JANUS ASPEN SERIES
N-30D, 2000-02-25
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Janus | Aspen Series

1999 ANNUAL REPORT

     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 Growth and Income Portfolio

     Janus Aspen Flexible Income Portfolio

     Janus Aspen High-Yield Portfolio

     Janus Aspen Money Market Portfolio

Janus logo goes here

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Table | of Contents

     JANUS ASPEN SERIES

     Portfolio Managers' Commentaries and Schedules of Investments

         Growth Portfolio ........................................     1

         Aggressive Growth Portfolio .............................     5

         Capital Appreciation Portfolio ..........................     8

         International Growth Portfolio ..........................    11

         Worldwide Growth Portfolio ..............................    16

         Balanced Portfolio ......................................    21

         Equity Income Portfolio .................................    26

         Growth and Income Portfolio .............................    30

         Flexible Income Portfolio ...............................    34

         High-Yield Portfolio ....................................    39

         Money Market Portfolio ..................................    42

     Statements of Operations ....................................    44

     Statements of Assets & Liabilities ..........................    46

     Statements of Changes in Net Assets .........................    48

     Financial Highlights ........................................    51

     Notes to the Schedules of Investments .......................    60

     Notes to Financial Statements ...............................    61

     Explanation of Charts, Tables
       and Financial Statements ..................................    66

     Report of Independent Accountants ...........................    69

                                                            Janus logo goes here

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                                                  Janus | Aspen Growth Portfolio

[PHOTO]
James Craig
portfolio manager

For the fiscal  year ended  December  31,  1999,  Janus Aspen  Growth  Portfolio
returned  43.98% for its  Institutional  Shares  and  44.12% for its  Retirement
Shares. This compares with a 21.03% return posted by its benchmark,  the S&P 500
Index.(1)

While  the  Fund's  substantial  gains  can  be  attributed  to our  success  in
identifying stocks that work in any economic environment,  I believe these gains
also somewhat reflect an unusual reporting period. For example, consider that at
the start of the year,  the markets  had only just begun to recover  from severe
repercussions  of the Russian debt debacle and ensuing  worldwide  credit crunch
that unfolded in 1998.  However,  signs of improvement in Japan and other global
economies  encouraged  investors,  and equities  gained  momentum.  Fueling this
recovery was a rapidly expanding U.S. economy and robust corporate earnings that
later carried a number of stocks to record highs.

Despite  the  absence  of  inflation,  aided  in part  by  ongoing  advances  in
technology,  the economy's torrid growth rate led to a general  uneasiness among
investors,  convincing them that higher prices could be right around the corner.
The Federal  Reserve  responded to these concerns by making three  quarter-point
interest-rate  hikes in an effort to keep inflation at bay.  Because these moves
were widely  anticipated,  they had already been  factored into stock prices and
therefore had minimal impact on the market.

Although we're mindful of macroeconomic  events,  our focus remains on investing
in dynamic,  visionary businesses that are contributing to the overall growth of
the economy. By virtue of this strategy, the Portfolio's largest weightings were
in the technology, cable and telecommunications groups.

Simply put, technology stocks were on a tear,  responding to the rapid growth of
the  Internet.   More  and  more  businesses  are  relying  on  Internet-related
technologies to increase production and decrease costs, and those on the cutting
edge of development,  such as Sun  Microsystems  and Cisco Systems,  continue to
benefit.  Sun's intense focus on optimizing  computer systems for e-commerce has
enabled it to leapfrog its competition. Meanwhile, Cisco has gained a reputation
as the integrated voice,  video and data network enabler of choice.  Both stocks
performed well for the Portfolio.

Other  standouts  included  semiconductor  companies Texas  Instruments,  Linear
Technology and Maxim Integrated Products, all of which contributed significantly
to our strong results. Advanced technologies and products developed by all three
are enabling the  miniaturization  of devices such as computers,  camcorders and
wireless  phones,  while also making it  possible to transmit  data and voice at
faster speeds.

Within  the  Portfolio's   cable  group,   solid  performers   included  Comcast
Corporation  and Cox  Communications.  These  companies are  delivering on their
promise  to  transmit a variety of new,  value-added  services  through a single
cable platform. Soon, subscribers will be able to shop on the Internet,  receive
live feeds from national  sporting  events and choose from hundreds of channels,
all through their cable connection.

Telecommunications  was  another  area that took off  during  the period and our
holdings in Nokia and Lucent  Technologies,  a newer  position in the Portfolio,
gained  substantially.  Wireless handset manufacturer Nokia continued to benefit
from tremendous worldwide subscriber growth, which increased by more than 50% in
1999.  Meanwhile,  Lucent  has  become a market  leader  in  optical  networking
equipment.

Despite these successes,  a few of our holdings proved  disappointing.  One such
disappointment was Tyco International,  a diversified manufacturing company that
suffered from negative press regarding alleged accounting irregularities.  While
our in-depth analysis of Tyco shows its accounting  practices remain stellar, we
opted to trim this position and redeploy those assets in other,  more compelling
opportunities.

Looking ahead,  it's unclear  whether  additional rate hikes may be necessary to
keep a lid on inflation.  The mere prospect of further rate increases could lead
to near-term volatility in the markets. Nonetheless, we believe that most stocks
have already discounted this fear and that the high-growth companies we focus on
will continue to perform well.

In closing,  I'd like to comment on my recent  decision to hand full  management
responsibilities  of  Janus  Aspen  Growth  Portfolio  over to  Blaine  Rollins.
Blaine's  track record as portfolio  manager of Janus Aspen  Balanced and Equity
Income  Portfolios says a lot about his stock-picking  abilities.  Having worked
for many years as assistant  portfolio  manager of Janus Fund, Blaine has proven
he's more than qualified for this new responsibility. Meanwhile, I'll be serving
as Janus' chief  investment  officer and director of research,  where I can more
directly  impact  performance  for all our  shareholders.  It's been a  pleasure
working  on your  behalf,  and,  as  always,  I thank  you  for  your  continued
investment in Janus Aspen Growth Portfolio.

Portfolio Asset Mix              December 31, 1999        December 31, 1998
- --------------------------------------------------------------------------------
Equities                                     89.4%                    93.2%
  Foreign                                     9.5%                     4.9%
  Europe                                      6.0%                     3.6%
Top 10 Equities (% of Assets)                33.0%                    36.5%
Number of Stocks                                75                       70
Cash, Cash Equivalents
  & Fixed-Income Securities                  10.6%                     6.8%
- --------------------------------------------------------------------------------

(1)  All returns include reinvested dividends.

Past performance does not guarantee future results.

                                       Janus Aspen Series / December 31, 1999  1
<PAGE>

Average Annual Total Return(1)
For the Periods Ended December 31, 1999
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 9/13/93)
  1 Year                                                     43.98%
  5 Year                                                     29.89%
  From Inception                                             24.28%
- --------------------------------------------------------------------------------
S&P 500 Index
  1 Year                                                     21.03%
  5 Year                                                     28.54%
  From Inception Date of Institutional Shares                22.68%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                     44.12%
  5 Year                                                     29.25%
  From Portfolio Inception                                   23.49%
- --------------------------------------------------------------------------------
Returns shown for  Retirement  Shares for periods  prior to their  inception are
derived from the historical  performance of  Institutional  Shares,  adjusted to
reflect the higher operating expenses of Retirement Shares.

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)

Average Annual Total Return
for the periods ended December 31, 1999
One Year, 43.98%
Five Year, 29.89%
Since 9/13/93,* 24.28%

[GRAPHIC OMITTED]

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 shaded
area of green.  The S&P 500 Index is  represented by a solid 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, 1999. The upper
right quadrant reflects the ending value of the hypothetical investment in Janus
Aspen Growth  Portfolio - Institutional  Shares ($39,330) as compared to the S&P
500 Index ($36,243).

Janus Aspen Growth Portfolio
- - Institutional Shares - $39,330

S&P 500 Index - $36,243

*The Portfolio's inception date.
Source - Lipper, Inc. 1999.

(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  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 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. Past performance does not guarantee future results.

SCHEDULE OF INVESTMENTS

Shares or Principal Amount                                          Market Value
================================================================================
Common Stock - 89.4%
Audio and Video Products - 0.4%
     168,800    Gemstar International Group, Ltd.* ...........    $   12,027,000

Automotive - Truck Parts and Equipment - 0.1%
      78,830    Federal-Mogul Corp. ..........................         1,586,454

Brewery - 0.4%
     170,900    Anheuser-Busch Companies, Inc. ...............        12,112,537

Broadcast Services and Programming - 3.5%
   1,226,305    AT&T Corp./Liberty Media Group - Class A* ....        69,592,809
     403,980    Clear Channel Communications, Inc.* ..........        36,055,215

                                                                     105,648,024

Cable Television - 8.5%

     276,640    Adelphia Communications Corp. - Class A* .....        18,154,500
     273,475    Charter Communications, Inc. - Class A* ......         5,982,266
   2,865,755    Comcast Corp. - Special Class A ..............       144,004,189
   1,205,743    Cox Communications, Inc. - Class A* ..........        62,095,765
   4,429,099    Telewest Communications PLC*,** ..............        23,596,002

                                                                     253,832,722

Cellular Telecommunications - 5.1%
     467,545    Nextel Communications, Inc. - Class A* .......        48,215,578
         910    NTT Mobile Communications
                  Network, Inc.** ............................        35,000,000
      80,265    Omnipoint Corp.* .............................         9,681,966
     136,190    Sprint Corp./PCS Group* ......................        13,959,475
     270,590    VoiceStream Wireless Corp.* ..................        38,508,339
     100,000    WinStar Communications, Inc.* ................         7,487,500

                                                                     152,852,858

Circuits - 4.0%
     781,400    Linear Technology Corp. ......................    $   55,918,937
   1,383,400    Maxim Integrated Products, Inc.* .............        65,279,187

                                                                     121,198,124

Commercial Banks - 0.3%
      19,475    M&T Bank Corp. ...............................         8,067,519

Commercial Services - 1.0%
     753,775    Paychex, Inc. ................................        30,151,000

Computer Software - 1.9%
     475,960    Microsoft Corp.* .............................        55,568,330

Computers - Memory Devices - 1.0%
     287,555    EMC Corp.* ...................................        31,415,384

Computers - Micro - 5.3%
     214,855    Apple Computer, Inc.* ........................        22,089,780
     594,435    Dell Computer Corp.* .........................        30,316,185
   1,365,810    Sun Microsystems, Inc.* ......................       105,764,912

                                                                     158,170,877

Cosmetics and Toiletries - 0.4%
     182,845    Colgate-Palmolive Co. ........................        11,884,925

Cruise Lines - 0.7%
     199,355    Carnival Corp. ...............................         9,531,661
     226,520    Royal Caribbean Cruises, Ltd. ................        11,170,268

                                                                      20,701,929

Data Processing and Management - 1.2%
     688,715    Automatic Data Processing, Inc. ..............        37,104,521

Distribution and Wholesale - 0.8%
     271,685    Costco Wholesale Corp.* ......................        24,791,256

See Notes to Schedules of Investments.

2  Janus Aspen Series / December 31, 1999
<PAGE>

                                                  Janus | Aspen Growth Portfolio

SCHEDULE OF INVESTMENTS (continued)

Shares or Principal Amount                                          Market Value
================================================================================
Diversified Financial Services - 0.7%
     405,000    Citigroup, Inc. ..............................    $   22,502,813

Diversified Operations - 5.5%
     618,785    General Electric Co. .........................        95,756,979
   1,799,658    Tyco International, Ltd. .....................        69,961,705

                                                                     165,718,684

Electronic Components - Semiconductors - 2.7%
     110,710    Conexant Systems, Inc.* ......................         7,348,376
     746,925    Texas Instruments, Inc. ......................        72,358,359

                                                                      79,706,735

Electronic Safety Devices - 0.2%
     141,350    Pittway Corp. - Class A ......................         6,334,247

Enterprise Software and Services - 0.8%
     133,530    BEA Systems, Inc.* ...........................         9,338,754
      79,075    i2 Technologies, Inc.* .......................        15,419,625

                                                                      24,758,379

Finance - Credit Card - 2.1%
     374,215    American Express Co. .........................        62,213,244

Finance - Investment Bankers/Brokers - 1.4%
   1,096,740    Charles Schwab Corp. .........................        42,087,398

Food - Wholesale - 0.1%
     197,450    U.S. Foodservice* ............................         3,307,287

Identification Systems and Devices - 0.4%
     177,000    Symbol Technologies, Inc. ....................        11,250,562

Instruments - Scientific - 1.4%
     975,570    Dionex Corp.* ................................        40,181,289
      17,495    PE Corp./PE Biosystems Group .................         2,104,867

                                                                      42,286,156

Internet Content - 0.4%
      53,850    Network Solutions, Inc.* .....................        11,715,741

Internet Software - 1.3%
     499,190    America Online, Inc.* ........................        37,657,646

Life and Health Insurance - 2.4%
   2,273,077    Prudential PLC** .............................        44,791,982
   1,084,560    StanCorp Financial Group, Inc. ...............        27,317,355

                                                                      72,109,337

Medical - Biomedical and Genetic - 1.5%
     342,800    Genentech, Inc.* .............................        46,106,600

Medical - Drugs - 0.7%
     505,815    Schering-Plough Corp. ........................        21,339,070

Medical Instruments - 0.3%
     277,270    Medtronic, Inc. ..............................        10,103,026

Money Center Banks - 2.4%
   1,821,560    Bank of New York Company, Inc. ...............        72,862,400

Multi-Line Insurance - 1.3%
     358,541    American International Group, Inc. ...........        38,767,246

Multimedia - 6.4%
   1,759,461    Time Warner, Inc. ............................       127,450,956
   1,060,400    Viacom, Inc. - Class B* ......................        64,087,925

                                                                     191,538,881

Networking Products - 3.9%
   1,094,409    Cisco Systems, Inc.* .........................    $  117,238,564

Office Automation and Equipment - 0.4%
     235,775    Pitney Bowes, Inc. ...........................        11,390,880

Optical Supplies - 0.5%
     321,435    Allergan, Inc. ...............................        15,991,391

Pipelines - 2.4%
   1,630,690    Enron Corp. ..................................        72,361,869

Property and Casualty Insurance - 0.2%
      99,795    Progressive Corp. ............................         7,297,509

Publishing - Newspapers - 0.3%
     177,035    New York Times Co. - Class A .................         8,696,844

Radio - 0.9%
      24,565    Hispanic Broadcasting Corp. ..................         2,265,354
     701,765    Infinity Broadcasting Corp. - Class A* .......        25,395,121

                                                                      27,660,475

Retail - Building Products - 1.2%
     522,435    Home Depot, Inc. .............................        35,819,450

Retail - Discount - 0.4%
     161,320    Wal-Mart Stores, Inc. ........................        11,151,245

Retail - Office Supplies - 0.7%
   1,005,320    Staples, Inc.* ...............................        20,860,390

Retail - Restaurants - 2.5%
   1,876,175    McDonald's Corp. .............................        75,633,305

Super-Regional Banks - 0.4%
     215,610    Northern Trust Corp. .........................        11,427,330

Telecommunication Equipment - 6.0%
   1,114,195    Lucent Technologies, Inc. ....................        83,355,713
      69,003    Nokia Oyj ....................................        12,495,063
     447,273    Nokia Oyj (ADR) ..............................        84,981,870

                                                                     180,832,646

Telecommunication Services - 1.1%
     125,000    Adelphia Business Solutions, Inc.* ...........         6,000,000
     204,906    NTL, Inc.* ...................................        25,562,024

                                                                      31,562,024

Telephone - Integrated - 0.5%
     621,401    Telefonica S.A.* .............................        15,503,209

Television - 1.4%
     410,385    Univision Communications, Inc. - Class A* ....        41,936,217
- --------------------------------------------------------------------------------
Total Common Stock (cost $1,782,207,611) .....................     2,684,842,260
- --------------------------------------------------------------------------------
Corporate Bonds - 0.9%
Retail - Internet - 0.4%
$ 11,509,000    Amazon.com, Inc., 4.75%
                  convertible subordinated debentures
                  due 2/1/09+ ................................        13,019,556

Telecommunication Services - 0.5%
  14,000,000    NTL, Inc., 5.75%
                  convertible subordinated notes
                  due 12/15/09+ ..............................        15,050,000
- --------------------------------------------------------------------------------
Total Corporate Bonds (cost $26,651,735) .....................        28,069,556
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

                                       Janus Aspen Series / December 31, 1999  3
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Janus | Aspen Growth Portfolio

SCHEDULE OF INVESTMENTS (continued)

Shares or Principal Amount                                          Market Value
================================================================================
Repurchase Agreement - 7.3%
$217,600,000    Deutsche Bank Securities, Inc., 4.55%
                  dated 12/31/99, maturing 1/3/00, to be
                  repurchased at $217,682,507 collateralized
                  by $56,882,283 in Fannie Mae, 4.005%-
                  7.00%, 11/18/15-5/25/29; $238,537,679
                  in Freddie Mac, 0%-7.3262%, 12/15/12-
                  4/1/29; with respective values of
                  $41,215,960 and $180,736,040
                  (cost $217,600,000) ........................    $  217,600,000
- --------------------------------------------------------------------------------
U.S. Government Agencies - 2.5%
                Fannie Mae:
  50,000,000      5.625%, 1/21/00 ............................        49,848,333
  25,000,000      5.60%, 5/3/00 ..............................        24,512,222
- --------------------------------------------------------------------------------
Total U.S. Government Agencies (cost $74,370,000) ............        74,360,555
- --------------------------------------------------------------------------------
Total Investments (total cost $2,100,829,346) - 100.1% .......     3,004,872,371
- --------------------------------------------------------------------------------
Liabilities, net of Cash, Receivables and Other Assets - (0.1%)      (2,889,168)
- --------------------------------------------------------------------------------
Net Assets - 100% ............................................    $3,001,983,203
- --------------------------------------------------------------------------------

Summary of Investments by Country, December 31, 1999

Country                        % of Investment Securities          Market Value
- --------------------------------------------------------------------------------
Bermuda                                    2.3%                   $   69,961,705
Finland                                    3.2%                       97,476,933
Spain                                      0.5%                       15,503,209
United Kingdom                             2.3%                       68,387,984
Japan                                      1.2%                       35,000,000
United States++                           90.5%                    2,718,542,540
- --------------------------------------------------------------------------------
Total                                    100.0%                   $3,004,872,371

++Includes Short-Term Securities (80.8% excluding Short-Term Securities)

Forward Currency Contracts, Open at December 31, 1999

Currency Sold and                  Currency            Currency       Unrealized
Settlement Date                  Units Sold     Value in $ U.S.      Gain/(Loss)
- --------------------------------------------------------------------------------
British Pound 4/7/00             18,000,000       $  29,115,000      $   149,424
British Pound 4/20/00             1,200,000           1,941,000            7,512
Japanese Yen 3/16/00             45,000,000             445,799            3,316
- --------------------------------------------------------------------------------
Total                                             $  31,501,799      $   160,252

See Notes to Schedules of Investments.

4  Janus Aspen Series / December 31, 1999
<PAGE>

                                       Janus | Aspen Aggressive Growth Portfolio

[PHOTO]
James Goff
portfolio manager

I'm pleased to report that for the fiscal year ended  December 31,  1999,  Janus
Aspen Aggressive  Growth Portfolio gained 125.40% for its  Institutional  Shares
and 124.34% for its Retirement  Shares, our best performance ever. These returns
outpaced our benchmark index, the S&P MidCap 400, which  appreciated  14.72%.(1)
The  Portfolio  also earned a top-decile  ranking,  placing 3rd out of 71 midcap
portfolios tracked by Lipper, Inc., a leading mutual fund rating company.(2)

This strong performance can be attributed to a couple of factors. First, I can't
talk about these  results  without  also  mentioning  our  outstanding  group of
research  analysts.  The  idea  generation  and  execution  on the part of these
talented  individuals  was nothing  short of  tremendous.  Without a doubt,  our
investors  have  them to thank for the very  gratifying  success  we've  shared.
Second, after a sustained period of large-company dominance,  small- and mid-cap
stocks advanced vigorously, fueled primarily by a U.S. economy that continued to
steam ahead despite three  interest-rate  hikes intended to slow growth and head
off inflation.

Even though the equity market produced  record-breaking  gains,  success was not
easy to come by.  While  the  market  broadened,  it was  narrow in terms of the
industries it favored.  Against this  backdrop,  our  investments in technology,
specifically  in  fiber-optics,   data  storage  and  management,  and  wireless
telecommunications,  paid off handsomely.  But no matter what the industry,  our
focus,  as always,  is on companies  with rapid  growth (in excess of 20%),  few
competitors and high barriers to entry.

That said,  innovations  in  technology  continue to produce  fertile  fields of
growth by creating many  exciting  investment  opportunities.  A good example is
photonics,   which  utilizes  a  new  technology   called  Dense  Wave  Division
Multiplexing  (DWDM) that allows increased data, video and voice  information to
be carried over existing fiber-optic lines.  Essentially,  DWDM can create up to
100  channels,  where before there was only one, by enabling  data traffic to be
sent over different  wavelengths of light.  As the amount of data being produced
and  transmitted  grows  every  day,  many  businesses  will  need to  invest in
photonics  equipment to expand the capacity of their current networks.  As such,
SDL and E-Tek Dynamics,  two newer holdings that specialize in photonics,  stand
to benefit. In fact, these companies have already made significant contributions
to the Portfolio.

The  Internet  is  driving  much of the  growth in data  traffic  today.  Exodus
Communications, VeriSign and VERITAS Software have clearly been beneficiaries of
that growth, all posting  triple-digit  returns.  Hands down our best stock this
year,  Exodus has nationwide  data centers that allow  companies to economically
and reliably  maintain their  corporate Web sites. A different spin on security,
VeriSign,  the leader in electronic  encryption  services,  makes  products that
safeguard  online  activities  such as e-mail,  home  banking  and  credit  card
purchases.  Moreover,  the  company  recently  announced  plans to  apply  these
technologies to the wireless world, increasing its appeal. VERITAS, another play
on data security, markets storage solutions that help clients manage and protect
their network data.  Individually  and as a group,  these  holdings  spurred the
Portfolio higher and are poised to do so in the future.

Wireless communications is another area with unlimited potential. Research shows
that cellular usage in the U.S. is rapidly accelerating,  with further growth on
the horizon.  Not only that,  the industry is  benefiting  from the emergence of
wireless data networks,  which will let users access the Internet from anywhere.
Capitalizing on this powerful trend, we substantially  increased our holdings in
this group, adding Western Wireless,  VoiceStream Wireless and Omnipoint,  among
others.  All of these companies  significantly  boosted  performance,  and we're
extremely confident about their prospects going forward.

While our disappointments were few, long-time holding Apollo Group proved a drag
on performance.  Despite record earnings,  Apollo, which operates the University
of Phoenix, fell after Wall Street downgraded the stock based on a traditionally
weak  upcoming  quarter.  Although we remain  optimistic  about Apollo given the
increasing demand for adult education programs, we elected to trim the position.
CheckFree Holdings, a specialist in electronic bill payment,  also declined when
several customers formed a joint venture to provide the same service. Therefore,
we sold CheckFree at a loss, redeploying our assets in other areas.

Looking ahead, we expect the market to remain volatile amid the threat of rising
interest rates. However, as we've said in the past, we don't have a crystal ball
and can't predict  where the market is heading.  Rather than spend time worrying
about  factors  that are outside our  control,  we'll keep our eye firmly on the
ball.  By  uncovering  an  information  edge,  we  gain  significant  advantage,
bolstering our confidence in each and every company in the Portfolio.

Thank you for investing in Janus Aspen Aggressive Growth Portfolio.

Portfolio Asset Mix              December 31, 1999        December 31, 1998
- --------------------------------------------------------------------------------
Equities                                     97.8%                    95.6%
  Foreign                                     3.9%                     9.7%
Number of Stocks                                70                       50
Top 10 Equities (% of Assets)                31.9%                    47.4%
Cash & Cash Equivalents                       2.2%                     4.4%
- --------------------------------------------------------------------------------

(1)  All returns include reinvested dividends.

(2)  Lipper,  Inc. defines a midcap portfolio as "a portfolio that by prospectus
     or  portfolio   practice   invests   primarily  in  companies  with  market
     capitalizations  less  than $5  billion  at the  time of  purchase."  As of
     December 31, 1999, Janus Aspen Aggressive  Growth Portfolio ranked 1/21 for
     the 5-year  period.  The ranking is for  Institutional  Shares and based on
     total return, including reinvestment of dividends and capital gains for the
     stated period.

Past performance does not guarantee future results.

                                       Janus Aspen Series / December 31, 1999  5
<PAGE>

Average Annual Total Return(1)
For the Periods Ended December 31, 1999
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 9/13/93)
  1 Year                                                    125.40%
  5 Year                                                     36.23%
  From Inception                                             34.42%
- --------------------------------------------------------------------------------
S&P MidCap 400 Index
  1 Year                                                     14.72%
  5 Year                                                     23.05%
  From Inception Date of Institutional Shares                18.08%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                    124.34%
  5 Year                                                     35.47%
  From Portfolio Inception                                   33.53%
- --------------------------------------------------------------------------------
Returns shown for  Retirement  Shares for periods  prior to their  inception are
derived from the historical  performance of  Institutional  Shares,  adjusted to
reflect the higher operating expenses of Retirement Shares.

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)

Average Annual Total Return
for the periods ended December 31, 1999
One Year, 125.40%
Five Year, 36.23%
Since 9/13/93,* 34.42%

[GRAPHIC OMITTED]

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  shaded  area  of  green.  The S&P  MidCap  400  Index  is
represented  by a solid  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,  1999.  The upper and lower  right
quadrants reflect the ending value of the hypothetical investment in Janus Aspen
Aggressive Growth Portfolio - Institutional  Shares ($64,435) as compared to the
S&P MidCap 400 Index ($28,492).

Janus Aspen Aggressive Growth Portfolio
- - Institutional Shares - $64,435

S&P MidCap 400 Index - $28,492

*The Portfolio's inception date.
Source - Lipper, Inc. 1999.

(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  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 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. Past performance does not guarantee future results.

SCHEDULE OF INVESTMENTS

Shares or Principal Amount                                          Market Value
================================================================================
Common Stock - 97.8%
Advertising Sales - 1.4%
     761,060    Lamar Advertising Co.* .......................    $   46,091,696

Advertising Services - 2.6%
     626,315    TMP Worldwide, Inc.* .........................        88,936,730

Audio and Video Products - 2.4%
   1,137,500    Gemstar International Group, Ltd.* ...........        81,046,875

Broadcast Services and Programming - 0.9%
     327,111    Clear Channel Communications, Inc.* ..........        29,194,657

Cellular Telecommunications - 12.0%
   2,793,130    Crown Castle International Corp.* ............        89,729,301
     469,355    Omnipoint Corp.* .............................        56,615,946
     366,570    Powertel, Inc.* ..............................        36,794,464
     694,870    Rogers Cantel Mobile Communications, Inc. ....
                  - Class B* .................................        25,275,896
     405,125    United States Cellular Corp.* ................        40,892,304
     396,270    VoiceStream Wireless Corp.* ..................        56,394,174
   1,469,990    Western Wireless Corp. - Class A* ............        98,121,832

                                                                     403,823,917

Circuits - 2.7%
   1,761,985    Vitesse Semiconductor Corp.* .................        92,394,088

Commercial Services - 3.5%
   2,939,992    Paychex, Inc. ................................       117,599,680

Computer Data Security - 3.9%
     685,175    VeriSign, Inc.* ..............................       130,825,602

Computer Services - 0.9%
     186,655    Safeguard Scientifics, Inc.* .................        30,249,776

Computer Software - 0.5%
      46,905    VA Linux Systems, Inc.* ......................    $    9,691,746
      23,540    Vitria Technology, Inc.* .....................         5,508,360

                                                                      15,200,106

Computers - Integrated Systems - 0.6%
     109,685    Brocade Communications Systems, Inc.* ........        19,414,245

Computers - Memory Devices - 2.6%
      70,050    Silicon Storage Technology, Inc.* ............         2,889,562
     599,830    VERITAS Software Corp.* ......................        85,850,669

                                                                      88,740,231

Electronic Components - Semiconductors - 8.0%
     250,540    Atmel Corp.* .................................         7,406,589
     604,575    SDL, Inc.* ...................................       131,797,350
     584,995    TriQuint Semiconductor, Inc.* ................        65,080,694
   1,425,800    Xilinx, Inc.* ................................        64,829,344

                                                                     269,113,977

Fiber Optics - 5.7%
     646,470    E-Tek Dynamics, Inc.* ........................        87,031,024
   2,177,895    Metromedia Fiber Network, Inc. - Class A* ....       104,402,842

                                                                     191,433,866

Internet Content - 4.9%
     375,425    DoubleClick, Inc.* ...........................        95,005,989
      45,020    InfoSpace.com, Inc.* .........................         9,634,280
      65,435    Internet Capital Group, Inc.* ................        11,123,950
     230,840    Network Solutions, Inc.* .....................        50,222,127

                                                                     165,986,346

See Notes to Schedules of Investments.

6  Janus Aspen Series / December 31, 1999
<PAGE>

                                       Janus | Aspen Aggressive Growth Portfolio

SCHEDULE OF INVESTMENTS (continued)

Shares or Principal Amount                                          Market Value
================================================================================
Internet Software - 9.7%
     125,475    Clarent Corp.* ...............................    $    9,755,681
     318,150    EarthLink Network, Inc.* .....................        13,521,375
   1,188,450    Exodus Communications, Inc.* .................       105,549,216
     216,145    Liberate Technologies, Inc.* .................        55,549,265
     139,265    Phone.com, Inc.* .............................        16,146,036
      70,050    Portal Software, Inc.* .......................         7,206,394
   1,039,455    PSINet, Inc.* ................................        64,186,346
     298,115    Software.com, Inc.* ..........................        28,619,040
     166,105    Vignette Corp.* ..............................        27,075,115

                                                                     327,608,468

Medical - Drugs - 4.7%
     560,730    King Pharmaceuticals, Inc.* ..................        31,435,926
     433,645    MedImmune, Inc.* .............................        71,930,864
     569,615    Sepracor, Inc.* ..............................        56,498,688

                                                                     159,865,478

Medical Information Systems - 0.7%
     659,965    Healtheon/WebMD Corp.* .......................        24,748,687

Medical Products - 0.7%
     343,610    MiniMed, Inc.* ...............................        25,169,432

Music/Clubs - 1.6%
    1,449,22    SFX Entertainment, Inc.* .....................        52,443,721

Radio - 7.5%
     596,495    AMFM, Inc.* ..................................        46,675,734
     560,170    Citadel Communications Corp.* ................        36,341,029
      97,240    Cox Radio, Inc. - Class A* ...................         9,699,690
     757,720    Entercom Communications Corp.* ...............        50,009,520
     933,155    Hispanic Broadcasting Corp.* .................        86,054,388
     245,665    Radio One, Inc.* .............................        22,601,180

                                                                     251,381,541

Resorts and Theme Parks - 1.0%
   1,132,050    Premier Parks, Inc.* .........................        32,687,944

Retail - Internet - 2.3%
     298,680    Amazon.com, Inc.* ............................        22,737,015
     419,475    eBay, Inc.* ..................................        52,513,027
       9,870    FreeMarkets, Inc.* ...........................         3,368,754

                                                                      78,618,796

Retail - Restaurants - 0.1%
     152,488    PizzaExpress PLC .............................         1,804,137

Schools - 1.7%
   2,844,096    Apollo Group, Inc. - Class A* ................        57,059,676
      69,705    Edison Schools, Inc.* ........................         1,097,854

                                                                      58,157,530

Telecommunication Services - 10.9%
   1,194,435    AT&T Canada, Inc.* ...........................        48,076,009
   1,130,580    Clearnet Communications, Inc. - Class A* .....        38,863,687
     658,445    Level 3 Communications, Inc.* ................        53,910,184
   1,832,930    McLeodUSA, Inc. - Class A* ...................       107,913,754
     555,387    Microcell Telecommunications, Inc.* ..........        18,258,348
     502,595    Net2Phone, Inc.* .............................        23,087,958
     607,251    NTL, Inc.* ...................................        75,754,562

                                                                     365,864,502

Telephone - Integrated - 1.8%
     741,355    NEXTLINK Communications, Inc. - Class A* .....        61,578,800

Television - 0.9%
     289,438    Univision Communications, Inc. - Class A* ....    $   29,576,946

Wire and Cable Products - 0.0%
      12,000    Furukawa Electric Co., Ltd. ..................           182,032

Wireless Equipment - 1.6%
     685,760    American Tower Corp.* ........................        20,958,540
     487,590    RF Micro Devices, Inc.* ......................        33,369,441

                                                                      54,327,981
- --------------------------------------------------------------------------------
Total Common Stock (cost $1,898,140,287) .....................     3,294,067,787
- --------------------------------------------------------------------------------
Repurchase Agreement - 2.4%
$ 79,800,000    Deutsche Bank Securities, Inc., 4.55%
                  dated 12/31/99, maturing 1/3/00, to be
                  repurchased at $79,830,258 collateralized
                  by $20,860,323 in Fannie Mae, 4.005%-
                  7.00%, 11/18/15-5/25/29; $87,478,432
                  in Freddie Mac, 0%-7.3262%, 12/15/12-
                  4/1/29; with respective values of
                  $15,115,044 and $66,280,956
                  (cost $79,800,000) .........................        79,800,000
- --------------------------------------------------------------------------------
Total Investments (total cost $1,977,940,287) - 100.2% .......     3,373,867,787
- --------------------------------------------------------------------------------
Liabilities, net of Cash, Receivables and Other Assets - (0.2%)      (6,320,798)
- --------------------------------------------------------------------------------
Net Assets - 100% ............................................    $3,367,546,989
- --------------------------------------------------------------------------------

Summary of Investments by Country, December 31, 1999

Country                        % of Investment Securities          Market Value
- --------------------------------------------------------------------------------
Canada                                     3.9%                   $  130,473,940
Japan                                       --                           182,032
United Kingdom                              --                         1,804,137
United States++                           96.1%                    3,241,407,678
- --------------------------------------------------------------------------------
Total                                    100.0%                   $3,373,867,787

++Includes Short-Term Securities (93.7% excluding Short-Term Securities)

See Notes to Schedules of Investments.

                                       Janus Aspen Series / December 31, 1999  7
<PAGE>

Janus | Aspen Capital Appreciation Portfolio

[PHOTO]
Scott Schoelzel
portfolio manager

First and foremost I would like to thank each of you for your continued  support
and confidence.  Janus Aspen Capital  Appreciation  Portfolio had another strong
year, gaining 67.00% for its Institutional  Shares and 66.16% for its Retirement
Shares. This compares with a 21.03% return posted by the S&P 500 Index.(1) These
strong results earned the Portfolio a top-decile ranking, placing it 11th out of
182 growth  portfolios  tracked by Lipper,  Inc.,  a leading  mutual fund rating
company.(2)

In last  year's  letter,  I  suggested  that  investors  begin  to  reset  their
expectations  with respect to the types of returns  they should  expect from the
stock market.  This is where we will begin this year's  letter.  Annual gains of
50%, 60% or 70% are complete aberrations. While no one is more enthusiastic than
I am about prospects for the "new economy" and the profound effects it will have
on the way we live,  learn and work,  let's get real.  The returns we've enjoyed
these past few years just aren't sustainable. To put things in perspective,  the
historical  annual  average return for the market is about 11%. But a compounded
annual return of 15% will double your investment in just five years.  Naturally,
we'll work hard to do better,  but I think it's important to realistically  set,
or reset, your expectations going forward.

As we embarked on the 1999 chapter of our  investment  journey,  I must admit to
being a little  wary.  My  concern  was  well-founded  early on.  In the  second
quarter,  our  performance  came under  intense  pressure as investors  began to
rethink some of the fundamental assumptions supporting many of the themes in the
Portfolio.  However,  during this tumultuous period, our analysts  distinguished
themselves through their intensive hands-on research.  They convinced me the sky
was indeed  not  falling  and to summon my courage to hang in there.  I did just
that with our position in  Microsoft.  In fact when the weight of the  antitrust
trial against Microsoft and slower-than-expected release of its new server-based
operating  system  Windows  2000  hampered  the stock,  I actually  added to the
position.  Our research and  persistence  paid off, as Microsoft  recovered  and
ended the year with an impressive 68% gain.

Several other  cornerstone  holdings finished the period strongly as well. Texas
Instruments,  Cisco Systems,  Nokia, and Time Warner possess dominant franchises
and market  positions in industries that are poised to enjoy vigorous growth for
years to come.  Nokia's 220% year-end return placed it at the head of this pack.
Having caught the Web wave, this company now offers Internet-enabled phones. And
while it  continues  to hold the  title of world  leader in the  cellular  phone
equipment  industry,  it should  solidify  its  leadership  position as wireless
subscriber growth multiplies.

Long-time holdings Wal-Mart and Home Depot also produced strong gains. These two
retailing giants continue to execute  masterfully on their business models,  and
their  prominent  market share has enabled them to gain  substantial  purchasing
power.  Adding to our  excitement  for  Wal-Mart  is its  commitment  to further
develop and improve  its Web  strategy.  Meanwhile,  our  enthusiasm  about Home
Depot's  Expo  chain,  which  offers  remodeling  alternatives,   proved  to  be
well-founded.

During the period we also  initiated  several new  positions  in the  Portfolio,
including  Apple  Computer  and Sprint PCS,  which have  proven to be  wonderful
investments.  Apple's  consumer  brand  is  one  of the  most  prominent  in any
industry.  The company enjoys a cult-like  following that most consumer products
companies could only hope to possess. Meanwhile, Sprint PCS with its all-digital
wireless network is keenly poised to benefit from the explosion of wireless data
and Internet services.

We had a few disappointments with our pharmaceutical  holdings. I sold Eli Lilly
and Warner  Lambert when their  pipelines  began to show signs of maturing.  And
although Pfizer's research capabilities and marketing muscle continue to impress
us, its stock was bruised by concerns  that several  pipeline  drugs,  including
antibiotic Trovan,  might not live up to expectations.  We consequently  trimmed
the position.

In closing I'd again like to thank you for your  continued  confidence  in Janus
Aspen Capital Appreciation  Portfolio.  The road ahead is filled with tremendous
opportunity,  and, together with our outstanding analytical staff, I'm confident
we will navigate our investment journey successfully.

Portfolio Asset Mix              December 31, 1999        December 31, 1998
- --------------------------------------------------------------------------------
Equities                                     79.1%                    89.7%
  Foreign                                     7.4%                     5.9%
  Europe                                      4.8%                     5.9%
Top 10 Equities (% of Assets)                44.3%                    57.5%
Number of Stocks                                29                       23
Cash & Cash Equivalents                      20.9%                    10.3%
- --------------------------------------------------------------------------------

(1)  All returns include reinvested dividends.

(2)  Lipper,  Inc.  defines a growth  portfolio  as "a portfolio  that  normally
     invests in companies with long-term earnings expected to grow significantly
     faster than the earnings of the stocks  represented in the major  unmanaged
     stock indices." The ranking is for Institutional  Shares and based on total
     return,  including  reinvestment  of  dividends  and capital  gains for the
     stated period.

Past performance does not guarantee future results.

8  Janus Aspen Series / December 31, 1999
<PAGE>

Average Annual Total Return(1)
For the Periods Ended December 31, 1999
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 5/1/97)
  1 Year                                                     67.00%
  From Inception                                             57.18%
- --------------------------------------------------------------------------------
S&P 500 Index
  1 Year                                                     21.03%
  From Portfolio Inception                                   27.40%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                     66.16%
  From Inception                                             56.43%
- --------------------------------------------------------------------------------
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)

Average Annual Total Return
for the periods ended December 31, 1999
One Year, 67.00%
Since 5/1/97,* 57.18%

[GRAPHIC OMITTED]

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 shaded area of green.  The S&P 500 Index is  represented  by a
solid 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, 1999. The upper and lower right quadrants  reflect the ending value
of the hypothetical  investment in Janus Aspen Capital Appreciation  Portfolio -
Institutional Shares ($33,428) as compared to the S&P 500 Index ($19,075).

Janus Aspen Capital Appreciation Portfolio
- - Institutional Shares - $33,428

S&P 500 Index - $19,075

*The Portfolio's inception date.
Source - Lipper, Inc. 1999.

(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  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.  Concentrating  may lead to greater  price  volatility.  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.
     Concentrating may lead to greater price  volatility.  Past performance does
     not guarantee future results.

SCHEDULE OF INVESTMENTS

Shares or Principal Amount                                          Market Value
================================================================================
Common Stock - 79.1%
Cable Television - 0.8%
     107,280    Comcast Corp. - Special Class A ..............    $    5,390,820

Cellular Telecommunications - 6.4%
     159,485    Sprint Corp./PCS Group* ......................        16,347,212
     339,255    WinStar Communications, Inc.* ................        25,401,718

                                                                      41,748,930

Computer Data Security - 6.0%
     205,150    VeriSign, Inc.* ..............................        39,170,828

Computer Software - 3.1%
     173,540    Microsoft Corp.* .............................        20,260,795

Computers - Memory Devices - 3.3%
     194,950    EMC Corp.* ...................................        21,298,287

Computers - Micro - 4.6%
     287,740    Apple Computer, Inc.* ........................        29,583,269

Distribution and Wholesale - 0.9%
      61,035    Costco Wholesale Corp.* ......................         5,569,444

Diversified Financial Services - 6.7%
     409,365    Citigroup, Inc. ..............................        22,745,343
     148,065    Morgan Stanley Dean Witter and Co. ...........        21,136,279

                                                                      43,881,622

Diversified Operations - 2.9%
     121,115    General Electric Co. .........................        18,742,546

Electronic Components - Semiconductors - 3.3%
     219,590    Texas Instruments, Inc. ......................        21,272,781

Fiber Optics - 1.2%
     163,815    Metromedia Fiber Network, Inc. - Class A* ....    $    7,852,882

Internet Content - 4.9%
     126,345    DoubleClick, Inc.* ...........................        31,973,182

Internet Software - 4.0%
      41,820    Commerce One, Inc.* ..........................         8,217,630
     124,510    Inktomi Corp.* ...............................        11,050,263
      55,170    Phone.com, Inc.* .............................         6,396,272

                                                                      25,664,165

Medical - Drugs - 2.4%
      55,190    MedImmune, Inc.* .............................         9,154,641
     203,412    Pfizer, Inc. .................................         6,598,177

                                                                      15,752,818

Multimedia - 2.6%
     232,220    Time Warner, Inc. ............................        16,821,436

Networking Products - 3.8%
     230,719    Cisco Systems, Inc.* .........................        24,715,773

Optical Supplies - 1.8%
     240,650    Allergan, Inc. ...............................        11,972,337

Retail - Building Products - 1.8%
     168,465    Home Depot, Inc. .............................        11,550,382

Retail - Discount - 3.7%
     351,870    Wal-Mart Stores, Inc. ........................        24,323,014

Satellite Telecommunications - 5.8%
     384,520    EchoStar Communications Corp.* ...............        37,490,700

See Notes to Schedules of Investments.

                                       Janus Aspen Series / December 31, 1999  9
<PAGE>

Janus | Aspen Capital Appreciation Portfolio

SCHEDULE OF INVESTMENTS (continued)

Shares or Principal Amount                                          Market Value
================================================================================
Telecommunication Equipment - 4.8%
     164,760    Nokia Oyj (ADR) ..............................    $   31,304,400

Telecommunication Services - 0.6%
      49,925    Level 3 Communications, Inc.* ................         4,087,609

Telephone - Integrated - 3.7%
      84,230    NEXTLINK Communications, Inc. - Class A* .....         6,996,354
     150,000    Telefonos de Mexico S.A. (ADR) ...............        16,875,000

                                                                      23,871,354
- --------------------------------------------------------------------------------
Total Common Stock (cost $324,130,698) .......................       514,299,374
- --------------------------------------------------------------------------------
Repurchase Agreement - 20.7%
$134,400,000    Deutsche Bank Securities, Inc., 4.55%
                  dated 12/31/99, maturing 1/3/00, to be
                  repurchased at $134,450,960 collateralized
                  by $35,133,175 in Fannie Mae, 4.005%-
                  7.00%, 11/18/15-5/25/29; $147,332,096
                  in Freddie Mac, 0%-7.3262%, 12/15/12-
                  4/1/29; with respective values of
                  $25,456,916 and $111,631,084
                  (cost $134,400,000) ........................       134,400,000
- --------------------------------------------------------------------------------
Total Investments (cost $458,530,698) - 99.8% ................       648,699,374
- --------------------------------------------------------------------------------
Cash, Receivables and Other Assets, net of Liabilities - 0.2%          1,441,111
- --------------------------------------------------------------------------------
Net Assets - 100% ............................................    $  650,140,485
- --------------------------------------------------------------------------------

Summary of Investments by Country, December 31, 1999

Country                        % of Investment Securities          Market Value
- --------------------------------------------------------------------------------
Finland                                    4.8%                   $   31,304,400
Mexico                                     2.6%                       16,875,000
United States++                           92.6%                      600,519,974
- --------------------------------------------------------------------------------
Total                                    100.0%                   $  648,699,374

++Includes Short-Term Securities (71.9% excluding Short-Term Securities)

See Notes to Schedules of Investments.

10  Janus Aspen Series / December 31, 1999
<PAGE>

                                    Janus | Aspen International Growth Portfolio

[PHOTO]
Helen Young Hayes
portfolio manager

[PHOTO]
Laurence Chang
portfolio manager

For the 12 months  ended  December 31, 1999,  Janus Aspen  International  Growth
Portfolio  outperformed its benchmark,  the Morgan Stanley Capital International
EAFE Index.  The  Portfolio  returned  82.27% for its  Institutional  Shares and
81.32% for its Retirement Shares. This compares with a 26.96% gain posted by the
Index.(1)  These results earned the Portfolio a top-decile  ranking,  placing it
9th out of 126  international  portfolios  tracked  by Lipper,  Inc.,  a leading
mutual fund rating company.(2)

The current global  economic  environment is in some respects the inverse of one
year ago. At the  beginning  of the period,  the ongoing  recession in Japan and
effects from the economic implosion in Asian emerging markets sparked fears of a
global deflation.  Today, however,  inflation is the primary concern, and Japan,
as well as several Asian emerging markets,  is on the road to economic recovery.
Meanwhile,  European  activity is  accelerating  and U.S. growth remains robust,
fueling concerns that inflation and interest rates will trend higher.

Against this backdrop,  we continued to focus on great individual  international
companies   that  can  create   shareholder   value   regardless  of  short-term
fluctuations  in the economy.  Many of these  businesses  are in the  converging
world of technology and telecommunications, where the ever-increasing demand for
data-delivery  technologies  such as  wireless  and the  Internet,  is  creating
numerous investment opportunities.

Among the  Portfolio's  strongest  performers  was  Softbank,  the Japanese firm
responsible for funding Internet companies such as Yahoo! and E-Trade as well as
bringing  these and other  e-businesses  into  Japan.  Our cable  holdings  also
performed well,  aided by richer Internet  content and a subsequent  increase in
demand for broadband connectivity. Dutch-based United Pan-Europe Communications,
Rogers  Communications in Canada, and NTL and Telewest  Communications in the UK
were all leaders, and their high-capacity networks continue to position them for
future growth.

Other  companies  that  contributed  to our positive  results  included  several
technological  enablers  of the  Internet,  such as the  Canadian/U.S.  firm JDS
Uniphase and Canadian  telecom  equipment giant Nortel  Networks.  Both lead the
"photonics"  revolution,  an emerging technology that increases network capacity
by breaking down a fiber-optic strand into dozens of different channels.

The  ultimate  Internet  enabler,  however,  is  silicon.  We have  consequently
invested  in  semiconductor  leaders  Philips  Electronics  in the  Netherlands,
STMicroelectronics in France and Galileo Technology in Israel. We also benefited
from  companies  that  enable   semiconductor   manufacturers   to  enhance  the
performance of their chips,  such as Dutch  technology  company ASM Lithography.
Further down the silicon foodchain,  Taiwan Semiconductor  Manufacturing Company
and Singapore-based  Chartered Semiconductor  Manufacturing,  two of the world's
leading outsourcers of semiconductor  fabrication,  also helped our performance,
and we expect both to continue to outpace overall industry growth.

The  "mobilization"  of the  Internet is also  creating new  opportunities.  For
example,  Japanese  cellular  provider NTT DoCoMo has emerged as the mobile data
pioneer and appreciated  nicely during the period. We were also pleased with the
returns  posted  by our  positions  in  leading-edge  wireless  operators  China
Telecom,  Finland's Sonera,  SK Telecom in Korea, the U.K.'s Vodafone  AirTouch,
and Germany's Mannesmann. In particular, Vodafone and Mannesmann performed well,
boosted by  Vodafone's  announcement  that it  intends  to  acquire  Mannesmann,
creating a wireless telecom powerhouse unequaled in the U.K.

As  cellular  companies  upgrade  their  networks  to  accommodate  accelerating
subscriber  growth and new data  applications,  leading telecom  equipment firms
like Nokia in Finland and Sweden's Ericsson  continue to benefit.  Nokia, one of
the largest  positions in the  Portfolio,  is extending its market share in both
its  network  infrastructure  and  cellular  handset  businesses.  Adding to our
enthusiasm for Nokia is our belief that advanced  mobile  applications,  such as
wireless LANs and  high-speed  Internet  access,  will further  increase  market
opportunities.

Not all of our investments  contributed to our positive  results.  We liquidated
Wolters Kluwer,  a Dutch publisher and long-time  holding,  when rising expenses
from the company's  endeavors to adapt to the Internet  signaled a change in its
fundamentals.   We  were  also   disappointed   by  the   performance   of  Tyco
International, a diversified manufacturing company that suffered from reports of
accounting  irregularities.  Although our analysis  reveals its business remains
sound, we believe  investor  perceptions will keep a lid on the stock price, and
thus we trimmed the position.

Going forward, in evaluating  potential  investments for the Portfolio,  we will
continue to focus on the  fundamentals  of  individual  companies  and carefully
monitor   valuation    levels.    Given   the   opportunities   in   technology,
telecommunications  and  cable - as well as other  dynamic  areas of the  global
economy,  such as business  services and  healthcare  - we are  confident in our
ability to deliver compelling investment returns over the long term.

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

Portfolio Asset Mix              December 31, 1999        December 31, 1998
- --------------------------------------------------------------------------------
Equities                                     90.3%                    91.0%
  Foreign                                    82.0%                    89.3%
Number of Stocks                               123                      146
Top 10 Equities (% of Assets)                31.8%                    26.4%
Cash & Cash Equivalents                       9.7%                     9.0%
- --------------------------------------------------------------------------------

(1)   All returns include reinvested dividends. 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.

(2)  Lipper,  Inc. defines an  international  portfolio as one that "invests its
     assets in securities  with primary  trading  markets  outside of the United
     States."  As  of  December  31,  1999,  Janus  Aspen  International  Growth
     Portfolio  ranked  1/53  for  the  5-year  period.   This  ranking  is  for
     Institutional Shares and based on total return,  including  reinvestment of
     dividends and capital gains for the stated period.

Past performance does not guarantee future results.

                                      Janus Aspen Series / December 31, 1999  11
<PAGE>

Average Annual Total Return(1)
For the Periods Ended December 31, 1999
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 5/2/94)
  1 Year                                                     82.27%
  5 Year                                                     33.25%
  From Inception                                             28.19%
- --------------------------------------------------------------------------------
Morgan Stanley Capital International EAFE Index(2)
  1 Year                                                     26.96%
  5 Year                                                     12.83%
  From Inception Date of Institutional Shares                11.22%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                     81.32%
  5 Year                                                     32.06%
  From Portfolio Inception                                   27.11%
- --------------------------------------------------------------------------------
Returns shown for  Retirement  Shares for periods  prior to their  inception are
derived from the historical  performance of  Institutional  Shares,  adjusted to
reflect the higher operating expenses of Retirement Shares.

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)

Average Annual Total Return
for the periods ended December 31, 1999
One Year, 82.27%
Five Year, 33.25%
Since 5/2/94,* 28.19%

[GRAPHIC OMITTED]

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 shaded area of
green. The Morgan Stanley Capital  International  EAFE Index is represented by a
solid 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, 1999. The upper and lower right quadrants  reflect the ending value
of the hypothetical  investment in Janus Aspen International  Growth Portfolio -
Institutional  Shares  ($40,834)  as  compared  to the  Morgan  Stanley  Capital
International EAFE Index ($18,268).

Janus Aspen International Growth Portfolio
- - Institutional Shares - $40,834

Morgan Stanley Capital
International EAFE Index - $18,268

*The Portfolio's inception date.
Source - Lipper, Inc. 1999.

(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  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 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. 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.  Foreign  investing  involves
     special risks such as currency fluctuation and political uncertainty.  Past
     performance does not guarantee future results.

SCHEDULE OF INVESTMENTS

Shares or Principal Amount                                          Market Value
================================================================================
Common Stock - 87.2%
Apparel Manufactures - 0.6%
       2,954    Gucci Group N.V.** ...........................    $      340,262
      39,865    Gucci Group N.V. - New York Shares** .........         4,564,543

                                                                       4,904,805

Audio and Video Products - 2.5%
      68,400    Sony Corp.** .................................        20,283,030

Brewery - 0.1%
     107,000    Kirin Brewery Company, Ltd.** ................         1,125,710

Broadcast Services and Programming - 1.9%
      16,335    EM.TV & Merchandising A.G.** .................         1,051,712
      79,255    Grupo Televisa S.A. (GDR)* ...................         5,409,154
     134,390    UnitedGlobalCom, Inc. - Class A* .............         9,491,294

                                                                      15,952,160

Cable Television - 3.0%
     252,045    Le Groupe Videotron ltee.** ..................         4,266,636
      23,075    Rogers Communications, Inc.*,** ..............           571,106
     324,696    Rogers Communications, Inc. - Class B*,** ....         7,919,415
     786,969    Telewest Communications PLC*,** ..............         4,192,573
      65,117    United Pan-Europe Communications N.V.*,** ....         8,319,478

                                                                      25,269,208

Cellular Telecommunications - 12.7%
     234,130    China Telecom, Ltd. (ADR)* ...................    $   30,100,338
       1,394    NTT Mobile Communications
                  Network, Inc.** ............................        53,615,385
     258,425    Partner Communications Company
                  Ltd. (ADR)* ................................         6,686,747
     410,555    Telecom Italia Mobile S.p.A.** ...............         4,568,396
      55,635    Telesp Celular Participacoes S.A. (ADR) ......         2,357,533
     477,684    Vodafone AirTouch PLC** ......................         2,353,479
      87,100    Vodafone AirTouch PLC (ADR)** ................         4,311,450

                                                                     103,993,328

Commercial Banks - 0.9%
      62,806    Argentaria, Caja Postal y Banco Hipotecario
                  de Espana, S.A.** ..........................         1,474,056
      46,824    Bipop - Carire S.p.A.** ......................         4,136,285
          36    Julius Baer Holding A.G. - Class B** .........           108,769
     275,501    UniCredito Italiano S.p.A.** .................         1,353,620

                                                                       7,072,730

Computer Data Security - 1.7%
      59,750    Baltimore Technologies PLC** .................         4,839,886
      45,640    Check Point Software Technologies, Ltd.* .....         9,070,950

                                                                      13,910,836

See Notes to Schedules of Investments.

12  Janus Aspen Series / December 31, 1999
<PAGE>

                                    Janus | Aspen International Growth Portfolio

SCHEDULE OF INVESTMENTS (continued)

Shares or Principal Amount                                          Market Value
================================================================================
Computer Services - 3.8%
      45,321    Atos S.A.*,** ................................    $    7,504,596
      20,745    Cap Gemini S.A.** ............................         5,259,106
      41,223    CMG PLC** ....................................         3,030,829
     119,763    Getronics N.V.** .............................         9,542,141
       5,271    Information Highway A.B.* ....................           873,800
     206,760    Logica PLC** .................................         5,343,340
       3,912    WM-Data A.B. - Class B .......................           241,927

                                                                      31,795,739

Computer Software - 0.4%
      56,067    Tietoenator Oyj** ............................         3,497,011

Computers - Integrated Systems - 2.3%
      26,928    ASM Lithography Holding N.V.*,** .............         2,987,979
      26,664    ASM Lithography Holding N.V. (ADR)*,** .......         3,033,030
       7,733    Equant N.V.*,** ..............................           876,738
      15,129    Equant N.V. - New York Shares*,** ............         1,694,448
     102,000    Fujitsu, Ltd.** ..............................         4,651,791
      53,066    Psion PLC** ..................................         2,314,229
     161,344    SEMA Group PLC** .............................         2,900,937

                                                                      18,459,152

Computers - Micro - 1.0%
   3,424,000    Legend Holdings, Ltd.** ......................         8,501,053

Diversified Operations - 2.4%
     157,440    Bombardier, Inc. - Class B** .................         3,225,382
     268,113    Hays PLC** ...................................         4,276,455
     204,235    Tyco International, Ltd. .....................         7,939,636
      44,297    Vivendi** ....................................         3,995,053

                                                                      19,436,526

Electronic Components - 2.8%
       5,726    Celestica, Inc.** ............................           319,672
      80,730    Celestica, Inc. - New York Shares*,** ........         4,480,515
      63,928    Koninklijke (Royal) Phillips Electronics N.V.**        8,682,062
      32,558    Koninklijke (Royal) Phillips Electronics N.V.
                  - New York Shares** ........................         4,395,330
     225,000    NEC Corp.** ..................................         5,361,861

                                                                      23,239,440

Electronic Components - Semiconductors - 2.5%
      61,920    Chartered Semiconductor Manufacturing,
                  Ltd. (ADR)*,** .............................         4,520,160
     117,810    Galileo Technology, Ltd.* ....................         2,842,166
       4,200    Rohm Company, Ltd.** .........................         1,726,365
      28,279    STMicroelectronics N.V.** ....................         4,346,957
         780    STMicroelectronics N.V. - N.Y. Shares** ......           118,121
     157,659    Taiwan Semiconductor Manufacturing
                  Company, Ltd. (ADR)* .......................         7,094,655

                                                                      20,648,424

Engineering - Research and Development - 0.3%
      22,889    ABB, Ltd.*,** ................................         2,800,021

Fiber Optics - 1.8%
      90,712    JDS Uniphase Corp.* ..........................        14,632,980
       3,525    Lumenon Innovative Lightwave
                  Technology, Inc.*,** .......................            90,769

                                                                      14,723,749

Food - Catering - 0.6%
     372,740    Compass Group PLC** ..........................         5,117,422

Food - Retail - 0.5%
      20,310    Carrefour S.A.** .............................         3,741,074

Human Resources - 0.5%
     220,552    Capita Group PLC** ...........................    $    4,007,650

Internet Content - 3.3%
      94,621    Melbourne IT, Ltd.* ..........................           529,810
      24,900    Softbank Corp.** .............................        23,832,648
      55,355    StarMedia Network, Inc.* .....................         2,217,660
      10,427    Terra Networks S.A.*,** ......................           569,059

                                                                      27,149,177

Internet Software - 1.0%
      14,835    Internet Initiative Japan, Inc.*,** ..........         1,441,777
      22,994    Intershop Communications A.G.*,** ............         6,476,950
      20,101    Nocom A.B. - Class B* ........................           479,749

                                                                       8,398,476

Life and Health Insurance - 0.6%
     251,726    Prudential PLC** .............................         4,960,372

Machinery - General Industrial - 3.1%
     105,916    Mannesmann A.G.** ............................        25,785,462

Medical - Drugs - 0.9%
     129,000    Takeda Chemical Industries, Ltd.** ...........         6,375,514
      35,000    Yamanouchi Pharmaceutical Company, Ltd.** ....         1,222,842

                                                                       7,598,356

Medical - Products - 0.3%
       6,080    Synthes-Stratec, Inc.*,**,+ ..................         2,833,280

Metal Processors and Fabricators - 0.8%
     487,273    Assa Abloy A.B. - Class B ....................         6,846,055

Money Center Banks - 1.4%
     149,013    Banco Bilbao Vizcaya S.A.** ..................         2,119,686
     203,525    DBS Group Holdings, Ltd.** ...................         3,335,064
     635,000    Fuji Bank, Ltd.** ............................         6,171,022

                                                                      11,625,772

Multimedia - 2.5%
      99,002    Corus Entertainment, Inc. - Class B*,** ......         2,017,936
     115,017    Shaw Communications, Inc. - Class B** ........         3,786,748
     246,915    Viacom, Inc. - Class B* ......................        14,922,925

                                                                      20,727,609

Oil Companies - Integrated - 0.8%
      70,735    Petroleo Brasileiro S.A. (ADR) ...............         1,814,211
      37,354    Total Fina S.A.** ............................         4,979,101

                                                                       6,793,312

Petrochemicals - 0.4%
     224,669    Reliance Industries, Ltd.+ ...................         3,257,701

Property and Casualty Insurance - 0.3%
     189,000    Tokio Marine & Fire Insurance
                  Company, Ltd.** ............................         2,210,364

Publishing - Newspapers - 0.4%
     154,000    Singapore Press Holdings, Ltd.** .............         3,336,965

Retail - Diversified - 0.4%
      33,000    Ito-Yokado Company, Ltd.** ...................         3,584,850

Retail - Internet - 1.0%
     366,915    QXL.com PLC*,** ..............................         8,534,032

Satellite Telecommunications - 0.2%
      30,788    PT MULTIMEDIA - Servicos de
                  Telecomunicacoes e Multimedia
                  SGPS S.A.*,**,+ ............................         1,749,030

Security Services - 1.3%
     578,488    Securitas A.B. - Class B .....................        10,474,064

See Notes to Schedules of Investments.

                                      Janus Aspen Series / December 31, 1999  13
<PAGE>

Janus | Aspen International Growth Portfolio

SCHEDULE OF INVESTMENTS (continued)

Shares or Principal Amount                                          Market Value
================================================================================
Telecommunication Equipment - 9.9%
       6,549    ADVA A.G. Optical Networking*,** .............    $    1,238,599
      33,300    Comverse Technology, Inc.* ...................         4,820,175
     317,071    Datacraft Asia, Ltd.** .......................         2,631,689
       7,000    Matsushita Communication Industrial
                  Company, Ltd.** ............................         1,849,677
     135,410    Nokia Oyj** ..................................        24,520,043
      98,295    Nokia Oyj (ADR)** ............................        18,676,050
     158,545    Nortel Networks Corp.** ......................        16,013,045
     116,134    Telefonaktiebolaget L.M. Ericsson (ADR) ......         7,628,552
      73,798    Telefonaktiebolaget L.M. Ericsson - Class B ..         4,746,047

                                                                      82,123,877

Telecommunication Services - 10.5%
     195,200    Amdocs, Ltd.* ................................         6,734,400
      26,942    BCE, Inc.** ..................................         2,441,404
     338,522    COLT Telecom Group PLC*,** ...................        17,332,949
      15,130    Dacom Corp.* .................................         7,798,282
     142,964    Energis PLC*,** ..............................         6,869,735
      84,360    FirstCom Corp.* ..............................         3,100,230
       9,340    Korea Thrunet Company, Ltd. - Class A* .......           633,952
      90,983    KPNQwest N.V.*,** ............................         6,050,060
      51,537    NTL, Inc.* ...................................         6,429,241
         241    NTT Data Corp.** .............................         5,542,670
     364,370    SK Telecom Company, Ltd. (ADR) ...............        14,402,176
     142,445    Sonera Oyj** .................................         9,751,543

                                                                      87,086,642

Telephone - Integrated - 4.4%
         120    Nippon Telegraph & Telephone Corp.** .........         2,055,197
     698,567    Telefonica S.A.*,** ..........................        17,428,408
      10,895    Telefonica S.A. (ADR)*,** ....................           858,662
      74,100    Telefonos de Mexico S.A. (ADR) ...............         8,336,250
     200,134    Versatel Telecom International N.V.*,** ......         7,046,718

                                                                      35,725,235

Therapeutics - 0.8%
     117,390    QLT PhotoTherapeutics, Inc.*,** ..............         6,896,663

Transportation - Air Freight - 0.6%
     170,838    TNT Post Group N.V.** ........................         4,889,503

Wire and Cable Products - 0%
      12,000    Furukawa Electric Co., Ltd.** ................           182,032
- --------------------------------------------------------------------------------
Total Common Stock (cost $342,540,451) .......................       721,247,897
- --------------------------------------------------------------------------------
Preferred Stock - 3.1%
Automotive - Cars and Light Trucks - 0.8%
       2,367    Porsche A.G.** ...............................    $    6,476,869

Broadcast Services and Programming - 0.7%
      69,060    UnitedGlobalCom, convertible, 7.00%+ .........         6,267,195

Diversified Financial Services - 0.6%
      15,022    Marschollek, Lautenschlaeger und
                  Partner A.G.** .............................         4,533,640

Telephone - Integrated - 1.0%
      63,675    Telecomunicacoes Brasileiras S.A. (ADR) ......         8,182,238
- --------------------------------------------------------------------------------
Total Preferred Stock (cost $15,605,887) .....................        25,459,942
- --------------------------------------------------------------------------------
Repurchase Agreement - 8.8%
$ 73,100,000    Deutsche Bank Securities, Inc., 4.55%
                  dated 12/31/99, maturing 1/3/00, to be
                  repurchased at $73,127,717 collateralized
                  by $19,108,892 in Fannie Mae, 4.005%-
                  7.00%, 11/18/15-5/25/29; $80,133,752
                  in Freddie Mac, 0%-7.3262%, 12/15/12-
                  4/1/29; with respective values of
                  $13,845,987 and $60,716,014
                  (cost $73,100,000) .........................        73,100,000
- --------------------------------------------------------------------------------
Total Investments (total cost $431,246,338) - 99.1% ..........       819,807,839
- --------------------------------------------------------------------------------
Cash, Receivables and Other Assets, net of Liabilities - 0.9%          7,569,995
- --------------------------------------------------------------------------------
Net Assets - 100% ............................................    $  827,377,834
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

14  Janus Aspen Series / December 31, 1999
<PAGE>

Summary of Investments by Country, December 31, 1999

Country                        % of Investment Securities          Market Value
- --------------------------------------------------------------------------------
Australia                                  0.1%                   $      529,810
Bermuda                                    1.0%                        7,939,636
Brazil                                     1.5%                       12,353,981
Canada                                     6.3%                       52,029,289
Finland                                    6.9%                       56,444,646
France                                     3.1%                       25,597,051
Germany                                    5.6%                       45,563,232
Hong Kong                                  4.7%                       38,601,391
India                                      0.4%                        3,257,701
Israel                                     2.3%                       18,599,863
Italy                                      1.2%                       10,058,301
Japan                                     17.2%                      141,232,733
Mexico                                     1.7%                       13,745,404
Netherlands                                8.1%                       66,769,250
Portugal                                   0.2%                        1,749,030
Singapore                                  1.7%                       13,823,877
South Korea                                2.8%                       22,834,410
Spain                                      2.7%                       22,449,870
Sweden                                     3.8%                       31,290,195
Switzerland                                0.7%                        5,742,069
Taiwan                                     0.9%                        7,094,655
United Kingdom                             9.8%                       80,385,352
United States++                           17.3%                      141,716,093
- --------------------------------------------------------------------------------
Total                                    100.0%                   $  819,807,839

++Includes Short-Term Securities (8.4% excluding Short-Term Securities)

Forward Currency Contracts, Open at December 31, 1999

Currency Sold and                  Currency            Currency       Unrealized
Settlement Date                  Units Sold     Value in $ U.S.      Gain/(Loss)
- --------------------------------------------------------------------------------
British Pound 4/7/00              5,500,000       $   8,896,250      $    19,424
British Pound 4/20/00               500,000             808,750            3,130
British Pound 6/9/00              7,500,000          12,128,250           30,732
Canadian Dollar 4/7/00            8,900,000           6,171,982         (69,006)
Canadian Dollar 5/18/00           1,100,000             763,571         (10,146)
Euro 4/7/00                      33,000,000          33,471,900          558,230
Euro 4/14/00                     12,000,000          12,177,600          782,400
Euro 4/20/00                        110,000             111,672            9,372
Euro 5/18/00                      1,200,000           1,220,640           36,360
Euro 6/2/00                       7,400,000           7,534,680          220,520
Euro 6/9/00                      11,600,000          11,816,920          145,208
Hong Kong Dollar
  5/7/01                        124,000,000          15,839,561        (187,437)
Hong Kong Dollar
  5/10/01                        76,000,000           9,708,118         (37,015)
Japanese Yen 3/16/00            369,300,000           3,658,522         (40,582)
Japanese Yen 4/7/00             600,000,000           5,965,128        (132,891)
Japanese Yen 4/14/00            500,000,000           4,976,754        (131,792)
Japanese Yen 4/20/00            730,000,000           7,273,343        (163,877)
Japanese Yen 5/18/00            450,700,000           4,511,661        (127,419)
Japanese Yen 6/2/00              50,000,000             501,781         (14,926)
Singapore Dollar 7/16/01          2,300,000           1,443,364         (20,521)
Swiss Franc 6/2/00                1,600,000           1,024,393           27,546
- --------------------------------------------------------------------------------
Total                                             $ 150,004,840      $   897,310

See Notes to Schedules of Investments.

                                      Janus Aspen Series / December 31, 1999  15
<PAGE>

Janus | Aspen Worldwide Growth Portfolio

[PHOTO]
Helen Young Hayes
portfolio manager

[PHOTO]
Laurence Chang
portfolio manager

Janus Aspen Worldwide Growth Portfolio performed solidly for the 12 months ended
December 31, 1999,  returning 64.45% for its Institutional Shares and 63.66% for
its  Retirement  Shares.  This  compares with a 24.93% gain posted by the Morgan
Stanley Capital  International World Index.(1) As a result, the Portfolio earned
a  top-quartile  ranking,  placing 13th out of 52 global  portfolios  tracked by
Lipper, Inc., a leading mutual fund rating company.(2)

We achieved these strong results despite a volatile global economic environment.
After enduring an extended recession,  Japan at long last began to show signs of
economic recovery. More important,  many Japanese corporations took steps toward
restructuring  by divesting  noncore  businesses,  reducing  excess capacity and
being more  disciplined in allocating  capital.  In the Asian emerging  markets,
economic  activity bounced back far more vigorously from last fall's crisis than
initially  expected.   In  turn,  we  identified  a  number  of  new  investment
opportunities  in these  areas.  Meanwhile,  stronger-than-anticipated  economic
growth  globally  drove  up  interest  rates in the U.S.  and  Europe,  creating
uncertainty in these markets.

Over the past 12 months, we have continued to evolve into an information-driven,
networked  global  economy.  In fact,  Federal  Reserve  Chairman Alan Greenspan
recently noted that the "defining  characteristic  of the wave of  technological
innovation  sweeping  over the U.S.  economy  is the  role of  information."  We
believe this comment  increasingly  applies outside the U.S. as well, and we are
finding  many  exciting  opportunities  in the global  companies  leading  these
changes.

One such leader is Softbank, a Japanese firm that provides funding for companies
like Yahoo! and E-Trade and has brought these and other Internet businesses into
Japan.  Within the U.S.,  strong  performers  included  top  software  developer
Microsoft,  America Online,  the world's largest Internet service provider,  and
Amazon.com, which is emerging as the online retailer of choice.

The continued  rise in demand for media content  benefited a number of stocks in
the Portfolio,  including U.S. cable content  providers  Viacom and AT&T Liberty
Media Group.  Our cable holdings also performed  well,  aided by richer Internet
content  and  a  subsequent  increase  in  demand  for  broadband  connectivity.
U.S.-based  Time  Warner  and  Comcast,  as well as  British-based  NTL were all
leaders,  and their high-capacity  networks continue to position them for future
growth.  Deregulation and the  digitalization of broadcast media have opened new
revenue opportunities for these companies, from telephone services to e-commerce
offerings.

The exploding  volume of data - doubling every six to seven months - has created
enormous  opportunities  for the leading  companies  that  provide the  Internet
infrastructure.  Cisco Systems,  with its dominance in routing  technology;  Sun
Microsystems,  with its increasing  share in Web servers;  and EMC, which builds
high-end data storage systems, are three U.S. businesses with unique franchises.
We've also identified several international leaders,  including Canadian telecom
equipment giant Nortel Networks.

Other Internet enablers include silicon  chipmakers such as global leaders Texas
Instruments in the U.S. and STMicroelectronics in France, both of which rewarded
us with strong gains.  We also  benefited  from our positions in companies  that
provide  semiconductor  manufacturers with the technology to continually enhance
the  performance  of  their  chips,   including  Dutch  technology  company  ASM
Lithography.

In  wireless  communications,  Japan's NTT  DoCoMo,  recognized  as a pioneer in
mobile  data,  was another  extraordinary  performer  for the  Portfolio.  Other
wireless  holdings that impressed us were China  Telecom,  Mannesmann in Germany
and U.S.-based  Sprint PCS and AirTouch  Communications  (now part of the U.K.'s
Vodafone).  Vodafone's  recent bid for Mannesmann  provided a nice boost to both
stocks, and if its bid is accepted,  the merger should create a wireless telecom
business unequaled in the U.K.

Our   enthusiasm   for  the   wireless   business   also  extends  to  equipment
manufacturers.  As telecom  companies upgrade their networks to accommodate both
accelerating subscriber growth and new data applications,  equipment makers like
Nokia in Finland and Sweden's Ericsson continue to benefit.

Despite  the   Portfolio's   impressive   returns,   we  did  experience  a  few
disappointments.  Among  them was the Dutch  publisher  Wolters  Kluwer.  Rising
expenses linked to the company's  Internet and online  distribution  initiatives
hurt this stock, and we consequently liquidated our position. Another stock that
fell  short  of  our   expectations  was  Tyco   International,   a  diversified
manufacturing company plagued by reports of accounting irregularities.  While we
believe Tyco's  business  fundamentals  remain strong,  the negative  perception
created by these  reports  will  likely  keep a lid on the stock  price for some
time. Thus, we trimmed our position.

Looking  ahead,  by taking a broad  view of the  dramatic  changes in the global
economy yet still retaining our philosophy of building the Portfolio one company
at a time, we are confident we will be able to continue  identifying  compelling
ideas in a rapidly changing marketplace.

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

Portfolio Asset Mix              December 31, 1999        December 31, 1998
- --------------------------------------------------------------------------------
Equities                                     90.4%                    90.0%
  Foreign                                    61.2%                    65.8%
Number of Stocks                               130                      156
Top 10 Equities (% of Assets)                34.3%                    25.9%
Cash & Cash Equivalents                       9.6%                    10.0%
- --------------------------------------------------------------------------------

(1)  All returns include reinvested dividends.  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.

(2)  Lipper,  Inc. defines an global portfolio as one that "invests at least 25%
     of its portfolio in securities traded outside the United States and may own
     U.S.  securities as well." As of December 31, 1999,  Janus Aspen  Worldwide
     Growth  Portfolio  ranked  2/23 for the 5-year  period.  The ranking is for
     Institutional  Shares  and  based on  total  return,  including  reinvested
     dividends and capital gains for the stated period.

Past performance does not guarantee future results.

16  Janus Aspen Series / December 31, 1999
<PAGE>

Average Annual Total Return(1)
For the Periods Ended December 31, 1999
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 9/13/93)
  1 Year                                                     64.45%
  5 Year                                                     33.60%
  From Inception                                             29.71%
- --------------------------------------------------------------------------------
Morgan Stanley Capital International World Index(2)
  1 Year                                                     24.93%
  5 Year                                                     19.76%
  From Inception Date of Institutional Shares                16.41%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                     63.66%
  5 Year                                                     32.78%
  From Portfolio Inception                                   28.77%
- --------------------------------------------------------------------------------
Returns shown for  Retirement  Shares for periods  prior to their  inception are
derived from the historical  performance of  Institutional  Shares,  adjusted to
reflect the higher operating expenses of Retirement Shares.

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)

Average Annual Total Return
for the periods ended December 31, 1999
One Year, 64.45%
Five Year, 33.60%
Since 9/13/93,* 29.71%

[GRAPHIC OMITTED]

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 shaded area of green.  The
Morgan Stanley Capital International World Index is represented by a solid 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,
1999.  The upper and lower  right  quadrants  reflect  the  ending  value of the
hypothetical   investment   in  Janus  Aspen   Worldwide   Growth   Portfolio  -
Institutional  Shares  ($51,470)  as  compared  to the  Morgan  Stanley  Capital
International World Index ($26,041).

Janus Aspen Worldwide Growth Portfolio
- - Institutional Shares - $51,470

Morgan Stanley
Capital International
World Index - $26,041

*The Portfolio's inception date.
Source - Lipper, Inc. 1999.

(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  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 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. 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. Foreign investing involves special risks such
     as currency  fluctuation and political  uncertainty.  Past performance does
     not guarantee future results.

SCHEDULE OF INVESTMENTS

Shares or Principal Amount                                          Market Value
================================================================================
Common Stock - 88.8%
Apparel Manufacturers - 0.4%
       1,741    Gucci Group N.V.** ...........................    $      200,541
     202,186    Gucci Group N.V. - New York Shares** .........        23,150,297

                                                                      23,350,838

Audio and Video Products - 2.5%
     558,600    Sony Corp.** .................................       165,644,745

Brewery - 0.1%
     920,000    Kirin Brewery Company, Ltd.** ................         9,678,998

Broadcast Services and Programming - 2.3%
   1,143,115    AT&T Corp./Liberty Media Group - Class A* ....        64,871,776
     326,415    Clear Channel Communications, Inc.* ..........        29,132,539
     245,276    EM.TV & Merchandising A.G.** .................        15,791,850
     643,755    Grupo Televisa S.A. (GDR)* ...................        43,936,279

                                                                     153,732,444

Cable Television - 2.7%
   1,379,760    Comcast Corp. - Special Class A ..............        69,332,940
     209,740    Rogers Communications, Inc.*,** ..............         5,191,065
     941,834    Rogers Communications, Inc. - Class B*,** ....        22,971,561
   7,227,747    Telewest Communications PLC*,** ..............        38,505,785
     363,678    United Pan-Europe Communications N.V.*,** ....        46,464,229

                                                                     182,465,580

Cellular Telecommunications - 11.9%
   1,865,980    China Telecom, Ltd. (ADR)*,** ................    $  239,895,054
     127,060    Nextel Communications, Inc. - Class A* .......        13,103,062
      10,629    NTT Mobile Communications
                  Network, Inc.** ............................       408,807,692
     325,365    Sprint Corp./PCS Group* ......................        33,349,912
   3,694,085    Telecom Italia Mobile S.p.A.** ...............        41,105,436
   1,983,095    Vodafone AirTouch PLC** ......................         9,770,417
   1,044,385    Vodafone AirTouch PLC (ADR)** ................        51,697,058

                                                                     797,728,631

Commercial Banks - 0.8%
     609,526    Argentaria, Caja Postal y Banco Hipotecario
                  de Espana S.A.** ...........................        14,305,563
     429,589    Bipop - Carire S.p.A.** ......................        37,948,543
         143    Julius Baer Holding A.G. - Class B** .........           432,054

                                                                      52,686,160

Commercial Services - 0.3%
     426,290    Paychex, Inc. ................................        17,051,600

Computer Data Security - 0.6%
     183,460    Check Point Software Technologies, Ltd.* .....        36,462,675
      22,200    VeriSign, Inc.* ..............................         4,238,812

                                                                      40,701,487

See Notes to Schedules of Investments.

                                      Janus Aspen Series / December 31, 1999  17
<PAGE>

Janus | Aspen Worldwide Growth Portfolio


SCHEDULE OF INVESTMENTS (continued)

Shares or Principal Amount                                          Market Value
================================================================================
Computer Services - 3.4%
     131,228    Atos S.A.*,** ................................    $   21,729,730
     186,391    Cap Gemini S.A.** ............................        47,252,355
     178,525    Electronic Data Systems Corp. ................        11,950,017
   1,090,128    Getronics N.V.** .............................        86,856,166
   1,817,201    Logica PLC** .................................        46,962,289
      81,925    Whittman-Hart, Inc.* .........................         4,393,228
     134,324    WM-Data A.B. - Class B .......................         8,306,910

                                                                     227,450,695

Computer Software - 2.2%
   1,047,605    Microsoft Corp.* .............................       122,307,884
     444,287    Tietoenator Oyj** ............................        27,711,069

                                                                     150,018,953

Computers - Integrated Systems - 2.0%
     159,179    ASM Lithography Holding N.V.*,** .............        17,662,788
     123,360    ASM Lithography Holding N.V. (ADR)*,** .......        14,032,200
      69,207    Equant N.V.*,** ..............................         7,846,427
     137,855    Equant N.V. - New York Shares*,** ............        15,439,760
   1,139,000    Fujitsu, Ltd.** ..............................        51,944,999
   1,344,777    SEMA Group PLC** .............................        24,178,857

                                                                     131,105,031

Computers - Memory Devices - 1.1%
     637,540    EMC Corp.* ...................................        69,651,245
      14,885    VERITAS Software Corp.* ......................         2,130,416

                                                                      71,781,661

Computers - Micro - 2.1%
   1,128,670    Dell Computer Corp.* .........................        57,562,170
     205,445    IBM Corp. ....................................        22,188,060
     818,740    Sun Microsystems, Inc.* ......................        63,401,179

                                                                     143,151,409

Consulting Services - 0.1%
     104,270    USWeb Corp.* .................................         4,633,498

Diversified Operations - 2.3%
   2,495,567    Hays PLC** ...................................        39,804,785
   2,076,160    Tyco International, Ltd. .....................        80,710,720
     393,612    Vivendi** ....................................        35,499,040

                                                                     156,014,545

Electronic Components - 3.0%
      50,654    Celestica, Inc.*,** ..........................         2,827,916
     714,170    Celestica, Inc, - New York Shares*,** ........        39,636,435
     528,033    Koninklijke (Royal) Phillips Electronics N.V.**       71,712,162
     325,926    Koninklijke (Royal) Phillips Electronics N.V .
                  - New York Shares** ........................        44,000,010
   1,886,000    NEC Corp.** ..................................        44,944,314

                                                                     203,120,837

Electronic Components - Semiconductors - 2.0%
     268,060    Applied Materials, Inc.* .....................        33,959,851
      38,900    Rohm Company, Ltd.** .........................        15,989,430
     258,255    STMicroelectronics N.V.** ....................        39,698,132
       7,015    STMicroelectronics N.V. - New York Shares** ..         1,062,334
     444,425    Texas Instruments, Inc. ......................        43,053,672

                                                                     133,763,419

Engineering - Research and Development - 0.4%
     198,533    ABB, Ltd.*,** ................................        24,286,622

Enterprise Software and Services - 0.5%
     305,830    BEA Systems, Inc.* ...........................        21,388,986
      56,460    i2 Technologies, Inc.* .......................        11,009,700

                                                                      32,398,686

Fiber Optics - 1.1%
     449,440    JDS Uniphase Corp.* ..........................    $   72,500,290

Finance - Credit Card - 0.7%
     272,045    American Express Co. .........................        45,227,481

Food - Catering - 0.4%
   1,902,740    Compass Group PLC** ..........................        26,123,098

Food - Retail - 0.7%
     251,649    Carrefour S.A.** .............................        46,353,393

Human Resources - 0.4%
   1,531,133    Capita Group PLC** ...........................        27,822,218

Instruments - Scientific - 0.3%
     140,610    PE Corp./PE Biosystems Group .................        16,917,141

Internet Content - 1.1%
      74,800    Softbank Corp.** .............................        71,593,658

Internet Software - 1.0%
     753,050    America Online, Inc.* ........................        56,808,209
      82,915    Phone.com, Inc.* .............................         9,612,958

                                                                      66,421,167

Life and Health Insurance - 0.7%
   2,292,623    Prudential PLC** .............................        45,177,145

Machinery - General Industrial - 3.2%
     871,017    Mannesmann A.G.** ............................       212,050,831

Medical - Biomedical and Genetic - 0.6%
     300,195    Genentech, Inc.* .............................        40,376,228

Medical - Drugs - 2.5%
   1,214,930    Pfizer, Inc. .................................        39,409,292
     798,770    Schering-Plough Corp. ........................        33,698,109
     140,940    Sepracor, Inc.* ..............................        13,979,486
     949,000    Takeda Chemical Industries, Ltd.** ...........        46,902,036
     276,658    Warner-Lambert Co. ...........................        22,668,665
     317,000    Yamanouchi Pharmaceutical Company, Ltd.** ....        11,075,455

                                                                     167,733,043

Medical Instruments - 0.6%
   1,096,485    Medtronic, Inc. ..............................        39,953,172

Medical Products - 0.4%
      51,851    Synthes-Stratec, Inc.*,**,+ ..................        24,162,566

Metal Processors and Fabricators - 0.7%
   3,505,541    Assa Abloy A.B. - Class B ....................        49,251,913

Money Center Banks - 1.4%
   1,435,375    Banco Bilbao Vizcaya S.A.** ..................        20,417,980
     472,370    Bank of New York Company, Inc. ...............        18,894,800
   5,511,000    Fuji Bank, Ltd.** ............................        53,556,694

                                                                      92,869,474

Multimedia - 4.0%
      99,908    Shaw Communications, Inc. - Class B** ........         3,289,309
   1,624,385    Time Warner, Inc. ............................       117,666,388
   2,142,155    Viacom, Inc. - Class B* ......................       129,466,493
     497,505    Walt Disney Co. (The) ........................        14,552,021

                                                                     264,974,211

Networking Products - 4.9%
     164,010    3Com Corp.* ..................................         7,708,470
   2,979,660    Cisco Systems, Inc.* .........................       319,196,078

                                                                     326,904,548

Oil Companies - Integrated - 0.9%
     614,065    Petroleo Brasileiro S.A. (ADR) ...............        15,749,539
     333,488    Total Fina S.A.** ............................        44,452,283

                                                                      60,201,822

See Notes to Schedules of Investments.

18  Janus Aspen Series / December 31, 1999
<PAGE>

Shares or Principal Amount                                          Market Value
================================================================================
Pipelines - 0.4%
     561,590    Enron Corp. ..................................    $   24,920,556

Property and Casualty Insurance - 0.3%
   1,643,000    Tokio Marine & Fire Insurance
                  Company, Ltd.** ............................        19,214,964

Radio - 0.2%
     190,300    AMFM, Inc.* ..................................        14,890,975

Recycling - 0.1%
     331,436    Tomra Systems A.S.A ..........................         5,618,470

Retail - Diversified - 0.4%
     271,000    Ito-Yokado Company, Ltd.** ...................        29,439,225

Retail - Internet - 0.3%
     291,810    Amazon.com, Inc.* ............................        22,214,036

Retail - Office Supplies - 0.3%
     936,890    Staples, Inc.* ...............................        19,440,468

Security Services - 0.8%
   3,070,394    Securitas A.B. - Class B .....................        55,592,343

Super-Regional Banks - 0.0%
      42,481    Firstar Corp. ................................           897,411

Telecommunication Equipment - 10.6%
     307,185    Comverse Technology, Inc.* ...................        44,465,029
     605,025    Lucent Technologies, Inc. ....................        45,263,433
   1,222,094    Nokia Oyj** ..................................       221,296,782
     975,085    Nokia Oyj (ADR)** ............................       185,266,150
   1,004,610    Nortel Networks Corp.** ......................       101,465,610
     703,667    Telefonaktiebolaget L.M. Ericsson (ADR) ......        46,222,126
     998,208    Telefonaktiebolaget L.M. Ericsson - Class B ..        64,196,082

                                                                     708,175,212

Telecommunications Services - 4.4%
     238,050    Amdocs, Ltd.* ................................         8,212,725
   1,455,103    COLT Telecom Group PLC*,** ...................        74,503,951
   1,294,866    Energis PLC*,** ..............................        62,221,160
     610,780    Infonet Services Corp.* ......................        16,032,975
     221,505    Korea Telecom Corp. (ADR)** ..................        16,557,499
     314,731    NTL, Inc.* ...................................        39,262,692
         752    NTT Data Corp.** .............................        17,294,970
     722,087    Sonera Oyj** .................................        49,432,848
   1,184,773    Thus PLC*,** .................................         7,482,353

                                                                     291,001,173

Telephone - Integrated - 3.7%
       1,157    Nippon Telegraph & Telephone Corp.** .........        19,815,522
   6,160,543    Telefonica S.A.*,** ..........................       153,698,155
     159,671    Telefonica S.A. (ADR)*,** ....................        12,584,071
     555,375    Telefonos de Mexico S.A. (ADR) ...............        62,479,687

                                                                     248,577,435

Therapeutics - 0.1%
     155,150    QLT PhotoTherapeutics, Inc.*,** ..............         9,115,062

Transportation - Air Freight - 0.7%
   1,554,230    TNT Post Group N.V.** ........................        44,483,151

Wire and Cable Products - 0%
      98,000    Furukawa Electric Co., Ltd.** ................         1,486,592

Wireless Equipment - 0.2%
     190,275    RF Micro Devices, Inc.* ......................        13,021,945
- --------------------------------------------------------------------------------
Total Common Stock (cost $3,001,336,806) .....................     5,925,468,256
- --------------------------------------------------------------------------------
Preferred Stock - 1.6%
Automotive - Cars and Light Trucks - 0.5%
      11,997    Porsche A.G.** ...............................    $   32,827,631

Telephone - Integrated - 1.1%
     561,295    Telecomunicacoes Brasileiras S.A. (ADR) ......        72,126,407
- --------------------------------------------------------------------------------
Total Preferred Stock (cost $80,138,903) .....................       104,954,038
- --------------------------------------------------------------------------------
Repurchase Agreement - 6.1%
$406,300,000    Deutsche Bank Securities, Inc., 4.55%
                  dated 12/31/99, maturing 1/3/00, to be
                  repurchased at $406,454,055 collateralized
                  by $106,209,888 in Fannie Mae, 4.005%-
                  7.00%, 11/18/15-5/25/29; $445,394,573
                  in Freddie Mac, 0%-7.3262%, 12/15/12-
                  4/1/29; with respective values of
                  $76,957,925 and $337,468,075
                  (cost $406,300,000) ........................       406,300,000
- --------------------------------------------------------------------------------
U.S. Government Agencies - 1.9%
                Fannie Mae
  50,000,000      5.51%, 2/2/00 ..............................        49,755,111
                Federal Home Loan Bank System
  25,000,000      5.53%, 1/18/00 .............................        24,934,597
                Freddie Mac
  50,000,000      5.51%, 1/28/00 .............................        49,794,875
- --------------------------------------------------------------------------------
Total U.S. Government Agencies (amortized cost $124,484,583) .       124,484,583
- --------------------------------------------------------------------------------
U.S. Government Obligation - 0.7%
                U.S. Treasury Bill
  50,000,000      4.615%, 5/25/00 (cost $49,036,354) .........        48,935,000
- --------------------------------------------------------------------------------
Total Investments (total cost $3,661,296,646) - 99.1% ........     6,610,141,877
- --------------------------------------------------------------------------------
Cash, Receivables and Other Assets, net of Liabilities - 0.9%         61,029,690
- --------------------------------------------------------------------------------
Net Assets - 100% ............................................    $6,671,171,567
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

                                      Janus Aspen Series / December 31, 1999  19
<PAGE>

Janus | Aspen Worldwide Growth Portfolio

Summary of Investments by Country, December 31, 1999

Country                        % of Investment Securities          Market Value
- --------------------------------------------------------------------------------
Bermuda                                    1.2%                   $   80,710,720
Brazil                                     1.3%                       87,875,946
Canada                                     2.8%                      184,496,958
Finland                                    7.3%                      483,706,849
France                                     3.6%                      236,047,267
Germany                                    4.0%                      260,670,312
Hong Kong                                  3.6%                      239,895,054
Israel                                     0.6%                       36,462,675
Italy                                      1.2%                       79,053,979
Japan                                     14.6%                      967,389,294
Mexico                                     1.6%                      106,415,966
Netherlands                                5.6%                      371,847,731
Norway                                     0.1%                        5,618,470
South Korea                                0.3%                       16,557,499
Spain                                      3.0%                      201,005,769
Sweden                                     3.4%                      223,569,374
Switzerland                                0.7%                       48,881,242
United Kingdom                             6.9%                      454,249,116
United States++                           38.2%                    2,525,687,656
- --------------------------------------------------------------------------------
Total                                    100.0%                   $6,610,141,877

++Includes Short-Term Securities (29.4% excluding Short-Term Securities)

Forward Currency Contracts, Open at December 31, 1999

Currency Sold                  and Currency            Currency       Unrealized
Settlement Date                  Units Sold     Value in $ U.S.      Gain/(Loss)
- --------------------------------------------------------------------------------
British Pound 4/7/00             32,000,000       $  51,760,000      $   112,758
British Pound 4/20/00             1,000,000           1,617,500            6,260
British Pound 6/9/00             46,000,000          74,386,600          188,720
Canadian Dollar 4/7/00           10,400,000           7,212,205         (85,394)
Canadian Dollar 5/18/00           2,300,000           1,596,558         (21,215)
Euro 4/7/00                     221,000,000         224,160,300        3,525,495
Euro 4/14/00                     93,200,000          94,579,360        6,076,640
Euro 4/20/00                     30,000,000          30,456,000        2,556,000
Euro 6/2/00                      63,900,000          65,062,980        1,904,220
Euro 6/9/00                      50,000,000          50,935,000          410,654
Hong Kong Dollar
  5/7/01                        761,000,000          97,208,916      (1,177,528)
Hong Kong Dollar
  5/10/01                       509,000,000          65,018,841        (236,216)
Japanese Yen 3/16/00          1,100,000,000          10,897,304           81,069
Japanese Yen 4/7/00           5,500,000,000          54,680,339      (1,279,012)
Japanese Yen 4/14/00          4,600,000,000          45,786,133      (1,212,490)
Japanese Yen 4/20/00          1,950,000,000          19,428,793        (437,753)
Japanese Yen 5/18/00          3,150,000,000          31,532,573        (890,550)
Japanese Yen 6/2/00           3,000,000,000          30,106,879        (895,584)
South Korean Won
  7/16/01                     2,750,000,000           2,399,651        (104,158)
Swiss Franc 4/20/00               2,500,000           1,592,560            3,253
Swiss Franc 6/2/00                9,500,000           6,082,336          163,555
- --------------------------------------------------------------------------------
Total                                             $ 966,500,828      $ 8,688,724

See Notes to Schedules of Investments.

20  Janus Aspen Series / December 31, 1999
<PAGE>

                                                Janus | Aspen Balanced Portfolio

[PHOTO]
Blaine Rollins
portfolio manager

Janus Aspen Balanced  Portfolio gained 26.76% for its  Institutional  Shares and
26.13% for its  Retirement  Shares for the fiscal year ended  December 31, 1999,
outperforming  the S&P 500  Index,  which  appreciated  21.03%,  and the  Lehman
Brothers Government/Corporate Bond Index, which declined (2.15)%.(1) This strong
performance earned the Portfolio a top-decile ranking,  placing it 2nd out of 60
balanced  portfolios  tracked by Lipper,  Inc.,  a leading  mutual  fund  rating
company.(2)

During the year, the equity markets soared to all-time highs - albeit with a few
bumps along the way - as the U.S. economy,  powered by strong consumer spending,
continued to steam ahead at a  record-breaking  pace.  In an effort to douse the
overheating economy and keep inflation in check, the Federal Reserve intervened,
raising  short-term  interest  rates  three  times.  These  preemptive  actions,
however,  only served to further  depress  the bond  markets,  whose  lackluster
performance was the worst in five years. Against this backdrop,  the Portfolio's
fixed-income   position,   which   constitutes   about  half  of  our  holdings,
underperformed.  Our intermediate-maturity  Treasury and corporate bond holdings
were especially  hard hit due to their  sensitivity to rising interest rates. On
the plus side, we selectively  added attractive  high-yield  instruments,  which
helped boost yield.

This  uncertain  economic  environment  presented  special  challenges  for  our
outstanding team of research analysts,  who were more than up to the task. Their
countless  hours spent poring over financial data and weeks on the road visiting
our companies in person helped us achieve impressive gains,  specifically in the
technology, wireless communications and retailing industries.

Focusing on the Portfolio's holdings, the Internet is a fast-moving, high-growth
area that  continues  to  reward us with  extraordinary  results.  Although  the
Portfolio has a conservative bent, we were able to capitalize on advancements in
Web  technology  by  investing  in  solid  brand-name  franchises  such as Cisco
Systems.  Cisco  controls more than 75% of the global market for the routers and
switches  that link computer  networks and power the  Internet.  On top of that,
Cisco is turning its attention to tele-communications  networking,  which allows
digital,  voice  and  video  data -  infinitely  more  information  than  can be
supported by a traditional  copper wire system - to be carried over  fiber-optic
networks. With more and more companies upgrading their internal data networks to
remain competitive, we're confident Cisco is positioned to benefit.

Like Cisco,  long-time  holding  Nokia and new  additions  VoiceStream  Wireless
(through Omnipoint  convertible  preferred stock) and Nextel Communications fall
into  the  category  of   "productivity   enablers."   In  other  words,   these
forward-thinking  businesses  offer  products and services  designed to increase
output and  enhance  efficiency.  One example is the newly  introduced  wireless
application  protocol (WAP) that allows users to surf the Web via their cellular
phones.  With all signs pointing to continued  explosive  growth in wireless and
our holdings in particular, we remain extremely optimistic going forward.

Although  there has been  considerable  talk lately about how the Internet  will
impact retailing in the future,  much of it predicting the demise of traditional
"brick and mortar"  retailers,  Home Depot and Costco  continue to be  excellent
performers for us. Home Depot recently  launched Expo Design Center,  a one-stop
home remodeling center, in a dozen locations across the U.S. Expo lets customers
choose from a wide variety of home  redecorating  products and then arranges for
the installation at very affordable  prices.  As new stores open nationwide,  we
believe that more and more people will be attracted to this innovative  concept.
Costco,  too, is benefiting from steady customer  growth.  The company's  volume
discount  pricing and its strong  membership  tie to customers  have combined to
insulate Costco from Web-based competitors.  Given these positive factors, we're
upbeat about the long-term potential for both businesses.

While we were pleased with our overall  performance,  a few companies  failed to
meet our expectations.  An extremely  competitive price environment put downward
pressure on auto insurers Mutual Risk  Management and  Progressive  Corporation,
and we  sold  both  equity  positions  at a  loss.  Another  disappointment  was
automotive supplier Federal-Mogul.  Lack of demand in the auto parts aftermarket
and increased  competition from Internet  supplier  exchanges caused earnings to
fall, and we liquidated the stock to redeploy our assets in other areas.

To wrap up, I want to stress  that,  as  always,  we are  committed  to  finding
companies that are growing their top line and improving returns on capital, with
superior  management teams dedicated to adding  shareholder value. This strategy
will also guide former assistant  portfolio  manager Karen L. Reidy, who assumed
management  responsibilities for the Portfolio at year-end.  Karen has proven to
be an  indispensable  team  member  in the  past,  and  we're  confident  in her
abilities to successfully steer the Portfolio in the future.

Thank you for investing in Janus Aspen Balanced Portfolio.

Portfolio Asset Mix              December 31, 1999        December 31, 1998
- --------------------------------------------------------------------------------
Equities                                     37.9%                    41.1%
Number of Stocks                                48                       52
Top 10 Equities/Preferred
  (% of Assets)                              21.7%                    32.1%
Fixed-Income Securities                         84                       45
  U.S. Treasury Bonds                        13.1%                     6.8%
  Investment-Grade
    Corporate Bonds                          21.8%                     9.5%
  High-Yield/High-Risk
    Corporate Bonds                          11.6%                    13.6%
Preferred Stock                              10.6%                    19.2%
Cash & Cash Equivalents                       5.0%                     9.8%
- --------------------------------------------------------------------------------

(1)  All returns include reinvested dividends.

(2)  Lipper,  Inc.  defines a balanced  portfolio as "a portfolio  whose primary
     objective is to conserve  principal by  maintaining at all times a balanced
     portfolio of both stocks and bonds.  Typically the stock/bond  ratio ranges
     around  60%/40%." As of December 31, 1999,  Janus Aspen Balanced  Portfolio
     ranked 1/25 for the 5-year period. The ranking is for Institutional  Shares
     and based on total return,  including reinvestment of dividends and capital
     gains for the stated period.

Past performance does not guarantee future results.

                                      Janus Aspen Series / December 31, 1999  21
<PAGE>

Average Annual Total Return(1)
For the Periods Ended December 31, 1999
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 9/13/93)
  1 Year                                                     26.76%
  5 Year                                                     24.68%
  From Inception                                             20.62%
- --------------------------------------------------------------------------------
Lehman Brothers Govt./Corp. Bond Index
  1 Year                                                    (2.15)%
  5 Year                                                      7.61%
  From Inception Date of Institutional Shares                 5.40%
- --------------------------------------------------------------------------------
S&P 500 Index
  1 Year                                                     21.03%
  5 Year                                                     28.54%
  From Inception Date of Institutional Shares                22.68%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                     26.13%
  5 Year                                                     23.98%
  From Portfolio Inception                                   19.82%
- --------------------------------------------------------------------------------
Returns shown for  Retirement  Shares for periods  prior to their  inception are
derived from the historical  performance of  Institutional  Shares,  adjusted to
reflect the higher operating expenses of Retirement Shares.

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)

Average Annual Total Return
for the periods ended December 31, 1999
One Year, 26.76%
Five Year, 24.68%
Since 9/13/93,* 20.62%

[GRAPHIC OMITTED]

A graphic comparison of the change in value of a hypothetical $10,000 investment
in Janus Aspen Balanced  Portfolio - Institutional  Shares,  the Lehman Brothers
Govt./Corp.  Bond Index and the S&P 500 Index.  Janus Aspen Balanced Portfolio -
Institutional  Shares  is  represented  by a shaded  area of green.  The  Lehman
Brothers  Govt./Corp.  Bond Index is  represented by a solid black line. The S&P
500 Index is  represented  by a solid gray 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, 1999. The lower right quadrant reflects
the  ending  value  of the  hypothetical  investment  in  Janus  Aspen  Balanced
Portfolio -  Institutional  Shares  ($32,575) as compared to the Lehman Brothers
Govt./Corp. Bond Index ($13,928) and the S&P 500 Index ($36,243).

Janus Aspen Balanced Portfolio
- - Institutional Shares - $32,575

Lehman Brothers Govt./Corp. Bond Index  - $13,928

S&P 500 Index - $36,243

*The Portfolio's inception date.
Source - Lipper, Inc. 1999.

(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  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 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. Past performance does not guarantee future results.

SCHEDULE OF INVESTMENTS

Shares or Principal Amount                                          Market Value
================================================================================
Common Stock - 37.9%
Audio and Video Products - 0.3%
     111,460    Gemstar International Group, Ltd.* ...........    $    7,941,525

Brewery - 0.2%
      67,790    Anheuser-Busch Companies, Inc. ...............         4,804,616

Broadcast Services and Programming - 1.7%
     756,730    AT&T Corp./Liberty Media Group - Class A* ....        42,944,428

Cable Television - 1.4%
     684,065    Comcast Corp. - Special Class A ..............        34,374,266

Cellular Telecommunications - 1.6%
     156,720    Nextel Communications, Inc. - Class A* .......        16,161,750
     243,265    Sprint Corp./PCS Group* ......................        24,934,663

                                                                      41,096,413

Circuits - 1.3%
     202,480    Linear Technology Corp. ......................        14,489,975
     376,700    Maxim Integrated Products, Inc.* .............        17,775,531

                                                                      32,265,506

Commercial Services - 0.4%
     244,297    Paychex, Inc. ................................         9,771,880

Computer Data Security - 1.0%
     125,200    VeriSign, Inc.* ..............................        23,905,375

Computers - Memory Devices - 1.7%
     386,905    EMC Corp.* ...................................        42,269,371

Cruise Lines - 0.5%
     256,260    Royal Caribbean Cruises, Ltd. ................        12,636,821

Data Processing and Management - 1.1%
     490,275    Automatic Data Processing, Inc. ..............    $   26,413,566

Distribution and Wholesale - 0.4%
     117,225    Costco Wholesale Corp.* ......................        10,696,781

Diversified Financial Services - 0.9%
     388,255    Citigroup, Inc. ..............................        21,572,418

Diversified Operations - 3.3%
     541,170    General Electric Co. .........................        83,746,058

Electronic Components - Semiconductors - 1.1%
     277,630    Texas Instruments, Inc. ......................        26,895,406

Finance - Credit Card - 1.1%
     169,150    American Express Co. .........................        28,121,188

Finance - Investment Bankers/Brokers - 1.0%
     640,935    Charles Schwab Corp. .........................        24,595,881

Internet Software - 0.3%
      60,885    Phone.com, Inc.* .............................         7,058,855

Life and Health Insurance - 1.3%
   1,621,760    Prudential PLC** .............................        31,957,494

Medical - Biomedical and Genetic - 1.2%
     219,390    Genentech, Inc.* .............................        29,507,955

Medical - Drugs - 1.1%
     336,710    King Pharmaceuticals, Inc.* ..................        18,876,804
     234,545    Schering-Plough Corp. ........................         9,894,867

                                                                      28,771,671

See Notes to Schedules of Investments.

22  Janus Aspen Series / December 31, 1999
<PAGE>

SCHEDULE OF INVESTMENTS (continued)

Shares or Principal Amount                                          Market Value
================================================================================
Money Center Banks - 0.5%
     288,505    Bank of New York Company, Inc. ...............    $   11,540,200

Multi-Line Insurance - 0.7%
     167,425    American International Group, Inc. ...........        18,102,828

Multimedia - 2.4%
   1,002,690    Viacom, Inc. - Class B* ......................        60,600,077

Music/Clubs - 0.5%
     362,325    SFX Entertainment, Inc.* .....................        13,111,636

Networking Products - 1.3%
     309,046    Cisco Systems, Inc.* .........................        33,106,553

Optical Supplies - 0.3%
     128,665    Allergan, Inc. ...............................         6,401,084

Radio - 1.9%
     241,480    Hispanic Broadcasting Corp.* .................        22,268,984
     705,175    Infinity Broadcasting Corp. - Class A* .......        25,518,520

                                                                      47,787,504

Retail - Building Products - 1.2%
     439,741    Home Depot, Inc. .............................        30,149,742

Retail - Computer Equipment - 0.4%
     263,310    Insight Enterprises, Inc.* ...................        10,696,969

Retail - Office Supplies - 0.7%
     832,640    Staples, Inc.* ...............................        17,277,280

Retail - Restaurants - 0.4%
     277,405    McDonald's Corp. .............................        11,182,889

Super-Regional Banks - 0.1%
     102,460    Firstar Corp. ................................         2,164,468

Telecommunication Equipment - 2.6%
     217,685    Lucent Technologies, Inc. ....................        16,285,559
     236,848    Nokia Oyj ....................................        45,001,120
      24,802    Nokia Oyj (ADR) ..............................         4,491,146

                                                                      65,777,825

Telephone - Integrated - 1.1%
     998,277    Telefonica S.A.* .............................        24,905,813
      22,855    Telefonica S.A. (ADR)* .......................         1,801,260

                                                                      26,707,073

Television - 0.9%
     231,873    Univision Communications, Inc. - Class A* ....        23,694,522
- --------------------------------------------------------------------------------
Total Common Stock (cost $660,283,448) .......................       949,648,124
- --------------------------------------------------------------------------------
Corporate Bonds - 31.2%
Advertising Sales - 0.6%
$ 10,150,000    Lamar Advertising Co., 5.25%
                  convertible notes, due 9/15/06 .............        14,793,625

Beverages - Non-Alcoholic - 0.8%
  20,700,000    Coca-Cola Enterprises, Inc., 7.125%
                  notes, due 9/30/09 .........................        20,311,875

Brewery - 0.7%
                Anheuser-Busch Companies, Inc.:
   5,100,000      5.65%, notes, due 9/15/08 ..................         4,551,750
  14,100,000      5.75%, notes, due 4/1/10 ...................        12,460,875

                                                                      17,012,625

Broadcast Services and Programming - 1.0%
  26,300,000    AT&T Corp./Liberty Media Group, 7.875%
                  notes, due 7/15/09+ ........................        26,102,750

Cable Television - 6.6%
                Adelphia Communications Corp.:
$ 10,145,000      9.25%, senior notes, due 10/1/02 ...........    $   10,170,362
   7,055,000      10.50%, senior notes, due 7/15/04 ..........         7,363,656
  10,158,000      8.375%, senior notes, due 2/1/08 ...........         9,446,940
  25,000,000      7.875%, senior notes, due 5/1/09 ...........        22,500,000
   1,500,000    Century Communications Corp., 8.875%
                  senior notes, due 1/15/07 ..................         1,466,250
  31,510,000    Charter Communications Holdings L.L.C.
                  8.625%, senior notes, due 4/1/09 ...........        29,146,750
                Cox Communications, Inc.:
  11,500,000      7.00%, notes, due 8/15/01 ..................        11,456,875
  13,750,000      7.50%, notes, due 8/15/04 ..................        13,664,063
   9,500,000      7.75%, notes, due 8/15/06 ..................         9,571,250
  10,600,000      7.875%, notes, due 8/15/09 .................        10,732,500
  10,000,000    Falcon Holding Group L.P., 8.375%
                  debentures, due 4/15/10 ....................        10,075,000
   6,000,000    FrontierVision Holdings L.P., 11.00%
                  senior subordinated notes, due 10/15/06 ....         6,360,000
  11,205,000    Jones Intercable, Inc., 7.625%
                  senior notes, due 4/15/08 ..................        11,120,962
   3,000,000    Lenfest Communications, Inc., 7.625%
                  senior notes, due 2/15/08 ..................         2,996,250
                Mediacom L.L.C.:
   6,000,000      8.50%, senior notes, due 4/15/08 ...........         5,625,000
   3,750,000      7.875%, senior notes, due 2/15/11 ..........         3,309,375

                                                                     165,005,233

Cellular Telecommunications - 1.6%
  10,318,000    Orange PLC, 8.00%
                  senior notes, due 8/1/08 ...................        10,472,770
   5,675,000    Vodafone AirTouch PLC, 6.65%
                  notes, due 5/1/08 ..........................         5,327,406
  24,000,000    VoiceStream Wireless Co., 10.375%
                  senior notes, due 11/15/09+ ................        24,660,000

                                                                      40,460,176

Chemicals - Diversified - 0.3%
   7,700,000    E.I. du Pont de Nemours and Co., 6.75%
                  notes, due 10/15/04 ........................         7,603,750

Commercal Banks - 0.2%
   5,500,000    First Union National Bank, 5.80%
                  subordinated notes, due 12/1/08 ............         4,812,500

Computers - Micro - 1.6%
   7,900,000    Dell Computer Corp., 6.55%
                  senior notes, due 4/15/08 ..................         7,386,500
   9,025,000    EMC Corp., 6.00%
                  convertible subordinated notes, due 5/15/04         12,352,969
                IBM Corp.:
   2,000,000      6.375%, notes, due 6/15/00 .................         2,002,500
   8,395,000      5.375%, notes, due 2/1/09 ..................         7,377,106
  11,900,000    Sun Microsystems, Inc., 7.65%
                  senior notes, due 8/15/09 ..................        11,855,375

                                                                      40,974,450

Cosmetics and Toiletries - 0.3%
   8,000,000    Procter and Gamble Co., 5.25%
                  notes, due 9/15/03 .........................         7,580,000

Cruise Lines - 0.3%
                Carnival Corp., 6.15%
   1,500,000      notes, due 4/15/08 .........................         1,350,000
                Royal Caribbean Cruises, Ltd.:
   6,350,000      7.00%, senior notes, due 10/15/07 ..........         5,961,063
     739,000      6.75%, senior notes, due 3/15/08 ...........           678,033

                                                                       7,989,096

See Notes to Schedules of Investments.

                                      Janus Aspen Series / December 31, 1999  23
<PAGE>

Janus | Aspen Balanced Portfolio

SCHEDULE OF INVESTMENTS (continued)

Shares or Principal Amount                                          Market Value
================================================================================
Diversified Financial Services - 0.1%
$  2,000,000    Associates Corp. N.A., 6.75%
                  senior notes, due 7/15/01 ..................    $    1,997,500

Diversified Operations - 0.5%
  13,750,000    Tyco International Group S.A., 6.875%
                  notes, due 9/5/02+ .........................        13,526,562

Enterprise Software and Services - 0.2%
   5,296,000    BEA Systems, Inc., 4.00%
                  convertible subordinated notes
                  due 12/15/06+ ..............................         6,176,460

Fiber Optics - 0.2%
   6,000,000    Metromedia Fiber Networks, Inc., 10.00%
                  senior notes, due 12/15/09 .................         6,165,000

Finance - Auto Loans - 0.2%
   1,650,000    Ford Motor Credit Co., 5.80%
                  senior notes, due 1/12/09 ..................         1,466,438
   3,327,000    General Motors Acceptance Corp., 5.85%
                  senior unsubordinated notes, due 1/14/09 ...         2,948,554

                                                                       4,414,992

Food - Canned - 0.2%
   4,500,000    Campbell Soup Co., 4.75%
                  notes, due 10/1/03 .........................         4,168,125

Food - Retail - 0.4%
   8,000,000    Fred Meyer, Inc., 7.45%
                  company guaranteed notes, due 3/1/08 .......         7,790,000
   3,500,000    Safeway, Inc., 6.50%
                  notes, due 11/15/08 ........................         3,224,375

                                                                      11,014,375

Internet Software - 1.3%
                Exodus Communications, Inc.:
   2,631,000      11.25%, senior notes, due 7/1/08 ...........         2,729,663
  12,250,000      4.75%, convertible subordinated notes
                  due 7/15/08+ ...............................        16,920,313
  11,660,000    PSINet, Inc., 11.00%
                  senior notes, due 8/1/09 ...................        12,038,950

                                                                      31,688,926

Leisure, Recreation and Gaming - 0.1%
   2,324,000    Hard Rock Hotel, Inc., 9.25%
                  senior subordinated notes, due 4/1/05 ......         1,690,710

Life and Health Insurance - 0.3%
   7,000,000    AFLAC, Inc., 6.50%
                  senior notes, due 4/15/09 ..................         6,422,500
   1,000,000    SunAmerica, Inc., 6.75%
                  notes, due 10/1/07 .........................           961,250
                                                                       7,383,750
Medical - Drugs - 0.1%
   3,000,000    Warner-Lambert Co., 6.00%
                  notes, due 1/15/08 .........................         2,763,750

Money Center Banks - 0.4%
  10,800,000    HSBC Holdings PLC, 7.50%
                  subordinated notes, due 7/15/09 ............        10,651,500

Multimedia - 2.2%
$  4,500,000    News America, Inc., 6.625%
                  senior notes, due 1/9/08 ...................    $    4,168,125
  11,640,000    Paramount Communications, Inc., 7.50%
                  debentures, due 7/15/23 ....................        10,272,300
  10,300,000    Time Warner, Inc., 8.11%
                  notes, due 8/15/06 .........................        10,531,750
                Viacom, Inc.:
  19,371,000      7.75%, senior notes, due 6/1/05 ............        19,540,496
     641,000      7.625%, company guaranteed notes
                  due 1/15/16 ................................           624,975
                Walt Disney Co. (The):
   2,000,000      6.375%, senior notes, due 3/30/01 ..........         1,990,000
   6,500,000      6.75%, senior notes, due 3/30/06 ...........         6,329,375

                                                                      53,457,021

Property and Casualty Insurance - 0.2%
   6,900,000    Progressive Corp., 6.625%
                  senior notes, due 3/1/29 ...................         5,692,500

Radio - 0.4%
   6,659,000    Clear Channel Communications, Inc., 2.625%
                  convertible senior notes, due 4/1/03 .......         9,846,996

Retail - Building Products - 0.8%
  20,000,000    Home Depot, Inc., 6.50%
                  notes, due 9/15/04+ ........................        19,550,000

Retail - Discount - 1.6%
                Wal-Mart Stores, Inc.:
   9,850,000      6.15%, senior notes, due 8/10/01 ...........         9,763,812
   9,500,000      6.55%, senior notes, due 8/10/04 ...........         9,333,750
  21,000,000      6.875%, senior notes, due 8/10/09 ..........        20,448,750

                                                                      39,546,312

Retail - Restaurants - 0.1%
                McDonald's Corp.:
   3,000,000      6.50%, notes, due 8/1/07 ...................         2,876,250
     500,000      5.35%, senior notes, due 9/15/08 ...........           438,125

                                                                       3,314,375

Super-Regional Banks - 0.8%
  16,000,000    Firstar Bank, 7.125%
                  subordinated notes, due 12/1/09 ............        15,460,000
   5,450,000    Northern Trust Corp., 7.10%
                  subordinated notes, due 8/1/09 .............         5,293,313

                                                                      20,753,313

Telecommunication Equipment - 0.5%
  14,500,000    Lucent Technologies, Inc., 5.50%
                  notes, due 11/15/08 ........................        12,886,875

Telecommunication Services - 2.1%
   6,845,000    Galaxy Telecom L.P., 12.375%
                  senior subordinated notes, due 10/1/05 .....         7,272,813
  14,723,000    NTL, Inc., 7.00%
                  convertible subordinated notes
                  due 12/15/08+ ..............................        38,868,720
   5,850,000    Versatel Telecom B.V., 11.875%
                  senior notes, due 7/15/09 ..................         5,967,000

                                                                      52,108,533

Telephone - Long Distance - 1.2%
  31,800,000    AT&T Corp., 6.00%
                  notes, due 3/15/09 .........................        28,898,250

See Notes to Schedules of Investments.

24  Janus Aspen Series / December 31, 1999
<PAGE>

Shares or Principal Amount                                          Market Value
================================================================================
Wireless Equipment - 3.3%
                Nextel Communications, Inc.:
$ 25,342,000      9.75%, senior discount notes, due 8/15/04 ..    $   26,165,615
  10,100,000      4.75%, convertible senior notes, due 7/1/07+        22,863,875
  33,000,000      9.375%, senior notes, due 11/15/09+ ........        32,422,500

                                                                      81,451,990
- --------------------------------------------------------------------------------
Total Corporate Bonds (cost $766,798,105) ....................       781,793,895
- --------------------------------------------------------------------------------
Foreign Bonds - 2.2%
Cable Television - 1.1%
GBP
  14,680,000    Telewest Communications PLC, 5.25%
                  convertible bonds, due 2/19/07**,+ .........        27,267,806

Finance - Other Services - 0.2%
EUR
   4,400,000    Ono Finance PLC, 13.00%
                  company guaranteed notes, due 5/1/09+ ......         4,559,192

Telecommunication Services - 0.9%
EUR
   4,563,000    COLT Telecom Group PLC, 2.00%
                  convertible bonds, due 3/29/06+ ............        10,902,147
GBP
  13,950,000    NTL, Inc., 9.75%
                  senior notes, due 4/15/09** ................        12,899,592

                                                                      23,801,739
- --------------------------------------------------------------------------------
Total Foreign Bonds (cost $47,436,797) .......................        55,628,737
- --------------------------------------------------------------------------------
Preferred Stock - 10.6%
Cable Television - 5.9%
     371,500    Comcast Corp., convertible, 2.00%
                  (Sprint Corp./PCS Group) ...................        35,292,500
     505,750    Cox Communications, Inc., convertible, 7.00% .        34,391,000
     641,505    Reliant Energy, Inc., convertible, 7.00%
                  (Time Warner, Inc.) ........................        77,301,353

                                                                     146,984,853

Cruise Lines - 1.6%
     282,652    Royal Caribbean Cruises, Ltd.
                  convertible, 7.25% .........................        40,136,584

Telecommunication Services - 3.1%
     394,891    Omnipoint Corp., convertible, 7.00%
                  (VoiceStream Wireless Corp.) ...............        77,744,166
- --------------------------------------------------------------------------------
Total Preferred Stock (cost $191,966,665) ....................       264,865,603
- --------------------------------------------------------------------------------
Warrants - 0%
Finance - Other Services - 0%
       4,400    Ono Finance PLC - expires 5/31/09*,+
                  (cost $0) ..................................           486,904
- --------------------------------------------------------------------------------
U.S. Government Obligations - 13.1%
                U.S. Treasury Notes:
$ 75,000,000      5.875%, due 11/30/01 .......................        74,496,000
 181,275,000      5.875%, due 11/15/04 .......................       177,662,189
  79,100,000      6.00%, due 8/15/09 .........................        76,631,289
- --------------------------------------------------------------------------------
Total U.S. Government Obligations (cost $335,267,836) ........       328,789,478
- --------------------------------------------------------------------------------
Repurchase Agreement - 2.0%
$ 51,100,000    Deutsche Bank Securities, Inc., 4.55%
                  dated 12/31/99, maturing 1/3/00, to be
                  repurchased at $51,119,375 collateralized
                  by $13,357,926 in Fannie Mae, 4.005%-
                  7.00%, 11/18/15-5/25/29; $56,016,891
                  in Freddie Mac, 0%-7.3262%, 12/15/12-
                  4/1/29; with respective values of
                  $9,678,932 and $42,443,068
                  (cost $51,100,000) .........................    $   51,100,000
- --------------------------------------------------------------------------------
Total Investments (cost $2,052,852,851) - 97.0% ..............     2,432,312,741
- --------------------------------------------------------------------------------
Cash, Receivables and Other Assets, net of Liabilities - 3.0%         74,364,076
- --------------------------------------------------------------------------------
Net Assets - 100% ............................................    $2,506,676,817
- --------------------------------------------------------------------------------

Summary of Investments by Country, December 31, 1999

Country                        % of Investment Securities          Market Value
- --------------------------------------------------------------------------------
Bermuda                                    0.6%                   $   13,526,562
Finland                                    2.0%                       49,492,266
Netherlands                                0.2%                        5,967,000
Spain                                      1.1%                       26,707,073
United Kingdom                             4.0%                       96,297,813
United States++                           92.1%                    2,240,322,027
- --------------------------------------------------------------------------------
Total                                    100.0%                   $2,432,312,741

++Includes Short-Term Securities (90.0% excluding Short-Term Securities)

Forward Currency Contracts, Open at December 31, 1999

Currency Sold and                  Currency            Currency       Unrealized
Settlement Date                  Units Sold     Value in $ U.S.      Gain/(Loss)
- --------------------------------------------------------------------------------
British Pound 4/7/00              8,800,000       $  14,234,000      $   311,672
British Pound 4/20/00             4,500,000           7,278,750          192,598
- --------------------------------------------------------------------------------
Total                                             $  21,512,750      $   504,270

See Notes to Schedules of Investments.

                                      Janus Aspen Series / December 31, 1999  25
<PAGE>

Janus | Aspen Equity Income Portfolio

[PHOTO]
Blaine Rollins
portfolio manager

For the fiscal year ended December 31, 1999, Janus Aspen Equity Income Portfolio
gained 41.58% for its Institutional Shares and 40.94% for its Retirement Shares,
comparing  favorably  with its  benchmark  index,  the S&P 500,  which  returned
21.03%.(1) This strong  performance  earned the Portfolio a top-decile  ranking,
placing it 2nd out of 41 equity  income  portfolios  tracked by Lipper,  Inc., a
leading mutual fund rating company.(2)

Although  equity market indexes reached  all-time highs during the year,  driven
primarily by  technology  stocks,  investors  still  experienced a bumpy ride as
ongoing concerns about an overheating  economy fueled fears of rising inflation.
As the jobless rate continued to hover near historical lows and wages threatened
to creep higher, three Federal Reserve  interest-rate hikes did little to slow a
robust U.S. economy powered by strong consumer  spending.  Surprisingly,  equity
markets remained narrow, and many blue-chip names  underperformed.  Even so, our
hands-on research uncovered a number of outstanding  companies,  particularly in
the wireless telecommunications,  cable and media industries. On the other hand,
the Fed's actions negatively  impacted the bond market,  which endured its worse
year since 1994. Therefore,  we opportunistically  added high-yield fixed-income
investments to enhance yield and deploy excess cash.

Turning to a detailed  discussion  of the  Portfolio's  holdings,  "productivity
enabler"  is a label we apply to  businesses  that are  finding new ways to help
customers improve their output and efficiency.  Our wireless  telecommunications
stocks  certainly  fall  into  this  category.  With  worldwide  cellular  phone
penetration  rates  exceeding  all  expectations,  we increased  our position in
market  leader  Nokia and added  VoiceStream  Wireless  (through  the  Omnipoint
convertible preferred stock) and Nextel Communications.

What's  more,  the global  explosion in wireless  has  benefited  not only those
companies,  but  it's  created  a strong  tailwind  for  holdings  such as Texas
Instruments,  Linear  Technology and Maxim  Integrated  Products as well.  Texas
Instruments is the leading  manufacturer of digital signal processors  (DSPs), a
key component of cellular  phones that converts  light,  sound and other signals
into computer  language.  Linear and Maxim make integrated  chips that translate
analog data into digital  information for small electronic devices like cellular
phones.   With  more  and  more  people  going  wireless  and  new  leading-edge
applications  being introduced at a rapid pace, we remain  extremely  optimistic
about the future  prospects  for our  wireless  companies  and the industry as a
whole.

Cable is another  fast-growing  area that helped  boost  performance.  Long-time
holding Time Warner (via the Reliant Energy, Inc.  convertible  preferred stock)
allowed us to  participate  in the upside  movement of Time  Warner's  stock and
achieve an  attractive  yield at the same time.  Other  cable  winners  included
Comcast and Cox  Communications.  Capitalizing  on the growth in networking  and
broadband  telecommunications,   both  of  these  companies  provide  the  vital
pipelines that allow digital  cable,  telephony,  expanded  video  offerings and
high-speed Internet access to be delivered over a single platform. As demand for
these value-added services intensifies,  we're confident our cable holdings will
continue to reward us with exceptional results.

Like Time Warner,  worldwide  entertainment  and media giant Viacom is a play on
both cable and media.  Recently, the company turned its attention toward network
television,  announcing plans to acquire CBS. If the merger is approved, Viacom,
which owns a number of other media properties  including MTV,  Nickelodeon,  VH1
and Paramount  Studios,  will gain valuable access to TV distribution  and radio
via CBS's  Infinity  Broadcasting.  As the number of commuters and commute times
continue to  increase,  Infinity is poised to benefit from a captive and growing
audience.  Given these  positive  factors,  we're  excited  about the  long-term
potential for the combined organization.

Despite our many  successes,  we did  experience a few  setbacks.  Auto insurers
Mutual Risk  Management and Progressive  Corporation  suffered from an extremely
competitive  price  environment,  and we  subsequently  sold both positions at a
loss.  Another  holding  that  failed  to meet our  expectations  is  automotive
supplier  Federal-Mogul.  Ongoing softness in the auto parts aftermarket,  along
with  increased  competition  from  Ford and GM,  which are  creating  their own
Web-based supplier exchanges, combined to depress Federal-Mogul's earnings. As a
result, we decided to liquidate the stock in favor of other compelling ideas.

In closing, I want to reiterate that we are steadfastly  focused,  as always, on
finding  companies  that are  growing  their top line and  improving  returns on
capital,  with  superior  management  teams  committed to adding value for their
shareholders.  As I turn over management  responsibilities  to Karen L. Reidy at
year-end,  our investors can expect a continuation of that same strategy. In her
role as assistant portfolio manager, Karen made significant contributions to our
success. For that reason, we're tremendously confident in her abilities and know
this transition will be a smooth one.

Thank you for investing in Janus Aspen Equity Income Portfolio.

Portfolio Asset Mix              December 31, 1999        December 31, 1998
- --------------------------------------------------------------------------------
Equities                                     64.1%                    61.9%
Number of Stocks                                51                       47
Top 10 Equities/Preferred
  (% of Assets)                              31.8%                    39.2%
Fixed-Income Securities
  Investment-Grade
    Corporate Bonds                             --                       --
  High-Yield/High-Risk
    Corporate Bonds                          14.7%                    12.7%
Preferred Stock                              14.0%                    21.2%
Cash & Cash Equivalents                       7.2%                     4.2%
- --------------------------------------------------------------------------------

(1)  All returns include reinvested dividends.

(2)  Lipper, Inc. defines an equity income portfolio as "a portfolio which seeks
     relatively  high current income and growth of income through  investing 60%
     or more of its  portfolio in  equities."  The ranking is for  Institutional
     Shares and based on total return,  including  reinvestment of dividends and
     capital gains for the stated period.

Past performance does not guarantee future results.

26  Janus Aspen Series / December 31, 1999
<PAGE>

Average Annual Total Return(1)
For the Periods Ended December 31, 1999
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 5/1/97)
  1 Year                                                     41.58%
  From Inception                                             46.87%
- --------------------------------------------------------------------------------
S&P 500 Index
  1 Year                                                     21.03%
  From Portfolio Inception                                   27.40%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                     40.94%
  From Inception                                             46.15%
- --------------------------------------------------------------------------------
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)

Average Annual Total Return
for the periods ended December 31, 1999
One Year, 41.58%
Since 5/1/97,* 46.87%

[GRAPHIC OMITTED]

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 shaded  area of green.  The S&P 500 Index is  represented  by a solid 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, 1999.
The  lower  right  quadrant  reflects  the  ending  value  of  the  hypothetical
investment  in Janus  Aspen  Equity  Income  Portfolio  -  Institutional  Shares
($27,890) as compared to the S&P 500 Index ($19,075).

Janus Aspen Equity Income Portfolio
- - Institutional Shares - $27,890

S&P 500 Index - $19,075

*The Portfolio's inception date.
Source - Lipper, Inc. 1999.

(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  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 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. Past performance does not guarantee future results.

SCHEDULE OF INVESTMENTS

Shares or Principal Amount                                          Market Value
================================================================================
Common Stock - 64.1%
Brewery - 1.0%
       2,790    Anheuser-Busch Companies, Inc. ...............    $      197,741

Broadcast Services and Programming - 2.8%
       9,500    AT&T Corp./Liberty Media Group - Class A* ....           539,125

Cable Television - 3.0%
       9,634    Comcast Corp. - Special Class A ..............           484,109
       1,772    Cox Communications, Inc. - Class A* ..........            91,257

                                                                         575,366

Cellular Telecommunications - 1.0%
       1,970    Nextel Communications, Inc. - Class A* .......           203,155

Circuits - 2.5%
       3,360    Linear Technology Corp. ......................           240,450
       5,315    Maxim Integrated Products, Inc.* .............           250,801

                                                                         491,251

Commercial Banks - 0.4%
       4,145    Carolina First Corp. .........................            75,646

Commercial Services - 0.7%
       3,277    Paychex, Inc. ................................           131,080

Computer Data Security - 0.4%
         405    VeriSign, Inc.* ..............................            77,330

Computer Software - 2.4%
       4,060    Microsoft Corp.* .............................           474,005

Computers - Memory Devices - 2.5%
       4,385    EMC Corp.* ...................................           479,060

Cruise Lines - 0.5%
       2,168    Royal Caribbean Cruises, Ltd. ................           106,910

Data Processing and Management - 2.1%
       7,500    Automatic Data Processing, Inc. ..............    $      404,063

Distribution and Wholesale - 0.9%
       1,975    Costco Wholesale Corp.* ......................           180,219

Diversified Financial Services - 1.0%
       3,440    Citigroup, Inc. ..............................           191,135

Diversified Operations - 3.7%
       4,595    General Electric Co. .........................           711,076

Electronic Components - Semiconductors - 1.0%
       2,035    Texas Instruments, Inc. ......................           197,141

Finance - Credit Card - 2.7%
       3,150    American Express Co. .........................           523,688

Finance - Investment Bankers/Brokers - 1.3%
       6,629    Charles Schwab Corp. .........................           254,388

Finance - Mortgage Loan Banker - 1.0%
       3,145    Fannie Mae ...................................           196,366

Life and Health Insurance - 2.4%
      23,789    Prudential PLC** .............................           468,773

Medical - Biomedical and Genetic - 1.2%
       1,780    Genentech, Inc.* .............................           239,410

Medical - Drugs - 1.6%
       4,405    AstraZeneca Group PLC (ADR)** ................           183,909
       3,080    Schering-Plough Corp. ........................           129,938

                                                                         313,847

Money Center Banks - 0.5%
       2,350    Bank of New York Company, Inc. ...............            94,000

See Notes to Schedules of Investments.

                                      Janus Aspen Series / December 31, 1999  27
<PAGE>

Janus | Aspen Equity Income Portfolio


SCHEDULE OF INVESTMENTS (continued)

Shares or Principal Amount                                          Market Value
================================================================================
Multi-Line Insurance - 1.5%
       2,715    American International Group, Inc. ...........    $      293,559

Multimedia - 3.8%
      12,140    Viacom, Inc. - Class B* ......................           733,711

Networking Products - 2.7%
       4,890    Cisco Systems, Inc.* .........................           523,840

Optical Supplies - 0.7%
       2,880    Allergan, Inc. ...............................           143,280

Pipelines - 2.0%
       8,945    Enron Corp. ..................................           396,934

Radio - 3.1%
       3,335    Hispanic Broadcasting Corp.* .................           307,550
       8,385    Infinity Broadcasting Corp. - Class A* .......           303,432

                                                                         610,982

Retail - Building Products - 2.2%
       6,183    Home Depot, Inc. .............................           423,922

Retail - Computer Equipment - 0.6%
       2,935    Insight Enterprises, Inc.* ...................           119,234

Retail - Office Supplies - 0.6%
       5,305    Staples, Inc.* ...............................           110,079

Retail - Restaurants - 0.9%
       4,205    McDonald's Corp. .............................           169,514

Super-Regional Banks - 0.2%
       1,725    Firstar Corp. ................................            36,441

Telecommunication Equipment - 5.1%
       3,130    Lucent Technologies, Inc. ....................           234,163
         384    Nokia Oyj ....................................            69,535
       3,568    Nokia Oyj (ADR) ..............................           677,920

                                                                         981,618

Telephone - Integrated - 1.1%
       8,176    Telefonica S.A.* .............................           203,981
         205    Telefonica S.A. (ADR)* .......................            16,156

                                                                         220,137

Telephone - Local - 0.5%
       1,215    ALLTEL Corp. .................................           100,465

Television - 2.5%
       4,697    Univision Communications, Inc. - Class A* ....           479,975
- --------------------------------------------------------------------------------
Total Common Stock (cost $8,460,134) .........................        12,468,466
- --------------------------------------------------------------------------------
Corporate Bonds  - 12.9%
Advertising Agencies - 0.1%
$      6,000    Omnicom Group, Inc., 4.25%
                  convertible subordinated debentures
                  due 1/3/07 .................................            19,080

Advertising Sales - 0.9%
     123,000    Lamar Advertising Co., 5.25%
                  convertible notes, due 9/15/06 .............           179,273

Cellular Telecommunications - 0.8%
      20,000    Orange PLC, 9.00%
                  senior notes, due 6/1/09 ...................            21,200
     130,000    VoiceStream Wireless Corp., 10.375%
                  senior notes, due 11/15/09+ ................           133,575

                                                                         154,775

Computers - Memory Devices - 1.1%
     160,000    EMC Corp., 6.00%
                  convertible subordinated notes
                  due 5/15/04 ................................           219,000

Enterprise Software and Services - 1.4%
$     42,000    BEA Systems, Inc., 4.00%
                  convertible subordinated notes
                  due 12/15/06+ ..............................    $       48,983
     150,000    i2 Technologies, Inc., 5.25%
                  convertible subordinated notes
                  due 12/15/06+ ..............................           214,688

                                                                         263,671

Fiber Optics - 0.3%
      50,000    Metromedia Fiber Network, Inc., 10.00%
                  senior notes, due 12/15/09 .................            51,375

Internet Software - 1.4%
     100,000    Exodus Communications, Inc., 4.75%
                  convertible subordinated notes, due 7/15/08+           138,125
     125,000    PSINet, Inc., 11.00%
                  senior notes, due 8/1/091 ..................            29,063

                                                                         267,188

Radio - 1.0%
     137,000    Clear Channel Communications, Inc., 2.625%
                  convertible senior notes, due 4/1/03 .......           202,589

Telecommunication Services - 3.4%
      50,000    Galaxy Telecom L.P., 12.375%
                  senior subordinated notes, due 10/1/05 .....            53,125
     234,000    NTL, Inc., 7.00%
                  convertible subordinated notes
                  due 12/15/08+ ..............................           617,760

                                                                         670,885

Wireless Equipment - 2.5%
                Nextel Communications, Inc.:
     282,000      9.75%, senior discount notes, due 8/15/04 ..           291,165
     197,000      9.375%, senior notes, due 11/15/09+ ........           193,553

                                                                         484,718
- --------------------------------------------------------------------------------
Total Corporate Bonds (cost $2,023,679) ......................         2,512,554
- --------------------------------------------------------------------------------
Foreign Bond - 1.8%
Cable Television - 1.8%
GBP
     183,000    Telewest Communications PLC, 5.25%
                  convertible bonds, due 2/19/07**,+
                  (cost $290,678) ............................           339,919
- --------------------------------------------------------------------------------
Preferred Stock - 14.0%
Automotive - Cars and Light Trucks - 0.9%
          64    Porsche A.G ..................................           175,124

Cable Television - 3.7%
       4,000    Comcast Corp., convertible, 2.00%
                  (Sprint Corp./PCS Group) ...................           380,000
       5,000    Cox Communications, Inc.
                  convertible, 7.00% .........................           340,000

                                                                         720,000

Cruise Lines - 2.0%
       2,700    Royal Caribbean Cruises, Ltd.
                  convertible, 7.25% .........................           383,400

Electric - Integrated - 3.1%
       5,030    Reliant Energy, Inc., convertible, 7.00%
                  (Time Warner, Inc.) ........................           606,115

Telecommunication Services - 4.3%
       4,252    Omnipoint Corp., convertible, 7.00% ..........           837,113
- --------------------------------------------------------------------------------
Total Preferred Stock (cost $2,013,209) ......................         2,721,752
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

28  Janus Aspen Series / December 31, 1999
<PAGE>

Shares or Principal Amount                                          Market Value
================================================================================
Repurchase Agreement - 6.2%
$  1,200,000    Deutsche Bank Securities, Inc., 4.55%
                  dated 12/31/99, maturing 1/3/00, to be
                  repurchased at $1,200,455 collateralized
                  by $313,689 in Fannie Mae, 4.005%-
                  7.00%, 11/18/15-5/25/29; $1,315,465
                  in Freddie Mac, 0%-7.3262%, 12/15/12-
                  4/1/29; with respective values of $227,294
                  and $996,706 (cost $1,200,000) .............    $    1,200,000
- --------------------------------------------------------------------------------
Total Investments (total cost $13,987,700) - 99.0% ...........        19,242,691
- --------------------------------------------------------------------------------
Cash, Receivables and Other Assets, net of Liabilities - 1.0%            196,223
- --------------------------------------------------------------------------------
Net Assets - 100% ............................................    $   19,438,914
- --------------------------------------------------------------------------------

Summary of Investments by Country, December 31, 1999

Country                        % of Investment Securities          Market Value
- --------------------------------------------------------------------------------
Finland                                    3.9%                   $      747,455
Germany                                    0.9%                          175,124
Spain                                      1.1%                          220,137
United Kingdom                             5.3%                        1,013,801
United States++                           88.8%                       17,086,174
- --------------------------------------------------------------------------------
Total                                    100.0%                   $   19,242,691

++Includes Short-Term Securities (82.6% excluding Short-Term Securities)

Forward Currency Contracts, Open at December 31, 1999

Currency Sold and                  Currency            Currency       Unrealized
Settlement Date                  Units Sold     Value in $ U.S.      Gain/(Loss)
- --------------------------------------------------------------------------------
British Pound 4/7/00                125,000       $     202,187      $     3,265
British Pound 4/20/00                15,000              24,263               94
- --------------------------------------------------------------------------------
Total                                             $     226,450      $     3,359

See Notes to Schedules of Investments.

                                      Janus Aspen Series / December 31, 1999  29
<PAGE>

Janus | Aspen Growth and Income Portfolio

[PHOTO]
David Corkins
portfolio manager

I'm pleased to report that for the fiscal year ended  December 31,  1999,  Janus
Aspen  Growth  and Income  Portfolio  appreciated  74.04% for its  Institutional
Shares and 73.20% for its Retirement Shares. These gains substantially  outpaced
the  Portfolio's  benchmark,  the  Standard & Poor's 500 Index,  which  returned
21.03%.(1) They also earned the Portfolio a top-decile  ranking,  placing it 1st
out of 174 growth  and income  portfolios  tracked  by Lipper,  Inc.,  a leading
mutual fund rating company.(2)

Despite  three   short-term   interest   rate  hikes   designed  to  rein  in  a
record-setting  economic expansion,  growth stocks continued to surge ahead this
year,  with some minor  volatility  along the way. On the  downside,  the market
remained narrow as few sectors outside technology  participated in this powerful
growth rally. So while technology,  cable and wireless  communications are still
favorite  Portfolio  themes,  my strategy for managing  volatility is to keep my
feet in two camps:  one in the brand-name  tech  franchises  posting  phenomenal
returns and one in the consistent "steady Eddie" blue-chip stocks the market has
recently ignored in favor of the highfliers.

Either way, the  Portfolio's  emphasis is on growth,  focusing on  well-managed,
high-return  businesses  selling at attractive prices. As always, to balance our
growth-oriented  holdings,  we maintain a smaller  position in  income-producing
investments,   including  dividend-paying  stocks,  convertible  securities  and
high-yield  bonds.  Thanks to the diligent  efforts of our  outstanding  team of
equity and income research analysts, we enjoyed considerable success this year.

Contributing to that success were our cable stocks, in particular,  AT&T Liberty
Media Group.  With media  visionary  and former TCI chairman  John Malone at the
helm,  Liberty Media has created enormous  shareholder value from a conglomerate
of fast-growing cable holdings,  including  Discovery  Channel,  E!, QVC and USA
Networks,  not to mention  numerous  music and online  properties.  What's more,
Liberty  Media owns a stake in Time  Warner,  another  favorite  position in the
Portfolio.  As the company  explores  other  avenues for  investment,  we remain
enthusiastic in our outlook for Liberty Media - and the cable group as a whole.

Wireless communications is another high-growth business that continues to excite
us. With the number of cellular phone subscribers  expected to reach one billion
by the end of 2002 - a year earlier than previously  forecast - the Portfolio is
poised to benefit  from  long-time  holdings  in Nokia and Sprint PCS as well as
newer positions in Nextel Communications and VoiceStream  Wireless.  Not only is
the  global  explosion  in  wireless  aiding  our  companies,   but  so  is  the
introduction of several breakthrough  applications.  For example,  Nokia's rapid
adoption of wireless application protocol (WAP) - a feature that allows users to
access the Internet  from their  cellular  phones - should help drive demand for
its products well into the future.  With these factors in our favor,  we're very
optimistic about the prospects for our wireless holdings going forward.

As mentioned earlier,  to capture the powerful upside growth of technology while
limiting the downside risk inherent in this rapidly evolving industry, we prefer
to invest in  well-known,  established  names such as Microsoft,  America Online
(AOL),  Cisco Systems and Sun Microsystems.  Together with new position Liberate
Technologies,  these  forward-looking,  dynamic companies  significantly boosted
performance.   Backed  by  some   powerful   technology   players   like  Lucent
Technologies,  Sun and AOL, Liberate makes software that will let consumers surf
the Web via their TVs,  cell phones or other  devices.  Even better,  Liberate's
software can be integrated with other operating systems, giving its product more
flexibility  and a  competitive  advantage.  That being the case, we expect this
combination  of new positions  and mainstay  holdings to continue to enhance our
performance in the future.

While our successes far outweighed our disappointments,  some stocks did prove a
drag on performance.  Automotive supplier  Federal-Mogul stumbled as a result of
an ongoing softness in the auto parts  aftermarket.  Furthermore,  prospects for
recovery  seem  unlikely  as  corporations  like  Ford and GM  create  Web-based
supplier  exchanges  that will push prices down even  farther.  As a result,  we
decided to liquidate  our  position at a loss.  Tyco  International  was another
disappointment. This diversified manufacturing company took a hit on allegations
of accounting  irregularities  related to recent  acquisitions,  and although we
feel  confident  the SEC's  investigation  will  vindicate  Tyco,  we elected to
liquidate our position and redeploy our assets in more compelling ideas.

In closing, we remain cautiously optimistic about the economy going forward. All
signs point to continuing  economic growth with few indications of price or wage
pressures on the horizon.  However, our single-minded focus is not on predicting
the future, but on finding well managed, high-quality companies that can perform
in any economic environment.

Thank you for investing in Janus Aspen Growth and Income Portfolio.

Portfolio Asset Mix              December 31, 1999        December 31, 1998
- --------------------------------------------------------------------------------
Equities                                     77.7%                    83.3%
Number of Stocks                                94                       73
Top Ten Equities (% of Assets)               27.7%                    31.1%
Fixed-Income Securities                       4.7%                     0.7%
Cash and Cash Equivalents                    17.6%                    16.0%
- --------------------------------------------------------------------------------

(1)  All returns include reinvested dividends.

(2)  Lipper,  Inc. defines a growth and income portfolio as one that "combines a
     growth of earnings  orientation and an income  requirement for level and/or
     rising  dividends."  The ranking is for  Institutional  Shares and based on
     total return, including reinvestment of dividends and capital gains for the
     stated period.

Past performance does not guarantee future results.

30  Janus Aspen Series / December 31, 1999
<PAGE>

Average Annual Total Return(1)
For the Periods Ended December 31, 1999
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 5/1/98)
  1 Year                                                     74.04%
  From Inception                                             55.33%
- --------------------------------------------------------------------------------
S&P 500 Index
  1 Year                                                     21.03%
  From Portfolio Inception                                   19.85%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/98)
  1 Year                                                     73.20%
  From Inception                                             54.57%
- --------------------------------------------------------------------------------
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)

Average Annual Total Return
for the periods ended December 31, 1999
One Year, 74.04%
Since 5/1/98,* 55.33%

[GRAPHIC OMITTED]

A graphic comparison of the change in value of a hypothetical $10,000 investment
in Janus Aspen Growth and Income  Portfolio -  Institutional  Shares and the S&P
500 Index.  Janus Aspen Growth and Income  Portfolio -  Institutional  Shares is
represented  by a shaded area of green.  The S&P 500 Index is  represented  by a
solid black line.  The "y" axis  reflects the value of the  investment.  The "x"
axis  reflects the  computation  periods from  inception,  May 1, 1998,  through
December 31,  1999.  The lower right  quadrant  reflects the ending value of the
hypothetical   investment   in  Janus  Aspen  Growth  and  Income   Portfolio  -
Institutional Shares ($20,850) as compared to the S&P 500 Index ($13,522).

Janus Aspen Growth and Income Portfolio
- - Institutional Shares - $20,850

S&P 500 Index - $13,522

*The Portfolio's inception date.
Source - Lipper, Inc. 1999.

(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  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 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. Past performance does not guarantee future results.

SCHEDULE OF INVESTMENTS

Shares or Principal Amount                                          Market Value
================================================================================
Common Stock - 76.1%
Advertising Agencies - 0.3%
       2,700    Omnicom Group, Inc. ..........................    $      270,000

Advertising Services - 0.3%
       2,000    TMP Worldwide, Inc.* .........................           284,000

Aerospace and Defense - 0.4%
       6,000    Honeywell International, Inc. ................           346,125

Automotive - Cars and Light Trucks - 0.2%
       4,000    Ford Motor Co. ...............................           213,750

Brewery - 1.1%
      14,000    Anheuser-Busch Companies, Inc. ...............           992,250

Broadcast Services and Programming - 3.4%
      45,000    AT&T Corp./Liberty Media Group - Class A* ....         2,553,750
       5,000    Clear Channel Communications, Inc.* ..........           446,250
       8,065    Four Media Co.* ..............................           119,967

                                                                       3,119,967

Cable Television - 4.8%
       4,800    Adelphia Communications Corp. - Class A* .....           315,000
      21,000    Charter Communications, Inc. - Class A* ......           459,375
      47,000    Comcast Corp. - Special Class A ..............         2,361,750
      21,000    Cox Communications, Inc. - Class A* ..........         1,081,500
       2,500    MediaOne Group, Inc.* ........................           192,031

                                                                       4,409,656

Cellular Telecommunications - 4.7%
       2,000    Aerial Communications, Inc.* .................    $      121,750
      11,000    Crown Castle International Corp.* ............           353,375
       8,000    Nextel Communications, Inc. - Class A* .......           825,000
       6,200    Omnipoint Corp.* .............................           747,875
       7,000    Sprint Corp./PCS Group* ......................           717,500
      11,000    VoiceStream Wireless Corp.* ..................         1,565,438

                                                                       4,330,938

Chemicals - Diversified - 0.2%
      11,000    Solutia, Inc. ................................           169,812

Circuits - 0.2%
       3,000    Maxim Integrated Products, Inc.* .............           141,562

Commercial Services - 0.4%
       2,600    Official Payments Corp.* .....................           135,200
       6,700    Paychex, Inc. ................................           268,000

                                                                         403,200

Computer Data Security - 2.1%
      10,000    VeriSign, Inc.* ..............................         1,909,375

Computer Software - 1.9%
      15,000    Microsoft Corp.* .............................         1,751,250

Computers - Memory Devices - 2.4%
      20,000    EMC Corp.* ...................................         2,185,000

Computers - Micro - 4.0%
      11,500    Dell Computer Corp.* .........................           586,500
      40,000    Sun Microsystems, Inc.* ......................         3,097,500

                                                                       3,684,000

See Notes to Schedules of Investments.

                                      Janus Aspen Series / December 31, 1999  31
<PAGE>

Janus | Aspen Growth and Income Portfolio

SCHEDULE OF INVESTMENTS (continued)

Shares or Principal Amount                                          Market Value
================================================================================
Cruise Lines - 0.3%
       6,000    Royal Caribbean Cruises, Ltd. ................    $      295,875

Distribution and Wholesale - 1.9%
      76,040    Brightpoint, Inc.* ...........................           998,025
       8,000    Costco Wholesale Corp.* ......................           730,000

                                                                       1,728,025

Diversified Financial Services - 1.3%
      21,000    Citigroup, Inc. ..............................         1,166,813

Diversified Operations - 2.7%
      16,000    General Electric Co. .........................         2,476,000

Electronic Components - Semiconductors - 1.9%
       3,000    Intel Corp. ..................................           246,937
      15,000    Texas Instruments, Inc. ......................         1,453,125

                                                                       1,700,062

Entertainment Software - 0.5%
       5,000    Electronic Arts, Inc.* .......................           420,000

Fiber Optics - 2.5%
      13,000    JDS Uniphase Corp.* ..........................         2,097,063
       4,000    Metromedia Fiber Network, Inc. - Class A* ....           191,750

                                                                       2,288,813

Finance - Credit Card - 1.3%
       7,000    American Express Co. .........................         1,163,750

Finance - Investment Bankers/Brokers - 0.1%
       3,300    Charles Schwab Corp. .........................           126,637

Finance - Mortgage Loan Banker - 0.6%
       9,000    Fannie Mae ...................................           561,938

Internet Content - 1.2%
       3,465    Critical Path, Inc.* .........................           327,009
       3,000    DoubleClick, Inc.* ...........................           759,188

                                                                       1,086,197

Internet Software - 8.0%
      16,000    America Online, Inc.* ........................         1,207,000
       4,020    CacheFlow, Inc.* .............................           525,364
       6,000    EarthLink Network, Inc.* .....................           255,000
       2,000    Inktomi Corp.* ...............................           177,500
       8,000    Internap Network Services Corp.* .............         1,384,000
      10,000    Liberate Technologies, Inc.* .................         2,570,000
       3,000    pcOrder.com, Inc.* ...........................           153,000
       4,000    Phone.com, Inc.* .............................           463,750
       3,300    Vignette Corp.* ..............................           537,900

                                                                       7,273,514

Machinery - General Industrial - 0.8%
       3,000    Mannesmann A.G ...............................           730,356

Medical - Biomedical and Genetic - 0.6%
       4,400    Genentech, Inc.* .............................           591,800

Medical - Drugs - 2.1%
      10,000    King Pharmaceuticals, Inc.* ..................           560,625
       5,000    Medco Research, Inc.* ........................           150,313
      19,000    Pfizer, Inc. .................................           616,313
      14,000    Schering-Plough Corp. ........................           590,625

                                                                       1,917,876

Medical Instruments - 0.8%
      20,500    Medtronic, Inc. ..............................           746,969

Multi-Line Insurance - 0.9%
       8,000    American International Group, Inc. ...........           865,000

Multimedia - 3.6%
      24,000    Time Warner, Inc. ............................    $    1,738,500
      25,000    Viacom, Inc. - Class B* ......................         1,510,937

                                                                       3,249,437

Music/Clubs - 0.5%
      12,500    SFX Entertainment, Inc.* .....................           452,344

Networking Products - 3.5%
      30,000    Cisco Systems, Inc.* .........................         3,213,750

Optical Recognition Software - 0.3%
       5,015    Digimarc Corp.* ..............................           250,750

Optical Supplies - 0.2%
       2,800    Allergan, Inc. ...............................           139,300

Pipelines - 1.7%
      36,000    Enron Corp. ..................................         1,597,500

Property and Casualty Insurance - 0.2%
       7,200    Mutual Risk Management, Ltd. .................           121,050
         995    Progressive Corp. ............................            72,759

                                                                         193,809

Radio - 1.0%
       1,000    AMFM, Inc.* ..................................            78,250
       4,000    Entercom Communications Corp.* ...............           264,000
       3,100    Hispanic Broadcasting Corp.* .................           285,878
       7,000    Infinity Broadcasting Corp. - Class A* .......           253,313

                                                                         881,441

Real Estate Investment Trusts - 0.3%
      12,500    Walden Residential Properties, Inc. ..........           270,312

Retail - Building Products - 0.9%
      12,000    Home Depot, Inc. .............................           822,750

Retail - Internet - 0.1%
       1,000    eBay, Inc.* ..................................           125,187

Retail - Offfice Space - 0.5%
      24,000    Staples, Inc.* ...............................           498,000

Super-Regional Banks - 1.0%
       2,000    Bank One Corp. ...............................            64,125
      40,000    Firstar Corp. ................................           845,000

                                                                         909,125

Telecommunication Equipment - 4.8%
       9,000    Lucent Technologies, Inc. ....................           673,313
      15,000    Nokia Oyj (ADR) ..............................         2,850,000
       8,500    Nortel Networks Corp. ........................           858,500

                                                                       4,381,813

Telecommunication Services - 1.1%
       1,000    Allegiance Telecom, Inc.* ....................            92,250
      15,000    McLeodUSA, Inc. - Class A* ...................           883,125

                                                                         975,375

Telephone - Integrated - 2.4%
      16,000    CenturyTel, Inc. .............................           758,000
      10,500    MCI WorldCom, Inc.* ..........................           557,156
      36,849    Telefonica S.A.* .............................           919,338

                                                                       2,234,494

Toys - 0.1%
       7,000    Mattel, Inc. .................................            91,875
- --------------------------------------------------------------------------------
Total Common Stock (cost $46,573,438) ........................        69,637,772
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

32  Janus Aspen Series / December 31, 1999
<PAGE>

Shares or Principal Amount                                          Market Value
================================================================================
Corporate Bonds - 4.7%
Cable Television - 0.2%
$      5,000    Adelphia Communications Corp., 7.75%
                  senior notes, due 1/15/09 ..................    $        4,513
     130,000    Charter Communications Holdings L.L.C.
                  8.625%, senior notes, due 4/1/09 ...........           120,250

                                                                         124,763

Cellular Telecommunications - 0.1%
     100,000    VoiceStream Wireless Corp., 10.375%
                  senior notes, due 11/15/09+ ................           102,750

Computers - Micro - 0.2%
     200,000    Sun Microsystems, Inc., 7.50%
                  senior notes, due 8/15/06 ..................           200,750

Diversified Financial Services - 0.6%
                General Electric Capital Corp.:
      75,000      6.52%, notes, due 10/8/02 ..................            74,250
     500,000      6.81%, notes, due 11/3/03 ..................           495,000

                                                                         569,250

Enterprise Software and Services - 1.6%
   1,000,000    BEA Systems, Inc., 4.00%,
                  convertible subordinated notes,
                  due 12/15/06+ ..............................         1,166,250
     200,000    i2 Technologies, Inc., 5.25%
                  convertible subordinated notes,
                  due 12/15/06+ ..............................           286,250

                                                                       1,452,500

Food - Retail - 0%
       7,000    Fred Meyer, Inc., 7.45%
                  company guaranteed notes, due 3/1/08 .......             6,816

Internet Software - 0%
      30,000    Exodus Communications, Inc., 11.25%
                  senior notes, due 7/1/08 ...................            31,125

Radio - 0.2%
     196,000    Clear Channel Communications, Inc., 1.50%
                  convertible notes, due 12/1/02 .............           200,410

Retail - Internet - 0.1%
     104,000    Amazon.com, Inc., 4.75%
                  convertible subordinated debentures,
                  due 2/1/09+ ................................           117,650

Super-Regional Banks - 0.5%
     500,000    Firstar Bank N.A., 7.125%
                  subordinated notes, due 12/1/09 ............           483,125

Telecommunication Services - 1.2%
      25,000    Allegiance Telecom, Inc., 12.875%
                  senior notes, due 5/15/08 ..................            27,594
       3,000    Level 3 Communications, Inc., 9.125%
                  senior notes, due 5/1/08 ...................             2,827
                NTL, Inc.:
      83,000      7.00%, convertible subordinated notes,
                  due 12/15/08+ ..............................           219,120
     750,000      5.75%, convertible subordinated notes,
                  due 12/15/09+ ..............................           806,250

                                                                       1,055,791
- --------------------------------------------------------------------------------
Total Corporate Bonds (cost $3,937,368) ......................         4,344,930
- --------------------------------------------------------------------------------
Preferred Stock - 1.6%
Automotive - Cars and Light Trucks - 0.4%
         115    Porsche A.G ..................................    $      314,677

Cable Television - 0.6%
       1,250    Adelphia Communications Corp.
                  - Series D, convertible, 5.50% .............           235,156
       3,000    MediaOne Group, Inc.
                  convertible, 6.25%
                  (Vodafone AirTouch PLC (ADR)) ..............           324,000

                                                                         559,156

Cruise Lines - 0%
          70    Royal Caribbean Cruises, Ltd.
                  convertible, 7.25% .........................             9,940

Electric - Integrated - 0.3%
       2,200    Reliant Energy, Inc.
                  convertible, 7.00% (Time Warner, Inc.) .....           265,100

Finance - Other Services - 0.3%
         900    TCI Pacific Communications, Inc.
                  - Series A, convertible, 5.00%
                  (AT&T Corp.) ...............................           277,457
- --------------------------------------------------------------------------------
Total Preferred Stock (cost $1,316,499) ......................         1,426,330
- --------------------------------------------------------------------------------
Repurchase Agreement - 18.5%
$ 16,900,000    Deutsche Bank Securities, Inc., 4.55%
                  dated 12/31/99, maturing 1/3/00, to be
                  repurchased at $16,906,408 collateralized
                  by $4,417,788 in Fannie Mae, 4.005%-
                  7.00%, 11/18/15-5/25/29; $18,526,134
                  in Freddie Mac, 0%-7.3262%, 12/15/12-
                  4/1/29; with respective values of
                  $3,201,056 and $14,036,944
                  (cost $16,900,000) .........................        16,900,000
- --------------------------------------------------------------------------------
Total Investments (total cost $68,727,305) - 100.9% ..........        92,309,032
- --------------------------------------------------------------------------------
Liabilities, net of Cash, Receivables and Other Assets - (0.9%)        (847,001)
- --------------------------------------------------------------------------------
Net Assets - 100% ............................................    $   91,462,031
- --------------------------------------------------------------------------------

Summary of Investments by Country, December 31, 1999

Country                        % of Investment Securities          Market Value
- --------------------------------------------------------------------------------
Bermuda                                    0.1%                   $      121,050
Canada                                     1.0%                          858,500
Finland                                    3.1%                        2,850,000
Germany                                    1.1%                        1,045,033
Spain                                      1.0%                          919,338
United States++                           93.7%                       86,515,111
- --------------------------------------------------------------------------------
Total                                    100.0%                   $   92,309,032

++Includes Short-Term Securities (75.4% excluding Short-Term Securities)

See Notes to Schedules of Investments.

                                      Janus Aspen Series / December 31, 1999  33
<PAGE>

Janus | Aspen Flexible Income Portfolio

[PHOTO]
Ronald Speaker
portfolio manager

For the fiscal  year ended  December  31,  1999,  Janus  Aspen  Flexible  Income
Portfolio  returned  1.60%  for  its  Institutional  Shares  and  0.90%  for its
Retirement Shares. This compares with a (2.15)% decline posted by its benchmark,
the Lehman Brothers Government/Corporate Bond Index.(1)

The  fixed-income   markets  faced  strong  headwinds  throughout  the  year  as
above-trend  growth in the U.S. ignited fears of inflation and pushed both long-
and  short-term  interest  rates  higher.  Despite the Federal  Reserve's  three
quarter-point  increases  in  short-term  rates  during the  second  half of the
period,  the economy  continued to grow at a fast clip.  Meanwhile,  bond prices
trended lower,  particularly  those of longer-dated,  rate-sensitive  securities
such as Treasuries and investment-grade bonds.

In this  challenging  environment,  we decreased the Portfolio's  sensitivity to
rising  interest  rates by reducing our weighting in Treasury bonds and focusing
primarily  on  securities  within the two- to 10-year  maturity  range.  We also
upgraded the credit quality of our investment-grade  holdings,  adding positions
in well-financed companies such as Procter & Gamble and Wal-Mart.

Meanwhile,  in the high-yield arena,  demand fell  considerably  short of supply
because  of  Y2K-related   liquidity  fears  and  competition  from  high-flying
technology stocks.  Fortunately,  our intensive,  proprietary research led us to
several  high-yield  bonds that  benefited  from either  capital  infusions from
leveraged buyout firms or the market's  increasing  recognition of the strategic
value of these  companies.  In turn, many of them proved capable of successfully
withstanding broader market pressures and rewarded us with solid results.

One of our best performers in the high-yield area was NorthEast Optic Network, a
fiber-optic  network operator in the northeastern  U.S. and a recent addition to
the  Portfolio.  Benefiting  from high demand for its services,  NorthEast  also
gained on news of a hefty investment made by energy holding company Consolidated
Edison - money NorthEast will use to make further  improvements to its business.
A similar scenario  unfolded for RCN, a competitive  local exchange carrier that
provides  telecom  services  in  the  Boston-Washington,  D.C.,  corridor.  Like
NorthEast,  RCN received a sizeable  equity  infusion from investors  during the
period, helping our holding appreciate in value.

Our focus on quality also led us to  companies we believed had the  potential to
"graduate" to a higher  credit  rating.  For example,  when our analysis of life
insurer and consumer  lender  Conseco  revealed an improving  balance sheet and,
therefore,  the  possibility of a rating  upgrade,  we invested.  Several months
later,  a $500 million  investment  made by an outside firm along with  stronger
cash flow earned Conseco a better rating, sending the bonds higher.

We also benefited from our positions in several  yield-to-call bonds,  including
supermarket  operator Star Markets.  The company's strong  U.S.-based cash flows
and  generous  yields  served as an  excellent  cushion and  contributed  to the
Portfolio's  results  throughout  much of the year.  Subsequently,  Star Markets
refinanced its debt,  calling in its bonds.  Our  performance  was also aided by
Unilab,   California's  largest  medical  testing  company.  Unilab  appreciated
following the  announcement of a buyout by the private  investment group Kelso &
Company.  We further  benefited  from  Unilab's  decision to call its bonds at a
premium to our purchase price.

Unfortunately, not all of our holdings met expectations. As I mentioned earlier,
Treasuries  suffered  under the weight of rising  interest  rates,  and  despite
reducing the Portfolio's  exposure to these  securities,  their poor performance
still managed to detract from our overall results.  Another  disappointment  was
our high-yield  position in Tokheim,  a manufacturer of gas pumps. The company's
revenues declined when industry consolidation issues caused the delay of several
big orders at the company, and we consequently sold the position.

Looking  ahead,  given that the Federal  Reserve's  three rate hikes have yet to
substantially slow the economy, additional increases may be necessary.  However,
we believe this  challenging  environment can work in our favor and are using it
as an opportunity to put our cash to work.  That said, we continue to search for
credits that offer solid interest  income as well as the potential for stable or
appreciating prices.

In closing,  we'd like to thank you for your continued investment in Janus Aspen
Flexible Income Portfolio.

Portfolio Asset Mix              December 31, 1999        December 31, 1998
- --------------------------------------------------------------------------------
Corporate Bonds
  Investment Grade/Warrants                  39.1%                    36.0%
  High-Yield/High-Risk                       30.4%                    26.0%
U.S. Government Bonds                         7.8%                    23.8%
Foreign Dollar/
  Non-Dollar Bonds                            8.4%                     1.6%
Preferred Stock                               1.7%                     2.4%
Cash & Cash Equivalents                      12.6%                    10.2%
- --------------------------------------------------------------------------------

Portfolio Profile
- --------------------------------------------------------------------------------
Weighted Average Maturity                  6.5 Yrs.                 8 7 Yrs.
Average Modified Duration*                 4.5 Yrs.                 6 0 Yrs.
30-Day Average Yield**
  Institutional Shares**                     8.22%                    6.21%
  Retirement Shares**                        7.56%                    5.70%
Average Rating                                 BBB                       A+
- --------------------------------------------------------------------------------
 * A theoretical measure of price volatility.
** Yields will fluctuate.

(1)  All returns include reinvested dividends.

Past performance does not guarantee future results.

34  Janus Aspen Series / December 31, 1999
<PAGE>

Average Annual Total Return(1)
For the Periods Ended December 31, 1999
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 9/13/93)
  1 Year                                                      1.60%
  5 Year                                                     10.88%
  From Inception                                              8.50%
- --------------------------------------------------------------------------------
Lehman Brothers Govt./Corp. Bond Index
  1 Year                                                    (2.15)%
  5 Year                                                      7.61%
  From Inception Date of Institutional Shares                 5.40%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                      0.90%
  5 Year                                                     10.24%
  From Portfolio Inception                                    7.89%
- --------------------------------------------------------------------------------
Returns shown for  Retirement  Shares for periods  prior to their  inception are
derived from the historical  performance of  Institutional  Shares,  adjusted to
reflect the higher operating expenses of Retirement Shares.

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)

Average Annual Total Return
for the periods ended December 31, 1999
One Year, 1.60%
Five Year, 10.88%
Since 9/13/93,* 8.50%

[GRAPHIC OMITTED]

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  Govt./Corp.  Bond  Index.  Janus  Aspen  Flexible  Income  Portfolio -
Institutional  Shares  is  represented  by a shaded  area of green.  The  Lehman
Brothers  Govt./Corp.  Bond Index is  represented by a solid 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, 1999. The lower
right quadrant reflects the ending value of the hypothetical investment in Janus
Aspen Flexible Income Portfolio - Institutional  Shares ($16,721) as compared to
the Lehman Brothers Govt./Corp. Bond Index ($13,928).

Janus Aspen Flexible Income Portfolio
- - Institutional Shares - $16,721

Lehman Brothers Govt./Corp. Bond Index - $13,928

*The Portfolio's inception date.
Source - Lipper, Inc. 1999.

(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  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. Investing in high-yield/high-risk securities may entail greater risk.
     Past performance does not guarantee future results.

SCHEDULE OF INVESTMENTS

Shares or Principal Amount                                          Market Value
================================================================================
Corporate Bonds - 71.2%
Automotive - Cars and Light Trucks - 2.1%
$  4,000,000    DaimlerChrysler N.A. Holding Corp., 7.20%
                  company guaranteed notes, due 9/1/09 .......    $    3,935,000

Beverages - Wine and Spirits - 0.7%
   1,500,000    Joseph E. Seagram & Sons, Inc., 6.80%
                  company guaranteed notes, due 12/15/08 .....         1,406,250

Brewery - 0.5%
   1,000,000    Anheuser-Busch Companies, Inc., 5.65%
                  notes, due 9/15/08 .........................           892,500

Broadcast Services and Programming - 2.9%
   4,000,000    AT&T Corp./Liberty Media Group, 7.875%
                  notes, due 7/15/09+ ........................         3,970,000
   1,250,000    Paxson Communications Corp., 11.625%
                  senior subordinated notes, due 10/1/02 .....         1,301,562

                                                                       5,271,562

Cable Television - 5.2%
     500,000    Century Communications Corp., 8.375%
                  senior notes, due 12/15/07 .................           473,750
   1,500,000    Charter Communications Holdings L.L.C.
                  8.625%, senior notes, due 4/1/09 ...........         1,387,500
     230,000    Classic Cable, Inc., 9.375%
                  company guaranteed notes, due 8/1/09 .......           227,125
                Cox Communications, Inc.:
   3,000,000      6.375%, notes, due 6/15/00 .................         2,996,250
   1,500,000      7.875%, notes, due 8/15/09 .................         1,518,750
   1,000,000    Jones Intercable, Inc., 7.625%
                  senior notes, due 4/15/08 ..................           992,500
                Lenfest Communications, Inc.:
   1,000,000      10.50%, senior subordinated notes
                  due 6/15/06 ................................         1,122,500
   1,000,000      7.625%, senior notes, due 2/15/08 ..........           998,750

                                                                       9,717,125

Casino Hotels - 1.2%
$    500,000    Santa Fe Hotel, Inc., 11.00%
                  first mortgage notes, due 12/15/00 .........    $      491,250
   2,000,000    Venetian Casino Resort L.L.C., 12.25%
                  company guaranteed notes, due 11/15/04 .....         1,745,000

                                                                       2,236,250

Casino Services - 0.4%
     750,000    Isle of Capri Black Hawk L.L.C., 13.00%
                  first mortgage bonds, due 8/31/048 .........            15,625

Cellular Telecommunications - 2.2%
   4,000,000    VoiceStream Wireless Corp., 10.375%
                  senior notes, due 11/15/09+ ................         4,110,000

Commercial Banks - 1.4%
   1,000,000    City National Bank, 6.375%
                  subordinated notes, due 1/15/08 ............           910,000
     700,000    Hudson United Bancorp, Inc., 8.20%
                  subordinated debentures, due 9/15/06 .......           686,875
   1,000,000    Provident Trust I Corp., 8.29%
                  company guaranteed notes, due 4/15/28 ......           943,750

                                                                       2,540,625

Computer Services - 3.1%
     425,000    Dialog Corp. PLC, 11.00%
                  senior subordinated notes, due 11/15/07 ....           221,000
   4,500,000    Electronic Data Systems Corp., 7.125%
                  notes, due 10/15/09 ........................         4,393,125
       1,250    Equinix, Inc., 13.00%
                  units, due 12/1/07+ ........................         1,275,000

                                                                       5,889,125

See Notes to Schedules of Investments.

                                      Janus Aspen Series / December 31, 1999  35
<PAGE>

Janus | Aspen Flexible Income Portfolio

SCHEDULE OF INVESTMENTS (continued)

Shares or Principal Amount                                          Market Value
================================================================================
Computers - Micro - 1.7%
                IBM Corp.:
$  2,500,000      5.375%, notes, due 2/1/09 ..................    $    2,196,875
   1,000,000      7.00%, debentures, due 10/30/25 ............           947,500

                                                                       3,144,375

Containers - Paper and Plastic - 2.2%
   3,925,000    Stone Container Corp., 10.75%
                  first mortgage notes, due 10/1/02 ..........         4,032,938

Cosmetics and Toiletries - 2.1%
   4,000,000    Procter & Gamble Co., 6.875%
                  unsubordinated notes, due 9/15/09 ..........         3,915,000

Cruises Lines - 1.0%
   2,000,000    Royal Caribbean Cruises, Ltd., 7.00%
                  senior notes, due 10/15/07 .................         1,877,500

Diversified Financial Services - 0.9%
   1,650,000    Local Financial Corp., 11.00%
                  senior notes, due 9/8/04 ...................         1,693,312

Diversified Operations - 0.1%
     200,000    Pac-West Telecomm, Inc., 13.50%
                  senior notes, due 2/1/09 ...................           207,500

Electric - Generation - 0.3%
     521,227    Caithness Coso Fund Corp., 6.80%
                  secured notes, due 12/15/01 ................           510,151

Electric - Integrated - 0.4%
     600,000    El Paso Electric Co., 9.40%
                  first mortgage bonds, due 5/1/11 ...........           640,500

Fiber Optics - 1.7%
   2,500,000    NorthEast Optic Network, Inc., 12.75%
                  senior notes, due 8/15/08 ..................         2,668,750
     500,000    Williams Communications Group, Inc.
                  10.875%, senior notes, due 10/1/09 .........           523,750

                                                                       3,192,500

Finance - Auto Loans - 1.8%
                Ford Motor Credit Co.:
   1,000,000      6.125%, notes, due 4/28/03 .................           967,500
   2,500,000      7.375%, notes, due 10/28/09 ................         2,475,000

                                                                       3,442,500

Finance - Other Services - 0.9%
     500,000    First American Capital Trust, 8.50%
                  company guaranteed notes, due 4/15/12 ......           479,375
   1,000,000    Ono Finance PLC, 13.00%
                  company guaranteed notes, due 5/1/09+ ......         1,022,500
     500,000    SIG Capital Trust I, 9.50%
                  company guaranteed notes, due 8/15/27 ......           200,000

                                                                       1,701,875

Food - Diversified - 0.4%
     750,000    Ralston Purina Co., 7.875%
                  debentures, due 6/15/25 ....................           723,750

Food - Retail - 8.0%
                Fred Meyer, Inc.:
$  2,000,000      7.15%, company guaranteed notes
                  due 3/1/03 .................................    $    1,972,500
   4,000,000      7.45%, company guaranteed notes
                  due 3/1/08 .................................         3,895,000
   2,000,000    Marsh Supermarkets, Inc., 8.875%
                  company guaranteed notes, due 8/1/07 .......         1,920,000
     910,000    Pantry, Inc., 10.25%
                  company guaranteed notes, due 10/15/07 .....           871,325
                Safeway, Inc.:
   3,500,000      5.875%, notes, due 11/15/01 ................         3,421,250
   2,000,000      7.50%, notes, due 9/15/09 ..................         1,972,500
   1,000,000    Stater Brothers Holdings, Inc., 10.75%
                  senior notes, due 8/15/06 ..................         1,002,500

                                                                      15,055,075

Gambling - Non-Hotel Casinos - 0.9%
   1,660,000    Lady Luck Gaming Corp., 11.875%
                  first mortgage notes, due 3/1/01 ...........         1,660,000

Internet Software - 1.8%
     750,000    Exodus Communications, Inc., 11.25%
                  senior notes, due 7/1/08 ...................           778,125
   2,500,000    PSINet, Inc., 11.00%
                  senior notes, due 8/1/09 ...................         2,581,250

                                                                       3,359,375

Leisure, Recreation and Gaming - 0.6%
   1,500,000    Hard Rock Hotel, Inc., 9.25%
                  senior subordinated notes, due 4/1/05 ......         1,091,250

Life and Health Insurance - 1.6%
                Conseco, Inc.:
   1,725,000      7.60%, senior notes, due 6/21/01 ...........         1,722,844
     500,000      9.00%, notes, due 10/15/06 .................           513,125
     742,000    Delphi Financial Group, Inc., 8.00%
                  senior notes, due 10/1/03 ..................           738,290

                                                                       2,974,259

Medical - Hospitals - 0.2%
     500,000    Columbia/HCA Healthcare Corp., 8.36%
                  debentures, due 4/15/24 ....................           455,625

Multimedia - 1.0%
                Time Warner, Inc.:
   1,000,000      8.18%, notes, due 8/15/07 ..................         1,028,750
   1,000,000      6.95%, company guaranteed notes
                  due 1/15/28 ................................           885,000

                                                                       1,913,750

Music/Clubs - 0.5%
   1,000,000    SFX Entertainment, Inc., 9.125%
                  company guaranteed notes, due 2/1/08 .......           945,000

Networking Products - 1.1%
     500,000    Anixter International, Inc., 8.00%
                  company guaranteed notes, due 9/15/03 ......           495,000
   1,500,000    Concentric Network Corp., 12.75%
                  senior notes, due 12/15/07 .................         1,586,250

                                                                       2,081,250

See Notes to Schedules of Investments.

36  Janus Aspen Series / December 31, 1999
<PAGE>

Shares or Principal Amount                                          Market Value
================================================================================
Oil Companies - Integrated - 0.5%
$  1,000,000    Chevron Corp., 6.625%
                  notes, due 10/1/04 .........................    $      983,750

Optical Supplies - 0.5%
     950,000    Bausch & Lomb, Inc., 6.75%
                  notes, due 12/15/04 ........................           915,562

Paint and Related Products - 0.3%
     500,000    Sherwin-Williams Co., 6.85%
                  notes, due 2/1/07 ..........................           478,750

Physical Therapy and Rehabilitation Centers - 1.0%
                HEALTHSOUTH Corp.:
   1,500,000      9.50%, senior subordinated notes
                  due 4/1/01 .................................         1,496,250
     500,000      7.00%, senior notes, due 6/15/08 ...........           406,875

                                                                       1,903,125

Pipelines - 0.5%
   1,000,000    Enron Corp., 7.375%
                  bonds, due 5/15/19 .........................           936,250

Recreational Centers - 0.8%
   1,500,000    Bally Total Fitness Holding Corp., 9.875%
                  senior subordinated notes, due 10/15/07 ....         1,455,000

Retail - Discount - 2.2%
     300,000    Ames Department Stores, Inc., 10.00%
                  senior notes, due 4/15/06 ..................           296,250
   4,000,000    Wal-Mart Stores, Inc., 6.875%
                  senior notes, due 8/10/09 ..................         3,895,000

                                                                       4,191,250

Retail - Leisure Products - 0.1%
     150,000    Selmer Company, Inc., 11.00%
                  senior subordinated notes, due 5/15/05 .....           158,250

Retail - Restaurants - 1.1%
   1,000,000    McDonald's Corp., 6.375%
                  debentures, due 1/8/28 .....................           858,750
     500,000    Perkins Family Restaurant L.P., 10.125%
                  senior notes, due 12/15/07 .................           503,750
     250,000    Romacorp, Inc., 12.00%
                  company guaranteed notes, due 7/1/06 .......           226,875
     500,000    Tricon Global Restaurants, Inc., 7.65%
                  senior notes, due 5/15/08 ..................           470,000

                                                                       2,059,375

Savings/Loan/Thrifts - 3.2%
                Dime Bancorp, Inc.:
   1,650,000      6.375%, senior notes, due 1/30/01 ..........         1,631,438
   3,000,000      7.00%, senior notes, due 7/25/01 ...........         2,970,000
   1,000,000    Golden State Holdings, Inc., 7.00%
                  senior notes, due 8/1/03 ...................           937,500
     500,000    Sovereign Bancorp, Inc., 10.50%
                  senior notes, due 11/15/06 .................           507,500

                                                                       6,046,438

Telecommunication Services - 4.9%
$    500,000    Adelphia Business Solutions, Inc., 12.00%
                  senior subordinated notes, due 11/1/07 .....    $      527,500
     775,000    CapRock Communications Corp., 11.50%
                  senior notes, due 5/1/09 ...................           796,312
   1,220,000    Galaxy Telecom L.P., 12.375%
                  senior subordinated notes, due 10/1/05 .....         1,296,250
   1,250,000    Logix Communications Enterprises, Inc.
                  12.25%, senior notes, due 6/15/08 ..........           996,875
     600,000    McLeodUSA, Inc., 9.25%
                  senior notes, due 7/15/07 ..................           603,000
                NTL, Inc.:
     720,000      12.75%, senior notes, due 4/15/057 .........            22,700
   1,000,000      5.75%, convertible subordinated notes
                  due 12/15/09+ ..............................         1,075,000
     150,000    Pegasus Media Communications, 12.50%
                  notes, due 7/1/05 ..........................           160,875
   1,000,000    RCN Corp., 10.00%
                  senior notes, due 10/15/07 .................           995,000
     500,000    Versatel Telecom B.V., 13.25%
                  senior notes, due 5/15/08 ..................           533,750
   1,500,000    Worldwide Fiber, Inc., 12.00%
                  senior notes, due 8/1/09+ ..................         1,560,000

                                                                       9,267,262

Telephone - Integrated - 0.9%
   2,000,000    GTE Northwest, Inc., 5.55%
                  debentures, due 10/15/08 ...................         1,755,000

Telephone - Long Distance - 1.8%
   3,500,000    Qwest Communications International, Inc.
                  7.50%, senior notes, due 11/1/08 ...........         3,408,125

Television - 3.3%
   3,000,000    Fox/Liberty Networks L.L.C., 8.875%
                  senior notes, due 8/15/07 ..................         3,067,500
   2,000,000    News America, Inc., 6.625%
                  senior notes, due 1/9/08 ...................         1,852,500
     250,000    Pegasus Communications Corp., 12.50%
                  senior notes, due 8/1/07+ ..................           272,500
   1,000,000    Price Communications Wireless, Inc., 11.75%
                  senior subordinated notes, due 7/15/07 .....         1,102,500

                                                                       6,295,000

Textile - Products - 0.5%
   1,000,000    Collins & Aikman Floorcovering, Inc., 10.00%
                  senior subordinated notes, due 1/15/07 .....           980,000

Transportation - Services - 0.7%
   1,250,000    RailWorks Corp., 11.50%
                  company guaranteed notes, due 4/15/09 ......         1,265,625
- --------------------------------------------------------------------------------
Total Corporate Bonds (cost $137,195,660) ....................       133,530,309
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

                                      Janus Aspen Series / December 31, 1999  37
<PAGE>

Janus | Aspen Flexible Income Portfolio

SCHEDULE OF INVESTMENTS (continued)

Shares or Principal Amount                                          Market Value
================================================================================
Foreign Bond - 6.6%
Advertising Services - 1.4%
EUR
   2,500,000    Go Outdoor Systems Holdings S.A., 10.50%
                  senior subordinated notes, due 7/15/09**,+ .    $    2,653,325

Fiber Optics - 0.3%
EUR
     500,000    Metromedia Fiber Network, Inc., 10.00%
                  senior notes, due 12/15/09** ...............           514,318

Golf - 0.9%
GBP
   1,000,000    Clubhaus PLC, 12.875%
                  senior notes, due 6/1/09**,+ ...............         1,712,112

Internet Software - 1.1%
EUR
   1,000,000    Exodus Communications, Inc., 10.75%
                  senior notes, due 12/15/09**,+ .............         1,027,377
EUR
   1,000,000    PSINet, Inc., 11.00%
                  senior notes, due 8/1/09** .................         1,033,665

                                                                       2,061,042

Telecommunication Equipment - 1.4%
EUR
   2,500,000    Global TeleSystems Group, Inc., 11.00%
                  bonds, due 12/1/09**,+ .....................         2,540,150

Telecommunication Services - 1.0%
EUR
     750,000    Jazztel PLC, 13.25%
                  senior notes, due 12/15/09**,+ .............           759,216
EUR
   1,000,000    Versatel Telecom B.V., 11.875%
                  senior notes, due 7/15/09** ................         1,071,390

                                                                       1,830,606

Telephone - Long Distance - 0.5%
EUR
   1,000,000    Viatel, Inc., 11.50%
                  senior notes, due 3/15/09** ................         1,021,090
- --------------------------------------------------------------------------------
Total Foreign Bonds (cost $12,168,781) .......................        12,332,643
- --------------------------------------------------------------------------------
Preferred Stock - 1.7%
Commercial Services - 0.4%
      20,000    Cendant Corp., convertible, 7.50% ............           747,500

Networking Products - 0.5%
         969    Concentric Network Corp. - Series B, 13.50% ..           949,620

Savings/Loan/Thrifts - 0.8%
      35,600    Chevy Chase Savings Bank, 13.00% .............         1,068,000
       8,000    Sovereign Capital Trust II, convertible, 7.50%           388,000

                                                                       1,456,000
- --------------------------------------------------------------------------------
Total Preferred Stock (cost $2,938,100) ......................         3,153,120
- --------------------------------------------------------------------------------
Warrants - 0.1%
Finance - Other Services - 0.1%
       1,000    Ono Finance PLC - expires 5/31/09*,+ .........           110,000

Retail - Diversified - 0%
         450    SpinCycle, Inc. - expires 5/1/05* ............                 0

Telecommunication Services - 0%
         225    Versatel Telecom B.V. - expires 5/15/08*,+ ...            90,000
- --------------------------------------------------------------------------------
Total Warrants (cost $0) .....................................           200,000
- --------------------------------------------------------------------------------
U.S. Government Obligations - 7.8%
                U.S. Treasury Notes:
$  5,000,000      6.125%, due 12/31/01 .......................         4,991,407
   8,000,000      6.125%, due 8/15/07 ........................         7,802,160
   2,000,000      5.625%, due 5/15/08** ......................         1,880,840
- --------------------------------------------------------------------------------
Total U.S. Government Obligations (cost $15,193,420) .........        14,674,407
- --------------------------------------------------------------------------------
Repurchase Agreement - 11.8%
$ 22,200,000    Deutsche Bank Securities, Inc., 4.55%
                  dated 12/31/99, maturing 1/3/00, to be
                  repurchased at $22,208,418 collateralized
                  by $5,803,248 in Fannie Mae, 4.005%-
                  7.00%, 11/18/15-5/25/29; $24,336,105
                  in Freddie Mac, 0%-7.3262%, 12/15/12-
                  4/1/29; with respective values of
                  $4,204,937 and $18,439,063
                  (cost $22,200,000) .........................    $   22,200,000
- --------------------------------------------------------------------------------
Total Investments (total cost $189,695,961) - 99.2% ..........       186,090,479
- --------------------------------------------------------------------------------
Cash, Receivables and Other Assets, net of Liabilities - 0.8%          1,432,552
- --------------------------------------------------------------------------------
Net Assets - 100% ............................................    $  187,523,031
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
Financial Futures - Short
 10 Contracts   U.S. Treasury - 5 year bond, expires
                  March 2000, principal amount
                  $993,047 value $980,156,
                  cumulative appreciation                         $       12,891
275 Contracts   U.S. Treasury - 10 year bond, expires
                  March 2000, principal amount
                  $26,764,219 value $26,361,330,
                  cumulative appreciation                                402,889
- --------------------------------------------------------------------------------

Forward Currency Contracts, Open at December 31, 1999

Currency Sold and                  Currency            Currency       Unrealized
Settlement Date                  Units Sold     Value in $ U.S.      Gain/(Loss)
- --------------------------------------------------------------------------------
British Pound 4/20/00               980,000       $   1,585,150      $    49,686
Euro 3/16/00                      1,900,000           1,924,130           94,620
Euro 4/7/00                       5,800,000           5,882,940          297,292
Euro 6/9/00                       2,600,000           2,648,620           17,065
- --------------------------------------------------------------------------------
Total                                             $  12,040,840      $   458,663

See Notes to Schedules of Investments.

38  Janus Aspen Series / December 31, 1999
<PAGE>

                                              Janus | Aspen High-Yield Portfolio

[PHOTO]
Sandy Rufenacht
portfolio manager

I'm happy to report that for the 12 months ended December 31, 1999,  Janus Aspen
High-Yield Portfolio  outperformed its benchmark,  posting a return of 6.85% for
its Institutional  Shares and 6.35% for its Retirement Shares. By contrast,  the
Lehman Brothers High-Yield Bond Index returned 2.39%.(1) This performance earned
the  Portfolio a  top-quartile  ranking,  placing it 12th out of 70 high current
yield  portfolios  tracked  by  Lipper,  Inc.,  a  leading  mutual  fund  rating
company.(2)

Given the many  challenges  fixed-income  markets  faced  during  the year,  our
performance was especially satisfying. These challenges included everything from
improving  but still  depressed  emerging  market  economies to turbulent  stock
prices to renewed  inflation  fears.  The latter prompted the Federal Reserve to
boost short-term interest rates three times, which further pressured the overall
bond market.  Yet, because high-yield bonds pay a wide spread over Treasury bond
rates, they held up relatively well in this rising interest rate environment and
outperformed the broader fixed-income universe.

Unique to the high-yield market, however, was an oversupply scenario. Throughout
much of the year,  high-yield  supply outweighed  demand,  forcing existing bond
prices  lower.  We viewed this as nothing  more than a buying  opportunity  and,
therefore,  selectively  added to positions we believed were  undervalued by the
market. In particular, we focused on well-known, well-capitalized companies that
are paying down debt and improving their credit quality.

Our strategy of investing in  higher-grade  corporate bonds during this volatile
period proved to be a double-edged  sword. While higher quality,  lower-yielding
securities helped safeguard our investors' assets, their vulnerability to rising
interest rates tempered the Portfolio's overall gains. Nonetheless, we uncovered
a number of  individual  opportunities  that  rewarded  us with  solid  results,
ultimately tipping the scales in our favor.

We were particularly pleased with our positions in several  yield-to-call bonds,
which not only boosted the  Portfolio's  income but also helped  cushion it from
market volatility. Standouts included cellular telecom firm Price Communications
Wireless and British cable  operator NTL. Price  Communications  caters to small
cities and rural areas in the  southeastern  U.S.,  and by offering new services
through its upgraded network, it's rapidly improving cash flow.  Meanwhile,  NTL
is on its way to becoming  the  largest  cable  operator  in the U.K.,  offering
subscribers a menu of services that include video-on-demand, high-speed Internet
access, cable telephony and more.

Another solid performer was SF Holdings  Group, a company with equity  ownership
in Sweetheart Cup and Fonda Group, two  manufacturers of disposable food service
products.  Because of Fonda's  success in securing the  much-coveted  McDonald's
restaurant  contract  and  Sweetheart's   ability  to  provide  Fonda  with  the
additional production capacity it needed to fulfill the contract, both companies
benefited, and our position in parent company SF Holdings appreciated.

Although we were  pleased with the  Portfolio's  overall  results,  a few of our
holdings did not meet our  expectations,  including  Packaged  Ice. This company
easily dominates the U.S. wholesale ice market and continues to expand its reach
through acquisitions.  However,  during last summer's heat wave, production fell
behind,  and  Packaged  Ice was  forced to buy ice at a premium so that it could
fulfill its fixed-price contracts.  Needless to say, the bonds faded during this
predicament. But after meeting with management and learning that the company has
renegotiated its contracts, we opted to maintain our holding.

Our position in Venetian  Casino,  a Las Vegas venue,  also  declined  after the
company rushed its grand  opening.  Many of the casino's  world-class  amenities
weren't yet  available  during the opening,  prompting  tourists to frequent its
competition. However, the entire facility is now fully operational, and bookings
have increased considerably, bolstering our confidence in the position.

Going forward,  we remain optimistic that our focus on quality  high-yield bonds
will help us navigate any  turbulence  in the economy or financial  markets.  In
anticipation  of a strong new issuance  calendar,  we are also carrying a higher
cash position into the new year. We plan to put that money to work in compelling
investment  opportunities,  concentrating  on well-managed  companies with solid
U.S.-based  cash flows.  We'll also  selectively add  shorter-term  positions in
yield-to-call  bonds,  which provide minimal  downside risk and a healthy coupon
income.

In closing,  I'd like to thank you for your continued  investment in Janus Aspen
High-Yield Portfolio.

Portfolio Profile                December 31, 1999        December 31, 1998
- --------------------------------------------------------------------------------
Weighted Average Maturity                  5.1 Yrs.                 5.1 Yrs.
Average Modified Duration*                 3.6 Yrs.                 3.7 Yrs.
30-Day Average Yield
  Institutional Shares**                     9.45%                    8.31%
    Without Reimbursement**                  6.94%                      N/A
  Retirement Shares**                        8.80%                    7.89%
    Without Reimbursement**                  6.32%                      N/A
Average Rating                                  B-                        B
- --------------------------------------------------------------------------------
* A theoretical measure of price volatility.
** Yields will fluctuate.

(1)  All returns include reinvested dividends.

(2)  Lipper,  Inc.  defines a high current yield  portfolio as "a portfolio that
     aims at high (relative) current yield from fixed income securities,  has no
     quality or maturity  restrictions,  and tends to invest in lower grade debt
     issues." As of December 31, 1999, Janus Aspen  High-Yield  Portfolio ranked
     6/45 for the 3-year  period.  The ranking is for  Institutional  Shares and
     based on total  return,  including  reinvestment  of dividends  and capital
     gains for the stated period.

Past performance does not guarantee future results.

                                      Janus Aspen Series / December 31, 1999  39
<PAGE>

Average Annual Total Return(1)
For the Periods Ended December 31, 1999
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 5/1/96)
  1 Year                                                      6.85%
  From Inception                                              9.83%
- --------------------------------------------------------------------------------
Lehman Brothers High-Yield Bond Index
  1 Year                                                      2.39%
  From Inception Date of Institutional Shares                 7.06%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                      6.35%
  From Portfolio Inception                                    6.19%
- --------------------------------------------------------------------------------
Returns shown for  Retirement  Shares for periods  prior to their  inception are
derived from the historical  performance of  Institutional  Shares,  adjusted to
reflect the higher operating expenses of Retirement Shares.

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)

Average Annual Total Return
for the periods ended December 31, 1999
One Year, 6.85%
Since 5/1/96,* 9.83%

[GRAPHIC OMITTED]

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 shaded area of green. The Lehman Brothers  High-Yield
Bond Index is represented by a solid 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, 1999. The lower right quadrant  reflects the
ending value of the hypothetical  investment in Janus Aspen High-Yield Portfolio
- - Institutional  Shares ($14,105) as compared to the Lehman Brothers  High-Yield
Bond Index ($12,840).

Janus Aspen High-Yield Portfolio
- - Institutional Shares - $14,105

Lehman Brothers High-Yield
Bond Index - $12,840

*The Portfolio's inception date.
Source - Lipper, Inc. 1999.

(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  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 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.  Investing in  high-yield/high-risk  securities may entail
     greater risk. Past performance does not guarantee future results.

SCHEDULE OF INVESTMENTS

Shares or Principal Amount                                          Market Value
================================================================================
Corporate Bonds - 76.9%

Agricultural Operations - 1.4%
$     23,000    Hines Horticulture, Inc., 11.75%
                  senior subordinated notes, due 10/15/05 ....    $       23,747

Building - Residential and Commercial - 1.4%
      10,000    MDC Holdings, Inc., 8.375%
                  senior notes, due 2/1/08 ...................             9,112
      15,000    Webb (Del E.) Corp., 10.25%
                  senior subordinated notes, due 2/15/10 .....            14,363

                                                                          23,475

Cable Television - 6.4%
      25,000    Avalon Cable of Michigan, Inc., 9.375%
                  senior subordinated notes, due 12/1/08 .....            25,187
      50,000    FrontierVision Holdings L.P., 11.00%
                  senior subordinated notes, due 10/15/06 ....            53,000
      25,000    Fundy Cable, Ltd., 11.00%
                  senior notes, due 11/15/05 .................            27,000

                                                                         105,187

Casino Hotels - 6.7%
      25,000    Majestic Star Casino L.L.C./Capital, 10.875%
                  company guaranteed notes, due 7/1/06 .......            24,312
      30,000    Santa Fe Hotel, Inc., 11.00%
                  first mortgage notes, due 12/15/00 .........            29,475
      30,000    Station Casinos, Inc., 10.125%
                  senior subordinated notes, due 3/15/06 .....            30,675
      30,000    Venetian Casino Resort L.L.C., 12.25%
                  company guaranteed notes, due 11/15/04 .....            26,175

                                                                         110,637

Cellular Telecommunications - 3.5%
$     20,000    Orange PLC, 8.00%
                  senior notes, due 8/1/08 ...................    $       20,300
      25,000    Price Communications Wireless, Inc., 11.75%
                  senior subordinated notes, due 7/15/07 .....            27,563
      10,000    VoiceStream Wireless Corp., 10.375%
                  senior notes, due 11/15/09+ ................            10,275

                                                                          58,138

Computer Services - 4.4%
      30,000    Globix Corp., 13.00%
                  senior notes, due 5/1/05 ...................            30,300
      45,000    Splitrock Services, Inc., 11.75%
                  company guaranteed notes, due 7/15/08 ......            41,738

                                                                          72,038

Containers - Paper and Plastic - 4.2%
      15,000    Packaged Ice, Inc., 9.75%
                  company guaranteed notes, due 2/1/05 .......            13,688
      60,000    SF Holdings Group, Inc., zero coupon
                  senior discount notes, due 3/15/08 .........            33,975
      20,000    Stone Container Corp., 10.75%
                  first mortgage notes, due 10/1/02 ..........            20,550

                                                                          68,213

Distribution and Wholesale - 1.2%
      20,000    Core-Mark International, Inc., 11.375%
                  senior subordinated notes, due 9/15/03 .....            19,000

Diversified Operations - 3.2%
      50,000    Pac-West Telecomm, Inc., 13.50%
                  senior notes, due 2/1/09 ...................            51,875

See Notes to Schedules of Investments.

40  Janus Aspen Series / December 31, 1999
<PAGE>

SCHEDULE OF INVESTMENTS (continued)

Shares or Principal Amount                                          Market Value
================================================================================
Fiber Optics - 1.0%
$     15,000    NorthEast Optic Network, Inc., 12.75%
                  senior notes, due 8/15/08 ..................    $       16,013

Food - Retail - 1.1%
      15,000    Carrols Corp., 9.50%
                  company guaranteed notes, due 12/1/08 ......            13,762
       5,000    Stater Brothers Holdings, Inc., 10.75%
                  senior notes, due 8/15/06 ..................             5,013

                                                                          18,775

Gambling - Non-Hotel Casinos - 3.1%
      50,000    Louisiana Casino Cruises, Inc., 11.00%
                  notes, due 12/1/05 .........................            51,375

Home Decorating Products - 0.6%
      15,000    Frank's Nursery & Crafts, Inc., 10.25%
                  senior subordinated notes, due 3/1/08 ......            10,162

Internet Software - 1.9%
      15,000    Exodus Communications, Inc., 11.25%
                  senior notes, due 7/1/08 ...................            15,562
      15,000    PSINet, Inc., 11.00%
                  senior notes, due 8/1/09 ...................            15,488

                                                                          31,050

Leisure, Recreation and Gaming - 1.8%
      40,000    Hard Rock Hotel, Inc., 9.25%
                  senior subordinated notes, due 4/1/05 ......            29,100

Music/Clubs - 1.4%
      25,000    SFX Entertainment, Inc., 9.125%
                  company guaranteed notes, due 2/1/08 .......            23,625

Radio - 1.6%
      25,000    Cumulus Media, Inc., 10.375%
                  company guaranteed notes, due 7/1/08 .......            25,937

Real Estate Investment and Management - 2.4%
      40,000    LNR Property Corp., 10.50%
                  senior subordinated notes, due 1/15/09 .....            39,550

Retail - Restaurants - 1.5%
      25,000    Perkins Family Restaurant L.P., 10.125%
                  senior notes, due 12/15/07 .................            25,188

Telecommunication Equipment - 0.6%
      10,000    Covad Communications Group, Inc., 12.50%
                  senior notes, due 2/15/09 ..................            10,400

Telecommunication Services - 16.1%
      30,000    Alaska Communications Systems, Inc., 9.375%
                  company guaranteed notes, due 5/15/09 ......            29,025
      15,000    CapRock Communications Corp., 11.50%
                  senior notes, due 5/1/09 ...................            15,412
      25,000    Cencall Communications Corp., 10.125%
                  senior discount notes, due 1/15/04 .........            25,781
      50,000    Galaxy Telecom L.P., 12.375%
                  senior subordinated notes, due 10/1/05 .....            53,125
      20,000    Global Crossing Holding, Ltd., 9.625%
                  company guaranteed notes, due 5/15/08 ......            19,900
      40,000    ITC DeltaCom, Inc., 11.00%
                  senior notes, due 6/1/07 ...................            42,400
      30,000    NTL, Inc., 12.75%
                  senior notes, due 4/15/05 ..................            30,112
      20,000    Versatel Telecom B.V., 13.25%
                  senior notes, due 5/15/08 ..................            21,350
      25,000    Worldwide Fiber, Inc., 12.00%
                  senior notes, due 8/1/09+ ..................            26,000

                                                                         263,105

Telephone - Long Distance - 0.7%
$     10,000    Qwest Communications International, Inc.
                  10.875%, senior notes, due 4/1/07 ..........    $       11,075

Television - 1.6%
      25,000    Pegasus Communications Corp., 12.50%
                  senior subordinated notes, due 8/1/07+ .....            27,250

Textile - Products - 0.6%
      10,000    Collins & Aikman Floorcovering, Inc., 10.00%
                  senior subordinated notes, due 1/15/07 .....             9,800

Transportation - Services - 2.9%
      17,000    Atlantic Express Transportation Corp., 10.75%
                  company guaranteed notes, due 2/1/04 .......            16,532
      30,000    RailWorks Corp., 11.50%
                  company guaranteed notes, due 4/15/09 ......            30,375

                                                                          46,907

Wire and Cable Products - 1.3%
      20,000    International Wire Group, Inc., 11.75%
                  senior subordinated notes, due 6/1/05 ......            20,650

Wireless Equipment - 4.3%
                Nextel Communications, Inc.:
      45,000      9.75%, senior discount notes, due 8/15/04 ..            46,463
      25,000      9.375%, senior notes, due 11/15/09+ ........            24,563

                                                                          71,026
- --------------------------------------------------------------------------------
Total Corporate Bonds (cost $1,295,747) ......................         1,263,298
- --------------------------------------------------------------------------------
Common Stock - 0%
Containers - Paper and Plastic - 0%
          12    SF Holdings Group, Inc.+ (cost $0) ...........                 0
- --------------------------------------------------------------------------------
Preferred Stock - 0.7%
Radio - 0.7%
          11    Cumulus Media, Inc. - Series A, 13.75%
                  (cost $12,176) .............................            12,128
- --------------------------------------------------------------------------------
Warrants - 0.7%
Internet Software - 0.7%
          38    Bell Technology Group, Ltd. - expires 5/1/05*
                  (cost $0) ..................................            11,258
- --------------------------------------------------------------------------------
Repurchase Agreement - 19.2%
$    315,000    Deutsche Bank Securities, Inc., 4.55%
                  dated 12/31/99, maturing 1/3/00, to be
                  repurchased at $315,119 collateralized
                  by $82,343 in Fannie Mae, 4.005%-
                  7.00%, 11/18/15-5/25/29; $345,310 in
                  Freddie Mac, 0%-7.3262%, 12/15/12-
                  4/1/29; with respective values of $59,665
                  and $261,635 (cost $315,000) ...............           315,000
- --------------------------------------------------------------------------------
Total Investments (total cost $1,622,923) - 97.5% ............         1,601,684
- --------------------------------------------------------------------------------
Cash, Receivables and Other Assets, net of Liabilities - 2.5%             30,290
- --------------------------------------------------------------------------------
Net Assets - 100% ............................................    $    1,631,974
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

                                      Janus Aspen Series / December 31, 1999  41
<PAGE>

Janus | Aspen Money Market Portfolio

[PHOTO]
Sharon Pichler
portfolio manager

For the 12 months ended  December 31, 1999,  Janus Aspen Money Market  Portfolio
returned  4.98%  for its  Institutional  Shares  and  4.45%  for its  Retirement
Shares.(1) The seven-day  current yield for this same period was 5.70% and 5.20%
for  the  Institutional   Shares  and  Retirement  Shares,   respectively.   The
Portfolio's strong performance earned it a top-quartile ranking, placing it 14th
out of 101 U.S.  money  market  portfolios  tracked by Lipper,  Inc.,  a leading
mutual fund rating company.(2)

The U.S.  stock market  continued  to make  headlines,  gaining  altitude to the
extent that,  by year-end,  it had surpassed  its previous  highs.  This had the
obvious  effect of  increasing  investors'  preference  for  stocks  over  other
investment  alternatives.  It also gave the Federal  Reserve  further impetus to
raise  short-term  interest  rates,  which it did in June,  August  and again in
November,  attempting to keep a lid on inflation.  Other factors contributing to
the Fed's  preventive  measures  were tight  labor  markets,  a weak  dollar and
higher-trending prices for oil and other raw materials.  Needless to say, rising
interest rates were the biggest factors influencing money markets.

To a  lesser  degree,  anxiety  related  to the  Y2K  transition  and  potential
liquidity concerns also added to volatility in the money markets.  However, what
was anticipated to be "the most significant  event of the year" turned out to be
a nonevent and fund flows remained fairly normal through year-end.

Nonetheless,  in an attempt to cushion the  Portfolio  from any  unusual  market
turbulence,  we increased  our cash  holdings.  This strategy also allowed us to
take  advantage of buying  opportunities  in the three- to  four-month  maturity
range created by distortions in the interest rate environment.  These relatively
longer-term  securities  will  likely  mature  prior to  further  Fed action and
therefore will not prevent us from reinvesting at higher yields.

Going forward,  we will continue to keep a close eye on interest  rates. At this
writing,  inflation fears and the "wealth effect" - a sense of wealth created by
higher  stock  prices - both seem to have the Fed  leaning  toward  future  rate
increases.  That said,  the  Portfolio  will remain  liquid,  which  should help
cushion  performance  from  the  risk  of  higher  rates,  while  giving  us the
flexibility to respond to changing market conditions.

In closing,  we'd like to thank you for your continued investment and confidence
in Janus Aspen Money Market Portfolio.

Average Annual Total Return(1)
For the Periods Ended December 31, 1999
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 5/1/95)
  1 Year                                                      4.98%
  From Inception                                              5.18%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                                      4.45%
  From Portfolio Inception                                    4.37%
- --------------------------------------------------------------------------------
Returns shown for  Retirement  Shares for periods  prior to their  inception are
derived from the historical  performance of  Institutional  Shares,  adjusted to
reflect the higher operating expenses of Retirement Shares.

(1)  All returns reflect reinvested dividends.

(2)  Lipper,  Inc.  defines a U.S. money market portfolio as one that invests in
     "high-quality  financial  instruments  rated  in the  top two  grades  with
     dollar-denominated  average  maturities  of less  than 90  days"  and  that
     intends "to keep constant net asset value." As of December 31, 1999,  Janus
     Aspen Money Market  Portfolio  ranked 22/90 of U.S.  money market funds for
     the 3-year period. The ranking is for Institutional Shares.

An  investment in the  Portfolio(s)  is not insured or guaranteed by the Federal
Deposit  Insurance  Corporation  or any other  government  agency.  Although the
Portfolio(s)  seeks to preserve the value of your investment at $1.00 per share,
it is possible to lose money by investing in the Portfolio.

Past performance does not guarantee future results.

42  Janus Aspen Series / December 31, 1999
<PAGE>

SCHEDULE OF INVESTMENTS

Shares or Principal Amount                                          Market Value
================================================================================
Taxable Variable Rate Demand Notes - 32.7%
$  1,475,000    Arapahoe County, Colorado Industrial
                  Development Revenue, (Cottrell)
                  Series B, 5.95%, 10/1/19 ...................    $    1,475,000
   2,300,000    Asset Partners, Inc.
                  5.95%, 11/1/27 .............................         2,300,000
   3,200,000    Breckenridge Terrace L.L.C.
                  5.8775%, 5/1/39 ............................         3,200,000
     335,000    Chicago, Illinois Industrial Development
                  Revenue, (BTI, Inc. Project)
                  Series B, 5.98%, 9/1/273 ...................            35,000
   1,000,000    Colorado Housing and Finance Authority
                  Economic Development Revenue
                  (White Wave, Inc. Project), Series B
                  5.85%, 10/1/18 .............................         1,000,000
     470,000    Fort Wright, Kentucky Industrial Building
                  Revenue, (Wellels Properties)
                  6.50%, 6/1/19 ..............................           470,000
     285,000    Fresno, California Multi-Family Housing
                  Revenue, (Sunrise Fresno), Series B
                  6.25%, 12/1/26 .............................           285,000
     900,000    Industrial Dimensions, Inc.
                  6.50%, 1/1/14 ..............................           900,000
   3,400,000    Lee County, Florida Industrial Development
                  Authority Health Care Facilities Revenue
                  (Bonita Community), Series B
                  6.50%, 12/1/29 .............................         3,400,000
   1,200,000    Michigan City Industrial Economic
                  Development Revenue, (Cons Biscuit
                  Co. Project), 6.50%, 10/1/13 ...............         1,200,000
     110,000    Michigan State Strategic Fund Limited
                  Obligation Revenue, (Wade Trim Group)
                  5.70%, 12/1/16 .............................           110,000
   5,200,000    Montgomery, Alabama Industrial Development
                  Board Revenue, (Jenkins Brick Co.)
                  Series A, 6.08%, 9/1/14 ....................         5,200,000
     480,000    Neill-Lavielle Supply Co.
                  6.50%, 5/1/08 ..............................           480,000
   1,675,000    Phoenix, Illinois Realty Special Account
                  Multi-Family Revenue, (Brightons Mark)
                  6.00%, 4/1/20 ..............................         1,675,000
   1,000,000    Washington, Missouri Industrial Development
                  Authority Revenue, (Pauwels Project)
                  5.95%, 12/1/19 .............................         1,000,000
- --------------------------------------------------------------------------------
Total Taxable Variable Rate Demand Notes (cost $23,030,000) ..        23,030,000
- --------------------------------------------------------------------------------
Floating Rate Notes - 29.3%
   2,000,000    American Express Centurion Bank
                  5.70%, 4/27/00 .............................         2,000,000
   2,000,000    Bankers Trust Company, New York
                  5.70%, 5/15/00 .............................         1,999,707
   2,000,000    Bayerische Landesbank, New York
                  5.75%, 8/2/00 ..............................         1,999,408
   2,000,000    Comerica Bank, Detroit
                  5.66%, 6/12/00 .............................         1,999,564
     650,000    First National Bank, Chicago
                  5.63%, 4/13/00 .............................           649,686
   2,000,000    General Motors Acceptance Mortgage Corp.
                  5.76%, 3/14/00 .............................         2,000,039
   2,000,000    Homeside Lending, Inc.
                  6.2712%, 8/16/00 ...........................         2,000,000
   2,000,000    Medical Properties, Inc.
                  7.00%, 12/22/24 ............................         2,000,000
Floating Rate Notes - (continued)
$  2,000,000    National Bank of Commerce
                  6.5112%, 7/18/00 ...........................    $    1,998,925
   2,000,000    Norwest Financial, Inc.
                  5.675%, 7/7/00 .............................         1,999,546
   2,000,000    SouthTrust Bank N.A.
                  5.64%, 5/17/00 .............................         1,999,559
- --------------------------------------------------------------------------------
Total Floating Rate Notes (cost $20,646,434) .................        20,646,434
- --------------------------------------------------------------------------------
Certificates of Deposit - 19.9%
   2,000,000    Barclays Bank PLC
                  5.90%, 10/2/00 .............................         1,997,755
   2,000,000    Commerzbank A.G., New York
                  5.09%, 4/12/00 .............................         1,999,326
   1,000,000    Compagnie Fananciere
                  6.39%, 12/20/00 ............................           999,908
   2,000,000    Merita Bank, Ltd., New York
                  6.17%, 1/21/00 .............................         2,000,000
   2,000,000    National Bank of Canada, New York
                  5.61%, 6/12/00 .............................         1,999,657
   1,000,000    Regions Bank
                  6.09%, 10/10/00 ............................           999,556
   1,000,000    Royal Bank of Canada, New York
                  5.12%, 3/21/00 .............................           999,869
   2,000,000    Skandinaviska Enskilda Banken
                  5.96%, 8/10/00 .............................         1,999,535
   1,000,000    Svenska Handelsbanken, New York
                  5.22%, 5/10/00 .............................           999,829
- --------------------------------------------------------------------------------
Total Certificates of Deposit (cost $13,995,435) .............        13,995,435
- --------------------------------------------------------------------------------
Put Bond - 3.9%
   2,765,000    Aurora, Colorado Centertech Metropolitan
                  District, Series B, 6.65%, 12/1/00+
                  (cost $2,765,000) ..........................         2,765,000
- --------------------------------------------------------------------------------
Repurchase Agreement - 15.6%
  11,000,000    Morgan Stanley Dean Witter & Co., 5.25%
                  dated 12/31/99, maturing 1/3/00, to be
                  repurchased at $11,004,813 collateralized
                  by $794,346 in Fannie Mae, 6.00% - 9.50%,
                  5/25/06-3/25/23; $15,430,314 in Freddie
                  Mac, 0%-8.50%, 4/15/03- 11/15/29;
                  $966,842 in Ginnie Mae, 5.7437%-5.80%,
                  7/16/22-2/16/26; with respective values
                  of $770,359, $9,567,340, and $922,446
                  (cost $11,000,000) .........................        11,000,000
- --------------------------------------------------------------------------------
Total Investments (total cost $71,436,869) - 101.4% ..........        71,436,869
- --------------------------------------------------------------------------------
Liabilities, net of Cash, Receivables and Other Assets - (1.4%)      (1,018,143)
- --------------------------------------------------------------------------------
Net Assets - 100% ............................................    $   70,418,726
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

                                      Janus Aspen Series / December 31, 1999  43
<PAGE>

Statements of | Operations

<TABLE>
<CAPTION>
                                                                                          Janus Aspen    Janus Aspen
                                                                           Janus Aspen    Aggressive       Capital
For the fiscal year ended  December 31, 1999                                 Growth         Growth      Appreciation
(all numbers in thousands)                                                  Portfolio      Portfolio      Portfolio
- --------------------------------------------------------------------------------------------------------------------
Investment Income:
<S>                                                                        <C>            <C>            <C>
  Interest                                                                 $    11,575    $     1,877    $     3,096
  Dividends                                                                      5,664            966            720
  Foreign tax withheld                                                            (61)            (6)           (10)
- --------------------------------------------------------------------------------------------------------------------
Total Investment Income                                                         17,178          2,837          3,806
- --------------------------------------------------------------------------------------------------------------------
Expenses:
  Advisory fees                                                                 11,643         10,081          1,716
  Transfer agent expenses                                                            1              2              1
  Registration fees                                                                 91             75             51
  System fees                                                                       20             22             14
  Custodian fees                                                                   149            130             32
  Insurance expense                                                                  6              6             --
  Audit fees                                                                        14             17             13
  Distribution fees - Retirement Shares                                             31             24             11
  Administrative fees - Retirement Shares                                           31             24             11
  Other expenses                                                                     8             10              3
- --------------------------------------------------------------------------------------------------------------------
Total Expenses                                                                  11,994         10,391          1,852
- --------------------------------------------------------------------------------------------------------------------
Expense and Fee Offsets                                                           (25)           (31)            (3)
- --------------------------------------------------------------------------------------------------------------------
Net Expenses                                                                    11,969         10,360          1,849
- --------------------------------------------------------------------------------------------------------------------
Excess Expense Reimbursement                                                        --             --             --
- --------------------------------------------------------------------------------------------------------------------
Net Expenses After Reimbursement                                                11,969         10,360          1,849
- --------------------------------------------------------------------------------------------------------------------
Net Investment Income/(Loss)                                                     5,209        (7,523)          1,957
- --------------------------------------------------------------------------------------------------------------------
Net Realized and Unrealized Gain/(Loss) on Investments:
  Net realized gain/(loss) from securities transactions                        155,387        392,442          3,659
  Net realized gain/(loss) from foreign currency transactions                     (28)            354             --
  Net realized gain/(loss) from futures contracts                                   --             --             --
  Change in net unrealized appreciation or
    depreciation of investments and foreign currency                           582,872      1,148,333        169,996
- --------------------------------------------------------------------------------------------------------------------
Net Gain/(Loss) on Investments                                                 738,231      1,541,129        173,655
- --------------------------------------------------------------------------------------------------------------------
Net Increase in Net Assets Resulting from Operations                       $   743,440    $ 1,533,606    $   175,612
- --------------------------------------------------------------------------------------------------------------------

See Notes to Financial Statements.

44  Janus Aspen Series / December 31, 1999
<PAGE>

<CAPTION>
 Janus Aspen   Janus Aspen                   Janus Aspen    Janus Aspen    Janus Aspen
International   Worldwide     Janus Aspen      Equity       Growth and      Flexible      Janus Aspen    Janus Aspen
  Growth         Growth        Balanced        Income         Income         Income       High-Yield    Money Market
 Portfolio      Portfolio      Portfolio      Portfolio      Portfolio      Portfolio      Portfolio      Portfolio
- --------------------------------------------------------------------------------------------------------------------

<C>            <C>            <C>            <C>            <C>            <C>            <C>            <C>
$     1,680    $    13,844    $    48,392    $        98    $       379    $    12,342    $       230    $     2,956
      3,031         24,223          8,855            133            118            124              2             --
      (316)        (2,468)           (35)            (1)             --             --             --             --
- --------------------------------------------------------------------------------------------------------------------
      4,395         35,599         57,212            230            497         12,466            232          2,956
- --------------------------------------------------------------------------------------------------------------------

      2,829         25,509         10,805            106            202          1,051             18            138
          2              3             --              1              1              1              1              3
         61            170             76             43             53             52             48             60
         18             21             21              8             12             15             13             15
        355          1,840            152             30             47             38             25              5
          1             12              4             --             --              1             --             --
         12             19             15              9              5             12             12             15
          9            123             71             --              5             --             --             --
          9            123             71             --              5             --             --             --
         11             52              9              3              3              2              4              3
- --------------------------------------------------------------------------------------------------------------------
      3,307         27,872         11,224            200            333          1,172            121            239
- --------------------------------------------------------------------------------------------------------------------
        (5)           (23)           (24)             --            (1)            (6)             --             --
- --------------------------------------------------------------------------------------------------------------------
      3,302         27,849         11,200            200            332          1,166            121            239
- --------------------------------------------------------------------------------------------------------------------
         --             --             --           (15)             --             --           (96)             --
- --------------------------------------------------------------------------------------------------------------------
      3,302         27,849         11,200            185            332          1,166             25            239
- --------------------------------------------------------------------------------------------------------------------
      1,093          7,750         46,012             45            165         11,300            207          2,717
- --------------------------------------------------------------------------------------------------------------------

     10,284        194,017        181,255          2,283          2,395        (3,573)          (113)              3
    (1,431)        (8,011)          (739)            (4)             --          (176)             --             --
        522          4,995             --             --             --            411             --             --

    333,771      2,184,175        185,339          2,881         22,577        (5,120)             55             --
- --------------------------------------------------------------------------------------------------------------------
    343,146      2,375,176        365,855          5,160         24,972        (8,458)           (58)              3
- --------------------------------------------------------------------------------------------------------------------
$   344,239    $ 2,382,926    $   411,867    $     5,205    $    25,137    $     2,842    $       149    $     2,720
- --------------------------------------------------------------------------------------------------------------------
</TABLE>

                                      Janus Aspen Series / December 31, 1999  45
<PAGE>

Statements of | Assets & Liabilities

<TABLE>
<CAPTION>
                                                                                     Janus Aspen   Janus Aspen
                                                                       Janus Aspen   Aggressive      Capital
As of December 31, 1999 (all numbers in thousands                        Growth        Growth      Appreciation
except net asset value per share)                                       Portfolio     Portfolio     Portfolio
- --------------------------------------------------------------------------------------------------------------
Assets:
<S>                                                                    <C>           <C>           <C>
  Investments at cost                                                  $ 2,100,829   $ 1,977,940   $   458,531

  Investments at value:                                                $ 3,004,872   $ 3,373,868   $   648,699
    Cash                                                                       154           156           198
    Receivables:
      Investments sold                                                       3,705           133            --
      Portfolio shares sold                                                  7,357         9,049         2,983
      Dividends                                                                475            14            67
      Interest                                                                 275            10            17
    Other assets                                                                 2             2             1
    Variation margin                                                            --            --            --
  Forward currency contracts                                                   160            --            --
- --------------------------------------------------------------------------------------------------------------
Total Assets                                                             3,017,000     3,383,232       651,965
- --------------------------------------------------------------------------------------------------------------
Liabilities:
  Payables:
    Investments purchased                                                   12,576            --            --
    Portfolio shares repurchased                                               827        13,928         1,491
    Advisory fees                                                            1,538         1,695           311
  Accrued expenses                                                              76            62            23

  Due to Advisor                                                                --            --            --
- --------------------------------------------------------------------------------------------------------------
Total Liabilities                                                           15,017        15,685         1,825
- --------------------------------------------------------------------------------------------------------------
Net Assets                                                             $ 3,001,983   $ 3,367,547   $   650,140
- --------------------------------------------------------------------------------------------------------------
Net Assets - Institutional Shares                                      $ 2,942,649   $ 3,319,619   $   626,611
  Shares Outstanding, $0.001 Par Value (unlimited shares authorized)        87,457        55,608        18,894
- --------------------------------------------------------------------------------------------------------------
  Net Asset Value Per Share                                            $     33.65   $     59.70   $     33.17
- --------------------------------------------------------------------------------------------------------------
Net Assets - Retirement Shares                                         $    59,334   $    47,928   $    23,529
  Shares Outstanding, $0.001 Par Value (unlimited shares authorized)         1,765           814           713
- --------------------------------------------------------------------------------------------------------------
  Net Asset Value Per Share                                            $     33.63   $     58.91   $     33.00
- --------------------------------------------------------------------------------------------------------------
</TABLE>

See Notes to Financial Statements.

46  Janus Aspen Series / December 31, 1999
<PAGE>

<TABLE>
<CAPTION>
 Janus Aspen    Janus Aspen                Janus Aspen   Janus Aspen   Janus Aspen
International   Worldwide    Janus Aspen     Equity      Growth and     Flexible     Janus Aspen   Janus Aspen
   Growth        Growth       Balanced       Income        Income        Income       High-Yield   Money Market
  Portfolio     Portfolio     Portfolio     Portfolio     Portfolio     Portfolio     Portfolio     Portfolio
- --------------------------------------------------------------------------------------------------------------

<S>            <C>           <C>           <C>           <C>           <C>           <C>           <C>
 $   431,246   $ 3,661,297   $ 2,052,853   $    13,988   $    68,727   $   189,696   $     1,623   $    71,437

 $   819,808   $ 6,610,142   $ 2,432,313   $    19,243   $    92,309   $   186,090   $     1,602   $    71,437
         937         2,854         6,934            77           176           461            --            23
       3,263        34,817        59,675           320           495         1,912             1            --
       4,557        29,544         7,520             1           819           306            --         1,263
         594         3,883         1,008             8            17            --            --            --
           9            51        20,235            35            35         3,603            35           638
           2             5             1            --            --            --             2            --
          --            --            --            --            --           115            --            --
         897         8,689           504             3            --           459            --            --
- --------------------------------------------------------------------------------------------------------------
     830,067     6,689,985     2,528,190        19,687        93,851       192,946         1,640        73,361
- --------------------------------------------------------------------------------------------------------------
         790         4,144        19,153           172         1,950         4,994            --            --
       1,445        11,097           969            48           379           321            --         2,908
         404         3,333         1,335            11            45           103            --            14
          50           239            56            10            15             5             8            20

          --            --            --             7            --            --            --            --
- --------------------------------------------------------------------------------------------------------------
       2,689        18,813        21,513           248         2,389         5,423             8         2,942
- --------------------------------------------------------------------------------------------------------------
 $   827,378   $ 6,671,172   $ 2,506,677   $    19,439   $    91,462   $   187,523   $     1,632   $    70,419
- --------------------------------------------------------------------------------------------------------------
 $   810,392   $ 6,496,773   $ 2,453,079   $    18,975   $    84,480   $   186,681   $     1,620   $    69,266
      20,955       136,049        87,880           695         4,067        16,357           155        69,266
- --------------------------------------------------------------------------------------------------------------
 $     38.67   $     47.75   $     27.91   $     27.32   $     20.77   $     11.41   $     10.45   $      1.00
- --------------------------------------------------------------------------------------------------------------
 $    16,986   $   174,399   $    53,598   $       464   $     6,982   $       842   $        12   $     1,153
         441         3,667         1,912            17           338            72             1         1,153
- --------------------------------------------------------------------------------------------------------------
 $     38.56   $     47.56   $     28.04   $     27.07   $     20.68   $     11.72   $     10.67   $      1.00
- --------------------------------------------------------------------------------------------------------------
</TABLE>

                                      Janus Aspen Series / December 31, 1999  47
<PAGE>

Statements of | Changes in Net Assets

<TABLE>
<CAPTION>
                                                            Janus Aspen               Janus Aspen               Janus Aspen
                                                              Growth               Aggressive Growth        Capital Appreciation
For the fiscal year or period ended December 31              Portfolio                 Portfolio                 Portfolio
(all numbers in thousands)                               1999         1998         1999         1998         1999         1998
- ---------------------------------------------------------------------------------------------------------------------------------
Operations:
<S>                                                   <C>          <C>          <C>          <C>          <C>          <C>
  Net investment income/(loss)                        $    5,209   $    2,061   $  (7,523)   $  (2,059)   $    1,957   $       70
  Net realized gain/(loss) from
    investment transactions                              155,359        9,731      392,796       62,166        3,659      (3,801)
  Change in unrealized net appreciation or
    depreciation of investments and foreign currency     582,872      246,903    1,148,333      133,925      169,996       19,907
- ---------------------------------------------------------------------------------------------------------------------------------
Net Increase in Net Assets Resulting from Operations     743,440      258,695    1,533,606      194,032      175,612       16,176
- ---------------------------------------------------------------------------------------------------------------------------------
Dividends and Distributions to Shareholders:
  Net investment income*                                 (4,543)      (1,969)           --           --      (1,635)         (40)
  Net realized gain from investment transactions*        (9,036)     (48,597)     (52,162)           --           --           --
  Distributions (in excess of realized gains)*                --           --           --           --           --           --
- ---------------------------------------------------------------------------------------------------------------------------------
Net Decrease from Dividends and Distributions           (13,579)     (50,566)     (52,162)           --      (1,635)         (40)
- ---------------------------------------------------------------------------------------------------------------------------------
Capital Share Transactions:
  Shares sold
    Institutional Shares                               1,298,997      375,818    1,695,094      388,732      425,454       78,521
    Retirement Shares                                     52,393            2       34,652           --       21,310           --
  Reinvested dividends and distributions
    Institutional Shares                                  13,566       50,565       52,029           --        1,635           40
    Retirement Shares                                         13            1          133           --           --           --
  Shares repurchased
    Institutional Shares                               (194,056)    (139,241)    (665,828)    (318,015)     (44,052)     (27,336)
    Retirement Shares                                    (2,358)           --      (2,937)           --      (2,391)           --
- ---------------------------------------------------------------------------------------------------------------------------------
Net Increase/(Decrease) from
  Capital Share Transactions                           1,168,555      287,145    1,113,143       70,717      401,956       51,225
- ---------------------------------------------------------------------------------------------------------------------------------
Net Increase/(Decrease) in Net Assets                  1,898,416      495,274    2,594,587      264,749      575,933       67,361
Net Assets:
  Beginning of period                                  1,103,567      608,293      772,960      508,211       74,207        6,846
- ---------------------------------------------------------------------------------------------------------------------------------
  End of period                                       $3,001,983   $1,103,567   $3,367,547   $  772,960   $  650,140   $   74,207
- ---------------------------------------------------------------------------------------------------------------------------------
Net Assets Consist of:
  Capital (par value and paid-in surplus)*            $1,941,557   $  773,002   $1,588,397   $  475,254   $  459,904   $   57,948
  Undistributed net investment income/(loss)*                864          210          (2)          (6)          356           34
  Undistributed net realized gain/
    (loss) from investments*                             155,363        9,028      383,226       50,119        (288)      (3,947)
  Unrealized appreciation/(depreciation)
    of investments and foreign currency                  904,199      321,327    1,395,926      247,593      190,168       20,172
                                                      $3,001,983   $1,103,567   $3,367,547   $  772,960   $  650,140   $   74,207
Transactions in Portfolio Shares -
 Institutional Shares
  Shares sold                                             47,425       18,605       45,266       17,430       16,966        4,982
  Reinvested dividends and distributions                     486        2,441        1,555           --           55            2
- ---------------------------------------------------------------------------------------------------------------------------------
Total                                                     47,911       21,046       46,821       17,430       17,021        4,984
- ---------------------------------------------------------------------------------------------------------------------------------
Shares Repurchased                                       (7,339)      (7,082)     (19,177)     (14,193)      (1,847)      (1,805)
Net Increase/(Decrease) in Portfolio Shares               40,572       13,964       27,644        3,237       15,174        3,179
Shares Outstanding, Beginning of Period                   46,885       32,921       27,964       24,727        3,720          541
- ---------------------------------------------------------------------------------------------------------------------------------
Shares Outstanding, End of Period                         87,457       46,885       55,608       27,964       18,894        3,720
- ---------------------------------------------------------------------------------------------------------------------------------
Transactions in Portfolio Shares -
 Retirement Shares(2)
  Shares sold                                          1,844,663           79      872,484           --      805,168           --
  Reinvested dividends and distributions                     475           40        4,023           --           --           --
- ---------------------------------------------------------------------------------------------------------------------------------
Total                                                  1,845,138          119      876,507           --      805,168           --
- ---------------------------------------------------------------------------------------------------------------------------------
Shares Repurchased                                      (81,361)           --     (63,544)           --     (93,123)           --
Net Increase/(Decrease) in Portfolio Shares            1,763,777          119      812,963           --      712,045           --
Shares Outstanding, Beginning of Period                      754          635          620          620        1,000        1,000
- ---------------------------------------------------------------------------------------------------------------------------------
Shares Outstanding, End of Period                      1,764,531          754      813,583          620      713,045        1,000
- ---------------------------------------------------------------------------------------------------------------------------------
Purchases and Sales of Investment Securities:
 (excluding short-term securities)
  Purchases of securities                             $1,792,760   $  747,926   $2,594,856   $  795,996   $  380,037   $   65,706
  Proceeds from sales of securities                      845,225      531,213    1,580,979      747,773      105,924       20,828
  Purchases of long-term
    U.S. government obligations                               --           --           --           --           --           --
  Proceeds from sales of long-term
    U.S. government obligations                               --           --           --           --           --           --
</TABLE>

*See Note 3 in Notes to Financial Statements.

(1)  Period May 1, 1998, (inception) to December 31, 1998.

See Notes to Financial Statements.

48  Janus Aspen Series / December 31, 1999
<PAGE>

<TABLE>
<CAPTION>
     Janus Aspen            Janus Aspen            Janus Aspen        Janus Aspen        Janus Aspen         Janus Aspen
International Growth      Worldwide Growth          Balanced         Equity Income     Growth and Income   Flexible Income
      Portfolio              Portfolio              Portfolio          Portfolio          Portfolio           Portfolio
  1999        1998       1999        1998        1999       1998     1999     1998      1999    1998(1)    1999      1998
- ---------------------------------------------------------------------------------------------------------------------------
<S>        <C>        <C>         <C>         <C>         <C>       <C>      <C>      <C>       <C>      <C>       <C>
$   1,093  $   1,703  $    7,750  $   14,085  $   46,012  $ 13,428  $    45  $    10  $    165  $    13  $ 11,300  $  5,513

    9,375   (14,669)     191,001    (60,752)     180,516     (989)    2,279       65     2,395    (119)   (3,338)       964

  333,771     43,585   2,184,175     569,104     185,339   174,276    2,881    2,297    22,577     1005   (5,120)       680
- ---------------------------------------------------------------------------------------------------------------------------
  344,239     30,619   2,382,926     522,437     411,867   186,715    5,205    2,372    25,137      899     2,842     7,157
- ---------------------------------------------------------------------------------------------------------------------------

  (1,019)    (1,573)     (6,818)    (15,228)    (42,435)  (13,267)     (38)      (9)     (137)     (11)  (11,043)   (5,587)
       --         --          --          --          --  (12,240)     (59)     (74)        --       --     (977)     (704)
       --    (3,097)          --    (69,710)          --     (987)       --       --        --       --        --        --
- ---------------------------------------------------------------------------------------------------------------------------
  (1,019)    (4,670)     (6,818)    (84,938)    (42,435)  (26,494)     (97)     (83)     (137)     (11)  (12,020)   (6,291)
- ---------------------------------------------------------------------------------------------------------------------------


  438,134    265,075   2,167,550   1,208,930   1,279,277   390,880    9,006    6,139    59,997    6,714    92,026    84,767
   12,225          4     137,824       5,082      34,954    15,037      382       --     6,207       10       872        --

    1,018      4,670       6,818      84,904      41,850    26,417       97       83       137       11    12,003     6,290
        1         --          --          34         585        77       --       --        --       --        17         1

(277,609)  (145,673)   (898,433)   (417,023)   (112,729)  (54,219)  (4,176)  (2,534)   (5,500)  (1,198)  (37,764)  (16,439)
    (738)         --    (14,907)       (165)     (6,449)   (1,077)     (15)       --     (804)       --      (47)        --
- ---------------------------------------------------------------------------------------------------------------------------

  173,031    124,076   1,398,852     881,762   1,237,488   377,115    5,294    3,688    60,037    5,537    67,107    74,619
- ---------------------------------------------------------------------------------------------------------------------------
  516,251    150,025   3,774,960   1,319,261   1,606,920   537,336   10,402    5,977    85,037    6,425    57,929    75,485

  311,127    161,102   2,896,212   1,576,951     899,757   362,421    9,037    3,060     6,425       --   129,594    54,109
- ---------------------------------------------------------------------------------------------------------------------------
$ 827,378  $ 311,127  $6,671,172  $2,896,212  $2,506,677  $899,757  $19,439  $ 9,037  $ 91,462  $ 6,425  $187,523  $129,594
- ---------------------------------------------------------------------------------------------------------------------------

$ 446,243  $ 273,222  $3,608,193  $2,209,339  $1,943,324  $705,836  $11,892  $ 6,596  $ 65,574  $ 5,537  $193,256  $126,149
      169        114       1,072         400       4,104       527       11        5        30        2       392       169

  (8,482)   (17,886)     104,470    (86,790)     179,294   (1,222)    2,278       59     2,276    (119)   (3,384)       897

  389,448     55,677   2,957,437     773,263     379,955   194,616    5,258    2,377    23,582    1,005   (2,741)     2,379
$ 827,378  $ 311,127  $6,671,172  $2,896,212  $2,506,677  $899,757  $19,439  $ 9,037  $ 91,462  $ 6,425  $187,523  $129,594


   17,341     12,915      62,563      44,980      51,595    20,067      405      399     3,889      655     7,752     6,992
       44        212         209       2,966       1,581     1,279        4        5         7        1     1,047       525
- ---------------------------------------------------------------------------------------------------------------------------
   17,385     13,127      62,772      47,946      53,176    21,346      409      404     3,896      656     8,799     7,517
- ---------------------------------------------------------------------------------------------------------------------------
 (11,053)    (7,220)    (26,096)    (15,979)     (4,522)   (2,871)    (179)    (165)     (365)    (120)   (3,192)   (1,360)
    6,332      5,907      36,676      31,967      48,654    18,475      230      239     3,531      536     5,607     6,157
   14,623      8,716      99,373      67,406      39,226    20,751      465      226       536       --    10,750     4,593
- ---------------------------------------------------------------------------------------------------------------------------
   20,955     14,623     136,049      99,373      87,880    39,226      695      465     4,067      536    16,357    10,750
- ---------------------------------------------------------------------------------------------------------------------------


  466,618        201   3,868,907     188,749   1,385,492   815,403   16,783       --   392,132    1,000    73,392        --
       40          8          --       1,188      22,009     3,415        5       13        --       --     1,470        57
- ---------------------------------------------------------------------------------------------------------------------------
  466,658        209   3,868,907     189,937   1,407,501   818,818   16,788       13   392,132    1,000    74,862        57
- ---------------------------------------------------------------------------------------------------------------------------
 (26,923)         --   (403,114)     (6,322)   (259,945)  (55,344)    (662)       --  (55,446)       --   (4,008)        --
  439,735        209   3,465,793     183,615   1,147,556   763,474   16,126       13   336,686    1,000    70,854        57
      808        599     200,866      17,251     764,143       669    1,013    1,000     1,000       --       989       932
- ---------------------------------------------------------------------------------------------------------------------------
  440,543        808   3,666,659     200,866   1,911,699   764,143   17,139    1,013   337,686    1,000    71,843       989
- ---------------------------------------------------------------------------------------------------------------------------


$ 446,784  $ 295,506  $3,549,960  $2,082,135  $2,132,273  $608,627  $20,547  $ 7,825  $ 60,532  $ 5,637  $203,810  $140,772
$ 325,107    194,200   2,490,945   1,556,004   1,209,464   284,350   16,287    4,252    15,498    1,126   134,399    93,382

       --         --          --          --     479,559    76,402       --       --        --       --    21,790    37,749

       --         --          --          --     199,818    87,965       --       --        --       --    35,724    19,499
</TABLE>

(2)  Transactions  in Portfolio  Shares - Retirement  Shares  numbers are not in
     thousands.

                                      Janus Aspen Series / December 31, 1999  49
<PAGE>

Statements of | Changes in Net Assets (continued)

<TABLE>
<CAPTION>
                                                                   Janus Aspen                     Janus Aspen
                                                                   High-Yield                      Money Market
For the fiscal year or period ended December 31                     Portfolio                       Portfolio
(all numbers in thousands)                                    1999            1998            1999            1998
- ----------------------------------------------------------------------------------------------------------------------
Operations:
<S>                                                        <C>             <C>             <C>             <C>
  Net investment income/(loss)                             $       207     $       255     $     2,717     $     1,650
  Net realized gain/(loss) from investment transactions           (113)            (51)              3              --
  Change in unrealized net appreciation or depreciation
    of investments and foreign currency                             55            (141)             --              --
- ----------------------------------------------------------------------------------------------------------------------
Net Increase in Net Assets Resulting from Operations               149              63           2,720           1,650
- ----------------------------------------------------------------------------------------------------------------------
Dividends and Distributions to Shareholders:
  Net investment income*                                          (209)           (257)         (2,717)         (1,650)
  Net realized gain from investment transactions*                   --             (15)             (3)             --
  Distributions (in excess of realized gains)*                      --             (51)             --              --
- ----------------------------------------------------------------------------------------------------------------------
Net Decrease from Dividends and Distributions                     (209)           (323)         (2,720)         (1,650)
- ----------------------------------------------------------------------------------------------------------------------
Capital Share Transactions:
  Shares sold
    Institutional Shares                                         1,725           4,244         211,038         132,432
    Retirement Shares                                               --              --           1,225              --
  Reinvested dividends and distributions
    Institutional Shares                                           208             322           2,713           1,650
    Retirement Shares                                                1               1               7              --
  Shares repurchased
    Institutional Shares                                        (3,230)         (4,244)       (183,175)       (110,765)
    Retirement Shares                                               --              --             (90)             --
- ----------------------------------------------------------------------------------------------------------------------
Net Increase/(Decrease) from Capital Share Transactions         (1,296)            323          31,718          23,317
- ----------------------------------------------------------------------------------------------------------------------
Net Increase/(Decrease) in Net Assets                           (1,356)             63          31,718          23,317
Net Assets:
  Beginning of period                                            2,988           2,925          38,701          15,384
- ----------------------------------------------------------------------------------------------------------------------
  End of period                                            $     1,632     $     2,988     $    70,419     $    38,701
- ----------------------------------------------------------------------------------------------------------------------
Net Assets Consist of:
  Capital (par value and paid-in surplus)*                 $     1,811     $     3,106     $    70,419     $    38,701
  Undistributed net investment income/(loss)*                        6               8              --              --
  Undistributed net realized gain/
    (loss) from investments*                                      (164)            (50)             --              --
  Unrealized appreciation/(depreciation)
    of investments and foreign currency                            (21)            (76)             --              --
                                                           $     1,632     $     2,988     $    70,419     $    38,701
Transactions in Portfolio Shares -
 Institutional Shares
  Shares sold                                                      156             356         211,038         132,432
  Reinvested dividends and distributions                            20              28           2,713           1,650
- ----------------------------------------------------------------------------------------------------------------------
Total                                                              176             384         213,751         134,082
- ----------------------------------------------------------------------------------------------------------------------
Shares Repurchased                                                (295)           (357)      (183,175)       (110,766)
Net Increase/(Decrease) in Portfolio Shares                       (119)             27          30,576          23,316
Shares Outstanding, Beginning of Period                            274             247          38,690          15,374
- ----------------------------------------------------------------------------------------------------------------------
Shares Outstanding, End of Period                                  155             274          69,266          38,690
- ----------------------------------------------------------------------------------------------------------------------
Transactions in Portfolio Shares -
 Retirement Shares(1)
  Shares sold                                                       --              --       1,224,357              --
  Reinvested dividends and distributions                            83              89           7,522             496
- ----------------------------------------------------------------------------------------------------------------------
Total                                                               83              89       1,231,879             496
- ----------------------------------------------------------------------------------------------------------------------
Shares Repurchased                                                  --              --        (89,650)              --
Net Increase/(Decrease) in Portfolio Shares                         83              89       1,142,229             496
Shares Outstanding, Beginning of Period                          1,039             950          10,802          10,306
- ----------------------------------------------------------------------------------------------------------------------
Shares Outstanding, End of Period                                1,122           1,039       1,153,031          10,802
- ----------------------------------------------------------------------------------------------------------------------
Purchases and Sales of Investment Securities:
 (excluding short-term securities)
  Purchases of securities                                  $    12,244     $     8,323              --              --
  Proceeds from sales of securities                             13,089           9,612              --              --
  Purchases of long-term U.S. government obligations                50             640              --              --
  Proceeds from sales of long-term
    U.S. government obligations                                    148             536              --              --
</TABLE>

*See Note 3 in Notes to Financial Statements.

(1)  Transactions  in Portfolio  Shares - Retirement  Shares  numbers are not in
     thousands.

See Notes to Financial Statements.

50  Janus Aspen Series / December 31, 1999
<PAGE>

                                   Financial | Highlights - Institutional Shares

<TABLE>
<CAPTION>
For a share outstanding throughout,                                               Janus Aspen Growth Portfolio
each fiscal year ended December 31                              1999           1998           1997           1996           1995
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                                                          <C>            <C>            <C>            <C>            <C>
Net Asset Value, Beginning of Period                         $    23.54     $    18.48     $    15.51     $    13.45     $    10.57
- -----------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                                      .07            .05            .15            .17            .28
  Net gains/(losses) on securities
    (both realized and unrealized)                                10.24           6.36           3.34           2.29           2.90
- -----------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                                  10.31           6.41           3.49           2.46           3.18
- -----------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                          (.06)          (.05)          (.15)          (.17)          (.30)
  Distributions (from capital gains)                              (.14)         (1.30)          (.37)          (.23)            --
- -----------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                               (.20)         (1.35)          (.52)          (.40)          (.30)
- -----------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                               $    33.65     $    23.54     $    18.48     $    15.51     $    13.45
- -----------------------------------------------------------------------------------------------------------------------------------
Total Return                                                     43.98%         35.66%         22.75%         18.45%         30.17%
- -----------------------------------------------------------------------------------------------------------------------------------
Net Assets, End of Period (in thousands)                     $2,942,649     $1,103,549     $  608,281     $  325,789     $  126,911
Average Net Assets for the Period (in thousands)             $1,775,373     $  789,454     $  477,914     $  216,125     $   77,344
Ratio of Gross Expenses to Average Net Assets(1)                  0.67%          0.68%          0.70%          0.69%          0.78%
Ratio of Net Expenses to Average Net Assets(1)                    0.67%          0.68%          0.69%          0.69%          0.76%
Ratio of Net Investment Income to Average Net Assets              0.30%          0.26%          0.91%          1.39%          1.24%
Portfolio Turnover Rate                                             53%            73%           122%            87%           185%

<CAPTION>
For a share outstanding throughout                                          Janus Aspen Aggressive Growth Portfolio
each fiscal year ended December 31                              1999           1998           1997           1996           1995
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                                                          <C>            <C>            <C>            <C>            <C>
Net Asset Value, Beginning of Period                         $    27.64     $    20.55     $    18.24     $    17.08     $    13.62
- -----------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                                       --             --             --             --            .24
  Net gains/(losses) on securities
    (both realized and unrealized)                                33.46           7.09           2.31           1.36           3.47
- -----------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                                  33.46           7.09           2.31           1.36           3.71
- -----------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                             --             --             --             --          (.25)
  Distributions (from capital gains)                             (1.40)             --             --          (.19)             --
  Tax return of capital                                              --             --             --          (.01)             --
- -----------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                              (1.40)             --             --          (.20)          (.25)
- -----------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                               $    59.70     $    27.64     $    20.55     $    18.24     $    17.08
- -----------------------------------------------------------------------------------------------------------------------------------
Total Return                                                    125.40%         34.26%         12.66%          7.95%         27.48%
- -----------------------------------------------------------------------------------------------------------------------------------
Net Assets, End of Period (in thousands)                     $3,319,619     $  772,943     $  508,198     $  383,693     $  185,911
Average Net Assets for the Period (in thousands)             $1,476,445     $  576,444     $  418,464     $  290,629     $  107,582
Ratio of Gross Expenses to Average Net Assets(1)                  0.70%          0.75%          0.76%          0.76%          0.86%
Ratio of Net Expenses to Average Net Assets(1)                    0.69%          0.75%          0.76%          0.76%          0.84%
Ratio of Net Investment Income to Average Net Assets            (0.50)%        (0.36)%        (0.10)%        (0.27)%          0.58%
Portfolio Turnover Rate                                            105%           132%           130%            88%           155%
</TABLE>

(1) See footnote #5 in Notes to Financial Statements.

See Notes to Financial Statements.

                                      Janus Aspen Series / December 31, 1999  51
<PAGE>

Financial | Highlights - Institutional Shares (continued)

<TABLE>
<CAPTION>
For a share outstanding throughout                          Janus Aspen Capital Appreciation Portfolio
each fiscal year or period ended December 31                    1999           1998          1997(1)
- -----------------------------------------------------------------------------------------------------
<S>                                                          <C>            <C>            <C>
Net Asset Value, Beginning of Period                         $    19.94     $    12.62     $    10.00
- -----------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                                      .12            .01            .05
  Net gains/(losses) on securities
    (both realized and unrealized)                                13.22           7.32           2.61
- -----------------------------------------------------------------------------------------------------
Total from Investment Operations                                  13.34           7.33           2.66
- -----------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                          (.11)          (.01)          (.04)
  Distributions (from capital gains)                                 --             --             --
- -----------------------------------------------------------------------------------------------------
Total Distributions                                               (.11)          (.01)          (.04)
- -----------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                               $    33.17     $    19.94     $    12.62
- -----------------------------------------------------------------------------------------------------
Total Return*                                                    67.00%         58.11%         26.60%
- -----------------------------------------------------------------------------------------------------
Net Assets, End of Period (in thousands)                     $  626,611     $   74,187     $    6,833
Average Net Assets for the Period (in thousands)             $  257,422     $   25,964     $    2,632
Ratio of Gross Expenses to Average Net Assets**(2)                0.70%          0.92%          1.26%
Ratio of Net Expenses to Average Net Assets**(2)                  0.70%          0.91%          1.25%
Ratio of Net Investment Income to Average Net Assets**            0.76%          0.27%          1.43%
Portfolio Turnover Rate**                                           52%            91%           101%

<CAPTION>
For a share outstanding throughout                                         Janus Aspen International Growth Portfolio
each fiscal year ended December 31                              1999           1998           1997           1996           1995
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                                                          <C>            <C>            <C>            <C>            <C>
Net Asset Value, Beginning of Period                         $    21.27     $    18.48     $    15.72     $    11.95     $     9.72
- -----------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                                      .06            .13            .11            .05            .09
  Net gains/(losses) on securities
    (both realized and unrealized)                                17.40           3.07           2.80           4.06           2.16
- -----------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                                  17.46           3.20           2.91           4.11           2.25
- -----------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                          (.06)          (.14)          (.11)          (.11)          (.02)
  Distributions (from capital gains)                                 --             --          (.01)          (.23)             --
  Distributions (in excess of realized gains)                        --          (.27)          (.03)             --             --
- -----------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                               (.06)          (.41)          (.15)          (.34)          (.02)
- -----------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                               $    38.67     $    21.27     $    18.48     $    15.72     $    11.95
- -----------------------------------------------------------------------------------------------------------------------------------
Total Return                                                     82.27%         17.23%         18.51%         34.71%         23.15%
- -----------------------------------------------------------------------------------------------------------------------------------
Net Assets, End of Period (in thousands)                     $  810,392     $  311,110     $  161,091     $   27,192     $    1,608
Average Net Assets for the Period (in thousands)             $  425,876     $  234,421     $   96,164     $    7,437     $    1,792
Ratio of Gross Expenses to Average Net Assets(2)                  0.77%          0.86%          0.96%          1.26%          2.69%
Ratio of Net Expenses to Average Net Assets(2)                    0.76%          0.86%          0.96%          1.25%          2.50%
Ratio of Net Investment Income to Average Net Assets              0.26%          0.73%          0.70%          0.62%         (.80)%
Portfolio Turnover Rate                                             80%            93%            86%            65%           211%
</TABLE>

*Total return not annualized for periods of less than one full year.
**Annualized for periods of less than one full year.
(1)  Period May 1, 1997, (inception) to December 31, 1997
(2)  See footnote #5 in Notes to Financial Statements.

See Notes to Financial Statements.

52  Janus Aspen Series / December 31, 1999
<PAGE>

<TABLE>
<CAPTION>
For a share outstanding throughout                                          Janus Aspen Worldwide Growth Portfolio
each fiscal year ended December 31                              1999           1998           1997           1996           1995
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                                                          <C>            <C>            <C>            <C>            <C>
Net Asset Value, Beginning of Period                         $    29.09     $    23.39     $    19.44     $    15.31     $    12.07
- -----------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                                      .07            .16            .16            .16            .11
  Net gains/(losses) on securities
    (both realized and unrealized)                                18.65           6.59           4.14           4.27           3.19
- -----------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                                  18.72           6.75           4.30           4.43           3.30
- -----------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                          (.06)          (.18)          (.17)          (.17)          (.06)
  Dividends (in excess of net investment income)                     --             --          (.02)             --             --
  Distributions (from capital gains)                                 --             --          (.16)          (.13)             --
  Distributions (in excess of realized gains)                        --          (.87)             --             --             --
- -----------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                               (.06)         (1.05)          (.35)          (.30)          (.06)
- -----------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                               $    47.75     $    29.09     $    23.39     $    19.44     $    15.31
- -----------------------------------------------------------------------------------------------------------------------------------
Total Return                                                     64.45%         28.92%         22.15%         29.04%         27.37%
- -----------------------------------------------------------------------------------------------------------------------------------
Net Assets, End of Period (in thousands)                     $6,496,773     $2,890,375     $1,576,548     $  582,603     $  108,563
Average Net Assets for the Period (in thousands)             $3,862,773     $2,217,695     $1,148,951     $  304,111     $   59,440
Ratio of Gross Expenses to Average Net Assets(1)                  0.71%          0.72%          0.74%          0.80%          0.90%
Ratio of Net Expenses to Average Net Assets(1)                    0.71%          0.72%          0.74%          0.80%          0.87%
Ratio of Net Investment Income to Average Net Assets              0.20%          0.64%          0.67%          0.83%          0.95%
Portfolio Turnover Rate                                             67%            77%            80%            62%           113%

<CAPTION>
For a share outstanding throughout                                               Janus Aspen Balanced Portfolio
each fiscal year ended December 31                              1999           1998           1997           1996           1995
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                                                          <C>            <C>            <C>            <C>            <C>
Net Asset Value, Beginning of Period                         $    22.50     $    17.47     $    14.77     $    13.03     $    10.63
- -----------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                                      .59            .39            .34            .32            .17
  Net gains/(losses) on securities
    (both realized and unrealized)                                 5.38           5.51           2.89           1.81           2.45
- -----------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                                   5.97           5.90           3.23           2.13           2.62
- -----------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                          (.56)          (.38)          (.35)          (.30)          (.22)
  Distributions (from capital gains)                                 --          (.45)          (.18)          (.09)             --
  Distributions (in excess of realized gains)                        --          (.04)             --             --             --
- -----------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                               (.56)          (.87)         (0.53)          (.39)          (.22)
- -----------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                               $    27.91     $    22.50     $    17.47     $    14.77     $    13.03
- -----------------------------------------------------------------------------------------------------------------------------------
Total Return                                                     26.76%         34.28%         22.10%         16.18%         24.79%
- -----------------------------------------------------------------------------------------------------------------------------------
Net Assets, End of Period (in thousands)                     $2,453,079     $  882,495     $  362,409     $   85,480     $   14,021
Average Net Assets for the Period (in thousands)             $1,583,635     $  555,002     $  176,432     $   43,414     $    5,739
Ratio of Gross Expenses to Average Net Assets(1)                  0.69%          0.74%          0.83%          0.94%          1.37%
Ratio of Net Expenses to Average Net Assets(1)                    0.69%          0.74%          0.82%          0.92%          1.30%
Ratio of Net Investment Income to Average Net Assets              2.86%          2.41%          2.87%          2.92%          2.41%
Portfolio Turnover Rate                                             92%            70%           139%           103%           149%
</TABLE>

(1) See footnote #5 in Notes to Financial Statements.

                                      Janus Aspen Series / December 31, 1999  53
<PAGE>

Financial | Highlights - Institutional Shares (continued)

<TABLE>
<CAPTION>
For a share outstanding throughout                              Janus Aspen Equity Income Portfolio
each fiscal year or period ended December 31                    1999           1998          1997(1)
- -----------------------------------------------------------------------------------------------------
<S>                                                          <C>            <C>            <C>
Net Asset Value, Beginning of Period                         $    19.41     $    13.46     $    10.00
- -----------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                                      .07            .02            .01
  Net gains/(losses) on securities
    (both realized and unrealized)                                 7.99           6.16           3.46
- -----------------------------------------------------------------------------------------------------
Total from Investment Operations                                   8.06           6.18           3.47
- -----------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                          (.06)          (.02)          (.01)
  Distributions (from capital gains)                              (.09)          (.21)            --
- -----------------------------------------------------------------------------------------------------
Total Distributions                                               (.15)          (.23)          (.01)
- -----------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                               $    27.32     $    19.41     $    13.46
- -----------------------------------------------------------------------------------------------------
Total Return*                                                    41.58%         46.24%         34.70%
- -----------------------------------------------------------------------------------------------------
Net Assets, End of Period (in thousands)                     $   18,975     $    9,017     $    3,047
Average Net Assets for the Period (in thousands)             $   14,663     $    5,629     $    1,101
Ratio of Gross Expenses to Average Net Assets**(2)                1.25%          1.25%          1.25%
Ratio of Net Expenses to Average Net Assets**(2)                  1.25%          1.25%          1.25%
Ratio of Net Investment Income to Average Net Assets**            0.31%          0.17%          0.35%
Portfolio Turnover Rate**                                          114%            79%           128%

<CAPTION>
For a share outstanding throughout                   Janus Aspen Growth and Income Portfolio
each fiscal year or period ended December 31                    1999          1998(3)
- --------------------------------------------------------------------------------------
<S>                                                          <C>            <C>
Net Asset Value, Beginning of Period                         $    11.96     $    10.00
- --------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                                      .04            .02
  Net gains/(losses) on securities
    (both realized and unrealized)                                 8.81           1.96
- --------------------------------------------------------------------------------------
Total from Investment Operations                                   8.85           1.98
- --------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                          (.04)          (.02)
  Distributions (from capital gains)                                 --             --
- --------------------------------------------------------------------------------------
Total Distributions                                               (.04)          (.02)
- --------------------------------------------------------------------------------------
Net Asset Value, End of Period                               $    20.77     $    11.96
- --------------------------------------------------------------------------------------
Total Return*                                                    74.04%         19.80%
- --------------------------------------------------------------------------------------
Net Assets, End of Period (in thousands)                     $   84,480     $    6,413
Average Net Assets for the Period (in thousands)             $   28,838     $    2,883
Ratio of Gross Expenses to Average Net Assets**(2)                1.06%          1.25%
Ratio of Net Expenses to Average Net Assets**(2)                  1.05%          1.25%
Ratio of Net Investment Income to Average Net Assets**            0.56%          0.66%
Portfolio Turnover Rate**                                           59%            62%
</TABLE>

* Total return not annualized for periods of less than one full year.
**Annualized for periods of less than one full year.
(1) Period May 1, 1997, (inception) to December 31, 1997.
(2) See footnote #5 in Notes to Financial Statements.
(3) Period May 1, 1998, (inception) to December 31, 1998.

See Notes to Financial Statements.

54  Janus Aspen Series / December 31, 1999
<PAGE>

<TABLE>
<CAPTION>
For a share outstanding throughout                                           Janus Aspen Flexible Income Portfolio
each fiscal year ended December 31                              1999           1998           1997           1996           1995
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                                                          <C>            <C>            <C>            <C>            <C>
Net Asset Value, Beginning of Period                         $    12.05     $    11.78     $    11.24     $    11.11     $     9.48
- -----------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                                      .76            .64            .67            .74            .53
  Net gains/(losses) on securities
    (both realized and unrealized)                                (.58)            .41            .62            .24           1.70
- -----------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                                    .18           1.05           1.29            .98           2.23
- -----------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                          (.75)          (.67)          (.64)          (.72)          (.60)
  Distributions (from capital gains)                              (.07)          (.11)          (.11)          (.13)             --
- -----------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                               (.82)          (.78)          (.75)          (.85)          (.60)
- -----------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                               $    11.41     $    12.05     $    11.78     $    11.24     $    11.11
- -----------------------------------------------------------------------------------------------------------------------------------
Total Return                                                      1.60%          9.11%         11.76%          9.19%         23.86%
- -----------------------------------------------------------------------------------------------------------------------------------
Net Assets, End of Period (in thousands)                     $  186,681     $  129,582     $   54,098     $   25,315     $   10,831
Average Net Assets for the Period (in thousands)             $  161,459     $   86,627     $   36,547     $   17,889     $    5,556
Ratio of Gross Expenses to Average Net Assets(1)                  0.72%          0.73%          0.75%          0.84%          1.07%
Ratio of Net Expenses to Average Net Assets(1)                    0.72%          0.73%          0.75%          0.83%          1.00%
Ratio of Net Investment Income to Average Net Assets              6.99%          6.36%          6.90%          7.31%          7.46%
Portfolio Turnover Rate                                            116%           145%           119%           250%           236%

<CAPTION>
For a share outstanding throughout                                      Janus Aspen High-Yield Portfolio
each fiscal year or period ended December 31                    1999           1998           1997          1996(2)
- --------------------------------------------------------------------------------------------------------------------
<S>                                                          <C>            <C>            <C>            <C>
Net Asset Value, Beginning of Period                         $    10.85     $    11.78     $    10.83     $    10.00
- --------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                                     1.14            .87            .70            .43
  Net gains/(losses) on securities
    (both realized and unrealized)                                (.41)          (.70)            .99            .80
- --------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                                    .73            .17           1.69           1.23
- --------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                         (1.13)          (.89)          (.68)          (.40)
  Distributions (from capital gains)                                 --          (.05)          (.06)             --
  Distributions (in excess of realized gains)                        --          (.16)             --             --
- --------------------------------------------------------------------------------------------------------------------
Total Distributions                                              (1.13)         (1.10)          (.74)          (.40)
- --------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                               $    10.45     $    10.85     $    11.78     $    10.83
- --------------------------------------------------------------------------------------------------------------------
Total Return*                                                     6.85%          1.26%         15.98%         12.40%
- --------------------------------------------------------------------------------------------------------------------
Net Assets, End of Period (in thousands)                     $    1,620     $    2,977     $    2,914     $      783
Average Net Assets for the Period (in thousands)             $    2,448     $    3,281     $    1,565     $      459
Ratio of Gross Expenses to Average Net Assets**(1)                1.00%          1.00%          1.00%          1.01%
Ratio of Net Expenses to Average Net Assets**(1)                  1.00%          1.00%          1.00%          1.00%
Ratio of Net Investment Income to Average Net Assets**            8.41%          7.76%          7.98%          5.74%
Portfolio Turnover Rate**                                          554%           301%           299%           301%
</TABLE>

*Total return not annualized for periods of less than one full year.
**Annualized for periods of less than one full year.
(1) See footnote #5 in Notes to Financial Statements.
(2) Period May 1, 1996, (inception) to December 31, 1996.

                                      Janus Aspen Series / December 31, 1999  55
<PAGE>

Financial | Highlights - Institutional Shares (continued)

<TABLE>
<CAPTION>
For a share outstanding throughout                                             Janus Aspen Money Market Portfolio
each fiscal year or period ended December 31                    1999           1998           1997           1996          1995(1)
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                                                          <C>            <C>            <C>            <C>            <C>
Net Asset Value, Beginning of Period                         $     1.00     $     1.00     $     1.00     $     1.00     $     1.00
- -----------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                                      .05            .05            .05            .05            .04
  Net gains/(losses) on securities
    (both realized and unrealized)                                   --             --             --             --             --
- -----------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                                    .05            .05            .05            .05            .04
- -----------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                          (.05)          (.05)          (.05)          (.05)          (.04)
  Distributions (from capital gains)                                 --             --             --             --             --
- -----------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                               (.05)          (.05)          (.05)          (.05)          (.04)
- -----------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                               $     1.00     $     1.00     $     1.00     $     1.00     $     1.00
- -----------------------------------------------------------------------------------------------------------------------------------
Total Return*                                                     4.98%          5.36%          5.17%          5.05%          3.63%
- -----------------------------------------------------------------------------------------------------------------------------------
Net Assets, End of Period (in thousands)                     $   69,266     $   38,690     $   15,374     $    6,106     $    1,735
Average Net Assets for the Period (in thousands)             $   54,888     $   31,665     $    8,926     $    3,715     $    1,543
Ratio of Gross Expenses to Average Net Assets**(2)                0.43%          0.34%          0.50%          0.50%          0.50%
Ratio of Net Expenses to Average Net Assets**(2)                  0.43%          0.34%          0.50%          0.50%          0.50%
Ratio of Net Investment Income to Average Net Assets**            4.94%          5.21%          5.17%          4.93%          5.30%
</TABLE>

*Total return not annualized for periods of less than one full year.
**Annualized for periods of less than one full year.
(1)  Period May 1, 1995, (inception) to December 31, 1995.
(2)  See footnote #5 in Notes to Financial Statements.

See Notes to Financial Statements.

56  Janus Aspen Series / December 31, 1999
<PAGE>

                                      Financial | Highlights - Retirement Shares

<TABLE>
<CAPTION>
                                                                                                           Janus Aspen
For a share outstanding throughout                       Janus Aspen Growth Portfolio               Aggressive Growth Portfolio
each fiscal year or period ended December 31           1999          1998         1997(1)        1999          1998         1997(1)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                 <C>           <C>           <C>           <C>           <C>           <C>
Net Asset Value, Beginning of Period                $    23.45    $    18.46    $    16.18    $    27.42    $    20.49    $    16.12
- ------------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                             .07         (.03)           .04           .19         (.12)         (.06)
  Net gains/(losses) on securities                       10.25          6.32          2.71         32.70          7.05          4.43
    (both realized and unrealized)
- ------------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                         10.32          6.29          2.75         32.89          6.93          4.37
- ------------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                    --            --         (.10)            --            --            --
  Distributions (from capital gains)                     (.14)        (1.30)         (.37)        (1.40)            --            --
- ------------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                      (.14)        (1.30)         (.47)        (1.40)            --            --
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                      $    33.63    $    23.45    $    18.46    $    58.91    $    27.42    $    20.49
- ------------------------------------------------------------------------------------------------------------------------------------
Total Return*                                           44.12%        34.99%        17.22%       124.34%        33.58%        27.11%
- ------------------------------------------------------------------------------------------------------------------------------------
Net Assets, End of Period (in thousands)            $   59,334    $       18    $       12    $   47,928    $       17    $       13
Average Net Assets for the Period (in thousands)    $   12,209    $       13    $       11    $    9,786    $       14    $       11
Ratio of Gross Expenses to Average Net Assets**(2)       1.17%         1.18%         1.20%         1.19%         1.26%         1.32%
Ratio of Net Expenses to Average Net Assets**(2)         1.17%         1.18%         1.20%         1.19%         1.26%         1.32%
Ratio of Net Investment Income/
  (Loss) to Average Net Assets**                       (0.25)%       (0.23)%         0.29%       (1.00)%       (0.86)%       (0.62)%
Portfolio Turnover Rate**                                  53%           73%          122%          105%          132%          130%

<CAPTION>
                                                               Janus Aspen Capital                 Janus Aspen International
For a share outstanding throughout                           Appreciation Portfolio                     Growth Portfolio
each fiscal year or period ended December 31           1999          1998         1997(1)        1999          1998         1997(1)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                 <C>           <C>           <C>           <C>           <C>           <C>
Net Asset Value, Beginning of Period                $    19.86    $    12.62    $    10.00    $    21.27    $    18.44    $    16.80
- ------------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                           (.08)         (.04)           .12            --           .05           .04
  Net gains/(losses) on securities
    (both realized and unrealized)                       13.22          7.28          2.50         17.30          3.07          1.73
- ------------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                         13.14          7.24          2.62         17.30          3.12          1.77
- ------------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                    --            --            --         (.01)         (.01)         (.09)
  Distributions (from capital gains)                        --            --            --            --         (.28)         (.04)
- ------------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                         --            --            --         (.01)         (.29)         (.13)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                      $    33.00    $    19.86    $    12.62    $    38.56    $    21.27    $    18.44
- ------------------------------------------------------------------------------------------------------------------------------------
Total Return*                                           66.16%        57.37%        26.20%        81.32%        16.86%        10.53%
- ------------------------------------------------------------------------------------------------------------------------------------
Net Assets, End of Period (in thousands)            $   23,529    $       20    $       13    $   16,986    $       17    $       11
Average Net Assets for the Period (in thousands)    $    4,402    $       15    $       12    $    3,738    $       13    $       11
Ratio of Gross Expenses to Average Net Assets**(2)       1.19%         1.44%         1.73%         1.25%         1.35%         1.45%
Ratio of Net Expenses to Average Net Assets**(2)         1.19%         1.44%         1.73%         1.24%         1.35%         1.45%
Ratio of Net Investment Income/
  (Loss) to Average Net Assets**                         0.23%       (0.25)%         1.55%       (0.29)%         0.26%         0.26%
Portfolio Turnover Rate**                                  52%           91%          101%           80%           93%           86%
</TABLE>

*Total return not annualized for periods of less than one full year.
**Annualized for periods of less than one full year.
(1)  Period May 1, 1997, (inception) to December 31, 1997.
(2)  See footnote #5 in Notes to Financial Statements.

See Notes to Financial Statements.

                                      Janus Aspen Series / December 31, 1999  57
<PAGE>

Financial | Highlights - Retirement Shares (continued)

<TABLE>
<CAPTION>
                                                            Janus Aspen Worldwide                          Janus Aspen
For a share outstanding throughout                             Growth Portfolio                        Balanced Portfolio
each fiscal year or period ended December 31           1999          1998         1997(1)        1999          1998         1997(1)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                 <C>           <C>           <C>           <C>           <C>           <C>
Net Asset Value, Beginning of Period                $    29.06    $    23.36    $    20.72    $    22.59    $    17.47    $    15.38
- ------------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                           (.04)           .02           .14           .46           .21           .27
  Net gains/(losses) on securities
    (both realized and unrealized)                       18.54          6.57          2.80          5.41          5.58          2.30
- ------------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                         18.50          6.59          2.94          5.87          5.79          2.57
- ------------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                    --         (.02)         (.14)         (.42)         (.18)         (.30)
  Distributions (from capital gains)                        --         (.87)         (.16)            --         (.49)         (.18)
- ------------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                         --         (.89)         (.30)         (.42)         (.67)         (.48)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                      $    47.56    $    29.06    $    23.36    $    28.04    $    22.59    $    17.47
- ------------------------------------------------------------------------------------------------------------------------------------
Total Return*                                           63.66%        28.25%        14.22%        26.13%        33.59%        16.92%
- ------------------------------------------------------------------------------------------------------------------------------------
Net Assets, End of Period (in thousands)            $  174,399    $    5,837    $      403    $   53,598    $   17,262    $       12
Average Net Assets for the Period (in thousands)    $   49,424    $    1,742    $       11    $   28,498    $    3,650    $       11
Ratio of Gross Expenses to Average Net Assets**(2)       1.21%         1.22%         1.26%         1.19%         1.24%         1.32%
Ratio of Net Expenses to Average Net Assets**(2)         1.21%         1.22%         1.26%         1.19%         1.24%         1.32%
Ratio of Net Investment Income/
  (Loss) to Average Net Assets**                       (0.34)%       (0.02)%         0.16%         2.36%         2.04%         2.38%
Portfolio Turnover Rate**                                  67%           77%           80%           92%           70%          139%

<CAPTION>

                                                                    Janus Aspen Equity Income              Janus Aspen Growth and
For a share outstanding throughout                                          Portfolio                          Income Portfolio
each fiscal year or period ended December 31                    1999           1998          1997(1)         1999          1998(3)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                          <C>            <C>            <C>            <C>            <C>
Net Asset Value, Beginning of Period                         $    19.28     $    13.42     $    10.00     $    11.94     $    10.00
- ------------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                                      .03          (.05)            .01          (.01)            .01
  Net gains/(losses) on securities
    (both realized and unrealized)                                 7.85           6.12           3.41           8.75           1.93
- ------------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                                   7.88           6.07           3.42           8.74           1.94
- ------------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                             --             --             --             --             --
  Distributions (from capital gains)                              (.09)          (.21)             --             --             --
- ------------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                               (.09)          (.21)             --             --             --
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                               $    27.07     $    19.28     $    13.42     $    20.68     $    11.94
- ------------------------------------------------------------------------------------------------------------------------------------
Total Return*                                                    40.94%         45.55%         34.20%         73.20%         19.40%
- ------------------------------------------------------------------------------------------------------------------------------------
Net Assets, End of Period (in thousands)                     $      464     $       20     $       13     $    6,982     $       12
Average Net Assets for the Period (in thousands)             $      128     $       16     $       12     $    1,826     $       10
Ratio of Gross Expenses to Average Net Assets**(2)                1.78%          1.75%          1.74%          1.53%          1.72%
Ratio of Net Expenses to Average Net Assets**(2)                  1.77%          1.75%          1.74%          1.53%          1.72%
Ratio of Net Investment Income/(Loss) to Average Net Assets**   (0.04)%        (0.33)%          0.07%          0.11%          0.21%
Portfolio Turnover Rate**                                          114%            79%           128%            59%            62%
</TABLE>

*Total return not annualized for periods of less than one full year.
**Annualized for periods of less than one full year.
(1) Period May 1, 1997, (inception) to December 31, 1997.
(2) See footnote #5 in Notes to Financial Statements.
(3) Period May 1, 1998, (inception) to December 31, 1998.

See Notes to Financial Statements.

58  Janus Aspen Series / December 31, 1999
<PAGE>

<TABLE>
<CAPTION>
                                                          Janus Aspen Flexible Income                      Janus Aspen
For a share outstanding throughout                                Portfolio                           High-Yield Portfolio
each fiscal year or period ended December 31           1999          1998         1997(1)        1999          1998         1997(1)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                 <C>           <C>           <C>           <C>           <C>           <C>
Net Asset Value, Beginning of Period                $    12.05    $    11.77    $    11.41    $    10.84    $    11.78    $    11.19
- ------------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                             .37           .73           .50           .89           .87           .59
  Net gains/(losses) on securities
    (both realized and unrealized)                       (.27)           .27           .58         (.21)         (.77)           .71
- ------------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                           .10          1.00          1.08           .68           .10          1.30
- ------------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                 (.36)         (.61)         (.61)         (.85)         (.83)         (.65)
  Distributions (from capital gains)                     (.07)         (.11)         (.11)           --          (.21)         (.06)
- ------------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                      (.43)         (.72)         (.72)         (.85)        (1.04)         (.71)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                      $    11.72    $    12.05    $    11.77    $    10.67    $    10.84    $    11.78
- ------------------------------------------------------------------------------------------------------------------------------------
Total Return*                                            0.90%         8.58%         9.73%         6.35%         0.67%        11.96%
- ------------------------------------------------------------------------------------------------------------------------------------
Net Assets, End of Period (in thousands)            $      842    $       12    $       11    $       12    $       11    $       11
Average Net Assets for the Period (in thousands)    $      250    $       11    $       10    $       12    $       12    $       11
Ratio of Gross Expenses to Average Net Assets**(2)       1.20%         1.24%         1.23%         1.50%         1.50%         1.50%
Ratio of Net Expenses to Average Net Assets**(2)         1.20%         1.23%         1.23%         1.50%         1.50%         1.50%
Ratio of Net Investment Income to
  Average Net Assets**                                   6.80%         5.92%         6.39%         8.05%         7.33%         7.42%
Portfolio Turnover Rate**                                 116%          145%          119%          554%          301%          299%

<CAPTION>

                                                                        Janus Aspen Money
For a share outstanding throughout                                       Market Portfolio
each fiscal year or period ended December 31                    1999           1998          1997(1)
- -----------------------------------------------------------------------------------------------------
<S>                                                          <C>            <C>            <C>
Net Asset Value, Beginning of Period                         $     1.00     $     1.00     $     1.00
- -----------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                                      .04            .05            .03
  Net gains/(losses) on securities
    (both realized and unrealized)                                   --             --             --
- -----------------------------------------------------------------------------------------------------
Total from Investment Operations                                    .04            .05            .03
- -----------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                          (.04)          (.05)          (.03)
  Distributions (from capital gains)                                 --             --             --
- -----------------------------------------------------------------------------------------------------
Total Distributions                                               (.04)          (.05)          (.03)
- -----------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                               $     1.00     $     1.00     $     1.00
- -----------------------------------------------------------------------------------------------------
Total Return*                                                     4.45%          4.85%          3.13%
- -----------------------------------------------------------------------------------------------------
Net Assets, End of Period (in thousands)                     $    1,153     $       11     $       10
Average Net Assets for the Period (in thousands)             $      150     $       10     $       10
Ratio of Gross Expenses to Average Net Assets**(2)                0.86%          0.84%          1.00%
Ratio of Net Expenses to Average Net Assets**(2)                  0.86%          0.84%          1.00%
Ratio of Net Investment Income to Average Net Assets**            5.18%          4.74%          4.66%
</TABLE>

*Total return not annualized for periods of less than one full year.
**Annualized for periods of less than one full year.
(1)  Period May 1, 1997, (inception) to December 31, 1997.
(2)  See footnote #5 in Notes to Financial Statements.

                                       Janus Aspen Series / December 31, 1999 59
<PAGE>

Notes to | Schedules of Investments

ADR - American Depository Receipt
EUR - Euro
GBP - British Pound
GDR - Global Depository Receipt

*  Non-income-producing security

** A portion of this security has been segregated to cover margin or segregation
   requirements on open futures contracts and/or forward currency contracts.

+  Securities  are  registered  pursuant  to Rule  144A and may be  deemed to be
   restricted for resale.

Variable Rate Notes. The interest rate, which is based on specific,  or an index
of,  market  interest  rates,  is  subject  to  change.  Rates  in the  security
description are as of December 31, 1999.

Money market funds may hold  securities  with stated  maturities of greater than
397 days when those securities have features that allow a fund to "put" back the
security to the issuer or to a third party within 397 days of  acquisition.  The
maturity dates shown in the security descriptions are the stated maturity dates.

Repurchase  Agreements  held by a 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.

<TABLE>
<CAPTION>
                                         Purchases                       Sales                Realized      Dividend    Market Value
                                     Shares         Cost           Shares        Cost        Gain/(Loss)     Income     at 12/31/99
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen Worldwide Growth Portfolio
<S>                                <C>         <C>               <C>         <C>            <C>            <C>          <C>
British Telecommunications PLC     1,498,957   $ 25,502,610      1,498,957   $ 23,251,370   $ (2,251,240)          --             --
Vodafone AirTouch PLC(1)(2)          912,595      4,181,949      4,009,075     20,239,817     16,057,868   $   58,864   $  9,770,417
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
(1)  Name change from Vodafone  Group PLC to Vodafone  AirTouch  PLC,  effective
     6/30/99.
(2)  Adjusted for 5-for-1 stock split 10/4/99.

60  Janus Aspen Series / December 31, 1999
<PAGE>

                                                 Notes to | Financial Statements

The following  section  describes the  organization  and significant  accounting
policies of the  Portfolios  and provides  more detailed  information  about the
schedules and tables that appear throughout this report. In addition,  the Notes
explain  how the  Portfolios  operate  and the  methods  used in  preparing  and
presenting this report.

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. Eight 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 Balanced Portfolio, Janus
   Aspen Equity Income  Portfolio,  and Janus Aspen Growth and Income Portfolio.
   Two Portfolios invest primarily in income-producing  securities:  Janus Aspen
   Flexible Income Portfolio and Janus Aspen High-Yield  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 the Retirement  Shares.  Retirement Shares of the Trust are issued and
   redeemed only in connection with certain qualified retirement plans.

   Effective  December  31, 1999,  the Trust  issued a new class of shares,  the
   Service  Shares.  Janus Capital  invested  $10,000 of initial seed capital in
   each Portfolio of the Service Shares, which is not reflected in the financial
   statements.

   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.
   Income and gains and losses are allocated daily to each class of shares based
   upon the ratio of net assets  represented  by each class as a  percentage  of
   total net assets.

   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,  in possession  at the  Portfolio's  custodian,  which are
   denoted in the  accompanying  Schedule of  Investments.  The market  value of
   these  securities is evaluated daily to ensure that it is equal to or exceeds
   the current market value of the corresponding forward currency contract.

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

                                      Janus Aspen Series / December 31, 1999  61
<PAGE>

Notes to | Financial Statements (continued)

   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.

   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,  or that the  counterparty  will fail to perform  its
   obligations.

   INITIAL PUBLIC OFFERINGS
   The Portfolios may invest in initial public offerings (IPOs).  IPOs and other
   investment  techniques may have a magnified performance impact on a fund with
   a small asset base. The Portfolios may not experience similar  performance as
   its assets grow.

   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.

   Expenses are allocated  daily to each class of shares based upon the ratio of
   net assets  represented  by each class as a  percentage  of total net assets.
   Expenses  directly  attributable  to a specific  class of shares are  charged
   against the operations of such class.

   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 eight 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.  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,  Janus Aspen Equity Income
   Portfolio,  and Janus Aspen  Growth and Income  Portfolio  advisory  fees are
   reduced to the effective rates of Janus Fund,  Janus  Enterprise  Fund, Janus
   Twenty Fund,  Janus Overseas Fund, Janus Worldwide Fund, Janus Balanced Fund,
   Janus Equity Income Fund and Janus Growth and Income Fund, respectively.  The
   effective rate for each Portfolio for the period ended December 31, 1999, was
   .65%,  .66%,  .65%,  .65%,  .65%,  .66%,  .69%, and .65%,  respectively.  The
   Flexible  Income  Portfolio  is 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

62  Janus Aspen Series / December 31, 1999
<PAGE>

   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.  The  management  fee for  each  equity
   Portfolio  will  decrease  to an annual  rate of .65% of average  net assets,
   effective May 1, 2000. The management fee for the corresponding  Janus retail
   fund  corresponding to each equity Portfolio will also decrease to this rate,
   effective  January 31, 2000. Due to the fee reductions  described above, this
   will have the effect of lowering each equity  Portfolio's  management  fee on
   January 31, 2000 also.

   Janus  Capital  has agreed to reduce its fee to the extent  normal  operating
   expenses  exceed 1% of the  average  net  assets of the  Flexible  Income and
   High-Yield  Portfolios and .50% of the average net assets of the Money Market
   Portfolio for a fiscal year.

   Janus Capital has agreed to continue these fee waivers and  reductions  until
   at least the next annual renewal of the advisory  contracts.  The participant
   administration  fee and distribution fee applicable to the Retirement  Shares
   are not included in these expense limits.

   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 Service  Corporation  ("Janus  Service"),  a wholly owned subsidiary of
   Janus Capital,  receives  certain  out-of-pocket  expenses for transfer agent
   services. Janus Service also receives an administrative fee at an annual rate
   of up to .25% of the  average  daily net assets of the  Retirement  Shares of
   each Portfolio for providing or procurring  recordkeeping,  subaccounting and
   other  administrative  services  to  plan  participants  who  invest  in  the
   Retirement Shares.

   Janus  Distributors,  Inc., a wholly owned subsidiary of Janus Capital,  is a
   distributor  of  the  Portfolios.   The  Retirement  Shares  have  adopted  a
   Distribution  and  Shareholder  Servicing Plan (The "Plan")  pursuant to Rule
   12b-1 under The 1940 Act. The Plan  authorizes  payments by the Portfolios in
   connection with the  distribution of the Retirement  Shares at an annual rate
   as  determined  from time to time by the Board of Trustees,  of up to .25% of
   the Retirement Shares average daily net assets.

   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, 1999, are noted below:
                                                             Portfolio     DST
                                        DST Securities, Inc.  Expense    Systems
Portfolio                                Commissions Paid*   Reduction*   Costs
- --------------------------------------------------------------------------------
Janus Aspen Growth Portfolio                  $7,244           $5,433    $15,290
Janus Aspen Aggressive Growth Portfolio           --               --     19,912
Janus Aspen Capital Appreciation Portfolio        --               --     15,845
Janus Aspen International Growth Portfolio        --               --     19,106
Janus Aspen Worldwide Growth Portfolio            --               --     20,963
Janus Aspen Balanced Portfolio                 2,294            1,721     18,203
Janus Aspen Equity Income Portfolio               --               --     12,975
Janus Aspen Growth and Income Portfolio           55               41     12,831
Janus Aspen Flexible Income Portfolio             --               --     15,380
Janus Aspen High-Yield Portfolio                  --               --     13,271
Janus Aspen Money Market Portfolio                --               --     14,183
- --------------------------------------------------------------------------------
*The difference  between  commissions paid to DST Securities,  Inc. and expenses
reduced constituted commissions paid to an unaffiliated clearing broker.

                                      Janus Aspen Series / December 31, 1999  63
<PAGE>

Notes to | Financial Statements (continued)

3. FEDERAL INCOME TAX

   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, 1999, 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                      $   (11,765)        $    11,765               --
Janus Aspen Aggressive Growth Portfolio             7,527,228          (7,527,228)              --
Janus Aspen Capital Appreciation Portfolio                 --                  --               --
Janus Aspen International Growth Portfolio            (18,842)             29,025         $(10,183)
Janus Aspen Worldwide Growth Portfolio               (259,959)            258,285            1,674
Janus Aspen Balanced Portfolio                           (658)                658               --
Janus Aspen Equity Income Portfolio                        642               (619)             (23)
Janus Aspen Growth and Income Portfolio                   (12)                 12               --
Janus Aspen Flexible Income Portfolio                 (33,545)             33,545               --
Janus Aspen High-Yield Portfolio                           (5)                  5               --
Janus Aspen Money Market Portfolio                         --                  --               --
- --------------------------------------------------------------------------------------------------
</TABLE>

   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,  1999,  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,
   2006,  and December 31, 2007. In 1999,  the  Portfolios  noted below incurred
   "post-October"  losses during the period from November 1 through December 31,
   1999. These losses will be deferred for tax purposes and recognized in 2000.

   The  aggregate  cost  of  investments   and  the  composition  of  unrealized
   appreciation  and depreciation of investments for federal income tax purposes
   as of December 31, 1999, are also noted below.

<TABLE>
<CAPTION>
                                                 Post-October
                            Net Capital Loss  Capital   Currency    Federal Tax      Unrealized     Unrealized   Net Appreciation/
Portfolio                      Carryovers     Losses     Losses         Cost        Appreciation  (Depreciation)  (Depreciation)
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                           <C>           <C>         <C>        <C>             <C>             <C>            <C>
Janus Aspen Growth Portfolio           --          --   $    (60)  $2,100,890,465  $  943,897,578  $(39,915,672)  $   903,981,906
Janus Aspen Aggressive
  Growth Portfolio                     --          --     (1,984)   1,988,299,589   1,444,189,703   (58,621,505)    1,385,568,198
Janus Aspen Capital
  Appreciation Portfolio               --   $(873,431)        --      458,530,698     193,402,302    (3,233,626)      190,168,676
Janus Aspen International
  Growth Portfolio            $(6,761,112)         --         --      431,824,563     390,569,269    (2,585,993)      387,983,276
Janus Aspen Worldwide
  Growth Portfolio                     --          --     (8,857)   3,665,423,316   2,980,814,257   (36,095,696)    2,944,718,561
Janus Aspen
  Balanced Portfolio                   --          --     (7,055)   2,052,852,851     423,579,434   (44,119,544)      379,459,890
Janus Aspen Equity
  Income Portfolio                     --          --        (45)      13,987,700       5,380,028      (125,037)        5,254,991
Janus Aspen Growth
  and Income Portfolio                 --     (11,710)        --       68,769,859      24,424,222      (885,049)       23,539,173
Janus Aspen Flexible
  Income Portfolio             (2,276,738)         --    (30,342)     189,928,606       1,706,485    (5,544,612)       (3,838,127)
Janus Aspen High-Yield
  Portfolio                      (147,288)    (15,207)        --        1,624,276          20,862       (43,454)          (22,592)
Janus Aspen Money
  Market Portfolio                     --          --         --       71,436,869              --            --                --
- ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>

64  Janus Aspen Series / December 31, 1999
<PAGE>

   Janus  Aspen  International  Growth and Janus  Aspen  Worldwide  Growth  have
   elected to pass  through to  shareholders  foreign  taxes under  Section 853.
   Foreign taxes paid and foreign  source income for the  Portfolios  making the
   election are as folllows:

                                                      Foreign         Foreign
Portfolio                                            Taxes Paid    Source Income
- --------------------------------------------------------------------------------
Janus Aspen International Growth Portfolio           $  314,263      $  735,108
Janus Aspen Worldwide Growth Portfolio               $2,457,139      $4,934,026
- --------------------------------------------------------------------------------

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 gross  expense  ratios for the various  Portfolios  that
   would be in  effect,  absent  the  waiver of  certain  fees,  offsets  and/or
   voluntary  reduction  of  the  adviser's  fee to the  effective  rate  of the
   corresponding  Janus  retail  fund.  Expense  ratios are  annualized  for all
   periods less than one year.

<TABLE>
<CAPTION>
                                                            Institutional Shares                           Retirement Shares
Portfolio                                     1999     1998        1997        1996        1995        1999     1998        1997(2)
- ------------------------------------------------------------------------------------------------       --------------------------
<S>                                           <C>      <C>         <C>         <C>         <C>         <C>      <C>         <C>
Janus Aspen Growth Portfolio                  0.69%    0.75%       0.78%       0.83%       0.98%       1.19%    1.25%       1.28%
Janus Aspen Aggressive Growth Portfolio       0.70%    0.75%       0.78%       0.83%       0.93%       1.19%    1.26%       1.34%
Janus Aspen Capital Appreciation Portfolio    0.79%    0.97%       2.19%(2)     N/A         N/A        1.28%    1.49%       2.66%
Janus Aspen International Growth Portfolio    0.84%    0.95%       1.08%       2.21%       3.57%       1.32%    1.44%       1.57%
Janus Aspen Worldwide Growth Portfolio        0.71%    0.74%       0.81%       0.91%       1.09%       1.21%    1.24%       1.32%
Janus Aspen Balanced Portfolio                0.69%    0.74%       0.83%       1.07%       1.55%       1.19%    1.26%       1.33%
Janus Aspen Equity Income Portfolio           1.38%    1.86%       5.75%(2)     N/A         N/A        1.91%    2.36%       6.19%
Janus Aspen Growth and Income Portfolio       1.15%    3.06%(1)     N/A         N/A         N/A        1.62%    3.53%(1)     N/A
Janus Aspen Flexible Income Portfolio         0.72%    0.73%       0.75%       0.84%       1.07%       1.20%    1.24%       1.23%
Janus Aspen High-Yield Portfolio              4.92%    2.11%       3.27%       6.29%(3)     N/A        5.42%    2.61%       3.42%
Janus Aspen Money Market Portfolio            0.43%    0.34%       0.55%       0.78%       1.07%(4)    0.86%    0.84%       1.10%
- ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>

(1) Period May 1, 1998, (inception) to December 31, 1998.
(2) Period May 1, 1997, (inception) to December 31, 1997.
(3) Period May 1, 1996, (inception) to December 31, 1996.
(4) Period May 1, 1995, (inception) to December 31, 1995.

                                      Janus Aspen Series / December 31, 1999  65
<PAGE>

Explanations of | Charts, Tables and Financial Statements

1. PERFORMANCE OVERVIEWS

   Performance  overview graphs on the previous pages compare the performance of
   a  $10,000  investment  in  Institutional  Shares  of  each  Portfolio  (from
   inception)  to one or more widely used market  indexes  through  December 31,
   1999.

   When comparing the  performance  of a Portfolio  with an index,  keep in mind
   that  market  indexes  do not  include  brokerage  commissions  that would be
   incurred if you purchased the individual  securities in the index.  They also
   do not include taxes payable on dividends and interest or operating  expenses
   incurred if you maintained a Portfolio invested in the index.

   Average  annual  total  returns are also quoted for each class of  Portfolio.
   Average  annual total return is calculated by taking the growth or decline in
   value of an  investment  over a period  of time,  including  reinvestment  of
   dividends  and   distributions,   then  calculating  the  annual   compounded
   percentage  rate that would  have  produced  the same  result had the rate of
   growth been constant throughout the period.

2. SCHEDULES OF INVESTMENTS

   Following the performance  overview section is each  Portfolio's  Schedule of
   Investments.  This schedule reports the industry  concentrations and types of
   securities  held in each  Portfolio on the last day of the reporting  period.
   Securities are usually listed by type (common stock,  corporate  bonds,  U.S.
   government  obligations,  etc.)  and  by  industry  classification  (banking,
   communications, insurance, etc.).

   The  market  value  of each  security  is  quoted  as of the  last day of the
   reporting period.  The value of securities  denominated in foreign currencies
   is converted into U.S. dollars.

   Portfolios  that  invest in  foreign  securities  also  provide a summary  of
   investments  by country.  This summary  reports the  Portfolio's  exposure to
   different  countries by providing the  percentage  of securities  invested in
   each country.

2A. FORWARD CURRENCY CONTRACTS

   A table listing forward currency contracts follows each Portfolio's  Schedule
   of Investments (if applicable).  Forward currency contracts are agreements to
   deliver or receive a preset  amount of  currency  at a future  date.  Forward
   currency  contracts  are used to hedge against  foreign  currency risk in the
   Portfolio's long-term holdings.

   The table provides the name of the foreign  currency,  the settlement date of
   the contract,  the amount of the contract,  the value of the currency in U.S.
   dollars and the amount of unrealized  gain or loss.  The amount of unrealized
   gain or loss reflects the change in currency exchange rates from the time the
   contract was opened to the last day of the reporting period.

3. STATEMENT OF OPERATIONS

   This statement details the Portfolios' income,  expenses, gains and losses on
   securities and currency  transactions,  and  appreciation  or depreciation of
   current Portfolio holdings.

   The first section in this statement,  titled "Investment Income," reports the
   dividends  earned  from  stocks and  interest  earned  from  interest-bearing
   securities in the Portfolio.

   The next section  reports the expenses  and expense  offsets  incurred by the
   Portfolios,  including  the  advisory  fee  paid to the  investment  adviser,
   transfer agent fees, shareholder servicing expenses, and printing and postage
   for mailing statements, financial reports and prospectuses.

   The last section  lists the  increase or decrease in the value of  securities
   held in the  Portfolios.  Portfolios  realize a gain (or loss) when they sell
   their position in a particular security.  An unrealized gain (or loss) refers
   to the change in net  appreciation or  depreciation of the Portfolios  during
   the period.  "Net  Gain/(Loss) on Investments" is affected both by changes in
   the market  value of  Portfolio  holdings  and by gains (or losses)  realized
   during the reporting period.

66  Janus Aspen Series / December 31, 1999
<PAGE>

4. STATEMENT OF ASSETS AND LIABILITIES

   This  statement  is often  referred to as the  "balance  sheet." It lists the
   assets and  liabilities  of the  Portfolios  on the last day of the reporting
   period.

   The  Portfolios'  assets are calculated by adding the value of the securities
   owned, the receivable for securities sold but not yet settled, the receivable
   for  dividends  declared  but not  yet  received  on  stocks  owned,  and the
   receivable  for Portfolio  shares sold to investors but not yet settled.  The
   Portfolios' liabilities include payables for securities purchased but not yet
   settled,  Portfolio  shares  redeemed but not yet paid, and expenses owed but
   not yet paid. Additionally, there may be other assets and liabilities such as
   forward currency contracts.

   The last  section of this  statement  reports  the net asset  value (NAV) per
   share  on  the  last  day of the  reporting  period  for  each  class  of the
   Portfolio.  The NAV is  calculated  by dividing  the  Portfolios'  net assets
   (assets minus liabilities) by the number of shares outstanding.

5. STATEMENT OF CHANGES IN NET ASSETS

   This statement reports the increase or decrease in the Portfolios' net assets
   during  the  reporting  period.  Changes  in the  Portfolios'  net assets are
   attributable to investment operations,  dividends,  distributions and capital
   share  transactions.  This is important to investors because it shows exactly
   what caused the Portfolios' net asset size to change during the period.

   The first section summarizes the information from the Statement of Operations
   regarding   changes  in  net  assets  due  to  the   Portfolios'   investment
   performance.  The  Portfolios'  net  assets  may also  change  as a result of
   dividend and capital gains  distributions to investors.  If investors receive
   their  dividends  in cash,  money is taken  out of the  Portfolio  to pay the
   distribution.  If investors  reinvest their  dividends,  the  Portfolios' net
   assets will not be affected.  If you compare each  Portfolio's  "Net Decrease
   from  Dividends  and   Distributions"   to  the  "Reinvested   dividends  and
   distributions,"  you'll notice that dividend  distributions had little effect
   on each  Portfolio's  net  assets.  This is  because  all of Janus  investors
   reinvest their distributions.

   The reinvestment of dividends is included under "Capital Share Transactions."
   "Capital  Shares" refers to the money investors  contribute to the Portfolios
   through purchases or withdrawal via redemptions.  Each Portfolio's net assets
   will  increase and decrease in value as investors  purchase and redeem shares
   from a Portfolio.

   The section  entitled "Net Assets  Consist of" breaks down the  components of
   the Portfolios' net assets. Because Portfolios must distribute  substantially
   all  earnings,  you'll  notice  that a  significant  portion of net assets is
   shareholder capital.

                                      Janus Aspen Series / December 31, 1999  67
<PAGE>

Explanations of | Charts, Tables and Financial Statements (continued)

6. FINANCIAL HIGHLIGHTS

   This schedule  provides a per-share  breakdown of the components  that affect
   the net asset value (NAV) for  current  and past  reporting  periods for each
   class of the  Portfolio.  Not only does this  table  provide  you with  total
   return, it also reports total  distributions,  asset size, expense ratios and
   portfolio turnover rate.

   The first line in the table  reflects  the NAV per share at the  beginning of
   the reporting  period.  The next line reports the net  investment  income per
   share,  which  comprises  dividends and interest  income earned on securities
   held by the  Portfolios.  Following  is the  total  of  gains,  realized  and
   unrealized.  Dividends and distributions are then subtracted to arrive at the
   NAV per share at the end of the period.

   Also included are the expense  ratios,  or the  percentage of net assets that
   was used to cover operating  expenses during the period.  Expense ratios vary
   across the Portfolios for a number of reasons,  including the  differences in
   management fees, average  shareholder account size, the frequency of dividend
   payments  and  the  extent  of  foreign  investments,  which  entail  greater
   transaction costs.

   The   Portfolios'   expenses   may  be  reduced   through   expense-reduction
   arrangements.  These arrangements  include the use of brokerage  commissions,
   uninvested cash balances earning  interest or balance credits.  The Statement
   of Operations  reflects total expenses before any such offset,  the amount of
   offset and the net  expenses.  The  expense  ratios  listed in the  Financial
   Highlights  reflect total expenses both prior to any expense offset and after
   the offsets.

   The ratio of net  investment  income  summarizes the income earned divided by
   the average  net assets of a Portfolio  during the  reporting  period.  Don't
   confuse this ratio with a Portfolio's  yield. The net investment income ratio
   is not a true  measure of a  Portfolio's  yield  because it doesn't take into
   account the dividends distributed to the Portfolio's investors.

   The next ratio is the portfolio  turnover rate, which measures the buying and
   selling  activity in a  Portfolio.  Portfolio  turnover is affected by market
   conditions, changes in the size of a Portfolio, the nature of the Portfolio's
   investments and the investment  style of the portfolio  manager.  A 100% rate
   implies that an amount  equal to the value of the entire  Portfolio is turned
   over in a year;  a 50% rate means  that an amount  equal to the value of half
   the Portfolio is traded in a year; and a 200% rate means that an amount equal
   to the value of the Portfolio is sold every six months.

68  Janus Aspen Series / December 31, 1999
<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 Growth and Income Portfolio,  Janus Aspen Flexible Income Portfolio,
Janus  Aspen  High-Yield  Portfolio,  and Janus  Aspen  Money  Market  Portfolio
(constituting the Janus Aspen Series, hereafter referred to as the "Portfolios")
at December 31, 1999, the results of each of their  operations for the year then
ended, the changes in each of their net assets and the financial  highlights for
each  of  the  periods  indicated,  in  conformity  with  accounting  principles
generally  accepted  in  the  United  States.  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  auditing  standards
generally accepted in the United States,  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, 1999 by correspondence with the custodian and brokers,  provide a reasonable
basis for the opinion expressed above.

PricewaterhouseCoopers LLP

/s/ PricewaterhouseCoopers LLP

Denver, Colorado
February 2, 2000

                                      Janus Aspen Series / December 31, 1999  69
<PAGE>

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                              100 Fillmore Street
                              Denver, Colorado 80206-4923
                              1-800-504-4440

        Portfolios distributed by Janus Distributors, Inc. Member NASD.

This material must be preceded or  accompanied  by a prospectus,  which contains
more information including expenses. Read it carefully before you invest or send
money.

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