive
companies like Japan's Sony Corporation.

The Coming Months

Our outlook for the global markets remains generally positive,  though we expect
the increased volatility of the past several months to linger a bit longer. With
global  interest rates having trended  downward since October,  Europe should be
able to  continue  moving in the right  direction.  On the  other  hand,  we are
cautious in our outlook for  Southeast  Asia,  Korea and Japan.  The  continuing
slowdown, and its possible impact on China and Brazil, definitely bear watching.

I believe our emphasis on disciplined, thorough research and high-quality growth
stories  will  serve the  Portfolio  well in this  environment.  We will be more
selective, avoiding commodity-type businesses or those that require long periods
to improve earnings and profits,  and stressing companies with clear competitive
advantages, strong franchises and high margins.

Thank you for your  continued  investment  in Janus Aspen  International  Growth
Portfolio.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

JANUS ASPEN INTERNATIONAL GROWTH PORTFOLIO Portfolio Manager, Helen Young Hayes

- --------------------------------------------------------------------------------
Average Annual Total Return(1)
For the Periods Ended December 31, 1997
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 5/2/94)
  1 Year                                                18.51%
  From Inception                                        19.32%
- --------------------------------------------------------------------------------
Morgan Stanley Capital International EAFE Index(2)
  1 Year                                                 1.78%
  From Inception Date
    of Institutional Shares                              5.08%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                   --
  From Inception                                        10.53%
- --------------------------------------------------------------------------------
Note: Performance of the Retirement  Shares is lower from the performance  shown
      on this graph for the  Institutional  Shares,  based upon the higher  fees
      paid by shareholders investing in this class.
- --------------------------------------------------------------------------------

Performance Overview(1)          Source - Lipper Analytical Services, Inc. 1997.

GRAPHIC

A graphic comparison of the change in value of a hypothetical $10,000 investment
in Janus Aspen  International  Growth  Portfolio - Institutional  Shares and the
Morgan  Stanley  Capital  International  EAFE Index.  Janus Aspen  International
Growth  Portfolio -  Institutional  Shares is represented by a solid black line.
The Morgan Stanley Capital  International  EAFE Index is represented by a dashed
black line.  The "y" axis  reflects  the value of the  investment.  The "x" axis
reflects the computation  periods from inception,  May 2, 1994, through December
31, 1997. The upper right quadrant reflects the ending value of the hypothetical
investment in Janus Aspen International  Growth Portfolio - Institutional Shares
($19,109) as compared to the Morgan  Stanley  Capital  International  EAFE Index
($11,991).

(1)  All returns reflect reinvested  dividends.  The Portfolio's  securities may
     differ significantly from the securities in the Index. Index returns do not
     include  taxes or  dividends  and interest  payments or operating  expenses
     necessary to maintain a portfolio  consisting of the same  securities  that
     are in the Index.  These returns do not reflect the charges and expenses of
     any particular  insurance product or qualified plan.  Investment return and
     principal value will fluctuate so that shares, when redeemed,  may be worth
     more or less than their  original cost.  The advisor  voluntarily  waives a
     portion of the Portfolio's  expenses.  Without such waiver, the Portfolio's
     total returns for each class would have been lower.  Past  performance does
     not guarantee future results.
(2)  Net dividends  reinvested  are the  dividends  that remain to be reinvested
     after foreign tax  obligations  have been met. Such  obligations  vary from
     country to country. EAFE stands for Europe, Australasia,  and the Far East.
     Neither  the U.S.  market nor the  emerging  markets of Latin  America  and
     Eastern Europe are represented in EAFE.

          JANUS ASPEN INTERNATIONAL GROWTH PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Common Stock - 91.2%
- --------------------------------------------------------------------------------
Airlines - 2.2%
      51,517    Deutsche Lufthansa A.G.**,+                         $    988,484
      30,442    KLM Royal Dutch Air Lines N.V.**                       1,126,243
          93    Sairgroup*,**                                            127,524
      17,685    SAS Danmark A/S                                          258,280
      17,577    SAS Norske ASA - Class B                                 245,576
      21,527    SAS Sverige A.B.**                                       312,011
      19,400    Virgin Express Holdings PLC (ADR)*                       402,550
- --------------------------------------------------------------------------------
                                                                       3,460,668
- --------------------------------------------------------------------------------
Airport Development - Maintenance - 0.4%
      62,738    Aeroporti di Roma S.p.A.*,+                              648,956
- --------------------------------------------------------------------------------
Appliances - 2.5%
      56,933    Electrolux A.B. - Class B**                            3,953,699
- --------------------------------------------------------------------------------
Athletic Footwear - 0.3%
       3,982    Adidas A.G.**                                            523,981
- --------------------------------------------------------------------------------
Audio and Video Products - 2.2%
      39,200    Sony Corp.**                                           3,497,279
- --------------------------------------------------------------------------------
Automotive - Cars and Light Trucks - 0.8%
      44,991    Renault S.A.*,**                                       1,266,149
       2,673    Tata Engineering & Locomotive Co., Ltd. (GDR)+            21,250
- --------------------------------------------------------------------------------
                                                                       1,287,399
- --------------------------------------------------------------------------------
Automotive - Truck Parts and Equipment - 0.1%
      13,000    Denso Corp.**                                            234,962
- --------------------------------------------------------------------------------
Brewery - 0.3%
      60,500    Fomento Economico Mexicano, S.A. de C.V.                 486,293
- --------------------------------------------------------------------------------
Broadcast Services and Programming - 0.4%
      16,225    Grupo Televisa S.A. (GDR)*                               627,705
       1,031    Modern Times Group MTG A.B.*,**                            6,172
- --------------------------------------------------------------------------------
                                                                         633,877
- --------------------------------------------------------------------------------
Building - Heavy Construction - 0.2%
       3,395    Compagnie Fransaise d'Etudes et
                   de Construction Technip**                        $    358,357
- --------------------------------------------------------------------------------
Building and Construction - 0.7%
      10,195    Suez Lyonnaise des Eaux**                              1,128,661
- --------------------------------------------------------------------------------
Building and Construction Products - 0.1%
      11,000    Matsushita Electric Works, Ltd.**                         95,600
- --------------------------------------------------------------------------------
Cellular Telecommunications - 0%
       1,315    Millicom International Cellular S.A.*                     49,477
- --------------------------------------------------------------------------------
Chemicals - Diversified - 2.5%
      19,082    Akzo Nobel N.V.**,+                                    3,290,735
      45,190    Imperial Chemical Industries PLC**                       707,122
- --------------------------------------------------------------------------------
                                                                       3,997,857
- --------------------------------------------------------------------------------
Chemicals - Specialty - 0.1%
         122    Clariant A.G.**                                          102,047
       8,083    Victrex PLC**                                             31,254
- --------------------------------------------------------------------------------
                                                                         133,301
- --------------------------------------------------------------------------------
Closed-End Funds - 0.1%
         163    Romania Investment Fund                                  155,986
- --------------------------------------------------------------------------------
Commercial Appliances - 1.7%
      78,800    Groupe Danone (ADR)                                    2,817,100
- --------------------------------------------------------------------------------
Commercial Banks - 4.2%
     527,362    Banca Commerciale Italiana                             1,835,331
       6,075    Banco Rio de La Plata S.A. (ADR)*                         85,050
      16,834    Bankgesellschaft Berlin A.G.**                           370,751
      17,874    Bayerische Vereinsbank A.G.**                          1,170,033
      13,211    BG Bank A/S+                                             889,453
       6,905    Credit Commercial de France**                            473,467
      64,894    Credito Italiano S.p.A.                                  200,849
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

          JANUS ASPEN INTERNATIONAL GROWTH PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Commercial Banks - (continued)
      18,796    Erste Bank Der Oesterreichischen
                  Sparkassen A.G.*,**,+                             $    935,280
     101,951    Merita PLC - Class A                                     557,919
       5,800    Uniao de Bancos Brasileiros S.A. (GDR)*                  186,688
- --------------------------------------------------------------------------------
                                                                       6,704,821
- --------------------------------------------------------------------------------
Commercial Services - 0.8%
      47,393    BTG PLC**                                                526,368
       4,814    Sophus Berendsen A/S - Class B                           794,458
- --------------------------------------------------------------------------------
                                                                       1,320,826
- --------------------------------------------------------------------------------
Computer Services - 3.6%
       5,390    Atos S.A.*,**                                            695,269
      11,387    Cap Gemini S.A.**                                        934,111
     141,400    Capita Group PLC**                                       863,167
       7,559    Delphi Group PLC**                                        84,202
      51,562    Getronics N.V.**                                       1,643,084
      76,154    Logica PLC**                                           1,457,283
       3,863    Misys PLC**                                              116,954
       4,060    WM-Data A.B. - Class B**                                  73,429
- --------------------------------------------------------------------------------
                                                                       5,867,499
- --------------------------------------------------------------------------------
Computer Software - 2.6%
      18,650    Dassault Systemes S.A. (ADR)                             575,819
      21,192    JBA Holdings PLC**                                       360,898
       6,107    Merkantildata A.S.A.                                     210,409
          35    NTT Data Corp.**                                       1,892,385
      35,984    SEMA Group PLC**                                         876,280
       2,518    TT Tieto Oy - Class B                                    283,452
- --------------------------------------------------------------------------------
                                                                       4,199,243
- --------------------------------------------------------------------------------
Computers - Integrated Systems - 0.3%
          94    Dimension Data Holdings, Ltd.*,+                             405
      21,000    Fujitsu, Ltd.**                                          226,117
       6,126    Prosolvia AB*,**                                         244,751
- --------------------------------------------------------------------------------
                                                                         471,273
- --------------------------------------------------------------------------------
Cosmetics and Toiletries - 0.5%
      17,442    Rhone-Poulenc - Class A**                                781,661
- --------------------------------------------------------------------------------
Diversified Operations - 7.5%
      12,419    Amer Group, Ltd.                                         238,323
           9    Barco N.V.                                                 1,652
      43,000    Citic Pacific, Ltd.                                      170,929
     740,480    First Pacific Co., Ltd.                                  358,377
      14,400    Grupo Carso S.A. de C.V. - Series A1                      96,276
      45,444    Hays PLC**                                               606,062
      28,000    Hutchison Whampoa, Ltd.                                  175,626
       1,493    Kinnevik A.B. - Class B**                                 24,744
      18,967    Lagardere S.C.A.**                                       627,413
       7,828    Metra Oy - Class B                                       184,003
      19,500    Quinenco S.A. (ADR)*                                     224,250
     695,991    Rentokil Initial PLC**                                 3,085,468
     211,210    Siebe PLC**                                            4,152,923
      38,000    Swire Pacific, Ltd. - Class A                            208,434
      30,436    TI Group PLC**                                           233,871
      98,283    Tomkins PLC**                                            465,739
     210,951    Williams PLC**                                         1,173,194
- --------------------------------------------------------------------------------
                                                                      12,027,284
- --------------------------------------------------------------------------------
Drug Delivery Systems - 0%
       1,175    Elan Corp. PLC (ADR)*                                     60,145
- --------------------------------------------------------------------------------
Electric - Distribution - 0.1%
       3,466    Unified Energy System (GDR)*                             103,113
- --------------------------------------------------------------------------------
Electric - Integrated - 1.1%
       3,550    Cemig S.A. (ADR)                                    $    156,200
     102,375    Companhia Paranaense de Energia-Copel (ADR)            1,401,258
       5,100    Mosenergo (ADR)+                                         191,250
- --------------------------------------------------------------------------------
                                                                       1,748,708
- --------------------------------------------------------------------------------
Electric Products - 0.3%
      43,000    Hitachi, Ltd.**                                          307,565
       3,203    Siemens A.G.**                                           189,717
- --------------------------------------------------------------------------------
                                                                         497,282
- --------------------------------------------------------------------------------
Electronic Components - 4.2%
     200,673    Electrocomponents PLC**                                1,495,749
      40,683    Philips Electronics N.V.**                             2,440,305
      39,625    Philips Electronics N.V. - N.Y. Shares**               2,397,313
       7,836    Pricer A.B. - Class B*,**                                145,178
      11,000    Tokyo Electron, Ltd.**                                   353,635
- --------------------------------------------------------------------------------
                                                                       6,832,180
- --------------------------------------------------------------------------------
Electronic Components - Semiconductors - 0.5%
       8,000    Rohm Co., Ltd.**                                         806,023
- --------------------------------------------------------------------------------
Electronic Measuring Instruments - 0.4%
       5,884    Simac Techniek N.V.**                                    684,987
- --------------------------------------------------------------------------------
Electronic Parts Distributors - 0.2%
      42,670    Premier Farnell PLC**                                    307,516
- --------------------------------------------------------------------------------
Environmental Monitoring and Detection Devices - 0.2%
      39,563    Munters A.B.*,**,+                                       341,561
- --------------------------------------------------------------------------------
Film Processing - 0.6%
      24,032    GrandVision**,+                                          989,106
- --------------------------------------------------------------------------------
Food - Catering - 0.5%
      67,508    Compass Group PLC**,+                                    831,972
- --------------------------------------------------------------------------------
Food - Dairy Products - 0%
       2,245    Koninklijke Nutricia Verenidge Bedrijven N.V.**           68,107
- --------------------------------------------------------------------------------
Food - Diversified - 0.8%
       2,832    Danone**                                                 506,062
       7,087    Raisio Group PLC*                                        839,432
- --------------------------------------------------------------------------------
                                                                       1,345,494
- --------------------------------------------------------------------------------
Home Furnishings - 0.1%
      11,067    Ekornes A.S.A.                                            90,821
- --------------------------------------------------------------------------------
Human Resources - 1.4%
      12,947    DIS Deutscher Industrie Service A.G.*,**                 540,045
      88,825    Select Appointments Holdings PLC (ADR)*                1,621,056
       5,480    Vedior N.V.**,+                                           98,667
- --------------------------------------------------------------------------------
                                                                       2,259,768
- --------------------------------------------------------------------------------
Investment Companies - 0.4%
      11,601    Investor A.B. - B Shares**                               565,841
- --------------------------------------------------------------------------------
Investment Management and Advisory Services - 0.1%
      14,014    Amvescap PLC**                                           120,082
- --------------------------------------------------------------------------------
Life and Health Insurance - 1.0%
       2,076    Schweizerishe Lebensversicherungs-und
                  Rentenanstalt**                                      1,632,560
         214    Union des Assurances Federales**                          28,102
- --------------------------------------------------------------------------------
                                                                       1,660,662
- --------------------------------------------------------------------------------
Machinery - General Industrial - 2.6%
       3,075    ASM Lithography Holding N.V. (ADR)*                      207,563
     401,345    Powerscreen International PLC**                        4,034,574
- --------------------------------------------------------------------------------
                                                                       4,242,137
- --------------------------------------------------------------------------------
Machinery - Pumps - 1.0%
      55,650    Pfeiffer Vacuum Technology A.G. (ADR)*                 1,551,244
- --------------------------------------------------------------------------------
Medical - Biomedical and Genetic - 0.5%
         479    Ares-Serono Group - Class B**                            791,464
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

          JANUS ASPEN INTERNATIONAL GROWTH PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Medical - Drugs - 2.4%
         731    Novartis A.G.**                                     $  1,187,802
         142    Roche Holding A.G.**                                   1,412,162
       7,324    SmithKline Beecham PLC**                                  75,619
         350    SmithKline Beecham PLC (ADR)**                            18,003
      39,000    Takeda Chemical Industries**                           1,115,819
- --------------------------------------------------------------------------------
                                                                       3,809,405
- --------------------------------------------------------------------------------
Medical - Wholesale Drug Distributors - 0.1%
         327    Gehe A.G.**                                               16,368
       6,375    Grupo Casa Autrey S.A. de C.V. (ADR)                     130,289
- --------------------------------------------------------------------------------
                                                                         146,657
- --------------------------------------------------------------------------------
Medical Products - 0.3%
       1,590    Fresenius Medical Care A.G. (ADR)*                        34,582
      12,670    Ortivus A.B. - B Shares*,**                              423,166
- --------------------------------------------------------------------------------
                                                                         457,748
- --------------------------------------------------------------------------------
Metal Processors and Fabricators - 0.7%
      42,528    Assa Abloy A.B. - Class B**                            1,125,595
- --------------------------------------------------------------------------------
Money Center Banks - 5.8%
       8,675    Banque Nationale de Paris**                              461,302
      19,495    Barclays PLC**                                           519,902
       4,720    Credit Suisse Group**                                    731,356
      25,543    Deutsche Bank A.G.**                                   1,804,162
     237,015    Lloyds TSB Group PLC**                                 3,088,911
      17,348    National Westminster Bank PLC**                          290,582
      49,202    Skandinaviska Enskilda Banken - Class A**                623,213
       1,285    Societe Generale**                                       175,154
         940    UBS**                                                  1,361,132
       3,727    Unidanmark A/S - Class A                                 273,788
- --------------------------------------------------------------------------------
                                                                       9,329,502
- --------------------------------------------------------------------------------
Mortgage Banks - 0.6%
      17,622    Deutsche Pfandbrief & Hypothekenbank A.G.**            1,044,750
- --------------------------------------------------------------------------------
Multi-Line Insurance - 5.5%
       4,039    AGF (Assurances Generales de France)**                   214,107
       1,557    Allianz A.G.**                                           403,529
       7,462    AMB Aachener & Muenchener Beteiligungs-AG**              809,263
      66,430    Assicurazioni Generali                                 1,635,617
         290    Baloise Holdings, Ltd.**                                 537,431
      39,258    Pohjola Insurance Group - Class B                      1,456,274
      91,052    Royal & Sun Alliance Insurance Group PLC**               918,378
      40,688    Sampo Insurance Co., Ltd. - Class A                    1,344,938
      10,495    Skandia Forsakrings A.B.**                               495,361
       2,129    Zurich Versicherungs-Gesellschaft**                    1,015,929
- --------------------------------------------------------------------------------
                                                                       8,830,827
- --------------------------------------------------------------------------------
Office Furnishings - 0.6%
      29,714    Koninklijke Ahrend Groep N.V.**                          933,680
- --------------------------------------------------------------------------------
Oil - Field Services - 0.5%
      12,650    Petroleum Geo-Services (ADR)*                            819,088
- --------------------------------------------------------------------------------
Oil and Gas Drilling - 1.8%
      23,307    Elf Aquitaine S.A.**                                   2,711,980
       4,900    Transocean Offshore, Inc.                                236,119
- --------------------------------------------------------------------------------
                                                                       2,948,099
- --------------------------------------------------------------------------------
Oil Companies - Exploration and Production - 0.3%
      13,400    YPF S.A. (ADR)                                           458,112
- --------------------------------------------------------------------------------
Oil Companies - Integrated - 2.3%
      34,750    British Petroleum Co. PLC**                              460,566
       2,975    Lukoil Holding (ADR)                                     272,212
      26,716    Total S.A.**                                           2,908,807
- --------------------------------------------------------------------------------
                                                                       3,641,585
- --------------------------------------------------------------------------------
Oil Field Machinery and Equipment - 1.6%
      32,450    Schlumberger, Ltd.                                     2,612,225
- --------------------------------------------------------------------------------
Paper and Related Products - 0.2%
      56,100    Kimberly-Clark de Mexico, S.A. de C.V. - Class A    $    270,695
- --------------------------------------------------------------------------------
Public Thoroughfares - 1.1%
      49,590    Brisa-Auto Estradas de Portugal, S.A.*                 1,778,389
- --------------------------------------------------------------------------------
Publishing - Books - 3.5%
     111,104    Elsevier N.V.**                                        1,797,634
      29,866    Wolters Kluwer N.V.**                                  3,858,426
- --------------------------------------------------------------------------------
                                                                       5,656,060
- --------------------------------------------------------------------------------
Publishing - Newspapers - 1.0%
     363,576    Newsquest PLC*,**,+                                    1,585,304
- --------------------------------------------------------------------------------
Real Estate Investment and Management - 0.5%
      56,000    Mitsubishi Estate Co., Ltd.**                            611,593
      14,000    Mitsui Fudosan Co., Ltd.**                               135,670
- --------------------------------------------------------------------------------
                                                                         747,263
- --------------------------------------------------------------------------------
Recycling - 0.2%
      16,446    Tomra Systems A.S.A.                                     368,085
- --------------------------------------------------------------------------------
Reinsurance - 0.2%
         851    Muenchener Rueckversicherungs
                  -Gesellschaft A.G.**                                   320,892
- --------------------------------------------------------------------------------
Retail - Discount - 0.1%
      44,311    Cifra S.A. de C.V.                                       109,379
- --------------------------------------------------------------------------------
Retail - Diversified - 0%
       1,000    Ryohin Keikaku Co., Ltd.**                                66,143
- --------------------------------------------------------------------------------
Retail - Pubs - 0%
      14,635    J.D. Wetherspoon PLC**                                    79,465
- --------------------------------------------------------------------------------
Retail - Restaurants - 0.6%
      11,795    Tele Pizza S.A.*                                         951,862
- --------------------------------------------------------------------------------
Rubber - Tires - 0.9%
      20,936    Bridgestone Corp.**                                      455,687
      18,865    Compagnie Generale des Etablissements
                  Michelin - Class B**                                   950,170
- --------------------------------------------------------------------------------
                                                                       1,405,857
- --------------------------------------------------------------------------------
Security Services - 2.7%
         159    Prosegur, CIA de Seguridad S.A.                            1,596
     141,853    Securitas A.B. - Class B**                             4,290,795
- --------------------------------------------------------------------------------
                                                                       4,292,391
- --------------------------------------------------------------------------------
Special Purpose Banks - 0.5%
       1,174    Dexia Belgium (Credit Communal)+                         157,643
       5,368    Dexia France**                                           621,938
- --------------------------------------------------------------------------------
                                                                         779,581
- --------------------------------------------------------------------------------
Telecommunication Equipment - 2.0%
       2,336    Alcatel Alsthom**                                        297,055
      16,560    Nokia Oy - Class A                                     1,158,641
      12,025    Northern Telecom, Ltd.                                 1,070,225
       9,450    Oy Nokia Corp. (ADR) - Class A                           661,500
- --------------------------------------------------------------------------------
                                                                       3,187,421
- --------------------------------------------------------------------------------
Telecommunication Services - 1.5%
     106,000    China Telecom, Ltd.*,+                                   181,950
     105,740    Energis PLC*,**                                          443,661
     365,475    Freepages Group PLC*,**                                  192,433
      15,700    Nortel Inversora S.A. (ADR)                              400,350
      23,826    Telefonaktiebolaget L.M. Ericsson - Class B**            896,362
       9,027    Telefonaktiebolaget L.M. Ericsson (ADR)
                  - Class B**                                            336,820
- --------------------------------------------------------------------------------
                                                                       2,451,576
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

          JANUS ASPEN INTERNATIONAL GROWTH PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Telephone - Integrated - 3.1%
         424    Nippon Telegraph & Telephone Corp.**                $  3,652,331
       8,800    Telecom Argentina Stet S.A. (ADR)                        314,600
      84,554    Telecom Italia S.p.A.                                    541,185
       5,075    Telefonica de Argentina S.A. (ADR)                       189,044
      14,050    Telefonica del Peru S.A. (ADR)                           327,541
- --------------------------------------------------------------------------------
                                                                       5,024,701
- --------------------------------------------------------------------------------
Transportation - Services - 0.3%
      37,366    Stagecoach Holdings PLC**                                513,375
- --------------------------------------------------------------------------------
Travel Services - 0.2%
          98    Kuoni Reisen A.G. - Class B**                            367,865
- --------------------------------------------------------------------------------
Total Common Stock (cost $134,776,396)                               146,847,850
- --------------------------------------------------------------------------------
Foreign Bonds - 0.2%
JPY
  65,000,000    STB Cayman Capital, Ltd., 0.50%
                  bank guaranteed notes, due 10/1/07**,+
                  (cost $563,820)                                        364,941
- --------------------------------------------------------------------------------
Preferred Stock - 0.4%
- --------------------------------------------------------------------------------
Brewery - 0%
      48,000    Companhia Cervejaria Brahma                               32,257
- --------------------------------------------------------------------------------
Electric - Integrated - 0.1%
   4,713,000    Companhia Energetica de Minas Gerais                     204,775
   1,000,000    Companhia Paranaense de Energia-Copel                     13,575
- --------------------------------------------------------------------------------
                                                                         218,350
- --------------------------------------------------------------------------------
Oil Companies - Integrated - 0.1%
     430,000    Petroleo Brasileiro S.A.                                 100,329
- --------------------------------------------------------------------------------
Telecommunication Equipment - 0.2%
  11,690,000    Ericsson Telecomunicacoes S.A.                           374,995
- --------------------------------------------------------------------------------
Total Preferred Stock (cost $953,392)                                    725,931
- --------------------------------------------------------------------------------
U.S. Government Agency - 10.2%
                Freddie Mac
 $16,400,000      6.00%, 1/2/98 (amortized cost $16,397,267)          16,397,267
- --------------------------------------------------------------------------------
Total Investments (total cost $152,690,875) - 102.0%                 164,335,989
- --------------------------------------------------------------------------------
Liabilities, net of Cash, Receivables and Other Assets -  (2.0%)     (3,234,480)
- --------------------------------------------------------------------------------
Net Assets - 100%                                                   $161,101,509
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

          JANUS ASPEN INTERNATIONAL GROWTH PORTFOLIO December 31, 1997

                       Summary of Investments by Country
                               December 31, 1997

Country                       % of Investment Securities    Market Value
- --------------------------------------------------------------------------------
Argentina                                  0.9%             $  1,447,156
Austria                                    0.6%                  935,280
Belgium                                    0.1%                  159,295
Brazil                                     1.5%                2,470,077
Canada                                     0.7%                1,070,225
Chile                                      0.1%                  224,250
Denmark                                    1.4%                2,215,979
Finland                                    4.1%                6,724,483
France                                    11.9%               19,521,791
Germany                                    5.9%                9,767,802
Hong Kong                                  0.7%                1,095,316
India                                      0.0%                   21,250
Ireland                                    0.0%                   60,145
Italy                                      3.0%                4,861,938
Japan                                      8.4%               13,815,750
Luxembourg                                 0.0%                   49,477
Mexico                                     1.0%                1,720,636
Netherlands                               11.3%               18,546,743
Norway                                     1.1%                1,733,979
Peru                                       0.2%                  327,541
Portugal                                   1.1%                1,778,389
Romania                                    0.1%                  155,986
Russia                                     0.3%                  566,576
South Africa                               0.0%                      405
Spain                                      0.6%                  953,458
Sweden                                     8.4%               13,858,698
Switzerland                                5.6%                9,267,270
United Kingdom                            19.3%               31,740,484
United States ++                          11.7%               19,245,610
- --------------------------------------------------------------------------------
Total                                    100.0%             $164,335,989
================================================================================
++ Includes Short-Term Securities (1.7% excluding Short-Term Securities)

                           Forward Currency Contracts
                           Open at December 31, 1997

Currency Sold and               Currency            Currency        Unrealized
Settlement Date               Units Sold      Value in $ U.S.       Gain/(Loss)
- --------------------------------------------------------------------------------
British Pound 2/11/98            500,000         $   822,800         ($ 16,865)
British Pound 2/18/98          2,900,000           4,770,500           (66,106)
British Pound 2/19/98            900,000           1,480,500            21,600
Dutch Guilder 1/9/98             500,000             246,914             3,776
Dutch Guilder 2/18/98            375,000             185,671            (6,194)
Dutch Guilder 2/19/98          2,600,000           1,287,384            30,178
French Franc 2/18/98           5,543,000             922,956           (26,421)
French Franc 3/18/98           5,000,000             833,847            25,850
German Deutschemark 1/9/98     1,000,000             556,421             7,913
German Deutschemark 1/15/98       60,000              33,400               917
German Deutschemark 2/3/98        29,000              16,163               212
German Deutschemark 2/18/98      200,000             111,564            (3,636)
German Deutschemark 2/26/98      446,000             248,898            (1,532)
Japanese Yen 1/20/98           3,500,000              26,852             4,680
Japanese Yen 2/18/98         235,000,000           1,802,971           194,546
Japanese Yen 2/19/98           4,000,000              30,689             4,094
Japanese Yen 3/18/98         198,200,000           1,520,696           194,802
Japanese Yen 3/25/98          19,500,000             149,616             3,746
Japanese Yen 4/22/98         397,000,000           3,046,153            68,624
Swedish Krona 1/15/98            585,000              73,787             2,270
Swedish Krona 2/11/98            464,000              58,573               536
Swiss Franc 1/9/98               600,000             410,931             3,692
Swiss Franc 1/20/98               50,000              34,293               622
Swiss Franc 2/2/98                35,000              24,047               200
Swiss Franc 2/18/98              150,000             103,242            (1,354)
Swiss Franc 2/19/98              400,000             275,349               133
Swiss Franc 2/26/98               36,000              24,800             1,062
- --------------------------------------------------------------------------------
Total                                            $19,099,017          $447,345
================================================================================

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

  JANUS ASPEN WORLDWIDE GROWTH PORTFOLIO Portfolio Manager, Helen Young Hayes

1997 in Review

Overall,  I am pleased  with the  performance  of the  Portfolio,  which held up
relatively  well  during  the  global  market  turmoil  in the  fourth  quarter.
Certainly,  being  underweighted  in the Far East and Japan and  overweighted in
Europe helped us to outperform the benchmark.

Our reasons for this allocation were simple:  Prices in the emerging  markets of
Asia had  become  excessive,  given  the  structural  problems  in many of those
countries.  In Japan,  the government was not taking the necessary steps to stem
problems  within its  financial  industry  and deal with a lingering  recession,
while Japanese  businesses  have yet to implement the changes needed to increase
productivity and retain a competitive edge in a global marketplace.

Markets in Europe,  on the other  hand,  were quite  strong.  Governments  there
appear  serious  about  reining in  inflation  and  facing  the tough  decisions
required for  sustainable  economic  growth.  At the same time,  businesses  are
embracing the kind of restructuring  that has helped American  companies and the
U.S.  stock  market in  recent  years.  Bank and  financial  services  stocks in
particular benefited from the move to strengthen the economy,  progress toward a
single European currency (the Euro), and a trend toward consolidation.

In November and December, however, the currency crisis in Southeast Asia spilled
over to  markets  worldwide,  including  Europe,  Latin  America  and the United
States.  The year ended with nearly  universal  volatility,  especially  for the
stocks of companies  with  exposure to Southeast  Asia.  Technology  stocks were
among the hardest hit, largely in response to concerns about a potential falloff
in demand in parts of the Far East.

- --------------------------------------------------------------------------------
Portfolio Profile                 December 31, 1997      December 31, 1996
Equities                                 97.4%                  88.1%
  Foreign                                77.8%                  78.3%
Number of Stocks                          205                    209
Top 10 Equities                          21.0%                  19.8%
Cash & Cash Equivalents                   2.6%                  11.9%
- --------------------------------------------------------------------------------

Portfolio Review

Among the sectors that performed well for the Portfolio were pharmaceuticals and
financial services.  For example,  Akzo Nobel, a  Netherlands-based  company, is
exiting the low-return, cyclical chemical business and repositioning itself as a
life  sciences  company.  Its drug sales are gaining  momentum  with new product
launches, including the release of Remeron, a new antidepressant.

Our research  also revealed  several good  opportunities  in Europe's  financial
industry,  where significant  merger and acquisition  activity is helping to cut
costs and increase  profitability.  We acquired shares of Zurich-based UBS prior
to the  announcement of a merger with Swiss Bank Corp. and added shares of Swiss
Life, an attractively  valued  franchise in the Swiss life insurance market that
may be a likely takeover candidate.

Although  they were  among our best  contributors  to total  return  before  the
monetary crisis in Asia, our technology stocks were ultimately laggards.  Nearly
all were  tarred by the same brush:  fears of a global  economic  slowdown  that
might depress demand for  telecommunications,  computer and consumer electronics
equipment.

Philips  Electronics,  a  Dutch  manufacturer  of  semiconductors  and  consumer
electronics   with   substantial   business  in  Southeast  Asia,  was  a  major
disappointment.  We pared  back our  position  but did not  eliminate  the stock
because most of the fundamental  reasons to own it remain intact.  Management is
squarely focused on enhancing shareholder value and is determined to continue to
divest unrelated and underperforming divisions in 1998.

Elsewhere,  however,  we viewed the compression of technology stock prices as an
opportunity to add some high-quality names to the portfolio mix, including Cisco
Systems,  Microsoft and Texas Instruments (U.S.) and Sony (Japan).  In our view,
the fears relating to technology are overblown; demand continues to grow in both
the developed and developing regions of the world.

Looking Ahead

As we entered  1998,  it was evident that the  difficulties  in  Southeast  Asia
continued to upset markets around the world.  In our view,  though,  this is not
necessarily a negative.  It should  provide us ample  opportunity to fortify the
Portfolio   with   high-quality   growth   stocks,   including   technology  and
pharmaceutical issues, at more reasonable valuations than we saw last year.

Europe is on the right track and should prove a good source of restructuring and
consolidation  plays. We remain cautious in our outlook on Southeast Asia, Korea
and Japan but are more  positive  about the  prospects  for Latin  America.  The
Brazilian real (currency) is under pressure.  The market there is quite volatile
and is likely to remain so until the government takes stronger  measures to curb
inflation.  Mexico,  in  contrast,  is  recovering  nicely from the low of 1994.
Selectivity  will be the key to  success  in this  region  as well as the  other
emerging markets. It will be more important than ever that we apply our in-depth
research to choose the best individual ideas.

Thank  you for  your  continued  investment  in  Janus  Aspen  Worldwide  Growth
Portfolio.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

  JANUS ASPEN WORLDWIDE GROWTH PORTFOLIO Portfolio Manager, Helen Young Hayes

- --------------------------------------------------------------------------------
Average Annual Total Return(1)
For the Periods Ended December 31, 1997
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 9/13/93)
  1 Year                                                22.15%
  From Inception                                        22.96%
- --------------------------------------------------------------------------------
Morgan Stanley Capital International World Index(2)
  1 Year                                                15.76%
  From Inception Date
    of Institutional Shares                             12.79%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                   --
  From Inception                                        14.22%
- --------------------------------------------------------------------------------
Note: Performance of the Retirement  Shares is lower from the performance  shown
      on this graph for the  Institutional  Shares,  based upon the higher  fees
      paid by shareholders investing in this class.
- --------------------------------------------------------------------------------

Performance Overview(1)          Source - Lipper Analytical Services, Inc. 1997.

GRAPHIC

A graphic comparison of the change in value of a hypothetical $10,000 investment
in Janus Aspen Worldwide Growth Portfolio - Institutional  Shares and the Morgan
Stanley  Capital   International  World  Index.  Janus  Aspen  Worldwide  Growth
Portfolio -  Institutional  Shares is  represented  by a solid  black line.  The
Morgan  Stanley  Capital  International  World Index is  represented by a dashed
black line.  The "y" axis  reflects  the value of the  investment.  The "x" axis
reflects the  computation  periods from inception,  September 13, 1993,  through
December 31,  1997.  The upper right  quadrant  reflects the ending value of the
hypothetical   investment  in  Janus  Aspen  International  Growth  Portfolio  -
Institutional  Shares  ($24,278)  as  compared  to the  Morgan  Stanley  Capital
International World Index ($16,763).

(1)  All returns reflect reinvested  dividends.  The Portfolio's  securities may
     differ significantly from the securities in the Index. Index returns do not
     include  taxes or  dividends  and interest  payments or operating  expenses
     necessary to maintain a portfolio  consisting of the same  securities  that
     are in the Index.  These returns do not reflect the charges and expenses of
     any particular  insurance product or qualified plan.  Investment return and
     principal value will fluctuate so that shares, when redeemed,  may be worth
     more or less than their  original cost.  The advisor  voluntarily  waives a
     portion of the Portfolio's  expenses.  Without such waiver, the Portfolio's
     total returns for each class would have been lower.  Past  performance does
     not guarantee future results.
(2)  Net dividends  reinvested  are the  dividends  that remain to be reinvested
     after foreign tax  obligations  have been met. Such  obligations  vary from
     country to country.

            JANUS ASPEN WORLDWIDE GROWTH PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Common Stock - 96.7%
- --------------------------------------------------------------------------------
Airlines - 1.6%
     548,292    Deutsche Lufthansa A.G.**,+                         $ 10,520,368
     170,902    KLM Royal Dutch Air Lines N.V.**                       6,322,750
      78,775    Ryanair Holdings PLC (ADR)*                            1,979,222
       2,088    Sairgroup*,**                                          2,863,116
     179,833    SAS Danmark A/S                                        2,626,369
      47,033    SAS Norske ASA - Class B                                 657,118
- --------------------------------------------------------------------------------
                                                                      24,968,943
- --------------------------------------------------------------------------------
Airport Development - Maintenance - 0.5%
     730,809    Aeroporti di Roma S.p.A.*,+                            7,559,425
- --------------------------------------------------------------------------------
Appliances - 1.6%
     353,938    Electrolux A.B. - Class B**                           24,579,145
- --------------------------------------------------------------------------------
Athletic Footwear - 0.4%
      44,794    Adidas A.G.**                                          5,894,331
- --------------------------------------------------------------------------------
Audio and Video Products - 1.8%
     324,700    Sony Corp.**                                          28,968,531
- --------------------------------------------------------------------------------
Automotive - Cars and Light Trucks - 0.9%
     490,241    Renault S.A.*,**                                      13,796,494
      40,219    Tata Engineering & Locomotive Co., Ltd. (GDR)+           319,741
- --------------------------------------------------------------------------------
                                                                      14,116,235
- --------------------------------------------------------------------------------
Automotive - Truck Parts and Equipment - 0.2%
     154,000    Denso Corp.**                                          2,783,395
- --------------------------------------------------------------------------------
Brewery - 0.4%
     791,700    Fomento Economico Mexicano, S.A. de C.V.               6,363,605
- --------------------------------------------------------------------------------
Broadcast Services and Programming - 0.6%
     227,175    Grupo Televisa S.A. (GDR)*                             8,788,833
      31,175    Modern Times Group MTG A.B.*,**                          186,633
- --------------------------------------------------------------------------------
                                                                       8,975,466
- --------------------------------------------------------------------------------
Building - Heavy Construction - 0.2%
      34,715    Compagnie Fransaise d'Etudes et
                  de Construction Technip**                         $  3,664,317
- --------------------------------------------------------------------------------
Building and Construction - 0.7%
     104,203    Suez Lyonnaise des Eaux**                             11,536,036
- --------------------------------------------------------------------------------
Building and Construction Products - 0.1%
     121,000    Matsushita Electric Works, Ltd.**                      1,051,599
- --------------------------------------------------------------------------------
Cable Television - 2.1%
     281,525    Comcast Corp. - Special Class A                        8,885,633
     877,875    Tele-Communications, Inc. - Class A*                  24,525,633
- --------------------------------------------------------------------------------
                                                                      33,411,266
- --------------------------------------------------------------------------------
Cellular Telecommunications - 0.1%
      60,850    Millicom International Cellular S.A.*                  2,289,481
- --------------------------------------------------------------------------------
Chemicals - Diversified - 5.1%
     183,753    Akzo Nobel N.V.**,+                                   31,688,631
     160,875    E.I. du Pont de Nemours and Co.                        9,662,555
     310,619    Imperial Chemical Industries PLC**                     4,860,490
     557,175    Monsanto Co.                                          23,401,350
     411,740    Solutia, Inc.                                         10,988,311
- --------------------------------------------------------------------------------
                                                                      80,601,337
- --------------------------------------------------------------------------------
Chemicals - Specialty - 0.1%
       1,388    Clariant A.G.**                                        1,160,988
     146,934    Victrex PLC**                                            568,148
- --------------------------------------------------------------------------------
                                                                       1,729,136
- --------------------------------------------------------------------------------
Circuits - 0%
      21,025    Analog Devices, Inc.*                                    582,130
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

            JANUS ASPEN WORLDWIDE GROWTH PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Commercial Banks - 3.3%
   2,795,305    Banca Commerciale Italiana                          $  9,728,251
      12,850    Banco Rio de La Plata S.A. (ADR)*                        179,900
      26,234    Bankgesellschaft Berlin A.G.**                           577,776
     193,394    Bayerische Vereinsbank A.G.**                         12,659,582
     139,896    BG Bank A/S+                                           9,418,735
      68,592    Credit Commercial de France**                          4,703,266
     194,304    Erste Bank Der Oesterreichischen
                  Sparkassen A.G.*,**,+                                9,668,475
     460,598    Merita PLC - Class A                                   2,520,588
      61,300    Uniao de Bancos Brasileiros S.A. (GDR)*                1,973,094
- --------------------------------------------------------------------------------
                                                                      51,429,667
- --------------------------------------------------------------------------------
Commercial Services - 0.8%
     623,335    BTG PLC**                                              6,923,039
     167,450    Quintiles Transnational Corp.*                         6,404,963
- --------------------------------------------------------------------------------
                                                                      13,328,002
- --------------------------------------------------------------------------------
Computer Services - 4.5%
      71,821    Atos S.A.*,**                                          9,264,306
     157,779    Cap Gemini S.A.**                                     12,943,105
   1,703,956    Capita Group PLC**                                    10,401,687
     121,314    Delphi Group PLC**                                     1,351,360
     251,259    Getronics N.V.**                                       8,006,667
     746,890    Logica PLC**                                          14,292,489
     322,926    Misys PLC**                                            9,776,701
     270,600    WM-Data A.B. - Class B**                               4,894,042
- --------------------------------------------------------------------------------
                                                                      70,930,357
- --------------------------------------------------------------------------------
Computer Software - 6.2%
      34,750    Dassault Systemes S.A. (ADR)                           1,072,906
     331,321    JBA Holdings PLC**                                     5,642,360
     246,972    Merkantildata A.S.A.                                   8,509,126
     267,200    Microsoft Corp.*                                      34,535,600
         407    NTT Data Corp.**                                      22,005,738
     394,800    Parametric Technology Co.*                            18,703,650
      45,305    SEMA Group PLC**                                       1,103,264
      48,895    TT Tieto Oy - Class B                                  5,504,127
- --------------------------------------------------------------------------------
                                                                      97,076,771
- --------------------------------------------------------------------------------
Computers - Integrated Systems - 0.2%
       1,222    Dimension Data Holdings, Ltd.*,+                           5,273
     238,000    Fujitsu, Ltd.**                                        2,562,661
- --------------------------------------------------------------------------------
                                                                       2,567,934
- --------------------------------------------------------------------------------
Computers - Micro - 0.3%
      94,725    Compaq Computer Corp.*                                 5,346,042
- --------------------------------------------------------------------------------
Cosmetics and Toiletries - 0.5%
     180,444    Rhone-Poulenc - Class A**                              8,086,572
- --------------------------------------------------------------------------------
Diversified Operations - 9.5%
     159,723    Amer Group, Ltd.*                                      3,065,118
         490    Barco N.V.                                                89,933
     525,925    CBS Corp.                                             15,481,917
     233,000    Citic Pacific, Ltd.                                      926,194
   6,257,820    First Pacific Co., Ltd.                                3,028,655
      22,300    General Electric Co. PLC                               1,636,262
     181,107    Grupo Carso S.A. de C.V. - Series A1                   1,210,853
   1,300,578    Hays PLC**                                            17,345,107
     395,000    Hutchison Whampoa, Ltd.                                2,477,586
      45,177    Kinnevik A.B. - Class B**                                748,740
     297,908    Lagardere S.C.A.**                                     9,854,563
     119,450    Metra Oy - Class B                                     2,807,758
      34,300    Minnesota Mining and Manufacturing Co.                 2,814,744
   7,925,774    Rentokil Initial PLC**                                35,136,551
   1,760,736    Siebe PLC**                                           34,620,524
- --------------------------------------------------------------------------------
Diversified Operations - (continued)
     427,500    Swire Pacific, Ltd. - Class A                       $  2,344,879
     396,212    TI Group PLC**                                         3,044,500
   1,057,858    Tomkins PLC**                                          5,012,927
   1,184,782    Williams PLC**                                         6,589,108
- --------------------------------------------------------------------------------
                                                                     148,235,919
- --------------------------------------------------------------------------------
Drug Delivery Systems - 0.2%
      63,225    Elan Corp. PLC (ADR)*                                  3,236,330
- --------------------------------------------------------------------------------
Electric - Distribution - 0.1%
      48,263    Unified Energy System (GDR)*                           1,435,824
- --------------------------------------------------------------------------------
Electric - Integrated - 0.2%
      58,325    Cemig S.A. (ADR)                                       2,566,300
      14,775    Mosenergo (ADR)+                                         554,062
- --------------------------------------------------------------------------------
                                                                       3,120,362
- --------------------------------------------------------------------------------
Electric Products - 0.4%
     471,000    Hitachi, Ltd.**                                        3,368,915
      36,772    Siemens A.G.**                                         2,178,045
- --------------------------------------------------------------------------------
                                                                       5,546,960
- --------------------------------------------------------------------------------
Electronic Components - 3.7%
     486,613    Electrocomponents PLC**                                3,627,049
     413,821    Philips Electronics N.V.**                            24,822,397
     475,011    Philips Electronics N.V. - N.Y. Shares**              28,738,165
      82,826    Pricer A.B. - Class B*,**                              1,534,518
- --------------------------------------------------------------------------------
                                                                      58,722,129
- --------------------------------------------------------------------------------
Electronic Components - Semiconductors - 1.6%
      28,200    Intel Corp.                                            1,981,050
     501,550    Texas Instruments, Inc.                               22,569,750
- --------------------------------------------------------------------------------
                                                                      24,550,800
- --------------------------------------------------------------------------------
Electronic Parts Distributors - 0.2%
     518,585    Premier Farnell PLC**                                  3,737,365
- --------------------------------------------------------------------------------
Film Processing - 0.7%
     257,252    GrandVision**,+                                       10,587,942
- --------------------------------------------------------------------------------
Finance - Consumer Loans - 0.2%
      26,975    SLM Holding Corp.                                      3,752,897
- --------------------------------------------------------------------------------
Food - Catering - 0.6%
     811,853    Compass Group PLC**,+                                 10,005,314
- --------------------------------------------------------------------------------
Food - Dairy Products - 0.3%
     158,505    Koninklijke Nutricia Verenidge Bedrijven N.V.**        4,808,567
- --------------------------------------------------------------------------------
Food - Diversified - 0.9%
      28,578    Danone**                                               5,106,724
      78,094    Raisio Group PLC*                                      9,249,982
- --------------------------------------------------------------------------------
                                                                      14,356,706
- --------------------------------------------------------------------------------
Food - Retail - 0.1%
      25,175    Disco S.A. (ADR)*                                      1,120,287
- --------------------------------------------------------------------------------
Home Furnishings - 0.1%
     198,983    Ekornes A.S.A.                                         1,632,958
- --------------------------------------------------------------------------------
Human Resources - 0.1%
      29,575    Manpower, Inc.                                         1,042,519
      70,555    Vedior N.V.**,+                                        1,270,335
- --------------------------------------------------------------------------------
                                                                       2,312,854
- --------------------------------------------------------------------------------
Investment Companies - 0.4%
     118,560    Investor A.B. - B Shares**                             5,782,786
- --------------------------------------------------------------------------------
Investment Management and Advisory Services - 0.1%
     149,931    Amvescap PLC**                                         1,284,721
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

            JANUS ASPEN WORLDWIDE GROWTH PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Life and Health Insurance - 1.2%
      23,254    Schweizerishe Lebensversicherungs-und
                  Rentenanstalt**                                   $ 18,286,874
       2,131    Union des Assurances Federales**                         279,842
- --------------------------------------------------------------------------------
                                                                      18,566,716
- --------------------------------------------------------------------------------
Machinery - General Industrial - 0.5%
      32,375    ASM Lithography Holding N.V. (ADR)*                    2,185,313
     653,897    Powerscreen International PLC**                        6,573,387
- --------------------------------------------------------------------------------
                                                                       8,758,700
- --------------------------------------------------------------------------------
Machinery - Pumps - 0%
       4,500    Pfeiffer Vacuum Technology A.G. (ADR)*                   125,438
- --------------------------------------------------------------------------------
Medical - Biomedical and Genetic - 0.2%
       2,174    Ares-Serono Group - Class B**                          3,592,154
- --------------------------------------------------------------------------------
Medical - Drugs - 6.7%
     137,300    Bristol-Myers Squibb Co.                              12,992,013
      93,975    Eli Lilly and Co.                                      6,543,009
      11,297    Novartis A.G.**                                       18,356,499
     132,925    Pfizer, Inc.                                           9,911,220
       2,039    Roche Holding A.G.**                                  20,277,450
      20,025    Schering-Plough Corp.                                  1,244,053
     457,440    SmithKline Beecham PLC**                               4,723,015
      91,400    SmithKline Beecham PLC (ADR)**                         4,701,388
     356,000    Takeda Chemical Industries**                          10,185,425
     125,000    Warner-Lambert Co.                                    15,500,000
- --------------------------------------------------------------------------------
                                                                     104,434,072
- --------------------------------------------------------------------------------
Medical - Wholesale Drug Distributors - 0.4%
      30,400    Cardinal Health, Inc.                                  2,283,800
      20,200    Gehe A.G.**                                            1,011,099
     175,325    Grupo Casa Autrey S.A. de C.V. (ADR)                   3,583,205
- --------------------------------------------------------------------------------
                                                                       6,878,104
- --------------------------------------------------------------------------------
Medical Products - 0.4%
      31,350    Fresenius Medical Care A.G. (ADR)*                       681,863
     163,862    Ortivus A.B. - B Shares*,**                            5,472,832
- --------------------------------------------------------------------------------
                                                                       6,154,695
- --------------------------------------------------------------------------------
Metal Processors and Fabricators - 1.0%
     617,490    Assa Abloy A.B. - Class B**                           16,343,204
- --------------------------------------------------------------------------------
Money Center Banks - 6.0%
      31,500    BankAmerica Corp.                                      2,299,500
      86,157    Banque Nationale de Paris**                            4,581,492
     266,091    Barclays PLC**                                         7,096,243
      48,093    Credit Suisse Group*,**                                7,451,929
     253,755    Deutsche Bank A.G.**                                  17,923,312
   2,079,413    Lloyds TSB Group PLC**                                27,100,065
     172,305    National Westminster Bank PLC**                        2,886,138
     501,863    Skandinaviska Enskilda Banken - Class A**              6,356,810
      12,919    Societe Generale**                                     1,760,941
       9,830    UBS**                                                 14,233,962
      38,197    Unidanmark A/S - Class A                               2,805,974
- --------------------------------------------------------------------------------
                                                                      94,496,366
- --------------------------------------------------------------------------------
Mortgage Banks - 0.8%
     212,930    Deutsche Pfandbrief & Hypothekenbank A.G.**           12,623,913
- --------------------------------------------------------------------------------
Multi-Line Insurance - 3.4%
      42,856    AGF (Assurances Generales de France)**                 2,271,790
      15,921    Allianz A.G.**                                         4,126,256
     284,822    Assicurazioni Generali                                 7,012,790
       3,550    Baloise Holdings, Ltd.**                               6,578,892
      39,823    Pohjola Insurance Group - Class B                      1,477,232
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
Multi-Line Insurance - (continued)
     958,046    Royal & Sun Alliance Insurance Group PLC**          $  9,663,141
     164,356    Sampo Insurance Co., Ltd. - Class A                    5,432,774
     110,265    Skandia Forsakrings A.B.**                             5,204,482
      24,413    Zurich Versicherungs-Gesellschaft**                   11,649,540
- --------------------------------------------------------------------------------
                                                                      53,416,897
- --------------------------------------------------------------------------------
Networking Products - 2.9%
     822,738    Cisco Systems, Inc.*                                  45,867,616
- --------------------------------------------------------------------------------
Office Furnishings - 0.6%
     314,396    Koninklijke Ahrend Groep N.V.**                        9,879,024
- --------------------------------------------------------------------------------
Oil - Field Services - 0.6%
      29,375    Halliburton Co.                                        1,525,664
     125,675    Petroleum Geo-Services (ADR)*                          8,137,456
- --------------------------------------------------------------------------------
                                                                       9,663,120
- --------------------------------------------------------------------------------
Oil and Gas Drilling - 2.0%
     242,179    Elf Aquitaine S.A.**                                  28,179,719
      55,050    Transocean Offshore, Inc.                              2,652,722
- --------------------------------------------------------------------------------
                                                                      30,832,441
- --------------------------------------------------------------------------------
Oil Companies - Exploration and Production - 0.3%
     160,250    YPF S.A. (ADR)                                         5,478,547
- --------------------------------------------------------------------------------
Oil Companies - Integrated - 0.8%
     366,381    British Petroleum Co. PLC**                            4,855,903
      27,550    Lukoil Holding (ADR)                                   2,520,825
      54,434    Total S.A.**                                           5,926,710
- --------------------------------------------------------------------------------
                                                                      13,303,438
- --------------------------------------------------------------------------------
Oil Field Machinery and Equipment - 0.8%
     151,600    Schlumberger, Ltd.                                    12,203,800
- --------------------------------------------------------------------------------
Paper and Related Products - 0.2%
     608,400    Kimberly-Clark de Mexico, S.A. de C.V. - Class A       2,935,664
- --------------------------------------------------------------------------------
Publishing - Books - 2.4%
     831,067    Elsevier N.V.**                                       13,446,446
     186,145    Wolters Kluwer N.V.**                                 24,048,306
- --------------------------------------------------------------------------------
                                                                      37,494,752
- --------------------------------------------------------------------------------
Publishing - Newspapers - 1.1%
   3,812,719    Newsquest PLC*,**,+                                   16,624,637
- --------------------------------------------------------------------------------
Real Estate Investment and Management - 0.6%
     705,000    Mitsubishi Estate Co., Ltd.**                          7,699,520
     204,000    Mitsui Fudosan Co., Ltd.**                             1,976,910
- --------------------------------------------------------------------------------
                                                                       9,676,430
- --------------------------------------------------------------------------------
Recycling - 0.3%
     207,147    Tomra Systems A.S.A.                                   4,636,242
- --------------------------------------------------------------------------------
Reinsurance - 0.2%
       8,698    Muenchener Rueckversicherungs
                  -Gesellschaft A.G.**                                 3,279,812
- --------------------------------------------------------------------------------
Retail - Discount - 0.1%
     476,187    Cifra S.A. de C.V.                                     1,175,434
- --------------------------------------------------------------------------------
Retail - Diversified - 0.1%
      30,800    Ryohin Keikaku Co., Ltd.**                             2,037,208
- --------------------------------------------------------------------------------
Retail - Pubs - 0.2%
     509,505    J.D. Wetherspoon PLC**                                 2,766,520
- --------------------------------------------------------------------------------
Retail - Restaurants - 1.0%
     187,936    Tele Pizza S.A.*                                      15,166,530
- --------------------------------------------------------------------------------
Rubber - Tires - 1.0%
     211,328    Bridgestone Corp.**                                    4,599,702
     223,723    Compagnie Generale des Etablissements
                  Michelin - Class B**                                11,268,222
- --------------------------------------------------------------------------------
                                                                      15,867,924
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

            JANUS ASPEN WORLDWIDE GROWTH PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Security Services - 0.5%
       8,269    Prosegur, CIA de Seguridad S.A.                     $     83,007
     265,060    Securitas A.B. - Class B**                             8,017,582
- --------------------------------------------------------------------------------
                                                                       8,100,589
- --------------------------------------------------------------------------------
Special Purpose Banks - 0.7%
      29,337    Dexia Belgium (Credit Communal)+                       3,939,325
      63,099    Dexia France**                                         7,310,674
- --------------------------------------------------------------------------------
                                                                      11,249,999
- --------------------------------------------------------------------------------
Super-Regional Banks - 0.2%
      11,575    Wells Fargo & Co.                                      3,928,989
- --------------------------------------------------------------------------------
Telecommunication Equipment - 1.6%
      35,413    Alcatel Alsthom**                                      4,503,252
     120,710    Nokia Oy - Class A                                     8,445,624
      78,525    Northern Telecom, Ltd.                                 6,988,725
      79,250    Oy Nokia Corp. (ADR) - Class A                         5,547,500
- --------------------------------------------------------------------------------
                                                                      25,485,101
- --------------------------------------------------------------------------------
Telecommunication Services - 2.0%
   1,118,000    China Telecom, Ltd.*,+                                 1,919,061
   1,077,829    Energis PLC*,**                                        4,522,323
   6,923,325    Freepages Group PLC*,**                                3,645,324
     194,950    Nortel Inversora S.A. (ADR)                            4,971,225
     312,133    Telefonaktiebolaget L.M. Ericsson - Class B**         11,742,809
     144,886    Telefonaktiebolaget L.M. Ericsson (ADR)
                  - Class B**                                          5,406,059
- --------------------------------------------------------------------------------
                                                                      32,206,801
- --------------------------------------------------------------------------------
Telephone - Integrated - 3.5%
       4,156    Nippon Telegraph & Telephone Corp.**                  35,799,731
      82,800    Telecom Argentina Stet S.A. (ADR)                      2,960,100
   1,056,722    Telecom Italia S.p.A.                                  6,763,513
     107,750    Telefonica de Argentina S.A. (ADR)                     4,013,687
     233,150    Telefonica del Peru S.A. (ADR)                         5,435,309
- --------------------------------------------------------------------------------
                                                                      54,972,340
- --------------------------------------------------------------------------------
Transportation - Services - 0.5%
     586,656    Stagecoach Holdings PLC**                              8,060,120
- --------------------------------------------------------------------------------
Travel Services - 0.3%
       1,341    Kuoni Reisen A.G. - Class B**                          5,033,746
- --------------------------------------------------------------------------------
Total Common Stock (cost $1,324,618,947)                           1,525,387,527
- --------------------------------------------------------------------------------
Preferred Stock - 0.7%
- --------------------------------------------------------------------------------
Brewery - 0.1%
   1,508,000    Companhia Cervejaria Brahma                            1,013,423
- --------------------------------------------------------------------------------
Electric - Integrated - 0.2%
  76,520,000    Companhia Energetica de Minas Gerais                $  3,324,721
  23,000,000    Companhia Paranaense de Energia-Copel                    312,226
- --------------------------------------------------------------------------------
                                                                       3,636,947
- --------------------------------------------------------------------------------
Oil Companies - Integrated - 0.1%
   5,625,000    Petroleo Brasileiro S.A.                               1,315,266
- --------------------------------------------------------------------------------
Telecommunication Equipment - 0.3%
 130,600,000    Ericsson Telecomunicacoes S.A.                         4,189,423
- --------------------------------------------------------------------------------
Total Preferred Stock (cost $12,679,990)                              10,155,059
- --------------------------------------------------------------------------------
U.S. Government Agency - 0.1%
                Freddie Mac
 $ 2,100,000      6.00%, 1/2/98 (amortized cost $2,099,650)            2,099,650
- --------------------------------------------------------------------------------
Short-Term Corporate Notes - 1.6%
                Norwest Corp.
  25,000,000      5.82%, 1/7/98 (amortized cost $24,975,750)          24,975,750
- --------------------------------------------------------------------------------
Total Investments (total cost $1,364,374,337) - 99.1%              1,562,617,986
- --------------------------------------------------------------------------------
Cash, Receivables and Other Assets, net of Liabilities - 0.9%         14,333,200
- --------------------------------------------------------------------------------
Net Assets - 100%                                                 $1,576,951,186
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

            JANUS ASPEN WORLDWIDE GROWTH PORTFOLIO December 31, 1997

                       Summary of Investments by Country
                               December 31, 1997

Country                       % of Investment Securities    Market Value
- --------------------------------------------------------------------------------
Argentina                                  1.2%             $ 18,723,746
Austria                                    0.6%                9,668,474
Belgium                                    0.2%                4,029,257
Brazil                                     0.9%               14,694,452
Canada                                     0.5%                6,988,725
Denmark                                    1.0%               14,851,077
Finland                                    2.8%               44,050,702
France                                    10.0%              156,698,873
Germany                                    4.6%               71,601,794
Hong Kong                                  0.7%               10,696,375
India                                      0.0%                  319,741
Ireland                                    0.3%                5,215,551
Italy                                      2.0%               31,063,977
Japan                                      7.9%              123,039,334
Luxembourg                                 0.2%                2,289,481
Mexico                                     1.5%               24,057,593
Netherlands                                9.9%              155,216,602
Norway                                     1.5%               23,572,900
Peru                                       0.4%                5,435,309
Russia                                     0.3%                4,510,711
South Africa                               0.0%                    5,272
Spain                                      1.0%               15,249,537
Sweden                                     6.2%               96,269,643
Switzerland                                7.0%              109,485,149
United Kingdom                            17.8%              278,540,907
United States ++                          21.5%              336,342,804
- --------------------------------------------------------------------------------
Total                                    100.0%           $1,562,617,986
================================================================================
++ Includes Short-Term Securities (19.8% excluding Short-Term Securities)


                           Forward Currency Contracts
                           Open at December 31, 1997

Currency Sold and               Currency            Currency        Unrealized
Settlement Date               Units Sold      Value in $ U.S.       Gain/(Loss)
- --------------------------------------------------------------------------------
British Pound 2/11/98          6,500,000         $10,696,400         ($219,245)
British Pound 2/18/98         31,000,000          50,995,000          (706,645)
British Pound 2/19/98          9,000,000          14,805,000           216,000
Dutch Guilder 2/18/98          6,500,000           3,218,300          (107,359)
Dutch Guilder 2/19/98         26,000,000          12,873,836           (78,561)
French Franc 1/20/98           5,500,000             914,244            16,067
French Franc 2/18/98          58,000,000           9,657,492          (318,673)
French Franc 3/18/98          30,000,000           5,003,085           155,099
German Deutschemark 1/9/98    10,000,000           5,564,211            79,130
German Deutschemark 1/15/98    5,000,000           2,783,345            76,413
German Deutschemark 2/3/98       300,000             167,205             2,190
German Deutschemark 2/18/98    3,100,000           1,729,235           (56,363)
Japanese Yen 1/20/98       1,237,000,000           9,490,112         1,654,032
Japanese Yen 2/18/98       1,550,000,000          11,891,938         1,342,817
Japanese Yen 3/18/98       3,290,000,000          25,242,625         3,233,595
Japanese Yen 3/25/98         350,000,000           2,685,415           111,320
Japanese Yen 4/22/98       1,490,000,000          11,432,667           248,715
Swedish Krona 1/20/98         25,000,000           3,153,818            97,157
Swedish Krona 2/2/98          22,000,000           2,776,481            73,962
Swedish Krona 2/11/98         23,662,000           2,986,947            28,966
Swiss Franc 1/20/98            6,000,000           4,115,226            74,718
Swiss Franc 2/18/98              500,000             344,139            (4,511)
Swiss Franc 2/19/98            6,000,000           4,130,240             1,991
Swiss Franc 2/26/98            1,020,000             702,673            30,086
- --------------------------------------------------------------------------------
Total                                           $197,359,634        $5,950,901
================================================================================

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

      JANUS ASPEN BALANCED PORTFOLIO Portfolio Manager, Blaine P. Rollins

The Year in Review

I am pleased with the Portfolio's performance for the year, which I attribute to
a  heavy  emphasis  on  equities  initially  and  an  increased   investment  in
fixed-income securities during the final four months.

- --------------------------------------------------------------------------------
Portfolio Asset Mix               December 31, 1997      December 31, 1996
Equities                                 47.8%                  50.3%
Number of Stocks                           65                    103
Top 10 Equities                          17.7%                  24.0%
Fixed-Income Securities                    60                     32
  U.S. Treasury Notes/Bonds              18.9%                  15.7%
  Investment-Grade Corp. Bonds            8.6%                  16.0%
  High-Yield Corporate Bonds              4.3%                   5.6%
  Foreign Corporate Bonds                 0.8%                    --
Preferred Stock                           8.3%                   3.6%
Cash & Cash Equivalents                  11.3%                   8.8%
- --------------------------------------------------------------------------------

The fixed-income  portion of the Portfolio is highly diversified,  with a mix of
U.S.  Treasury issues as well as  investment-grade,  convertible,  preferred and
high-yield  corporate  securities.  When-ever  possible,  I relied  upon  Janus'
rigorous equity research to help evaluate the potential of a security.

The year  started  off with  considerable  volatility  in  interest  rates and a
flattening  of the yield  curve as  short-term  rates  rose more than  long-term
rates.  I focused on  relatively  short-term  securities,  mostly in the two- to
five-year  range.  My  objective  was to limit price  volatility  and maintain a
competitive yield. By September,  economic growth moderated, and the bond market
rallied. Yields on 10-year Treasuries dropped significantly, from 6.42% early in
January to 5.74% at year-end.

Taking  advantage of the  resurgence in bonds, I purchased a wide variety of new
10-year  Treasuries and A-rated corporate  securities,  thereby  lengthening the
overall  maturity and duration of our fixed-income  investments.  The high-yield
segment of the market  performed  very well during the last three  months and we
took  advantage  of sizable  gains from our  holdings  in Time  Warner,  Houston
Industries and TCI Preferred Convertible.

Approximately  8.6%  of the  bond  portfolio  remains  invested  in  well-known,
investment-grade  corporate  credits such as Walt Disney Co.,  IBM  Corporation,
Lockheed Martin and Royal Caribbean Cruises, Ltd.

Stock Highlights

Our equity  strategy is centered  around  high-quality  companies  that generate
large amounts of  discretionary  cash and invest it  effectively,  either in the
company itself or in high-return  acquisitions  that fit well with the company's
business strategy.

We owned a broad  spectrum of financial  stocks when the period began.  Although
the majority were good contributors to the bottom line,  valuations had expanded
to risky  levels.  We chose not to get greedy and reduced  our  exposure to this
area.  Swiss Life, a large Swiss  insurer,  was an exception.  I increased  this
position  because  of  the  company's  growing  presence  in the  European  life
insurance market. The company is also underfollowed by the investment community,
has a strong balance sheet, and was selling at very reasonable prices.

We reinvested our profits in energy,  technology,  cable TV and retail companies
that have very  competitive,  if not  dominant,  positions  in their  respective
industries.

The  technology  sector as a whole declined  20%-40% during the fourth  quarter,
largely because of concerns about the long-term  impact of the financial woes in
Southeast Asia. However,  this was not necessarily bad news. The highest-quality
names fared better than most, and we were able to purchase a number of positions
in  these  blue-chip  companies  at more  attractive  prices.  Among  the top 10
holdings in the Portfolio are Cisco Systems,  the leader in computer  networking
equipment;  Texas Instruments,  a top-notch supplier of semiconductor chips; and
Microsoft,  the world's premier  provider of operating  systems and software for
personal computers.

Like technology,  oil services stocks did not perform well in the latter part of
the year.  Speculation  about  very low  inflation  or even  disinflation  and a
worldwide economic slowdown helped to bring prices down.  Nonetheless,  I remain
bullish on this group. I am particularly  excited by the prospects for companies
conducting  deep-water offshore drilling and the companies that supply them with
drilling equipment.  For instance,  Halliburton Company's new technology for oil
and gas exploration is making  production  increasingly  cost-effective.

In the retail sector,  we selected  companies  generating  strong cash flows and
solid returns on capital from their internal operations.  A good example of this
is Dayton Hudson Corporation, which is benefiting from the success of its Target
stores subsidiary.

We experienced a few  disappointments  during the period,  including  Cincinnati
Bell,  which we sold at a loss. The stock came under pressure  because of fierce
competition in the telephone services and telemarketing business.

Current Outlook

I  anticipate  a good  though  by no means  record-setting  year in  1998.  U.S.
industries may well be pressured as Asian govern-ments and businesses work their
way through the current difficulties. In this case, it will be very important to
own  companies   whose  earnings   stream  is  very  visible  and   historically
predictable.  On the other hand,  interest  rates should  remain stable or trend
slightly  lower,   which  would  provide  greater   opportunities   for  capital
appreciation in our  fixed-income  investments now that the maturities have been
stretched.

Thank you for your continued investment in Janus Aspen Balanced Portfolio.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

      JANUS ASPEN BALANCED PORTFOLIO Portfolio Manager, Blaine P. Rollins

- --------------------------------------------------------------------------------
Average Annual Total Return(1)
For the Periods Ended December 31, 1997
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 9/13/93)
  1 Year                                                22.10%
  From Inception                                        16.33%
- --------------------------------------------------------------------------------
S&P 500 Index
  1 Year                                                33.35%
  From Inception Date
    of Institutional Shares                             21.77%
- --------------------------------------------------------------------------------
Lehman Brothers Govt./Corp. Bond Index
  1 Year                                                 9.76%
  From Inception Date
    of Institutional Shares                              6.31%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                   --
  From Inception                                        16.92%
- --------------------------------------------------------------------------------
Note: Performance of the Retirement  Shares is lower from the performance  shown
      on this graph for the  Institutional  Shares,  based upon the higher  fees
      paid by shareholders investing in this class.
- --------------------------------------------------------------------------------

Performance Overview(1)          Source - Lipper Analytical Services, Inc. 1997.

GRAPHIC

A graphic comparison of the change in value of a hypothetical $10,000 investment
in Janus Aspen Balanced  Portfolio - Institutional  Shares,  the Lehman Brothers
Government/Corporate  Bond Index and the S&P 500  Index.  Janus  Aspen  Balanced
Portfolio -  Institutional  Shares is  represented  by a solid  black line.  The
Lehman Brothers Government/Corporate Bond Index is represented by a dashed black
line.  The S&P 500 Index is  represented  by a short dashed black line.  The "y"
axis reflects the value of the investment. The "x" axis reflects the computation
periods from inception, September 13, 1993, through December 31, 1997. The upper
right quadrant reflects the ending value of the hypothetical investment in Janus
Aspen Balanced  Portfolio -  Institutional  Shares  ($19,138) as compared to the
Lehman  Brothers  Government/Corporate  Bond Index  ($13,002)  and S&P 500 Index
($23,286).

(1)  All returns reflect reinvested  dividends.  The Portfolio's  securities may
     differ significantly from the securities in the Index. Index returns do not
     include  taxes or  dividends  and interest  payments or operating  expenses
     necessary to maintain a portfolio  consisting of the same  securities  that
     are in the Index.  These returns do not reflect the charges and expenses of
     any particular  insurance product or qualified plan.  Investment return and
     principal value will fluctuate so that shares, when redeemed,  may be worth
     more or less than their  original cost.  The advisor  voluntarily  waives a
     portion of the Portfolio's  expenses.  Without such waiver, the Portfolio's
     total returns for each class would have been lower.  Past  performance does
     not guarantee future results.

                JANUS ASPEN BALANCED PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Common Stock - 47.8%
- --------------------------------------------------------------------------------
Aerospace and Defense - 0.1%
      17,175    DONCASTERS PLC (ADR)*                               $    362,822
- --------------------------------------------------------------------------------
Airlines - 0.5%
      76,025    Ryanair Holdings PLC (ADR)*                            1,910,128
- --------------------------------------------------------------------------------
Chemicals - Diversified - 1.6%
      54,200    Monsanto Co.                                           2,276,400
     129,165    Solutia, Inc.                                          3,447,091
- --------------------------------------------------------------------------------
                                                                       5,723,491
- --------------------------------------------------------------------------------
Circuits - 2.6%
      80,475    Linear Technology Corp.                                4,637,372
     143,150    Maxim Integrated Products, Inc.*                       4,938,675
- --------------------------------------------------------------------------------
                                                                       9,576,047
- --------------------------------------------------------------------------------
Commercial Banks - 0.9%
       7,500    Northern Trust Corp.                                     523,125
      43,725    Star Banc Corp.                                        2,508,722
- --------------------------------------------------------------------------------
                                                                       3,031,847
- --------------------------------------------------------------------------------
Computer Services - 0.5%
      51,175    Gartner Group, Inc. - Class A*                         1,906,269
- --------------------------------------------------------------------------------
Computer Software - 7.1%
     148,025    Cadence Design Systems, Inc.*                          3,626,613
      49,675    Microsoft Corp.*                                       6,420,494
     168,150    Parametric Technology Co.*                             7,966,106
     193,850    Wind River Systems*                                    7,693,422
- --------------------------------------------------------------------------------
                                                                      25,706,635
- --------------------------------------------------------------------------------
Computers - Micro - 1.0%
      44,525    Dell Computer Corp.*                                   3,740,100
- --------------------------------------------------------------------------------
Containers - Paper and Plastic - 0.2%
      12,400    Sealed Air Corp.*                                        765,700
- --------------------------------------------------------------------------------
Cruise Lines - 1.5%
      37,725    Carnival Corp. - Class A                            $  2,089,022
      65,100    Royal Caribbean Cruises, Ltd.                          3,470,644
- --------------------------------------------------------------------------------
                                                                       5,559,666
- --------------------------------------------------------------------------------
Diversified Financial Services - 0.7%
      80,050    CIT Group, Inc. - Class A*                             2,581,613
- --------------------------------------------------------------------------------
Diversified Operations - 2.8%
     106,575    CBS Corp.                                              3,137,302
      53,450    Minnesota Mining and Manufacturing Co.                 4,386,241
      78,405    Siebe PLC**                                            1,541,641
      17,400    Unilever N.V. - N.Y. Shares                            1,086,413
- --------------------------------------------------------------------------------
                                                                      10,151,597
- --------------------------------------------------------------------------------
Electronic Components - Semiconductors - 2.1%
      15,250    Intel Corp.                                            1,071,312
     148,450    Texas Instruments, Inc.                                6,680,250
- --------------------------------------------------------------------------------
                                                                       7,751,562
- --------------------------------------------------------------------------------
Electronic Safety Devices - 0.3%
      16,925    Pittway Corp. - Class A                                1,178,403
- --------------------------------------------------------------------------------
Finance - Investment Bankers/Brokers - 1.2%
      81,962    Charles Schwab Corp.                                   3,437,281
      12,050    Morgan Stanley, Dean Witter, Discover and Co.            712,456
- --------------------------------------------------------------------------------
                                                                       4,149,737
- --------------------------------------------------------------------------------
Finance - Other Services - 0.3%
      26,675    HealthCare Financial Partners, Inc.*                     946,963
- --------------------------------------------------------------------------------
Human Resources - 1.0%
      67,075    Robert Half International, Inc.*                       2,683,000
      33,075    Romac International, Inc.*                               808,270
- --------------------------------------------------------------------------------
                                                                       3,491,270
- --------------------------------------------------------------------------------
Instruments - Scientific - 1.5%
     105,925    Dionex Corp.*                                          5,322,731
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

                JANUS ASPEN BALANCED PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Internet Software - 0.1%
       4,100    America Online, Inc.*                               $    365,669
- --------------------------------------------------------------------------------
Life and Health Insurance - 2.8%
      11,343    Schweizerishe Lebensversicherungs-und
                  Rentenanstalt                                        8,920,100
      24,225    UNUM Corp.                                             1,317,234
- --------------------------------------------------------------------------------
                                                                      10,237,334
- --------------------------------------------------------------------------------
Machinery - Pumps - 0.1%
      13,125    Pfeiffer Vacuum Technology A.G. (ADR)*                   365,859
- --------------------------------------------------------------------------------
Manufacturing - 0.2%
      31,100    Roper Industries, Inc.                                   878,575
- --------------------------------------------------------------------------------
Medical - Drugs - 3.3%
       7,100    Bristol-Myers Squibb Co.                                 671,837
      52,625    Eli Lilly and Co.                                      3,664,016
      34,725    Pfizer, Inc.                                           2,589,183
       8,800    SmithKline Beecham PLC (ADR)                             452,650
      38,200    Warner-Lambert Co.                                     4,736,800
- --------------------------------------------------------------------------------
                                                                      12,114,486
- --------------------------------------------------------------------------------
Money Center Banks - 2.7%
      28,975    Bank of New York Co., Inc.                             1,675,117
       8,050    BankAmerica Corp.                                        587,650
     113,067    Barclays PLC**                                         3,015,325
     336,882    Lloyds TSB Group PLC**                                 4,390,433
- --------------------------------------------------------------------------------
                                                                       9,668,525
- --------------------------------------------------------------------------------
Multimedia - 0.5%
      51,950    Meredith Corp.                                         1,853,966
- --------------------------------------------------------------------------------
Music/Clubs - 0.4%
      53,100    Steinway Musical Instruments, Inc.*                    1,227,937
- --------------------------------------------------------------------------------
Networking Products - 1.6%
     104,963    Cisco Systems, Inc.*                                   5,851,659
- --------------------------------------------------------------------------------
Oil - Field Services - 1.4%
      64,875    Halliburton Co.                                        3,369,445
      31,400    Stolt Comex Seaway S.A.*                               1,570,000
- --------------------------------------------------------------------------------
                                                                       4,939,445
- --------------------------------------------------------------------------------
Oil and Gas Drilling - 1.2%
      80,775    Santa Fe International Corp.                           3,286,533
      21,950    Transocean Offshore, Inc.                              1,057,716
- --------------------------------------------------------------------------------
                                                                       4,344,249
- --------------------------------------------------------------------------------
Oil Field Machinery and Equipment - 2.3%
      40,875    Camco International, Inc.                              2,603,227
      39,450    Schlumberger, Ltd.                                     3,175,725
      42,725    Smith International, Inc.*                             2,622,247
- --------------------------------------------------------------------------------
                                                                       8,401,199
- --------------------------------------------------------------------------------
Power Converters and Power Supply Equipment - 0.4%
      68,125    American Power Conversion Corp.*                       1,609,453
- --------------------------------------------------------------------------------
Retail - Consumer Electronics - 0.8%
      91,300    CompUSA, Inc.*                                         2,830,300
- --------------------------------------------------------------------------------
Retail - Discount - 0.7%
      80,200    Family Dollar Stores, Inc.                             2,350,863
- --------------------------------------------------------------------------------
Retail - Hypermarkets - 1.6%
     124,775    Costco Companies, Inc.*                                5,568,084
- --------------------------------------------------------------------------------
Retail - Major Department Stores - 1.1%
      59,875    Dayton Hudson Corp.                                    4,041,563
- --------------------------------------------------------------------------------
Retail - Regional Department Stores - 0.2%
      22,350    Fred Meyer, Inc.*                                        812,981
- --------------------------------------------------------------------------------
Savings/Loan/Thrifts - 0.2%
      14,116    FFLC Bancorp, Inc.                                       307,023
      26,450    Home Bancorp of Elgin, Inc.                              472,794
- --------------------------------------------------------------------------------
                                                                         779,817
- --------------------------------------------------------------------------------
Toys - 0.3%
      31,575    Mattel, Inc.                                        $  1,176,169
- --------------------------------------------------------------------------------
Total Common Stock (cost $157,291,671)                               173,274,714
- --------------------------------------------------------------------------------
Corporate Bonds - 12.3%
- --------------------------------------------------------------------------------
Aerospace and Defense - 0.3%
  $1,200,000    Lockheed Martin Corp., 6.55%
                  company guaranteed unsecured notes,
                  due 5/15/99                                          1,206,000
- --------------------------------------------------------------------------------
Computers - Mainframe - 0.5%
   2,000,000    IBM Corp., 6.375%
                  global notes, due 6/15/00                            2,015,000
- --------------------------------------------------------------------------------
Cruise Lines   0.4%
   1,300,000    Royal Caribbean Cruises, Ltd., 7.00%
                  senior notes, due 10/15/07                           1,316,250
- --------------------------------------------------------------------------------
Diversified Financial Services - 0.6%
   2,000,000    Associates Corp. of North America, 6.75%
                  senior notes, due 7/15/01                            2,035,000
- --------------------------------------------------------------------------------
Finance - Investment Bankers/Brokers - 0.1%
     300,000    Lehman Brothers Holdings, Inc., 6.85%
                  notes, due 10/8/99                                     303,519
     100,000    Merrill Lynch & Co., Inc., 6.375%
                  notes, due 3/30/99                                     100,500
- --------------------------------------------------------------------------------
                                                                         404,019
- --------------------------------------------------------------------------------
Finance - Leasing Companies - 0.6%
     350,000    AT&T Capital Corp., 6.39%
                  medium term notes, due 1/22/99                         351,750
   1,800,000    Ryder Trucks, Inc., 10.00%
                  senior subordinated notes, due 12/1/06               1,804,500
- --------------------------------------------------------------------------------
                                                                       2,156,250
- --------------------------------------------------------------------------------
Finance - Mortgage Loan Banker - 0.9%
   3,200,000    Fannie Mae, 6.41%,
                  medium term notes, due 3/8/06                        3,268,000
- --------------------------------------------------------------------------------
Finance - Other Services - 0.3%
   1,000,000    Sears, Roebuck and Co., 6.50%
                  notes, due 6/15/00                                   1,008,750
- --------------------------------------------------------------------------------
Multi-Line Insurance - 0.3%
   1,000,000    Loews Corp., 3.125%
                  subordinated notes, due 9/15/07                        997,500
- --------------------------------------------------------------------------------
Multimedia - 2.9%
   8,000,000    Time Warner, Inc., 8.11%
                  notes, due 8/15/06                                   8,676,000
   2,000,000    Walt Disney Co. (The), 6.375%
                  senior notes, due 3/30/01                            2,017,500
- --------------------------------------------------------------------------------
                                                                      10,693,500
- --------------------------------------------------------------------------------
Oil and Gas Drilling - 0.9%
   2,576,000    Diamond Offshore Drilling, Inc., 3.75%
                  subordinated notes, due 2/15/07                      3,451,840
- --------------------------------------------------------------------------------
Paint and Related Products - 0.1%
     190,000    Sherwin-Williams Co., 6.25%
                  notes, due 2/1/00                                      190,713
- --------------------------------------------------------------------------------
Pharmacy Services - 1.4%
   5,195,000    Omnicare, Inc., 5.00%
                  subordinated debentures, due 12/01/07+               5,169,025
- --------------------------------------------------------------------------------
Retail - Office Supplies - 1.0%
   4,170,000    Corporate Express, Inc., 4.50%
                  notes, due 7/1/00                                    3,653,962
- --------------------------------------------------------------------------------
Shipbuilding - 0.3%
                Newport News Shipbuilding, Inc.:
     750,000      8.625%, senior notes, due 12/1/06                      789,375
     250,000      9.25%, senior subordinated notes,
                    due 12/1/06                                          265,000
- --------------------------------------------------------------------------------
                                                                       1,054,375
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

                JANUS ASPEN BALANCED PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Telecommunication Services - 0.8%
 $ 2,415,000    Qwest Communications International, 10.875%
                  senior notes, due 4/1/07+                          $ 2,722,912
- --------------------------------------------------------------------------------
Television - 0.4%
   1,250,000    Sinclair Broadcast Group, Inc., 10.00%,
                  senior subordinated notes, due 9/30/05               1,312,500
- --------------------------------------------------------------------------------
Transportation - Railroad - 0.5%
   2,000,000    Union Pacific Corp., 6.25%
                  notes, due 3/15/99                                   2,002,500
- --------------------------------------------------------------------------------
Total Corporate Bonds (cost $44,842,095)                              44,658,096
- --------------------------------------------------------------------------------
Foreign Bonds - 0.8%
DEM
   5,075,000    ITT Promedia, 9.125%
                  senior subordinated notes, due 9/15/07
                  (cost $2,863,753)                                    2,956,583
- --------------------------------------------------------------------------------
Preferred Stock - 8.3%
- --------------------------------------------------------------------------------
Automotive - Truck Parts and Equipment - 1.2%
      90,000    Federal-Mogul Financial Trust, 7.00%+                  4,545,000
- --------------------------------------------------------------------------------
Broadcast Services and Programming - 1.7%
      36,683    TCI Pacific Communications, 5.00%                      6,052,695
- --------------------------------------------------------------------------------
Cable Television - 1.6%
     100,000    Houston Industries, Inc., 7.00%                        5,706,250
- --------------------------------------------------------------------------------
Cruise Lines - 2.0%
      84,702    Royal Caribbean Cruises, Ltd., 7.25%                   7,204,964
- --------------------------------------------------------------------------------
Diversified Operations - 1.1%
   1,800,000    Williams Holdings PLC, 8.00%**                         3,850,236
- --------------------------------------------------------------------------------
Electric - Generation - 0.5%
      40,000    AES Trust II, 5.50%+                                   2,055,000
- --------------------------------------------------------------------------------
Insurance Brokers - 0.2%
      23,000    Hartford Capital I - Series A, 7.70%                     572,125
- --------------------------------------------------------------------------------
Total Preferred Stock (cost $26,392,405)                              29,986,270
- --------------------------------------------------------------------------------
Asset Backed Securities - 0.3%
 $   320,000    Case Equipment Loan Trust, 6.45%
                  Series 1997 - A, Class A3, due 3/15/04                 324,102
     375,000    Discover Card Master Trust I, 5.40%
                  Series 1993-2, Class A, due 11/16/01                   372,773
     385,000    Standard Credit Card Master Trust, 5.50%
                  Series 1993-3, Class A,, due 1/7/99                    382,471
- --------------------------------------------------------------------------------
Total Asset Backed Securities (cost $1,077,788)                        1,079,346
- --------------------------------------------------------------------------------
Collateralized Mortgage Obligations - 0.3%
     400,000    Fannie Mae, 6.50%,
                  Series 1997-60, Class PG, due 9/18/97                  391,188
     249,167    Freddie Mac, 9.00%
                  Pass-Through, Pool BOO623, due 6/1/06                  258,032
     350,000    Freddie Mac/Government National
                  Mortgage Association, 6.50%
                  Series 43, Class PG, due 12/17/22+                     351,312
- --------------------------------------------------------------------------------
Total Collateralized Mortgage Obligations
  (cost $1,001,574)                                                    1,000,532
- --------------------------------------------------------------------------------
U.S. Government Obligations - 18.9%
                U.S. Treasury Notes/Bonds:
   1,250,000      6.125%, due 5/15/98                                  1,253,037
     950,000      5.875%, due 10/31/98                                   951,757
   4,030,000      5.50%, due 11/15/98                                  4,026,252
     170,000      6.25%, due 3/31/99                                     171,231
     780,000      6.375%, due 4/30/99                                    787,145
   4,100,000      6.375%, due 5/15/99                                  4,138,253
   6,600,000      6.25%, due 5/31/99                                   6,652,668
     950,000      6.125%, due 12/31/01                                   962,207
   2,570,000      6.25%, due 1/31/02                                   2,615,283
   6,500,000      6.625%, due 4/30/02                                  6,710,340
- --------------------------------------------------------------------------------
U.S. Government Obligations - (continued)
 $ 6,600,000      5.75%, due 10/31/02                               $  6,603,564
   1,890,000      6.25%, due 2/15/03                                   1,932,544
   1,700,000      7.25%, due 5/15/04                                   1,834,079
   1,225,000      7.50%, due 2/15/05                                   1,346,422
     700,000      6.50%, due 5/15/05                                     729,386
     500,000      5.875%, due 11/15/05                                   502,605
   1,630,000      6.875%, due 5/15/06                                  1,743,692
     525,000      7.00%, due 7/15/06                                     566,591
   5,000,000      6.625%, due 5/15/07                                  5,291,400
  13,000,000      6.125%, due 8/15/07                                 13,356,590
     770,000      10.625%, due 8/15/15                                 1,157,287
   2,480,000      9.25%, due 2/15/16                                   3,365,038
      80,000      8.50%, due 2/15/20                                     104,022
   3,000,000    U.S. Treasury Strips
                  zero coupon, due 5/15/06                             1,854,510
- --------------------------------------------------------------------------------
Total U.S. Government Obligations (cost $67,774,822)                  68,655,903
- --------------------------------------------------------------------------------
U.S. Government Agencies - 13.5%
                Freddie Mac:
  23,800,000      6.00%, 1/2/98                                       23,796,033
  25,000,000      5.70%, 1/9/98                                       24,968,333
- --------------------------------------------------------------------------------
Total U.S. Government Agencies (amortized cost $48,764,366)           48,764,366
- --------------------------------------------------------------------------------
Total Investments (total cost $350,008,474) - 102.2%                 370,375,810
- --------------------------------------------------------------------------------
Liabilities, net of Cash, Receivables and Other Assets - (2.2%)      (7,955,207)
- --------------------------------------------------------------------------------
Net Assets - 100%                                                   $362,420,603
- --------------------------------------------------------------------------------

                       Summary of Investments by Country
                               December 31, 1997

Country                       % of Investment Securities    Market Value
- --------------------------------------------------------------------------------
Belgium                                    0.8%             $  2,956,583
Germany                                    0.1%                  365,859
Ireland                                    0.5%                1,910,128
Netherlands                                0.3%                1,086,413
Switzerland                                2.4%                8,920,100
United Kingdom                             4.1%               15,183,107
United States ++                          91.8%              339,953,620
- --------------------------------------------------------------------------------
Total                                    100.0%             $370,375,810
================================================================================
++ Includes Short-Term Securities (78.6% excluding Short-Term Securities)

                           Forward Currency Contracts
                           Open at December 31, 1997

Currency Sold and               Currency            Currency        Unrealized
Settlement Date               Units Sold      Value in $ U.S.       Gain/(Loss)
- --------------------------------------------------------------------------------
British Pound 2/11/98            380,000         $   625,328         ($ 21,243)
British Pound 2/18/98             46,000              75,670            (3,005)
- --------------------------------------------------------------------------------
Total                                            $   700,998         ($ 24,248)
================================================================================

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

    JANUS ASPEN EQUITY INCOME PORTFOLIO Portfolio Manager, Blaine P. Rollins

Market Review

Equity performance in 1997 can be separated into three distinct periods.  During
the first four months, the market favored the largest,  most liquid stocks. From
May (when the Portfolio was introduced) through October,  performance  broadened
significantly.  Stocks of all sizes were evaluated on their  individual  merits,
not  just  their  market   capitalizations,   and  many  smaller  stocks  posted
substantial gains.  Finally,  from late October through year-end,  the financial
crisis in  Southeast  Asia  impacted  markets in this  hemisphere,  resulting in
considerable volatility and a flight to the high-quality, liquid stocks.

Portfolio Review

In building the Portfolio, I sought out companies with several  characteristics:
historically predictable earnings, management that wants to increase shareholder
value, strong cash flow and consistently improving profitability.  In 1997, many
of the  companies  that met these  criteria were in the  financial,  technology,
retail and energy sectors.

- --------------------------------------------------------------------------------
Portfolio Asset Mix                         December 31, 1997
Equities                                           74.7%
Number of Stocks                                     69
Top 10 Equities                                    28.5%
Fixed-Income Securities
  Investment-Grade Corporate Bonds                  7.9%
  Preferred Stock                                   6.2%
Cash & Cash Equivalents                            11.2%
- --------------------------------------------------------------------------------

We began the year with a heavy allocation to financial  stocks,  primarily banks
and small thrifts.  Although they performed very well on the whole,  we took our
profits and trimmed most positions as the year progressed.  The reason:  Falling
interest  rates led to a surge in loan volume.  That,  in turn,  pushed up stock
prices for these companies.  If the economy slows down, loan defaults could rise
dramatically, impacting overall credit quality and depressing stock prices.

Two exceptions were Swiss Life, the largest  insurer in Switzerland,  and Morgan
Stanley Dean Witter.  Swiss Life (the largest  holding in the  Portfolio)  has a
very strong balance sheet,  excellent cash flow, and very reasonable  valuations
relative to its earnings  growth rate.  In addition,  I expect it to use some of
its extra cash to acquire  German and French  competitors.  Morgan  Stanley Dean
Witter   represents  the  marriage  of  two   outstanding   organizations   with
complementary  strengths and markets. I look for meaningful  synergies to evolve
from their merger.

During the second half of the year, my focus shifted to technology.  As a whole,
this sector was hard hit by the upheaval in Asia,  declining  20%-40% during the
fourth  quarter.  However,  the  highest-quality  names  withstood  the  general
downturn better than most, and we added a number of positions in these blue-chip
companies,  especially in October when the market deeply discounted their future
earnings  potential.  Among  the top 10  holdings  in the  Portfolio  are  Cisco
Systems,  the leader in computer  networking  equipment;  Texas  Instruments,  a
top-notch  supplier of semiconductor  chips; and Maxim  Integrated  Products,  a
dominant franchise in analog semiconductors.

Like technology,  oil services stocks did not perform well in the latter part of
the year.  Oil prices are sensitive to  inflation,  and the prospect of very low
inflation or even disinflation and a worldwide economic slowdown helped to bring
prices down.  Nonetheless,  I remain  bullish on this group.  I am  particularly
excited by the prospects for companies  conducting  deep-water offshore drilling
and the companies that supply them with drilling equipment.

With the growing  uncertainty  in Southeast  Asia, we  reexamined  the extent to
which each position in the Portfolio was dependent  upon those markets for sales
and revenues.  As a result,  we reduced or eliminated our holdings of some major
international companies, including Parker Hannifen and Philip Morris Companies.

Looking Ahead

I believe the Portfolio is well-positioned for the coming year. It contains many
top-quality  companies with outstanding  management teams and in industries that
stand to benefit from broad economic and secular  trends.  The volatility in the
market is likely to  persist,  so  outperforming  our  benchmark  and peers will
depend upon  making sure that we own  companies  that can  consistently  meet or
exceed earnings estimates.

Thank you for your continued investment in Janus Aspen Equity Income Portfolio.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

    JANUS ASPEN EQUITY INCOME PORTFOLIO Portfolio Manager, Blaine P. Rollins

- --------------------------------------------------------------------------------
Cumulative Total Return(1)
For the Periods Ended December 31, 1997
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 5/1/97)
  1 Year                                                   --
  From Inception                                        34.70%
- --------------------------------------------------------------------------------
S&P 500 Index
  1 Year                                                   --
  From Inception Date
    of Institutional Shares                             22.55%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                   --
  From Inception                                        34.20%
- --------------------------------------------------------------------------------
Note: Performance of the Retirement  Shares is lower from the performance  shown
      on this graph for the  Institutional  Shares,  based upon the higher  fees
      paid by shareholders investing in this class.
- --------------------------------------------------------------------------------

Performance Overview(1)          Source - Lipper Analytical Services, Inc. 1997.

GRAPHIC

A graphic comparison of the change in value of a hypothetical $10,000 investment
in Janus Aspen Equity Income  Portfolio -  Institutional  Shares and the S&P 500
Index. Janus Aspen Equity Income Portfolio - Institutional Shares is represented
by a solid black line.  The S&P 500 Index is represented by a dashed black line.
The "y" axis  reflects the value of the  investment.  The "x" axis  reflects the
computation periods from inception,  May 1, 1997, through December 31, 1997. The
upper right quadrant reflects the ending value of the hypothetical investment in
Janus Aspen Equity Income Portfolio - Institutional Shares ($13,470) as compared
to the S&P 500 Index ($12,255).

(1)  All returns reflect reinvested  dividends.  The Portfolio's  securities may
     differ significantly from the securities in the Index. Index returns do not
     include  taxes or  dividends  and interest  payments or operating  expenses
     necessary to maintain a portfolio  consisting of the same  securities  that
     are in the Index.  These returns do not reflect the charges and expenses of
     any particular  insurance product or qualified plan.  Investment return and
     principal value will fluctuate so that shares, when redeemed,  may be worth
     more or less than their  original cost.  The advisor  voluntarily  waives a
     portion of the Portfolio's  expenses.  Without such waiver, the Portfolio's
     total returns for each class would have been lower.  Past  performance does
     not guarantee future results.

             JANUS ASPEN EQUITY INCOME PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Common Stock - 74.7%
- --------------------------------------------------------------------------------
Advertising Sales - 0.2%
          31    PubliGroupe S.A.                                    $      6,780
- --------------------------------------------------------------------------------
Aerospace and Defense - 0.8%
         350    Alliant Techsystems, Inc.*                                19,513
         225    DONCASTERS PLC (ADR)*                                      4,753
- --------------------------------------------------------------------------------
                                                                          24,266
- --------------------------------------------------------------------------------
Airlines - 1.3%
       1,600    Ryanair Holdings PLC (ADR)*                               40,200
- --------------------------------------------------------------------------------
Automotive - Truck Parts and Equipment - 1.6%
       1,225    Federal-Mogul Corp.                                       49,612
- --------------------------------------------------------------------------------
Beverages - Wine and Spirits - 0.7%
         600    Beringer Wine Estates Holdings, Inc. - Class B*           22,800
- --------------------------------------------------------------------------------
Cable Television - 0.1%
         111    Tele-Communications, Inc. - Class A*                       3,101
- --------------------------------------------------------------------------------
Chemicals - Diversified - 3.1%
       1,225    Monsanto Co.                                              51,450
       1,675    Solutia, Inc.                                             44,702
- --------------------------------------------------------------------------------
                                                                          96,152
- --------------------------------------------------------------------------------
Circuits - 6.3%
       1,500    Linear Technology Corp.                                   86,437
       3,100    Maxim Integrated Products, Inc.*                         106,950
- --------------------------------------------------------------------------------
                                                                         193,387
- --------------------------------------------------------------------------------
Commercial Banks - 1.1%
         575    Star Banc Corp.                                           32,991
- --------------------------------------------------------------------------------
Computer Services - 1.0%
         825    Gartner Group, Inc. - Class A*                            30,731
- --------------------------------------------------------------------------------
Computer Software - 8.3%
       2,325    Cadence Design Systems, Inc.*                       $     56,963
         475    Microsoft Corp.*                                          61,394
       1,100    Parametric Technology Co.*                                52,113
       2,075    Wind River Systems*                                       82,352
- --------------------------------------------------------------------------------
                                                                         252,822
- --------------------------------------------------------------------------------
Computers - Micro - 1.6%
         575    Dell Computer Corp.*                                      48,300
- --------------------------------------------------------------------------------
Cruise Lines - 1.9%
       1,084    Royal Caribbean Cruises, Ltd.                             57,791
- --------------------------------------------------------------------------------
Diversified Financial Services - 1.5%
       1,450    CIT Group, Inc. - Class A*                                46,762
- --------------------------------------------------------------------------------
Diversified Operations - 3.5%
       1,525    CBS Corp.                                                 44,892
         695    Minnesota Mining and Manufacturing Co.                    57,033
         361    Siebe PLC                                                  7,098
- --------------------------------------------------------------------------------
                                                                         109,023
- --------------------------------------------------------------------------------
Electronic Components - Semiconductors - 3.8%
         175    Intel Corp.                                               12,294
       2,320    Texas Instruments, Inc.                                  104,400
- --------------------------------------------------------------------------------
                                                                         116,694
- --------------------------------------------------------------------------------
Electronic Measuring Instruments - 0.1%
          42    Simac Techniek N.V.                                        4,889
- --------------------------------------------------------------------------------
Finance - Investment Bankers/Brokers - 1.6%
         975    Charles Schwab Corp.                                      40,889
         125    Morgan Stanley, Dean Witter, Discover and Co.              7,391
- --------------------------------------------------------------------------------
                                                                          48,280
- --------------------------------------------------------------------------------
Food - Retail - 0.3%
         150    Quality Food Centers, Inc.*                               10,050
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

             JANUS ASPEN EQUITY INCOME PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Human Resources - 2.9%
         875    Robert Half International, Inc.*                    $     35,000
       2,225    Romac International, Inc.*                                54,373
- --------------------------------------------------------------------------------
                                                                          89,373
- --------------------------------------------------------------------------------
Instruments - Scientific - 1.6%
       1,000    Dionex Corp.*                                             50,250
- --------------------------------------------------------------------------------
Life and Health Insurance - 3.9%
         153    Schweizerishe Lebensversicherungs-und
                  Rentenanstalt                                          120,319
- --------------------------------------------------------------------------------
Machinery - Pumps - 0.3%
         325    Pfeiffer Vacuum Technology A.G. (ADR)*                     9,059
- --------------------------------------------------------------------------------
Manufacturing - 0.1%
          75    Roper Industries, Inc.                                     2,119
- --------------------------------------------------------------------------------
Medical - Drugs - 2.5%
         200    Eli Lilly and Co.                                         13,925
         500    Warner-Lambert Co.                                        62,000
- --------------------------------------------------------------------------------
                                                                          75,925
- --------------------------------------------------------------------------------
Medical Products - 0.3%
         225    Mentor Corp.                                               8,213
- --------------------------------------------------------------------------------
Money Center Banks - 2.4%
         100    BankAmerica Corp.                                          7,300
         923    Barclays PLC                                              24,615
       3,110    Lloyds TSB Group PLC                                      40,531
- --------------------------------------------------------------------------------
                                                                          72,446
- --------------------------------------------------------------------------------
Multimedia - 0.8%
         650    Meredith Corp.                                            23,197
- --------------------------------------------------------------------------------
Networking Products - 3.3%
       1,838    Cisco Systems, Inc.*                                     102,441
- --------------------------------------------------------------------------------
Oil - Field Services - 2.4%
         500    Halliburton Co.                                           25,969
         925    Stolt Comex Seaway S.A.*                                  46,250
- --------------------------------------------------------------------------------
                                                                          72,219
- --------------------------------------------------------------------------------
Oil and Gas Drilling - 0.7%
         500    Santa Fe International Corp.                              20,344
- --------------------------------------------------------------------------------
Oil Field Machinery and Equipment - 3.2%
         700    Camco International, Inc.                                 44,581
         325    Schlumberger, Ltd.                                        26,163
         425    Smith International, Inc.*                                26,084
- --------------------------------------------------------------------------------
                                                                          96,828
- --------------------------------------------------------------------------------
Power Converters and Power Supply Equipment - 1.2%
       1,525    American Power Conversion Corp.*                          36,028
- --------------------------------------------------------------------------------
Printing - Commercial - 0.4%
         500    World Color Press, Inc.*                                  13,281
- --------------------------------------------------------------------------------
Radio - 0.9%
         600    Heftel Broadcasting Corp.*                                28,050
- --------------------------------------------------------------------------------
Retail - Consumer Electronics - 1.3%
       1,250    CompUSA, Inc.*                                            38,750
- --------------------------------------------------------------------------------
Retail - Discount - 1.2%
         875    Family Dollar Stores, Inc.                                25,648
         325    Wal-Mart Stores, Inc.                                     12,817
- --------------------------------------------------------------------------------
                                                                          38,465
- --------------------------------------------------------------------------------
Retail - Hypermarkets - 1.9%
       1,275    Costco Companies, Inc.*                                   56,897
- --------------------------------------------------------------------------------
Retail - Major Department Stores - 0.7%
         300    Dayton Hudson Corp.                                       20,250
- --------------------------------------------------------------------------------
Television - 1.7%
         750    Univision Communications, Inc.*                           52,359
- --------------------------------------------------------------------------------
Toys - 1.7%
         850    Hasbro, Inc.                                        $     26,775
         675    Mattel, Inc.                                              25,144
- --------------------------------------------------------------------------------
                                                                          51,919
- --------------------------------------------------------------------------------
Transportation - Air Freight - 0.5%
         225    Airborne Freight Corp.                                    13,978
- --------------------------------------------------------------------------------
Total Common Stock (cost $2,223,513)                                   2,287,341
- --------------------------------------------------------------------------------
Corporate Bonds - 7.9%
- --------------------------------------------------------------------------------
Multi-Line Insurance - 0.8%
     $25,000    Loews Corp., 3.125%
                  subordinated notes, due 9/15/07                         24,938
- --------------------------------------------------------------------------------
Oil and Gas Drilling - 3.1%
      70,000    Diamond Offshore Drilling, Inc., 3.75%
                  subordinated notes, due 2/15/07                         93,809
- --------------------------------------------------------------------------------
Pharmacy Services - 2.1%
      65,000    Omnicare, Inc., 5.00%
                  subordinated debentures, due 12/01/07                   64,675
- --------------------------------------------------------------------------------
Retail - Office Supplies - 1.9%
      65,000    Corporate Express, Inc., 4.50%
                  notes, due 7/1/00                                       56,951
- --------------------------------------------------------------------------------
Total Corporate Bonds (cost $250,080)                                    240,373
- --------------------------------------------------------------------------------
Preferred Stock - 6.2%
- --------------------------------------------------------------------------------
Broadcast Services and Programming - 2.1%
         400    TCI Pacific Communications, 5.00%                         66,000
- --------------------------------------------------------------------------------
Cable Television - 2.7%
       1,425    Houston Industries, Inc., 7.00%                           81,314
- --------------------------------------------------------------------------------
Cruise Lines - 0.4%
         150    Royal Caribbean Cruises, Ltd., 7.25%                      12,759
- --------------------------------------------------------------------------------
Electric - Generation - 1.0%
         600    AES Trust II, 5.50%+                                      30,825
- --------------------------------------------------------------------------------
Total Preferred Stock (cost $165,226)                                    190,898
- --------------------------------------------------------------------------------
U.S. Government Agency - 10.1%
                Freddie Mac
    $308,000      6.00%, 1/2/98 (amortized cost $307,949)                307,949
- --------------------------------------------------------------------------------
Total Investments (total cost $2,946,768) - 98.9%                      3,026,561
- --------------------------------------------------------------------------------
Cash, Receivables and Other Assets, net of Liabilities - 1.1%             33,712
- --------------------------------------------------------------------------------
Net Assets - 100%                                                     $3,060,273
- --------------------------------------------------------------------------------

                       Summary of Investments by Country
                               December 31, 1997

Country                       % of Investment Securities    Market Value
- --------------------------------------------------------------------------------
Ireland                                    1.3%             $     40,200
Netherlands                                0.2%                    4,889
Switzerland                                4.2%                  127,098
United Kingdom                             2.2%                   68,015
United States++                           92.1%                2,786,359
- --------------------------------------------------------------------------------
Total                                    100.0%             $  3,026,561
================================================================================
++ Includes Short-Term Securities (81.9% excluding Short-Term Securities)

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

                     JANUS ASPEN FLEXIBLE INCOME PORTFOLIO
          Portfolio Managers, Sandy R. Rufenacht and Ronald V. Speaker

The Year in Review

The U.S. bond market went through two very distinct periods in 1997. As the year
began,  declining  unemployment rates, strong housing and auto sales, and rising
wages in the U.S. (all signs of rapid economic  expansion)  fueled concern about
higher inflation. To rein in inflationary pressures,  the Federal Reserve raised
interest rates by 25 basis points (0.25%) in March.

The second half of the year proved vastly  different.  Growth  moderated,  and a
change in investor  psychology  was brought on by positive news on the inflation
front.  Increased  productivity  and a decline in oil prices also contributed to
this favorable scenario.  From September onward, as the Federal Reserve remained
on the sidelines, the bond market rallied.

Finally, an international  currency crisis that accelerated in Southeast Asia in
late October  raised  concerns about global growth rates and sparked a flight to
U.S. markets, which are viewed as a "safe haven" in times of turmoil. The influx
of capital helped drive yields to near-record  lows by late December.  Yields on
30-year Treasury securities, which peaked at 7.17% in the first quarter, dropped
to 5.92% by year-end.  Ten-year  Treasuries  fell from 6.42% early in January to
5.74% at year-end.

- --------------------------------------------------------------------------------
Portfolio Asset Mix               December 31, 1997      December 31, 1996
Investment-Grade Corporate Bonds         26.9%                  49.5%
High-Yield/High-Risk Bonds               39.9%                  27.0%
U.S. Government Obligations              20.9%                  11.9%
Preferred Stock                           0.6%                   1.3%
Cash & Cash Equivalents                  11.7%                  10.3%
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
Portfolio Profile
Weighted Average Maturity               9.2 Yrs.               8.4 Yrs.
Average Modified Duration*              5.8 Yrs.               5.5 Yrs.
30-Day Average Yield
  Institutional Shares**                 6.85%                  7.39%
  Retirement Shares**                    6.32%                   N/A
Average Rating                            BBB+                   BBB
- --------------------------------------------------------------------------------
 * A theoretical measure of price volatility.
** Yields will fluctuate.

Portfolio Strategy

As in the past,  our diverse  strategy was a boon to the  Portfolio.  By using a
mixture of investment-grade  corporate bonds,  Treasury securities and carefully
chosen  high-yield  bonds, we were able to maximize  yield,  diversify risk, and
achieve some significant capital gains as interest rates declined.  We also used
the Portfolio's flexibility to increase overall credit quality during the course
of the year.

Our  investment-grade  holdings in particular  benefited from  fluctuating  and,
ultimately,  lower rates. We took advantage of periods when yields were high and
prices low to buy  top-quality  names such as IBM and Ford Motor Co.  When rates
later rose,  we chalked up solid gains in these and other highly  rated  issues.
Other  familiar  investment-grade  names  include  Time  Warner,  Coca-Cola  and
WorldCom, a leading telecommunications company planning to acquire long-distance
provider MCI.

Telecommunications  companies were an important part of our high-yield  strategy
as well and helped us to boost income and capital appreciation as interest rates
continued to fall. Deregulation, both in the U.S. and abroad, is fostering major
changes  to the  telecommunications  industry,  including  merger  and  takeover
activity and significant opportunities for operators.

We are particularly excited about new  telecommunications  possibilities outside
the U.S. Metronet, a local exchange carrier in Canada, has established itself as
a strong competitor, and helped performance during the past year.

Another area of strong  performance  (in both  investment and  high-yield)  were
banks and financial  services.  We invested in Local Financial  Corporation,  an
Oklahoma-based thrift, whose high-yield bonds increased in price during the year
as the company improved its balance sheet.

Not all of our ideas worked out as well as these,  however.  Our position in Fox
Kids Worldwide, a television cartoon programmer,  declined moderately because of
its  misunderstood  credit and the announcement  that Disney was going to launch
its own network. The falloff occurred during a temporary downturn in the market,
and the security has not recovered as yet.

Looking to 1998

As we begin  1998,  we will  continue  to watch  the U.S.  economy  for signs of
inflation.  We will also keep a close eye on the impact of foreign economies and
emerging-market currency problems, as well as the evolving opportunities. Toward
that end, we bolstered our research staff to take advantage of  opportunities in
the international arena.

On balance, we believe that 1998 will be a good year for bond investors. At this
juncture,  inflation  is  falling  and  global  economic  growth  appears  to be
decelerating  from  the  above-average  rates  of  recent  years.  We  are  also
encouraged by the  improvement  in the U.S.  budget and the potential for budget
surpluses  in '98 and  beyond.  We expect  1998 to be a  favorable  year for our
disciplined, diversified approach to fixed-income investing.

Thank  you  for  your  continued  investment  in  Janus  Aspen  Flexible  Income
Portfolio.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

                     JANUS ASPEN FLEXIBLE INCOME PORTFOLIO
          Portfolio Managers, Sandy R. Rufenacht and Ronald V. Speaker

- --------------------------------------------------------------------------------
Average Annual Total Return(1)
For the Periods Ended December 31, 1997
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 9/13/93)
  1 Year                                                11.76%
  From Inception                                        10.05%
- --------------------------------------------------------------------------------
Lehman Brothers Govt./Corp. Bond Index
  1 Year                                                 9.76%
  From Inception Date
    of Institutional Shares                              6.31%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                   --
  From Inception                                         9.73%
- --------------------------------------------------------------------------------
Note: Performance of the Retirement  Shares is lower from the performance  shown
      on this graph for the  Institutional  Shares,  based upon the higher  fees
      paid by shareholders investing in this class.
- --------------------------------------------------------------------------------

Performance Overview(1)          Source - Lipper Analytical Services, Inc. 1997.

GRAPHIC

A graphic comparison of the change in value of a hypothetical $10,000 investment
in Janus Aspen Flexible Income  Portfolio - Institutional  Shares and the Lehman
Brothers  Government/Corporate Bond Index. Janus Aspen Flexible Income Portfolio
- - Institutional Shares is represented by a solid black line. The Lehman Brothers
Government/Corporate  Bond Index is  represented by a dashed black line. The "y"
axis reflects the value of the investment. The "x" axis reflects the computation
periods from inception, September 13, 1993, through December 31, 1997. The upper
right quadrant reflects the ending value of the hypothetical investment in Janus
Aspen Flexible Income Portfolio - Institutional  Shares ($15,083) as compared to
the Lehman Brothers Government/Corporate Bond Index ($13,002).

(1)  All returns reflect reinvested  dividends.  The Portfolio's  securities may
     differ significantly from the securities in the Index. Index returns do not
     include  taxes or  dividends  and interest  payments or operating  expenses
     necessary to maintain a portfolio  consisting of the same  securities  that
     are in the Index.  These returns do not reflect the charges and expenses of
     any particular  insurance product or qualified plan.  Investment return and
     principal value will fluctuate so that shares, when redeemed,  may be worth
     more or less than their original cost. Past  performance does not guarantee
     future results.

            JANUS ASPEN FLEXIBLE INCOME PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Corporate Bonds - 65.8%
- --------------------------------------------------------------------------------
Automotive - Cars and Light Trucks - 3.4%
$  1,000,000    Ford Motor Co., 7.25%
                  notes, due 10/1/08                                $  1,061,250
     750,000    General Motors Corp., 7.10%
                  notes, due 3/15/06                                     782,812
- --------------------------------------------------------------------------------
                                                                       1,844,062
- --------------------------------------------------------------------------------
Beverages - Non-Alcoholic - 0.9%
     500,000    Coca-Cola Enterprises, Inc., 6.95%
                  debentures, due 11/15/26                               511,250
- --------------------------------------------------------------------------------
Broadcast Services and Programming - 0.9%
     500,000    Fox Kids Worldwide, Inc., 9.25%
                  senior notes, due 11/1/07+                             483,750
- --------------------------------------------------------------------------------
Building and Construction Products - 0.8%
                USG Corp.:
     205,000      9.25%, senior notes, due 9/15/01                       220,631
     200,000      8.50%, senior notes, due 8/1/05                        215,000
- --------------------------------------------------------------------------------
                                                                         435,631
- --------------------------------------------------------------------------------
Cable Television - 1.9%
     500,000    Century Communications Corp., 8.375%
                  senior notes, due 12/15/07                             500,000
     500,000    Galaxy Telecom, L.P., 12.375%
                  senior subordinated notes, due 10/1/05                 550,000
- --------------------------------------------------------------------------------
                                                                       1,050,000
- --------------------------------------------------------------------------------
Casino Hotels - 1.4%
     750,000    Venetian Casino Resort, L.L.C., 12.25%
                  mortgage bonds, due 11/15/04                           751,875
- --------------------------------------------------------------------------------
Casino Services - 0.9%
     500,000    Isle of Capri Black Hawk, L.L.C., 13.00%
                  first mortgage bonds, due 8/31/04+                     505,625
- --------------------------------------------------------------------------------
Cellular Telecommunications - 0.9%
  $  500,000    Iridium, L.L.C./Capital Corp., 11.25%
                  senior notes, due 7/15/05                           $  493,750
- --------------------------------------------------------------------------------
Chemicals - Specialty - 0.9%
     500,000    Praxair, Inc., 6.90%
                  notes, due 11/1/06                                     516,875
- --------------------------------------------------------------------------------
Commercial Banks - 3.9%
     500,000    First National Bank of Omaha, 7.32%
                  subordinated notes, due 12/1/10                        513,125
     735,000    First Nationwide Holdings, Inc., 10.625%
                  senior subordinated notes, due 10/1/03                 821,362
     700,000    HUBCO, Inc., 8.20%
                  subordinated debentures, due 9/15/06                   750,750
- --------------------------------------------------------------------------------
                                                                       2,085,237
- --------------------------------------------------------------------------------
Commercial Services - 2.6%
     445,000    NeoData Services, Inc., 12.00%
                  senior notes, due 5/1/03                               476,706
     910,000    Pantry, Inc. (The), 10.25%
                  senior subordinated notes, due 10/15/07                930,475
- --------------------------------------------------------------------------------
                                                                       1,407,181
- --------------------------------------------------------------------------------
Computers - Mainframe - 2.8%
                IBM Corp.:
     500,000      6.45%, notes, due 8/1/07                               505,625
   1,000,000      7.00%, debentures, due 10/30/25                      1,032,500
- --------------------------------------------------------------------------------
                                                                       1,538,125
- --------------------------------------------------------------------------------
Containers - Metal and Glass - 1.6%
     500,000    Crown Cork & Seal Finance PLC, 7.00% company
                  guaranteed notes, due 12/15/06                         516,875
     350,000    Owens-Illinois, Inc., 7.85%
                  senior notes, due 5/15/04                              367,063
- --------------------------------------------------------------------------------
                                                                         883,938
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

            JANUS ASPEN FLEXIBLE INCOME PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Electric - Integrated - 1.3%
    $600,000    El Paso Electric Co., 9.40%
                  first mortgage bonds, due 5/1/11                    $  681,000
- --------------------------------------------------------------------------------
Engineering - Research and Development - 1.0%
     500,000    Intertek Finance PLC, 10.25%
                  senior subordinated notes, due 11/1/06                 522,500
- --------------------------------------------------------------------------------
Finance - Auto Loans - 0.9%
     500,000    General Motors Acceptance Corp., 6.625%
                  notes, due 10/15/05                                    505,625
- --------------------------------------------------------------------------------
Finance - Leasing Companies - 1.4%
     750,000    Ryder Trucks, Inc., 10.00%
                  senior subordinated notes, due 12/1/06                 751,875
- --------------------------------------------------------------------------------
Food - Diversified - 1.6%
     750,000    Ralston-Ralston Purina Group, 7.875%
                   debentures, due 6/15/25                               840,937
- --------------------------------------------------------------------------------
Food - Retail - 1.9%
     750,000    Ralphs Grocery Co., 11.00%
                  company guarantee notes, due 6/15/05                   855,000
     150,000    Star Markets Co., Inc., 13.00%
                  senior subordinated notes, due 11/1/04                 169,875
- --------------------------------------------------------------------------------
                                                                       1,024,875
- --------------------------------------------------------------------------------
Funeral Services and Related Items - 0.5%
     250,000    Service Corporation International, 7.70%
                  notes, due 4/15/09                                     272,500
- --------------------------------------------------------------------------------
Home Furnishings - 1.7%
     450,000    Cort Furniture Rental, 12.00%
                  senior notes, due 9/1/00                               496,125
     390,000    Lifestyle Furnishings International, Inc., 10.875%
                  company guaranteed notes, due 8/1/06                   433,875
- --------------------------------------------------------------------------------
                                                                         930,000
- --------------------------------------------------------------------------------
Industrial Audio and Video Products - 0.2%
     100,000    Unifrax Investment Corp., 10.50%
                  senior notes, due 11/1/03                              103,250
- --------------------------------------------------------------------------------
Insurance Brokers - 0.9%
     500,000    SIG Capital Trust I, 9.50%
                  company guaranteed notes, due 8/15/27+                 507,500
- --------------------------------------------------------------------------------
Life and Health Insurance - 1.6%
     742,000    Delphi Financial Group, Inc., 8.00%
                  senior notes, due 10/1/03                              767,042
     120,000    Penncorp Financial Group, Inc., 9.25%
                  senior subordinated notes, due 12/15/03                125,400
- --------------------------------------------------------------------------------
                                                                         892,442
- --------------------------------------------------------------------------------
Medical - Drugs - 1.0%
     500,000    ICN Pharmaceuticals, Inc., 9.25%
                  senior notes, due 8/15/05                              530,000
- --------------------------------------------------------------------------------
Medical - Hospitals - 1.5%
     750,000    Tenet Healthcare Corp., 10.125%
                  senior subordinated notes, due 3/1/05                  817,500
- --------------------------------------------------------------------------------
Medical - Nursing Home - 0.9%
     500,000    Extendicare, Inc., 9.35%
                  senior subordinated notes, due 12/15/07+               511,250
- --------------------------------------------------------------------------------
Medical Products - 0.5%
     250,000    ALARIS Medical, Inc., 9.75%
                  company guaranteed notes, due 12/1/06+                 260,938
- --------------------------------------------------------------------------------
Money Center Banks - 1.9%
     500,000    BankAmerica Corp., 7.125%
                  subordinated notes, due 5/1/06                         520,625
     500,000    Chase Manhattan Corp., 6.75%
                  subordinated notes, due 8/15/08                        506,875
- --------------------------------------------------------------------------------
                                                                       1,027,500
- --------------------------------------------------------------------------------
Multimedia - 4.4%
  $  250,000    News America Holdings, Inc., 7.70%
                  unsecured senior debentures, due 10/30/25           $  261,250
   1,000,000    Time Warner, Inc., 8.18%
                  notes, due 8/15/07                                   1,096,250
   1,000,000    Walt Disney Co. (The), 6.75%
                  senior notes, due 3/30/06                            1,031,250
- --------------------------------------------------------------------------------
                                                                       2,388,750
- --------------------------------------------------------------------------------
Oil Companies - Exploration and Production - 1.6%
     550,000    Gothic Energy Corp., 12.25%
                  senior notes, due 9/1/04+                              577,500
     250,000    Gulf Canada Resources, Ltd., 9.25%
                  senior subordinated debentures,
                  due 1/15/04                                            263,125
- --------------------------------------------------------------------------------
                                                                         840,625
- --------------------------------------------------------------------------------
Oil Refining and Marketing - 0.9%
     500,000    Clark R & M Holdings, Inc., 8.875% senior
                  subordinated notes, due 11/15/07+                      503,750
- --------------------------------------------------------------------------------
Paint and Related Products - 1.0%
     500,000    Sherwin-Williams Co., 6.85%
                  notes, due 2/1/07                                      520,625
- --------------------------------------------------------------------------------
Property and Casualty Insurance - 0.7%
     350,000    Orion Capital Corp., 7.25%
                  senior notes, due 7/15/05                              363,125
- --------------------------------------------------------------------------------
Radio - 1.4%
     750,000    Chancellor Media Corp., 8.125%
                  senior subordinated notes, due 12/15/07+               735,000
- --------------------------------------------------------------------------------
Reinsurance - 0.9%
         500    Veritas Capital Trust, 10.00%
                  company guaranteed notes, due 1/1/28+                  508,750
- --------------------------------------------------------------------------------
Retail - Leisure Products - 0.3%
     150,000    Selmer Co., Inc., 11.00%
                  senior subordinated notes, due 5/15/05                 165,188
- --------------------------------------------------------------------------------
Satellite Telecommunications - 0.5%
     250,000    Digital Television Services, L.L.C., 12.50%
                  company guaranteed notes, due 8/1/07                   280,000
- --------------------------------------------------------------------------------
Savings/Loan/Thrifts - 2.9%
     900,000    Anchor Bancorp, Inc., 8.9375%
                  senior notes, due 7/9/03                               934,875
     350,000    Local Financial Corp., 11.00%
                  senior notes, due 9/8/04+                              371,000
     250,000    Standard Federal Bancorp, 7.75%
                  subordinated notes, due 7/17/06                        268,750
- --------------------------------------------------------------------------------
                                                                       1,574,625
- --------------------------------------------------------------------------------
Steel - Producers - 2.5%
     750,000    Ivaco, Inc., 11.50%
                  senior notes, due 9/15/05                              808,125
     500,000    Weirton Steel Corp., 11.375%
                  senior notes, due 7/1/04                               525,000
- --------------------------------------------------------------------------------
                                                                       1,333,125
- --------------------------------------------------------------------------------
Telecommunication Services - 1.9%
     250,000    Intermedia Communications, Inc.,
                  zero coupon, senior discount notes,
                  due 5/15/06                                            197,500
     250,000    Qwest Communications International,
                  zero coupon, senior discount notes,
                  due 10/15/07+                                          169,688
     600,000    Talton Holdings, Inc., 11.00%
                  company guaranteed notes, due 6/30/07                  645,000
- --------------------------------------------------------------------------------
                                                                       1,012,188
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

            JANUS ASPEN FLEXIBLE INCOME PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Telephone - Local - 0.3%
  $  250,000    MetroNet Communications,
                  zero coupon senior discount notes,
                  due 11/1/07+                                       $   152,813
- --------------------------------------------------------------------------------
Telephone - Long Distance - 2.0%
   1,000,000    WorldCom, Inc., 7.75%
                  notes, due 4/1/07                                    1,072,500
- --------------------------------------------------------------------------------
Television - 0.5%
      50,000    Allbritton Communications, 11.50%
                  senior subordinated debentures,
                  due 8/15/04                                             52,500
      50,000    Dialog Corp. PLC, 11.00%
                  senior subordinated notes, due 11/15/07                 52,187
     150,000    Pegasus Media & Communications, Inc., 12.50%
                  notes, due 7/1/05                                      171,000
- --------------------------------------------------------------------------------
                                                                         275,687
- --------------------------------------------------------------------------------
Tobacco - 0.8%
     400,000    Consolidated Cigar Acquisition Corp., 10.50%
                  senior subordinated notes, due 3/1/03                  417,000
- --------------------------------------------------------------------------------
Transportation - Services - 0.5%
     250,000    CSX Corp., 7.25%
                  debentures, due 5/1/04                                 261,563
- --------------------------------------------------------------------------------
Wire and Cable Products - 1.0%
     500,000    Anixter International, Inc., 8.00%
                  company guaranteed notes, due 9/15/03                  527,500
- --------------------------------------------------------------------------------
Total Corporate Bonds (cost $34,238,200)                              35,619,805
- --------------------------------------------------------------------------------
Foreign Bonds - 1.0%
DEM
     900,000    ITT Promedia, 9.125%
                  senior subordinated notes, due 9/15/07**
                  (cost $507,858)                                        524,320
- --------------------------------------------------------------------------------
Preferred Stock - 0.6%
- --------------------------------------------------------------------------------
Savings/Loan/Thrifts - 0.6%
      10,000    Chevy Chase Savings, 13.00%
                  (cost $313,375)                                        305,000
- --------------------------------------------------------------------------------
U.S. Government Obligations - 20.9%
                U.S. Treasury Notes/Bonds:
$  7,250,000      6.625%, due 5/15/07                                  7,672,530
   2,500,000      6.125%, due 8/15/07                                  2,568,575
   1,000,000      6.625%, due 2/15/27                                  1,084,830
- --------------------------------------------------------------------------------
Total U.S. Government Obligations (cost $11,037,136)                  11,325,935
- --------------------------------------------------------------------------------
Warrants - 0%
       7,700    Gothic Energy Corp. - exp. 9/1/04*,+
                  (cost $0)                                               13,475
- --------------------------------------------------------------------------------
U.S. Government Agency - 9.6%
                Freddie Mac
   5,200,000      6.00%, 1/2/98 (amortized cost $5,199,133)            5,199,133
- --------------------------------------------------------------------------------
Total Investments (total cost $51,295,702) - 97.9%                    52,987,668
- --------------------------------------------------------------------------------
Cash, Receivables and Other Assets, net of Liabilities - 2.1%          1,121,050
- --------------------------------------------------------------------------------
Net Assets - 100%                                                    $54,108,718
- --------------------------------------------------------------------------------

                           Forward Currency Contracts
                           Open at December 31, 1997

Currency Sold and               Currency           Currency         Unrealized
Settlement Date               Units Sold     Value in $ U.S.        Gain/(Loss)
- --------------------------------------------------------------------------------
German Deutschemark 3/25/98      900,000         $   503,018         $   7,200
- --------------------------------------------------------------------------------
Total                                            $   503,018         $   7,200
================================================================================

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

                        JANUS ASPEN HIGH-YIELD PORTFOLIO
          Portfolio Managers, Sandy R. Rufenacht and Ronald V. Speaker

A Strong Year

Several  themes  converged to make 1997 an exciting year for  high-yield  bonds,
which  were one of the  best-performing  sectors  of the  fixed-income  markets.
Interest rates, after peaking in early April, trended lower as signs of moderate
economic growth and low inflation became clearer. The steady decline in Treasury
yields  and  growing  acceptance  of  high-yield  bonds  as  viable  alternative
investments combined to generate strong demand from investors.

At the same  time,  businesses  looked  to the  high-yield  market as a means of
financing capital improvements and acquisitions.  This led to a record amount of
new issuance: $107 billion.

Surging  stock  prices also helped to push  high-yield  bonds  higher.  Economic
conditions  that are  advantageous  to the stock  market - a favorable  business
climate,  abundant  capital and low, steady interest rates - are also beneficial
to high-yield  issuers,  and there is a strong correlation  between equities and
high-yield  bonds.  As the stock  market  forged  ahead,  so did the  high-yield
market.

Portfolio Strategy

The  high-yield  sector has attracted  record sums for more than a year now, and
certain  industries have become  overvalued.  In this scenario,  our emphasis on
stringent,  fundamental,  equity-style research is critical.  In-depth, hands-on
research  produces a better  understanding of a company's  balance sheet and the
true risks of its business. It can also can uncover earnings potential and other
factors that make a bond  attractive,  including  rating  upgrade  potential and
industry consolidation.

In the supermarket  industry,  regional  operations are being acquired by larger
chains. Our approach is to own well-run  companies posting good results.  One of
our positions,  Ralph's, traded well for some time before being acquired by Fred
Meyers in the fourth  quarter.  Because this  consolidation  was undertaken by a
bigger,  stronger company with a better balance sheet, our holdings  appreciated
substantially.

Likewise,  the  Telecommunication Act of 1996 has brought about major changes to
that  industry,  including  significant  merger  and  takeover  activity.  Local
exchange   carriers,   the  established   regional  Bell   operators,   and  the
long-distance companies are now competing head-to-head to provide local service,
giving  consumers  more choices and lower  prices.  The intense  competition  is
creating  pressure  to  consolidate.   For  the  major  national   long-distance
companies,  acquiring a local,  independent competitive access provider, or CAP,
can be the most efficient way to move into local service.

We added several  telecommunications  issues to the  Portfolio  during the year.
Among them was Teleport  Communications Group Inc., one of the better-performing
CAPs.  Teleport,  which operates  alternative  local phone networks for business
customers in more than 60 major U.S. markets, was recently acquired by AT&T.


Another    telecommunications   holding   that   performed   well   was   Nextel
Communications,   a  fully  integrated  wireless   communication  company.  This
all-in-one  (pager,  cellular  phone and two-way  radio)  nationwide  network is
heavily  backed by Craig McCaw, a visionary in the industry who has already sold
one company to AT&T.

Another  part of our  strategy was to let cash levels build from time to time so
that we could take advantage of selected  oppor-tunities,  including new issues.
Although this impacted the  Portfolio's  current yield at various  points during
the past 12 months,  it also made it  possible  for us to buy  opportunistically
during  temporary  downturns  in the market and thereby  add to the  Portfolio's
total return.

- --------------------------------------------------------------------------------
Portfolio Profile                  December 31, 1997      December 31, 1996
Weighted Average Maturity               6.8 Yrs.               8.0 Yrs.
Average Modified Duration*              4.5 Yrs.               5.1 Yrs.
30-Day Average Yield
  Institutional Shares**                 8.10%                  8.93%
    Without Reimbursement**              7.04%                  5.89%
  Retirement Shares**                    7.68%                   N/A
    Without Reimbursement**              6.60%                   N/A
Average Rating                             B+                      B
- --------------------------------------------------------------------------------
 * A theoretical measure of price volatility.
** Yields will fluctuate.

The Year Ahead

We remain optimistic about the high-yield market in general and the Portfolio in
particular.  The recent volatility in Southeast Asia has affected  economies and
markets  worldwide,  but the  underpinnings  for a sound U.S.  economy remain in
place. Economic growth continues to be moderate and inflation is in check, so we
expect  investors  to  continue  to seek out the  relatively  attractive  yields
offered by high-yield bonds. In the event that rates fall further, the Portfolio
is  well-positioned  for  appreciation.  If rates  rise,  the  effect  should be
mitigated by the upside potential of the many consolidation-candidate  issues we
own.

Research remains the key to our strategy,  and we will use our strengths in this
area to look  for  higher-yielding  bonds  that  the  market  doesn't  initially
perceive  will be  called.  Many  bonds  issued  in 1992  mature in 2002 but are
potentially  callable  today - a situation that could provide both steady income
and appreciation for our shareholders.

Thank you for your continued investment in Janus Aspen High-Yield Portfolio.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

                        JANUS ASPEN HIGH-YIELD PORTFOLIO
          Portfolio Managers, Sandy R. Rufenacht and Ronald V. Speaker

- --------------------------------------------------------------------------------
Average Annual Total Return(1)
For the Periods Ended December 31, 1997
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 5/1/96)
  1 Year                                                15.98%
  From Inception                                        17.24%
- --------------------------------------------------------------------------------
Lehman Brothers High-Yield Bond Index
  1 Year                                                12.76%
  From Inception Date
    of Institutional Shares                             13.29%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                   --
  From Inception                                        11.96%
- --------------------------------------------------------------------------------
Note: Performance of the Retirement  Shares is lower from the performance  shown
      on this graph for the  Institutional  Shares,  based upon the higher  fees
      paid by shareholders investing in this class.
- --------------------------------------------------------------------------------

Performance Overview(1)          Source - Lipper Analytical Services, Inc. 1997.

GRAPHIC

A graphic comparison of the change in value of a hypothetical $10,000 investment
in Janus  Aspen  High-Yield  Portfolio  -  Institutional  Shares  and the Lehman
Brothers High-Yield Bond Index. Janus Aspen High-Yield Portfolio - Institutional
Shares is represented by a solid black line. The Lehman Brothers High-Yield Bond
Index is  represented by a dashed black line. The "y" axis reflects the value of
the investment.  The "x" axis reflects the  computation  periods from inception,
May 1, 1996,  through  December 31, 1997. The upper right quadrant  reflects the
ending value of the hypothetical  investment in Janus Aspen High-Yield Portfolio
- - Institutional  Shares ($13,036) as compared to the Lehman Brothers  High-Yield
Bond Index ($12,311).

(1)  All returns reflect reinvested  dividends.  The Portfolio's  securities may
     differ significantly from the securities in the Index. Index returns do not
     include  taxes or  dividends  and interest  payments or operating  expenses
     necessary to maintain a portfolio  consisting of the same  securities  that
     are in the Index.  These returns do not reflect the charges and expenses of
     any particular  insurance product or qualified plan.  Investment return and
     principal value will fluctuate so that shares, when redeemed,  may be worth
     more or less than their  original cost.  The advisor  voluntarily  waives a
     portion of the Portfolio's  expenses.  Without such waiver, the Portfolio's
     total returns for each class would have been lower.  Past  performance does
     not guarantee future results.

               JANUS ASPEN HIGH-YIELD PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Corporate Bonds - 112.5%
- --------------------------------------------------------------------------------
Agricultural Operations - 3.5%
   $ 100,000    Iowa Select Farms, 10.75%
                  senior subordinated notes, due 12/1/05            $    102,500
- --------------------------------------------------------------------------------
Airlines - 3.4%
     100,000    Trans World Airlines, 11.50%
                  senior notes, due 12/15/04                             100,250
- --------------------------------------------------------------------------------
Automotive - Truck Parts and Equipment - 2.6%
      25,000    Airxcel, Inc., 11.00%
                  senior subordinated notes, due 11/15/07                 25,750
      50,000    Stanadyne Automotive Corp., 10.25%
                  senior subordinated notes, due 12/15/07                 49,875
- --------------------------------------------------------------------------------
                                                                          75,625
- --------------------------------------------------------------------------------
Building and Construction - 1.2%
      35,000    Reliant Building Products, 10.875%
                  senior subordinated notes, due 5/1/04                   36,444
- --------------------------------------------------------------------------------
Building and Construction Products - 0.9%
      25,000    Kevco, Inc., 10.375%
                  senior subordinated notes, due 12/1/07                  25,500
- --------------------------------------------------------------------------------
Building Products - Doors and Windows - 0.9%
      25,000    Desa International, Inc., 9.875%
                  senior subordinated notes, due 12/15/07                 25,625
- --------------------------------------------------------------------------------
Cable Television - 3.2%
      75,000    Adelphia Communications Corp., 9.25%
                  senior notes, due 10/1/02                               76,500
       5,000    Galaxy Telecom, L.P., 12.375%
                  senior subordinated notes, due 10/1/05                   5,500
      10,000    Rifkin Acquisition Partners, L.P., 11.125%
                  senior subordinated notes, due 1/15/06                  10,962
- --------------------------------------------------------------------------------
                                                                          92,962
- --------------------------------------------------------------------------------
Casino Hotels - 3.4%
   $ 100,000    Venetian Casino Resort, L.L.C., 12.25%
                  mortgage bonds, due 11/15/04                      $    100,250
- --------------------------------------------------------------------------------
Casino Services - 1.7%
      50,000    Isle of Capri Black Hawk, L.L.C., 13.00%
                  first mortgage bonds, due 8/31/04+                      50,562
- --------------------------------------------------------------------------------
Cellular Telecommunications - 4.5%
                Nextel Communications, Inc.:
      30,000      zero coupon, senior discount notes,
                  due 9/1/03                                              29,700
     100,000      zero coupon, senior discount notes,
                  due 8/15/04                                             89,000
      25,000    Telesystem International Wireless, Inc.,
                  zero coupon, senior discount notes,
                  due 11/1/07                                             13,844
- --------------------------------------------------------------------------------
                                                                         132,544
- --------------------------------------------------------------------------------
Circuit Boards - 0.9%
      25,000    Details, Inc., 10.00%
                  senior subordinated notes, due 11/15/05                 25,625
- --------------------------------------------------------------------------------
Commercial Banks - 0.8%
                First Nationwide Holdings, Inc.:
       5,000      12.50%, senior notes,
                  due 4/15/03                                              5,687
      15,000      10.625%, senior subordinated notes,
                  due 10/1/03                                             16,762
- --------------------------------------------------------------------------------
                                                                          22,449
- --------------------------------------------------------------------------------
Commercial Services - 2.8%
      80,000    Pantry, Inc. (The), 10.25%
                  senior subordinated notes, due 10/15/07                 81,800
- --------------------------------------------------------------------------------
Finance - Leasing Companies - 3.4%
     100,000    Ryder Trucks, Inc., 10.00%
                  senior subordinated notes, due 12/1/06                 100,250
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

               JANUS ASPEN HIGH-YIELD PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Food - Diversified - 2.9%
   $  85,000    Richmont Marketing Specialists, 10.125%
                  senior subordinated notes, due 12/15/07               $ 86,275
- --------------------------------------------------------------------------------
Food - Retail - 6.4%
      25,000    Quality Food Centers, Inc., 8.70%
                  company guaranteed notes, due 3/15/07                   27,062
                Ralphs Grocery Co.:
      80,000      11.00%, company guarantee notes,
                  due 6/15/05                                             91,200
      15,000      11.00%, senior subordinated notes,
                  due 6/15/05                                             17,100
      45,000    Star Markets Co., Inc., 13.00%
                  senior subordinated notes, due 11/1/04                  50,963
- --------------------------------------------------------------------------------
                                                                         186,325
- --------------------------------------------------------------------------------
Funeral Services and Related Items - 0.6%
      15,000    Prime Succession Acquisition Co., 10.75%
                  senior subordinated notes, due 8/15/04                  16,462
- --------------------------------------------------------------------------------
Gambling - Non-Hotel Casinos - 0.9%
      25,000    Casino America, Inc., 12.50%
                  senior notes, due 8/1/03                                27,062
- --------------------------------------------------------------------------------
Gas - Transportation - 1.7%
          45    Navigator Gas Transportation, 12.00%
                  units, due 6/30/07                                      50,625
- --------------------------------------------------------------------------------
Home Furnishings - 0.8%
      20,000    Cort Furniture Rental, 12.00%
                  senior notes, due 9/1/00                                22,050
- --------------------------------------------------------------------------------
Human Resources - 0.9%
      25,000    COMFORCE Corp., 12.00%
                  senior notes, due 12/1/07+                              25,312
- --------------------------------------------------------------------------------
Industrial Audio and Video Products - 0.4%
      10,000    Unifrax Investment Corp., 10.50%
                  senior notes, due 11/1/03                               10,325
- --------------------------------------------------------------------------------
Machine Tools and Related Products - 1.7%
      45,000    International Knife & Saw, Inc., 11.375%
                  senior subordinated notes, due 11/15/06                 48,713
- --------------------------------------------------------------------------------
Machinery - Print Trade - 1.0%
      25,000    Goss Graphic Systems, Inc., 12.00%
                  senior subordinated notes, due 10/15/06                 28,313
- --------------------------------------------------------------------------------
Manufacturing - 3.2%
      50,000    Foamex, L.P., 9.875%
                  company guaranteed notes, due 6/15/07                   50,375
      40,000    Plastic Specialties & Technologies, Inc., 11.25%
                  senior secured notes, due 12/1/03                       43,500
- --------------------------------------------------------------------------------
                                                                          93,875
- --------------------------------------------------------------------------------
Medical - Outpatient and Home Medical Care - 0.9%
      25,000    HealthCor Holdings, Inc., 11.00%
                  senior notes, due 12/1/04                               25,688
- --------------------------------------------------------------------------------
Mining Services - 1.8%
      50,000    AEI Holding Co., Inc., 10.00%
                  senior notes, due 11/15/07                              51,250
- --------------------------------------------------------------------------------
Networking Products - 3.5%
         100    Concentric Network Corp., 12.75%
                  units, due 12/15/07                                    102,750
- --------------------------------------------------------------------------------
Oil and Gas Drilling - 2.5%
      75,000    Southwest Royalties, Inc., 10.50%
                  company guaranteed notes, due 10/15/04                  74,063
- --------------------------------------------------------------------------------
Oil Companies - Exploration and Production - 1.8%
      50,000    Gothic Energy Corp., 12.25%
                  senior notes, due 9/1/04+                               52,500
- --------------------------------------------------------------------------------
Paper and Related Products - 0.9%
      25,000    Bear Island, L.L.C./Finance, 10.00%
                  senior notes, due 12/1/07                               25,313
- --------------------------------------------------------------------------------
Publishing - Books - 0.9%
    $ 25,000    Transwestern Publishing Co., 9.625%
                  senior subordinated notes, due 11/15/07              $  25,813
- --------------------------------------------------------------------------------
Recreational Centers - 0.6%
      15,000    Cobblestone Golf Group, Inc., 11.50%
                  senior notes, due 6/1/03                                16,312
- --------------------------------------------------------------------------------
Reinsurance - 0.5%
      15,000    Veritas Holdings GMBH, 9.625%
                  senior notes, due 12/15/03                              16,050
- --------------------------------------------------------------------------------
Retail - Appliances - 0.9%
      25,000    Holmes Products Corp., 9.875%
                  senior subordinated notes, due 11/15/07                 25,500
- --------------------------------------------------------------------------------
Retail - Diversified - 0.6%
      15,000    Eye Care Centers of America, Inc., 12.00%
                  senior notes, due 10/1/03                               16,275
- --------------------------------------------------------------------------------
Retail - Drug Store - 3.5%
     100,000    Community Distributors, 10.25%
                  senior notes, due 10/15/04                             102,500
- --------------------------------------------------------------------------------
Retail - Restaurants - 1.7%
      50,000    Perkins Family Restaurants, L.P., 10.125%
                  senior notes, due 12/15/07+                             50,625
- --------------------------------------------------------------------------------
Satellite Telecommunications - 0.6%
      15,000    Digital Television Services, L.L.C., 12.50%
                  company guaranteed notes, due 8/1/07                    16,800
- --------------------------------------------------------------------------------
Savings/Loan/Thrifts - 2.7%
      75,000    Local Financial Corp., 11.00%
                  senior notes, due 9/8/04+                               79,500
- --------------------------------------------------------------------------------
Steel - Producers - 2.3%
      25,000    Ivaco, Inc., 11.50%
                  senior notes, due 9/15/05                               26,938
      25,000    Sheffield Steel Corp., 11.50%
                  first mortgage bonds, due 12/1/05                       25,312
      15,000    Weirton Steel Corp., 11.375%
                  senior notes, due 7/1/04                                15,750
- --------------------------------------------------------------------------------
                                                                          68,000
- --------------------------------------------------------------------------------
Telecommunication Equipment - 1.4%
      35,000    Diamond Cable Communications PLC, zero coupon,
                  senior discount notes, due 12/15/05                     27,256
      15,000    Telex Communications, Inc., 10.50%
                  company guaranteed notes, due 5/1/07                    14,775
- --------------------------------------------------------------------------------
                                                                          42,031
- --------------------------------------------------------------------------------
Telecommunication Services - 10.6%
      25,000    FWT, Inc., 9.875%
                  senior subordinated notes, due 11/15/07                 25,625
      60,000    HighwayMaster Communications, Inc., 13.75%
                  senior notes, due 9/15/05+                              61,050
                Intermedia Communications, Inc.:
      25,000      zero coupon, senior discount notes,
                  due 5/15/06                                             19,750
      30,000      zero coupon, senior discount notes,
                  due 7/15/07                                             21,338
      40,000    Microcell Telecommunications, Inc.,
                  zero coupon, senior discount notes,
                  due 6/1/06                                              26,950
      10,000    Peoples Telephone Co., Inc., 12.25%
                  senior notes, due 7/15/02                               10,600
     125,000    RCN Corp., zero coupon
                  senior discount notes, due 10/15/07                     78,594
      80,000    Teleport Communications Group, Inc.,
                  zero coupon, senior discount notes, due 7/1/07          65,600
- --------------------------------------------------------------------------------
                                                                         309,507
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

               JANUS ASPEN HIGH-YIELD PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Telephone - Integrated - 2.4%
    $ 50,000    Esprit Telecom Group PLC, 11.50%
                  senior notes, due 12/15/07                          $   51,375
          20    MGC Communications, Inc., 13.00%
                  units, due 10/1/04+                                     20,100
- --------------------------------------------------------------------------------
                                                                          71,475
- --------------------------------------------------------------------------------
Telephone - Local - 2.1%
      50,000    American Communications Services, Inc., zero
                  coupon, senior discount notes, due 4/1/06               38,688
      25,000    Transtel S.A., 12.50%
                  senior notes, due 11/1/07+                              23,437
- --------------------------------------------------------------------------------
                                                                          62,125
- --------------------------------------------------------------------------------
Telephone - Long Distance - 1.8%
      50,000    Primus Telecommunications Group, Inc., 11.75%
                  senior notes, due 8/1/04                                53,375
- --------------------------------------------------------------------------------
Television - 5.8%
      20,000    Allbritton Communications, 11.50%
                  senior subordinated debentures,
                  due 8/15/04                                             21,000
      50,000    Dialog Corp. PLC, 11.00%
                  senior subordinated notes, due 11/15/07                 52,187
      10,000    Price Communications Wireless, Inc., 11.75%
                  senior subordinated notes, due 7/15/07                  10,825
      90,000    Radio One, Inc., 7.00%
                  senior subordinated notes, due 5/15/04                  86,963
- --------------------------------------------------------------------------------
                                                                         170,975
- --------------------------------------------------------------------------------
Textile - Products - 0.9%
      25,000    Glenoit Corp., 11.00%
                  senior subordinated notes, due 4/15/07+                 26,875
- --------------------------------------------------------------------------------
Tobacco - 0.4%
      10,000    Consolidated Cigar Acquisition Corp., 10.50%
                  senior subordinated notes, due 3/1/03                   10,425
- --------------------------------------------------------------------------------
Transportation - Marine - 2.5%
      75,000    Panoceanic Bulk Carriers, Ltd., 12.00%
                  notes, due 12/15/07                                     74,437
- --------------------------------------------------------------------------------
Transportation - Services - 1.1%
      30,000    Atlantic Express, Inc., 10.75%
                  company guaranteed notes, due 2/1/04                    31,800
- --------------------------------------------------------------------------------
Trucking and Leasing - 0.7%
      20,000    Core-Mark International, Inc., 11.375%
                  senior subordinated notes, due 9/15/03                  21,150
- --------------------------------------------------------------------------------
Water - 2.6%
      75,000    Sparkling Spring Water Group, 11.50%
                  senior subordinated notes, due 11/15/07                 77,063
- --------------------------------------------------------------------------------
Wire and Cable Products - 0.8%
      20,000    International Wire Group, 11.75%
                  senior subordinated notes, due 6/1/05                   21,950
- --------------------------------------------------------------------------------
Total Corporate Bonds (cost $3,231,980)                                3,289,850
- --------------------------------------------------------------------------------
Foreign Bonds - 2.0%
DEM
     100,000    ITT Promedia, 9.125%
                  senior subordinated notes, due 9/15/07
                  (cost $56,429)                                      $   58,257
- --------------------------------------------------------------------------------
Preferred Stock - 0.7%
- --------------------------------------------------------------------------------
Savings/Loan/Thrifts - 0.6%
         600    Chevy Chase Savings, 13.00%                               18,300
- --------------------------------------------------------------------------------
Telecommunication Services - 0.1%
           1    Intermedia Communications Inc., 13.50%                     1,513
- --------------------------------------------------------------------------------
Total Preferred Stock (cost $18,600)                                      19,813
- --------------------------------------------------------------------------------
Warrants - 0.2%
         700    Gothic Energy Corp. - exp. 9/1/04*                         1,225
         160    Microcell Telecommunications, Inc.,
                  Initial - exp. 6/1/06*,+                                 3,760
          50    Primus Telecommunications Group, Inc.
                  - exp. 8/1/04*                                             500
- --------------------------------------------------------------------------------
Total Warrants (cost $2,100)                                               5,485
- --------------------------------------------------------------------------------
U.S. Government Agency - 5.6%
                Freddie Mac
    $165,000      6.00%, 1/2/98 (amortized cost $164,973)                164,973
- --------------------------------------------------------------------------------
Total Investments (total cost $3,474,082) - 121.0%                     3,538,378
- --------------------------------------------------------------------------------
Liabilities, net of Cash, Receivables and Other Assets - (21.0%)       (613,461)
- --------------------------------------------------------------------------------
Net Assets - 100%                                                     $2,924,917
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

  JANUS ASPEN SHORT-TERM BOND PORTFOLIO Portfolio Manager, Sandy R. Rufenacht

The Year in Review

Key  to  the   Portfolio's   performance  was  its  flexibility  in  a  changing
interest-rate  environment.  Fearing  that  higher  wages  and a  rapid  rate of
economic  growth would  accelerate  inflation  and cause the Federal  Reserve to
boost  short-term  interest  rates,  investors bid down the price of securities,
thereby  forcing  yields  higher  and  flattening  out the  yield  curve  (i.e.,
narrowing the  difference in yields  between  short- and long-term  securities).
Yields on the  three-year  Treasury note began 1997 at 6.07% and moved up during
the first four months to roughly  6.50%.  Through  much of the year,  short-term
securities  traded in this  relatively  narrow range but exhibited  considerable
day-to-day volatility.

Though the economy remained robust,  inflation did not increase (largely because
of productivity  gains that held down costs),  and by late in the third quarter,
the bond market  began a rally that was later  bolstered  by the Asian  monetary
crisis.  As problems in the economies of several Southeast Asian "tigers" spread
to markets  worldwide,  there was a flight to quality  issues,  especially  U.S.
Treasury  securities.  The sudden  increase  in demand  helped to push prices of
these  securities  up (and yields  down) to levels not seen since the 1960s.  At
year-end the yield on the three-year Treasury bond stood at 5.67%.

Portfolio Strategy

Our  diversified,  flexible  approach,  which stresses  maximizing  yields while
controlling risk, allowed us to be very responsive to the market during the past
12 months.

The majority of the  Portfolio,  as the table below  indicates,  was invested in
investment-grade corporate securities, which have limited credit risk. Among the
latter were such well-known names as SmithKline  Beecham,  Sherwin-Williams  and
Chrysler Financial Corp.

- --------------------------------------------------------------------------------
Portfolio Asset Mix                December 31, 1997     December 31, 1996
Investment-Grade Corp. Bonds             82.5%                  56.4%
U.S. Government Obligations                --                   42.0%
Cash & Cash Equivalents                  17.5%                   1.6%
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
Portfolio Profile                  December 31, 1997     December 31, 1996
Weighted Average Maturity               1.9 Yrs.               2.0 Yrs.
Average Modified Duration*              1.6 Yrs.               1.8 Yrs.
30-day Average Yield
  Institutional Shares**                 6.15%                  5.37%
    Without Reimbursement**              4.94%                  4.99%
  Retirement Shares**                    5.57%                   N/A
    Without Reimbursement**              4.36%                   N/A
Average Rating                             A+                     AA
- --------------------------------------------------------------------------------
 * A theoretical measure of price volatility.
** Yields will fluctuate.

The most  significant  change  in  portfolio  composition  was the  addition  of
short-term, high-yield securities. Maintaining high cash levels at various times
during the year permitted us to buy these bonds advantageously during short-term
fluctuations with-out incurring much incremental risk. Although these high-yield
bonds   generally   involve  greater  credit  risk  than  that  associated  with
investment-grade  bonds,  their  higher  coupons and  relatively  short terms to
maturity provide more attractive yields,  lower  interest-rate risk, and shorten
the Portfolio's duration. By focusing on short-term issues trading to their call
prices,  we collected  higher-paying  coupons  with a relatively  high degree of
safety.  (When a bond has only a few years  left and is  trading  at or near its
call price, there is less chance that the price will fall below that level.)

One highlight in this area was All American  Communications,  which was acquired
by Pearson PLC and tendered at more than six points  above our  purchase  price.
Prior to the redemption, the Portfolio benefited from its 10.88% coupon.

Key  to  our  ability  to  identify   high-yield   issues  is  Janus'  extensive
equity-research  capability.  Drawing upon the wealth of data  gathered  through
hands-on review of the  fundamentals of hundreds of companies  annually helps us
to better  assess credit  quality and identify the true risks of the  underlying
business.   This  reasearch  can  also  reveal  earnings   potential  and  other
characteristics of the company that make a bond a good buy.

Going Forward

Because of the increased diversification in the Portfolio, it did not benefit as
much as it might have from the rally in Treasury  securities during November and
December.  Nonetheless,  we believe  that  broadening  our  holdings  will serve
shareholders well in the coming months.

The recent volatility in Southeast Asia may take some time yet to rectify and is
likely to keep  economic  growth  and  inflation  in the U.S.  at very  moderate
levels.  While the jury is still out, it is possible that short-term rates could
decline further - an event that would make the high coupons on our holdings even
more  valuable.  If rates rise,  the Portfolio is positioned to respond  quickly
while maintaining a stable net asset value.

Thank  you  for  your  continued  investment  in  Janus  Aspen  Short-Term  Bond
Portfolio.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

  JANUS ASPEN SHORT-TERM BOND PORTFOLIO Portfolio Manager, Sandy R. Rufenacht

- --------------------------------------------------------------------------------
Average Annual Total Return(1)
For the Periods Ended December 31, 1997
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 9/13/93)
  1 Year                                                 6.72%
  From Inception                                         4.95%
- --------------------------------------------------------------------------------
Lehman Brothers Govt./Corp. 1-3 Year Bond Index
  1 Year                                                 6.66%
  From Inception Date
    of Institutional Shares                              5.60%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                   --
  From Inception                                         4.53%
- --------------------------------------------------------------------------------
Note: Performance of the Retirement  Shares is lower from the performance  shown
      on this graph for the  Institutional  Shares,  based upon the higher  fees
      paid by shareholders investing in this class.
- --------------------------------------------------------------------------------

Performance Overview(1)          Source - Lipper Analytical Services, Inc. 1997.

GRAPHIC

A graphic comparison of the change in value of a hypothetical $10,000 investment
in Janus Aspen  Short-Term Bond Portfolio - Institutional  Shares and the Lehman
Brothers  Government/Corporate  1-3 Year Bond Index. Janus Aspen Short-Term Bond
Portfolio -  Institutional  Shares is  represented  by a solid  black line.  The
Lehman  Brothers  Government/Corporate  1-3 Year Bond Index is  represented by a
dashed black line.  The "y" axis reflects the value of the  investment.  The "x"
axis reflects the computation periods from inception, September 13, 1993 through
December 31,  1997.  The upper right  quadrant  reflects the ending value of the
hypothetical investment in Janus Aspen Short-Term Bond Portfolio - Institutional
Shares  ($12,304) as compared to the Lehman  Brothers  Government/Corporate  1-3
Year Bond Index ($12,637).

(1)  All returns reflect reinvested  dividends.  The Portfolio's  securities may
     differ significantly from the securities in the Index. Index returns do not
     include  taxes or  dividends  and interest  payments or operating  expenses
     necessary to maintain a portfolio  consisting of the same  securities  that
     are in the Index.  These returns do not reflect the charges and expenses of
     any particular  insurance product or qualified plan.  Investment return and
     principal value will fluctuate so that shares, when redeemed,  may be worth
     more or less than their  original cost.  The advisor  voluntarily  waives a
     portion of the Portfolio's  expenses.  Without such waiver, the Portfolio's
     total returns for each class would have been lower.  Past  performance does
     not guarantee future results.

            JANUS ASPEN SHORT-TERM BOND PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Corporate Bonds - 82.5%
- --------------------------------------------------------------------------------
Aerospace and Defense - 5.5%
    $150,000    Lockheed Martin Corp., 6.55%
                  company guaranteed unsecured notes,
                  due 5/15/99                                         $  150,750
- --------------------------------------------------------------------------------
Commercial Banks - 5.4%
     150,000    First USA Bank, Inc., 5.75%
                  notes, due 1/15/99                                     149,625
- --------------------------------------------------------------------------------
Computers - Mainframe - 5.5%
     150,000    IBM Corp., 6.375%
                  global notes, due 6/15/00                              151,125
- --------------------------------------------------------------------------------
Diversified Financial Services - 11.0%
     150,000    Associates Corp. of North America, 6.375%
                  senior notes, due 8/15/98                              150,396
     150,000    Chrysler Financial Corp., 6.625%
                  notes, due 8/15/00                                     151,875
- --------------------------------------------------------------------------------
                                                                         302,271
- --------------------------------------------------------------------------------
Finance - Leasing Companies - 10.9%
     150,000    International Lease Finance Corp., 6.125%
                  notes, due 11/1/99                                     150,000
     150,000    Pitney Bowes Credit Corp., 6.25%
                  notes, due 6/1/98                                      150,262
- --------------------------------------------------------------------------------
                                                                         300,262
- --------------------------------------------------------------------------------
Food - Diversified - 5.5%
     150,000    Grand Metropolitan Investment Corp., 6.50%
                  company guaranteed notes, due 9/15/99                  150,937
- --------------------------------------------------------------------------------
Hotels and Motels - 5.5%
     150,000    Hyatt Equities, L.L.C., 6.80%
                  notes, due 5/15/00+                                    151,688
- --------------------------------------------------------------------------------
Medical - Drugs - 5.6%
  $  150,000    SmithKline Beecham PLC, 6.75%
                  company guaranteed notes, due 10/30/01              $  153,188
- --------------------------------------------------------------------------------
Oil Companies - Integrated - 5.5%
     150,000    Texaco Capital, Inc., 6.875%
                  notes, due 7/15/99                                     152,063
- --------------------------------------------------------------------------------
Paint and Related Products - 5.5%
     150,000    Sherwin-Williams Co., 6.25%
                  notes, due 2/1/00                                      150,563
- --------------------------------------------------------------------------------
Pipelines - 5.5%
     150,000    Enron Corp., 6.45%
                  notes, due 11/15/01                                    150,562
- --------------------------------------------------------------------------------
Retail - Discount - 11.1%
     150,000    TJX Companies, Inc., 6.625%
                  notes, due 6/15/00                                     151,125
     150,000    Woolworth Corp., 7.00%
                  notes, due 6/1/00                                      152,250
- --------------------------------------------------------------------------------
                                                                         303,375
- --------------------------------------------------------------------------------
Total Corporate Bonds (cost $2,252,934)                                2,266,409
- --------------------------------------------------------------------------------
U.S. Government Agency - 16.4%
                Freddie Mac
     449,000      6.00%, 1/2/98 (amortized cost $448,925)                448,925
- --------------------------------------------------------------------------------
Total Investments (total cost $2,701,859) - 98.9%                      2,715,334
- --------------------------------------------------------------------------------
Cash, Receivables and Other Assets, net of Liabilities - 1.1%             29,860
- --------------------------------------------------------------------------------
Net Assets - 100%                                                     $2,745,194
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

    JANUS ASPEN MONEY MARKET PORTFOLIO Portfolio Manager, Sharon S. Pichler

Performance Review

For year ended  1997,  Janus Aspen Money  Market  Portfolio  produced a one year
average annual total return of 5.17% and an average annual total return of 5.21%
since  inception for the  Institutional  class.  For the  Retirement  Shares the
cumulative  total return since  inception of May 1, 1997,  was 3.13%.  The 7-day
current yield was 5.32% and 4.82% for the  Institutional  and Retirement  Shares
respectively.

The Economic Perspective

Early in 1997, in anticipation of higher  inflation,  short-term  interest rates
rose from the lows of 1996, moving closer to intermediate-term rates and thereby
flattening the yield curve. For most of the year,  short-term interest rates, as
measured by the yield on one-year  Treasury  securities,  stayed in a relatively
narrow range between  approximately  5.5% and 6.0%.  Less  sensitive to economic
conditions  than  longer-term  securities,  short-term  issues  instead react to
changes  in the  federal  funds  rate,  which  changed  only once (by  0.25%) in
mid-March.

Expectations  changed late in the year, after  fourth-quarter  volatility in the
foreign capital markets ignited a "flight to quality." Demand for U.S.  Treasury
securities,  which are  considered  among the  world's  safest,  highest-quality
investments,  rose  significantly in November and December,  resulting in higher
prices and lower yields in the  short-term  market.  At  year-end,  the yield on
one-year  Treasuries  had moved down to 5.48%,  and by January 9, 1998, was down
even more dramatically to 5.08%.

In addition, as the year wound down, earlier worries about inflated stock prices
and higher  inflation,  which would normally cause the Federal  Reserve Board to
raise rates,  shifted to  consideration  of deflation.  Federal Reserve Chairman
Alan  Greenspan  discussed the  possibility  that the monetary and market crises
that began in Thailand might cause the world economy to slow down significantly.
Overcapacity in Southeast Asia increases the likelihood that prices of many U.S.
imports  will  move not  higher  but  lower.  This in turn  should  help to keep
inflation in the United  States in check,  despite our robust  economy and tight
labor market.

Given this scenario, we believe the next move in the federal funds rate could be
a reduction, perhaps as early as late March.

Portfolio Strategy

For  much of the  year,  assets  were  invested  primarily  in  very  short-term
obligations  (e.g.,  1-7 days),  which were  providing  yields close to those of
longer-term  debt (e.g.,  six months to one year).  I did not lock the Portfolio
into longer obligations unless I felt we could be adequately compensated for the
extra time exposure. At year-end,  the Portfolio's weighted average maturity was
just 10 days.

As events in the global economy unfold, I may extend the Portfolio's maturity by
selectively  purchasing six-month and one-year issues. In the event of a further
decline  in  rates,  this  will  help us to  capture  a bit more  upside,  since
longer-term debt gains more value when rates fall. Liquidity  considerations are
paramount,  and we will be careful to maintain at least a 50%  weighting  in the
shortest-term  issues.  All issues involve very minimal  credit risk  (generally
those rated in the top two tiers by the major  national  rating  organizations).
This will help to ensure that the Portfolio  serves its purpose as a good choice
for the cash portion of your investments.

Thank you for your continued investment in Janus Aspen Money Market Portfolio.

- --------------------------------------------------------------------------------
A  money  market  portfolio  is  neither  insured  nor  guaranteed  by the  U.S.
government,  and there can be no  assurance  it will be able to maintain a $1.00
share  price.  The  adviser  voluntarily  waives a  portion  of the  Portfolio's
expenses.  Without such waiver,  the  Portfolio's  total  returns for each class
would have been lower.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

              JANUS ASPEN MONEY MARKET PORTFOLIO December 31, 1997
- --------------------------------------------------------------------------------
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
U.S. Government Agencies - 58.4%
  $2,500,000    Fannie Mae
                  5.70%, 1/5/98                                     $  2,498,417
   2,000,000    Federal Farm Credit Bank
                  5.75%, 1/16/98                                       1,995,208
                Freddie Mac:
   2,500,000      5.70%, 1/9/98                                        2,496,833
   2,000,000      5.67%, 1/13/98                                       1,996,220
- --------------------------------------------------------------------------------
Total U.S. Government Agencies (amortized cost $8,986,678)             8,986,678
- --------------------------------------------------------------------------------
Short-Term Corporate Notes - 20.4%
     750,000    Bell Atlantic Network    
                  5.90%, 1/22/98                                         747,419
     500,000    CIT Holdings
                  5.81%, 1/15/98                                         498,870
     500,000    General Electric Capital Corp.
                  5.85%, 1/8/98                                          499,431
     500,000    Household Finance Corp.
                  5.92%, 1/6/98                                          499,589
     400,000    IBM Credit Corp.
                  5.50%, 1/16/98                                         399,083
     500,000    Prudential Funding Corp.
                  5.88%, 1/12/98                                         499,102
- --------------------------------------------------------------------------------
Total Short-Term Corporate Notes (amortized cost $3,143,494)           3,143,494
- --------------------------------------------------------------------------------
Repurchase Agreement - 15.3%
 $ 2,350,000    Goldman  Sachs, Inc., 6.25% dated 12/31/97,
                  maturing 1/2/98, to be repurchased at $2,350,816
                  collateralized by $2,342,000 in Fannie Mae,
                  6.50%,  2/25/02 with value of $2,397,093 (cost
                  $2,350,000)***                                     $ 2,350,000
- --------------------------------------------------------------------------------
Total Investments (total cost $14,480,172) - 94.1%                    14,480,172
- --------------------------------------------------------------------------------
Cash, Receivables and Other Assets, net of Liabilities  - 5.9%           903,480
- --------------------------------------------------------------------------------
Net Assets - 100%                                                    $15,383,652
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

                       NOTES TO SCHEDULES OF INVESTMENTS

(ADR) - American Depository Receipt
(GDR) - Global Depository Receipt
DEM - German Deutschemark
JPY - Japanese Yen

  * Non-income-producing security
 ** A portion of this  security has been  segregated  by the  custodian to cover
    segregation requirements on forward currency contracts.
*** Repurchase  Agreements  held by the Portfolio are fully  collateralized  and
    such  collateral is in the  possession  of the  Portfolio's  custodian.  The
    collateral  is evaluated  daily to ensure its market value equals or exceeds
    the current  market value of the  repurchase  agreements  including  accrued
    interest.  In the event of  default on the  obligation  to  repurchase,  the
    Portfolio has the right to liquidate the  collateral  and apply the proceeds
    in satisfaction of the obligation.  In the event of default or bankruptcy by
    the other  party to the  agreement,  realization  and /or  retention  of the
    collateral or proceeds may be subject to legal proceedings.
  + Securities  are  registered  pursuant  to Rule  144A and may be deemed to be
    restricted for resale.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

                      STATEMENTS OF ASSETS AND LIABILITIES

<TABLE>
<CAPTION>
As of December  31, 1997 (All numbers                    Janus Aspen   Janus Aspen     Janus Aspen     Janus Aspen
in thousands except Retirement Shares     Janus Aspen     Aggressive     Capital      International     Worldwide    Janus Aspen
outstanding and net asset value per          Growth         Growth     Appreciation      Growth          Growth        Balanced
share.)                                    Portfolio      Portfolio    Portfolio(1)     Portfolio       Portfolio     Portfolio
- --------------------------------------------------------------------------------------------------------------------------------
Assets:
<S>                                         <C>            <C>            <C>            <C>            <C>            <C>     
Investments at cost                         $535,511       $400,592       $6,678         $152,691       $1,364,374     $350,008
================================================================================================================================
Investments at value                        $610,072       $514,273       $6,943         $164,336       $1,562,618     $370,376
Cash                                             132            448           51              204            1,077          385
Receivables:                              
  Investments sold                             6,077          7,056           13            1,059           21,327        5,928
  Portfolio shares sold                          575            339           42               25            1,129          932
  Interest                                        --             --           --                1               --        1,807
  Dividends                                      371            145            1              135            1,449          166
Other assets                                       5              5            6               --                9           10
Foreign currency contracts                        --             --           --              447            5,951           -- 
- --------------------------------------------------------------------------------------------------------------------------------
      Total Assets                           617,232        522,266        7,056          166,207        1,593,560      379,604
- --------------------------------------------------------------------------------------------------------------------------------
Liabilities:                              
  Payables:                                 
    Investments purchased                      7,529         13,596          198            1,443           14,305       16,896
    Portfolio shares repurchased                 907            129            6            3,551            1,311           33
    Advisory fee                                 326            296            4               87              854          211
Accrued expenses                                  41             26            2               24              139           19
Foreign currency contracts                       136              8           --               --               --           24
- --------------------------------------------------------------------------------------------------------------------------------
      Total Liabilities                        8,939         14,055          210            5,105           16,609       17,183
- --------------------------------------------------------------------------------------------------------------------------------
Net Assets                                  $608,293       $508,211       $6,846         $161,102       $1,576,951     $362,421
================================================================================================================================
Net Assets - Institutional Shares           $608,281       $508,198       $6,833         $161,091       $1,576,548     $362,409
  Shares Outstanding, $.001 Par Value       
   (unlimited shares authorized)              32,921         24,727          541            8,716           67,406       20,751
Net Asset Value Per Share                   $  18.48       $  20.55       $12.62         $  18.48       $    23.39     $  17.47
================================================================================================================================
Net Assets - Retirement Shares              $     12       $     13       $   13         $     11       $      403     $     12
  Shares Outstanding, $.001 Par Value       
   (unlimited shares authorized)                 635            620        1,000              599           17,251          669
Net Asset Value Per Share                   $  18.46       $  20.49       $12.62         $  18.44       $    23.36     $  17.47
- --------------------------------------------------------------------------------------------------------------------------------
</TABLE>

                STATEMENTS OF ASSETS AND LIABILITIES (Continued)
<TABLE>
<CAPTION>
As of December 31, 1997 (All numbers                     Janus Aspen                   Janus Aspen
in thousands except Retirement Shares      Janus Aspen    Flexible     Janus Aspen      Short-Term     Janus Aspen
outstanding and net asset value per       Equity Income    Income       High-Yield        Bond         Money Market  
share.)                                    Portfolio(1)   Portfolio     Portfolio       Portfolio        Portfolio     
- --------------------------------------------------------------------------------------------------------------------------------
Assets:
<S>                                         <C>            <C>            <C>            <C>            <C>       
Investments at cost                         $  2,947       $ 51,296       $3,474         $  2,702       $   14,480
================================================================================================================================
Investments at value                        $  3,027       $ 52,988       $3,538         $  2,715       $   14,480
Cash                                              49            104            2                1                2
Receivables:                                
  Investments sold                                11             --           --               --               -- 
  Portfolio shares sold                           58            168           --               --            1,084
  Interest                                         3            900           54               35               -- 
  Dividends                                        2             --           --               --               -- 
Other assets                                      25             --            5                3               -- 
Foreign currency contracts                        --              7           --               --               -- 
- --------------------------------------------------------------------------------------------------------------------------------
      Total Assets                             3,175         54,167        3,599            2,754           15,566
- --------------------------------------------------------------------------------------------------------------------------------
Liabilities:                                
  Payables:                                 
    Investments purchased                        107             --           --               --               -- 
    Portfolio shares repurchased                  --             23          660                1              171
    Advisory fee                                   2             28            2                2                4
Accrued expenses                                   6              7           12                6                7
Foreign currency contracts                        --             --           --               --               -- 
- --------------------------------------------------------------------------------------------------------------------------------
      Total Liabilities                          115             58          674                9              182
- --------------------------------------------------------------------------------------------------------------------------------
Net Assets                                  $  3,060       $ 54,109       $2,925         $  2,745       $   15,384
================================================================================================================================
Net Assets - Institutional Shares           $  3,047       $ 54,098       $2,914         $  2,735       $   15,374
  Shares Outstanding, $.001 Par Value       
   (unlimited shares authorized)                 226          4,593          247              308           15,374
Net Asset Value Per Share                   $  13.46       $  11.78       $11.78         $   8.88       $     1.00
================================================================================================================================
Net Assets - Retirement Shares              $     13       $     11       $   11         $     10       $       10
  Shares Outstanding, $.001 Par Value       
   (unlimited shares authorized)               1,000            932          950            1,177           10,306
Net Asset Value Per Share                   $  13.42       $  11.77       $11.78         $   8.88       $     1.00
- --------------------------------------------------------------------------------------------------------------------------------
</TABLE>

                            STATEMENTS OF OPERATIONS
<TABLE>
<CAPTION>
                                                        Janus Aspen   Janus Aspen     Janus Aspen     Janus Aspen
For the fiscal year or period ended      Janus Aspen     Aggressive     Capital      International     Worldwide    Janus Aspen
December 31, 1997 (All numbers in           Growth         Growth     Appreciation      Growth          Growth        Balanced
thousands.)                               Portfolio      Portfolio    Portfolio(1)     Portfolio       Portfolio     Portfolio
- --------------------------------------------------------------------------------------------------------------------------------
<S>                                       <C>            <C>             <C>           <C>             <C>            <C>     
Investment Income:                        
  Interest                                $  3,410       $  1,476        $  44         $    651        $   3,973      $  4,762 
  Dividends                                  4,438          1,316            4            1,070           13,770         1,808 
  Foreign Tax Withheld                        (179)           (61)          --             (130)          (1,493)          (57)
- --------------------------------------------------------------------------------------------------------------------------------
Total Investment Income                      7,669          2,731           48            1,591           16,250         6,513
- --------------------------------------------------------------------------------------------------------------------------------
Expenses:
  Advisory fees                              3,120          3,036           13              645            7,533         1,348 
  Transfer agent fees and expenses               6              6           --                1               14             2 
  Registration fees                              4              4            1               --               17             5 
  System fees                                   17             11            5               10               14            12
  Custodian fees                               161            101            9              255              905            80
  Insurance expense                              2              3           --               --               10             1
  Audit fees                                    14             13            2                8               20             8
  Other expenses                                 4              6            2                4                8             1
- --------------------------------------------------------------------------------------------------------------------------------
Total Expenses                               3,328          3,180           32              923            8,521         1,457
- --------------------------------------------------------------------------------------------------------------------------------
Less: Expense offset                            (9)           (13)          --               (1)             (15)           (5)
- --------------------------------------------------------------------------------------------------------------------------------
Net expenses                                 3,319          3,167           32              922            8,506         1,452
- --------------------------------------------------------------------------------------------------------------------------------
Less: Excess expense reimbursement              --             --           (9)              --               --            -- 
- --------------------------------------------------------------------------------------------------------------------------------
Net expenses after reimbursement             3,319          3,167           23              922            8,506         1,452
- --------------------------------------------------------------------------------------------------------------------------------
Net investment income/(loss)                 4,350           (436)          25              669            7,744         5,061
- --------------------------------------------------------------------------------------------------------------------------------
Net Realized and Unrealized                                                                          
 Gain/(Loss) on Investments:                                                                          
  Net realized gain/(loss)                                                                             
   from securities transactions             47,912          1,976         (146)            (453)          37,500        13,514
  Net realized gain/(loss)                                                                             
   from foreign currency transactions           27         (1,188)          --              323            9,650          (194)
  Net realized gain/(loss)                                                                             
   from futures contracts                       --             --           --              (18)            (316)           -- 
  Change in net unrealized appreciation                                                                
   or depreciation of investments           39,125         56,805          265           10,109          135,768        15,763
- --------------------------------------------------------------------------------------------------------------------------------
Net gain on investments                     87,064         57,593          119            9,961          182,602        29,083
- --------------------------------------------------------------------------------------------------------------------------------
Net increase in net assets                                                                           
 resulting from operations                $ 91,414       $ 57,157        $ 144         $ 10,630        $ 190,346      $ 34,144
================================================================================================================================
</TABLE>

                      STATEMENTS OF OPERATIONS (Continued)
<TABLE>
<CAPTION>
                                                        Janus Aspen                   Janus Aspen
For the fiscal year or period ended       Janus Aspen    Flexible     Janus Aspen     Short-Term      Janus Aspen  
December 31, 1997 (All numbers in        Equity Income    Income       High-Yield        Bond         Money Market 
thousands.)                               Portfolio(1)   Portfolio     Portfolio       Portfolio        Portfolio  
- --------------------------------------------------------------------------------------------------------------------------------
<S>                                       <C>            <C>             <C>           <C>             <C>      
Investment Income:                        
  Interest                                $      5       $  2,744        $ 139         $    805        $     506 
  Dividends                                      7             52            2               --               -- 
  Foreign Tax Withheld                          --             --           --               --               -- 
- --------------------------------------------------------------------------------------------------------------------------------
Total Investment Income                         12          2,796          141              805              506
- --------------------------------------------------------------------------------------------------------------------------------
Expenses:                                       
  Advisory fees                                  6            238           12               81               22 
  Transfer agent fees and expenses              --             --           --               --               -- 
  Registration fees                              1             --           --                1               --
  System fees                                    4              9           10               10               10
  Custodian fees                                28             17           18               13                7
  Insurance expense                             --             --           --               --               -- 
  Audit fees                                     3              9           10                8                6
  Other expenses                                 1              3            2               --                2
- --------------------------------------------------------------------------------------------------------------------------------
Total Expenses                                  43            276           52              113               47
- --------------------------------------------------------------------------------------------------------------------------------
Less: Expense offset                            --             (2)          --               --               -- 
- --------------------------------------------------------------------------------------------------------------------------------
Net expenses                                    43            274           52              113               47
- --------------------------------------------------------------------------------------------------------------------------------
Less: Excess expense reimbursement             (34)            --          (36)             (32)              (2)
- --------------------------------------------------------------------------------------------------------------------------------
Net expenses after reimbursement                 9            274           16               81               45
- --------------------------------------------------------------------------------------------------------------------------------
Net investment income/(loss)                     3          2,522          125              724              461
- --------------------------------------------------------------------------------------------------------------------------------
Net Realized and Unrealized                                                                           
 Gain/(Loss) on Investments:                                                                           
  Net realized gain/(loss)                                                                            
   from securities transactions                 75            690           66               48               -- 
  Net realized gain/(loss)                                                                            
   from foreign currency transactions           (4)            11            1               --               -- 
  Net realized gain/(loss)                                                                            
   from futures contracts                       --            (18)          --               --               -- 
  Change in net unrealized appreciation                                                               
   or depreciation of investments               80          1,050           39               18               -- 
- --------------------------------------------------------------------------------------------------------------------------------
Net gain on investments                        151          1,733          106               66               -- 
- --------------------------------------------------------------------------------------------------------------------------------
Net increase in net assets                                                                            
 resulting from operations                $    154       $  4,255        $ 231         $    790        $     461
================================================================================================================================
</TABLE>
(1) For the period May 1, 1997 (inception) to December 31, 1997.

See Notes to Financial Statements.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

                      STATEMENTS OF CHANGES IN NET ASSETS
<TABLE>
<CAPTION>
                                                                                                Janus Aspen      Janus Aspen
                                                     Janus Aspen             Janus Aspen          Capital       International
For the fiscal year or period ended                     Growth            Aggressive Growth    Appreciation        Growth
December 31 (all numbers in thousands(3))             Portfolio               Portfolio          Portfolio        Portfolio
- ----------------------------------------------------------------------------------------------------------------------------------
                                                     1997        1996        1997        1996      1997(1)       1997       1996
- ----------------------------------------------------------------------------------------------------------------------------------
Operations:
<S>                                             <C>         <C>         <C>         <C>         <C>         <C>         <C>     
Net investment income/(loss)                    $   4,350   $   2,996   $    (436)  $    (789)  $      25   $     669   $     46
Net realized gain/(loss) from
 investment transactions                           47,939      10,156         788     (12,093)       (146)       (148)       261
Change in unrealized net appreciation
 or (depreciation) of investments                  39,125      20,898      56,805      27,841         265      10,109      1,663
- ----------------------------------------------------------------------------------------------------------------------------------
Net increase/(decrease) in net assets
 resulting from operations                         91,414      34,050      57,157      14,959         144      10,630      1,970
- ----------------------------------------------------------------------------------------------------------------------------------
Dividends and Distributions:
Net investment income                              (4,361)     (3,002)         --          --         (21)       (645)       (76)
Dividends (in excess of net investment income)         --          --          --          --          --          --         -- 
Net realized gain from investment transactions     (9,976)     (3,331)         --      (3,020)         --         (59)       (83)
Distributions (in excess of realized gains)            --          --          --          --          --        (161)        -- 
Tax Return of Capital                                  --          --          --        (220)         --          --         -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Net decrease in net assets from
 dividends and distributions                      (14,337)     (6,333)         --      (3,240)        (21)       (865)      (159)
- ----------------------------------------------------------------------------------------------------------------------------------
Capital Share Transactions:
Shares sold
  Institutional Shares                            244,131     183,993     204,318     210,533       9,452     185,562     26,943
  Retirement Shares                                    10          --          10          --          10          10         -- 
Reinvested dividends and distributions
  Institutional Shares                             14,337       6,333          --       3,240          21         864        159
  Retirement Shares                                    --          --          --          --          --          --         -- 
Shares repurchased
  Institutional Shares                            (53,051)    (19,165)   (136,967)    (27,710)     (2,760)    (62,291)    (3,329)
  Retirement Shares                                    --          --          --          --          --          --         -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Net increase/(decrease) in net assets from
  capital share transactions                      205,427     171,161      67,361     186,063       6,723     124,145     23,773
- ----------------------------------------------------------------------------------------------------------------------------------
Net increase/(decrease) in net assets             282,504     198,878     124,518     197,782       6,846     133,910     25,584
- ----------------------------------------------------------------------------------------------------------------------------------
Net Assets:
Beginning of period                               325,789     126,911     383,693     185,911          --      27,192      1,608
- ----------------------------------------------------------------------------------------------------------------------------------
End of Period                                   $ 608,293   $ 325,789   $ 508,211   $ 383,693   $   6,846   $ 161,102   $ 27,192
==================================================================================================================================
Net Assets consist of:
Capital (par value and paid-in surplus)*        $ 485,858   $ 280,430   $ 404,537   $ 337,407   $   6,723   $ 149,136   $ 24,992
Undistributed net investment
 income/(distribution in excess)*                     117         123          --           2           4          80         12
Undistributed net realized
 gain/(loss) from investments*                     47,894       9,937      (9,994)    (10,580)       (146)       (206)       207
Unrealized appreciation/(depreciation)
 of investments                                    74,424      35,299     113,668      56,864         265      12,092      1,981
- ----------------------------------------------------------------------------------------------------------------------------------
                                                $ 608,293   $ 325,789   $ 508,211   $ 383,693   $   6,846   $ 161,102   $ 27,192
==================================================================================================================================
Transactions in Portfolio Shares
 - Institutional Shares
Shares sold                                        14,157      12,447      11,104      11,507         765      10,297      1,817
Reinvested dividends and distributions                829         426          --         176           2          46         11
- ----------------------------------------------------------------------------------------------------------------------------------
Total                                              14,986      12,873      11,104      11,683         767      10,343      1,828
Shares repurchased                                 (3,068)     (1,306)     (7,417)     (1,528)       (226)     (3,357)      (233)
- ----------------------------------------------------------------------------------------------------------------------------------
Net increase/decrease in portfolio shares          11,918      11,567       3,687      10,155         541       6,986      1,595
- ----------------------------------------------------------------------------------------------------------------------------------
Shares outstanding beginning of period             21,003       9,436      21,040      10,885          --       1,730        135
- ----------------------------------------------------------------------------------------------------------------------------------
Shares outstanding end of period                   32,921      21,003      24,727      21,040         541       8,716      1,730
==================================================================================================================================
Transactions in Portfolio Shares
 - Retirement Shares(3)
Shares sold                                           618          --         620          --       1,000         595         -- 
Reinvested dividends and distributions                 17          --          --          --          --           4         -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Total                                                 635          --         620          --       1,000         599         -- 
Shares repurchased                                     --          --          --          --          --          --         -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Net increase/decrease in portfolio shares             635          --         620          --       1,000         599         -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Shares outstanding beginning of period                 --          --          --          --          --          --         -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Shares outstanding end of period                      635          --         620          --       1,000         599         -- 
==================================================================================================================================
Purchases and Sales of Investment Securities:
  (excluding Short-Term Securities)
Purchases of Securities                         $ 713,049   $ 279,406   $ 583,004   $ 411,187   $   6,590   $ 193,061   $ 19,784
Proceeds from Sales of Securities                 506,228     151,544     509,947     242,452       1,165      73,634      3,941
Purchases of Long-Term
 U.S. Government Obligations                           --          --          --          --          --          --         -- 
Proceeds from Sales of Long-Term
 U.S. Government Obligations                           --          --          --          --          --          --         -- 
==================================================================================================================================
</TABLE>

                STATEMENTS OF CHANGES IN NET ASSETS (Continued)
<TABLE>
<CAPTION>
                                                     Janus Aspen             Janus Aspen       Janus Aspen       Janus Aspen
For the fiscal year or period ended               Worldwide Growth            Balanced        Equity Income    Flexible Income
December 31 (all numbers in thousands(3))             Portfolio               Portfolio         Portfolio         Portfolio
- ----------------------------------------------------------------------------------------------------------------------------------
                                                     1997        1996        1997        1996      1997(1)       1997       1996
- ----------------------------------------------------------------------------------------------------------------------------------
Operations:
<S>                                             <C>         <C>         <C>         <C>         <C>         <C>         <C>     
Net investment income/(loss)                    $   7,744   $   2,521   $   5,061   $   1,270   $       3   $   2,522   $  1,307
Net realized gain/(loss) from
 investment transactions                           46,834      11,302      13,320       1,768          71         683        324
Change in unrealized net appreciation
 or (depreciation) of investments                 135,768      54,851      15,763       3,680          80       1,050        277
- ----------------------------------------------------------------------------------------------------------------------------------
Net increase/(decrease) in net assets
 resulting from operations                        190,346      68,674      34,144       6,718         154       4,255      1,908
- ----------------------------------------------------------------------------------------------------------------------------------
Dividends and Distributions:
Net investment income                              (9,330)     (4,109)     (5,104)     (1,165)         (2)     (2,372)    (1,255)
Dividends (in excess of net investment income)     (1,332)         --          --          --          --          --         -- 
Net realized gain from investment transactions     (8,190)     (2,028)     (1,791)       (278)         --        (322)      (272)
Distributions (in excess of realized gains)            --          --          --          --          --          --         -- 
Tax Return of Capital                                  --          --          --          --          --          --         -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Net decrease in net assets from
 dividends and distributions                      (18,852)     (6,137)     (6,895)     (1,443)         (2)     (2,694)    (1,527)
- ----------------------------------------------------------------------------------------------------------------------------------
Capital Share Transactions:
Shares sold
  Institutional Shares                            897,983     431,848     254,907      72,698       3,884      35,431     20,543
  Retirement Shares                                   402          --          10          --          10          10         -- 
Reinvested dividends and distributions
  Institutional Shares                             18,852       6,137       7,744       1,443           2       2,693      1,527
  Retirement Shares                                    --          --          --          --          --           1         -- 
Shares repurchased
  Institutional Shares                            (94,383)    (26,482)    (12,969)     (7,957)       (988)    (10,902)    (7,967)
  Retirement Shares                                    --          --          --          --          --          --         -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Net increase/(decrease) in net assets from
  capital share transactions                      822,854     411,503     249,692      66,184       2,908      27,233     14,103
- ----------------------------------------------------------------------------------------------------------------------------------
Net increase/(decrease) in net assets             994,348     474,040     276,941      71,459       3,060      28,794     14,484
- ----------------------------------------------------------------------------------------------------------------------------------
Net Assets:
Beginning of period                               582,603     108,563      85,480      14,021          --      25,315     10,831
- ----------------------------------------------------------------------------------------------------------------------------------
End of Period                                   $1,576,951  $ 582,603   $ 362,421   $  85,480   $   3,060   $  54,109   $ 25,315
==================================================================================================================================
Net Assets consist of:
Capital (par value and paid-in surplus)*        $1,327,595  $ 504,741   $ 328,723   $  79,031   $   2,908   $  51,530   $ 24,297
Undistributed net investment
 income/(distribution in excess)*                   1,556       1,586         129         114           1         208         46
Undistributed net realized
 gain/(loss) from investments*                     43,642       7,886      13,228       1,758          71         672        322
Unrealized appreciation/(depreciation)
 of investments                                   204,158      68,390      20,341       4,577          80       1,699        650
- ----------------------------------------------------------------------------------------------------------------------------------
                                                $1,576,951  $ 582,603   $ 362,421   $  85,480   $   3,060   $  54,109   $ 25,315
==================================================================================================================================
Transactions in Portfolio Shares
 - Institutional Shares
Shares sold                                        40,742      24,029      15,268       5,179         301       3,048      1,853
Reinvested dividends and distributions                819         328         470         101          --         234        139
- ----------------------------------------------------------------------------------------------------------------------------------
Total                                              41,561      24,357      15,738       5,280         301       3,282      1,992
Shares repurchased                                 (4,123)     (1,479)       (776)       (567)        (75)       (941)      (715)
- ----------------------------------------------------------------------------------------------------------------------------------
Net increase/decrease in portfolio shares          37,438      22,878      14,962       4,713         226       2,341      1,277
- ----------------------------------------------------------------------------------------------------------------------------------
Shares outstanding beginning of period             29,968       7,090       5,789       1,076          --       2,252        975
- ----------------------------------------------------------------------------------------------------------------------------------
Shares outstanding end of period                   67,406      29,968      20,751       5,789         226       4,593      2,252
==================================================================================================================================
Transactions in Portfolio Shares
 - Retirement Shares(3)
Shares sold                                        17,245          --         650          --       1,000         876         -- 
Reinvested dividends and distributions                  6          --          19          --          --          56         -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Total                                              17,251          --         669          --       1,000         932         -- 
Shares repurchased                                     --          --          --          --          --          --         -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Net increase/decrease in portfolio shares          17,251          --         669          --       1,000         932         -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Shares outstanding beginning of period                 --          --          --          --          --          --         -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Shares outstanding end of period                   17,251          --         669          --       1,000         932         -- 
==================================================================================================================================
Purchases and Sales of Investment Securities:
  (excluding Short-Term Securities)
Purchases of Securities                         $1,715,083  $ 532,495   $ 377,245   $  95,054   $   3,560   $  46,074   $ 44,707
Proceeds from Sales of Securities                 862,382     170,371     221,317      39,718         997      31,006     34,221
Purchases of Long-Term
 U.S. Government Obligations                           --          --      70,831       4,833          --      15,463      7,738
Proceeds from Sales of Long-Term
 U.S. Government Obligations                           --          --      13,669       2,154          --       7,755      6,051
==================================================================================================================================
</TABLE>

                STATEMENTS OF CHANGES IN NET ASSETS (Continued)
<TABLE>
<CAPTION>
                                                     Janus Aspen             Janus Aspen             Janus Aspen
For the fiscal year or period ended                  High-Yield            Short-Term Bond          Money Market
December 31 (all numbers in thousands(3))             Portfolio               Portfolio               Portfolio
- ----------------------------------------------------------------------------------------------------------------------------------
                                                     1997      1996(2)       1997        1996        1997        1996
- ----------------------------------------------------------------------------------------------------------------------------------
Operations:
<S>                                             <C>         <C>         <C>         <C>         <C>         <C>      
Net investment income/(loss)                    $     125   $      26   $     724   $     389   $     461   $     183
Net realized gain/(loss) from
 investment transactions                               67           6          48           4          --          -- 
Change in unrealized net appreciation
 or (depreciation) of investments                      39          26          18         (28)         --          -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Net increase/(decrease) in net assets
 resulting from operations                            231          58         790         365         461         183
- ----------------------------------------------------------------------------------------------------------------------------------
Dividends and Distributions:
Net investment income                                (117)        (24)       (722)       (370)       (461)       (183)
Dividends (in excess of net investment income)         --          --          --          --          --          -- 
Net realized gain from investment transactions         (6)         --          (4)         (6)         --          -- 
Distributions (in excess of realized gains)            --          --          --          --          --          -- 
Tax Return of Capital                                  --          --          --          --          --          -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Net decrease in net assets from
 dividends and distributions                         (123)        (24)       (726)       (376)       (461)       (183)
- ----------------------------------------------------------------------------------------------------------------------------------
Capital Share Transactions:
Shares sold
  Institutional Shares                              3,976       1,491      23,232      13,981      78,614      28,902
  Retirement Shares                                    10          --          10          --          10          -- 
Reinvested dividends and distributions
  Institutional Shares                                122          24         724         376         461         184
  Retirement Shares                                     1          --           2          --          --          -- 
Shares repurchased
  Institutional Shares                             (2,075)       (766)    (33,188)     (5,632)    (69,807)    (24,715)
  Retirement Shares                                    --          --          --          --          --          -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Net increase/(decrease) in net assets from
  capital share transactions                        2,034         749      (9,220)      8,725       9,278       4,371
- ----------------------------------------------------------------------------------------------------------------------------------
Net increase/(decrease) in net assets               2,142         783      (9,156)      8,714       9,278       4,371
- ----------------------------------------------------------------------------------------------------------------------------------
Net Assets:
Beginning of period                                   783          --      11,901       3,187       6,106       1,735
- ----------------------------------------------------------------------------------------------------------------------------------
End of Period                                   $   2,925   $     783   $   2,745   $  11,901   $  15,384   $   6,106
==================================================================================================================================
Net Assets consist of:
Capital (par value and paid-in surplus)*        $   2,783   $     749   $   2,646   $  11,866   $  15,384   $   6,106
Undistributed net investment
 income/(distribution in excess)*                      12           2          39          36          --          -- 
Undistributed net realized
 gain/(loss) from investments*                         66           6          47           3          --          -- 
Unrealized appreciation/(depreciation)
 of investments                                        64          26          13          (4)         --          -- 
- ----------------------------------------------------------------------------------------------------------------------------------
                                                $   2,925   $     783   $   2,745   $  11,901   $  15,384   $   6,106
==================================================================================================================================
Transactions in Portfolio Shares
 - Institutional Shares
Shares sold                                           343         140       2,279       1,398      78,614      28,902
Reinvested dividends and distributions                 11           2          78          38         461         184
- ----------------------------------------------------------------------------------------------------------------------------------
Total                                                 354         142       2,357       1,436      79,075      29,086
Shares repurchased                                   (179)        (70)     (3,242)       (561)    (69,807)    (24,715)
- ----------------------------------------------------------------------------------------------------------------------------------
Net increase/decrease in portfolio shares             175          72        (885)        875       9,268       4,371
- ----------------------------------------------------------------------------------------------------------------------------------
Shares outstanding beginning of period                 72          --       1,193         318       6,106       1,735
- ----------------------------------------------------------------------------------------------------------------------------------
Shares outstanding end of period                      247          72         308       1,193      15,374       6,106
==================================================================================================================================
Transactions in Portfolio Shares
 - Retirement  Shares(3)
Shares sold                                           893          --         986          --      10,000          -- 
Reinvested dividends and distributions                 57          --         191          --         306          -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Total                                                 950          --       1,177          --      10,306          -- 
Shares repurchased                                     --          --          --          --          --          -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Net increase/decrease in portfolio shares             950          --       1,177          --      10,306          -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Shares outstanding beginning of period                 --          --          --          --          --          -- 
- ----------------------------------------------------------------------------------------------------------------------------------
Shares outstanding end of period                      950          --       1,177          --      10,306          -- 
==================================================================================================================================
Purchases and Sales of Investment Securities:
  (excluding Short-Term Securities)
Purchases of Securities                         $   6,515   $   1,595   $   8,593   $  13,059          --          -- 
Proceeds from Sales of Securities                   4,066         871      14,559       8,202          --          -- 
Purchases of Long-Term
 U.S. Government Obligations                           24          --      12,611      24,287          --          -- 
Proceeds from Sales of Long-Term
 U.S. Government Obligations                           25          --      16,534      21,010          --          -- 
==================================================================================================================================
</TABLE>
(1) Period May 1, 1997 (inception) to December 31, 1997.
(2) Period May 1, 1996 (inception) to December 31, 1996.
(3) Transactions  in  Portfolio  Shares - Retirement  Shares  numbers are not in
    thousands.
 *  See Note 3 in Notes to Financial Statements.

See Notes to Financial Statements.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

                  FINANCIAL HIGHLIGHTS - INSTITUTIONAL SHARES
<TABLE>
<CAPTION>
                                                                                   Janus Aspen
For a share outstanding throughout                                                   Growth
each fiscal year or period ended December 31                                        Portfolio
- --------------------------------------------------------------------------------------------------------------------------
                                                             1997          1996          1995          1994        1993(1)  
- --------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>           <C>           <C>           <C>           <C>      
Net asset value, beginning of period                    $   15.51     $   13.45     $   10.57     $   10.32     $   10.00
- --------------------------------------------------------------------------------------------------------------------------
Income from investment operations
Net investment income/(loss)                                  .15           .17           .28           .09           .03
Net gains or (losses) on securities
 (both realized and unrealized)                              3.34          2.29          2.90           .20           .32
- --------------------------------------------------------------------------------------------------------------------------
Total from investment operations                             3.49          2.46          3.18           .29           .35
- --------------------------------------------------------------------------------------------------------------------------
Less distributions
Dividends (from net investment income)                       (.15)         (.17)         (.30)         (.04)         (.03)
Dividends (in excess of net investment income)                 --            --            --            --            -- 
Distributions (from capital gains)                           (.37)         (.23)           --            --            -- 
Distributions (in excess of realized gains)                    --            --            --            --            -- 
Tax Return of Capital                                          --            --            --            --            -- 
- --------------------------------------------------------------------------------------------------------------------------
Total distributions                                          (.52)         (.40)         (.30)         (.04)         (.03)
- --------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                          $   18.48     $   15.51     $   13.45     $   10.57     $   10.32
==========================================================================================================================
Total return**                                              22.75%        18.45%        30.17%         2.76%         3.50%
==========================================================================================================================
Net assets, end of period (in thousands)                $ 608,281     $ 325,789     $ 126,911     $  43,549     $   7,482
Average net assets for the period (in thousands)        $ 477,914     $ 216,125     $  77,344     $  26,464     $   3,191
Ratio of gross expenses to average net assets*(6)            0.70%         0.69%         0.78%          N/A           N/A
Ratio of net expenses to average net assets*(6)              0.69%         0.69%         0.76%         0.88%         0.25%
Ratio of net investment income to average net assets*        0.91%         1.39%         1.24%         1.45%         2.54%
Portfolio turnover rate*                                      122%           87%          185%          169%          162%
Average commission per share                            $  0.0500     $  0.0466           N/A           N/A           N/A
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>

            FINANCIAL HIGHLIGHTS - INSTITUTIONAL SHARES (Continued)
<TABLE>
<CAPTION>
                                                                                   Janus Aspen
For a share outstanding throughout                                              Aggressive Growth
each fiscal year or period ended December 31                                        Portfolio
- --------------------------------------------------------------------------------------------------------------------------
                                                             1997          1996          1995          1994        1993(1)
- --------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>           <C>           <C>           <C>           <C>      
Net asset value, beginning of period                    $   18.24     $   17.08     $   13.62     $   11.80     $   10.00
- --------------------------------------------------------------------------------------------------------------------------
Income from investment operations
Net investment income/(loss)                                   --            --           .24           .11           .01
Net gains or (losses) on securities
 (both realized and unrealized)                              2.31          1.36          3.47          1.82          1.80
- --------------------------------------------------------------------------------------------------------------------------
Total from investment operations                             2.31          1.36          3.71          1.93          1.81
- --------------------------------------------------------------------------------------------------------------------------
Less distributions
Dividends (from net investment income)                         --            --          (.25)         (.11)         (.01)
Dividends (in excess of net investment income)                 --            --            --            --            -- 
Distributions (from capital gains)                             --          (.19)           --            --            -- 
Distributions (in excess of realized gains)                    --            --            --            --            -- 
Tax Return of Capital                                          --          (.01)           --            --            -- 
- --------------------------------------------------------------------------------------------------------------------------
Total distributions                                            --          (.20)         (.25)         (.11)         (.01)
- --------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                          $   20.55     $   18.24     $   17.08     $   13.62     $   11.80
==========================================================================================================================
Total return**                                              12.66%         7.95%        27.48%        16.33%        18.05%
==========================================================================================================================
Net assets, end of period (in thousands)                $ 508,198     $ 383,693     $ 185,911     $  41,289     $   1,985
Average net assets for the period (in thousands)        $ 418,464     $ 290,629     $ 107,582     $  14,152     $   1,091
Ratio of gross expenses to average net assets*(6)            0.76%         0.76%         0.86%          N/A           N/A
Ratio of net expenses to average net assets*(6)              0.76%         0.76%         0.84%         1.05%         0.25%
Ratio of net investment income to average net assets*       (0.10%)       (0.27%)        0.58%         2.18%         0.34%
Portfolio turnover rate*                                      130%           88%          155%          259%           31%
Average commission per share                            $  0.0367     $  0.0347           N/A           N/A           N/A
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>

            FINANCIAL HIGHLIGHTS - INSTITUTIONAL SHARES (Continued)
<TABLE>
<CAPTION>
                                                       Janus Aspen         
                                                         Capital                          Janus Aspen
For a share outstanding throughout                    Appreciation                    International Growth
each fiscal year or period ended December 31            Portfolio                          Portfolio
- --------------------------------------------------------------------------------------------------------------------------
                                                           1997(2)         1997          1996          1995        1994(3)  
- --------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>           <C>           <C>           <C>           <C>      
Net asset value, beginning of period                    $   10.00     $   15.72     $   11.95     $    9.72     $   10.00
- --------------------------------------------------------------------------------------------------------------------------
Income from investment operations
Net investment income/(loss)                                  .05           .11           .05           .09          (.09)
Net gains or (losses) on securities
 (both realized and unrealized)                              2.61          2.80          4.06          2.16          (.19)
- --------------------------------------------------------------------------------------------------------------------------
Total from investment operations                             2.66          2.91          4.11          2.25          (.28)
- --------------------------------------------------------------------------------------------------------------------------
Less distributions
Dividends (from net investment income)                       (.04)         (.11)         (.11)         (.02)           -- 
Dividends (in excess of net investment income)                 --            --            --            --            -- 
Distributions (from capital gains)                             --          (.01)         (.23)           --            -- 
Distributions (in excess of realized gains)                    --          (.03)           --            --            -- 
Tax Return of Capital                                          --            --            --            --            -- 
- --------------------------------------------------------------------------------------------------------------------------
Total distributions                                          (.04)         (.15)         (.34)         (.02)           -- 
- --------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                          $   12.62     $   18.48     $   15.72     $   11.95     $    9.72
==========================================================================================================================
Total return**                                              26.60%        18.51%        34.71%        23.15%        (2.80%)
==========================================================================================================================
Net assets, end of period (in thousands)                $   6,833     $ 161,091     $  27,192     $   1,608     $   1,353
Average net assets for the period (in thousands)        $   2,632     $  96,164     $   7,437     $   1,792     $   1,421
Ratio of gross expenses to average net assets*(6)            1.26%         0.96%         1.26%         2.69%          N/A
Ratio of net expenses to average net assets*(6)              1.25%         0.96%         1.25%         2.50%         2.50%
Ratio of net investment income to average net assets*        1.43%         0.70%         0.62%         (.80%)       (1.30%)
Portfolio turnover rate*                                      101%           86%           65%          211%          275%
Average commission per share                            $  0.0375     $  0.0241     $  0.0305           N/A           N/A
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>

            FINANCIAL HIGHLIGHTS - INSTITUTIONAL SHARES (Continued)
<TABLE>
<CAPTION>
                                                                                   Janus Aspen
For a share outstanding throughout                                              Worldwide Growth
each fiscal year or period ended December 31                                        Portfolio
- --------------------------------------------------------------------------------------------------------------------------
                                                             1997          1996          1995          1994        1993(1)
- --------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>           <C>           <C>           <C>           <C>      
Net asset value, beginning of period                    $   19.44     $   15.31     $   12.07     $   11.89     $   10.00
- --------------------------------------------------------------------------------------------------------------------------
Income from investment operations
Net investment income/(loss)                                  .16           .16           .11           .04           .02
Net gains or (losses) on securities
 (both realized and unrealized)                              4.14          4.27          3.19           .14          1.89
- --------------------------------------------------------------------------------------------------------------------------
Total from investment operations                             4.30          4.43          3.30           .18          1.91
- --------------------------------------------------------------------------------------------------------------------------
Less distributions
Dividends (from net investment income)                       (.17)         (.17)         (.06)           --          (.01)
Dividends (in excess of net investment income)               (.02)           --            --            --            --
Distributions (from capital gains)                           (.16)         (.13)           --            --          (.01)
Distributions (in excess of realized gains)                    --            --            --            --            --
Tax Return of Capital                                          --            --            --            --            --
- --------------------------------------------------------------------------------------------------------------------------
Total distributions                                          (.35)         (.30)         (.06)           --          (.02)
- --------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                          $   23.39     $   19.44     $   15.31     $   12.07     $   11.89
==========================================================================================================================
Total return**                                              22.15%        29.04%        27.37%         1.53%        19.10%
==========================================================================================================================
Net assets, end of period (in thousands)                $1,576,548    $ 582,603     $ 108,563     $  37,728     $   4,856
Average net assets for the period (in thousands)        $1,148,951    $ 304,111     $  59,440     $  22,896     $   2,200
Ratio of gross expenses to average net assets*(6)            0.74%         0.80%         0.90%          N/A           N/A
Ratio of net expenses to average net assets*(6)              0.74%         0.80%         0.87%         1.18%         0.25%
Ratio of net investment income to average net assets*        0.67%         0.83%         0.95%         0.50%         0.84%
Portfolio turnover rate*                                       80%           62%          113%          217%           57%
Average commission per share                            $  0.0337     $  0.0345           N/A           N/A           N/A
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>

            FINANCIAL HIGHLIGHTS - INSTITUTIONAL SHARES (Continued)
<TABLE>
<CAPTION>
                                                                                   Janus Aspen
For a share outstanding throughout                                                  Balanced
each fiscal year or period ended December 31                                        Portfolio
- --------------------------------------------------------------------------------------------------------------------------
                                                             1997          1996          1995          1994        1993(1)
- --------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>           <C>           <C>           <C>           <C>      
Net asset value, beginning of period                    $   14.77     $   13.03     $   10.63     $   10.64     $   10.00
- --------------------------------------------------------------------------------------------------------------------------
Income from investment operations
Net investment income/(loss)                                  .34           .32           .17           .15           .08
Net gains or (losses) on securities
 (both realized and unrealized)                              2.89          1.81          2.45          (.06)          .64
- --------------------------------------------------------------------------------------------------------------------------
Total from investment operations                             3.23          2.13          2.62           .09           .72
- --------------------------------------------------------------------------------------------------------------------------
Less distributions
Dividends (from net investment income)                       (.35)         (.30)         (.22)         (.10)         (.08)
Distributions (from capital gains)                           (.18)         (.09)           --            --            --
- --------------------------------------------------------------------------------------------------------------------------
Total distributions                                         (0.53)         (.39)         (.22)         (.10)         (.08)
- --------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                          $   17.47     $   14.77     $   13.03     $   10.63     $   10.64
==========================================================================================================================
Total return**                                              22.10%        16.18%        24.79%         0.84%         7.20%
==========================================================================================================================
Net assets, end of period (in thousands)                $ 362,409     $  85,480     $  14,021     $   3,153     $     537
Average net assets for the period (in thousands)        $ 176,432     $  43,414     $   5,739     $   2,336     $     521
Ratio of gross expenses to average net assets*(6)            0.83%         0.94%         1.37%          N/A           N/A
Ratio of net expenses to average net assets*(6)              0.82%         0.92%         1.30%         1.57%         0.25%
Ratio of net investment income to average net assets*        2.87%         2.92%         2.41%         1.90%         2.69%
Portfolio turnover rate*                                      139%          103%          149%          158%          126%
Average commission per share                            $  0.0456     $  0.0426           N/A           N/A           N/A
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>

            FINANCIAL HIGHLIGHTS - INSTITUTIONAL SHARES (Continued)
<TABLE>
<CAPTION>
                                                                                   Janus Aspen
For a share outstanding throughout                                               Flexible Income
each fiscal year or period ended December 31                                        Portfolio
- --------------------------------------------------------------------------------------------------------------------------
                                                             1997          1996          1995          1994        1993(1)
- --------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>           <C>           <C>           <C>           <C>      
Net asset value, beginning of period                    $   11.24     $   11.11     $    9.48     $    9.97     $   10.00
- --------------------------------------------------------------------------------------------------------------------------
Income from investment operations
Net investment income/(loss)                                  .67           .74           .53           .47           .11
Net gains or (losses) on securities
 (both realized and unrealized)                               .62           .24          1.70          (.56)         (.04)
- --------------------------------------------------------------------------------------------------------------------------
Total from investment operations                             1.29           .98          2.23          (.09)          .07
- --------------------------------------------------------------------------------------------------------------------------
Less distributions
Dividends (from net investment income)                       (.64)         (.72)         (.60)         (.40)         (.10)
Distributions (from capital gains)                           (.11)         (.13)           --            --            --
- --------------------------------------------------------------------------------------------------------------------------
Total distributions                                          (.75)         (.85)         (.60)         (.40)         (.10)
- --------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                          $   11.78     $   11.24     $   11.11     $    9.48     $    9.97
==========================================================================================================================
Total return**                                              11.76%         9.19%        23.86%        (0.91%)        0.70%
==========================================================================================================================
Net assets, end of period (in thousands)                $  54,098     $  25,315     $  10,831     $   1,924     $     538
Average net assets for the period (in thousands)        $  36,547     $  17,889     $   5,556     $   1,636     $     497
Ratio of gross expenses to average net assets*(6)            0.75%         0.84%         1.07%          N/A           N/A
Ratio of net expenses to average net assets*(6)              0.75%         0.83%         1.00%         1.00%         1.00%
Ratio of net investment income to average net assets*        6.90%         7.31%         7.46%         5.49%         3.77%
Portfolio turnover rate*                                      119%          250%          236%          234%          508%
Average commission per share                                  N/A           N/A           N/A           N/A           N/A
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>

            FINANCIAL HIGHLIGHTS - INSTITUTIONAL SHARES (Continued)
<TABLE>
<CAPTION>
                                                       Janus Aspen
                                                         Equity             Janus Aspen
For a share outstanding throughout                       Income             High-Yield
each fiscal year or period ended December 31            Portfolio            Portfolio
- --------------------------------------------------------------------------------------------------------------------------
                                                           1997(2)         1997        1996(4)
- --------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>           <C>           <C>      
Net asset value, beginning of period                    $   10.00     $   10.83     $   10.00
- --------------------------------------------------------------------------------------------------------------------------
Income from investment operations
Net investment income/(loss)                                  .01           .70           .43
Net gains or (losses) on securities
 (both realized and unrealized)                              3.46           .99           .80
- --------------------------------------------------------------------------------------------------------------------------
Total from investment operations                             3.47          1.69          1.23
- --------------------------------------------------------------------------------------------------------------------------
Less distributions
Dividends (from net investment income)                       (.01)         (.68)         (.40)
Distributions (from capital gains)                             --          (.06)           -- 
- --------------------------------------------------------------------------------------------------------------------------
Total distributions                                          (.01)         (.74)         (.40)
- --------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                          $   13.46     $   11.78     $   10.83
==========================================================================================================================
Total return**                                              34.70%        15.98%        12.40%
==========================================================================================================================
Net assets, end of period (in thousands)                $   3,047     $   2,914     $     783
Average net assets for the period (in thousands)        $   1,101     $   1,565     $     459
Ratio of gross expenses to average net assets*(6)            1.25%         1.00%         1.01%
Ratio of net expenses to average net assets*(6)              1.25%         1.00%         1.00%
Ratio of net investment income to average net assets*        0.35%         7.98%         5.74%
Portfolio turnover rate*                                      128%          299%          301%
Average commission per share                            $  0.0382           N/A           N/A
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>

            FINANCIAL HIGHLIGHTS - INSTITUTIONAL SHARES (Continued)
<TABLE>
<CAPTION>
                                                                                   Janus Aspen
For a share outstanding throughout                                               Short-Term Bond
each fiscal year or period ended December 31                                        Portfolio
- --------------------------------------------------------------------------------------------------------------------------
                                                             1997          1996          1995          1994        1993(1)
- --------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>           <C>           <C>           <C>           <C>      
Net asset value, beginning of period                    $    9.97     $   10.03     $    9.72     $    9.93     $   10.00
- --------------------------------------------------------------------------------------------------------------------------
Income from investment operations
Net investment income/(loss)                                 1.85           .42           .60           .35           .11
Net gains or (losses) on securities
 (both realized and unrealized)                             (1.19)         (.03)          .31          (.26)         (.08)
- --------------------------------------------------------------------------------------------------------------------------
Total from investment operations                              .66           .39           .91           .09           .03
- --------------------------------------------------------------------------------------------------------------------------
Less distributions
Dividends (from net investment income)                      (1.75)         (.44)         (.60)         (.30)         (.10)
Distributions (from capital gains)                             --          (.01)           --            --            --
- --------------------------------------------------------------------------------------------------------------------------
Total distributions                                         (1.75)         (.45)         (.60)         (.30)         (.10)
- --------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                          $    8.88     $    9.97     $   10.03     $    9.72     $    9.93
==========================================================================================================================
Total return**                                               6.72%         3.98%         9.54%         0.92%         0.30%
==========================================================================================================================
Net assets, end of period (in thousands)                $   2,735     $  11,901     $   3,187     $   2,902     $     502
Average net assets for the period (in thousands)        $  12,407     $   7,168     $   2,727     $   1,774     $     492
Ratio of gross expenses to average net assets*(6)            0.65%         0.66%         0.70%          N/A           N/A
Ratio of net expenses to average net assets*(6)              0.65%         0.65%         0.65%         0.65%         0.65%
Ratio of net investment income to average net assets*        5.83%         5.44%         6.02%         5.00%         3.57%
Portfolio turnover rate*                                      204%          416%          417%          256%           91%
Average commission per share                                  N/A           N/A           N/A           N/A           N/A
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>

            FINANCIAL HIGHLIGHTS - INSTITUTIONAL SHARES (Continued)
<TABLE>
<CAPTION>
                                                                     Janus Aspen
For a share outstanding throughout                                  Money Market
each fiscal year or period ended December 31                          Portfolio
- --------------------------------------------------------------------------------------------------------------------------
                                                             1997          1996        1995(5)
- --------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>           <C>           <C>      
Net asset value, beginning of period                    $    1.00     $    1.00     $    1.00
- --------------------------------------------------------------------------------------------------------------------------
Income from investment operations
Net investment income/(loss)                                  .05           .05           .04
Net gains or (losses) on securities
 (both realized and unrealized)                                --            --            --
- --------------------------------------------------------------------------------------------------------------------------
Total from investment operations                              .05           .05           .04
- --------------------------------------------------------------------------------------------------------------------------
Less distributions
Dividends (from net investment income)                       (.05)         (.05)         (.04)
Distributions (from capital gains)                             --            --            --
- --------------------------------------------------------------------------------------------------------------------------
Total distributions                                          (.05)         (.05)         (.04)
- --------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                          $    1.00     $    1.00     $    1.00
==========================================================================================================================
Total return**                                               5.17%         5.05%         3.63%
==========================================================================================================================
Net assets, end of period (in thousands)                $  15,374     $   6,106     $   1,735
Average net assets for the period (in thousands)        $   8,926     $   3,715     $   1,543
Ratio of gross expenses to average net assets*(6)            0.50%         0.50%         0.50%
Ratio of net expenses to average net assets*(6)              0.50%         0.50%         0.50%
Ratio of net investment income to average net assets*        5.17%         4.93%         5.30%
Portfolio turnover rate*                                      N/A           N/A           N/A
Average commission per share                                  N/A           N/A           N/A
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>
 * Annualized for periods of less than one full year.
** Total Return not annualized for periods of less than 1 full year.
(1) Period September 13, 1993 (inception) to December 31, 1993.
(2) Period May 1, 1997 (inception) to December 31, 1997.
(3) Period May 2, 1994 (inception) to December 31, 1994.
(4) Period May 1, 1996 (inception) to December 31, 1996.
(5) Period May 1, 1995 (inception) to December 31, 1995.
(6) See footnote #5 in Notes to Financial Statements.

See Notes to Financial Statements.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

                    FINANCIAL HIGHLIGHTS - RETIREMENT SHARES
<TABLE>
<CAPTION>
                                                                    Janus Aspen  Janus Aspen  Janus Aspen  Janus Aspen             
For a share outstanding during the                     Janus Aspen  Aggressive     Capital   International  Worldwide   Janus Aspen
period May 1, 1997 (inception) to                        Growth       Growth    Appreciation    Growth       Growth      Balanced
December 31, 1997                                       Portfolio    Portfolio    Portfolio    Portfolio    Portfolio    Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
                                                            1997         1997         1997         1997         1997         1997
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>          <C>          <C>          <C>          <C>          <C>     
Net asset value, beginning of period                    $  16.18     $  16.12     $  10.00     $  16.80     $  20.72     $  15.38
- ------------------------------------------------------------------------------------------------------------------------------------
Income from investment operations                                                            
Net investment income/(loss)                                 .04         (.06)         .12          .04          .14          .27
Net gains or (losses) on securities                                                          
 (both realized and unrealized)                             2.71         4.43         2.50         1.73         2.80         2.30
- ------------------------------------------------------------------------------------------------------------------------------------
Total from investment operations                            2.75         4.37         2.62         1.77         2.94         2.57
- ------------------------------------------------------------------------------------------------------------------------------------
Less distributions                                                                           
Dividends (from net investment income)                      (.10)          --           --         (.09)        (.14)        (.30)
Distributions (from capital gains)                          (.37)          --           --         (.04)        (.16)        (.18)
- ------------------------------------------------------------------------------------------------------------------------------------
Total distributions                                         (.47)          --           --         (.13)        (.30)        (.48)
- ------------------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                          $  18.46     $  20.49     $  12.62     $  18.44     $  23.36     $  17.47
====================================================================================================================================
Total return**                                             17.22%       27.11%       26.20%       10.53%       14.22%       16.92%
====================================================================================================================================
Net assets, end of period (in thousands)                $     12     $     13     $     13     $     11     $    403     $     12
Average net assets for the period (in thousands)        $     11     $     11     $     12     $     11     $     11     $     11
Ratio of gross expenses to average net assets*(1)           1.20%        1.32%        1.73%        1.45%        1.26%        1.32%
Ratio of net expenses to average net assets*                1.20%        1.32%        1.73%        1.45%        1.26%        1.32%
Ratio of net investment income to average net assets*       0.29%       (0.62%)       1.55%        0.26%        0.16%        2.38%
Portfolio turnover rate*                                     122%         130%         101%          86%          80%         139%
Average commission per share                            $ 0.0500     $ 0.0367     $ 0.0375     $ 0.0241     $ 0.0337     $ 0.0456
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

              FINANCIAL HIGHLIGHTS - RETIREMENT SHARES (Continued)
<TABLE>
<CAPTION>
                     
                                                       Janus Aspen  Janus Aspen               Janus Aspen  Janus Aspen
For a share outstanding during the                       Equity      Flexible    Janus Aspen   Short-Term     Money  
period May 1, 1997 (inception) to                        Income       Income     High-Yield       Bond        Market 
December 31, 1997                                       Portfolio    Portfolio    Portfolio    Portfolio    Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
                                                            1997         1997         1997         1997         1997  
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>          <C>          <C>          <C>          <C>     
Net asset value, beginning of period                    $  10.00     $  11.41     $  11.19     $  10.14     $   1.00
- ------------------------------------------------------------------------------------------------------------------------------------
Income from investment operations                                                            
Net investment income/(loss)                                 .01          .50          .59          .56          .03
Net gains or (losses) on securities                                                          
 (both realized and unrealized)                             3.41          .58          .71         (.11)          -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Total from investment operations                            3.42         1.08         1.30          .45          .03
- ------------------------------------------------------------------------------------------------------------------------------------
Less distributions                                                                           
Dividends (from net investment income)                        --         (.61)        (.65)       (1.71)        (.03)
Distributions (from capital gains)                            --         (.11)        (.06)          --           -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Total distributions                                           --         (.72)        (.71)       (1.71)        (.03)
- ------------------------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                          $  13.42     $  11.77     $  11.78     $   8.88     $   1.00
====================================================================================================================================
Total return**                                             34.20%        9.73%       11.96%        4.53%        3.13%
====================================================================================================================================
Net assets, end of period (in thousands)                $     13     $     11     $     11     $     10     $     10
Average net assets for the period (in thousands)        $     12     $     10     $     11     $     10     $     10
Ratio of gross expenses to average net assets*(1)           1.74%        1.23%        1.50%        1.20%        1.00%
Ratio of net expenses to average net assets*                1.74%        1.23%        1.50%        1.19%        1.00%
Ratio of net investment income to average net assets*       0.07%        6.39%        7.42%        5.43%        4.66%
Portfolio turnover rate*                                     128%         119%         299%         204%         N/A
Average commission per share                            $ 0.0382          N/A          N/A          N/A          N/A
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
 * Annualized for periods of less than one full year.
** Total return not annualized for periods of less than 1 full year.
(1) See footnote #5 in Notes to Financial Statements.

See Notes to Financial Statements.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

                         NOTES TO FINANCIAL STATEMENTS

1. Organization and Significant Accounting Policies

Janus Aspen Series (the  "Trust") was  organized as a Delaware  Trust on May 20,
1993,  and is  registered  under the  Investment  Company Act of 1940 (the "1940
Act") as a no-load,  open-end management investment company. The Trust offers 11
Portfolios  or  series  of  shares  with  differing  investment  objectives  and
policies.  Seven Portfolios invest primarily in equity  securities:  Janus Aspen
Growth Portfolio,  Janus Aspen Aggressive Growth Portfolio,  Janus Aspen Capital
Appreciation Portfolio,  Janus Aspen International Growth Portfolio, Janus Aspen
Worldwide Growth Portfolio, Janus Aspen Equity Income Portfolio, and Janus Aspen
Balanced  Portfolio.  Three  Portfolios  invest  primarily  in  income-producing
securities:  Janus Aspen  Flexible  Income  Portfolio,  Janus  Aspen  High-Yield
Portfolio and Janus Aspen  Short-Term Bond  Portfolio.  Janus Aspen Money Market
Portfolio  invests in  short-term  money market  securities.  Each  Portfolio is
diversified  as defined in the 1940 Act,  with the  exception of the  Aggressive
Growth Portfolio and Capital Appreciation Portfolio, which are nondiversified.

Institutional  Shares of the Trust are issued and  redeemed  only in  connection
with  investment in and payments under variable  annuity  contracts and variable
life insurance contracts (collectively "variable insurance contracts"),  as well
as certain qualified retirement plans. Effective May 1, 1997, the Trust issued a
new class of shares, the Retirement  Shares.  Retirement Shares of the Trust are
issued and redeemed only in connection with certain qualified  retirement plans.
Janus Capital  invested $10,000 of initial seed capital in each Portfolio of the
Retirement Shares.

Organizational  costs for the Portfolio were borne by Janus Capital  Corporation
(the Trust's  investment  adviser).  Effective May 1, 1997, the Trust issued two
new series of shares,  the Janus Aspen  Capital  Appreciation  Portfolio and the
Janus Aspen Equity Income  Portfolio.  Janus Capital invested $10,000 of initial
seed capital in each Portfolio.

The following  accounting policies have been consistently  followed by the Trust
and are in  conformity  with  accounting  principles  generally  accepted in the
investment company industry.

Investment Valuation

Securities are valued at the closing price for securities  traded on a principal
securities  exchange  (U.S.  or  foreign)  and on the  NASDAQ  National  Market.
Securities traded on over-the-counter markets and listed securities for which no
sales are  reported  are  valued at the  latest  bid price (or yield  equivalent
thereof)  obtained from one or more dealers making a market for such  securities
or by a  pricing  service  approved  by  the  Trustees.  Short-term  investments
maturing  within 60 days and all money  market  securities  in the Money  Market
Portfolio are valued at amortized cost, which approximates market value. Foreign
securities  are converted to U.S.  dollars using  exchange rates at the close of
the New York Stock Exchange.  When market quotations are not readily  available,
securities are valued at fair value as determined in good faith under procedures
established by the Trustees.

Investment Transactions and Investment Income

Investment  transactions  are  accounted  for as of the date  purchased or sold.
Dividend  income is recorded on the  ex-dividend  date.  Certain  dividends from
foreign  securities  will be  recorded  as soon as the Trust is  informed of the
dividend if such  information is obtained  subsequent to the  ex-dividend  date.
Interest  income is recorded on the accrual basis and includes  amortization  of
discounts and premiums.  Gains and losses are determined on the identified  cost
basis, which is the same basis used for federal income tax purposes.

Forward Currency Transactions and Futures Contracts

The  Portfolios  enter into forward  currency  contracts in order to hedge their
exposure  to  changes  in  foreign  currency  exchange  rates on  their  foreign
portfolio  holdings  and to lock in the U.S.  dollar cost of firm  purchase  and
sales commitments denominated in foreign currencies. A forward currency contract
is a  commitment  to purchase  or sell a foreign  currency at a future date at a
negotiated  forward rate. The gain or loss arising from the  difference  between
the U.S.  dollar  cost of the  original  contract  and the value of the  foreign
currency in U.S.  dollars upon closing such contract is included in net realized
gain or loss on foreign currency  transactions.  Forward currency contracts held
by the  Portfolios  are  fully  collateralized  by other  securities,  which are
denoted in the accompanying  Schedule of Investments.  Such collateral is in the
possession of the  Portfolio's  custodian.  The collateral is evaluated daily to
ensure its  market  value  equals or exceeds  the  current  market  value of the
corresponding forward currency contracts.

Currency gain and loss is also calculated on payables and  receivables  that are
denominated in foreign  currencies.  The payables and  receivables are generally
related to security transactions and income.

Futures  contracts  are  marked to market  daily,  and the  variation  margin is
recorded as an unrealized  gain or loss.  When a contract is closed,  a realized
gain or loss is recorded equal to the difference between the opening and closing
value of the contract.  Generally, open forward and futures contracts are marked
to market (i.e.,  treated as realized and subject to  distribution)  for federal
income tax purposes at fiscal year-end.

Foreign-denominated assets and forward currency contracts may involve more risks
than domestic  transactions,  including:  currency risk,  political and economic
risk,  regulatory  risk,  and market  risk.  Risks may arise from the  potential
inability  of  a  counterparty  to  meet  the  terms  of  a  contract  and  from
unanticipated  movements in the value of foreign currencies relative to the U.S.
dollar.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

                    NOTES TO FINANCIAL STATEMENTS (CONTINUED)

The  Portfolios  may enter into  futures  contracts  and options on  securities,
financial indexes and foreign currencies,  forward contracts,  and interest-rate
swaps and swap-related  products.  The Portfolios  intend to use such derivative
instruments  primarily to hedge or protect from adverse  movements in securities
prices,  currency  rates or interest  rates.  The use of futures  contracts  and
options  may  involve  risks  such as the  possibility  of  illiquid  markets or
imperfect  correlation  between the value of the  contracts  and the  underlying
securities that the counterparty will fail to perform its obligations.

Additional Investment Risk

A portion of the Flexible  Income and  High-Yield  Portfolios may be invested in
lower-rated  debt securities that have a higher risk of default or loss of value
because of changes in the economy or in their respective industry.

Estimates

The preparation of financial  statements in conformity  with generally  accepted
accounting principles requires management to make estimates and assumptions that
affect  the  reported  amount  of  assets  and  liabilities  and  disclosure  of
contingent  assets and  liabilities at the date of the financial  statements and
the reported amounts of income and expenses during the reporting period.  Actual
results could differ from those estimates.

Dividend Distributions and Expenses

Each   Portfolio,   except  the  Money  Market   Portfolio,   makes   semiannual
distributions  of  substantially  all of its  investment  income  and an  annual
distribution  of its net  realized  capital  gains,  if any.  The  Money  Market
Portfolio  makes daily  distributions  of its income.  All dividends and capital
gains  distributions  from a Portfolio  will be  automatically  reinvested  into
additional shares of that Portfolio.

Each Portfolio bears expenses  incurred  specifically on its behalf as well as a
portion of general  expenses based  generally on the relative net assets of each
Portfolio.

Federal Income Taxes

No  provision  for  income  taxes  is  included  in the  accompanying  financial
statements as the Portfolios  intend to distribute to  shareholders  all taxable
investment  income and  realized  gains and  otherwise  comply with the Internal
Revenue Code applicable to regulated investment companies.

2. Investment Advisory Agreement and Other Transactions With Affiliates

Investment  advisory fees for each of the seven equity Portfolios are payable to
Janus  Capital  based upon  annual  rates of .75% of the first  $300  million of
average net  assets,  .70% of the next $200  million of average net assets,  and
 .65% of the  average  net assets in excess of $500  million.  Effective  July 1,
1997,  Janus Capital reduced the annual rate on the first $30 million of average
daily net assets from 1.00% to .75%.  However,  Janus  Capital  has  voluntarily
agreed to reduce each equity  Portfolio's  advisory  fee to the extent that such
fee exceeds the effective  rate of the Janus retail fund  corresponding  to such
Portfolio.   The  effective   rate  is  the  advisory  fee   calculated  by  the
corresponding retail fund as of the last day of each calendar quarter (expressed
as an annual rate). Janus Aspen Growth Portfolio,  Janus Aspen Aggressive Growth
Portfolio, Janus Aspen Capital Appreciation Portfolio, Janus Aspen International
Growth Portfolio,  Janus Aspen Worldwide Growth Portfolio,  Janus Aspen Balanced
Portfolio,  and Janus Aspen Equity Income Portfolio advisory fees are reduced to
the effective rates of Janus Fund,  Janus  Enterprise  Fund, Janus Olympus Fund,
Janus Overseas Fund, Janus Worldwide Fund, Janus Balanced Fund, and Janus Equity
Income Fund, respectively.  The effective rate for each Portfolio for the period
ended December 31, 1997,  was .65%,  .72%,  .71%,  .66%,  .65%,  .74%, and .75%,
respectively.  The  Flexible  Income and  Short-Term  Bond  Portfolios  are each
subject to advisory  fees  payable to Janus  Capital  based upon annual rates of
 .65% of the first $300  million of average  net assets  plus .55% of average net
assets in excess of $300 million.  The High-Yield  Portfolio's advisory fee rate
is payable at rates of .75% of the first $300 million of average net assets plus
 .65% of  average  net  assets  in  excess  of $300  million.  The  Money  Market
Portfolio's  advisory  fee rate is .25% of average  net assets.  For  additional
information on the specific fees for the Retirement Shares, please refer to note
4 of the financial statements.

Until at least April 30, 1998,  Janus  Capital has also agreed to reduce its fee
to the extent that normal  operating  expenses  exceed  1.25% of the average net
assets of the Capital  Appreciation,  International  Growth,  and Equity  Income
Portfolios,  1% of the average net assets of the Flexible  Income and High-Yield
Portfolios, .65% of the average net assets of the Short-Term Bond Portfolio, and
 .50% of the average net assets of the Money Market Portfolio for a fiscal year.

Janus  Capital may  terminate any of these fee waivers or reductions on at least
90 days notice to the Trustees

Officers and certain trustees of the Trust are also officers and/or directors of
Janus Capital; however, they receive no compensation from the Trust.

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

                    NOTES TO FINANCIAL STATEMENTS (CONTINUED)

DST Systems,  Inc.  (DST),  an affiliate  of Janus  Capital  through a degree of
common ownership, provides accounting systems to the Portfolios. DST Securities,
Inc., a wholly owned subsidiary of DST, provides  brokerage  services on certain
portfolio transactions. Brokerage commissions paid to DST Securities, Inc. serve
to reduce fees and expenses.  Brokerage  commissions paid, fees reduced, and the
net fees paid to DST for the period ended December 31, 1997, are noted below:

<TABLE>
<CAPTION>
                                             DST Securities, Inc.   Portfolio Expense   DST Systems
Portfolio                                     Commissions Paid*         Reduction*         Costs
- ---------------------------------------------------------------------------------------------------
<S>                                                 <C>                   <C>             <C>    
Janus Aspen Growth Portfolio                        $2,819                $2,114          $15,421
- ---------------------------------------------------------------------------------------------------
Janus Aspen Aggressive Growth Portfolio              6,780                 5,085           13,699
- ---------------------------------------------------------------------------------------------------
Janus Aspen Capital Appreciation Portfolio              --                    --            3,876
- ---------------------------------------------------------------------------------------------------
Janus Aspen International Growth Portfolio              --                    --           10,858
- ---------------------------------------------------------------------------------------------------
Janus Aspen Worldwide Growth Portfolio               6,697                 5,023           21,868
- ---------------------------------------------------------------------------------------------------
Janus Aspen Balanced Portfolio                         391                   293           12,195
- ---------------------------------------------------------------------------------------------------
Janus Aspen Equity Income Portfolio                     15                    11            2,784
- ---------------------------------------------------------------------------------------------------
Janus Aspen Flexible Income Portfolio                   --                    --            9,905
- ---------------------------------------------------------------------------------------------------
Janus Aspen High-Yield Portfolio                        --                    --            9,069
- ---------------------------------------------------------------------------------------------------
Janus Aspen Short-Term Bond Portfolio                   --                    --            9,429
- ---------------------------------------------------------------------------------------------------
Janus Aspen Money Market Portfolio                      --                    --            9,275
- ---------------------------------------------------------------------------------------------------
</TABLE>
* The difference between  commissions paid to DST Securities,  Inc. and expenses
  reduced constituted commissions paid to an unaffiliated clearing broker.

3. Federal Income Tax

The  Portfolios  have  elected  to treat  gains and  losses on  forward  foreign
currency contracts as capital gains and losses. Other foreign currency gains and
losses on debt instruments are treated as ordinary income for federal income tax
purposes  pursuant to Section 988 of the Internal  Revenue  Code. As of December
31, 1997,  the net capital loss  carryovers  noted below are available to offset
future   realized   capital  gains  and  thereby  reduce  future  taxable  gains
distributions.  These carryovers  expire between December 31, 2004, and December
31, 2005. In 1997, the Portfolios  noted below  incurred  "post-October"  losses
during the period from November 1 through  December 31, 1997.  These losses will
be deferred for tax purposes and recognized in 1998.

The aggregate cost of investments and the composition of unrealized appreciation
and  depreciation  of investments for federal income tax purposes as of December
31, 1997, are also noted below.

<TABLE>
<CAPTION>
                                                                        at December 31, 1997
                                ----------------------------------------------------------------------------------------------------
                                Net Capital Loss  Post-October      Federal Tax       Unrealized      Unrealized   Net Appreciation/
Portfolio                          Carryovers         Losses            Cost         Appreciation   (Depreciation)   (Depreciation)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                               <C>             <C>              <C>               <C>             <C>              <C>         
Janus Aspen
 Growth Portfolio                          --     ($   336,826)    $  535,556,002    $ 91,406,750    ($16,890,636)    $ 74,516,114
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen
 Aggressive Growth Portfolio      ($9,224,354)              --        401,374,521     120,338,785      (7,440,255)     112,898,530
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen
 Capital Appreciation Portfolio       (25,613)        (120,295)         6,678,289         464,881        (200,220)         264,661
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen
 International Growth Portfolio            --       (2,607,314)       152,838,923      17,775,845      (6,278,779)      11,497,066
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen
 Worldwide Growth Portfolio                --      (17,297,533)     1,365,854,607     250,731,906     (53,968,527)     196,763,379
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen
 Balanced Portfolio                        --               --        350,008,740      24,902,659      (4,535,589)      20,367,070
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen
 Equity Income Portfolio                   --           (2,372)         2,946,768         176,097         (96,304)          79,793
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen
 Flexible Income Portfolio                 --               --         51,319,358       1,712,103         (43,793)       1,668,310
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen
 High-Yield Portfolio                      --               --          3,474,082          78,588         (14,292)          64,296
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen
 Short-Term Bond Portfolio                 --               --          2,701,859          13,672            (197)          13,475
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen
 Money Market Portfolio                    --               --         14,480,172              --              --               --
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

                    NOTES TO FINANCIAL STATEMENTS (CONTINUED)

Net  investment  income   distributions  and  capital  gains  distributions  are
determined  in  accordance  with  income tax  regulations  that may differ  from
generally accepted accounting principles. These differences are due to differing
treatments  for  items  such  as  deferral  of  wash  sales,   foreign  currency
transactions,  net operating losses, and capital loss  carryforwards.  Permanent
items  identified in the period ended December 31, 1997, have been  reclassified
among the components of net assets as follows:

<TABLE>
<CAPTION>
                                                Undistributed      Undistributed
                                                Net Investment      Net Realized        Paid-In
Portfolio                                           Income        Gains and Losses      Capital
- -------------------------------------------------------------------------------------------------
<S>                                              <C>                <C>                <C>
Janus Aspen Growth Portfolio                     ($   42,360)       $    42,360               --
- -------------------------------------------------------------------------------------------------
Janus Aspen Aggressive Growth Portfolio              435,562           (202,018)       ($233,544)
- -------------------------------------------------------------------------------------------------
Janus Aspen Capital Appreciation Portfolio                --                 --               --
- -------------------------------------------------------------------------------------------------
Janus Aspen International Growth Portfolio            42,338            (42,338)              --
- -------------------------------------------------------------------------------------------------
Janus Aspen Worldwide Growth Portfolio             2,792,246         (2,792,246)              --
- -------------------------------------------------------------------------------------------------
Janus Aspen Balanced Portfolio                        58,783            (58,783)              --
- -------------------------------------------------------------------------------------------------
Janus Aspen Equity Income Portfolio                       (5)                 5               --
- -------------------------------------------------------------------------------------------------
Janus Aspen Flexible Income Portfolio                 10,855            (10,855)              --
- -------------------------------------------------------------------------------------------------
Janus Aspen High-Yield Portfolio                         989               (989)              --
- -------------------------------------------------------------------------------------------------
Janus Aspen Short-Term Bond Portfolio                     --                 --               --
- -------------------------------------------------------------------------------------------------
Janus Aspen Money Market Portfolio                        --                 --               --
- -------------------------------------------------------------------------------------------------
</TABLE>

4. Expenses

The Portfolios' expenses may be reduced through expense reduction  arrangements.
Those arrangements include the use of broker commissions paid to DST Securities,
Inc.  and  uninvested  cash  balances  earning  interest  with  the  Portfolios'
custodian.  The Statements of Operations  reflect the total expenses  before any
offset,  the amount of the offset,  and the net  expenses.  The  expense  ratios
listed in the Financial  Highlights reflect expenses prior to any expense offset
(gross expense ratio) and after expense offsets (net expense ratio).

Janus  Aspen  Series  Retirement  Shares  incur a pro rata  share  of  operating
expenses.  In addition,  the Retirement  Shares pay a distribution  fee of up to
 .25% of average net assets and a participant administration fee of up to .25% of
average net assets.

5. Expense Ratios

Listed below are the expense ratios for the various  Portfolios that would be in
effect,  absent the waiver of certain  fees and/or  voluntary  reduction  of the
adviser's fee to the effective rate of the corresponding Janus retail fund.

<TABLE>
<CAPTION>
                                                              Institutional Shares                  Retirement Shares
Portfolio                                       1997       1996       1995       1994       1993           1997
- ---------------------------------------------------------------------------------------------------------------------
<S>                                             <C>        <C>        <C>        <C>        <C>            <C>  
Janus Aspen Growth Portfolio                    0.78%      0.83%      0.98%      1.23%      2.16%          1.28%
- ---------------------------------------------------------------------------------------------------------------------
Janus Aspen Aggressive Growth Portfolio         0.78%      0.83%      0.93%      1.14%      5.79%          1.34%
- ---------------------------------------------------------------------------------------------------------------------
Janus Aspen Capital Appreciation Portfolio      2.19%        N/A        N/A        N/A        N/A          2.66%
- ---------------------------------------------------------------------------------------------------------------------
Janus Aspen International Growth Portfolio      1.08%      2.21%      3.57%      4.67%        N/A          1.57%
- ---------------------------------------------------------------------------------------------------------------------
Janus Aspen Worldwide Growth Portfolio          0.81%      0.91%      1.09%      1.49%      2.71%          1.32%
- ---------------------------------------------------------------------------------------------------------------------
Janus Aspen Balanced Portfolio                  0.83%      1.07%      1.55%      1.74%      7.92%          1.33%
- ---------------------------------------------------------------------------------------------------------------------
Janus Aspen Equity Income Portfolio             5.75%        N/A        N/A        N/A        N/A          6.19%
- ---------------------------------------------------------------------------------------------------------------------
Janus Aspen Flexible Income Portfolio           0.75%      0.84%      1.07%      1.35%      5.27%          1.23%
- ---------------------------------------------------------------------------------------------------------------------
Janus Aspen High-Yield Portfolio                3.27%      6.29%        N/A        N/A        N/A          3.42%
- ---------------------------------------------------------------------------------------------------------------------
Janus Aspen Short-Term Bond Portfolio           0.91%      0.84%      1.37%      1.40%      5.33%          1.49%
- ---------------------------------------------------------------------------------------------------------------------
Janus Aspen Money Market Portfolio              0.55%      0.78%      1.07%        N/A        N/A          1.10%
- ---------------------------------------------------------------------------------------------------------------------
</TABLE>

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

                       REPORT OF INDEPENDENT ACCOUNTANTS

To the Trustees and Shareholders
of Janus Aspen Series

In our opinion, the accompanying statements of assets and liabilities, including
the schedules of  investments,  and the related  statements of operations and of
changes  in net assets  and the  financial  highlights  present  fairly,  in all
material respects, the financial position of Janus Aspen Growth Portfolio, Janus
Aspen Aggressive Growth Portfolio,  Janus Aspen Capital Appreciation  Portfolio,
Janus  Aspen  International  Growth  Portfolio,  Janus  Aspen  Worldwide  Growth
Portfolio,  Janus Aspen Balanced Portfolio, Janus Aspen Equity Income Portfolio,
Janus Aspen Flexible Income Portfolio,  Janus Aspen High-Yield Portfolio,  Janus
Aspen   Short-Term  Bond  Portfolio  and  Janus  Aspen  Money  Market  Portfolio
(constituting the Janus Aspen Series, hereafter referred to as the "Portfolios")
at December 31, 1997,  the results of each of their  operations,  the changes in
each of their net assets and the  financial  highlights  for each of the periods
indicated,  in conformity with generally accepted accounting  principles.  These
financial  statements  and  financial  highlights   (hereafter  referred  to  as
"financial  statements") are the  responsibility of the Portfolios'  management;
our responsibility is to express an opinion on these financial  statements based
on our  audits.  We  conducted  our  audits  of these  financial  statements  in
accordance with generally accepted auditing standards which require that we plan
and perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement.  An audit includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements,  assessing the accounting  principles used and significant estimates
made by management, and evaluating the overall financial statement presentation.
We believe  that our  audits,  which  included  confirmation  of  securities  at
December  31,  1997 by  correspondence  with the  custodian  and brokers and the
application of alternative  auditing  procedures where securities  purchased had
not been received, provide a reasonable basis for the opinion expressed above.

Price Waterhouse LLP

/s/ Price Waterhouse LLP

Denver, Colorado
February 2, 1998

           JANUS ASPEN SERIES     DECEMBER 31, 1997     ANNUAL REPORT
<PAGE>

                                  [Logo] JANUS

                                P.O. Box 173375
                             Denver, CO 80217-3375
                                 1-800-504-4440


1/98  Retirement Shares distributed by Janus Distributors, Inc. Member NASD



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