JANUS ASPEN SERIES
N-30D, 1998-08-26
Previous: EMPIRE STATE MUNICIPAL EXEMPT TRUST GUARANTEED SERIES 96, 24F-2NT, 1998-08-26
Next: FCB FINANCIAL CORP, S-8, 1998-08-26




                               Janus Aspen Series

                                      1998
                               Semiannual Report

                                                                   [LOGO]  JANUS
<PAGE>

         JANUS ASPEN GROWTH PORTFOLIO Portfolio Manager, James P. Craig

     For the six months  ended  June 30,  1998,  Janus  Aspen  Growth  Portfolio
returned  19.24% for the  Institutional  Shares  and  18.93% for the  Retirement
Shares.  This compares with the S&P 500 Index's  appreciation  of 17.72% for the
same period. All returns include reinvested dividends.  The average annual total
returns for the period ended June 30, 1998, follow on the next page.

     Our  impressive  gains  were due  largely  to a  repositioning  within  the
Portfolio  late  in  the  fourth  quarter.  This  was  followed  by  the  strong
first-quarter  performances  of a  number  of our  holdings  in the  technology,
pharmaceutical,  and cable sectors. I viewed the market's first-quarter rally as
evidence  that  concerns  about  Asia's  potential  downward  drag on  corporate
earnings had been  overpowered  by optimism  regarding  low  interest  rates and
inflation, actually helped by the Asian crisis.

Financial Troubles Building in Asia

     During the second quarter,  however, the downturn in Asia again took center
stage.  Concerns  regarding the Japanese  government's  failure to stimulate its
economy were  reflected in a significant  decline in the yen. This sparked fears
that  other  Southeast  Asian  currencies  may have to be  devalued.  Meanwhile,
volatility  in U.S.  stocks  increased as anxiety  over Asia's  impact on future
corporate earnings deepened.

     Although  companies  with  significant  exposure to Asia may indeed  suffer
future  earnings  disappointments,  I believe much of this fear has already been
reflected in revised earnings estimates. As for the Portfolio, I'm confident the
quality of our companies'  earnings  streams and their limited  exposure to Asia
will enable them to deliver the results we expect.

Technology, Drug, and Cable Stocks Excel

     I increased our position in the technology industry late last year when the
economic  downturn in Asia made it possible to buy high-quality  franchise names
at a discount.  America Online, Dell Computer,  Microsoft, and Cisco Systems all
posted strong  results and are companies I view as the leaders of  technological
change.  I wasn't as optimistic  about Intel,  which I sold at a loss. Intel was
forced to reduce the price of its microprocessor  chips to stay in sync with the
rising demand for sub-$1,000  personal  computers,  and, as a result, its profit
margin suffered.

     Our  positions  in  the   pharmaceutical   industry  were  also  standouts.
Warner-Lambert  and Pfizer  each  gained  close to 50% as the  strength of their
product pipelines enabled them to exceed  expectations.  However, we trimmed our
weighting in this industry in order to pursue more attractive  investment  ideas
and eliminated our Bristol-Myers Squibb, Cardinal Health, and SmithKline Beecham
positions, all at substantial profits.

     Several of our  pharmaceutical  stocks  also  benefited  from the  evolving
consolidation within the agriculture,  biotechnology,  and drug industries. This
movement  is driven by an  attempt  to pool  resources  to create  more  focused
research and development  budgets,  while leveraging  marketing to capitalize on
scientific breakthroughs.  For example, American Home Products' announced merger
with  Monsanto,  both of which were  holdings in the  Portfolio,  would form the
third-largest  drug/  agricultural/biotech  company in the world.  It would also
create a product  pipeline that includes  everything from arthritis  medicine to
soybeans. I am extremely positive about the long-term potential of this company.

     During  much of the  first  half,  our  cable  stocks  held  steady as they
consolidated  substantial  gains  from last  year.  However,  late in the second
quarter, the announced Tele-Communications,  Inc. acquisition by AT&T prompted a
quick but  significant  appreciation  among  cable  stocks.  Further  fueling my
enthusiasm  for this  industry  was the  successful  introduction  of  telephony
services  by  MediaOne  (formerly  U.S.  West  Media  Group),  Comcast,  and Cox
Communications.  This,  in addition to several  other new  value-added  services
these companies plan to offer through their existing operating platforms, should
enable them to generate tremendous additional cash flow.

     Two companies that did not perform to my  expectations  were Analog Devices
and Texas Instruments.  The semiconductor  industry has experienced  significant
volatility as a result of falling Asian currencies and overcapacity,  which have
forced down the price of  components.  Therefore,  in an effort to position  the
Portfolio  for the long  term,  I reduced  both of these  holdings  and added to
higher  value-added  semiconductor  companies such as Linear  Technology,  Maxim
Integrated Products, and Applied Materials.

- --------------------------------------------------------------------------------
Portfolio Asset Mix                     June 30, 1998     December 31, 1997
Equities                                    92.0%               91.3%
  Foreign                                    7.4%                9.4%
  Europe                                     5.2%                9.4%
Top 10 Equities                             33.0%               27.1%
Number of Stocks                              67                  80
Cash & Cash Equivalents                      8.0%                8.7%
- --------------------------------------------------------------------------------

Outlook for Stocks Still Positive

     Going forward,  our investment  team is sensitive to the  possibility  that
continued  deterioration in Asia could dampen the U.S. growth rate and that 1999
earnings  expectations  may be affected.  We continue to monitor this  situation
closely and remain  focused on companies we believe are capable of  successfully
managing Asian turbulence.  Overall,  we're generally  optimistic on the outlook
for the market due to the fact that we expect  interest  rates and  inflation to
stay at their  current low levels and economic  growth to remain  strong,  which
should provide a continued positive environment for equities.

     We appreciate your investment in Janus Aspen Growth Portfolio.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   1
<PAGE>

         JANUS ASPEN GROWTH PORTFOLIO Portfolio Manager, James P. Craig

- --------------------------------------------------------------------------------
Average Annual Total Return(1)
For the Periods Ended June 30, 1998
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 9/13/93)
  1 Year                                          29.21%
  From Inception                                  20.05%
- --------------------------------------------------------------------------------
S&P 500 Index
  1 Year                                          30.17%
  From Inception Date of Institutional Shares     23.42%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                          28.47%
  From Inception                                  32.95%
- --------------------------------------------------------------------------------

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

             JANUS ASPEN GROWTH PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Common Stock - 92.0%
- --------------------------------------------------------------------------------
Advertising Sales - 0.1%
        31,030   Outdoor Systems, Inc.*                            $     868,840
- --------------------------------------------------------------------------------
Agricultural Biotechnology - 2.5%
       379,025   Monsanto Co.                                         21,178,022
- --------------------------------------------------------------------------------
Automotive - Truck Parts and Equipment - 2.1%
       253,275   Federal-Mogul Corp.                                  17,096,062
- --------------------------------------------------------------------------------
Cable Television - 9.8%
       686,325   Comcast Corp. - Special Class A                      27,860,505
       159,070   Cox Communications, Inc. - Class A*                   7,704,953
       551,375   MediaOne Group, Inc.*                                24,226,039
       554,245   Tele-Communications, Inc. - Class A*                 21,303,792
- --------------------------------------------------------------------------------
                                                                      81,095,289
- --------------------------------------------------------------------------------
Chemicals - Diversified - 4.2%
       310,080   E.I. du Pont de Nemours and Co.                      23,139,720
       100,000   Imperial Chemical Industries PLC (ADR)                6,450,000
       178,210   Solutia, Inc.                                         5,112,399
- --------------------------------------------------------------------------------
                                                                      34,702,119
- --------------------------------------------------------------------------------
Chemicals - Specialty - 0.6%
       104,825   Cytec Industries, Inc.*                               4,638,506
- --------------------------------------------------------------------------------
Circuits - 1.9%
        10,775   Analog Devices, Inc.*                                   264,661
       250,700   Linear Technology Corp.                              15,120,344
- --------------------------------------------------------------------------------
                                                                      15,385,005
- --------------------------------------------------------------------------------
Commercial Banks - 2.0%
         9,475   M & T Bank Corp.                                      5,249,150
       107,805   Northern Trust Corp.                                  8,220,131
        54,550   Star Banc Corp.                                       3,484,381
- --------------------------------------------------------------------------------
                                                                      16,953,662
- --------------------------------------------------------------------------------
Commercial Services - 1.6%
       382,055   Gartner Group, Inc. - Class A*                       13,371,925
- --------------------------------------------------------------------------------
Computer Software - 10.5%
       522,050   Cadence Design Systems, Inc.*                        16,314,063
       396,850   Microsoft Corp.*                                     43,008,619
       782,405   Parametric Technology Co.*                           21,222,736
       170,000   Wind River Systems*                                   6,098,750
- --------------------------------------------------------------------------------
                                                                      86,644,168
- --------------------------------------------------------------------------------
Computers - Micro - 1.2%
       106,570   Dell Computer Corp.*                              $   9,891,028
- --------------------------------------------------------------------------------
Cruise Lines - 1.3%
       154,050   Carnival Corp. - Class A                              6,104,231
        60,375   Royal Caribbean Cruises, Ltd.                         4,799,813
- --------------------------------------------------------------------------------
                                                                      10,904,044
- --------------------------------------------------------------------------------
Diversified Financial Services - 1.1%
       119,425   Associates First Capital Corp. - Class A              9,180,797
- --------------------------------------------------------------------------------
Diversified Operations - 6.9%
       623,550   CBS Corp.*                                           19,797,713
       111,100   General Electric Co.                                 10,110,100
       283,890   Siebe PLC**                                           5,669,835
       345,650   Tyco International, Ltd.                             21,775,950
- --------------------------------------------------------------------------------
                                                                      57,353,598
- --------------------------------------------------------------------------------
Drug Delivery Systems - 0.5%
       100,000   ALZA Corp.*                                           4,325,000
- --------------------------------------------------------------------------------
Electronic Components - Semiconductors - 3.7%
       290,830   Applied Materials, Inc.*                              8,579,485
       466,700   Maxim Integrated Products, Inc.*                     14,788,556
       119,950   Texas Instruments, Inc.                               6,994,584
- --------------------------------------------------------------------------------
                                                                      30,362,625
- --------------------------------------------------------------------------------
Electronic Safety Devices - 0.6%
        70,675   Pittway Corp. - Class A                               5,221,116
- --------------------------------------------------------------------------------
Finance - Consumer Loans - 1.8%
       293,745   Household International, Inc.                        14,613,814
- --------------------------------------------------------------------------------
Finance - Investment Bankers/Brokers - 3.2%
       337,537   Charles Schwab Corp.                                 10,969,953
       171,485   Morgan Stanley, Dean Witter, Discover and Co.        15,669,442
- --------------------------------------------------------------------------------
                                                                      26,639,395
- --------------------------------------------------------------------------------
Finance - Other Services - 2.2%
       200,000   Newcourt Credit Group, Inc.                           9,547,500
       174,709   Newcourt Credit Group, Inc. - New York Shares         8,593,499
- --------------------------------------------------------------------------------
                                                                      18,140,999
- --------------------------------------------------------------------------------
Food - Wholesale - 0.4%
        98,725   U.S. Foodservice, Inc.*                               3,461,545
- --------------------------------------------------------------------------------
Human Resources - 1.0%
       146,950   Robert Half International, Inc.*                      8,210,831
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   2
<PAGE>

             JANUS ASPEN GROWTH PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Instruments - Scientific - 0.9%
       268,450   Dionex Corp.*                                     $   7,080,369
- --------------------------------------------------------------------------------
Internet Software - 1.2%
        90,200   America Online, Inc.*                                 9,561,200
- --------------------------------------------------------------------------------
Life and Health Insurance - 0.4%
         4,250   Schweizerische Lebensversicherungs-und
                  Rentenanstalt*                                       3,597,680
- --------------------------------------------------------------------------------
Medical - Drugs - 6.0%
       116,665   American Home Products Corp.                          6,037,414
        10,310   Eli Lilly and Co.                                       681,104
       150,150   Pfizer, Inc.                                         16,319,428
        67,175   Schering-Plough Corp.                                 6,154,909
       294,600   Warner-Lambert Co.                                   20,437,875
- --------------------------------------------------------------------------------
                                                                      49,630,730
- --------------------------------------------------------------------------------
Medical Instruments - 0%
         7,690   U.S. Surgical Corp.                                     350,856
- --------------------------------------------------------------------------------
Money Center Banks - 5.2%
       333,525   Bank of New York Co., Inc.                           20,240,798
       112,700   BankAmerica Corp.                                     9,741,506
        30,415   Citicorp                                              4,539,439
        65,026   Lloyds TSB Group PLC**                                  912,993
        21,410   UBS A.G.                                              7,960,939
- --------------------------------------------------------------------------------
                                                                      43,395,675
- --------------------------------------------------------------------------------
Multimedia - 4.9%
       263,860   Meredith Corp.                                       12,384,929
       327,238   Time Warner, Inc.                                    27,958,397
- --------------------------------------------------------------------------------
                                                                      40,343,326
- --------------------------------------------------------------------------------
Networking Products - 5.0%
       453,225   Cisco Systems, Inc.*                                 41,725,027
- --------------------------------------------------------------------------------
Pharmacy Services - 1.1%
       229,890   Omnicare, Inc.                                        8,764,556
- --------------------------------------------------------------------------------
Publishing - Books - 2.2%
       134,813   Wolters Kluwer N.V.**                                18,503,285
- --------------------------------------------------------------------------------
Radio - 1.2%
       200,000   Chancellor Media Corp.*                               9,931,250
- --------------------------------------------------------------------------------
Retail - Discount - 1.3%
       169,625   Costco Companies, Inc.*                              10,696,977
- --------------------------------------------------------------------------------
Retail - Regional Department Stores - 0.2%
        39,875   Fred Meyer, Inc.*                                     1,694,687
- --------------------------------------------------------------------------------
Telecommunication Services - 0.2%
       100,000   Hyperion Telecommunications, Inc. - Class A*          1,568,750
- --------------------------------------------------------------------------------
Telephone - Long Distance - 2.0%
       200,000   AT&T Corp.                                           11,425,000
       112,860   WorldCom, Inc.*                                       5,466,656
- --------------------------------------------------------------------------------
                                                                      16,891,656
- --------------------------------------------------------------------------------
Television - 1.0%
       226,450   Univision Communications, Inc. - Class A*             8,435,263
- --------------------------------------------------------------------------------
Total Common Stock (cost $581,819,449)                               762,409,677
- --------------------------------------------------------------------------------
U.S. Government Agencies - 8.9%
                 Fannie Mae
  $ 30,000,000      5.41%, 8/7/98                                     29,833,192
                 Freddie Mac:
    19,200,000      5.85%, 7/1/98                                     19,200,000
    25,000,000      5.44%, 7/10/98                                    24,966,000
- --------------------------------------------------------------------------------
Total U.S. Government Agencies (amortized cost $73,999,192)           73,999,192
- --------------------------------------------------------------------------------
Total Investments (total cost $655,818,641) - 100.9%                 836,408,869
- --------------------------------------------------------------------------------
Liabilities, net of Cash, Receivables and Other Assets - (0.9%)      (7,701,326)
- --------------------------------------------------------------------------------
Net Assets - 100%                                                  $ 828,707,543
- --------------------------------------------------------------------------------

                       Summary of Investments by Country
                                 June 30, 1998

Country                     % of Investment Securities             Market Value
- --------------------------------------------------------------------------------
Canada                                   2.2%                     $   18,140,999
Netherlands                              2.2%                         18,503,285
Switzerland                              1.4%                         11,558,618
United Kingdom                           1.6%                         13,032,828
United States++                         92.6%                        775,173,139
- --------------------------------------------------------------------------------
Total                                  100.0%                     $  836,408,869
================================================================================
++Includes Short-Term Securities (83.8% excluding Short-Term Securities)


                           Forward Currency Contracts
                             Open at June 30, 1998

Currency Sold and                Currency           Currency         Unrealized
Settlement Date                 Units Sold        Value in $ U.S.    Gain/(Loss)
- --------------------------------------------------------------------------------
British Pound 9/16/98             5,900,000         $ 9,791,050       ($45,530)
Dutch Guilder 7/23/98            13,000,000           6,387,892          27,267
- --------------------------------------------------------------------------------
Total                                               $16,178,942       ($18,263)
================================================================================

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   3
<PAGE>

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

     I'm  pleased  to  report  that  Janus  Aspen  Aggressive  Growth  Portfolio
continued to gain momentum during the six-month  period ended June 30, 1998. The
Portfolio  returned  17.27%  for the  Institutional  Shares  and  16.98% for the
Retirement  Shares,  compared with the S&P MidCap 400 Index, which gained 8.63%.
All returns include reinvested  dividends.  The average annual total returns for
the period ended June 30, 1998, follow on the next page.

     The Portfolio's turnaround,  which began late in 1997 and continued through
the first and second  quarters of '98,  was the result of  remaining  true to my
investment  discipline.  I continued to focus on midsize companies with dominant
market presence and prospects for rapid growth. As the market began to recognize
the true value of many of our companies, the Portfolio steadily gained ground.

     Despite our strong performance,  investors continued to favor the liquidity
of big, brand-name  companies,  causing large cap stocks to again outperform the
broad  mid  cap  universe.  But as  financial  difficulties  in  Asia  lingered,
corporate  earnings  for many  larger,  multinational  companies  began to slow.
However,  I focus on companies that are relatively  insulated from macroeconomic
events and believe  the market  will  continue to realize the value of our small
and mid cap companies.

- --------------------------------------------------------------------------------
Portfolio Asset Mix                     June 30, 1998     December 31, 1997
Equities                                    97.6%               97.0%
  Foreign                                   10.9%               13.6%
Number of Stocks                              57                  68
Top 10 Equities                             41.4%               41.5%
Cash & Cash Equivalents                      2.4%                3.0%
- --------------------------------------------------------------------------------

Increased Focus on Technology, Drug Stocks

     The only major change to the  Portfolio  was an increase in our  technology
weighting,  which remains  underweighted  relative to its benchmark.  I began to
selectively  build these positions  during the sell-off late in 1997 and further
increased  them when  technology  stocks  dropped again in the second quarter of
'98. My strategy was to uncover  companies  that have low risk relative to their
growth rate.  This paid off in the form of stellar  results from America Online,
Vitesse Semiconductor, and Cadence Design Systems.

     An enhanced research effort allowed us to increase our focus on the mid cap
pharmaceutical  sector. As a result, we uncovered some new names, including ALZA
Corporation, Medimmune, Inc., and Watson Pharmaceuticals.  The product pipelines
of all three show signs of  promise;  therefore,  I look for these  stocks to be
solid long-term performers.

Education Evolves as a Theme

     A new  name and  strong  performer  in the  Portfolio  was ITT  Educational
Services,  which  offers  technology-oriented  post-secondary  degree  programs.
Another solid stock, and a position I significantly increased, was Apollo Group.
This company provides accredited degree programs through its subsidiaries, which
include the University of Phoenix.

     Aside from Apollo's  strong gains, my optimism for the stock comes from the
increasing  demand for graduate  degrees among working  adults and the fact that
Apollo is uniquely  focused on  catering  to this  audience.  In  addition,  the
company is not burdened with many of the costs typically  associated with higher
education. It leases its office space, has a revenue-generating  online library,
and employs a part-time  teaching  staff,  which  relieves it of retirement  and
insurance  plan expenses.  Furthermore,  students are required to pay tuition in
advance, generating significant free cash flow for the business. Both Apollo and
ITT are benefiting from a rise in compensation for college graduates versus high
school  graduates,  essentially  giving their  students a higher return on their
invested tuition dollar.

     Also among the  Portfolio's  top  performers was  PizzaExpress,  a UK-based
holding.  This company has  consistently  produced  industry-leading  same-store
sales growth and profit margins. Further boosting the stock was the introduction
of PizzaExpress  restaurants into Continental  Europe and the launch of a second
concept, Pasta Milano, in the UK. These initiatives have met with early success,
and I anticipate positive results going forward.

     Although the overall  performance  of the Portfolio was strong,  there were
some stocks that  underperformed.  Our media stocks encountered a bad stretch in
April and May before  bouncing  back late in the second  quarter.  Clear Channel
Communications,  a U.S.  broadcasting  and  billboard  company,  suffered from a
bidding  war (which it won) to acquire  Moore  Group,  a  British-based  outdoor
advertising  company.   Chancellor  Media,  a  radio  broadcasting  corporation,
experienced turbulence as a result of internal conflicts that included the hasty
departure  of its  CEO.  And  Heftel  Broadcasting,  a  Spanish  language  radio
broadcasting  company,  weakened from concerns regarding the potential emergence
of a new competitor.  I remain optimistic about the long-term  prospects for all
of these companies and continue to hold our positions.

Future of Small and Mid Caps Looks Good

     It's noteworthy that we are seeing a slowdown in the corporate  earnings of
large cap  companies,  even though the economy  continues  to expand at a robust
pace.  This may be a sign of a profound shift in trends.  I believe the downturn
in Asia will continue to rein in larger companies' earnings growth. However, our
discipline of focusing on all-weather companies has not only produced some solid
results for the first half, but our returns have picked up  dramatically  during
the past  year - despite a less than  favorable  backdrop  in small and  midsize
stocks.  Therefore,  I remain  confident  that our companies can continue to log
solid results.

     In  closing,  I'd like to  thank  you for your  investment  in Janus  Aspen
Aggressive Growth Portfolio.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   4
<PAGE>

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

- --------------------------------------------------------------------------------
Average Annual Total Return(1)
For the Periods Ended June 30, 1998
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 9/13/93)
  1 Year                                          28.74%
  From Inception                                  21.04%
- --------------------------------------------------------------------------------
S&P MidCap 400 Index
  1 Year                                          27.10%
  From Inception Date of Institutional Shares     18.01%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                          28.11%
  From Inception                                  40.50%
- --------------------------------------------------------------------------------

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


       JANUS ASPEN AGGRESSIVE GROWTH PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Common Stock - 97.6%
- --------------------------------------------------------------------------------
Advertising Sales - 3.2%
        98,995   HA-LO Industries, Inc.*                           $   3,081,219
       611,239   Outdoor Systems, Inc.*                               17,114,692
- --------------------------------------------------------------------------------
                                                                      20,195,911
- --------------------------------------------------------------------------------
Advertising Services - 0.3%
        44,955   Snyder Communications, Inc.*                          1,978,020
- --------------------------------------------------------------------------------
Airlines - 1.1%
       199,623   Ryanair Holdings PLC (ADR)*                           7,111,569
- --------------------------------------------------------------------------------
Cable Television - 2.2%
       166,780   Comcast Corp. - Special Class A                       6,770,226
       158,960   MediaOne Group, Inc.*                                 6,984,305
- --------------------------------------------------------------------------------
                                                                      13,754,531
- --------------------------------------------------------------------------------
Cellular Telecommunications - 0.9%
       294,100   Western Wireless Corp. - Class A                      5,863,619
- --------------------------------------------------------------------------------
Circuits - 5.1%
       264,625   SIPEX Corp.*                                          5,689,438
       849,855   Vitesse Semiconductor Corp.*                         26,239,273
- --------------------------------------------------------------------------------
                                                                      31,928,711
- --------------------------------------------------------------------------------
Commercial Banks - 5.6%
        11,565   M & T Bank Corp.                                      6,407,010
       124,235   Northern Trust Corp.                                  9,472,919
       247,615   Star Banc Corp.                                      15,816,408
        45,835   U.S. Trust Corp.                                      3,494,919
- --------------------------------------------------------------------------------
                                                                      35,191,256
- --------------------------------------------------------------------------------
Commercial Services - 6.1%
        55,400   Gartner Group, Inc. - Class A*                        1,939,000
       184,766   HealthCare Financial Partners, Inc.*                 11,328,465
       608,853   Paychex, Inc.                                        24,772,706
- --------------------------------------------------------------------------------
                                                                      38,040,171
- --------------------------------------------------------------------------------
Computer Software - 3.5%
       564,533   Cadence Design Systems, Inc.*                        17,641,656
       160,240   Parametric Technology Co.*                            4,346,510
- --------------------------------------------------------------------------------
                                                                      21,988,166
- --------------------------------------------------------------------------------
Cruise Lines - 1.3%
        99,100   Royal Caribbean Cruises, Ltd.                         7,878,450
- --------------------------------------------------------------------------------
Diversified Financial Services - 0.5%
       132,310   American Capital Strategies, Ltd.                 $   3,026,591
- --------------------------------------------------------------------------------
Diversified Operations - 0.5%
       246,130   Metromedia International Group, Inc.*                 2,938,177
- --------------------------------------------------------------------------------
Drug Delivery Systems - 0.9%
       127,375   ALZA Corp.*                                           5,508,969
- --------------------------------------------------------------------------------
Electric - Generation - 1.9%
       229,190   AES Corp.*                                           12,046,799
- --------------------------------------------------------------------------------
Electronic Components - Semiconductors - 1.3%
       251,755   Maxim Integrated Products, Inc.*                      7,977,487
- --------------------------------------------------------------------------------
Finance - Consumer Loans - 1.0%
       228,550   Medallion Financial Corp.                             6,285,125
- --------------------------------------------------------------------------------
Finance - Credit Card - 0.7%
        32,100   Capital One Financial Corp.                           3,986,419
- --------------------------------------------------------------------------------
Finance - Investment Bankers/Brokers - 1.0%
       192,460   Charles Schwab Corp.                                  6,254,950
- --------------------------------------------------------------------------------
Finance - Mortgage Loan Banker - 0.6%
       352,375   Capital Trust - Class A*                              3,391,609
- --------------------------------------------------------------------------------
Finance - Other Services - 0.5%
        64,835   Newcourt Credit Group, Inc. - New York Shares         3,189,072
- --------------------------------------------------------------------------------
Golf - 0.5%
       113,887   Family Golf Centers, Inc.*                            2,882,765
- --------------------------------------------------------------------------------
Human Resources - 2.2%
     1,211,682   Capita Group PLC**                                   10,421,819
        54,445   Robert Half International, Inc.*                      3,042,114
- --------------------------------------------------------------------------------
                                                                      13,463,933
- --------------------------------------------------------------------------------
Internet Content - 0.5%
        65,015   At Home Corp. - Class A*                              3,076,022
- --------------------------------------------------------------------------------
Internet Software - 3.0%
       175,285   America Online, Inc.*                                18,580,210
- --------------------------------------------------------------------------------
Medical - Biomedical and Genetic - 0.4%
        66,095   Incyte Pharmaceuticals, Inc.*                         2,255,492
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   5
<PAGE>

       JANUS ASPEN AGGRESSIVE GROWTH PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Medical - Drugs - 2.4%
       219,105   MedImmune, Inc.*                                  $  13,666,674
        33,410   Sepracor, Inc.*                                       1,386,515
- --------------------------------------------------------------------------------
                                                                      15,053,189
- --------------------------------------------------------------------------------
Medical - Generic Drugs - 1.0%
       127,470   Watson Pharmaceuticals, Inc.*                         5,951,256
- --------------------------------------------------------------------------------
Medical Instruments - 3.9%
        50,375   Cyberonics, Inc.                                        535,234
       274,115   Sofamor Danek Group, Inc.*                           23,728,080
- --------------------------------------------------------------------------------
                                                                      24,263,314
- --------------------------------------------------------------------------------
Music/Clubs - 1.8%
       249,858   SFX Entertainment, Inc. - Class A*                   11,462,236
- --------------------------------------------------------------------------------
Pharmacy Services - 4.6%
       746,155   Omnicare, Inc.                                       28,447,159
- --------------------------------------------------------------------------------
Property and Casualty Insurance - 3.7%
       165,520   Progressive Corp.                                    23,338,320
- --------------------------------------------------------------------------------
Radio - 13.4%
       435,725   Capstar Broadcasting Corp. - Class A                 10,947,591
       487,675   Chancellor Media Corp.*                              24,216,112
       115,265   Clear Channel Communications, Inc.*                  12,578,293
       598,300   Heftel Broadcasting Corp. - Class A*                 26,773,925
       156,890   Jacor Communications, Inc.*                           9,256,510
- --------------------------------------------------------------------------------
                                                                      83,772,431
- --------------------------------------------------------------------------------
Resorts and Theme Parks - 1.7%
       159,575   Premier Parks, Inc.*                                 10,631,684
- --------------------------------------------------------------------------------
Retail - Building Products - 1.0%
       127,782   Fastenal Co.                                          5,933,877
- --------------------------------------------------------------------------------
Retail - Catalog Shopping - 1.2%
       260,832   MSC Industrial Direct Co., Inc. - Class A*            7,433,712
- --------------------------------------------------------------------------------
Retail - Drug Store - 0.4%
        70,495   CVS Corp.                                             2,744,899
- --------------------------------------------------------------------------------
Retail - Pubs - 3.4%
     4,463,748   J.D. Wetherspoon PLC**                               21,486,802
- --------------------------------------------------------------------------------
Retail - Restaurants - 4.1%
     1,807,589   PizzaExpress PLC**                                   25,756,318
- --------------------------------------------------------------------------------
Schools - 7.9%
     1,026,156   Apollo Group, Inc. - Class A*                        33,927,283
       485,565   ITT Educational Services, Inc.*                      15,659,471
- --------------------------------------------------------------------------------
                                                                      49,586,754
- --------------------------------------------------------------------------------
Television - 2.3%
       389,873   Univision Communications, Inc. - Class A*            14,522,769
- -------------------------------------------------------------------------------
Total Common Stock (cost $445,990,980)                               609,178,744
- --------------------------------------------------------------------------------
U.S. Government Agencies - 4.3%
                 Fannie Mae
  $ 15,000,000      5.41%, 8/7/98                                     14,916,596
                 Freddie Mac
    12,200,000      5.85%, 7/1/98                                     12,200,000
- --------------------------------------------------------------------------------
Total U.S. Government Agencies (amortized cost $27,116,596)           27,116,596
- --------------------------------------------------------------------------------
Total Investments (total cost $473,107,576) - 101.9%                 636,295,340
- --------------------------------------------------------------------------------
Liabilities, net of Cash, Receivables and Other Assets - (1.9%)     (11,846,200)
- --------------------------------------------------------------------------------
Net Assets - 100%                                                  $ 624,449,140
- --------------------------------------------------------------------------------


                       Summary of Investments by Country
                                 June 30, 1998

Country                     % of Investment Securities             Market Value
- --------------------------------------------------------------------------------
Canada                                   0.5%                     $    3,189,072
Ireland                                  1.1%                          7,111,569
United Kingdom                           9.1%                         57,664,939
United States++                         89.3%                        568,329,760
- --------------------------------------------------------------------------------
Total                                  100.0%                     $  636,295,340
================================================================================
++Includes Short-Term Securities (85.1% excluding Short-Term Securities)


                           Forward Currency Contracts
                             Open at June 30, 1998

Currency Sold and                Currency           Currency         Unrealized
Settlement Date                 Units Sold        Value in $ U.S.    Gain/(Loss)
- --------------------------------------------------------------------------------
British Pound 7/10/98             5,208,000         $ 8,677,049      ($216,335)
British Pound 8/13/98             1,015,000           1,687,640        (47,401)
British Pound 8/14/98             2,800,000           4,655,560        (82,040)
British Pound 10/7/98             9,600,000          15,912,000           4,800
British Pound 11/4/98             5,500,000           9,101,400        (64,900)
- --------------------------------------------------------------------------------
Total                                               $40,033,649      ($405,876)
================================================================================

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   6
<PAGE>

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

     Janus Aspen Capital  Appreciation  Portfolio  returned an impressive 31.08%
for its Institutional Shares and 30.82% for its Retirement Shares during the six
months ended June 30, 1998. In comparison,  the S&P 500 Index gained 17.72%. All
returns include reinvested  dividends.  The average annual total returns for the
period ended June 30, 1998, follow on the next page.

     Low interest rates and benign  inflation  provided a positive  backdrop for
the  Portfolio,  particularly  during  the first  three  months  of the  period.
However,  in the second  quarter,  volatility  increased  as  renewed  financial
turmoil in Asia and  perceptions  of the  Federal  Reserve  Board's  bias toward
raising interest rates came into play.  Nonetheless,  the solid  fundamentals on
which I base my investment  selections,  including  strong  management,  product
development,  and expanding market share, helped our stocks prevail.  With these
fundamentals  intact and  barring  any sudden  change in the  interest  rate and
inflationary environments,  I believe these companies should continue to prosper
despite market volatility.

Barbell Strategy Adds Balance

     The Portfolio's  "barbell"  strategy continued to work well.  Typically,  I
start with larger companies that have  demonstrated  more predictable  earnings,
mature management,  and distribution systems, such as Microsoft,  Gillette,  and
Pfizer. Then I balance these ideas by selectively adding emerging growth leaders
- - smaller, more aggressive companies in the earlier stages of development - like
At Home, a network management  company and cable Internet service provider,  and
Chancellor  Media,  a growing media and radio  conglomerate.  But no matter what
their  size,  all  of  the   Portfolio's   companies   share  several   distinct
characteristics:  dynamic growth prospects,  uniquely  positioned product lines,
and competitive positions in their industries.

Top Performers in Sync With Trends

     Our substantial weightings in the pharmaceutical, financial, and technology
sectors  - areas I  believe  offer  the  most  dynamic  prospects  for  growth -
continued to drive the Portfolio's  performance.  The reason for this is simple:
These  industries'  products  and  services  stand to benefit  from  broad-based
demographic  and  economic  trends  in  the  U.S.  and  abroad.  Currently,  the
pharmaceutical  industry  epitomizes the strength of these trends.  By embracing
new technology,  a much-expanded  product  pipeline is effectively  created that
will  treat a host of  ailments.  Combine  this  with an  aging  population  and
burgeoning  acceptance of drug  therapies,  and many  industry  leaders are well
positioned  to increase  revenue and gain further  market  share.  Capturing the
limelight  during  the  first  half were  Warner-Lambert  and  Pfizer  for their
successful  introduction of new products,  which helped the companies post gains
of more than 45%.

     Among our  strongest-performing  financial  stocks was  BankAmerica,  which
recently  announced  its plans to merge with  NationsBank,  creating  the second
largest  banking  franchise in the U.S. A visit with  BankAmerica's  CEO shortly
after the  announcement  fueled my optimism  about this union and confirmed that
both of these companies are very much in line with where I believe the future of
banking is heading - toward  electronic  and online  banking.  I also feel their
demographic and geographic  footprints  complement each other. For example,  the
offices of the combined banks will extend  virtually  coast to coast,  and their
services  will meet the  needs of a larger  client  base,  from  individuals  to
businesses large and small.

     Despite some  weakness in the  technology  sector  caused  primarily by the
reemergence of Asian concerns and several  negative  earnings  preannouncements,
our technology holdings held up very well and even rallied toward the end of the
period.  Recording  significant gains were Microsoft,  America Online,  and Dell
Computer.

     In  regard  to   Microsoft   specifically,   we  continue  to  monitor  the
government's   antitrust  suit  against  the  software  giant.  A  meeting  with
Microsoft's  attorneys to discuss  their view of the  situation  left us feeling
confident the company has a strong case based on legal precedent. Our confidence
was further  boosted upon a U.S.  Appeals Court's recent decision to support the
company's  integration  of its  Internet  browser on its  Windows  95  operating
system.

     Market  volatility  caused  many  investors  to turn  toward  the safety of
larger,  more  established  companies,  resulting  in a downturn for some of our
small, high P/E stocks. CBT Group, a company that provides interactive education
software for businesses,  and Level 3 Communications,  a telecommunications  and
information  services company,  were among those that suffered what I believe to
be temporary  setbacks.  Yet, because the fundamentals of these companies remain
strong,  I'm optimistic about their long-term  prospects and continue to hold on
to the positions.

- --------------------------------------------------------------------------------
Portfolio Asset Mix                     June 30, 1998     December 31, 1997
Equities                                    86.8%               81.0%
  Foreign                                    8.6%                7.2%
Top 10 Equities                             41.2%               42.4%
Number of Stocks                              35                  33
Cash & Cash Equivalents                     13.2%               19.0%
- --------------------------------------------------------------------------------

Continue to Uncover Great Ideas

     My outlook for the U.S. and global  economies  is  positive.  I believe the
persistence  of financial  instability in Asia will keep interest rates in check
and inflation under control.  At the same time,  heightened  problems in the Far
East have  increased  fears about  earnings  pressure for  companies  with Asian
exposure. Many of our companies, however, have proven resilient to this pressure
because of their strengths in other geographies.  For them, the Asian crisis may
actually prove to be an opportunity to gain market share in weaker economies. As
in the past,  we'll  continue to look for such  companies - those whose business
fundamentals transcend the vagaries of the marketplace.

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

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   7
<PAGE>

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

- --------------------------------------------------------------------------------
Average Annual Total Return(1)
For the Periods Ended June 30, 1998
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 5/1/97)
  1 Year                                          41.24%
  From Inception                                  54.37%
- --------------------------------------------------------------------------------
S&P 500 Index
  1 Year                                          30.17%
  From Inception Date of Institutional Shares     36.91%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                          40.63%
  From Inception                                  53.69%
- --------------------------------------------------------------------------------

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

      JANUS ASPEN CAPITAL APPRECIATION PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Common Stock - 86.8%
- --------------------------------------------------------------------------------
Applications Software - 0.6%
         2,300   Intuit, Inc.*                                     $     140,875
- --------------------------------------------------------------------------------
Automotive - Cars and Light Trucks - 2.4%
         9,725   Ford Motor Co.                                          573,775
- --------------------------------------------------------------------------------
Cable Television - 2.4%
        15,270   Tele-Communications, Inc. - Class A*                    586,941
- --------------------------------------------------------------------------------
Computer Software - 4.9%
        10,900   Microsoft Corp.*                                      1,181,287
- --------------------------------------------------------------------------------
Computers - Integrated Systems - 2.4%
        11,640   Saville Systems Ireland PLC (ADR)*                      583,455
- --------------------------------------------------------------------------------
Computers - Memory Devices - 4.4%
        25,762   VERITAS Software Corp.*                               1,065,903
- --------------------------------------------------------------------------------
Computers - Micro - 2.3%
         5,863   Dell Computer Corp.*                                    544,160
- --------------------------------------------------------------------------------
Cosmetics and Toiletries - 3.8%
        15,950   Gillette Co.                                            904,166
- --------------------------------------------------------------------------------
Data Processing and Management - 2.1%
         7,730   LHS Group, Inc.*                                        509,214
- --------------------------------------------------------------------------------
Diversified Operations - 1.9%
         9,880   CBS Corp.                                               313,690
         1,430   General Electric Co.                                    130,130
- --------------------------------------------------------------------------------
                                                                         443,820
- --------------------------------------------------------------------------------
Educational Software - 2.5%
        11,270   CBT Group PLC (ADR)*                                    602,945
- --------------------------------------------------------------------------------
Electronic Components - Semiconductors - 2.6%
        10,690   Texas Instruments, Inc.                                 623,361
- --------------------------------------------------------------------------------
Finance - Credit Card - 4.0%
         8,390   American Express Co.                                    956,460
- --------------------------------------------------------------------------------
Finance - Investment Bankers/Brokers - 5.4%
         3,375   Merrill Lynch & Co., Inc.                               311,344
        10,945   Morgan Stanley, Dean Witter, Discover and Co.         1,000,099
- --------------------------------------------------------------------------------
                                                                       1,311,443
- --------------------------------------------------------------------------------
Finance - Other Services - 1.6%
         8,055   Newcourt Credit Group, Inc. - New York Shares     $     396,205
- --------------------------------------------------------------------------------
Internet Content - 2.8%
        14,205   At Home Corp. - Class A*                                672,074
- --------------------------------------------------------------------------------
Internet Software - 9.6%
        15,285   America Online, Inc.*                                 1,620,210
        15,240   Exodus Communications, Inc.*                            681,990
- --------------------------------------------------------------------------------
                                                                       2,302,200
- --------------------------------------------------------------------------------
Medical - Biomedical and Genetic - 1.0%
         7,065   Incyte Pharmaceuticals, Inc.*                           241,093
- --------------------------------------------------------------------------------
Medical - Drugs - 6.9%
         8,965   Eli Lilly and Co.                                       592,250
         7,519   Pfizer, Inc.                                            817,221
         3,504   Warner-Lambert Co.                                      243,090
- --------------------------------------------------------------------------------
                                                                       1,652,561
- --------------------------------------------------------------------------------
Money Center Banks - 4.4%
        10,720   BankAmerica Corp.                                       926,610
           948   Citicorp                                                141,489
- --------------------------------------------------------------------------------
                                                                       1,068,099
- --------------------------------------------------------------------------------
Multi-line Insurance - 1.8%
         2,920   American International Group, Inc.                      426,320
- --------------------------------------------------------------------------------
Multimedia - 0.8%
         2,325   Time Warner, Inc.                                       198,642
- --------------------------------------------------------------------------------
Networking Products - 3.0%
         7,865   Cisco Systems, Inc.*                                    724,072
- --------------------------------------------------------------------------------
Radio - 2.1%
        10,210   Chancellor Media Corp.*                                 506,990
- --------------------------------------------------------------------------------
Retail - Building Products - 2.7%
         7,880   Home Depot, Inc.                                        654,532
- --------------------------------------------------------------------------------
Super - Regional Banks - 3.0%
        16,905   U.S. Bancorp                                            726,915
- --------------------------------------------------------------------------------
Telecommunication Equipment - 2.0%
         8,455   Northern Telecom, Ltd.                                  479,821
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   8
<PAGE>

      JANUS ASPEN CAPITAL APPRECIATION PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Telecommunication Services - 3.4%
         8,060   Level 3 Communications, Inc.*                     $     596,440
         6,035   Qwest Communications International, Inc.*               210,471
- --------------------------------------------------------------------------------
                                                                         806,911
- --------------------------------------------------------------------------------
Total Common Stock (cost $16,418,156)                                 20,884,240
- --------------------------------------------------------------------------------
U.S. Government Agency - 8.7%
                 Freddie Mac
  $  2,100,000      5.85%, 7/1/98 (amortized cost $2,100,000)          2,100,000
- --------------------------------------------------------------------------------
Total Investments (total cost $18,518,156) - 95.5%                    22,984,240
- --------------------------------------------------------------------------------
Cash, Receivables and Other Assets, net of Liabilities - 4.5%          1,080,137
- --------------------------------------------------------------------------------
Net Assets - 100%                                                  $  24,064,377
- --------------------------------------------------------------------------------


                       Summary of Investments by Country
                                 June 30, 1998

Country                     % of Investment Securities             Market Value
- --------------------------------------------------------------------------------
Canada                                   3.8%                     $      876,027
Ireland                                  5.2%                          1,186,400
United States++                         91.0%                         20,921,813
- --------------------------------------------------------------------------------
Total                                  100.0%                     $   22,984,240
================================================================================
++Includes Short-Term Securities (81.9% excluding Short-Term Securities)

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   9
<PAGE>

JANUS ASPEN INTERNATIONAL GROWTH PORTFOLIO Portfolio Manager, Helen Young Hayes

     During the six-month period ended June 30, 1998, Janus Aspen  International
Growth Portfolio returned 22.22% for its Institutional Shares and 21.89% for its
Retirement Shares versus a 15.93% gain for the Morgan Stanley International EAFE
Index.  All returns  include  reinvested  dividends.  The average  annual  total
returns for the period ended June 30, 1998, follow on the next page.

     Before  discussing  our  performance  in  greater  detail,  I would like to
announce a very positive development regarding management of the Portfolio - the
promotion of Laurence Chang from assistant portfolio manager to co-manager. I am
pleased  to  see  my   colleague   of  five   years  take  on  this   additional
responsibility,  and  believe  it is in the  best  long-term  interest  for  the
Portfolio's continued success.

Asia Struggles as Europe Excels

     The Portfolio's  solid  performance was  particularly  impressive given the
volatility of the foreign  markets during the first half. The continued  decline
of Asian  economies,  underscored  by the breakdown of the yen and Japan's first
official  recession  in 20 years,  was very much in line with our  expectations.
However, because our exposure to Asia was limited, its impact on the Portfolio's
performance was minimal.

     Our focus on European  stocks,  which  comprised  approximately  80% of the
Portfolio, drove our impressive gains. Economic growth in Europe continues to be
aided by the pending  European  Monetary  Union (EMU),  as well as a move on the
part of a growing number of individual  companies toward the corporate  reforms,
such as restructuring, that have so well served American businesses.

     Latin America was somewhat  bruised by emerging market fears,  particularly
those regarding  renewed turmoil in Asia. A general increase in the risk premium
of emerging  market stocks  caused Latin  American  markets to suffer.  However,
economic  reform  in the  region  continues,  and  we  remain  optimistic  about
high-quality franchise names, such as Groupo Televisa and Telebras.

- --------------------------------------------------------------------------------
Portfolio Asset Mix                     June 30, 1998     December 31, 1997
Equities                                    93.8%               91.6%
  Foreign                                   92.6%               90.1%
Number of Stocks                             201                 188
Top 10 Equities                             17.4%               22.9%
Cash & Fixed-Income Securities               6.2%                8.4%
- --------------------------------------------------------------------------------

Top Performers Embrace Trends

     Our  longtime   holding  in  Philips   Electronics,   a   Netherlands-based
manufacturer of semiconductors and consumer  electronics,  was a standout during
the  period.  The  company's  cost-cutting  plans  appear  to be well  ahead  of
expectations. Additionally, its embracing of global economic trends, such as the
enhancement of  shareholder  value and the rapid  restructuring  of its business
portfolio,  helped boost returns.  Most recently,  Philips announced the sale of
PolyGram,  its entertainment unit - a clear sign of the company's  commitment to
spin off its non-core divisions.

     The Portfolio's telecommunications holdings also did well, with exceptional
results from our telecommunications equipment manufacturers, including Nokia and
Ericsson,  as well as Mannesmann,  a German  industrial  and  telecommunications
service provider recently added to the Portfolio. These companies are benefiting
from  deregulation and increased demand for second lines because of Internet and
data traffic. We anticipate increased investment  opportunities to evolve as new
entrants take on the industry's  European  monopoly  operators.  And in terms of
growth, we view the most exciting markets as Italy and Scandinavia.

     We  also  benefited  from  our  exposure  to  pharmaceutical   stocks.  Our
enthusiasm for drug companies was fueled by the continued  shortening of product
development  times and  consolidation  within the industry.  An increase in drug
pipelines  also  helped  accelerate  the  earnings  of  several   pharmaceutical
companies, particularly in Europe. This included Irish-based Elan, a position we
significantly  increased during the half, and Schering, a German  pharmaceutical
company recently added to the Portfolio.

     Although  the  Portfolio  performed  well  overall,  the first half was not
without its  disappointments.  Powerscreen,  a manufacturer of equipment for the
mining,  construction,  and waste  disposal  industries,  reported weak earnings
because of accounting issues at one of its primary subsidiaries. As a result, we
elected to sell this stock at a loss.

Global Outlook Good Despite Volatility

     Uncertainties  about  Asian  currency  devaluations,  global  macroeconomic
trends, and excessive economic growth in the U.S. have contributed to the recent
nervousness in the markets.  While we believe  volatility is likely to continue,
our outlook for global  markets is  cautiously  optimistic.  The  resurgence  of
financial  turbulence  in Asia and a sharp  decrease  in  commodity  prices have
helped reduce global  inflationary  pressures,  which should  support a positive
interest rate  environment  going forward.  In addition,  as Europe continues to
move toward  government  deregulation,  corporate  restructuring,  and  industry
consolidation,  we look for  earnings  growth,  as well as stock  prices,  among
European companies to accelerate.

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

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT  10
<PAGE>

JANUS ASPEN INTERNATIONAL GROWTH PORTFOLIO Portfolio Manager, Helen Young Hayes

- --------------------------------------------------------------------------------
Average Annual Total Return(1)
For the Periods Ended June 30, 1998
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 5/2/94)
  1 Year                                          22.42%
  From Inception                                  22.58%
- --------------------------------------------------------------------------------
Morgan Stanley Capital International EAFE Index(2)
  1 Year                                           6.10%
  From Inception Date of Institutional Shares      8.23%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                          21.82%
  From Inception                                  29.10%
- --------------------------------------------------------------------------------

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

(2) Net  dividends  reinvested  are the  dividends  that remain to be reinvested
    after  foreign tax  obligations  have been met. Such  obligations  vary from
    country to country. EAFE stands for Europe,  Australasia,  and the Far East.
    Neither  the U.S.  market  nor the  emerging  markets of Latin  America  and
    Eastern Europe are represented in EAFE.

      JANUS ASPEN INTERNATIONAL GROWTH PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Common Stock - 90.9%
- --------------------------------------------------------------------------------
Airlines - 0.6%
        25,617   Deutsche Lufthansa A.G.**                         $     645,025
        14,454   SAS Danmark A/S                                         290,046
        14,254   SAS Norge A.S.A. - Class B                              243,339
        19,873   SAS Sverige A.B.**                                      356,346
- --------------------------------------------------------------------------------
                                                                       1,534,756
- --------------------------------------------------------------------------------
Appliances - 1.3%
       195,770   Electolux A.B. - Series B**                           3,363,093
- --------------------------------------------------------------------------------
Audio and Video Products - 1.6%
        49,000   Sony Corp.**                                          4,219,113
- --------------------------------------------------------------------------------
Automotive - Cars and Light Trucks - 2.4%
           860   Bayerische Motoren Werke (BMW) A.G.**                   869,512
           258   Bayerische Motoren Werke (BMW) A.G. - New**             257,281
        36,000   Honda Motor Co., Ltd.**                               1,281,401
        52,007   Renault S.A.**                                        2,958,174
           920   Volkswagen A.G.**                                       888,382
- --------------------------------------------------------------------------------
                                                                       6,254,750
- --------------------------------------------------------------------------------
Automotive - Truck Parts and Equipment - 0.3%
         6,602   Valeo S.A.**                                            674,829
- --------------------------------------------------------------------------------
Beverages - Non-Alcoholic - 0.1%
        13,650   Coca-Cola Femsa S.A. (ADR)                              237,169
- --------------------------------------------------------------------------------
Beverages - Wine and Spirits - 0.8%
       179,618   Diageo PLC**                                          2,132,313
- --------------------------------------------------------------------------------
Brewery - 1.0%
        40,465   Companhia Cervejaria Brahma (ADR)                       505,813
        24,060   Fomento Economico Mexicano, S.A. de C.V.                749,697
       146,000   Kirin Brewery Co., Ltd.**                             1,378,100
- --------------------------------------------------------------------------------
                                                                       2,633,610
- --------------------------------------------------------------------------------
Broadcast Services and Programming - 1.8%
        82,980   Grupo Televisa S.A. (GDR)*                            3,122,123
       104,666   Modern Times Group A.B.**                             1,345,246
- --------------------------------------------------------------------------------
                                                                       4,467,369
- --------------------------------------------------------------------------------
Building - Heavy Construction - 0.2%
         5,229   Compagnie Francaise d'Etudes et
                  de Construction Technip**                              639,135
- --------------------------------------------------------------------------------
Building Products - Cement and Aggregate - 0.3%
        20,336   Cimpor-Cimentos de Portugal, S.A.                 $     714,490
- --------------------------------------------------------------------------------
Cellular Telecommunications - 2.9%
        10,597   Cellular Communications International, Inc.*            528,525
       788,000   China Telecom, Ltd.*,+                                1,367,813
        12,858   Millicom International Cellular S.A.*                   562,538
         2,643   Telecel-Comunicacaoes Pessoais S.A.                     469,307
       472,870   Telecom Italia Mobile S.p.A.                          2,885,290
       227,218   Telecom Italia S.p.A.                                 1,660,083
- --------------------------------------------------------------------------------
                                                                       7,473,556
- --------------------------------------------------------------------------------
Chemicals - Diversified - 3.2%
        19,022   Akzo Nobel N.V.**                                     4,228,520
        12,167   BASF A.G.**                                             578,006
        26,513   Hoechst A.G.**                                        1,332,969
        71,986   Imperial Chemical Industries PLC**                    1,155,445
       830,000   SNIA BPD S.p.A.+                                      1,014,182
- --------------------------------------------------------------------------------
                                                                       8,309,122
- --------------------------------------------------------------------------------
Chemicals - Specialty - 0.4%
        41,000   Rhodia S.A.**                                         1,143,329
- --------------------------------------------------------------------------------
Closed-End Funds - 0.1%
           163   Romania Investment Fund+                                167,872
- --------------------------------------------------------------------------------
Commercial Banks - 2.0%
        18,522   Banco Central Hispanoamericano                          583,160
         4,575   BG Bank A/S                                             283,354
        40,500   Corporacion Bancaria de Espana S.A.                     910,053
         7,819   Credit Commercial de France**                           658,262
        64,894   Credito Italiano S.p.A.                                 337,293
        52,022   Den norske Bank A.S.A.                                  272,532
         6,793   Erste Bank Der Oesterreichischen
                  Sparkassen A.G.+                                       411,891
       101,951   Merita PLC - Class A                                    672,676
        16,369   National Australia Bank, Ltd.                           215,906
        10,995   Royal Bank of Canada                                    666,186
         2,500   Uniao de Bancos Brasileiros S.A. (GDR)                   73,750
- --------------------------------------------------------------------------------
                                                                       5,085,063
- --------------------------------------------------------------------------------
Commercial Services - 0.1%
        10,190   ICON PLC (ADR)                                          257,298
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   11
<PAGE>

      JANUS ASPEN INTERNATIONAL GROWTH PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Computer Services - 4.8%
         5,390   Atos S.A.*,**                                     $   1,292,667
        21,921   Cap Gemini S.A.**                                     3,444,401
         4,380   ECsoft Group PLC (ADR)                                  141,803
        19,636   Electronisk Databehandling A.S.A.                        75,488
        53,317   Getronics N.V.**                                      2,765,157
        79,550   Logica PLC**                                          2,578,264
        32,373   Misys PLC**                                           1,839,189
         4,060   WM-Data A.B. - Class B**                                141,019
- --------------------------------------------------------------------------------
                                                                      12,277,988
- --------------------------------------------------------------------------------
Computer Software - 2.1%
         4,633   Cap Gemini N.V.**                                       382,625
        19,844   JBA Holdings PLC**                                      205,280
        38,000   Meitec**                                              1,314,260
        30,535   Merkantildata A.S.A.                                    385,988
            31   NTT Data Corp.**                                      1,119,069
        24,717   Tieto Corp. - Class B                                 1,878,615
- --------------------------------------------------------------------------------
                                                                       5,285,837
- --------------------------------------------------------------------------------
Computers - Integrated Systems - 1.7%
        26,125   Saville Systems Ireland PLC (ADR)                     1,309,516
       262,008   SEMA Group PLC**                                      3,104,367
- --------------------------------------------------------------------------------
                                                                       4,413,883
- --------------------------------------------------------------------------------
Consulting Services - 0.1%
         4,319   Mandator A.B.**                                         168,970
- --------------------------------------------------------------------------------
Consumer Products - 0.3%
        15,130   Hagemeyer N.V.**                                        654,521
- --------------------------------------------------------------------------------
Cosmetics and Toiletries - 0.5%
        86,000   Kao Corp.**                                           1,326,071
- --------------------------------------------------------------------------------
Cruise Lines - 0.8%
       437,808   NCL Holdings A.S.A.                                   2,162,356
- --------------------------------------------------------------------------------
Diversified Operations - 6.8%
       892,480   First Pacific Co., Ltd.                                 374,335
       157,979   General Electric Co. PLC**                            1,361,432
        45,444   Hays PLC**                                              762,024
         3,849   Lagardere S.C.A.**                                      160,236
        50,549   Ordina N.V.**                                         1,637,576
         4,479   Ratin A/S - B Shares                                    947,642
       695,991   Rentokil Initial PLC**                                5,005,035
       193,468   Siebe PLC**                                           3,863,932
        13,821   Siemens A.G.**                                          843,410
        38,739   Smiths Industries PLC**                                 540,999
            69   Sulzer A.G.**                                            54,452
        12,257   Tomkins PLC**                                            66,516
         5,942   Vivendi**                                             1,268,787
        67,860   Williams PLC**                                          437,045
- --------------------------------------------------------------------------------
                                                                      17,323,421
- --------------------------------------------------------------------------------
Drug Delivery Systems - 0.9%
        34,377   Elan Corp. PLC (ADR)*                                 2,210,871
- --------------------------------------------------------------------------------
Educational Software - 0.6%
        28,250   CBT Group PLC (ADR)                                   1,511,375
- --------------------------------------------------------------------------------
Electric - Integrated - 0.6%
         4,344   Companhia Energetica de Minas Gerais (ADR)              132,504
       102,375   Companhia Paranaense de Energia-Copel (ADR)             946,969
        22,474   Endesa S.A.                                             492,522
         7,595   Mosenergo (ADR)+                                         36,076
- --------------------------------------------------------------------------------
                                                                       1,608,071
- --------------------------------------------------------------------------------
Electric Products - 0%
         2,941   Samsung Electronics+                                     46,688
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
Electronic Components - 3.2%
       218,991   Electrocomponents PLC**                           $   1,717,316
        38,547   Philips Electronics N.V.**                            3,240,323
        37,295   Philips Electronics N.V. - N.Y. Shares**              3,170,075
- --------------------------------------------------------------------------------
                                                                       8,127,714
- --------------------------------------------------------------------------------
Electronic Components - Semiconductors - 0.3%
         4,620   ASM Lithography Holding N.V. (ADR)*                     134,269
         7,000   Rohm Co., Ltd.**                                        716,214
- --------------------------------------------------------------------------------
                                                                         850,483
- --------------------------------------------------------------------------------
Electronic Measuring Instruments - 0.6%
         1,080   Compagnie des Signeaux S.A.**                           103,962
         6,884   Simac Techniek N.V.**                                 1,445,008
- --------------------------------------------------------------------------------
                                                                       1,548,970
- --------------------------------------------------------------------------------
Fiber Optics - 0%
         5,190   JDS Fitel, Inc.                                          86,468
- --------------------------------------------------------------------------------
Finance - Investment Bankers/Brokers - 0.5%
       115,000   Nomura Securities Co., Ltd.**                         1,338,177
- --------------------------------------------------------------------------------
Finance - Other Services - 0.9%
        42,040   Newcourt Credit Group, Inc.                           2,006,885
         5,985   Newcourt Credit Group, Inc. - New York Shares           294,387
- --------------------------------------------------------------------------------
                                                                       2,301,272
- --------------------------------------------------------------------------------
Food - Catering - 0.6%
       135,016   Compass Group PLC**                                   1,554,392
- --------------------------------------------------------------------------------
Food - Dairy Products - 0%
         2,245   Koninklijke Numico N.V.**                                70,300
- --------------------------------------------------------------------------------
Food - Diversified - 1.6%
         9,571   Danone**                                              2,638,899
        76,220   Raisio Group PLC                                      1,383,675
- --------------------------------------------------------------------------------
                                                                       4,022,574
- --------------------------------------------------------------------------------
Food - Retail - 0.7%
         5,750   Disco S.A. (ADR)*                                       184,000
        39,466   Koninklijke Ahold N.V.**                              1,266,887
        42,280   Santa Isabel S.A. (ADR)                                 465,080
- --------------------------------------------------------------------------------
                                                                       1,915,967
- --------------------------------------------------------------------------------
Human Resources - 1.8%
       141,400   Capita Group PLC**                                    1,216,198
        38,249   Select Appointments Holdings PLC**                      545,648
        92,590   Select Appointments Holdings PLC (ADR)**              2,731,405
- --------------------------------------------------------------------------------
                                                                       4,493,251
- --------------------------------------------------------------------------------
Investment Management and Advisory Services - 0.4%
       104,621   Amvescap PLC**                                        1,021,177
- --------------------------------------------------------------------------------
Life and Health Insurance - 0.7%
         2,076   Schweizerische Lebensversicherungs-
                  und Rentenanstalt**                                  1,757,361
- --------------------------------------------------------------------------------
Machinery - General Industrial - 0.9%
        23,682   Alstom*,**                                              779,473
        15,780   Mannesmann A.G.**                                     1,621,681
- --------------------------------------------------------------------------------
                                                                       2,401,154
- --------------------------------------------------------------------------------
Medical - Biomedical and Genetic - 0.2%
           294   Ares-Serono Group - Class B**                           408,976
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   12
<PAGE>

      JANUS ASPEN INTERNATIONAL GROWTH PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Medical - Drugs - 6.2%
        90,697   Astra A.B. - Class A**                            $   1,853,757
        18,836   Merck KGaA**                                            844,213
         1,891   NeuroSearch A.S.                                        146,287
         1,336   Novartis A.G.**                                       2,223,127
         3,243   Novo Nordisk A/S - Class B                              447,049
        11,215   Pharmacia & Upjohn, Inc.                                517,292
        28,465   Rhone-Poulenc - Class A**                             1,605,444
            23   Roche Holding A.G.**                                    225,859
         7,449   Sanofi S.A.**                                           875,986
        20,642   Schering A.G.**                                       2,430,107
        35,175   SmithKline Beecham PLC (ADR)                          2,128,088
         2,252   Synthelabo**                                            379,925
        60,000   Takeda Chemical Industries**                          1,595,267
        12,756   Zeneca Group PLC**                                      547,407
- --------------------------------------------------------------------------------
                                                                      15,819,808
- --------------------------------------------------------------------------------
Medical - Wholesale Drug Distributors - 0%
         3,306   Grupo Casa Autrey S.A. de C.V. (ADR)                     21,489
- --------------------------------------------------------------------------------
Medical Products - 0.1%
        19,473   Ortivus A.B. - B Shares*,**                             305,221
- --------------------------------------------------------------------------------
Metal Processors and Fabricators - 0.7%
        42,528   Assa Abloy A.B. - Class B**                           1,671,801
- --------------------------------------------------------------------------------
Money Center Banks - 9.3%
       411,014   Banca Commerciale Italiana                            2,460,465
     1,527,795   Banca di Roma*                                        3,088,165
         2,534   Banco Bilbao Vizcaya S.A.                               130,267
        21,874   Bank Austria A.G.                                     1,779,166
         4,720   Credit Suisse Group**                                 1,050,230
        33,250   Deutsche Bank A.G.**                                  2,811,000
         9,346   Dresdner Bank A.G.**                                    504,830
        11,897   ING Groep N.V.**                                        779,011
       237,015   Lloyds TSB Group PLC**                                3,327,792
        58,778   National Westminster Bank PLC**                       1,050,341
        28,130   Schroders PLC**                                         725,614
        60,700   Skandinaviska Enskilda Banken - Class A**             1,038,947
        50,691   Standard Chartered PLC**                                581,380
        11,850   UBS A.G.**                                            4,406,218
- --------------------------------------------------------------------------------
                                                                      23,733,426
- --------------------------------------------------------------------------------
Mortgage Banks - 0.9%
        17,622   Deutsche Pfandbrief-und
                  Hypothekenbank A.G.**                                1,409,733
        29,129   Sparebanken                                             835,127
- --------------------------------------------------------------------------------
                                                                       2,244,860
- --------------------------------------------------------------------------------
Multi-Line Insurance - 4.0%
         1,557   Allianz A.G.**                                          518,847
            45   Allianz A.G. - New**                                     14,870
        54,463   Assicurazioni Generali                                1,762,652
           290   Baloise Holding, Ltd.**                                 237,459
         7,355   ERGO Versicherungs Gruppe A.G.**                      1,320,208
        14,154   Pohjola Insurance Group - Class B                       701,704
        80,213   Royal & Sun Alliance Insurance Group PLC**              829,110
        58,869   Sampo Insurance Co., Ltd. - Class A                   2,789,754
        27,087   Storebrand A.S.A.*                                      240,035
         3,031   Zurich Versicherungs-Gesellschaft**                   1,934,327
- --------------------------------------------------------------------------------
                                                                      10,348,966
- --------------------------------------------------------------------------------
Music/Clubs - 0.1%
         3,552   PolyGram N.V.**                                         181,247
- --------------------------------------------------------------------------------
Office Furnishings - 0.2%
        19,404   Koninklijke Ahrend Groep N.V.**                         633,375

- --------------------------------------------------------------------------------
Oil Companies - Integrated - 2.3%
        22,877   Elf Aquitaine S.A.**                              $   3,216,235
         1,665   Lukoil Holding (ADR)                                     54,971
        17,013   Total S.A.**                                          2,211,736
        13,400   YPF S.A. (ADR)                                          402,838
- --------------------------------------------------------------------------------
                                                                       5,885,780
- --------------------------------------------------------------------------------
Paper and Related Products - 0%
        11,500   Kimberly-Clark de Mexico, S.A. de C.V. - Class A         40,632
- --------------------------------------------------------------------------------
Publishing - Books - 2.2%
        40,117   Wolters Kluwer N.V.**                                 5,506,118
- --------------------------------------------------------------------------------
Reinsurance - 0.4%
         1,893   Muenchener Rueckversicherungs-
                  Gesellschaft A.G.**                                    939,665
- --------------------------------------------------------------------------------
Retail - Building Products - 0.2%
         2,620   Castorama Dubois Investisse**                           461,076
- --------------------------------------------------------------------------------
Retail - Discount - 0%
        36,900   Cifra S.A. de C.V. - Class C                             50,919
        49,371   Cifra S.A. de C.V. - Class V                             74,062
- --------------------------------------------------------------------------------
                                                                         124,981
- --------------------------------------------------------------------------------
Retail - Diversified - 0.5%
        28,000   Ito-Yokado Co., Ltd.**                                1,317,430
- --------------------------------------------------------------------------------
Retail - Pubs - 0%
        14,635   J.D. Wetherspoon PLC**                                   70,447
- --------------------------------------------------------------------------------
Retail - Restaurants - 1.0%
       233,071   Tele Pizza S.A.*                                      2,512,033
- --------------------------------------------------------------------------------
Security Services - 2.7%
       141,853   Securitas A.B. - Class B**                            6,945,952
- --------------------------------------------------------------------------------
Special Purpose Banks - 0.1%
            88   Dexia Belgium (Credit Communal)+                         13,244
         1,114   Dexia France**                                          149,982
- --------------------------------------------------------------------------------
                                                                         163,226
- --------------------------------------------------------------------------------
Telecommunication Equipment - 2.5%
         9,316   Alcatel Alsthom**                                     1,896,779
         3,205   Alcatel Alsthom (ADR)**                                 130,403
        33,120   Nokia Oyj - Class A                                   2,444,844
        44,930   Telefonaktiebolaget L.M. Ericsson - Class B**         1,312,697
        18,054   Telefonaktiebolaget L.M. Ericsson
                  (ADR) - Class B**                                      516,796
- --------------------------------------------------------------------------------
                                                                       6,301,519
- --------------------------------------------------------------------------------
Telecommunication Services - 2.3%
        42,480   Clearnet Communications, Inc. - Class A*                467,280
        48,545   COLT Telecom Group PLC**                              1,968,235
       161,670   Energis PLC*,**                                       2,461,644
        21,700   STET Hellas Telecommunications S.A. (ADR)               900,550
- --------------------------------------------------------------------------------
                                                                       5,797,709
- --------------------------------------------------------------------------------
Telephone - Integrated - 3.8%
        15,980   Companhia de Telecommunicaciones
                  de Chile S.A. (ADR)                                    324,594
        45,141   Global TeleSystems Group, Inc.                        2,200,624
        22,857   Hellenic Telecommunication Organization S.A.+           585,923
           368   Nippon Telegraph & Telephone Corp.**                  3,049,320
        15,700   Nortel Inversora S.A. (ADR)                             390,537
        17,410   Portugal Telecom S.A.                                   922,715
         8,800   Telecom Argentina Stet S.A. (ADR)                       262,350
        21,300   Telefonica de Argentina S.A. (ADR)                      690,919
        18,832   Telefonica de Espana                                    872,159
        11,435   Telefonos de Mexico S.A. (ADR)                          549,595
- --------------------------------------------------------------------------------
                                                                       9,848,736
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   13
<PAGE>

      JANUS ASPEN INTERNATIONAL GROWTH PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Textile - Apparel - 0.2%
         5,690   Chargeurs S.A.**                                  $     470,086
- --------------------------------------------------------------------------------
Tobacco - 0.3%
         7,535   Empresas La Moderna S.A. de C.V. (ADR)                  178,014
        26,004   Tabacalera S.A. - Class A+                              533,365
- --------------------------------------------------------------------------------
                                                                         711,379
- --------------------------------------------------------------------------------
Travel Services - 0.2%
            98   Kuoni Reisen A.G. - Class B**                           486,508
- --------------------------------------------------------------------------------
Total Common Stock (cost $187,350,853)                               232,738,625
- --------------------------------------------------------------------------------
Preferred Stock - 2.7%
- --------------------------------------------------------------------------------
Automotive - Cars and Light Trucks - 1.4%
         1,266   Porsche A.G.**                                        3,647,134
- --------------------------------------------------------------------------------
Insurance Brokers - 0.4%
         2,142   Marschollek, Lautenschlaeger
                  und Partner A.G.**                                   1,044,279
- --------------------------------------------------------------------------------
Retail - Building Products - 0.2%
         7,198   Hornbach Holding A.G.**                                 657,977
- --------------------------------------------------------------------------------
Telephone - Integrated - 0.7%
        15,637   Telecomunicacoes Brasileiras S.A. (ADR)               1,707,365
- --------------------------------------------------------------------------------
Total Preferred Stock (cost $5,800,577)                                7,056,755
- --------------------------------------------------------------------------------
Rights - 0.2%
           580   Baloise Holding, Ltd.** (cost $0)                       474,535
- --------------------------------------------------------------------------------
U.S. Government Obligation - 0.3%
  $    700,000   U.S. Treasury Note 5.075%
                    due 10/1/98 (cost $691,047)                          691,103
- --------------------------------------------------------------------------------
U.S. Government Agency - 9.8%
                 Freddie Mac
    25,000,000      5.85% 7/1/98
                    (amortized cost $25,000,000)                      25,000,000
- --------------------------------------------------------------------------------
Total Investments (total cost $218,842,477) - 103.9%                 265,961,018
- --------------------------------------------------------------------------------
Liabilities, net of Cash, Receivables and Other Assets - (3.9%)     (10,072,818)
- --------------------------------------------------------------------------------
Net Assets - 100%                                                  $ 255,888,200
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   14
<PAGE>

      JANUS ASPEN INTERNATIONAL GROWTH PORTFOLIO June 30, 1998 (unaudited)

                       Summary of Investments by Country
                                 June 30, 1998

Country                     % of Investment Securities             Market Value
- --------------------------------------------------------------------------------
Argentina                                0.7%                     $    1,930,643
Australia                                0.1%                            215,906
Austria                                  0.8%                          2,191,057
Belgium                                  1.3%                          3,366,430
Brazil                                    --                              13,243
Canada                                   1.3%                          3,521,205
Chile                                    0.3%                            789,673
Denmark                                  0.8%                          2,114,377
Finland                                  3.7%                          9,871,267
France                                  10.2%                         27,159,805
Germany                                  8.7%                         23,179,127
Greece                                   0.5%                          1,486,472
Hong Kong                                0.7%                          1,742,147
Ireland                                  1.9%                          5,031,761
Italy                                    4.9%                         13,208,128
Japan                                    7.0%                         18,654,420
Luxembourg                               0.2%                            562,537
Mexico                                   1.9%                          5,023,697
Netherlands                              9.8%                         26,095,010
Norway                                   1.6%                          4,214,865
Portugal                                 0.8%                          2,106,511
Romania                                  0.1%                            167,872
Russia                                    --                              91,047
South Korea                               --                              46,688
Spain                                    2.3%                          6,033,559
Sweden                                   7.2%                         19,019,843
Switzerland                              5.0%                         13,259,050
United Kingdom                          17.3%                         45,927,133
United States++                         10.9%                         28,937,545
- --------------------------------------------------------------------------------
Total                                  100.0%                     $  265,961,018
================================================================================
++Includes Short-Term Securities (1.5% excluding Short-Term Securities)


                           Forward Currency Contracts
                             Open at June 30, 1998

Currency Sold and                Currency           Currency         Unrealized
Settlement Date                 Units Sold        Value in $ U.S.    Gain/(Loss)
- --------------------------------------------------------------------------------
British Pound 7/10/98               500,000         $   833,050       ($11,550)
British Pound 8/7/98              4,380,000           7,285,254       (165,438)
British Pound 8/13/98               900,000           1,496,430        (42,030)
British Pound 10/7/98             6,220,000          10,309,650       (112,244)
Dutch Guilder 7/17/98             2,000,000             982,367             435
Dutch Guilder 7/23/98               375,000             184,266             (9)
Dutch Guilder 7/31/98             4,625,000           2,273,845          10,429
French Franc 7/23/98              1,043,000             172,371           (174)
French Franc 7/31/98              9,157,000           1,514,129           6,933
French Franc 8/7/98                 800,000             132,336           (507)
French Franc 10/21/98             1,500,000             249,198            (95)
German Deutschemark 7/23/98         260,000             144,052              91
German Deutschemark 11/4/98          29,000              16,165             463
German Deutschemark 11/12/98      1,311,000             731,095           2,376
Japanese Yen 7/23/98            200,700,000           1,442,586         168,816
Japanese Yen 8/7/98              92,800,000             667,041          47,658
Japanese Yen 10/7/98            310,000,000           2,228,455         155,912
Japanese Yen 10/21/98           267,000,000           1,919,387        (16,796)
Japanese Yen 11/4/98            129,500,000             930,958          13,761
Swedish Krona 7/17/98               585,000              73,248              24
Swedish Krona 8/7/98                464,000              58,151             (8)
Swedish Krona 10/7/98            20,451,000           2,569,576          28,019
Swiss Franc 7/10/98                  36,000              23,722           1,123
Swiss Franc 7/17/98                 400,000             263,765          13,243
Swiss Franc 7/23/98                 185,000             122,080           6,623
Swiss Franc 7/31/98                 600,000             396,275          20,392
Swiss Franc 10/7/98                 700,000             465,457           6,878
Swiss Franc 11/4/98                  50,000              33,344           1,305
Swiss Franc 12/2/98               2,229,000           1,490,870          18,269
- --------------------------------------------------------------------------------
Total                                               $39,009,123      $  153,899
================================================================================

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   15
<PAGE>

  JANUS ASPEN WORLDWIDE GROWTH PORTFOLIO Portfolio Manager, Helen Young Hayes

     Janus  Aspen  Worldwide  Growth  Portfolio  posted  solid gains for the six
months ended June 30, 1998,  returning 27.02% for the  Institutional  Shares and
26.71%  for  the  Retirement   Shares.   In   comparison,   the  Morgan  Stanley
International   World  Index  gained  16.64%.  All  returns  include  reinvested
dividends.  The average annual total returns for the period ended June 30, 1998,
follow on the next page.

Solid Investments Withstand Volatility

     The Portfolio  performed well despite  heightened  global market volatility
caused  by  economic  tension  in  Asia.  Its  resilience  in the  face  of this
turbulence illustrated the strength of our individual investments, regardless of
geographic location.

     During  the  first  quarter,  investors  came to view the  Asian  crisis as
positive for the global economy, helping to keep a cap on inflation and interest
rates.  However,  market  jitters  resurfaced  in the  second  quarter  when the
Japanese government announced its country had slipped into a recession.  A sharp
breakdown in the yen versus the dollar magnified the market's concerns,  fanning
apprehension  of  another  round of Asian  currency  devaluations.  As a result,
investors began to question the potential  repercussions on corporate  earnings,
adding to the  volatility  in global  markets.  Fortunately,  the  effect on the
Portfolio was minimized by our limited exposure to the Pacific Rim.

- --------------------------------------------------------------------------------
Portfolio Asset Mix                     June 30, 1998     December 31, 1997
Equities                                    96.7%               97.4%
  Foreign                                   73.0%               77.8%
Number of Stocks                             196                 205
Top 10 Equities                             20.1%               21.0%
Cash & Cash Equivalents                      3.3%                2.6%
- --------------------------------------------------------------------------------

Portfolio Gains from Thriving European Stocks

     We continued to hold a significant portion of our assets in Europe, where a
strong economy supported corporate  earnings,  thus boosting many of our stocks.
Accelerating  economic  growth  throughout  the  Continent was also aided by the
pending  European  Monetary  Union  (EMU),  corporate  restructuring,   industry
consolidation,  and  government  deregulation.  The  strong  performance  of our
longtime position in Philips Electronics demonstrated the benefits of several of
these themes. Philips continues to restructure its business portfolio,  spinning
off  underperforming  units. The company stepped up its transformation  with the
announced sale of Polygram,  its entertainment  unit.  Philips also introduced a
share  repurchase  program,  further  demonstrating  its commitment to enhancing
shareholder value.

     Several of our European  financial services stocks also posted solid gains.
Among  them  were  Banca Di Roma and  Banca  Commerciale  Italiana,  which  both
benefited from a drop in interest rates.  United Bank of Switzerland  (UBS) also
climbed as investors  continued to recognize  the value of its  expanding  asset
management business,  fueled in part by a growing acceptance of equity investing
in Europe.

     Much of Europe's growth was also reflected in its consumer cyclical sector.
A standout was Porsche,  a manufacturer of high-end German sports cars and a new
stock in the Portfolio.  We added this position  because of the company's strong
pricing structure, new model introduction and high consumer demand.

     The  Portfolio's  European  technology  stocks  posted solid gains as well,
withstanding  the  second-quarter   downturn  in  this  sector  created  by  the
reemergence of problems in Asia.  Increased computer spending driven by the Year
2000 and EMU  conversions  created a positive  backdrop  for many of our stocks,
including Cap Gemini and  Getronics.  Among our U.S.  technology  stocks,  Cisco
Systems and  Microsoft  also  weathered  the Asian storm  thanks to their strong
business franchises and dominant market positions.

     Our U.S.  stocks,  in  general,  posted  strong  results as  inflation  and
interest rates  remained low,  company  fundamentals  and  profitability  stayed
intact, and productivity improved. Latin America, however, did not fare as well,
and its markets declined on fears of volatility in emerging  countries.  Yet, as
economic  reform  continues in this area, I will consider  increasing  our Latin
American weighting by selectively adding high-quality franchise names.

     Despite  its  impressive  performance,  the  Portfolio  was not  immune  to
disappointments.   Our  performance  was  bruised  slightly  by  Japan's  Nippon
Telegraph and Telephone,  NTT Data, and Sony Corporation,  all of which weakened
as a result of the continuing malaise in Asia.  Fortunately,  our travels to the
Far East early in the year  convinced  us to reduce our  exposure to the region,
and our positions in these stocks were modest.

Bright Future Anticipated for Europe, U.S.

     Overall,  I view  the  global  economies  with  cautious  optimism.  Europe
continues  to  demonstrate  economic  strength and growth that has thus far been
unencumbered  by events in Asia. I will,  therefore,  continue to  capitalize on
opportunities  created by the monetary convergence and by the growing acceptance
of restructuring, consolidation, and shareholder value among European companies.
Benign  inflation,  low interest rates, and strong consumer  spending lead me to
believe growth in the U.S. will also remain steady.

     Meanwhile,  Asia  continues  to  be  crippled  by  economic  and  political
imbalances, with no sign of a near-term recovery.  Therefore, I continue to view
prospects in the Far East with caution, and will set my sights only on companies
that can prosper regardless of the economic climate.

     In  closing,  I would like to thank you for your  continued  investment  in
Janus Aspen Worldwide Growth Portfolio.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   16
<PAGE>

  JANUS ASPEN WORLDWIDE GROWTH PORTFOLIO Portfolio Manager, Helen Young Hayes

- --------------------------------------------------------------------------------
Average Annual Total Return(1)
For the Periods Ended June 30, 1998
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 9/13/93)
  1 Year                                          30.47%
  From Inception                                  26.49%
- --------------------------------------------------------------------------------
Morgan Stanley Capital International World Index(2)
  1 Year                                          17.03%
  From Inception Date of Institutional Shares     15.02%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                          29.82%
  From Inception                                  37.28%
- --------------------------------------------------------------------------------

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

(2) Net  dividends  reinvested  are the  dividends  that remain to be reinvested
    after  foreign tax  obligations  have been met. Such  obligations  vary from
    country to country.


        JANUS ASPEN WORLDWIDE GROWTH PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Common Stock - 95.9%
- --------------------------------------------------------------------------------
Agricultural Biotechnology - 1.6%
       676,875   Monsanto Co.                                      $  37,820,391
- --------------------------------------------------------------------------------
Airlines - 0.4%
       257,454   Deutsche Lufthansa A.G.**                             6,482,584
       146,971   SAS Danmark A/S                                       2,949,244
        38,144   SAS Norge A.S.A. - Class B                              651,181
- --------------------------------------------------------------------------------
                                                                      10,083,009
- --------------------------------------------------------------------------------
Appliances - 1.3%
     1,767,025   Electrolux A.B. - Series B**                         30,355,365
- --------------------------------------------------------------------------------
Applications Software - 1.1%
       177,170   Intuit, Inc.*                                        10,851,663
       318,585   PeopleSoft, Inc.*                                    14,973,495
- --------------------------------------------------------------------------------
                                                                      25,825,158
- --------------------------------------------------------------------------------
Audio and Video Products - 1.7%
       475,700   Sony Corp.**                                         40,959,861
- --------------------------------------------------------------------------------
Automotive - Cars and Light Trucks - 2.7%
         8,811   Bayerische Motoren Werke (BMW) A.G.**                 8,908,461
         2,643   Bayerische Motoren Werke
                  (BMW) A.G. - New*,**                                 2,635,829
       351,000   Honda Motor Co., Ltd.**                              12,493,712
       546,273   Renault S.A.**                                       31,072,177
         9,094   Volkswagen A.G.**                                     8,781,465
- --------------------------------------------------------------------------------
                                                                      63,891,644
- --------------------------------------------------------------------------------
Automotive - Truck Parts and Equipment - 0.3%
        61,468   Valeo S.A.**                                          6,283,004
- --------------------------------------------------------------------------------
Beverages - Non-Alcoholic - 0.1%
       130,720   Coca-Cola Femsa S.A. (ADR)                            2,271,260
- --------------------------------------------------------------------------------
Beverages - Wine and Spirits - 0.2%
       408,764   Diageo PLC**                                          4,852,592
- --------------------------------------------------------------------------------
Brewery - 0.9%
       385,975   Companhia Cervejaria Brahma (ADR)                     4,824,688
       145,040   Fomento Economico Mexicano, S.A. de C.V.              4,519,368
     1,420,000   Kirin Brewery Co., Ltd.**                            13,403,464
- --------------------------------------------------------------------------------
                                                                      22,747,520
- --------------------------------------------------------------------------------
Broadcast Services and Programming - 0.5%
       307,275   Grupo Televisa S.A. (GDR)*                           11,561,222
- --------------------------------------------------------------------------------
Building - Heavy Constuction - 0.3%
        54,447   Compagnie Francaise d'Etudes et
                  de Construction Technip**                        $   6,655,002
- --------------------------------------------------------------------------------
Building Products - Cement and Aggregate - 0.3%
       194,926   Cimpor-Cimentos de Portugal S.A.                      6,848,578
- --------------------------------------------------------------------------------
Cable Television - 2.9%
       518,360   Comcast Corp. - Special Class A                      21,042,176
        98,605   MediaOne Group, Inc.*                                 4,332,457
     1,176,175   Tele-Communications, Inc. - Class A*                 45,209,227
- --------------------------------------------------------------------------------
                                                                      70,583,860
- --------------------------------------------------------------------------------
Cellular Telecommunications - 1.4%
        54,772   Cellular Communications International, Inc.*          2,731,754
     5,108,000   China Telecom, Ltd.*,+                                8,866,481
        14,630   Millicom International Cellular S.A.*                   640,063
     1,041,197   Telecom Italia Mobile S.p.A.                          6,353,026
     2,209,421   Telecom Italia S.p.A.                                16,142,302
- --------------------------------------------------------------------------------
                                                                      34,733,626
- --------------------------------------------------------------------------------
Chemicals - Diversified - 4.3%
       182,303   Akzo Nobel N.V.**                                    40,525,280
       226,845   E.I. du Pont de Nemours and Co.                      16,928,308
       252,872   Hoechst A.G.**                                       12,713,408
       685,494   Imperial Chemical Industries PLC**                   11,002,844
     7,410,544   SNIA BPD S.p.A.+                                      9,054,992
       411,740   Solutia, Inc.                                        11,811,791
- --------------------------------------------------------------------------------
                                                                     102,036,623
- --------------------------------------------------------------------------------
Commercial Banks - 1.7%
       191,740   Banco Central Hispanoamericano                        6,036,885
        72,834   BG Bank A/S                                           4,510,996
       402,824   Corporacion Bancaria de Espana S.A.                   9,051,632
        73,554   Credit Commercial de France**                         6,192,327
       414,512   Den norske Bank A.S.A.                                2,171,538
        69,809   Erste Bank Der Oesterreichischen
                  Sparkassen A.G.+                                     4,232,844
       460,598   Merita PLC - Class A                                  3,039,041
        62,921   National Australia Bank, Ltd.                           829,926
        52,856   Royal Bank of Canada                                  3,202,540
        26,390   Uniao de Bancos Brasileiros S.A. (GDR)                  778,505
- --------------------------------------------------------------------------------
                                                                      40,046,234
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   17
<PAGE>

        JANUS ASPEN WORLDWIDE GROWTH PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Computer Services - 5.0%
        70,690   Atos S.A.*,**                                     $  16,953,263
       212,922   Cap Gemini S.A.**                                    33,455,992
       336,036   Getronics N.V.**                                     17,427,694
       746,890   Logica PLC**                                         24,207,161
       322,926   Misys PLC**                                          18,346,209
       270,600   WM-Data A.B. - Class B**                              9,398,959
- --------------------------------------------------------------------------------
                                                                     119,789,278
- --------------------------------------------------------------------------------
Computer Software - 5.3%
       242,526   JBA Holdings PLC**                                    2,508,859
     1,234,860   Merkantildata A.S.A.                                 15,609,671
       534,400   Microsoft Corp.*                                     57,915,600
           276   NTT Data Corp.**                                      9,963,323
       861,875   Parametric Technology Co.*                           23,378,359
       237,714   Tieto Corp. - Class B                                18,067,443
- --------------------------------------------------------------------------------
                                                                     127,443,255
- --------------------------------------------------------------------------------
Computers - Integrated Systems - 0.1%
       181,220   SEMA Group PLC**                                      2,147,161
- --------------------------------------------------------------------------------
Consumer Products - 0.3%
       154,984   Hagemeyer N.V.**                                      6,704,574
- --------------------------------------------------------------------------------
Cosmetics and Toiletries - 0.8%
       105,560   Estee Lauder Companies, Inc. - Class A                7,356,213
       786,000   Kao Corp.**                                          12,119,752
- --------------------------------------------------------------------------------
                                                                      19,475,965
- --------------------------------------------------------------------------------
Data Processing and Management - 0.1%
        85,410   American Management Systems, Inc.*                    2,556,962
- --------------------------------------------------------------------------------
Diversified Operations - 9.3%
       498,925   CBS Corp.                                            15,840,869
     5,564,820   First Pacific Co., Ltd.                               2,334,063
     1,478,921   General Electric Co. PLC**                           12,745,049
     1,300,578   Hays PLC**                                           21,808,645
        80,594   Lagardere S.C.A.**                                    3,355,179
        26,967   Preussag A.G.**                                       9,651,166
     7,435,482   Rentokil Initial PLC**                               53,470,298
     1,787,023   Siebe PLC**                                          35,690,325
       131,432   Siemens A.G.**                                        8,020,478
           660   Sulzer A.G.**                                           520,843
       121,781   Tomkins PLC**                                           660,881
       702,825   Tyco International, Ltd.                             44,277,975
        58,010   Vivendi**                                            12,386,793
       188,789   Williams PLC**                                        1,215,879
- --------------------------------------------------------------------------------
                                                                     221,978,443
- --------------------------------------------------------------------------------
Drug Delivery Systems - 0.4%
       154,910   Elan Corp. PLC (ADR)*                                 9,962,647
- --------------------------------------------------------------------------------
Electric - Integrated - 0.3%
        71,376   Companhia Energetica de Minas Gerais (ADR)            2,176,980
       213,352   Endesa S.A.                                           4,675,654
        22,000   Mosenergo (ADR)+                                        104,500
- --------------------------------------------------------------------------------
                                                                       6,957,134
- --------------------------------------------------------------------------------
Electronic Components - 3.2%
       658,095   Electrocomponents PLC**                               5,160,748
       370,572   Philips Electronics N.V.**                           31,150,883
       475,848   Philips Electronics N.V. - N.Y. Shares**             40,447,080
- --------------------------------------------------------------------------------
                                                                      76,758,711
- --------------------------------------------------------------------------------
Electronic Components - Semiconductors - 1.2%
        48,630   ASM Lithography Holding N.V. (ADR)*                   1,413,309
        65,000   Rohm Co., Ltd.**                                      6,650,574
       359,145   Texas Instruments, Inc.                              20,942,643
- --------------------------------------------------------------------------------
                                                                      29,006,526
- --------------------------------------------------------------------------------
Film Processing - 0%
         8,125   GrandVision S.A.**                                $     270,115
- --------------------------------------------------------------------------------
Finance - Consumer Loans - 0.3%
       127,295   Household International, Inc.                         6,332,926
- --------------------------------------------------------------------------------
Finance - Investment Bankers/Brokers - 0.7%
        38,315   Morgan Stanley, Dean Witter, Discover and Co.         3,501,033
     1,122,000   Nomura Securities Co., Ltd.**                        13,056,381
- --------------------------------------------------------------------------------
                                                                      16,557,414
- --------------------------------------------------------------------------------
Finance - Other Services - 0.1%
        35,030   Newcourt Credit Group, Inc. - New York Shares         1,723,038
- --------------------------------------------------------------------------------
Food - Catering - 0.8%
     1,623,706   Compass Group PLC**                                  18,693,159
- --------------------------------------------------------------------------------
Food - Dairy Products - 0.2%
       158,505   Koninklijke Numico N.V.**                             4,963,455
- --------------------------------------------------------------------------------
Food - Diversified - 1.1%
        45,418   Danone**                                             12,522,567
       775,480   Raisio Group PLC                                     14,077,833
- --------------------------------------------------------------------------------
                                                                      26,600,400
- --------------------------------------------------------------------------------
Food - Retail - 0.3%
        25,175   Disco S.A. (ADR)*                                       805,600
       203,126   Koninklijke Ahold N.V.**                              6,520,492
- --------------------------------------------------------------------------------
                                                                       7,326,092
- --------------------------------------------------------------------------------
Human Resources - 0.6%
     1,703,956   Capita Group PLC**                                   14,655,926
- --------------------------------------------------------------------------------
Investment Management and Advisory Services - 0.3%
       701,343   Amvescap PLC**                                        6,845,616
- --------------------------------------------------------------------------------
Life and Health Insurance - 0.8%
        23,254   Schweizerische Lebensversicherungs-
                  und Rentenanstalt**                                 19,684,810
- --------------------------------------------------------------------------------
Machinery - General Industrial - 0.9%
       226,924   Alstom*,**                                            7,469,014
       148,370   Mannesmann A.G.**                                    15,247,710
- --------------------------------------------------------------------------------
                                                                      22,716,724
- --------------------------------------------------------------------------------
Medical - Biomedical and Genetic - 0.1%
         1,674   Ares-Serono Group - Class B**                         2,328,662
- --------------------------------------------------------------------------------
Medical - Drugs - 7.4%
       856,173   Astra A.B. - Class A**                               17,499,326
       137,300   Bristol-Myers Squibb Co.                             15,780,919
       124,630   Eli Lilly and Co.                                     8,233,369
       189,580   Merck KGaA**                                          8,496,805
        12,512   Novartis A.G.**                                      20,820,187
        31,105   Novo Nordisk A/S - Class B                            4,287,840
        75,565   Pfizer, Inc.                                          8,212,971
       156,385   Pharmacia & Upjohn, Inc.                              7,213,258
       256,518   Rhone-Poulenc - Class A**                            14,467,783
           246   Roche Holding A.G.**                                  2,415,706
       112,855   Schering A.G.**                                      13,286,003
       164,725   SmithKline Beecham PLC (ADR)                          9,965,863
       571,000   Takeda Chemical Industries**                         15,181,682
       367,073   Warner-Lambert Co.                                   25,465,689
       119,242   Zeneca Group PLC**                                    5,117,126
- --------------------------------------------------------------------------------
                                                                     176,444,527
- --------------------------------------------------------------------------------
Medical - Wholesale Drug Distributors - 0%
        96,739   Grupo Casa Autrey S.A. de C.V. (ADR)                    628,804
- --------------------------------------------------------------------------------
Medical Instruments - 0%
        25,520   U.S. Surgical Corp.                                   1,164,350
- --------------------------------------------------------------------------------
Medical Products - 0.2%
       251,842   Ortivus A.B. - B Shares*,**                           3,947,393
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   18
<PAGE>

        JANUS ASPEN WORLDWIDE GROWTH PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Metal Processors and Fabricators - 1.0%
       617,490   Assa Abloy A.B. - Class B**                       $  24,273,906
- --------------------------------------------------------------------------------
Money Center Banks - 8.8%
     3,900,577   Banca Commerciale Italiana                           23,350,137
     9,359,551   Banca di Roma*                                       18,918,660
        23,722   Banco Bilbao Vizcaya S.A.                             1,219,493
       177,811   Bank Austria A.G.                                    14,462,621
        98,035   BankAmerica Corp.                                     8,473,900
        48,093   Credit Suisse Group**                                10,700,995
       319,507   Deutsche Bank A.G.**                                 27,011,551
        50,331   Dresdner Bank A.G.**                                  2,718,659
       111,134   ING Groep N.V.**                                      7,277,008
     2,079,413   Lloyds TSB Group PLC**                               29,195,848
       172,305   National Westminster Bank PLC**                       3,079,028
       619,139   Skandinaviska Enskilda Banken - Class A**            10,597,246
       494,993   Standard Chartered PLC**                              5,677,125
       122,530   UBS A.G.**                                           45,560,666
        38,197   Unidanmark A/S - Class A                              3,432,557
- --------------------------------------------------------------------------------
                                                                     211,675,494
- --------------------------------------------------------------------------------
Mortgage Banks - 0.7%
       212,930   Deutsche Pfandbrief-und
                  Hypothekenbank A.G.**                               17,034,079
- --------------------------------------------------------------------------------
Multimedia - 1.2%
       338,325   Time Warner, Inc.                                    28,905,642
- --------------------------------------------------------------------------------
Multi-Line Insurance - 3.2%
        15,921   Allianz A.G.**                                        5,305,430
           468   Allianz A.G. - New**                                    154,657
       330,393   Assicurazioni Generali                               10,692,907
         3,550   Baloise Holding, Ltd.**                               2,906,822
        62,298   ERGO Versicherungs Gruppe A.G.**                     11,182,367
     1,570,657   Istituto Nazionale delle Assicurazioni                4,473,706
        39,823   Pohjola Insurance Group - Class B                     1,974,280
       697,851   Royal & Sun Alliance Insurance Group PLC**            7,213,237
       237,688   Sampo Insurance Co., Ltd. - Class A                  11,263,840
       257,711   Storebrand A.S.A.*                                    2,283,737
        29,842   Zurich Versicherungs-Gesellschaft**                  19,044,598
- --------------------------------------------------------------------------------
                                                                      76,495,581
- --------------------------------------------------------------------------------
Music/Clubs - 0.1%
        36,527   PolyGram N.V.**                                       1,863,859
- --------------------------------------------------------------------------------
Networking Products - 3.2%
       822,737   Cisco Systems, Inc.*                                 75,743,225
- --------------------------------------------------------------------------------
Office Furnishings - 0.3%
       205,306   Koninklijke Ahrend Groep N.V.**                       6,701,490
- --------------------------------------------------------------------------------
Oil Companies - Integrated - 2.0%
       237,995   Elf Aquitaine S.A.**                                 33,459,276
        15,410   Lukoil Holding (ADR)                                    508,771
        75,391   Total S.A.**                                          9,801,032
       160,250   YPF S.A. (ADR)                                        4,817,516
- --------------------------------------------------------------------------------
                                                                      48,586,595
- --------------------------------------------------------------------------------
Paper and Related Products - 0%
       123,900   Kimberly-Clark de Mexico, S.A. de C.V. - Class A        437,771
- --------------------------------------------------------------------------------
Publishing - Books - 1.1%
       193,979   Wolters Kluwer N.V.**                                26,623,907
- --------------------------------------------------------------------------------
Recycling - 0.3%
       207,147   Tomra Systems A.S.A.                                  6,208,845
- --------------------------------------------------------------------------------
Reinsurance - 0.4%
        17,960   Muenchener Rueckversicherungs-
                  Gesellschaft A.G.**                                  8,915,156
- --------------------------------------------------------------------------------
Retail - Building Products - 0.2%
        25,095   Castorama Dubois Investisse**                         4,416,300
- --------------------------------------------------------------------------------
Retail - Discount - 0.3%
       282,200   Cifra S.A. de C.V. - Class C                      $     389,413
       530,339   Cifra S.A. de C.V. - Class V                            795,564
        81,870   Costco Companies, Inc.*                               5,162,927
- --------------------------------------------------------------------------------
                                                                       6,347,904
- --------------------------------------------------------------------------------
Retail - Diversified - 0.3%
       168,000   Ito-Yokado Co., Ltd.**                                7,904,600
- --------------------------------------------------------------------------------
Retail - Pubs - 0.1%
       509,505   J.D. Wetherspoon PLC**                                2,452,565
- --------------------------------------------------------------------------------
Retail - Restaurants - 1.2%
        71,770   Starbucks Corp.*                                      3,835,209
     2,283,526   Tele Pizza S.A.*                                     24,611,780
- --------------------------------------------------------------------------------
                                                                      28,446,989
- --------------------------------------------------------------------------------
Security Services - 0.7%
       343,980   Securitas A.B. - Class B**                           16,843,271
- --------------------------------------------------------------------------------
Special Purpose Banks - 0.1%
         2,198   Dexia Belgium (Credit Communal)+                        330,793
        13,100   Dexia France**                                        1,763,703
- --------------------------------------------------------------------------------
                                                                       2,094,496
- --------------------------------------------------------------------------------
Telecommunication Equipment - 3.7%
        88,115   Alcatel Alsthom**                                    17,940,629
        30,290   Alcatel Alsthom (ADR)**                               1,232,424
       471,852   Nokia Oyj - Class A                                  34,831,061
       176,945   Nokia Oyj (ADR) - Class A                            12,839,572
       462,180   Telefonaktiebolaget L.M. Ericsson - Class B**        13,503,280
       289,772   Telefonaktiebolaget L.M. Ericsson
                  (ADR) - Class B**                                    8,294,724
- --------------------------------------------------------------------------------
                                                                      88,641,690
- --------------------------------------------------------------------------------
Telecommunication Services - 1.1%
       403,205   Clearnet Communications, Inc. - Class A*              4,435,255
     1,465,364   Energis PLC*,**                                      22,312,144
- --------------------------------------------------------------------------------
                                                                      26,747,399
- --------------------------------------------------------------------------------
Telephone - Integrated - 2.6%
       153,540   Companhia de Telecommunicaciones
                  de Chile S.A. (ADR)                                  3,118,781
        74,982   Hellenic Telecommunication Organization S.A.+         1,922,109
         3,625   Nippon Telegraph & Telephone Corp.**                 30,037,465
       194,950   Nortel Inversora S.A. (ADR)                           4,849,381
        82,800   Telecom Argentina Stet S.A. (ADR)                     2,468,475
       227,130   Telefonica de Argentina S.A. (ADR)                    7,367,529
       174,380   Telefonica de Espana                                  8,075,995
       102,285   Telefonos de Mexico S.A. (ADR)                        4,916,073
- --------------------------------------------------------------------------------
                                                                      62,755,808
- --------------------------------------------------------------------------------
Telephone - Long Distance - 0.8%
       388,560   WorldCom, Inc.*                                      18,820,875
- --------------------------------------------------------------------------------
Textile - Apparel - 0.1%
        38,906   Chargeurs S.A.**                                      3,214,266
- --------------------------------------------------------------------------------
Tobacco - 0.1%
        75,912   Tabacalera S.A. - Class A+                            1,557,016
- --------------------------------------------------------------------------------
Toys - 0.5%
       286,440   Mattel, Inc.                                         12,119,993
- --------------------------------------------------------------------------------
Travel Services - 0.3%
         1,341   Kuoni Reisen A.G. - Class B**                         6,657,210
- --------------------------------------------------------------------------------
Total Common Stock (cost $1,700,420,558)                           2,293,704,948
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   19
<PAGE>

        JANUS ASPEN WORLDWIDE GROWTH PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Preferred Stock - 0.6%
- --------------------------------------------------------------------------------
Automotive - Cars and Light Trucks - 0.4%
         3,699   Porsche A.G.**                                    $  10,656,198
- --------------------------------------------------------------------------------
Telephone - Integrated - 0.2%
        37,175   Telecomunicacoes Brasileiras S.A. (ADR)               4,059,045
- --------------------------------------------------------------------------------
Total Preferred Stock (cost $14,881,170)                              14,715,243
- --------------------------------------------------------------------------------
Rights - 0.2%
         7,100   Baloise Holding, Ltd. ** (cost $0)                    5,808,964
- --------------------------------------------------------------------------------
Repurchase Agreement - 1.3%
                 Morgan Stanley, Dean Witter, Discover & Co.,
  $ 30,000,000       6.25%, dated 6/30/98, maturing 7/1/98,
                     to be repurchased at $30,005,208,
                     collateralized by $17,576,517 in Fannie
                     Mae 0.472% - 17.28% 6/25/00 - 7/18/28;
                     by $16,845,262 in Freddie Mac 6.00% -
                     855.25%, 10/15/05 - 6/15/35; with
                     respective values of $22,514,898 and
                     $14,643,041 (cost $30,000,000)***                30,000,000
- --------------------------------------------------------------------------------
Short-Term Corporate Notes - 2.1%
                 IBM Credit Corp.
    50,000,000      5.51%, 7/1/98 (amortized cost $50,000,000)        50,000,000
- --------------------------------------------------------------------------------
U.S. Government Agencies - 5.2%
                 Fannie Mae:
    25,000,000      5.46%, 7/13/98                                    24,954,500
    25,000,000      5.75%, 7/27/98                                    24,903,042
    50,000,000      5.40%, 9/14/98                                    49,438,500
                 Freddie Mac:
    10,300,000      5.85%, 7/1/98                                     10,300,000
    15,000,000      5.38%, 7/23/98                                    14,950,683
- --------------------------------------------------------------------------------
Total U.S. Government Agencies (cost $124,545,725)                   124,546,725
- --------------------------------------------------------------------------------
U.S. Government Obligation - 0.2%
                 U.S. Treasury Bill
     6,200,000      5.075%, 10/1/98 (cost $6,120,699)                  6,121,198
- --------------------------------------------------------------------------------
Total Investments (total cost $1,925,968,152) - 105.5%             2,524,897,078
- --------------------------------------------------------------------------------
Liabilities, net of Cash, Receivables and Other Assets - (5.5%)    (131,929,552)
- --------------------------------------------------------------------------------
Net Assets - 100%                                                 $2,392,967,526
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   20
<PAGE>

        JANUS ASPEN WORLDWIDE GROWTH PORTFOLIO June 30, 1998 (unaudited)

                       Summary of Investments by Country
                                 June 30, 1998

Country                     % of Investment Securities             Market Value
- --------------------------------------------------------------------------------
Argentina                                0.8%                     $   20,308,501
Australia                                 --                             829,926
Austria                                  0.8%                         18,695,465
Belgium                                   --                             330,793
Brazil                                   0.5%                         11,839,218
Canada                                   0.4%                          9,360,833
Chile                                    0.1%                          3,118,781
Denmark                                  0.6%                         15,180,637
Finland                                  3.8%                         96,093,070
France                                   8.8%                        222,910,846
Germany                                  7.0%                        177,202,006
Greece                                   0.1%                          1,922,109
Hong Kong                                0.5%                         11,200,544
Ireland                                  0.4%                          9,962,647
Italy                                    3.5%                         88,985,730
Japan                                    6.4%                        161,770,814
Luxembourg                                --                             640,063
Mexico                                   1.0%                         25,519,475
Netherlands                              7.6%                        191,619,031
Norway                                   1.1%                         26,924,972
Portugal                                 0.3%                          6,848,578
Russia                                    --                             613,271
Spain                                    2.2%                         55,228,455
Sweden                                   5.3%                        134,713,470
Switzerland                              5.4%                        136,449,463
United Kingdom                          12.6%                        319,024,288
United States++                         30.8%                        777,604,092
- --------------------------------------------------------------------------------
Total                                  100.0%                     $2,524,897,078
================================================================================
++Includes Short-Term Securities (22.5% excluding Short-Term Securities)


                           Forward Currency Contracts
                             Open at June 30, 1998

Currency Sold and                    Currency         Currency       Unrealized
Settlement Date                     Units Sold     Value in $ U.S.   Gain/(Loss)
- --------------------------------------------------------------------------------
British Pound 7/10/98                 6,500,000      $10,829,650   ($  150,150)
British Pound 8/7/98                 45,300,000       75,347,490    (1,747,536)
British Pound 8/13/98                 9,000,000       14,964,300      (420,300)
British Pound 10/7/98                32,200,000       53,371,500      (521,036)
Dutch Guilder 7/17/98                17,000,000        8,350,115          3,693
Dutch Guilder 7/23/98                 6,500,000        3,193,946          (157)
Dutch Guilder 7/31/98                33,000,000       16,224,189         86,424
French Franc 7/23/98                 13,300,000        2,198,020        (2,214)
French Franc 7/31/98                132,200,000       21,859,549         23,356
German Deutschemark 7/23/98           8,100,000        4,487,784         12,587
German Deutschemark 11/4/98             300,000          167,224          4,794
German Deutschemark 11/12/98          3,600,000        2,007,584          6,526
Japanese Yen 7/23/98                950,000,000        6,828,382        799,077
Japanese Yen 8/7/98                 883,000,000        6,346,947        453,469
Japanese Yen 10/7/98                500,000,000        3,594,283        250,628
Japanese Yen 10/21/98             3,480,000,000       25,016,732        705,022
Japanese Yen 11/4/98              2,687,000,000       19,316,469        730,133
Swedish Krona 7/10/98                12,662,000        1,584,909          (178)
Swedish Krona 8/7/98                 11,000,000        1,378,567          (190)
Swedish Krona 8/14/98                22,000,000        2,757,929         23,360
Swedish Krona 10/7/98                78,338,000        9,842,818        107,329
Swedish Krona 11/4/98                25,000,000        3,145,010        131,530
Swiss Franc 7/10/98                   1,020,000          672,114         31,820
Swiss Franc 7/17/98                   6,000,000        3,956,479        198,646
Swiss Franc 7/23/98                     500,000          329,946         16,939
Swiss Franc 10/7/98                   8,300,000        5,518,984         81,556
Swiss Franc 11/4/98                   6,000,000        4,001,334        156,670
Swiss Franc 12/2/98                  22,480,000       15,035,784        184,257
- --------------------------------------------------------------------------------
Total                                               $322,328,038    $ 1,166,055
================================================================================

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   21
<PAGE>

      JANUS ASPEN BALANCED PORTFOLIO Portfolio Manager, Blaine P. Rollins

     Janus Aspen Balanced Portfolio  returned solid results,  gaining 17.45% for
its  Institutional  Shares and 17.16% for its  Retirement  Shares during the six
months ended June 30, 1998.  The S&P 500 Index  appreciated  17.72% for the same
period,  while the Lehman Brothers  Government/Corporate  Index rose 4.17%.  All
returns include reinvested  dividends.  The average annual total returns for the
period ended June 30, 1998, follow on the next page.

U.S., Europe Gain Despite Asia's Shadow

     Asia continued to be the focus around the globe as financial distress there
caused downward pricing  pressure on worldwide  material,  commodity,  and labor
markets. Amid this turmoil, we avoided companies with broad-based Asian exposure
and  concentrated  on those with clearer  prospects in both the U.S. and Europe.
Here,   economies   prospered  from  benign  inflation  and  low  interest  rate
environments sustained by the Asian crisis.

     A diverse mix of  fixed-income  investments  provided a stable base for the
Portfolio   and   included   positions   in   Treasuries,   convertible   bonds,
investment-grade and high-yield corporate bonds, as well as preferred stocks. In
an effort to boost  income  potential,  and with  prospects  for  continued  low
interest  rates,  I lengthened  the maturity to 7-10 years. I also increased our
weighting in high-yield bonds by adding what I believe to be several  impressive
cable  issues.  My theory  is,  given the  strong  cash flow  dynamics  of these
companies,  they could potentially move toward investment-grade status, creating
opportunities for appreciation.

     My strategy for the equity portion of the Portfolio  included searching out
companies generating  significant free cash flow and reinvesting it in their own
stock, applying it toward debt, or using it to make strategic acquisitions.  The
success of this approach was most evident in our cable,  technology,  and cruise
line stocks.

Cable, Technology, and Cruise Lines Boost Results

     Standouts in the cable  industry  included  Comcast,  which has  positioned
itself as a leader in the move toward digital data, video, telephony,  and other
new  value-added  services.  MediaOne  (formerly U.S. West Media Group) and Time
Warner  also  gained,  as did  Houston  Industries,  which is one of our largest
fixed-income  positions.   This  holding,   through  a  strategic  alliance,  is
convertible  to Time  Warner  common  stock,  which,  in addition to a 4% yield,
offers considerable upside potential.

     While the technology  industry was temporarily shaken by rumblings in Asia,
many of our holdings regained ground and ended the period with noteworthy gains.
Among our top performers was Dell  Computer.  Dell builds  computers to customer
specifications, thus reducing overhead costs by eliminating the need to maintain
inventory.  This enables the company to generate  more free cash flow,  which it
frequently  reinvests  in its own  stock.  Such was the case  during  the second
quarter  when the  brief  decline  in Dell's  shares  provided  an ideal  buying
opportunity.  Cisco  Systems  also  rebounded  nicely  from the  downturn in the
technology  sector.  Rapid growth of the Internet and an  increasing  demand for
data communications hardware continue to drive this company's performance.

     Unfortunately,  semiconductors  were a segment of the  technology  industry
that did not  recover;  therefore,  I eliminated  our Intel  position at a loss.
Intel suffered from delays in a new chip rollout and increased  competition  for
its existing chips.

     Carnival  Corporation  and Royal  Caribbean  Cruises  produced  exceptional
results,  illustrating  the high demand for cruise ship vacations.  In fact, our
research indicates that 1999 reservations are on track to outpace 1998 bookings.
Merger and acquisition  activity has further  heightened our enthusiasm for this
business,  and we look for Carnival's  recent merger with the cruise line Cunard
to further accelerate its profits.

     While  the  Portfolio   posted  strong  gains,   we  did  experience   some
disappointments.  The  deterioration  of Asia's  economy,  as well as  conflicts
within OPEC,  had a negative  effect on our oil services  stocks.  Therefore,  I
eliminated these positions at a loss. Another weak performer was Charles Schwab,
which suffered from the threat of increased  competition within its industry and
from the online trading  segment.  However,  the company's  continued  growth in
assets leads me to believe the market's perception of these threats is overblown
and that the stock is just temporarily  depressed.  Therefore,  I maintained our
position in the company.

- --------------------------------------------------------------------------------
Portfolio Asset Mix                     June 30, 1998     December 31, 1997
Equities                                    45.4%               47.8%
Number of Stocks                              46                  64
Top 10 Equities                             21.6%               17.7%
Fixed-Income Securities                       39                  60
  U.S. Treasury Notes/Bonds                  9.2%               18.9%
  Investment-Grade Corp. Bonds               4.4%                8.6%
  High-Yield Corporate Bonds                20.8%                4.3%
  Foreign Corporate Bonds                     --                 0.8%
Preferred Stock                             15.7%                8.3%
Cash & Cash Equivalents                      4.5%               11.3%
- --------------------------------------------------------------------------------

Steady Economic Growth Ahead

     Moderate  economic  growth  in the U.S.  and  Europe  coupled  with  benign
inflation and low interest rates should continue to provide a positive  backdrop
for the Portfolio.  Helping to keep a lid on these factors is Asia's  unraveling
economy.  Going forward,  I'll continue to avoid companies with exposure to Asia
and  emphasize  businesses  that  should do well  despite  economic  and  market
pressures. As always, our in-depth,  hands-on research will be key in uncovering
these companies.

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

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   22
<PAGE>

      JANUS ASPEN BALANCED PORTFOLIO Portfolio Manager, Blaine P. Rollins

- --------------------------------------------------------------------------------
Average Annual Total Return(1)
For the Periods Ended June 30, 1998
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 9/13/93)
  1 Year                                          27.68%
  From Inception                                  18.41%
- --------------------------------------------------------------------------------
S&P 500 Index
  1 Year                                          30.17%
  From Inception Date of Institutional Shares     23.42%
- --------------------------------------------------------------------------------
Lehman Brothers Govt./Corp. Bond Index
  1 Year                                          11.28%
  From Inception Date of Institutional Shares      6.54%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                          27.08%
  From Inception                                  30.97%
- --------------------------------------------------------------------------------

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


            JANUS ASPEN BALANCED PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Common Stock - 45.4%
- --------------------------------------------------------------------------------
Agricultural Biotechnology - 0.5%
        54,200   Monsanto Co.                                      $   3,028,425
- --------------------------------------------------------------------------------
Airlines - 0.5%
        76,025   Ryanair Holdings PLC (ADR)*                           2,708,391
- --------------------------------------------------------------------------------
Automotive - Truck Parts and Equipment - 1.0%
        80,440   Federal-Mogul Corp.                                   5,429,700
- --------------------------------------------------------------------------------
Cable Television - 3.3%
       460,570   Comcast Corp. - Special Class A                      18,696,263
- --------------------------------------------------------------------------------
Chemicals - Diversified - 0.7%
       129,165   Solutia, Inc.                                         3,705,421
- --------------------------------------------------------------------------------
Circuits - 1.6%
       118,715   Linear Technology Corp.                               7,159,998
        90,800   SIPEX Corp.*                                          1,952,200
- --------------------------------------------------------------------------------
                                                                       9,112,198
- --------------------------------------------------------------------------------
Commercial Banks - 1.6%
        56,490   Northern Trust Corp.                                  4,307,363
        43,725   Star Banc Corp.                                       2,792,934
        27,045   U.S. Trust Corp.                                      2,062,181
- --------------------------------------------------------------------------------
                                                                       9,162,478
- --------------------------------------------------------------------------------
Commercial Services - 0.9%
        86,065   Gartner Group, Inc. - Class A*                        3,012,275
        34,825   HealthCare Financial Partners, Inc.*                  2,135,208
- --------------------------------------------------------------------------------
                                                                       5,147,483
- --------------------------------------------------------------------------------
Computer Software - 6.2%
       188,285   Cadence Design Systems, Inc.*                         5,883,906
       117,430   Microsoft Corp.                                      12,726,476
       336,300   Parametric Technology Co.*                            9,122,138
       193,850   Wind River Systems*                                   6,954,369
- --------------------------------------------------------------------------------
                                                                      34,686,889
- --------------------------------------------------------------------------------
Computers - Micro - 4.1%
       245,485   Dell Computer Corp.*                                 22,784,077
- --------------------------------------------------------------------------------
Cruise Lines - 1.5%
        75,450   Carnival Corp. - Class A                              2,989,706
        65,100   Royal Caribbean Cruises, Ltd.                         5,175,450
- --------------------------------------------------------------------------------
                                                                       8,165,156
- --------------------------------------------------------------------------------
Diversified Operations - 1.4%
       228,760   CBS Corp.                                         $   7,263,130
        31,100   Roper Industries, Inc.                                  812,487
- --------------------------------------------------------------------------------
                                                                       8,075,617
- --------------------------------------------------------------------------------
Electronic Components - Semiconductor - 1.4%
       240,555   Maxim Integrated Products, Inc.*                      7,622,587
- --------------------------------------------------------------------------------
Electronic Safety Devises - 0.2%
        16,925   Pittway Corp. - Class A                               1,250,334
- --------------------------------------------------------------------------------
Finance - Consumer Loans - 0.8%
        15,380   Beneficial Corp.                                      2,356,024
        46,860   Household International, Inc.                         2,331,285
- --------------------------------------------------------------------------------
                                                                       4,687,309
- --------------------------------------------------------------------------------
Finance - Investment Bankers/Brokers - 3.5%
       288,747   Charles Schwab Corp.                                  9,384,277
       113,785   Morgan Stanley, Dean Witter, Discover and Co.        10,397,104
- --------------------------------------------------------------------------------
                                                                      19,781,381
- --------------------------------------------------------------------------------
Finance - Other Services - 1.1%
       131,890   Newcourt Credit Group, Inc.                           6,296,099
- --------------------------------------------------------------------------------
Human Resources - 0.9%
        67,700   Robert Half International, Inc.*                      3,782,738
        49,325   Romac International, Inc.*                            1,498,247
- --------------------------------------------------------------------------------
                                                                       5,280,985
- --------------------------------------------------------------------------------
Instruments - Scientific - 1.5%
       323,660   Dionex Corp.*                                         8,536,532
- --------------------------------------------------------------------------------
Internet Software - 0.2%
         8,200   America Online, Inc.                                    869,200
- --------------------------------------------------------------------------------
Life and Health Insurance - 1.7%
        11,343   Schweizerische Lebensversicherungs-
                  und Rentenanstalt                                    9,601,995
- --------------------------------------------------------------------------------
Medical - Drugs - 1.8%
        17,120   Pfizer, Inc.                                          1,860,730
       114,600   Warner-Lambert Co.                                    7,950,375
- --------------------------------------------------------------------------------
                                                                       9,811,105
- --------------------------------------------------------------------------------
Medical - Outpatient and Home Medical Care - 0%
           376   Coram Healthcare Corp.*                                     729
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   23
<PAGE>

            JANUS ASPEN BALANCED PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Money Center Banks - 1.8%
       170,015   Bank of New York Co., Inc.                        $  10,317,785
- --------------------------------------------------------------------------------
Multimedia - 0.5%
        62,175   Meredith Corp.                                        2,918,339
- --------------------------------------------------------------------------------
Music/Clubs - 0.4%
        65,230   Steinway Musical Instruments, Inc.*                   2,103,668
- --------------------------------------------------------------------------------
Networking Products - 1.7%
       104,962   Cisco Systems, Inc.*                                  9,663,064
- --------------------------------------------------------------------------------
Power Converters and Power Supply Equipment - 0.4%
        68,125   American Power Conversion Corp.*                      2,043,750
- --------------------------------------------------------------------------------
Radio - 0.7%
        84,490   Heftel Broadcasting Corp. - Class A*                  3,780,928
- --------------------------------------------------------------------------------
Retail - Discount - 1.4%
       124,775   Costco Companies, Inc.*                               7,868,623
- --------------------------------------------------------------------------------
Retail - Regional Department Stores - 0.8%
       103,805   Fred Meyer, Inc.*                                     4,411,712
- --------------------------------------------------------------------------------
Schools - 0.5%
        76,860   Apollo Group, Inc. - Class A                          2,541,184
- --------------------------------------------------------------------------------
Television - 0.8%
       127,783   Univision Communications, Inc. - Class A*             4,759,917
- --------------------------------------------------------------------------------
Total Common Stock (cost $199,532,208)                               254,849,324
- --------------------------------------------------------------------------------
Corporate Bonds - 25.2%
- --------------------------------------------------------------------------------
Advertising Services - 0.5%
  $  2,950,000   AKI, Inc., 10.50%
                    senior notes, due 7/1/08                           2,964,750
- --------------------------------------------------------------------------------
Cable Television - 8.6%
                 Adelphia Communications Corp.:
     2,700,000      9.25%, senior notes, due 10/1/02                   2,794,500
     9,230,000      8.375%, senior notes, due 2/1/08                   9,276,150
     6,000,000   FrontierVision, 11.00%
                    senior subordinated notes, due 10/15/06            6,645,000
     5,745,000   Galaxy Telecom, L.P., 12.375%
                    senior subordinated notes, due 10/1/05             6,391,313
    11,205,000   Jones Intercable, Inc., 7.625%
                    senior notes, due 4/15/08                         11,373,075
     3,000,000   Lenfest Communications, Inc., 7.625%
                    senior notes, due 2/15/08                          3,060,000
     6,000,000   Mediacom L.L.C., 8.50%
                    senior notes, due 4/15/08+                         5,985,000
     2,505,000   Rifkin Acquisition Partners, L.P., 11.125%
                    senior subordinated notes, due 1/15/06             2,761,763
- --------------------------------------------------------------------------------
                                                                      48,286,801
- --------------------------------------------------------------------------------
Computer Software - 1.5%
     3,000,000   Aspen Technology, Inc., 5.25%
                    subordinated debenture, due 6/15/05+               3,408,750
     5,000,000   Wind River Systems, Inc., 5.00%
                    convertible subordinated notes, due 8/1/02         5,062,500
- --------------------------------------------------------------------------------
                                                                       8,471,250
- --------------------------------------------------------------------------------
Computers - Mainframe - 0.4%
     2,000,000   IBM Corp., 6.375%
                    notes, due 6/15/00                                 2,020,000
- --------------------------------------------------------------------------------
Computers - Micro - 1.4%
     7,900,000   Dell Computer Corp., 6.55%
                    senior notes, due 4/15/08                          7,998,750
- --------------------------------------------------------------------------------
Cruise Lines - 0.2%
     1,300,000   Royal Caribbean Cruises, Ltd., 7.00%
                    senior notes, due 10/15/07                         1,335,750
- --------------------------------------------------------------------------------
Distribution and Wholesale - 0.5%
     3,000,000   Aviation Sales Co., 8.125%
                    senior subordinated notes, due 2/15/08             2,932,500
- --------------------------------------------------------------------------------
Diversified Financial Services - 0.4%
  $  2,000,000   Associates Corp. of North America, 6.75%
                    senior notes, due 7/15/01                      $   2,040,000
- --------------------------------------------------------------------------------
Finance - Investment Bankers/Brokers - 0.1%
       300,000   Lehman Brothers Holdings, Inc., 6.85%
                    notes, due 10/8/99                                   303,351
       100,000   Merrill Lynch & Co., Inc., 6.375%
                    notes, due 3/30/99                                   100,417
- --------------------------------------------------------------------------------
                                                                         403,768
- --------------------------------------------------------------------------------
Multimedia - 1.9%
     8,000,000   Time Warner, Inc., 8.11%
                    notes, due 8/15/06                                 8,780,000
     2,000,000   Walt Disney Co. (The), 6.375%
                    senior notes, due 3/30/01                          2,027,500
- --------------------------------------------------------------------------------
                                                                      10,807,500
- --------------------------------------------------------------------------------
Radio - 3.4%
     8,000,000   Chancellor Media Corp., 8.125%
                    senior subordinated notes, due 12/15/07            8,080,000
    13,000,000   Jacor Communications, Inc., zero coupon
                    senior notes, due 6/12/11                         10,773,750
- --------------------------------------------------------------------------------
                                                                      18,853,750
- --------------------------------------------------------------------------------
Rental Auto/Equipment - 0.4%
     1,800,000   Ryder TRS, Inc., 10.00%
                    senior subordinated notes, due 12/1/06             2,088,000
- --------------------------------------------------------------------------------
Retail - Diversified - 1.8%
    10,000,000   Falcon Holding Group, 8.375%
                    debentures, due 4/15/10                           10,025,000
- --------------------------------------------------------------------------------
Retail - Music Store - 0.5%
     2,980,000   MTS, Inc., 9.375%
                    senior subordinated notes, due 5/1/05+             2,939,025
- --------------------------------------------------------------------------------
Retail - Regional Department Stores - 0.9%
     5,000,000   Fred Meyer, Inc., 7.45%
                    senior notes, due 3/1/08                           5,018,750
- --------------------------------------------------------------------------------
Telecommunication Services - 2.5%
    11,500,000   Level 3 Communications, Inc., 9.125%
                    senior notes, due 5/1/08                          11,183,750
     2,415,000   Qwest Communications International, Inc.,
                    10.875% senior notes, due 4/1/07                   2,798,381
- --------------------------------------------------------------------------------
                                                                      13,982,131
- --------------------------------------------------------------------------------
Television - 0.2%
     1,250,000   Sinclair Broadcast Group, Inc., 10.00%
                    senior subordinated notes, due 9/30/05             1,328,125
- --------------------------------------------------------------------------------
Total Corporate Bonds (cost $139,563,933)                            141,495,850
- --------------------------------------------------------------------------------
Preferred Stock - 15.7%
- --------------------------------------------------------------------------------
Automotive - Truck Parts and Equipment - 2.3%
       173,000   Federal-Mogul Financial Trust, 7.00%+                12,845,250
- --------------------------------------------------------------------------------
Broadcast Services and Programming - 1.7%
        45,683   TCI Pacific Communications, 5.00%                     9,636,972
- --------------------------------------------------------------------------------
Cable Television - 3.3%
       250,150   Houston Industries, Inc., 7.00%                      18,636,175
- --------------------------------------------------------------------------------
Cruise Lines - 3.1%
       138,652   Royal Caribbean Cruises, Ltd., 7.25%                 17,470,152
- --------------------------------------------------------------------------------
Radio - 1.0%
        51,918   Chancellor Media Corp., $3.00                         5,321,595
- --------------------------------------------------------------------------------
Telephone - Local - 4.3%
       270,233   MediaOne Group, Inc., 4.50%                          24,304,080
- --------------------------------------------------------------------------------
Total Preferred Stock (cost $67,045,387)                              88,214,224
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   24
<PAGE>

            JANUS ASPEN BALANCED PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
U.S. Government Obligations - 9.2%
                 U.S. Treasury Notes:
  $  8,000,000      6.50%, due 5/15/05                             $   8,442,400
       525,000      7.00%, due 7/15/06                                   573,132
    26,000,000      6.125%, due 8/15/07                               27,040,520
    15,000,000      6.625%, due 5/15/08                               15,199,050
- --------------------------------------------------------------------------------
Total U.S. Government Obligations (cost $50,579,877)                  51,255,102
- --------------------------------------------------------------------------------
U.S. Government Agency - 4.9%
                 Freddie Mac
    27,500,000      5.75%, 7/1/98
                    (amortized cost $27,500,000)                      27,500,000
- --------------------------------------------------------------------------------
Total Investments (total cost $484,221,405) - 100.4%                 563,314,500
- --------------------------------------------------------------------------------
Liabilities, net of Cash, Receivables and Other Assets - (0.4%)      (2,280,970)
- --------------------------------------------------------------------------------
Net Assets - 100%                                                  $ 561,033,530
- --------------------------------------------------------------------------------


                       Summary of Investments by Country
                                 June 30, 1998

Country                     % of Investment Securities             Market Value
- --------------------------------------------------------------------------------
Canada                                   1.1%                     $    6,296,099
Ireland                                  0.5%                          2,708,391
Switzerland                              1.7%                          9,601,995
United States++                         96.7%                        544,708,015
- --------------------------------------------------------------------------------
Total                                  100.0%                     $  563,314,500
================================================================================
++Includes Short-Term Securities (91.8% excluding Short-Term Securities)

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   25
<PAGE>

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

     Janus Aspen  Equity  Income  Portfolio  outperformed  its index  during the
period,  returning  22.61%  for its  Institutional  Shares  and  22.37%  for its
Retirement  Shares during the six months ended June 30, 1998. This compares with
a 17.72%  gain  posted by the S&P 500  Index.  All  returns  include  reinvested
dividends.  The average annual total returns for the period ended June 30, 1998,
follow on the next page.

     I  attribute  the  Portfolio's  impressive  performance  to  an  investment
strategy  that  begins with our  bottom-up,  hands-on  research.  This method of
investigating  companies  one by one  continues to turn up what we believe to be
the most compelling growth-stock and fixed-income opportunities. The result is a
Portfolio  that  pursues   long-term   capital  growth  and  current  income  by
diversifying  across  smaller,  lesser-known  companies as well as larger,  more
established businesses.

Drugs, Technology, and Cable Drive Performance

     Many  of our  top  performers  shared  several  characteristics,  including
historically  predictable  earnings,  management  teams  focused  on  increasing
shareholder  value,  strong cash flows, and improving  profitability.  Among the
industries  represented by these stocks were  pharmaceuticals,  technology,  and
cable.

     Headlines in the  drug/biotech  industry  were  dominated by the  announced
merger of American  Home  Products and  Monsanto.  As a result of this  proposed
union,  our shares in Monsanto  appreciated  nicely.  While the recent frenzy of
mergers has shown many investors that bigger companies aren't necessarily better
companies,   the   compatible   business   segments,   including   overlaps   in
pharmaceuticals  and biotechnology,  make this merger appealing.  For example, I
look for American Home's expertise in pain relievers to accelerate  future sales
of Celebra, Monsanto's new acetaminophen.  American Home also brings significant
free cash flow to the table, which is crucial to new product development.

     The  Portfolio's  performance  was also supported by  substantial  gains in
several of our technology positions.  Microsoft,  Dell Computer,  Cisco Systems,
and Wind River Systems all garnered  impressive  results after rebounding from a
temporary  downturn in this sector caused by a second round of problems in Asia.
I took  advantage of the decline by bargain  hunting for  companies  that - like
those  mentioned  above - are  capable  of growing  their top and  bottom  lines
despite a pullback in Asian demand.

     My  enthusiasm  for the cable  industry  was  rewarded by several  exciting
developments.     In    particular,     AT&T's    announced    acquisition    of
Tele-Communications,  Inc. (TCI) at a substantial  premium caused several of our
other  cable  holdings  to  appreciate  considerably.  These  included  MediaOne
(formerly  U.S.  West  Media  Group)  and  Comcast - both new  additions  to the
Portfolio - and our preferred stock position in Houston  Industries.  I view the
AT&T/TCI merger as a turning point in this industry as companies join forces and
technologies  to carry new value-added  services,  such as telephony and digital
cable, into subscribers' homes through the cable pipeline.

- --------------------------------------------------------------------------------
Portfolio Asset Mix                     June 30, 1998     December 31, 1997
Equities                                    68.9%               74.7%
Number of Stocks                              41                  69
Top 10 Equities                             31.4%               28.5%
Fixed-Income Securities
  Investment-Grade Corp. Bonds               6.0%                7.9%
  High-Yield Corporate Bonds                 3.1%                 --
  Preferred Stock                           21.5%                6.2%
Cash & Cash Equivalents                      0.5%               11.2%
- --------------------------------------------------------------------------------

Positive Outlook for Radio Stocks

     I consider radio to be a promising industry and took the opportunity to add
to our weighting in this sector during a slight downturn.  New positions include
Jacor Communications convertible bonds and Chancellor Media preferred stock. I'm
increasingly  optimistic  as radio  continues to take a  considerable  amount of
advertising share away from television and other more costly media segments.  As
a result, I anticipate strong future results from these positions.

     Despite the Portfolio's impressive performance, certain stocks did not meet
my expectations.  Intel declined amid a slowdown in the  semiconductor  industry
and delays in the  company's  plans to roll out a new chip.  With its  prospects
dimmed,  I sold the position at a loss.  Our oil services  companies  languished
because of a decline in Asian  demand,  conflicts  within OPEC,  and the warmest
winter on record.  These holdings,  as well, were eliminated at a loss.  Charles
Schwab was another  disappointment.  This discount brokerage firm's results were
hindered by increased  competition and the growing popularity of online trading.
I opted to maintain this position,  however,  because of the company's continued
growth in assets and solid business fundamentals.

All Eyes Still on Asia

     My outlook for the economy is both  optimistic and cautious.  I continue to
closely monitor the Asian crisis,  especially  after its reemergence  during the
period.  Yet, I believe this  situation  should help keep global  inflation  and
interest rates in check,  providing a healthy  environment for economic  growth,
particularly in the U.S. and Europe.  Going forward, our goal is to fulfill your
expectations  by investing in  companies we believe will prosper  regardless  of
economic events. I'm confident our exceptional research capabilities will enable
us to keep doing so.

     In closing,  I'd like to express my  appreciation  for your  investment  in
Janus Aspen Equity Income Portfolio.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   26
<PAGE>

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

- --------------------------------------------------------------------------------
Average Annual Total Return(1)
For the Periods Ended June 30, 1998
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 5/1/97)
  1 Year                                          41.88%
  From Inception                                  53.73%
- --------------------------------------------------------------------------------
S&P 500 Index
  1 Year                                          30.17%
  From Inception Date of Institutional Shares     36.91%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                          41.21%
  From Inception                                  52.99%
- --------------------------------------------------------------------------------

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


          JANUS ASPEN EQUITY INCOME PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Common Stock - 68.9%
- --------------------------------------------------------------------------------
Agricultural Biotechnology - 1.2%
         1,225   Monsanto Co.                                      $      68,447
- --------------------------------------------------------------------------------
Airlines - 1.6%
         2,600   Ryanair Holdings PLC (ADR)*                              92,625
- --------------------------------------------------------------------------------
Automotive - Trucks Parts and Equipment - 1.4%
         1,225   Federal-Mogul Corp.                                      82,687
- --------------------------------------------------------------------------------
Cable Television - 4.5%
         6,237   Comcast Corp. - Special Class A                         253,183
           111   Tele-Communications, Inc. - Class A*                      4,267
- --------------------------------------------------------------------------------
                                                                         257,450
- --------------------------------------------------------------------------------
Chemicals - Diversified - 0.8%
         1,675   Solutia, Inc.                                            48,052
- --------------------------------------------------------------------------------
Circuits - 3.1%
         2,070   Linear Technology Corp.                                 124,847
         2,570   SIPEX Corp.*                                             55,255
- --------------------------------------------------------------------------------
                                                                         180,102
- --------------------------------------------------------------------------------
Commercial Banks - 3.1%
           105   M & T Bank Corp.                                         58,170
           575   Northern Trust Corp.                                     43,844
           575   Star Banc Corp.                                          36,728
           555   U.S. Trust Corp.                                         42,319
- --------------------------------------------------------------------------------
                                                                         181,061
- --------------------------------------------------------------------------------
Commercial Services - 0.8%
         1,335   Gartner Group, Inc. - Class A*                           46,725
- --------------------------------------------------------------------------------
Computer Software - 9.6%
         3,880   Cadence Design Systems, Inc.*                           121,250
         1,960   Microsoft Corp.*                                        212,415
         2,710   Parametric Technology Co.*                               73,509
         4,200   Wind River Systems*                                     150,675
- --------------------------------------------------------------------------------
                                                                         557,849
- --------------------------------------------------------------------------------
Computers - Micro - 5.2%
         3,255   Dell Computer Corp.*                                    302,105
- --------------------------------------------------------------------------------
Cruise Lines - 2.0%
           730   Carnival Corp. - Class A                          $      28,926
         1,084   Royal Caribbean Cruises, Ltd.                            86,178
- --------------------------------------------------------------------------------
                                                                         115,104
- --------------------------------------------------------------------------------
Diversified Operations - 2.0%
         3,640   CBS Corp.                                               115,570
- --------------------------------------------------------------------------------
Electronic Components - Semiconductors - 2.3%
         4,290   Maxim Integrated Products, Inc.*                        135,939
- --------------------------------------------------------------------------------
Finance - Consumer Loans - 1.2%
           155   Beneficial Corp.                                         23,744
           870   Household International, Inc.                            43,282
- --------------------------------------------------------------------------------
                                                                          67,026
- --------------------------------------------------------------------------------
Finance - Investment Bankers/Brokers - 4.8%
         4,505   Charles Schwab Corp.                                    146,412
         1,415   Morgan Stanley, Dean Witter, Discover and Co.           129,296
- --------------------------------------------------------------------------------
                                                                         275,708
- --------------------------------------------------------------------------------
Finance - Other Services - 1.3%
         1,520   Newcourt Credit Group, Inc.                              72,561
- --------------------------------------------------------------------------------
Human Resources - 2.0%
           900   Robert Half International, Inc.*                         50,288
         2,225   Romac International, Inc.*                               67,584
- --------------------------------------------------------------------------------
                                                                         117,872
- --------------------------------------------------------------------------------
Instruments - Scientific - 2.6%
         5,655   Dionex Corp.*                                           149,151
- --------------------------------------------------------------------------------
Life and Health Insurance - 2.2%
           153   Schweizerische Lebensversicherungs-
                  und Rentenanstalt                                      129,516
- --------------------------------------------------------------------------------
Medical - Drugs - 1.8%
         1,500   Warner-Lambert Co.                                      104,062
- --------------------------------------------------------------------------------
Money Center Banks - 4.6%
         2,405   Bank of New York Co., Inc.                              145,953
           325   UBS A.G.                                                120,846
- --------------------------------------------------------------------------------
                                                                         266,799
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   27
<PAGE>

          JANUS ASPEN EQUITY INCOME PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Multimedia - 0.5%
           650   Meredith Corp.                                    $      30,509
- --------------------------------------------------------------------------------
Music/Clubs - 0.2%
           280   Steinway Musical Instruments, Inc.*                       9,030
- --------------------------------------------------------------------------------
Networking Products - 2.9%
         1,837   Cisco Systems, Inc.*                                    169,119
- --------------------------------------------------------------------------------
Radio - 1.5%
         1,890   Heftel Broadcasting Corp. - Class A*                     84,578
- --------------------------------------------------------------------------------
Retail - Discount - 1.8%
         1,670   Costco Companies, Inc.*                                 105,314
- --------------------------------------------------------------------------------
Retail - Regional Department Stores - 1.2%
         1,690   Fred Meyer, Inc.*                                        71,825
- --------------------------------------------------------------------------------
Television - 2.7%
         4,122   Univision Communications, Inc. - Class A*               153,545
- --------------------------------------------------------------------------------
Total Common Stock (total cost $3,316,589)                             3,990,331
- --------------------------------------------------------------------------------
Corporate Bonds - 9.1%
- --------------------------------------------------------------------------------
Computer Software - 3.2%
  $    185,000   Wind River Systems, Inc., 5.00%
                    convertible subordinated notes, due 8/1/02           187,313
- --------------------------------------------------------------------------------
Drug Delivery Systems - 2.8%
       125,000   ALZA Corp., 5.00%
                    subordinated debentures, due 5/1/06                  158,750
- --------------------------------------------------------------------------------
Radio - 3.1%
       220,000   Jacor Communications, Inc., zero coupon
                    senior notes, due 6/12/11                            182,325
- --------------------------------------------------------------------------------
Total Corporate Bonds (cost $515,219)                                    528,388
- --------------------------------------------------------------------------------
Preferred Stock - 21.5%
- --------------------------------------------------------------------------------
Automotive - Truck Parts and Equipment - 2.6%
         2,000   Federal-Mogul Financial Trust, 7.00%+                   148,500
- --------------------------------------------------------------------------------
Broadcast Services and Programming - 1.8%
           500   TCI Pacific Communications, 5.00%                       105,477
- --------------------------------------------------------------------------------
Cable Television - 4.7%
         3,675   Houston Industries, Inc., 7.00%                         273,787
- --------------------------------------------------------------------------------
Cruise Lines - 5.9%
         2,700   Royal Caribbean Cruises, Ltd., 7.25%                    340,200
- --------------------------------------------------------------------------------
Radio - 2.0%
         1,100   Chancellor Media Corp., $3.00                           112,750
- --------------------------------------------------------------------------------
Telephone - Local - 4.5%
         2,910   MediaOne Group, Inc. 4.50%                              261,718
- --------------------------------------------------------------------------------
Total Preferred Stock (cost $991,972)                                  1,242,432
- --------------------------------------------------------------------------------
Total Investments (total cost $4,823,780) - 99.5%                      5,761,151
- --------------------------------------------------------------------------------
Cash, Receivables and Other Assets, net of Liabilities - 0.5%             27,649
- --------------------------------------------------------------------------------
Net Assets - 100%                                                  $   5,788,800
- --------------------------------------------------------------------------------


                       Summary of Investments by Country
                                 June 30, 1998

Country                    % of Investment Securities              Market Value
- --------------------------------------------------------------------------------
Canada                                   1.3%                     $       72,561
Ireland                                  1.6%                             92,625
Switzerland                              4.3%                            250,362
United States                           92.8%                          5,345,603
- --------------------------------------------------------------------------------
Total                                  100.0%                     $    5,761,151
================================================================================

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   28
<PAGE>

  JANUS ASPEN GROWTH AND INCOME PORTFOLIO Portfolio Manager, David J. Corkins

     Janus Aspen Growth and Income Portfolio opened on May 1, 1998. Before going
into detail about its performance,  I'd like to thank you for your investment in
this new  Portfolio  and assure you of my  commitment  to pursue the results you
expect.

     We posted  solid  gains in our first two  months,  returning  5.60% for the
Institutional  Shares  during the period ended June 30, 1998,  and 5.50% for the
Retirement  Shares.  In comparison,  the S&P 500 Index  appreciated  2.27%.  All
returns  include  reinvested  dividends.  The  cumulative  total returns for the
period ended June 30, 1998, follow on the next page.

     The Portfolio opened during a time of considerable volatility as the market
reacted to worries  about new problems in Asia and the potential for an economic
slowdown.  Ironically, this period was preceded by concerns in the first quarter
regarding  an  overzealous  U.S.  economy.  I've  taken  steps to  position  the
Portfolio so that I believe it should perform regardless of economic changes.

An Opportunistic Strategy

     I look to invest in great companies that often have three things in common:
strong management, a good business, and predictable earnings. I try to add value
by finding a catalyst  that  others  might miss.  Primarily,  I invest in common
stocks and use their  dividends  for income.  To manage  risk,  I also invest in
preferred  stocks for higher yields and lower  volatility.  At times,  I include
smaller positions in foreign  securities and fixed-income  instruments if market
conditions are appropriate.

     Since the Portfolio's  inception,  I've added positions in approximately 60
stocks,  with  core  weightings  in  media/entertainment,   financial  services,
pharmaceuticals,  and technology.  I believe these industries have bright future
economics,  and, within them, I seek companies with top-flight  management teams
focused on  increasing  shareholder  value.  At the same time,  I steer clear of
businesses that are capital-intensive because of the limits this places on their
free cash flow.

- --------------------------------------------------------------------------------
Portfolio Asset Mix                     June 30, 1998
Equities                                    90.3%
Number of Stocks                              70
Top 10 Equities                             26.0%
Fixed-Income Securities                      1.4%
Cash & Cash Equivalents                      8.3%
- --------------------------------------------------------------------------------

Industry Consolidation Emerges as a Theme

     During the period,  we witnessed several strategic mergers across a variety
of industries,  starting with cable. I'm positive on the cable companies because
they are becoming less capital-intensive,  their distribution capabilities are a
powerful force, and new,  value-added  services,  such as data, video, and voice
offer higher  profit  margins.  The  subsequent  AT&T/Tele-Communications,  Inc.
merger  highlighted  these facts. As cable  companies  continue to gain critical
mass in individual markets, I believe this industry will consolidate further.

     Two of our  pharmaceutical  holdings swept up in merger mania were American
Home Products and Monsanto. Their combined research,  development, and marketing
budgets  should  help  build  what  I  believe  will  be  a  powerhouse  in  the
pharmaceutical,  nutrition,  and  agriculture  industries.  Other drug  stocks I
remain  optimistic  about  include  Warner-Lambert,  Pfizer,  and  Bristol-Myers
Squibb, all of which posted solid results during the period.

     Another sector that did well for the Portfolio was financial services.  The
entire  landscape of this  industry  appears to be undergoing  dramatic  change,
fueled, again, by consolidation. Among the many recent acquisition announcements
was  NationsBank's  proposal to buy BankAmerica,  which is a sizable position in
the  Portfolio.   I'm  confident  the  new  company  will  have  the  preeminent
distribution platform in its industry from which a variety of financial services
will eventually be sold.

     Although  the  Portfolio   performed  well  overall,  it  was  not  without
disappointments,  including CBS Corp. Although there were no fundamental reasons
for this stock to underperform, I suspect it was bruised by concerns regarding a
potential   weakening  in  advertising   sales.  This  was  likely  fostered  by
speculation about an economic slowdown. However,  second-quarter results for CBS
were better than expected; therefore, I held on to this position and look for it
to continue gaining strength.

Asia Keeps Global Economies in Check

     Going forward, I don't expect the ride to get any smoother.  Companies with
significant  Asian  exposure will likely see their  earnings  squeezed,  and the
strong dollar could slow the pace of U.S.  economic  growth.  Additionally,  the
economic  slowdown in Asia  appears to have reduced the recent heady pace of the
U.S.  expansion  and has helped  keep  global  commodity  prices in check.  With
technological   innovation  and  productivity   gains  helping  to  offset  wage
pressures,  the risks of inflation  seem  negligible,  and interest rates remain
low.

     In terms  of the  Portfolio,  I  remain  confident  in the  quality  of our
companies,  and our research continues to uncover exciting new ideas. I continue
to look hard at each and every stock,  weighing the fundamentals and sticking by
companies  with  strong  management,  a  compelling  business,  and  predictable
earnings.

     Thank  you again for your  investment  in Janus  Aspen  Growth  and  Income
Portfolio.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   29
<PAGE>

  JANUS ASPEN GROWTH AND INCOME PORTFOLIO Portfolio Manager, David J. Corkins

- --------------------------------------------------------------------------------
Cumulative Total Return(1)
For the Periods Ended June 30, 1998
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 5/1/98)
  From Inception                                   5.60%
- --------------------------------------------------------------------------------
S&P 500 Index
  From Inception Date of Institutional Shares      2.27%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/98)
  From Inception                                   5.50%
- --------------------------------------------------------------------------------

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


       JANUS ASPEN GROWTH AND INCOME PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Common Stock - 84.4%
- --------------------------------------------------------------------------------
Advertising Sales - 1.3%
           787   Outdoor Systems, Inc.*                            $      22,036
- --------------------------------------------------------------------------------
Agricultural Biotechnology - 0.8%
           235   Monsanto Co.                                             13,130
- --------------------------------------------------------------------------------
Agricultural Operations - 0.8%
           300   Delta and Pine Land Co.                                  13,350
- --------------------------------------------------------------------------------
Airlines - 0.9%
           200   UAL Corp.*                                               15,600
- --------------------------------------------------------------------------------
Automotive - Cars and Light Trucks - 2.4%
           485   Ford Motor Co.                                           28,615
           221   Renault S.A.                                             12,570
- --------------------------------------------------------------------------------
                                                                          41,185
- --------------------------------------------------------------------------------
Beverages - Non-Alcoholic - 1.4%
           600   Coca-Cola Enterprises, Inc.                              23,550
- --------------------------------------------------------------------------------
Broadcast Services and Programming - 0.9%
           400   Tele-Communications Liberty Media
                  Group, Inc., - Class A*                                 15,525
- --------------------------------------------------------------------------------
Cable Television - 7.4%
         1,195   Comcast Corp. - Special Class A                          48,509
           450   Cox Communications, Inc. - Class A*                      21,797
           500   MediaOne Group, Inc.*                                    21,968
           865   Tele-Communications, Inc. - Class A*                     33,248
- --------------------------------------------------------------------------------
                                                                         125,522
- --------------------------------------------------------------------------------
Cellular Telecommunications - 0.9%
         2,165   Telecom Italia S.p.A.                                    15,818
- --------------------------------------------------------------------------------
Chemicals - Diversified - 3.4%
           365   E.I. du Pont de Nemours and Co.                          27,238
           125   Imperial Chemical Industries PLC (ADR)                    8,062
           800   Solutia, Inc.                                            22,950
- --------------------------------------------------------------------------------
                                                                          58,250
- --------------------------------------------------------------------------------
Chemicals - Specialty - 0.5%
           210   Cytec Industries, Inc.*                                   9,292
- --------------------------------------------------------------------------------
Commercial Banks - 1.3%
           345   Star Banc Corp.                                          22,036
- --------------------------------------------------------------------------------
Computer Software - 5.2%
           880   Cadence Design Systems, Inc.*                     $      27,500
           400   Microsoft Corp.*                                         43,350
           650   Parametric Technology Co.*                               17,631
- --------------------------------------------------------------------------------
                                                                          88,481
- --------------------------------------------------------------------------------
Computers - Micro - 2.7%
           500   Dell Computer Corp.*                                     46,406
- --------------------------------------------------------------------------------
Cruise Lines - 2.7%
           250   Carnival Corp. - Class A                                  9,906
           450   Royal Caribbean Cruises, Ltd.                            35,775
- --------------------------------------------------------------------------------
                                                                          45,681
- --------------------------------------------------------------------------------
Diversified Financial Services - 1.6%
           350   Associates First Capital Corp. - Class A                 26,906
- --------------------------------------------------------------------------------
Diversified Operations - 7.8%
         1,300   CBS Corp.                                                41,275
           500   General Electric Co.                                     45,500
           255   Textron, Inc.                                            18,280
           450   Tyco International, Ltd.                                 28,350
- --------------------------------------------------------------------------------
                                                                         133,405
- --------------------------------------------------------------------------------
Electronic Components - Semiconductors - 1.7%
           250   Applied Materials, Inc.                                   7,375
            80   Intel Corp.                                               5,930
           500   Maxim Integrated Products, Inc.                          15,843
- --------------------------------------------------------------------------------
                                                                          29,148
- --------------------------------------------------------------------------------
Finance - Consumer Loans - 2.5%
           865   Household International, Inc.                            43,034
- --------------------------------------------------------------------------------
Finance - Investment Bankers/Brokers - 3.1%
           500   Charles Schwab Corp.                                     16,250
            75   Merrill Lynch & Co., Inc.                                 6,919
           315   Morgan Stanley, Dean Witter, Discover and Co.            28,783
- --------------------------------------------------------------------------------
                                                                          51,952
- --------------------------------------------------------------------------------
Finance - Mortgage Loan Banker - 0.9%
           250   Fannie Mae                                               15,188
- --------------------------------------------------------------------------------
Finance - Other Services - 2.3%
           775   Newcourt Credit Group, Inc. - New York Shares            38,120
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   30
<PAGE>

       JANUS ASPEN GROWTH AND INCOME PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Internet Content - 0.1%
            40   At Home Corp. - Class A*                          $       1,893
- --------------------------------------------------------------------------------
Internet Software - 1.3%
           200   America Online, Inc.                                     21,200
- --------------------------------------------------------------------------------
Investment Management and Advisory Services- 0.7%
           500   Waddell & Reed Financial, Inc. - Class A                 11,969
- --------------------------------------------------------------------------------
Medical - Drugs - 9.7%
           145   American Home Products Corp.                              7,504
           729   Astra A.B. - Class A                                     14,900
           250   Bristol-Myers Squibb Co.                                 28,734
           300   Eli Lilly and Co.                                        19,819
           350   Pfizer, Inc.                                             38,041
           400   Pharmacia & Upjohn, Inc.                                 18,450
           550   Warner-Lambert Co.                                       38,156
- --------------------------------------------------------------------------------
                                                                         165,604
- --------------------------------------------------------------------------------
Money Center Banks - 4.1%
           500   BankAmerica Corp.                                        43,219
           175   Citicorp                                                 26,119
- --------------------------------------------------------------------------------
                                                                          69,338
- --------------------------------------------------------------------------------
Multimedia - 3.2%
           550   Time Warner, Inc.                                        46,991
            70   Walt Disney Co. (The)                                     7,354
- --------------------------------------------------------------------------------
                                                                          54,345
- --------------------------------------------------------------------------------
Networking Products - 2.7%
           505   Cisco Systems, Inc.*                                     46,492
- --------------------------------------------------------------------------------
Pharmacy Services - 0.7%
           300   Omnicare, Inc.                                           11,438
- --------------------------------------------------------------------------------
Property and Casualty Insurance - 0.6%
           200   Allied Group, Inc.                                        9,363
- --------------------------------------------------------------------------------
Radio - 0.9%
           100   Chancellor Media Corp.*                                   4,966
           225   Heftel Broadcasting Corp. - Class A*                     10,069
- --------------------------------------------------------------------------------
                                                                          15,035
- --------------------------------------------------------------------------------
Retail - Discount - 1.3%
           360   Costco Companies, Inc.*                                  22,703
- --------------------------------------------------------------------------------
Retail - Regional Department Stores - 1.1%
           450   Fred Meyer, Inc.*                                        19,125
- --------------------------------------------------------------------------------
Super - Regional Banks - 2.6%
           100   Mellon Bank Corp.                                         6,963
           875   U.S. Bancorp                                             37,625
- --------------------------------------------------------------------------------
                                                                          44,588
- --------------------------------------------------------------------------------
Telecommunication Equipment - 0.5%
           100   Lucent Technologies, Inc.                                 8,319
- --------------------------------------------------------------------------------
Telecommunication Services - 0.4%
           450   Hyperion Telecommunications, Inc. - Class A*              7,059
- --------------------------------------------------------------------------------
Telephone - Long Distance - 2.0%
           695   WorldCom, Inc.*                                          33,664
- --------------------------------------------------------------------------------
Total Common Stock (cost $1,365,527)                                   1,435,750
- --------------------------------------------------------------------------------
Corporate Bonds - 1.4%
- --------------------------------------------------------------------------------
Cable Television - 0.1%
  $      1,000   Mediacom L.L.C., 8.50%
                    senior notes, due 4/15/08+                               998
- --------------------------------------------------------------------------------
Distributions and Wholesale - 0.4%
         8,000   Aviation Sales Co., 8.125%
                    senior subordinated notes, due 2/15/08                 7,820
- --------------------------------------------------------------------------------
Retail - Leisure Products - 0.3%
         5,000   Selmer Co., Inc., 11.00%
                    senior subordinated notes, due 5/15/05                 5,438
- --------------------------------------------------------------------------------
Retail - Regional Department Stores - 0.4%
  $      7,000   Fred Meyer, Inc., 7.45%
                    senior notes, due 3/1/08                       $       7,026
- --------------------------------------------------------------------------------
Telecommunication Services - 0.2%
         3,000   Level 3 Communications, Inc., 9.125%
                    senior notes, due 5/1/08                               2,918
- --------------------------------------------------------------------------------
Total Corporate Bonds (cost $24,157)                                      24,200
- --------------------------------------------------------------------------------
Preferred Stock - 5.9%
- --------------------------------------------------------------------------------
Automotive - Cars and Light Trucks - 0.2%
             1   Porsche A.G.                                              2,881
- --------------------------------------------------------------------------------
Automotive - Truck Parts and Equipment - 2.7%
           628   Federal-Mogul Financial Trust, 7.00%+                    46,629
- --------------------------------------------------------------------------------
Broadcast Services and Programming - 0.2%
            17   TCI Pacific Communications, 5.00%                         3,586
- --------------------------------------------------------------------------------
Cable Television - 0.4%
            98   Houston Industries, Inc., 7.00%                           7,301
- --------------------------------------------------------------------------------
Radio - 1.0%
           165   Chancellor Media Corp., $3.00                            16,913
- --------------------------------------------------------------------------------
Telephone - Local - 1.4%
           265   MediaOne Group, Inc., 4.50%                              23,833
- --------------------------------------------------------------------------------
Total Preferred Stock (cost $93,813)                                     101,143
- --------------------------------------------------------------------------------
U.S. Government Agency - 11.8%
                 Fannie Mae
  $    200,000      5.85%, 7/1/98 (amortized cost $200,000)              200,000
- --------------------------------------------------------------------------------
Total Investments (total cost $1,683,497) - 103.5%                     1,761,093
- --------------------------------------------------------------------------------
Liabilities, net of Cash, Receivables and Other Assets - (3.5%)         (59,338)
- --------------------------------------------------------------------------------
Net Assets - 100%                                                  $   1,701,755
- --------------------------------------------------------------------------------


                       Summary of Investments by Country
                                 June 30, 1998

Country                     % of Investment Securities             Market Value
- --------------------------------------------------------------------------------
Canada                                   2.2%                     $       38,120
Germany                                  0.2%                              2,881
France                                   0.7%                             12,570
Italy                                    0.9%                             15,818
Sweden                                   0.8%                             14,900
United Kingdom                           0.5%                              8,063
United States++                         94.7%                          1,668,741
- --------------------------------------------------------------------------------
Total                                  100.0%                     $    1,761,093
================================================================================
++Includes Short-Term Securities (83.4% excluding Short-Term Securities)

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   31
<PAGE>

   JANUS ASPEN FLEXIBLE INCOME PORTFOLIO Portfolio Manager, Ronald V. Speaker

     During the six months  ended June 30,  1998,  Janus Aspen  Flexible  Income
Portfolio  outperformed  the Lehman  Brothers  Government/Corporate  Bond Index,
returning  5.57% for its  Institutional  Shares  and  5.32%  for its  Retirement
Shares.  This compares with a gain of 4.17% for the Index.  All returns  include
reinvested dividends. The average annual total returns for the period ended June
30, 1998, follow on the next page.

Events Divide Period as Volatility Persists

     During the first half of the year, the bond market transitioned through two
distinct periods.  Initially,  the U.S. economy continued to grow,  unemployment
declined,  and the stock market soared.  And although  interest rates were level
throughout the first quarter, the magnitude of economic growth produced fears of
a rate increase. At the same time, because the Asian crisis appeared to have had
a minimal  effect on the U.S.  economy,  concerns  about the Far East  seemed to
fade.

     The tide  changed  in the  second  quarter  as  "chapter  two" of the Asian
financial  crisis began to unfold with several  larger  multinational  companies
releasing  earnings  warnings.  However,  the reemergence of problems in the Far
East  allowed the  Federal  Reserve  Board to hold the line on raising  interest
rates,  despite  its  earlier  warnings of an  increase.  Additionally,  a sharp
decline in the yen renewed worries of further currency  devaluations  throughout
Asia and prompted a flight to U.S.  Treasuries.  The resulting influx of capital
allowed domestic interest rates to trend considerably lower.

Diversification Key to Success

     Despite the volatile  environment,  I held true to my investment discipline
and pursued a diversified  approach.  While the Portfolio continued to invest in
Treasuries  and  maintained a  substantial  weighting  in  high-yield  bonds,  I
reallocated some of these assets to  investment-grade  corporate bonds.  Through
this flexible mix, and as interest  rates declined and bond prices rose, we were
able to maximize yield, diversify risk, and generate significant capital gains.

     Our biggest winner during the first half was U.S.  Surgical.  After reading
U.S. Surgical's prospectus and listening to a conference call with the company's
management  team, many investors  bought this bond, which at that time possessed
both high-yield and investment-grade characteristics.  However, I was interested
in  learning  more  about  the  company  and  consequently  visited  one  of its
subsidiaries.  While touring the factory, I noticed performance  charts,  posted
for the benefit of employees,  that revealed the company was currently exceeding
management's expectations. This confirmation of U.S. Surgical's success aided in
my decision to invest in this bond.  Since then, we've benefited from the bond's
improved quality, resulting from its merger with Tyco International, which has a
higher credit rating than U.S. Surgical.

     Another development that benefited the Portfolio was the merger of AT&T and
Tele-Communications,  Inc.,  one of our largest  positions in the corporate bond
arena. I believe this union has caused  investors to  acknowledge  the prospects
for cash flow growth in the cable industry and the expanding  opportunities  for
providing new value-added services through a single coaxial cable.

     On the  high-yield  front,  several  new names were added  helping to boost
income and capital appreciation. These include Bally Total Fitness, the nation's
largest owner of fitness  centers,  and Jones  Intercable,  which  increased our
exposure to the cable industry.  Also new to our high-yield  position was Magnum
Hunter Resources,  an oil and gas exploration and production  company whose bond
we purchased because of the company's solid acquisition prospects.

     Although I was generally pleased with the Portfolio's  results,  not all of
our ideas contributed to its strong performance.  Metricom,  a convertible bond,
tested my patience  despite the fact that the  company has  patented  technology
that provides  computers  with a wireless  connection  to the  Internet,  and is
currently  testing a faster  modem that will run at ISDN line  speeds.  Although
this bond  recently  experienced  some  volatility,  I'm holding the position in
anticipation  of a successful  introduction  and  acceptance  of the system next
year.

- --------------------------------------------------------------------------------
Portfolio Asset Mix                     June 30, 1998     December 31, 1997
Investment-Grade Corporate Bonds            33.6%               26.9%
High-Yield/High-Risk Bonds                  37.6%               39.9%
U.S. Government Obligations                 15.4%               20.9%
Preferred Stock                              1.0%                0.6%
Cash & Cash Equivalents                     12.4%               11.7%
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
Portfolio Profile
Weighted Average Maturity                 9.4 Yrs.            9.2 Yrs.
Average Modified Duration*                5.8 Yrs.            5.8 Yrs.
30-Day Average Yield
  Institutional Shares**                    6.87%               6.85%
  Retirement Shares**                       6.32%               6.32%
Average Rating                              BBB-                BBB+
- --------------------------------------------------------------------------------
*A theoretical measure of price volatility.
**Yields will fluctuate.

Potential For a Slowing Economy

     Currently,  the bond market is evaluating  whether the robust U.S. economic
expansion  can continue  into the  foreseeable  future.  I believe that economic
growth will slow from its torrid pace during the first half of the year  because
of renewed  problems in Asia,  concerns  regarding  corporate  profits,  and the
effects  of the  General  Motors  strike.  However,  I'm  confident  our  strong
weightings  in  investment-grade  bonds will prove  beneficial  in the event the
economy does weaken.  Going forward, I plan to maintain our diversified approach
and to take  advantage of  potential  opportunities,  wherever  they may present
themselves.

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

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   32
<PAGE>

   JANUS ASPEN FLEXIBLE INCOME PORTFOLIO Portfolio Manager, Ronald V. Speaker

- --------------------------------------------------------------------------------
Average Annual Total Return(1)
For the Periods Ended June 30, 1998
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 9/13/93)
  1 Year                                          13.07%
  From Inception                                  10.20%
- --------------------------------------------------------------------------------
Lehman Brothers Govt./Corp. Bond Index
  1 Year                                          11.28%
  From Inception Date of Institutional Shares      6.54%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                          12.42%
  From Inception                                  13.20%
- --------------------------------------------------------------------------------

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


        JANUS ASPEN FLEXIBLE INCOME PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Corporate Bonds - 71.1%
- --------------------------------------------------------------------------------
Automotive - Cars and Light Trucks - 1.3%
  $  1,000,000   Ford Motor Co., 7.25%
                    notes, due 10/1/08                             $   1,075,000
- --------------------------------------------------------------------------------
Beverages - Non-Alcoholic - 1.9%
     1,500,000   Coca-Cola Enterprises, Inc., 6.95%
                    debentures, due 11/15/26                           1,561,875
- --------------------------------------------------------------------------------
Broadcast Services and Programming - 0.6%
       500,000      Fox/Liberty Networks L.L.C., 8.875%
                    senior notes, due 8/15/07                            506,250
- --------------------------------------------------------------------------------
Cable Television - 3.7%
       500,000   Century Communications Corp., 8.375%
                    senior notes, due 12/15/07                           515,000
       500,000   Galaxy Telecom, L.P., 12.375%
                    senior subordinated notes, due 10/1/05               556,250
       500,000   Jones Intercable, Inc., 7.625%
                    senior notes, due 4/15/08                            507,500
       500,000   Supercanal Holdings S.A., 11.50%
                    senior notes, due 5/15/05+                           477,500
     1,000,000   TCI Communications, Inc., 6.875%
                    senior notes, due 2/15/06                          1,032,500
- --------------------------------------------------------------------------------
                                                                       3,088,750
- --------------------------------------------------------------------------------
Casino Hotels - 0.9%
       750,000   Venetian Casino Resort L.L.C., 12.25%
                    company guaranteed notes, due 11/15/04               774,375
- --------------------------------------------------------------------------------
Casino Services - 0.6%
       500,000   Isle of Capri Black Hawk, L.L.C., 13.00%
                    first mortgage bonds, due 8/31/04                    527,500
- --------------------------------------------------------------------------------
Cellular Telecommunications - 2.6%
     1,250,000   360 Communications Co., 6.65%
                    notes, due 1/15/08                                 1,262,500
       870,000   American Cellular Corp., 10.50%
                    senior notes, due 5/15/08+                           865,650
- --------------------------------------------------------------------------------
                                                                       2,128,150
- --------------------------------------------------------------------------------
Chemicals - Specialty - 0.5%
       350,000   Praxair, Inc., 6.625%
                    notes, due 10/15/07                                  356,125
- --------------------------------------------------------------------------------
Commercial Banks - 7.1%
  $  1,000,000   Bank One Texas, 6.25%
                    subordinated notes, due 2/15/08                $     995,000
     1,250,000   BankBoston N.A., 6.375%
                    subordinated notes, due 3/25/08                    1,250,000
       735,000   First Nationwide Holdings, Inc., 10.625%
                    senior subordinated notes, due 10/1/03               832,388
       700,000   HUBCO, Inc., 8.20%
                    subordinated debentures, due 9/15/06                 764,750
     1,000,000   NationsBank Corp., 6.60%
                    subordinated notes, due 5/15/10                    1,022,500
     1,000,000   Provident Trust I, 8.29%
                    company guaranteed notes, due 4/15/28              1,051,250
- --------------------------------------------------------------------------------
                                                                       5,915,888
- --------------------------------------------------------------------------------
Computers - Integrated Systems - 0.6%
       500,000   Candescent Technologies Corp., 7.00%
                    senior subordinated debentures, due 5/1/03           500,000
- --------------------------------------------------------------------------------
Computers - Mainframe - 1.9%
                 IBM Corp.:
       500,000      6.45% notes, due 8/1/07                              513,750
     1,000,000      7.00% debentures, due 10/30/25                     1,068,750
- --------------------------------------------------------------------------------
                                                                       1,582,500
- --------------------------------------------------------------------------------
Consumer Products - 0.4%
       450,000   Spin Cycle, Inc., zero coupon
                    units, due 5/1/05+                                   321,750
- --------------------------------------------------------------------------------
Containers - Metal and Glass - 0.6%
       500,000   Crown Cork & Seal Co., Inc., 7.00%
                    company guaranteed notes, due 12/15/06               518,125
- --------------------------------------------------------------------------------
Distribution and Wholesale - 0.5%
       445,000   Aviation Sales Co., 8.125%
                    senior subordinated notes, due 2/15/08               434,988
- --------------------------------------------------------------------------------
Electric - Integrated - 0.8%
       600,000   El Paso Electric Co., 9.40%
                    first mortgage bonds, due 5/1/11                     682,500
- --------------------------------------------------------------------------------
Engineering - Research and Development - 0.6%
       500,000   Intertek Finance PLC, 10.25%
                    company guaranteed notes, due 11/1/06                530,000
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   33
<PAGE>

        JANUS ASPEN FLEXIBLE INCOME PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Finance - Auto Loans - 1.5%
  $  1,250,000   General Motors Acceptance Corp., 6.125%
                    senior subordinated notes, due 1/22/08         $   1,228,125
- --------------------------------------------------------------------------------
Finance - Other Services - 2.5%
     2,000,000   Mellon Financial Co., 6.375%
                    subordinated notes, due 2/15/10                    1,995,000
- --------------------------------------------------------------------------------
Food - Diversified - 1.0%
       750,000   Ralston-Ralston Purina Group, 7.875%
                    debentures, due 6/15/25                              860,625
- --------------------------------------------------------------------------------
Food - Retail - 1.6%
       250,000   Disco S.A., 9.875%
                    notes, due 5/15/08                                   236,250
       910,000   Pantry, Inc., 10.25%
                    company guaranteed notes, due 10/15/07               925,925
       150,000   Star Markets Co., Inc., 13.00%
                    senior subordinated notes, due 11/1/04               168,750
- --------------------------------------------------------------------------------
                                                                       1,330,925
- --------------------------------------------------------------------------------
Funeral Services and Related Items - 1.2%
       750,000   Loewen Group, Inc., 7.60%
                    notes, due 6/1/08+                                   751,875
       250,000   Service Corporation International, 7.70%
                    notes, due 4/15/09                                   274,375
- --------------------------------------------------------------------------------
                                                                       1,026,250
- --------------------------------------------------------------------------------
Home Furnishings - 1.1%
       450,000   Cort Furniture Rental, 12.00%
                    senior notes, due 9/1/00                             488,250
       390,000   Lifestyle Furnishings International, Inc.,
                    10.875%, company guaranteed notes,
                    due 8/1/06                                           435,337
- --------------------------------------------------------------------------------
                                                                         923,587
- --------------------------------------------------------------------------------
Industrial Audio and Video Products - 0.1%
       100,000   Unifrax Investment Corp., 10.50%
                    senior notes, due 11/1/03                            104,500
- --------------------------------------------------------------------------------
Insurance Brokers - 0.6%
       500,000   SIG Capital Trust I, 9.50%
                    company guaranteed notes, due 8/15/27                512,500
- --------------------------------------------------------------------------------
Life and Health Insurance - 1.1%
       742,000   Delphi Financial Group, Inc., 8.00%
                    senior notes, due 10/1/03                            775,390
       120,000   Penncorp Financial Group, Inc., 9.25%
                    senior subordinated notes, due 12/15/03              125,550
- --------------------------------------------------------------------------------
                                                                         900,940
- --------------------------------------------------------------------------------
Manufacturing - 0.7%
       500,000   Day International Group, Inc., 11.125%
                    senior notes, due 6/1/05                             554,375
- --------------------------------------------------------------------------------
Medical - Hospitals - 1.7%
                 Columbia/HCA Healthcare Corp.:
     1,300,000      7.19%, debentures, due 11/15/15                    1,223,625
       235,000      7.05%, debentures, due 12/01/27                      206,800
- --------------------------------------------------------------------------------
                                                                       1,430,425
- --------------------------------------------------------------------------------
Medical Instruments - 0.6%
       500,000   United States Surgical Corp., 7.25%
                    senior notes, due 3/15/08                            528,750
- --------------------------------------------------------------------------------
Medical Nursing Home - 0.6%
       500,000   Extendicare Health Services, Inc., 9.35%
                    company guaranteed notes, due 12/15/07               513,750
- --------------------------------------------------------------------------------
Medical Products - 0.3%
       250,000   ALARIS Medical, Inc., 9.75%
                    company guaranteed notes, due 12/1/06                260,625
- --------------------------------------------------------------------------------
Money Center Banks - 1.3%
  $  1,000,000   Chase Manhattan Corp., 6.75%
                    subordinated notes, due 8/15/08                $   1,031,250
- --------------------------------------------------------------------------------
Multimedia - 4.1%
       250,000   News America Holdings, Inc., 7.70%
                    debentures, due 10/30/25+                            266,875
                 Time Warner, Inc.:
     1,000,000      8.18%, notes, due 8/15/07                          1,110,000
     1,000,000      6.95%, company guaranteed notes,
                    due 1/15/28                                        1,010,000
     1,000,000   Walt Disney Co. (The), 6.75%
                    senior notes, due 3/30/06                          1,043,750
- --------------------------------------------------------------------------------
                                                                       3,430,625
- --------------------------------------------------------------------------------
Music/Clubs - 0.6%
       880,000   V2 Music Holdings PLC, 14.00%
                    units, due 4/15/08*                                  457,600
- --------------------------------------------------------------------------------
Networking Products - 0.6%
       500,000   Anixter International, Inc., 8.00%
                    company guaranteed notes, due 9/15/03                530,000
- --------------------------------------------------------------------------------
Office Automation and Equipment - 0.6%
       500,000   Dictaphone Corp., 11.75%
                    senior subordinated notes, due 8/1/05                506,250
- --------------------------------------------------------------------------------
Oil Companies - Exploration and Production - 1.9%
     1,557,000   Magnum Hunter Resources, Inc., 10.00%
                    company guaranteed notes, due 6/1/07               1,595,925
- --------------------------------------------------------------------------------
Paint and Related Products - 0.6%
       500,000   Sherwin-Williams Co., 6.85%
                    notes, due 2/1/07                                    525,625
- --------------------------------------------------------------------------------
Physical Therapy and Rehabilitation Centers - 0.9%
       750,000   HEALTHSOUTH Corp., 7.00%
                    senior notes, due 6/15/08                            747,187
- --------------------------------------------------------------------------------
Property and Casualty Insurance - 1.1%
       500,000   First American Capital Trust, 8.50%
                    company guaranteed notes, due 4/15/12                559,375
       350,000   Orion Capital Corp., 7.25%
                    senior notes, due 7/15/05                            366,625
- --------------------------------------------------------------------------------
                                                                         926,000
- --------------------------------------------------------------------------------
Recreational Centers - 1.6%
     1,250,000   Bally Total Fitness Holding Corp., 9.875%
                    senior subordinated notes, due 10/15/07            1,287,500
- --------------------------------------------------------------------------------
Reinsurance - 0.6%
       500,000   Veritas Capital Trust, 10.00%
                    company guaranteed notes, due 1/1/28                 523,750
- --------------------------------------------------------------------------------
Rental Auto/Equipment - 1.1%
       750,000   Ryder TRS, Inc., 10.00%
                    senior subordinated notes, due 12/1/06               870,000
- --------------------------------------------------------------------------------
Retail - Internet - 0.4%
       500,000   Amazon.com, Inc., zero coupon
                    senior discount notes, due 5/1/08                    304,375
- --------------------------------------------------------------------------------
Retail - Leisure Products - 0.2%
       150,000   Selmer Co., Inc., 11.00%
                    senior subordinated notes, due 5/15/05               163,125
- --------------------------------------------------------------------------------
Retail - Music Store - 0.7%
                 Musicland Group, Inc.:
       370,000      9.00%, senior subordinated notes,
                    due 6/15/03                                          356,125
       200,000      9.875%, company guaranteed notes,
                    due 3/15/08                                          199,000
- --------------------------------------------------------------------------------
                                                                         555,125
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   34
<PAGE>

        JANUS ASPEN FLEXIBLE INCOME PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Retail - Regional Department Stores - 2.4%
  $  2,000,000   Fred Meyer, Inc., 7.45%
                    senior notes, due 3/1/08                       $   2,007,500
- --------------------------------------------------------------------------------
Retail - Restaurants - 2.1%
       250,000   ROMACORP, Inc., 12.00%
                    senior notes, due 7/1/06+                            250,000
     1,500,000   McDonald's Corp., 6.375%
                    debentures, due 1/8/28                             1,515,000
- --------------------------------------------------------------------------------
                                                                       1,765,000
- --------------------------------------------------------------------------------
Satellite Telecommunications - 2.2%
       575,000   American Mobile Satellite Corp., 12.25%
                    units, due 4/1/08                                    546,250
       250,000   Digital Television Services, L.L.C., 12.50%
                    company guaranteed notes, due 8/1/07                 285,625
       500,000   Innova S. de R.L., 12.875%
                    senior notes, due 4/1/07                             506,250
       500,000   PanAmSat Corp., 6.375%
                    notes, due 1/15/08+                                  500,625
- --------------------------------------------------------------------------------
                                                                       1,838,750
- --------------------------------------------------------------------------------
Savings/Loan/Thrifts - 2.2%
     1,650,000   Local Financial Corp., 11.00%
                    senior notes, due 9/8/04                           1,810,875
- --------------------------------------------------------------------------------
Steel - Producers - 0.7%
       500,000   Weirton Steel Corp., 11.375%
                    senior notes, due 7/1/04                             536,250
- --------------------------------------------------------------------------------
Telecommunication Equipment - 0.6%
       500,000   Global Tele-Systems, Ltd., 9.875%
                    senior notes, due 2/15/05                            515,625
- --------------------------------------------------------------------------------
Telecommunication Services - 2.1%
       380,000   McLeodusa, Inc., 8.375%
                    senior notes, due 3/15/08                            380,950
       750,000   Metricom, Inc. 8.00%
                    subordinated notes, due 9/15/03                      729,375
       600,000   Talton Holdings, Inc., 11.00%
                    company guaranteed notes, due 6/30/07                646,500
- --------------------------------------------------------------------------------
                                                                       1,756,825
- --------------------------------------------------------------------------------
Telephone - Integrated - 1.4%
       300,000   Dobson Wireline Co., 12.250%
                    senior notes, due 6/15/08                            291,750
     1,000,000   Intermedia Communications, Inc., zero coupon
                    senior discount notes, due 5/15/06                   822,500
- --------------------------------------------------------------------------------
                                                                       1,114,250
- --------------------------------------------------------------------------------
Telephone - Long Distance - 1.3%
     1,000,000   WorldCom, Inc., 7.75%
                    notes, due 4/1/07                                  1,083,750
- --------------------------------------------------------------------------------
Television - 0.3%
        50,000   Dialog Corp. PLC, 11.00%
                    senior subordinated notes, due 11/15/07               55,250
       150,000   Pegasus Media Communications, 12.50%
                    notes, due 7/1/05                                    169,500
- --------------------------------------------------------------------------------
                                                                         224,750
- --------------------------------------------------------------------------------
Tools - Hand Held - 0.3%
       250,000   Simonds Industries, Inc., 10.25%
                    senior subordinated notes, due 7/1/08                250,000
- --------------------------------------------------------------------------------
Total Corporate Bonds (cost $57,486,851)                              59,032,065
- --------------------------------------------------------------------------------
U.S. Government Obligations - 15.4%
                 U.S. Treasury Notes:
     1,000,000      5.50%, due 5/31/03                                   999,300
    10,000,000      6.125%, due 8/15/07                               10,400,200
     1,400,000      5.625%, due 5/15/08                                1,418,578
- --------------------------------------------------------------------------------
Total U.S. Government Obligations (cost $12,744,705)                  12,818,078
- --------------------------------------------------------------------------------
Foreign Bonds - 0.1%
- --------------------------------------------------------------------------------
DEM    200,000   Esprit Telecom Group PLC, 11.00%
                    senior notes, due 6/15/08  (cost $111,798)     $     109,970
- --------------------------------------------------------------------------------
Preferred Stocks - 1.0%
- --------------------------------------------------------------------------------
Cable Television - 0.2%
         2,500   Houston Industries, Inc., 7.00%                         186,250
- --------------------------------------------------------------------------------
Internet Software - 0.4%
           300   Concentric Network Corp., 13.50%+                       303,750
- --------------------------------------------------------------------------------
Savings/Loan/Thrifts - 0.4%
        10,000   Chevy Chase Savings, 13.00%                             310,000
- --------------------------------------------------------------------------------
Total Preferred Stocks (cost $783,056)                                   800,000
- --------------------------------------------------------------------------------
Warrants - 0%
                 Gothic Energy Corp.:
         2,621      exp. 1/23/03*                                          2,621
         7,700      exp. 9/1/04*                                           7,700
- --------------------------------------------------------------------------------
Total Warrants (cost $0)                                                  10,321
- --------------------------------------------------------------------------------
U.S. Government Agency - 9.7%
                 Freddie Mac
  $  8,000,000      5.85%, 7/1/98 (amortized cost $8,000,000)          8,000,000
- --------------------------------------------------------------------------------
Total Investments (total cost $79,126,410) - 97.3%                    80,770,434
- --------------------------------------------------------------------------------
Cash, Receivables and Other Assets, net of Liabilities - 2.7%          2,203,531
- --------------------------------------------------------------------------------
Net Assets - 100%                                                  $  82,973,965
- --------------------------------------------------------------------------------


                       Summary of Investments by Country
                                 June 30, 1998

Country                     % of Investment Securities             Market Value
- --------------------------------------------------------------------------------
Argentina                                0.3%                     $      236,250
Mexico                                   0.6%                            506,250
United Kingdom                           0.9%                            695,220
United States++                         98.2%                         79,332,714
- --------------------------------------------------------------------------------
Total                                  100.0%                     $   80,770,434
================================================================================
++Includes Short-Term Securities (88.3% excluding Short-Term Securites)


                           Forward Currency Contracts
                             Open at June 30, 1998

Currency Sold and                Currency           Currency         Unrealized
Settlement Date                 Units Sold        Value in $ U.S.    Gain/(Loss)
- --------------------------------------------------------------------------------
German Deutschemark 3/5/99          195,000         $   109,366       $  1,106
- --------------------------------------------------------------------------------
Total                                               $   109,366       $  1,106
================================================================================

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   35
<PAGE>

     JANUS ASPEN HIGH-YIELD PORTFOLIO Portfolio Manager, Sandy R. Rufenacht

     The continuation of a strong U.S. economy provided a positive  backdrop for
the high-yield bond market, and during the six-month period ended June 30, 1998,
Janus Aspen High-Yield Portfolio returned 6.74% for the Institutional Shares and
6.40% for the Retirement  Shares. In comparison,  the Lehman Brothers High Yield
Index gained 4.50%. All returns include reinvested dividends. The average annual
total returns for the period ended June 30, 1998, follow on the next page.

High-Yield Issuance Continues to Grow

     A second  round of  financial  turmoil  in Asia kept  interest  rates at an
all-time low while the stock market soared.  Because of the correlation  between
the performance of high-yield securities and stocks,  high-yield bonds benefited
from this environment;  however,  an excess of new high-yield  issuance tempered
results  for much of the  segment.  On the  upside,  the  flood of new  issuance
indicates more companies are turning to the high-yield market rather than stocks
to finance capital improvements and acquisitions.

     The oversupply in high-yield  bonds has prompted our investment team to dig
even deeper,  with rigorous analysis based on extensive  financial  modeling and
on-site visits to nearly all of our holdings. Although we've uncovered a few new
ideas,  we remain  focused  on the tried and true  names  that have a history of
proven performance.

Positioned to Move Full Steam Ahead

     In terms of the Portfolio's  construction,  I think it's helpful to compare
it to a train. Approximately 15% of the Portfolio consists of what I refer to as
"locomotives."  These are our more aggressive  high-yield  ideas,  typically the
highest-risk names, with the best appreciation  prospects and a generous coupon.
"Rail cars" make up the vast majority of the  Portfolio.  They generally move in
sync with the marketplace, and while they may not carry as much upside potential
as some of our more aggressive ideas,  they allow us to clip a good coupon.  The
remainder of the  securities  fall into the "caboose"  section.  These are bonds
that trade near their  yield-to-call and offer limited downside risk and a solid
coupon.  These three types of securities offer a diversified mix and competitive
yield to investors.

     Our  biggest  success  during the period was Ryder  Trucks,  a position  we
purchased for its "rail car" qualities,  but that more recently has evolved into
a "caboose."  Ryder  recently  separated from its parent company and initiated a
series of  enhancements  to compete  with its biggest  rival in the rental truck
industry  - U-Haul.  Ryder  reduced  the size of its fleet and,  through  better
analysis of trends,  made changes to improve the  utilization of its trucks.  To
that end,  Ryder  sold all of its  rental  trucks  and then  leased  them  back,
allowing  management  to improve its cash flows and repay some of its debt.  The
transition to "caboose" came shortly  thereafter  when Budget Rental  Trucks,  a
perceived  investment-grade rated company (no public debt), acquired Ryder. Soon
after,  Budget  commenced a tender offer at a  substantial  premium to where the
bond had been trading.

     Another  strong  performer  was Isle of Capri - a bond we  consider to be a
"locomotive."  This gaming company is currently  building a large casino complex
in  Blackhawk,  Colorado.  While gaming  revenues in and around  Blackhawk  have
increased over the last several months,  this market's full potential has yet to
be  tapped.  We also stand to benefit  from  favorable  terms as a result of our
participation  in the  structuring of this deal, not to mention our proximity to
the  casino.  We believe  this bond  should  continue  to provide us with strong
upside potential which more than outweighs any downside risk.

     While the Portfolio logged solid results, we did suffer a disappointment in
Hollywood Park Casinos, one of our largest positions. The bond declined upon the
market's  unfavorable  view of some  recent  acquisitions  made by the  company,
including its purchase of Casino Magic.  However,  I believe  Hollywood  Park is
currently  misunderstood by the market and will likely exceed all second quarter
expectations.  Going  forward,  it appears as though the  acquisition  of Casino
Magic will account for 50% of  consolidated  cash flow,  further  supporting the
company's  bottom line.  Hollywood  Park is also shedding its poorly  performing
racetrack business to focus on its core gaming business; therefore, I've decided
to maintain our holdings.

- --------------------------------------------------------------------------------
Portfolio Asset Mix                     June 30, 1998     December 31, 1997
Weighted Average Maturity                 7.2 Yrs.            6.8 Yrs.
Average Modified Duration*                5.0 Yrs.            4.5 Yrs.
30-Day Average Yield
  Institutional Shares**                    8.15%               8.10%
    Without Reimbursement**                 7.25%               7.04%
  Retirement Shares**                       7.60%               7.68%
    Without Reimbursement**                 6.71%               6.60%
Average Rating                                 B                  B+
- --------------------------------------------------------------------------------
*A theoretical measure of price volatility.
** Yields will fluctuate.

Outlook Remains Positive

     Looking ahead, I believe  renewed  concerns over economic  problems in Asia
will  keep  inflation  and  interest  rates  in  check.  As a  result,  I remain
optimistic  about the high-yield  bond sector.  Despite the fact that the sector
may suffer from the  continuation of excessive  high-yield  issuance,  I believe
we've addressed this situation by stepping up our stringent fundamental analysis
and increasing  the number of on-site visits each month.  With the prospect of a
continued  strong equity market as a backdrop,  the Portfolio is well positioned
going forward.

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

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   36
<PAGE>

     JANUS ASPEN HIGH-YIELD PORTFOLIO Portfolio Manager, Sandy R. Rufenacht

- --------------------------------------------------------------------------------
Average Annual Total Return(1)
For the Periods Ended June 30, 1998
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 5/1/96)
  1 Year                                          15.48%
  From Inception                                  16.47%
- --------------------------------------------------------------------------------
Lehman Brothers High-Yield Bond Index
  1 Year                                          11.36%
  From Inception Date of Institutional Shares     12.33%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                          14.92%
  From Inception                                  16.19%
- --------------------------------------------------------------------------------

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


           JANUS ASPEN HIGH-YIELD PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Corporate Bonds - 94.4%
- --------------------------------------------------------------------------------
Advertising Services - 3.3%
  $     27,000   Outsourcing Services Group, 10.875%
                    senior subordinated notes, due 3/1/06+         $      27,540
       100,000   Young America Corp., 11.625%
                    senior subordinated notes, due 2/15/06                99,000
- --------------------------------------------------------------------------------
                                                                         126,540
- --------------------------------------------------------------------------------
Auto Repair Centers - 2.2%
        85,000   Diamond Triumph Autoglass, Inc., 9.25%
                    senior notes, due 4/1/08                              86,487
- --------------------------------------------------------------------------------
Automotive - Truck Parts and Equipment - 0.5%
        20,000   J.H. Heafner Co., Inc., 10.00%
                    senior notes, due 5/15/08+                            20,350
- --------------------------------------------------------------------------------
Broadcast Services and Programming - 0.4%
        20,000   Fox/Liberty Networks, L.L.C., 9.75%
                    senior discount notes, due 8/15/07                    13,925
- --------------------------------------------------------------------------------
Building - Heavy Construction - 1.2%
        45,000   Iron Age Corp., 9.875%
                    senior subordinated notes, due 5/1/08                 45,000
- --------------------------------------------------------------------------------
Building - Residential and Commercial - 0.7%
        28,000   Toll Corp., 9.50%
                    senior subordinated notes, due 3/15/03                28,910
- --------------------------------------------------------------------------------
Building and Construction - 0.9%
        35,000   Reliant Building Products, 10.875%
                    senior subordinated notes, due 5/1/04                 35,175
- --------------------------------------------------------------------------------
Cable Television - 4.7%
        75,000   Adelphia Communications Corp., 9.25%
                    senior notes, due 10/1/02                             77,625
        25,000   Fundy Cable, Ltd., 11.00%
                    senior notes, due 11/15/05                            27,437
         5,000   Galaxy Telecom, L.P., 12.375%
                    senior subordinated notes, due 10/1/05                 5,562
        20,000   Lenfest Communications, Inc., 8.25%
                    senior subordinated notes, due 2/15/08                20,850
        40,000   Mediacom, L.L.C., 8.50%
                    senior notes, due 4/15/08+                            39,900
        10,000   Rifkin Acquisition Partners, L.P., 11.125%
                    senior subordinated notes, due 1/15/06                11,025
- --------------------------------------------------------------------------------
                                                                         182,399
- --------------------------------------------------------------------------------
Casino Hotels - 1.0%
  $     15,000   Trump Atlantic City Associates, 11.25%
                    company guaranteed notes, due 5/1/06           $      14,587
        25,000   Venetian Casino Resort, L.L.C., 12.25%
                    mortgage bonds, due 11/15/04                          25,812
- --------------------------------------------------------------------------------
                                                                          40,399
- --------------------------------------------------------------------------------
Casino Services - 1.3%
        50,000   Isle of Capri Blackhawk, L.L.C., 13.00%
                    first mortgage bonds, due 8/31/04                     52,750
- --------------------------------------------------------------------------------
Cellular Telecommunications - 2.9%
       100,000   Nextel Communications, Inc., zero coupon
                    senior discount notes, due 8/15/04                    97,500
        25,000   Telesystem International Wireless, Inc.,
                    zero coupon senior discount notes,
                    due 11/1/07                                           15,031
- --------------------------------------------------------------------------------
                                                                         112,531
- --------------------------------------------------------------------------------
Circuit Boards - 0.6%
        25,000   Details, Inc., 10.00%
                    senior subordinated notes, due 11/15/05               25,250
- --------------------------------------------------------------------------------
Coal - 1.0%
        20,000   Lodestar Holdings, Inc., 11.50%
                    senior notes, due 5/15/05                             20,175
        20,000   P&L Coal Holdings Corp., 9.625%
                    senior subordinated notes, due 5/15/08+               20,550
- --------------------------------------------------------------------------------
                                                                          40,725
- --------------------------------------------------------------------------------
Consumer Products - 0.3%
        20,000   Diamond Brands, Inc., 12.875%
                    debentures, due 4/15/09+                              10,775
- --------------------------------------------------------------------------------
Containers - Paper and Plastic - 1.0%
        35,000   Plastic Containers, Inc., 10.00%
                    senior notes, due 12/15/06                            37,625
- --------------------------------------------------------------------------------
Distribution and Wholesale - 2.5%
       100,000   Aviation Sales Co., 8.125%
                    senior subordinated notes, due 2/15/08                97,750
- --------------------------------------------------------------------------------
Educational Software - 1.1%
        40,000   Herff Jones, Inc., 11.00%
                    senior subordinated notes, due 8/15/05                44,050
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   37
<PAGE>

           JANUS ASPEN HIGH-YIELD PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Engineering - Research and Development Services - 2.3%
                 CSC Holdings, Inc.:
  $     40,000      7.875%, senior notes, due 12/15/07             $      42,316
        45,000      8.125%, debentures, due 8/15/09                       48,263
- --------------------------------------------------------------------------------
                                                                          90,579
- --------------------------------------------------------------------------------
Engines - Internal Combustion - 0.5%
        20,000   Wells Aluminum Corp., 10.125%
                    senior notes, due 6/1/05                              21,100
- --------------------------------------------------------------------------------
Finance - Other Services - 0.3%
            20   SF Holdings Group, Inc., zero coupon
                    units, due 3/15/08                                    11,000
- --------------------------------------------------------------------------------
Food - Diversified - 2.2%
        85,000   Richmont Marketing Specialists, 10.125%
                    senior subordinated notes, due 12/15/07               86,594
- --------------------------------------------------------------------------------
Food - Retail - 4.5%
        50,000   Eagle Family Foods, 8.75%
                    senior subordinated notes, due 01/15/08               48,687
        75,000   Marsh Supermarkets, Inc., 8.875%
                    company guaranteed notes, due 8/1/07                  76,687
        45,000   Star Markets Co., Inc., 13.00%
                    senior subordinated notes, due 11/1/04                50,625
- --------------------------------------------------------------------------------
                                                                         175,999
- --------------------------------------------------------------------------------
Funeral Services and Related Items - 0.4%
        15,000   Prime Succession Acquisition Co., 10.75%
                    senior subordinated notes, due 8/15/04                16,425
- --------------------------------------------------------------------------------
Gambling - Non-Hotel Casinos - 1.4%
        25,000   Casino America, Inc., 12.50%
                    senior notes, due 8/1/03                              28,250
        25,000   Lady Luck Gaming Corp., 11.875%
                    first mortgage notes, due 3/1/01                      25,875
- --------------------------------------------------------------------------------
                                                                          54,125
- --------------------------------------------------------------------------------
Home Decorating Products - 0.8%
        32,000   Home Interiors & Gifts, Inc., 10.125%
                    senior subordinated notes, due 6/1/08                 32,640
- --------------------------------------------------------------------------------
Home Furnishings - 0.6%
        20,000   Cort Furniture Rental, 12.00%
                    senior notes, due 9/1/00                              21,700
- --------------------------------------------------------------------------------
Hotels and Motels - 0.9%
        35,000   Hard Rock Hotel, Inc., 9.25%
                    senior subordinated notes, due 4/1/05                 35,700
- --------------------------------------------------------------------------------
Human Resources - 0.7%
        25,000   COMFORCE Corp., 12.00%
                    senior notes, due 12/1/07                             27,000
- --------------------------------------------------------------------------------
Instruments - Controls - 1.0%
        35,000   Imo Industries, Inc., 11.75%
                    senior subordinated notes, due 5/1/06                 39,463
- --------------------------------------------------------------------------------
Machinery - General Industrial - 1.1%
        40,000   Fairfield Manufacturing Co., Inc., 11.375%
                    senior subordinated notes, due 7/1/01                 41,750
- --------------------------------------------------------------------------------
Machinery - Print Trade - 0.7%
        25,000   Goss Graphic Systems, Inc., 12.00%
                    senior subordinated notes, due 10/15/06               26,438
- --------------------------------------------------------------------------------
Manufacturing - 3.8%
                 Foamex International, Inc.:
        80,000      13.50%, senior subordinated notes,
                    due 8/15/05+                                          92,700
        50,000      9.875%, company guaranteed notes,
                    due 6/15/07                                           54,125
- --------------------------------------------------------------------------------
                                                                         146,825
- --------------------------------------------------------------------------------
Medical Products - 0.6%
  $     25,000   Universal Hospital Services, Inc., 10.25%
                    senior notes, due 3/1/08+                      $      25,000
- --------------------------------------------------------------------------------
Metal Processors and Fabricators - 1.1%
        40,000   Hawk Corp, 10.25%
                    senior notes, due 12/1/03                             42,900
- --------------------------------------------------------------------------------
Music/Clubs - 0.5%
            40   V2 Music Holdings PLC, zero coupon
                    units, due 4/15/08                                    20,800
- --------------------------------------------------------------------------------
Networking Products - 0.5%
        20,000   Exodus Communications, Inc., 11.25%
                    senior notes, due 7/1/08+                             20,025
- --------------------------------------------------------------------------------
Printing - Commercial - 0.9%
        35,000   R.H. Donnelly, Inc., 9.125%
                    senior subordinated notes, due 6/1/08                 35,613
- --------------------------------------------------------------------------------
Racetracks - 3.8%
       144,000   Hollywood Park, Inc., 9.50%
                    senior subordinated notes, due 8/1/07                148,500
- --------------------------------------------------------------------------------
Radio - 1.7%
        60,000   SFX Broadcasting, Inc., 10.75%
                    senior subordinated notes, due 5/15/06                66,675
- --------------------------------------------------------------------------------
Recreational Centers - 1.1%
        40,000   Bally Total Fitness Holding Corp., 9.875%
                    senior subordinated notes, due 10/15/07               41,200
- --------------------------------------------------------------------------------
Reinsurance - 0.3%
        10,000   Veritas Holdings GMBH, 9.625%
                    senior notes, due 12/15/03                            10,638
- --------------------------------------------------------------------------------
Rental Auto/Equipment - 1.5%
        50,000   Ryder TRS, Inc., 10.00%
                    senior subordinated notes, due 12/1/06                58,000
- --------------------------------------------------------------------------------
Retail - Convenience Stores - 0.5%
        20,000   Core-Mark International, Inc., 11.375%
                    senior subordinated notes, due 9/15/03                21,275
- --------------------------------------------------------------------------------
Retail - Discount - 1.7%
        50,000   Hills Stores Co., 12.50%
                    senior notes, due 7/1/03                              49,750
        15,000   Pamida Holdings Corp., 11.75%
                    senior subordinated notes, due 3/15/03                15,563
- --------------------------------------------------------------------------------
                                                                          65,313
- --------------------------------------------------------------------------------
Retail - Diversified - 3.0%
                 Eye Care Centers of America, Inc.:
        40,000      12.00%, senior notes, due 10/1/03                     43,300
        35,000      9.125%, senior subordinated notes,
                    due 5/1/08                                            34,563
        40,000   Falcon Holding Group, 8.375%
                    debentures, due 4/15/10                               40,100
- --------------------------------------------------------------------------------
                                                                         117,963
- --------------------------------------------------------------------------------
Retail - Drug Store - 0.7%
        25,000   Community Distributors, Inc., 10.25%
                    company guaranteed notes, due 10/15/04                25,750
- --------------------------------------------------------------------------------
Retail - Internet - 0.9%
        60,000   Amazon.com, Inc., zero coupon
                    senior discount notes, due 5/1/08                     36,525
- --------------------------------------------------------------------------------
Retail - Music Store - 1.3%
        50,000   MTS, Inc., 9.375%
                    senior subordinated notes, due 5/1/05+                49,313
- --------------------------------------------------------------------------------
Retail - Regional Department Stores - 2.1%
        80,000   Fred Meyer, Inc., 7.45%
                    senior notes, due 3/1/08                              80,300
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   38
<PAGE>

           JANUS ASPEN HIGH-YIELD PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Shares or
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Satellite Telecommunications - 0.4%
  $         15   American Mobile Satellite Corp., 12.25%
                    units, due 4/1/08+                             $      14,250
- --------------------------------------------------------------------------------
Savings/Loan/Thrifts - 2.1%
        75,000   Local Financial Corp., 11.00%
                    senior notes, due 9/8/04                              82,313
- --------------------------------------------------------------------------------
Steel - Producers - 1.3%
                 Steel Heddle Group, Inc.:
        20,000      10.625%, senior subordinated notes,
                    due 6/1/08+                                           20,150
        30,000      zero coupon, debentures, due 6/1/09+                  15,337
        15,000   Weirton Steel Corp., 11.375%
                    senior notes, due 7/1/04                              16,088
- --------------------------------------------------------------------------------
                                                                          51,575
- --------------------------------------------------------------------------------
Telecommunication Services - 9.4%
        60,000   21st Century Telecom Group, Inc., zero coupon
                    senior discount notes, due 2/15/08                    33,825
        50,000   IDT Corp., 8.75%
                    senior notes, due 2/15/06                             48,562
        20,000   IXC Communications, Inc., 9.00%
                    senior subordinated notes, due 4/15/08                19,950
        73,000   Level 3 Communications, Inc., 9.125%
                    senior notes, due 5/1/08                              70,992
        60,000   Microcell Telecommunications, Inc., zero coupon
                    senior discount notes, due 6/1/06                     29,700
            40   Onepoint Communications Corp., 14.50%
                    units, due 6/1/08+                                    38,400
        10,000   Peoples Telephone Co., Inc., 12.25%
                    senior notes, due 7/15/02                             10,525
        60,000   Pinnacle Holdings, Inc., zero coupon
                    senior discount notes, due 3/15/08                    39,300
        20,000   SBA Communications Corp., 12.00%
                    senior discount notes, due 3/1/08+                    12,600
        47,000   Telegroup, Inc., zero coupon
                    senior discount notes, due 11/1/04                    37,130
        45,000   Teligent, Inc., zero coupon
                    senior discount notes, due 3/1/08+                    24,806
- --------------------------------------------------------------------------------
                                                                         365,790
- --------------------------------------------------------------------------------
Telephone - Integrated - 3.0%
        25,000   Dobson Wireline Co., 12.25%
                    senior notes, due 6/15/08                             24,312
                 Intermedia Communications, Inc.:
        85,000      zero coupon, senior discount notes,
                    due 5/15/06                                           69,912
        30,000      zero coupon, senior discount notes,
                    due 7/15/07                                           21,975
- --------------------------------------------------------------------------------
                                                                         116,199
- --------------------------------------------------------------------------------
Telephone - Local - 1.0%
        50,000   e.spire Communications, Inc., zero coupon
                    senior discount notes, due 4/1/06                     39,625
- --------------------------------------------------------------------------------
Telephone - Long Distance - 2.0%
        25,000   Esprit Telecom Group PLC, 11.50%
                    senior notes, due 12/15/07                            25,750
        50,000   Primus Telecommunications Group, Inc., 11.75%
                    senior notes, due 8/1/04                              53,000
- --------------------------------------------------------------------------------
                                                                          78,750
- --------------------------------------------------------------------------------
Television - 2.3%
        50,000   Dialog Corp. PLC, 11.00%
                    senior subordinated notes, due 11/15/07               55,250
        10,000   Price Communications Corp., 11.75%
                    senior subordinated notes, due 7/15/07                11,150
        25,000   TV Bandeirantes, 12.875%
                    notes, due 5/15/06+                                   21,563
- --------------------------------------------------------------------------------
                                                                          87,963
- --------------------------------------------------------------------------------
Textile - Products - 0.5%
  $     20,000   Glenoit Corp., 11.00%
                    company guaranteed notes, due 4/15/07          $      21,400
- --------------------------------------------------------------------------------
Transportation - Services - 0.8%
        30,000   Atlantic Express, Inc., 10.75%
                    company guaranteed notes, due 2/1/04                  31,950
- --------------------------------------------------------------------------------
Water - 2.0%
        75,000   Sparkling Spring Water Group, 11.50%
                    senior subordinated notes, due 11/15/07               79,313
- --------------------------------------------------------------------------------
Wire and Cable Products - 0.6%
        20,000   International Wire Group, Inc., 11.75%
                    senior subordinated notes, due 6/1/05                 22,000
- --------------------------------------------------------------------------------
Total Corporate Bonds (cost $3,641,079)                                3,684,897
- --------------------------------------------------------------------------------
Preferred Stock - 1.6%
- --------------------------------------------------------------------------------
Broadcast Services and Programming - 0.2%
             1   Paxson Communications Corp., 13.25%                      10,000
- --------------------------------------------------------------------------------
Engineering - Research and Development Services - 0.9%
           520   CSC Holdings, Inc., 8.50%                                33,249
- --------------------------------------------------------------------------------
Savings/Loan/Thrifts - 0.5%
           600   Chevy Chase Savings, 13.00%                              18,600
- --------------------------------------------------------------------------------
Total Preferred Stock (cost $60,137)                                      61,849
- --------------------------------------------------------------------------------
Warrants - 0.2%
                 Gothic Energy Corp.:
           238      exp. 1/23/03*                                            238
           700      exp. 9/1/04*                                             700
           160   Microcell Telecommunications, Inc.
                    - exp. 6/1/06*,+                                       4,000
            50   Primus Telecommunications Group, Inc.
                    - exp. 8/1/04*                                         1,900
- --------------------------------------------------------------------------------
Total Warrants (cost $2,000)                                               6,838
- --------------------------------------------------------------------------------
U.S. Government Agency - 3.9%
                 Freddie Mac
  $    155,000      5.85%, 7/1/98 (amortized cost $155,000)              155,000
- --------------------------------------------------------------------------------
Total Investments (total cost $3,858,216) - 100.1%                     3,908,584
- --------------------------------------------------------------------------------
Liabilities, net of Cash, Receivables and Other Assets - (0.1%)          (5,311)
- --------------------------------------------------------------------------------
Net Assets - 100%                                                  $   3,903,273
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   39
<PAGE>

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

     For the six-month  period ended June 30, 1998,  Janus Aspen Short-Term Bond
Portfolio's  Institutional Shares appreciated 2.78%, while its Retirement Shares
gained 2.56%. In comparison,  the Lehman Brothers  Government/Corporate 1-3 Year
Bond Index appreciated  3.03%. Both returns include  reinvested  dividends.  The
average  annual total returns for the period ended June  30,1998,  follow on the
next page.

     While  the  majority  of  our  investments   were  solid,  the  Portfolio's
performance  lagged  its  benchmark  because  of  a  substantial  cash  position
throughout the period.  I allowed cash levels to build in anticipation of taking
advantage of selected opportunities during temporary downturns in the market.

Two Sides of the Asian Crisis

     U.S.  government  debt again  became the safe haven  during the period as a
result of renewed  economic  turmoil in Asia. The continuing  decline in the yen
was particularly  unsettling and injected new volatility into Asian and domestic
stock  markets,  causing  a  flight  to  U.S.  dollar-denominated  assets.  U.S.
Treasuries benefited the most from these developments,  experiencing a brief but
significant rally before retreating upon the U.S. central bank's intervention to
strengthen  the yen.  As a result of this  rally,  the  Portfolio's  substantial
investment in Treasuries proved advantageous.

     On the flip side,  investment-grade  corporate bonds,  which also made up a
large  portion  of the  Portfolio,  lagged  Treasuries  during  the first  half.
Corporate  bonds traded at their lowest  prices in years  relative to government
bonds as worries about profits,  the impact of the Asian crisis,  and a flood of
new issuance restrained this segment.  However,  because of their limited credit
risk, I remain  optimistic  about corporate bonds,  particularly  several of our
long-time  holdings,   including  IBM  Corp.,  Smith-Kline  Beecham,  and  Hyatt
Equities.

Positioned for Flexibility

     The Portfolio  remains  positioned for flexibility,  allowing it to respond
quickly to changes  in  interest  rates.  We've  accomplished  this by holding a
sizable  weighting in  investment-grade  bonds,  along with  Treasuries and cash
equivalents.  We also  maintained a  relatively  small  weighting in  high-yield
bonds, which involve slightly higher credit risk than investment-grade bonds but
offer more attractive yields. This position will remain small in preparation for
the future liquidation of the Portfolio.

- --------------------------------------------------------------------------------
Portfolio Asset Mix                     June 30, 1998     December 31, 1997
Investment-Grade Corp. Bonds                35.2%               82.5%
High-Yield/High-Risk Corp. Bonds             8.6%                 --
U.S. Government Obligations                 40.6%                 --
Cash & Cash Equivalents                     15.6%               17.5%
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
Portfolio Profile                       June 30, 1998     December 31, 1997
Weighted Average Maturity                   2.2 Yrs.            1.9 Yrs.
Average Modified Duration*                  1.9 Yrs.            1.6 Yrs.
30-day Average Yield
  Institutional Shares**                    5.62%               6.15%
    Without Reimbursement**                 5.19%               4.94%
  Retirement Shares**                       5.10%               5.57%
    Without Reimbursement**                 4.68%               4.36%
Average Rating                                A+                  A+
- --------------------------------------------------------------------------------
*A theoretical measure of price volatility.
** Yields will fluctuate.

Possible Worldwide Economic Slowdown

     My  outlook  for the  bond  market  is  stable  to good.  The  inflationary
environment  appears muted,  and interest rates should remain low, kept in check
by continued financial pressures in Asia. I believe troubles in the Far East may
cause a worldwide  slowdown and am  beginning  to see a lot of  crossover-buying
into  bonds as a result.  After  three  years of strong  stock  market  returns,
investors seem to be rediscovering the added safety of the bond market. Wherever
interest rates are headed,  the Portfolio is positioned to respond quickly,  and
the mix of securities should keep yields competitive.

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

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   40
<PAGE>

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

- --------------------------------------------------------------------------------
Average Annual Total Return(1)
For the Periods Ended June 30, 1998
- --------------------------------------------------------------------------------
Institutional Shares (Inception Date 9/13/93)
  1 Year                                           6.28%
  From Inception                                   5.02%
- --------------------------------------------------------------------------------
Lehman Brothers Govt./Corp. 1-3 Year Bond Index
  1 Year                                           6.79%
  From Inception Date of Institutional Shares      5.66%
- --------------------------------------------------------------------------------
Retirement Shares (Inception Date 5/1/97)
  1 Year                                           5.74%
  From Inception                                   6.14%
- --------------------------------------------------------------------------------

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


        JANUS ASPEN SHORT-TERM BOND PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Corporate Bonds - 43.8%
- --------------------------------------------------------------------------------
Building - Residential and Commercial - 0.5%
  $     21,000  Toll Corp., 9.50%
                    senior subordinated notes, due 3/15/03         $      21,683
- --------------------------------------------------------------------------------
Computers - Mainframe - 4.7%
       200,000   IBM Corp., 6.375%
                    global notes, due 6/15/00                            202,000
- --------------------------------------------------------------------------------
Diversified Financial Services - 4.7%
       100,000   Associates Corp. N.A., 5.85%
                    senior notes, due 1/15/01                             99,750
       100,000   Chrysler Financial Corp., 6.625%
                    notes, due 8/15/00                                   101,375
- --------------------------------------------------------------------------------
                                                                         201,125
- --------------------------------------------------------------------------------
Finance - Auto Loans - 2.3%
       100,000   Ford Motor Credit Co., 6.25%
                    notes, due 11/8/00                                   100,500
- --------------------------------------------------------------------------------
Finance - Investment Bankers/Brokers - 2.3%
       100,000   Merrill Lynch & Co., Inc., 6.00%
                    notes, due 3/1/01                                    100,125
- --------------------------------------------------------------------------------
Hotels and Motels - 4.0%
        65,000   Host Marriott Corp., 9.50%
                    senior notes, due 5/15/05                             68,900
       100,000   Hyatt Equities, L.L.C., 6.80%
                    notes, due 5/15/00+                                  101,125
- --------------------------------------------------------------------------------
                                                                         170,025
- --------------------------------------------------------------------------------
Machinery - General Industrial - 1.8%
        75,000   Fairfield Manufacturing Co., Inc., 11.375%
                    senior subordinated notes, due 7/1/01                 78,281
- --------------------------------------------------------------------------------
Manufacturing - 2.2%
        80,000   Foamex L.P., 13.50%
                    senior subordinated notes, due 8/15/05+               92,700
- --------------------------------------------------------------------------------
Medical - Drugs - 2.4%
       100,000   SmithKline Beecham PLC, 6.75%
                    company guaranteed notes, due 10/30/01               102,375
- --------------------------------------------------------------------------------
Multimedia - 3.5%
       150,000   Walt Disney Co. (The), 6.375%
                    senior notes, due 3/30/01                            152,063
- --------------------------------------------------------------------------------
Paint and Related Products - 2.3%
  $    100,000   Sherwin-Williams Co., 6.25%
                    notes, due 2/1/00                              $     100,625
- --------------------------------------------------------------------------------
Pipelines - 2.3%
       100,000   Enron Corp., 6.45%
                    notes, due 11/15/01                                  100,875
- --------------------------------------------------------------------------------
Retail - Discount - 4.7%
       100,000   TJX Companies, Inc., 6.625%
                    notes, due 6/15/00                                   100,875
       100,000   Woolworth Corp., 7.00%
                    notes, due 6/1/00                                    101,250
- --------------------------------------------------------------------------------
                                                                         202,125
- --------------------------------------------------------------------------------
Retail - Regional Department Stores - 2.6%
       110,000   Fred Meyer, Inc., 7.15%
                    senior notes, due 3/1/03                             110,000
- --------------------------------------------------------------------------------
Super-Regional Banks - 3.5%
       150,000   NationsBank Corp., 5.75%
                    senior notes, due 3/15/01                            149,250
- --------------------------------------------------------------------------------
Total Corporate Bonds (cost $1,877,921)                                1,883,752
- --------------------------------------------------------------------------------
U.S. Government Obligation - 40.6%
     1,725,000   U.S. Treasury Note 6.375%
                    due 1/15/00 (cost $1,746,844)                      1,746,407
- --------------------------------------------------------------------------------
U.S. Government Agency - 13.8%
                 Freddie Mac
       595,000      5.85%, 7/1/98 (amortized cost $595,000)              595,000
- --------------------------------------------------------------------------------
Total Investments (total cost $4,219,765) - 98.2%                      4,225,159
- --------------------------------------------------------------------------------
Cash, Receivables and Other Assets, net of Liabilities - 1.8%             77,549
- --------------------------------------------------------------------------------
Net Assets - 100%                                                  $   4,302,708
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   41
<PAGE>

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

Performance Review

     For the six months ended June 30, 1998,  Janus Aspen Money Market Portfolio
returned 2.63% for the Institutional  Shares, and the Retirement Shares posted a
return of 2.39%. The seven-day current yield for the period ended June 30, 1998,
was 4.91% and 4.43% for the Institutional and Retirement  Shares,  respectively.
The yield quoted more accurately  reflects the current earnings of the Portfolio
rather than the total return.

Focused on the Shortest of Short-Term Securities

     During  the  period,   the  market   appeared  to  be  controlled  more  by
expectations than by facts.  Investors' perceptions  surrounding events in Asia,
as well as speculation  regarding the direction of interest  rates,  led to wide
yet temporary swings in the market. At the same time, the crisis in the Far East
helped  contribute  to  moderate  economic  growth  in the U.S.,  while  keeping
inflation  in  check.  The  latter  caused  the  Federal  Reserve  Board to hold
overnight  rates steady,  pegging the federal funds rate at 5.5%  throughout the
entire  period.  Alluding to this in a recent  meeting  with  Congress,  Federal
Reserve Chairman Alan Greenspan  commented that renewed economic turmoil in Asia
could further dampen U.S. growth,  possibly easing the need for an interest rate
hike in the months ahead.

     The combination of these circumstances  persuaded me to invest primarily in
very short-term  obligations (as of June 30, the  Portfolio's  weighted  average
maturity  was 17 days),  because they are less  sensitive to market  forces than
longer-term  issues and react instead to changes in the federal funds rate. This
is clearly why the yield curve of  short-term  securities  during the period was
relatively  flat.  As  measured  by the  yield on the  one-year  Treasury  bill,
short-term issues traded between 5.47% on the high end and 4.55% on the low end.

Our Discipline Proved Beneficial

     With Asia's increasing financial problems,  particularly the decline of the
yen and the subsequent devaluation of other Asian currencies, foreign investment
in U.S. Treasury securities increased.  This flight to quality, however, focused
almost  entirely  on  longer-dated  Treasury  securities  (30-year),  which  are
considered among the world's safest,  highest-rated investments.  Our investment
universe,  primarily Treasury bills and other instruments with maturities of one
year or less, was minimally affected.

     Overall,  our strict  discipline  of detailed  credit  analysis and careful
evaluation  of  each   company's   risk-reward   characteristics   again  proved
beneficial.  Thus,  we were able to produce a  competitive  yield with low risk.
Going forward,  until the global  picture  becomes  clearer,  the Portfolio will
remain invested primarily in securities with very short-term maturities.  In the
meantime,  I will continue to closely monitor various indicators,  some of which
appear to show signs of a pending economic slowdown.

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

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

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   42
<PAGE>

          JANUS ASPEN MONEY MARKET PORTFOLIO June 30, 1998 (unaudited)
- --------------------------------------------------------------------------------
Principal Amount                                                    Market Value
- --------------------------------------------------------------------------------
Certificates of Deposit - 7.7%
                 Bayerische Landesbaken A.G.:
  $  1,000,000      5.775%, 7/27/98                                $     999,909
     1,000,000      5.71%, 10/6/98                                       999,672
- --------------------------------------------------------------------------------
Total Certificates of Deposit (cost $1,999,581)                        1,999,581
- --------------------------------------------------------------------------------
Short-Term Corporate Notes - 54.6%
     1,000,000   America Express Credit Corp.
                    5.51%, 8/11/98                                       993,724
     1,000,000   Associates Corp. of North America
                    5.50%, 8/7/98                                        994,347
     1,000,000   Bankers Trust Co.
                    5.58%, 8/12/98                                       993,490
     1,000,000   CIT Group Holdings, Inc.
                    5.50%, 8/7/98                                        994,347
     1,250,000   Coca-Cola Corp.
                    5.52%, 7/28/98                                     1,244,825
     1,444,000   Cogentrix of Richmond, Inc.
                    5.65%, 7/17/98                                     1,440,374
     1,200,000   Ford Motor Credit Corp.
                    5.55%, 7/13/98                                     1,197,780
     1,000,000   General Electric Capital Corp.
                    5.52%, 8/13/98                                       993,407
     1,400,000   General Motors Acceptance Corp.
                    5.55%, 7/15/98                                     1,396,978
     1,500,000   Goldman Sachs Group, L.P.
                    5.60%, 7/2/98                                      1,499,767
     1,500,000   PHH Corp.
                    5.75%, 7/7/98                                      1,498,563
     1,000,000   Sanwa Business Credit Corp.
                    6.15%, 7/23/98                                       996,242
- --------------------------------------------------------------------------------
Total Short-Term Corporate Notes (amortized cost $14,243,844)         14,243,844
- --------------------------------------------------------------------------------
Repurchase Agreements - 44.7%
  $  5,660,000   Goldman Sachs and Co., 6.10%
                    dated 6/30/98 maturing 7/1/98, to be
                    repurchased at $5,702,354 in Freddie Mac
                    6.50%, 9/1/03; with a value of $5,773,201***   $   5,660,000
     6,000,000   Morgan Stanley, Dean Witter, Discover & Co.,
                    6.25% dated 6/30/98 maturing 7/1/98, to
                    be repurchased at $6,001,042,
                    collateralized by $3,515,303 in Fannie
                    Mae 0.472% - 17.258%, 6/25/00 - 7/18/28;
                    by $3,369,053 in Freddie Mac 6.00% -
                    855.25%, 10/15/05 - 6/15/35; with
                    respective values of $4,502,980 and
                    $2,928,608***                                      6,000,000
- --------------------------------------------------------------------------------
Total Repurchase Agreements (cost $11,660,000)                        11,660,000
- --------------------------------------------------------------------------------
Total Investments (total cost $27,903,425) - 107.0%                   27,903,425
- --------------------------------------------------------------------------------
Liabilities, net of Cash, Receivables and Other Assets - (7.0%)      (1,826,875)
- --------------------------------------------------------------------------------
Net Assets - 100%                                                  $  26,076,550
- --------------------------------------------------------------------------------

See Notes to Schedules of Investments.


                        NOTES TO SCHEDULES OF INVESTMENTS

(ADR) - American Depository Receipt
(GDR) - Global Depository Receipt
DEM - German Deutschemark
Adjustable Rate Preferred Stock Dividend Rates are as of 6/30/98.
  * Non-income-producing security
 ** A portion of this  security has been  segregated  by the  custodian to cover
    segregation requirements on open forward currency contracts.
*** Repurchase  Agreements  held by the Portfolio are fully  collateralized  and
    such  collateral is in the  possession  of the  Portfolio's  custodian.  The
    collateral  is evaluated  daily to ensure its market value equals or exceeds
    the current  market value of the  repurchase  agreements  including  accrued
    interest.  In the event of  default on the  obligation  to  repurchase,  the
    Portfolio has the right to liquidate the  collateral  and apply the proceeds
    in satisfaction of the obligation.  In the event of default or bankruptcy by
    the  other  party to the  agreement,  realization  and/or  retention  of the
    collateral or proceeds may be subject to legal proceedings.
+   Securities  are  registered  pursuant to Rule  144A and may be  deemed to be
    restricted for resale.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   43
<PAGE>

              This space reserved for your notes and computations.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   44
<PAGE>

                      STATEMENTS OF ASSETS AND LIABILITIES
<TABLE>
<CAPTION>
As of June 30, 1998 (unaudited)                     Janus Aspen   Janus Aspen   Janus Aspen   Janus Aspen
(all numbers in thousands except      Janus Aspen    Aggressive     Capital    International   Worldwide    Janus Aspen
Retirement Shares outstanding and       Growth         Growth     Appreciation     Growth        Growth      Balanced
net asset value per share)             Portfolio     Portfolio     Portfolio     Portfolio     Portfolio     Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
Assets:
<S>                                    <C>           <C>           <C>           <C>           <C>           <C>       
  Investments at cost                  $  655,819    $  473,108    $   18,518    $  218,842    $1,925,968    $  484,221
====================================================================================================================================
  Investments at value                 $  836,409    $  636,295    $   22,984    $  265,961    $2,524,897    $  563,315
  Cash                                        159           119            38            24         1,072            87
  Receivables:
    Investments sold                          873           592           705         3,256        33,058            99
    Portfolio shares sold                   1,248           249           353           342         3,455         1,139
    Interest                                   --            --            --            --             5         3,451
    Dividends                                 264           114             3           523         3,502           276
  Other assets                                 --            --            --            --            --            -- 
  Foreign currency contracts                   --            --            --           154         1,166            -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Total Assets                              838,953       637,369        24,083       270,260     2,567,155       568,367
- ------------------------------------------------------------------------------------------------------------------------------------
Liabilities:
  Payables:
    Investments purchased                   8,991        11,355            --        14,050       164,877         6,788
    Portfolio shares repurchased              779           783            --           136         7,938           211
    Advisery fee                              417           344            12           133         1,230           315
  Accrued expenses                             40            32             7            53           142            19
  Foreign currency contracts                   18           406            --            --            --            -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Total Liabilities                          10,245        12,920            19        14,372       174,187         7,333
- ------------------------------------------------------------------------------------------------------------------------------------
Net Assets                             $  828,708    $  624,449    $   24,064    $  255,888    $2,392,968    $  561,034
====================================================================================================================================
Net Assets - Institutional Shares:     $  828,694    $  624,434    $   24,047    $  255,875    $2,391,846    $  561,020
  Shares Outstanding, $.001 Par Value
   (unlimited shares authorized)           40,040        25,905         1,454        11,528        83,328        28,191
  Net Asset Value Per Share            $    20.70    $    24.10    $    16.54    $    22.20    $    28.70    $    19.91
====================================================================================================================================
Net Assets - Retirement Shares:        $       14    $       15    $       17    $       13    $    1,122    $       14
  Shares Outstanding, $.001 Par Value
   (unlimited shares authorized)              675           620         1,000           607        39,061           688
  Net Asset Value Per Share            $    20.66    $    23.97    $    16.51    $    22.19    $    28.71    $    19.90
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

                STATEMENTS OF ASSETS AND LIABILITIES (Continued)
<TABLE>
<CAPTION>
As of June 30, 1998 (unaudited)       Janus Aspen   Janus Aspen   Janus Aspen                 Janus Aspen
(all numbers in thousands except        Equity       Growth and     Flexible    Janus Aspen    Short-Term   Janus Aspen
Retirement Shares outstanding and       Income         Income        Income      High-Yield       Bond      Money Market
net asset value per share)             Portfolio     Portfolio(1)  Portfolio     Portfolio     Portfolio     Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
Assets:
<S>                                    <C>           <C>           <C>           <C>           <C>           <C>       
  Investments at cost                  $    4,824    $    1,683    $   79,126    $    3,858    $    4,220    $   27,903
====================================================================================================================================
  Investments at value                 $    5,761    $    1,761    $   80,770    $    3,909    $    4,225    $   27,903
  Cash                                         29             2            63            18            --            --
  Receivables:
    Investments sold                            1             1         1,148            69            --            --
    Portfolio shares sold                       6            35           278            --            --           111
    Interest                                    5             1         1,443            79            88            99
    Dividends                                   4            --             4            --            --            --
  Other assets                                 --             6             1             3             2            --
  Foreign currency contracts                   --            --             1            --            --            --
- ------------------------------------------------------------------------------------------------------------------------------------
Total Assets                                5,806         1,806        83,708         4,078         4,315        28,113
- ------------------------------------------------------------------------------------------------------------------------------------
Liabilities:
  Payables:
    Investments purchased                       8           100           530           144            --            --
    Portfolio shares repurchased               --            --           152            15             4         2,025
    Advisery fee                                3             1            43             2             2             6
  Accrued expenses                              6             3             9            14             6             5
  Foreign currency contracts                   --            --            --            --            --            --
- ------------------------------------------------------------------------------------------------------------------------------------
Total Liabilities                              17           104           734           175            12         2,036
- ------------------------------------------------------------------------------------------------------------------------------------
Net Assets                             $    5,789    $    1,702    $   82,974    $    3,903    $    4,303    $   26,077
====================================================================================================================================
Net Assets - Institutional Shares:     $    5,772    $    1,691    $   82,962    $    3,891    $    4,292    $   26,066
  Shares Outstanding, $.001 Par Value
   (unlimited shares authorized)              354           160         6,939           328           491        26,066
  Net Asset Value Per Share            $    16.29    $    10.56    $    11.96    $    11.87    $     8.74    $     1.00
====================================================================================================================================
Net Assets - Retirement Shares:        $       17    $       11    $       12    $       12    $       11    $       11
  Shares Outstanding, $.001 Par Value
   (unlimited shares authorized)            1,013         1,000           966         1,004         1,225        10,552
  Net Asset Value Per Share            $    16.21    $    10.55    $    11.96    $    11.88    $     8.75    $     1.00
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

                            STATEMENTS OF OPERATIONS
<TABLE>
<CAPTION>
                                                        Janus Aspen   Janus Aspen   Janus Aspen   Janus Aspen              
For the six months ended                  Janus Aspen    Aggressive     Capital    International   Worldwide    Janus Aspen
June 30, 1998 (unaudited)                   Growth         Growth     Appreciation     Growth        Growth      Balanced  
(all numbers in thousands)                 Portfolio     Portfolio     Portfolio     Portfolio     Portfolio     Portfolio 
- ------------------------------------------------------------------------------------------------------------------------------------
Investment Income:
<S>                                        <C>           <C>           <C>           <C>           <C>           <C>      
  Interest                                 $   1,823     $     303     $      41     $     425     $   2,514     $   5,018
  Dividends                                    2,397           709            31         2,059        17,175         1,816
  Foreign tax withheld                         (121)          (26)            --         (269)       (2,153)          (55)
- ------------------------------------------------------------------------------------------------------------------------------------
Total Investment Income                        4,099           986            72         2,215        17,536         6,779
- ------------------------------------------------------------------------------------------------------------------------------------
Expenses:
  Advisery fees                                2,317         1,971            49           657         6,406         1,649
  Transfer agent fees and expenses                 2             1            --             1            12             2
  Registration fees                                6             6            --            --            23             2
  System fees                                      7            10             4             6             9             8
  Custodian fees                                  73            70            11           188           647            39
  Insurance expense                                5             5            --             1             1            -- 
  Audit fees                                       6             9             6             8             8             6
  Other expenses                                   6             4             2             3            11             3
- ------------------------------------------------------------------------------------------------------------------------------------
Total Expenses                                 2,422         2,076            72           864         7,117         1,709
- ------------------------------------------------------------------------------------------------------------------------------------
Less: Expense Offset                             (3)          (15)            --           (1)           (8)          (10)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Expenses                                   2,419         2,061            72           863         7,109         1,699
- ------------------------------------------------------------------------------------------------------------------------------------
Less: Excess Expense Reimbursement                --            --            --            --            --            -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Net Expenses After Reimbursement               2,419         2,061            72           863         7,109         1,699
- ------------------------------------------------------------------------------------------------------------------------------------
Net Investment Income/(Loss)                   1,680       (1,075)            --         1,352        10,427         5,080
- ------------------------------------------------------------------------------------------------------------------------------------
Net Realized and Unrealized
 Gain/(Loss) on Investments:
  Net realized gain/(loss)
   from securities transactions               16,937        41,969         (371)         2,091        44,291         8,435
  Net realized gain/(loss)
   from foreign currency transactions            (7)         (461)            --           705         9,055          (13)
  Net realized gain/(loss)
   from futures contracts                         --            --            --         (120)       (1,063)            -- 
  Change in net unrealized appreciation
   or depreciation of investments            106,146        49,112         4,201        35,179       395,879        58,751
- ------------------------------------------------------------------------------------------------------------------------------------
Net Gain on Investments                      123,076        90,620         3,830        37,855       448,162        67,173
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase in Net Assets
 Resulting from Operations                 $ 124,756     $  89,545     $   3,830     $  39,207     $ 458,589     $  72,253
====================================================================================================================================
</TABLE>

                            STATEMENTS OF OPERATIONS (Continued)
<TABLE>
<CAPTION>
                                          Janus Aspen   Janus Aspen   Janus Aspen                 Janus Aspen               
For the six months ended                    Equity       Growth and     Flexible    Janus Aspen    Short-Term   Janus Aspen 
June 30, 1998 (unaudited)                   Income         Income        Income      High-Yield       Bond      Money Market
(all numbers in thousands)                 Portfolio     Portfolio(1)  Portfolio     Portfolio     Portfolio     Portfolio  
- ------------------------------------------------------------------------------------------------------------------------------------
Investment Income:
<S>                                        <C>           <C>           <C>           <C>           <C>           <C>      
  Interest                                 $       3     $       2     $   2,518     $     161     $     112     $     729
  Dividends                                       27             1            23             3            --            --
  Foreign tax withheld                            --            --            --            --            --            --
- ------------------------------------------------------------------------------------------------------------------------------------
Total Investment Income                           30             3         2,541           164           112           729
- ------------------------------------------------------------------------------------------------------------------------------------
Expenses:
  Advisery fees                                   18             1           220            14            12            32
  Transfer agent fees and expenses                --             1            --            --            --            --
  Registration fees                               --            --             1             1            --            --
  System fees                                      2             2             6             5             4             5
  Custodian fees                                  13             5            16            13             5             3
  Insurance expense                               --            --            --            --            --            --
  Audit fees                                       4             1             4             6             3             4
  Other expenses                                   2            --             2             1             1             2
- ------------------------------------------------------------------------------------------------------------------------------------
Total Expenses                                    39            10           249            40            25            46
- ------------------------------------------------------------------------------------------------------------------------------------
Less: Expense Offset                              --            --           (2)            --            --            --
- ------------------------------------------------------------------------------------------------------------------------------------
Net Expenses                                      39            10           247            40            25            46
- ------------------------------------------------------------------------------------------------------------------------------------
Less: Excess Expense Reimbursement               (9)           (8)            --          (21)          (13)            --
- ------------------------------------------------------------------------------------------------------------------------------------
Net Expenses After Reimbursement                  30             2           247            19            12            46
- ------------------------------------------------------------------------------------------------------------------------------------
Net Investment Income/(Loss)                      --             1         2,294           145           100           683
- ------------------------------------------------------------------------------------------------------------------------------------
Net Realized and Unrealized
 Gain/(Loss) on Investments:
  Net realized gain/(loss)
   from securities transactions                   57             4         1,324            98             8            --
  Net realized gain/(loss)
   from foreign currency transactions              1            --             1           (1)            --            --
  Net realized gain/(loss)
   from futures contracts                         --            --            --            --            --            --
  Change in net unrealized appreciation
   or depreciation of investments                858            78          (54)          (14)           (8)            --
- ------------------------------------------------------------------------------------------------------------------------------------
Net Gain on Investments                          916            82         1,271            83            --            --
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase in Net Assets
 Resulting from Operations                 $     916     $      83     $   3,565     $     228     $     100     $     683
====================================================================================================================================
</TABLE>
(1) For the period May 1, 1998, (inception) to June 30, 1998.

See Notes to Financial Statements.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   45 and 46
<PAGE>

                       STATEMENTS OF CHANGES IN NET ASSETS
<TABLE>
<CAPTION>
For the six months ended
June 30, 1998, (unaudited)
and the fiscal year or period                      Janus Aspen          Janus Aspen          Janus Aspen          Janus Aspen
ended December 31, 1997                              Growth          Aggressive Growth  Capital Appreciation  International Growth
(all numbers in thousands(3))                       Portfolio            Portfolio            Portfolio            Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
                                                   1998       1997       1998       1997      1998    1997(1)      1998       1997
- ------------------------------------------------------------------------------------------------------------------------------------
Operations:
<S>                                            <C>        <C>        <C>        <C>        <C>       <C>       <C>        <C>     
  Net investment income/(loss)                 $  1,680   $  4,350   $(1,075)   $  (436)        --   $    25   $  1,352   $    669
  Net realized gain/(loss) from
   investment transactions                       16,930     47,939     41,508        788   $ (371)     (146)      2,676      (148)
  Change in unrealized net appreciation
   or (depreciation) of investments             106,146     39,125     49,112     56,805     4,201       265     35,179     10,109
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase/(Decrease) in
 Net Assets Resulting from Operations           124,756     91,414     89,545     57,157     3,830       144     39,207     10,630
- ------------------------------------------------------------------------------------------------------------------------------------
Dividends and Distributions:
  Net investment income                         (1,501)    (4,361)         --         --       (4)      (21)    (1,353)      (645)
  Dividends (in excess of net
   investment income)                                --         --         --         --        --        --         --         -- 
  Net realized gain from
   investment transaction                      (48,597)    (9,976)         --         --        --        --    (3,097)       (59)
  Distributions (in excess of realized gains)        --         --         --         --        --        --         --      (161)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Decrease in Net Assets
 from Dividends and Distributions              (50,098)   (14,337)         --         --       (4)      (21)    (4,450)      (865)
- ------------------------------------------------------------------------------------------------------------------------------------
Capital Share Transactions:
  Shares sold:
    Institutional Shares                        140,022    244,131    111,239    204,318    22,785     9,452    131,279    185,562
    Retirement Shares                                --         10         --         10        --        10         --         10
  Reinvested dividends and distributions:
    Institutional Shares                         50,097     14,337         --         --         4        21      4,450        864
    Retirement Shares                                 1         --         --         --        --        --         --         -- 
  Shares repurchased:
    Institutional Shares                       (44,363)   (53,051)   (84,546)  (136,967)   (9,397)   (2,760)   (75,700)   (62,291)
    Retirement Shares                                --         --         --         --        --        --         --         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase/(Decrease) in Net Assets
 from Capital Share Transactions                145,757    205,427     26,693     67,361    13,392     6,723     60,029    124,145
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase/(Decrease) in Net Assets           220,415    282,504    116,238    124,518    17,218     6,846     94,786    133,910
- ------------------------------------------------------------------------------------------------------------------------------------
Net Assets:
  Beginning of period                           608,293    325,789    508,211    383,693     6,846        --    161,102     27,192
- ------------------------------------------------------------------------------------------------------------------------------------
  End of period                                $828,708   $608,293   $624,449   $508,211   $24,064   $ 6,846   $255,888   $161,102
====================================================================================================================================
Net Assets consist of:
  Capital (par value and paid-in surplus)*     $631,615   $485,858   $431,230   $404,537   $20,115   $ 6,723   $209,167   $149,136
  Undistributed net investment
   income/(distribution in excess)*                 296        117    (1,075)         --        --         4         78         80
  Undistributed net realized
   gain/(loss) from investments*                 16,227     47,894     31,514    (9,994)     (517)     (146)      (626)      (206)
  Unrealized appreciation/(depreciation)
   of investments                               180,570     74,424    162,780    113,668     4,466       265     47,269     12,092
- ------------------------------------------------------------------------------------------------------------------------------------
                                               $828,708   $608,293   $624,449   $508,211   $24,064   $ 6,846   $255,888   $161,102
====================================================================================================================================
Transactions in Portfolio Shares -
 Institutional Shares:
  Shares sold                                     6,832     14,157      5,006     11,104     1,546       765      6,370     10,297
  Reinvested dividends and distributions          2,421        829         --         --        --         2        201         46
- ------------------------------------------------------------------------------------------------------------------------------------
Total                                             9,253     14,986      5,006     11,104     1,546       767      6,571     10,343
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Repurchased                              (2,134)    (3,068)    (3,828)    (7,417)     (633)     (226)    (3,759)    (3,357)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase/Decrease in Portfolio Shares         7,119     11,918      1,178      3,687       913       541      2,812      6,986
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Outstanding Beginning of Period           32,921     21,003     24,727     21,040       541        --      8,716      1,730
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Outstanding End of Period                 40,040     32,921     25,905     24,727     1,454       541     11,528      8,716
====================================================================================================================================
Transactions in Portfolio Shares -
 Retirement Shares:(3)
  Shares sold                                        --        618         --        620        --     1,000         --        595
  Reinvested dividends and distributions             40         17         --         --        --        --          8          4
- ------------------------------------------------------------------------------------------------------------------------------------
Total                                                40        635         --        620        --     1,000          8        599
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Repurchased                                   --         --         --         --        --        --         --         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase/Decrease in Portfolio Shares            40        635         --        620        --     1,000          8        599
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Outstanding Beginning of Period              635         --        620         --     1,000        --        599         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Outstanding End of Period                    675        635        620        620     1,000     1,000        607        599
====================================================================================================================================
Purchases and Sales of Investment Securities:
 (excluding Short-Term Securities)
  Purchases of Securities                      $331,142   $713,049   $357,614   $583,004   $14,741   $ 6,590   $139,362   $193,061
  Proceeds from Sales of Securities             247,216    506,228    333,162    509,947     3,230     1,165     79,280     73,634
  Purchases of Long-Term
   U.S. Government Obligations                       --         --         --         --        --        --         --         -- 
  Proceeds from Sales of Long-Term
   U.S. Government Obligations                       --         --         --         --        --        --         --         -- 
====================================================================================================================================

                 STATEMENTS OF CHANGES IN NET ASSETS (Continued)
<CAPTION>
For the six months ended                                                        
June 30, 1998, (unaudited)                                                                                              Janus Aspen
and the fiscal year or period                           Janus Aspen               Janus Aspen           Janus Aspen     Growth and
ended December 31, 1997                               Worldwide Growth             Balanced           Equity Income        Income
(all numbers in thousands(3))                            Portfolio                 Portfolio             Portfolio       Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
                                                         1998         1997         1998        1997      1998    1997(1)   1998(2)
- ------------------------------------------------------------------------------------------------------------------------------------
Operations:
<S>                                               <C>           <C>           <C>         <C>         <C>       <C>       <C>    
  Net investment income/(loss)                    $    10,427   $     7,744   $   5,080   $   5,061        --   $     3   $     1
  Net realized gain/(loss)
   from investment transactions                        52,283        46,834       8,422      13,320   $    58        71         4
  Change in unrealized net appreciation
   or (depreciation) of investments                   395,879       135,768      58,751      15,763       858        80        78
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase/(Decrease) in
 Net Assets Resulting from Operations                 458,589       190,346      72,253      34,144       916       154        83
- ------------------------------------------------------------------------------------------------------------------------------------
Dividends and Distributions:
  Net investment income                              (11,261)       (9,330)     (3,541)     (5,104)        --       (2)        -- 
  Dividends (in excess of
  net investment income)                                   --       (1,332)          --          --        --        --        -- 
  Net realized gain from investment transactions     (69,710)       (8,190)    (13,227)     (1,791)      (74)        --        -- 
  Distributions (in excess of realized gains)              --            --          --          --        --        --        --
- ------------------------------------------------------------------------------------------------------------------------------------
Net Decrease in Net Assets
 from Dividends and Distributions                    (80,971)      (18,852)    (16,768)     (6,895)      (74)       (2)        -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Capital Share Transactions:
  Shares sold:
    Institutional Shares                              489,211       897,983     143,217     254,907     3,288     3,884     1,680
    Retirement Shares                                     591           402          --          10        --        10        10
  Reinvested dividends and distributions:
    Institutional Shares                               80,937        18,852      16,768       7,744        74         2        -- 
    Retirement Shares                                      34            --          --          --        --        --        -- 
  Shares repurchased:
    Institutional Shares                            (132,360)      (94,383)    (16,857)    (12,969)   (1,475)     (988)      (71)
    Retirement Shares                                    (14)            --          --          --        --        --        -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase/(Decrease) in Net Assets
 from Capital Share Transactions                      438,399       822,854     143,128     249,692     1,887     2,908     1,619
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase/(Decrease) in Net Assets                 816,017       994,348     198,613     276,941     2,729     3,060     1,702
- ------------------------------------------------------------------------------------------------------------------------------------
Net Assets:
  Beginning of period                               1,576,951       582,603     362,421      85,480     3,060        --        -- 
- ------------------------------------------------------------------------------------------------------------------------------------
  End of period                                   $ 2,392,968   $ 1,576,951   $ 561,034   $ 362,421   $ 5,789   $ 3,060   $ 1,702
====================================================================================================================================
Net Assets consist of:
  Capital (par value and paid-in surplus)*        $ 1,765,993   $ 1,327,595   $ 471,851   $ 328,723   $ 4,796   $ 2,908   $ 1,619
  Undistributed net investment
   income/(distribution in excess)*                       723         1,556       1,667         129        --         1         1
  Undistributed net realized
   gain/(loss) from investments*                       26,214        43,642       8,423      13,228        56        71         4
  Unrealized appreciation/(depreciation)
   of investments                                     600,038       204,158      79,093      20,341       937        80        78
- ------------------------------------------------------------------------------------------------------------------------------------
                                                  $ 2,392,968   $ 1,576,951   $ 561,034   $ 362,421   $ 5,789   $ 3,060   $ 1,702
====================================================================================================================================
Transactions in Portfolio Shares -
 Institutional Shares:
  Shares sold                                          18,017        40,742       7,493      15,268       221       301       167
  Reinvested dividends and distributions                2,829           819         847         470         5        --        -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Total                                                  20,846        41,561       8,340      15,738       226       301       167
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Repurchased                                    (4,924)       (4,123)       (900)       (776)      (98)      (75)       (7)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase/Decrease in Portfolio Shares              15,922        37,438       7,440      14,962       128       226       160
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Outstanding Beginning of Period                 67,406        29,968      20,751       5,789       226        --        -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Outstanding End of Period                       83,328        67,406      28,191      20,751       354       226       160
====================================================================================================================================
Transactions in Portfolio Shares -
 Retirement Shares:(3)
  Shares sold                                          21,111        17,245          --         650        --     1,000     1,000
  Reinvested dividends and distributions                1,188             6          19          19        13        --        -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Total                                                  22,299        17,251          19         669        13     1,000     1,000
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Repurchased                                      (489)            --          --          --        --        --        -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase/Decrease in Portfolio Shares              21,810        17,251          19         669        13     1,000     1,000
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Outstanding Beginning of Period                 17,251            --         669          --     1,000        --        -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Outstanding End of Period                       39,061        17,251         688         669     1,013     1,000     1,000
====================================================================================================================================
Purchases and Sales of Investment Securities:
 (excluding Short-Term Securities)
  Purchases of Securities                         $   905,555   $ 1,715,083   $ 322,145   $ 377,245   $ 4,609   $ 3,560   $ 1,735
  Proceeds from Sales of Securities                   571,851       862,382     158,056     221,317     2,482       997       256
  Purchases of Long-Term
   U.S. Government Obligations                             --            --      69,081      70,831        --        --        -- 
  Proceeds from Sales of Long-Term
   U.S. Government Obligations                             --            --      87,964      13,669        --        --        -- 
====================================================================================================================================

                 STATEMENTS OF CHANGES IN NET ASSETS (Continued)
<CAPTION>
For the six months ended                                                       
June 30, 1998, (unaudited)                                                     
and the fiscal year or period                       Janus Aspen         Janus Aspen          Janus Aspen           Janus Aspen    
ended December 31, 1997                           Flexible Income        High-Yield        Short-Term Bond         Money Market
(all numbers in thousands(3))                        Portfolio           Portfolio            Portfolio             Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
                                                     1998       1997     1998       1997      1998       1997       1998       1997
- ------------------------------------------------------------------------------------------------------------------------------------
Operations:
<S>                                              <C>        <C>        <C>       <C>       <C>       <C>        <C>        <C>     
  Net investment income/(loss)                   $  2,294   $  2,522   $   145   $   125   $   100   $    724   $    683   $    461
  Net realized gain/(loss)
   from investment transactions                     1,325        683        97        67         8         48         --         -- 
  Change in unrealized net appreciation
   or (depreciation) of investments                  (54)      1,050      (14)        39       (8)         18         --         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase/(Decrease) in
 Net Assets Resulting from Operations               3,565      4,255       228       231       100        790        683        461
- ------------------------------------------------------------------------------------------------------------------------------------
Dividends and Distributions:
  Net investment income                           (2,464)    (2,372)     (152)     (117)     (138)      (722)      (683)      (461)
  Dividends (in excess of net investment income)       --         --        --        --        --         --         --         -- 
  Net realized gain from investment transactions    (704)      (322)      (66)       (6)      (46)        (4)         --         -- 
  Distributions (in excess of realized gains)          --         --        --        --        --         --         --         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Net Decrease in Net Assets
 from Dividends and Distributions                 (3,168)    (2,694)     (218)     (123)     (184)      (726)      (683)      (461)
- ------------------------------------------------------------------------------------------------------------------------------------
Capital Share Transactions:
  Shares sold:
    Institutional Shares                           31,670     35,431     2,814     3,976     2,667     23,232     83,537     78,614
    Retirement Shares                                  --         10        --        10        --         10         --         10
  Reinvested dividends and distributions:
    Institutional Shares                            3,168      2,693       217       122       184        724        683        461
    Retirement Shares                                  --          1         1         1        --          2         --         -- 
  Shares repurchased:
    Institutional Shares                          (6,370)   (10,902)   (2,064)   (2,075)   (1,209)   (33,188)   (73,527)   (69,807)
    Retirement Shares                                  --         --        --        --        --         --         --         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase/(Decrease) in Net Assets
 from Capital Share Transactions                   28,468     27,233       968     2,034     1,642    (9,220)     10,693      9,278
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase/(Decrease) in Net Assets              28,865     28,794       978     2,142     1,558    (9,156)     10,693      9,278
- ------------------------------------------------------------------------------------------------------------------------------------
Net Assets:
  Beginning of period                              54,109     25,315     2,925       783     2,745     11,901     15,384      6,106
- ------------------------------------------------------------------------------------------------------------------------------------
  End of period                                  $ 82,974   $ 54,109   $ 3,903   $ 2,925   $ 4,303   $  2,745   $ 26,077   $ 15,384
====================================================================================================================================
Net Assets consist of:
  Capital (par value and paid-in surplus)*       $ 79,998   $ 51,530   $ 3,752   $ 2,783   $ 4,288   $  2,646   $ 26,077   $ 15,384
  Undistributed net investment
   income/(distribution in excess)*                    38        208         4        12         1         39         --         -- 
  Undistributed net realized
   gain/(loss) from investments*                    1,293        672        97        66         9         47         --         -- 
  Unrealized appreciation/(depreciation)
   of investments                                   1,645      1,699        50        64         5         13         --         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
                                                 $ 82,974   $ 54,109   $ 3,903   $ 2,925   $ 4,303   $  2,745   $ 26,077   $ 15,384
====================================================================================================================================
Transactions in Portfolio Shares -
 Institutional Shares:
  Shares sold                                       2,606      3,048       230       343       296      2,279     83,537     78,614
  Reinvested dividends and distributions              265        234        18        11        21         78        683        461
- ------------------------------------------------------------------------------------------------------------------------------------
Total                                               2,871      3,282       248       354       317      2,357     84,220     79,075
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Repurchased                                  (525)      (941)     (167)     (179)     (134)    (3,242)   (73,528)   (69,807)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase/Decrease in Portfolio Shares           2,346      2,341        81       175       183      (885)     10,692      9,268
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Outstanding Beginning of Period              4,593      2,252       247        72       308      1,193     15,374      6,106
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Outstanding End of Period                    6,939      4,593       328       247       491        308     26,066     15,374
====================================================================================================================================
Transactions in Portfolio Shares -
 Retirement Shares:(3)
  Shares sold                                          --        876        --       893        --        986         --     10,000
  Reinvested dividends and distributions               34         56        54        57        48        191        246        306
- ------------------------------------------------------------------------------------------------------------------------------------
Total                                                  34        932        54       950        48      1,177        246     10,306
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Repurchased                                     --         --        --        --        --         --         --         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Net Increase/Decrease in Portfolio Shares              34        932        54       950        48      1,177        246     10,306
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Outstanding Beginning of Period                932         --       950        --     1,177         --     10,306         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Outstanding End of Period                      966        932     1,004       950     1,225      1,177     10,552     10,306
====================================================================================================================================
Purchases and Sales of Investment Securities:
 (excluding Short-Term Securities)
  Purchases of Securities                        $ 74,842   $ 46,074   $ 6,866   $ 6,515   $ 1,886   $  8,593         --         -- 
  Proceeds from Sales of Securities                52,994     31,006     6,647     4,066     2,291     14,559         --         -- 
  Purchases of Long-Term
   U.S. Government Obligations                     13,777     15,463       454        24     2,538     12,611         --         -- 
  Proceeds from Sales of Long-Term
   U.S. Government Obligations                     12,578      7,755       449        25       790     16,534         --         -- 
====================================================================================================================================
</TABLE>
(1) Period May 1, 1997, (inception) to December 31, 1997.
(2) Period May 1, 1998, (inception) to June 30, 1998.
(3) Transactions  in  Portfolio  Shares - Retirement  Shares  numbers are not in
    thousands.
*See Note 3 in Notes to Financial Statements.

See Notes to Financial Statements.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   47 and 48
<PAGE>

                  FINANCIAL HIGHLIGHTS - INSTITUTIONAL SHARES
<TABLE>
<CAPTION>
For a share outstanding during
the six months ended June 30, 1998,
(unaudited) or through each fiscal
year or period ended December 31                                          Janus Aspen Growth Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
                                                            1998       1997       1996       1995       1994       1993(1)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>        <C>        <C>        <C>        <C>        <C>     
Net Asset Value, Beginning of Period                    $  18.48   $  15.51   $  13.45   $  10.57   $  10.32   $  10.00
- ------------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                               .04        .15        .17        .28        .09        .03
  Net gains or (losses) on securities
   (both realized and unrealized)                           3.52       3.34       2.29       2.90        .20        .32
- ------------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                            3.56       3.49       2.46       3.18        .29        .35
- ------------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                   (.04)      (.15)      (.17)      (.30)      (.04)      (.03)
  Dividends (in excess of net investment income)              --         --         --         --         --         -- 
  Distributions (from capital gains)                      (1.30)      (.37)      (.23)         --         --         -- 
  Distributions (in excess of realized gains)                 --         --         --         --         --         -- 
  Tax return of capital                                       --         --         --         --         --         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                       (1.34)      (.52)      (.40)      (.30)      (.04)      (.03)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                          $  20.70   $  18.48   $  15.51   $  13.45   $  10.57   $  10.32
====================================================================================================================================
Total Return**                                            19.24%     22.75%     18.45%     30.17%      2.76%      3.50%
====================================================================================================================================
Net Assets, End of Period (in thousands)                $828,694   $608,281   $325,789   $126,911   $ 43,549   $  7,482
Average Net Assets for the Period (in thousands)        $717,087   $477,914   $216,125   $ 77,344   $ 26,464   $  3,191
Ratio of Gross Expenses to Average Net Assets*(2)          0.68%      0.70%      0.69%      0.78%        N/A        N/A
Ratio of Net Expenses to Average Net Assets*(2)            0.68%      0.69%      0.69%      0.76%      0.88%      0.25%
Ratio of Net Investment Income to Average Net Assets*      0.47%      0.91%      1.39%      1.24%      1.45%      2.54%
Portfolio Turnover Rate*                                     76%       122%        87%       185%       169%       162%
- ------------------------------------------------------------------------------------------------------------------------------------

<CAPTION>
For a share outstanding during
the six months ended June 30, 1998,
(unaudited) or through each fiscal
year or period ended December 31                                           Janus Aspen Aggressive Growth Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
                                                            1998         1997         1996         1995         1994       1993(1) 
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>          <C>          <C>          <C>          <C>          <C>     
Net Asset Value, Beginning of Period                    $  20.55     $  18.24     $  17.08     $  13.62     $  11.80     $  10.00
- ------------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                             (.04)           --           --          .24          .11          .01
  Net gains or (losses) on securities
   (both realized and unrealized)                           3.59         2.31         1.36         3.47         1.82         1.80
- ------------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                            3.55         2.31         1.36         3.71         1.93         1.81
- ------------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                      --           --           --        (.25)        (.11)        (.01)
  Dividends (in excess of net investment income)              --           --           --           --           --           -- 
  Distributions (from capital gains)                          --           --        (.19)           --           --           -- 
  Distributions (in excess of realized gains)                 --           --           --           --           --           -- 
  Tax return of capital                                       --           --        (.01)           --           --           -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                           --           --        (.20)        (.25)        (.11)        (.01)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                          $  24.10     $  20.55     $  18.24     $  17.08     $  13.62     $  11.80
====================================================================================================================================
Total Return**                                            17.27%       12.66%        7.95%       27.48%       16.33%       18.05%
====================================================================================================================================
Net Assets, End of Period (in thousands)                $624,434     $508,198     $383,693     $185,911     $ 41,289     $  1,985
Average Net Assets for the Period (in thousands)        $552,049     $418,464     $290,629     $107,582     $ 14,152     $  1,091
Ratio of Gross Expenses to Average Net Assets*(2)          0.76%        0.76%        0.76%        0.86%          N/A          N/A
Ratio of Net Expenses to Average Net Assets*(2)            0.75%        0.76%        0.76%        0.84%        1.05%        0.25%
Ratio of Net Investment Income to Average Net Assets*    (0.39%)      (0.10%)      (0.27%)        0.58%        2.18%        0.34%
Portfolio Turnover Rate*                                    124%         130%          88%         155%         259%          31%
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
*Annualized for periods of less than one full year. 
**Total return not annualized for periods of less than one full year. 
(1) Period September 13, 1993, (inception) to December 31, 1993. 
(2) See footnote #5 in Notes to Financial Statements.

See Notes to Financial Statements.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   49
<PAGE>

                  FINANCIAL HIGHLIGHTS - INSTITUTIONAL SHARES
<TABLE>
<CAPTION>
For a share outstanding during
the six months ended June 30, 1998, 
(unaudited) or through each fiscal
year or period ended December 31                              Janus Aspen International Growth Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
                                                            1998       1997       1996       1995       1994(1)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>        <C>        <C>        <C>        <C>     
Net Asset Value, Beginning of Period                    $  18.48   $  15.72   $  11.95   $   9.72   $  10.00
- ------------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                               .12        .11        .05        .09      (.09)
  Net gains or (losses) on securities
   (both realized and unrealized)                           3.99       2.80       4.06       2.16      (.19)
- ------------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                            4.11       2.91       4.11       2.25      (.28)
- ------------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                   (.12)      (.11)      (.11)      (.02)         -- 
  Dividends (in excess of net investment income)              --         --         --         --         -- 
  Distributions (from capital gains)                       (.27)      (.01)      (.23)         --         -- 
  Distributions (in excess of realized gains)                 --       (.03)        --         --         -- 
  Tax return of capital                                       --         --         --         --         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                        (.39)      (.15)      (.34)      (.02)         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                          $  22.20   $  18.48   $  15.72   $  11.95   $   9.72
====================================================================================================================================
Total Return**                                            22.22%     18.51%     34.71%     23.15%    (2.80%)
====================================================================================================================================
Net Assets, End of Period (in thousands)                $255,875   $161,091   $ 27,192   $  1,608   $  1,353
Average Net Assets for the Period (in thousands)        $200,476   $ 96,164   $  7,437   $  1,792   $  1,421
Ratio of Gross Expenses to Average Net Assets*(3)          0.87%      0.96%      1.26%      2.69%        N/A
Ratio of Net Expenses to Average Net Assets*(3)            0.87%      0.96%      1.25%      2.50%      2.50%
Ratio of Net Investment Income to Average Net Assets*      1.36%      0.70%      0.62%     (.80%)    (1.30%)
Portfolio Turnover Rate*                                     86%        86%        65%       211%       275%
- ------------------------------------------------------------------------------------------------------------------------------------

<CAPTION>
For a share outstanding during
the six months ended June 30, 1998,
(unaudited) or through each fiscal
year or period ended December 31                                         Janus Aspen Worldwide Growth  Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
                                                             1998        1997        1996        1995        1994      1993(2)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>         <C>         <C>         <C>         <C>         <C>      
Net Asset Value, Beginning of Period                    $   23.39   $   19.44   $   15.31   $   12.07   $   11.89   $   10.00
- ------------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                                .13         .16         .16         .11         .04         .02
  Net gains or (losses) on securities
   (both realized and unrealized)                            6.19        4.14        4.27        3.19         .14        1.89
- ------------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                             6.32        4.30        4.43        3.30         .18        1.91
- ------------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                    (.14)       (.17)       (.17)       (.06)          --       (.01)
  Dividends (in excess of net investment income)               --       (.02)          --          --          --          -- 
  Distributions (from capital gains)                        (.87)       (.16)       (.13)          --          --       (.01)
  Distributions (in excess of realized gains)                  --          --          --          --          --          -- 
  Tax return of capital                                        --          --          --          --          --          -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                        (1.01)       (.35)       (.30)       (.06)          --       (.02)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                          $   28.70   $   23.39   $   19.44   $   15.31   $   12.07   $   11.89
====================================================================================================================================
Total Return**                                             27.02%      22.15%      29.04%      27.37%       1.53%      19.10%
====================================================================================================================================
Net Assets, End of Period (in thousands)                $2,391,846  $1,576,548  $ 582,603   $ 108,563   $  37,728   $   4,856
Average Net Assets for the Period (in thousands)        $1,979,002  $1,148,951  $ 304,111   $  59,440   $  22,896   $   2,200
Ratio of Gross Expenses to Average Net Assets*(3)           0.73%       0.74%       0.80%       0.90%         N/A         N/A
Ratio of Net Expenses to Average Net Assets*(3)             0.73%       0.74%       0.80%       0.87%       1.18%       0.25%
Ratio of Net Investment Income to Average Net Assets*       1.06%       0.67%       0.83%       0.95%       0.50%       0.84%
Portfolio Turnover Rate*                                      68%         80%         62%        113%        217%         57%
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
*Annualized for periods of less than one full year. 
**Total return not annualized for periods of less than one full year. 
(1) Period May 2, 1994, (inception) to December 31, 1994. 
(2) Period September 13, 1993, (inception) to December 31, 1993. 
(3) See footnote #5 in Notes to Financial Statements.

See Notes to Financial Statements.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   50
<PAGE>

                   FINANCIAL HIGHLIGHTS - INSTITUTIONAL SHARES
<TABLE>
<CAPTION>
For a share outstanding during the
six months ended June 30, 1998, 
(unaudited) or through each fiscal
year or period ended December 31                                            Janus Aspen Balanced Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
                                                             1998        1997        1996        1995        1994        1993(1)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                      <C>         <C>         <C>         <C>         <C>         <C>     
Net Asset Value, Beginning of Period                     $  17.47    $  14.77    $  13.03    $  10.63    $  10.64    $  10.00
- ------------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                                .18         .34         .32         .17         .15         .08
  Net gains or (losses) on securities
   (both realized and unrealized)                            2.88        2.89        1.81        2.45       (.06)         .64
- ------------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                             3.06        3.23        2.13        2.62         .09         .72
- ------------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                    (.13)       (.35)       (.30)       (.22)       (.10)       (.08)
  Dividends (in excess of net investment income)               --          --          --          --          --          -- 
  Distributions (from capital gains)                        (.49)       (.18)       (.09)          --          --          -- 
  Distributions (in excess of realized gains)                  --          --          --          --          --          -- 
  Tax return of capital                                        --          --          --          --          --          -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                         (.62)      (0.53)       (.39)       (.22)       (.10)       (.08)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                           $  19.91    $  17.47    $  14.77    $  13.03    $  10.63    $  10.64
====================================================================================================================================
Total Return**                                             17.45%      22.10%      16.18%      24.79%       0.84%       7.20%
====================================================================================================================================
Net Assets, End of Period (in thousands)                 $561,020    $362,409    $ 85,480    $ 14,021    $  3,153    $    537
Average Net Assets for the Period (in thousands)         $452,881    $176,432    $ 43,414    $  5,739    $  2,336    $    521
Ratio of Gross Expenses to Average Net Assets*(2)           0.76%       0.83%       0.94%       1.37%         N/A         N/A
Ratio of Net Expenses to Average Net Assets*(2)             0.76%       0.82%       0.92%       1.30%       1.57%       0.25%
Ratio of Net Investment Income to Average Net Assets*       2.26%       2.87%       2.92%       2.41%       1.90%       2.69%
Portfolio Turnover Rate*                                     113%        139%        103%        149%        158%        126%
- ------------------------------------------------------------------------------------------------------------------------------------

<CAPTION>
For a share outstanding during the
six months ended June 30, 1998,
(unaudited) or through each fiscal
year or period ended December 31                                         Janus Aspen Flexible Income Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
                                                             1998        1997        1996        1995        1994        1993 (1)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                      <C>         <C>         <C>         <C>         <C>         <C>     
Net Asset Value, Beginning of Period                     $  11.78    $  11.24    $  11.11    $   9.48    $   9.97    $  10.00
- ------------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                                .33         .67         .74         .53         .47         .11
  Net gains or (losses) on securities
   (both realized and unrealized)                             .33         .62         .24        1.70       (.56)       (.04)
- ------------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                              .66        1.29         .98        2.23       (.09)         .07
- ------------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                    (.37)       (.64)       (.72)       (.60)       (.40)       (.10)
  Dividends (in excess of net investment income)               --          --          --          --          --          -- 
  Distributions (from capital gains)                        (.11)       (.11)       (.13)          --          --          -- 
  Distributions (in excess of realized gains)                  --          --          --          --          --          -- 
  Tax return of capital                                        --          --          --          --          --          -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                         (.48)       (.75)       (.85)       (.60)       (.40)       (.10)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                           $  11.96    $  11.78    $  11.24    $  11.11    $   9.48    $   9.97
====================================================================================================================================
Total Return**                                              5.57%      11.76%       9.19%      23.86%     (0.91%)       0.70%
====================================================================================================================================
Net Assets, End of Period (in thousands)                 $ 82,962    $ 54,098    $ 25,315    $ 10,831    $  1,924    $    538
Average Net Assets for the Period (in thousands)         $ 68,129    $ 36,547    $ 17,889    $  5,556    $  1,636    $    497
Ratio of Gross Expenses to Average Net Assets*(2)           0.73%       0.75%       0.84%       1.07%         N/A         N/A
Ratio of Net Expenses to Average Net Assets*(2)             0.74%       0.75%       0.83%       1.00%       1.00%       1.00%
Ratio of Net Investment Income to Average Net Assets*       6.79%       6.90%       7.31%       7.46%       5.49%       3.77%
Portfolio Turnover Rate*                                     216%        119%        250%        236%        234%        508%
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
*Annualized for periods of less than one full year. 
**Total return not annualized for periods of less than one full year. 
(1) Period September 13, 1993, (inception) to December 31, 1993. 
(2) See footnote #5 in Notes to Financial Statements.

See Notes to Financial Statements.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   51
<PAGE>

                   FINANCIAL HIGHLIGHTS - INSTITUTIONAL SHARES
<TABLE>
<CAPTION>
For a share outstanding during the
six months ended June 30, 1998, 
(unaudited) or through each fiscal
year or period ended December 31                                       Janus Aspen Short-Term Bond Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
                                                            1998       1997       1996       1995       1994       1993(1)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>        <C>        <C>        <C>        <C>        <C>     
Net Asset Value, Beginning of Period                    $   8.88   $   9.97   $  10.03   $   9.72   $   9.93   $  10.00
- ------------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                               .20       1.85        .42        .60        .35        .11
  Net gains or (losses) on securities
   (both realized and unrealized)                            .05     (1.19)      (.03)        .31      (.26)      (.08)
- ------------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                             .25        .66        .39        .91        .09        .03
- ------------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                   (.29)     (1.75)      (.44)      (.60)      (.30)      (.10)
  Dividends (in excess of net investment income)              --         --         --         --         --         -- 
  Distributions (from capital gains)                       (.10)         --      (.01)         --         --         -- 
  Distributions (in excess of realized gains)                 --         --         --         --         --         -- 
  Tax return of capital                                       --         --         --         --         --         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                        (.39)     (1.75)      (.45)      (.60)      (.30)      (.10)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                          $   8.74   $   8.88   $   9.97   $  10.03   $   9.72   $   9.93
====================================================================================================================================
Total Return**                                             2.78%      6.72%      3.98%      9.54%      0.92%      0.30%
====================================================================================================================================
Net Assets, End of Period (in thousands)                $  4,292   $  2,735   $ 11,901   $  3,187   $  2,902   $    502
Average Net Assets for the Period (in thousands)        $  3,731   $ 12,407   $  7,168   $  2,727   $  1,774   $    492
Ratio of Gross Expenses to Average Net Assets*(3)          0.65%      0.65%      0.66%      0.70%        N/A        N/A
Ratio of Net Expenses to Average Net Assets*(3)            0.65%      0.65%      0.65%      0.65%      0.65%      0.65%
Ratio of Net Investment Income to Average Net Assets*      5.41%      5.83%      5.44%      6.02%      5.00%      3.57%
Portfolio Turnover Rate*                                    191%       204%       416%       417%       256%        91%
- ------------------------------------------------------------------------------------------------------------------------------------

<CAPTION>
For a share outstanding during the
six months ended June 30, 1998, 
(unaudited) or through each fiscal                        Janus Aspen Capital   Janus Aspen Equity      
year or period ended December 31                         Appreciation Portfolio  Income Portfolio                      
- ------------------------------------------------------------------------------------------------------------------------------------
                                                              1998     1997(2)      1998     1997(2)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                       <C>        <C>        <C>        <C>     
Net Asset Value, Beginning of Period                      $  12.62   $  10.00   $  13.46   $  10.00
- ------------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                                  --        .05         --        .01
  Net gains or (losses) on securities
   (both realized and unrealized)                             3.92       2.61       3.04       3.46
- ------------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                              3.92       2.66       3.04       3.47
- ------------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                        --      (.04)         --      (.01)
  Dividends (in excess of net investment income)                --         --         --         -- 
  Distributions (from capital gains)                            --         --      (.21)         -- 
  Distributions (in excess of realized gains)                   --         --         --         -- 
  Tax return of capital                                         --         --         --         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                             --      (.04)      (.21)      (.01)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                            $  16.54   $  12.62   $  16.29   $  13.46
====================================================================================================================================
Total Return**                                              31.08%     26.60%     22.61%     34.70%
====================================================================================================================================
Net Assets, End of Period (in thousands)                  $ 24,047   $  6,833   $  5,772   $  3,047
Average Net Assets for the Period (in thousands)          $ 14,035   $  2,632   $  4,773   $  1,101
Ratio of Gross Expenses to Average Net Assets*(3)            1.03%      1.26%      1.25%      1.25%
Ratio of Net Expenses to Average Net Assets*(3)              1.03%      1.25%      1.25%      1.25%
Ratio of Net Investment Income to Average Net Assets*           --      1.43%         --      0.35%
Portfolio Turnover Rate*                                       52%       101%       110%       128%
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
*Annualized for periods of less than one full year. 
**Total return not annualized for periods of less than one full year. 
(1) Period September 13, 1993, (inception) to December 31, 1993. 
(2) Period May 1, 1997, (inception) to December 31, 1997. 
(3) See footnote #5 in Notes to Financial Statements.

See Notes to Financial Statements.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   52
<PAGE>

                   FINANCIAL HIGHLIGHTS - INSTITUTIONAL SHARES
<TABLE>
<CAPTION>
For a share outstanding during the                      Janus Aspen 
six months ended June 30, 1998,                         Growth and           Janus Aspen 
(unaudited) or through each fiscal                         Income             High-Yield
year or period ended December 31                         Portfolio             Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
                                                           1998(1)      1998       1997     1996(2)                                 
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                      <C>        <C>        <C>        <C>                                       
Net Asset Value, Beginning of Period                     $  10.00   $  11.78   $  10.83   $  10.00                                  
- ------------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:                                                                                                  
  Net investment income/(loss)                                .01        .44        .70        .43                                  
  Net gains or (losses) on securities                                                                                               
   (both realized and unrealized)                             .55        .35        .99        .80                                  
- ------------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                              .56        .79       1.69       1.23                                  
- ------------------------------------------------------------------------------------------------------------------------------------
Less Distributions:                                                                                                                 
  Dividends (from net investment income)                       --      (.49)      (.68)      (.40)                                  
  Dividends (in excess of net investment income)               --         --         --         --                                  
  Distributions (from capital gains)                           --      (.21)      (.06)         --                                  
  Distributions (in excess of realized gains)                  --         --         --         --                                  
  Tax return of capital                                        --         --         --         --                                  
- ------------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                            --      (.70)      (.74)      (.40)                                  
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                           $  10.56   $  11.87   $  11.78   $  10.83                                  
====================================================================================================================================
Total Return**                                              5.60%      6.74%     15.98%     12.40%                                 
====================================================================================================================================
Net Assets, End of Period (in thousands)                 $  1,691   $  3,891   $  2,914   $    783                                  
Average Net Assets for the Period (in thousands)         $  1,033   $  3,769   $  1,565   $    459                                  
Ratio of Gross Expenses to Average Net Assets*(4)           1.25%      1.01%      1.00%      1.01%                                 
Ratio of Net Expenses to Average Net Assets*(4)             1.25%      1.00%      1.00%      1.00%                                 
Ratio of Net Investment Income to Average Net Assets*       0.75%      7.72%      7.98%      5.74%                                 
Portfolio Turnover Rate*                                     120%       412%       299%       301%                                 
- ------------------------------------------------------------------------------------------------------------------------------------

<CAPTION>
For a share outstanding during the 
six months ended June 30, 1998,
(unaudited) or through each fiscal 
year or period ended December 31                            Janus Aspen Money Market Portfolio                      
- ------------------------------------------------------------------------------------------------------------------------------------
                                                            1998       1997       1996     1995(3)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>        <C>        <C>        <C>     
Net Asset Value, Beginning of Period                    $   1.00   $   1.00   $   1.00   $   1.00
- ------------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                               .03        .05        .05        .04
  Net gains or (losses) on securities
   (both realized and unrealized)                             --         --         --         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                             .03        .05        .05        .04
- ------------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                   (.03)      (.05)      (.05)      (.04)
  Dividends (in excess of net investment income)              --         --         --         -- 
  Distributions (from capital gains)                          --         --         --         -- 
  Distributions (in excess of realized gains)                 --         --         --         -- 
  Tax return of capital                                       --         --         --         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                        (.03)      (.05)      (.05)      (.04)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                          $   1.00   $   1.00   $   1.00   $   1.00
====================================================================================================================================
Total Return**                                             2.63%      5.17%      5.05%      3.63%
====================================================================================================================================
Net Assets, End of Period (in thousands)                $ 26,066   $ 15,374   $  6,106   $  1,735
Average Net Assets for the Period (in thousands)        $ 25,881   $  8,926   $  3,715   $  1,543
Ratio of Gross Expenses to Average Net Assets*(4)          0.36%      0.50%      0.50%      0.50%
Ratio of Net Expenses to Average Net Assets*(4)            0.36%      0.50%      0.50%      0.50%
Ratio of Net Investment Income to Average Net Assets*      5.32%      5.17%      4.93%      5.30%
Portfolio Turnover Rate*                                     N/A        N/A        N/A        N/A
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
*Annualized for periods of less than one full year. 
**Total return not annualized for periods of less than one full year. 
(1) Period May 1, 1998, (inception) to June 30, 1998. 
(2) Period May 1, 1996, (inception) to December 31, 1996. 
(3) Period May 1, 1995, (inception) to December 31, 1995. 
(4) See footnote #5 in Notes to Financial Statements.

See Notes to Financial Statements.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   53
<PAGE>

                    FINANCIAL HIGHLIGHTS - RETIREMENT SHARES
<TABLE>
<CAPTION>
For a share outstanding during the                                               Janus Aspen            Janus Aspen
six months ended June 30, 1998,                             Janus Aspen           Aggressive              Capital
(unaudited) or through each fiscal                            Growth                Growth             Appreciation
year or period ended December 31                             Portfolio             Portfolio             Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
                                                            1998     1997(1)      1998     1997(1)      1998     1997(1)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>        <C>        <C>        <C>        <C>        <C>     
Net Asset Value, Beginning of Period                    $  18.46   $  16.18   $  20.49   $  16.12   $  12.62   $  10.00
- ------------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                                --        .04      (.10)      (.06)      (.03)        .12
  Net gains or (losses) on securities
   (both realized and unrealized)                           3.50       2.71       3.58       4.43       3.92       2.50
- ------------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                            3.50       2.75       3.48       4.37       3.89       2.62
- ------------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                      --      (.10)         --         --         --         -- 
  Distributions (from capital gains)                      (1.30)      (.37)         --         --         --         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                       (1.30)      (.47)         --         --         --         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                          $  20.66   $  18.46   $  23.97   $  20.49   $  16.51   $  12.62
====================================================================================================================================
Total Return**                                            18.93%     17.22%     16.98%     27.11%     30.82%     26.20%
====================================================================================================================================
Net Assets, End of Period (in thousands)                $     14   $     12   $     15   $     13   $     17   $     13
Average Net Assets for the Period (in thousands)        $     13   $     11   $     14   $     11   $     14   $     12
Ratio of Gross Expenses to Average Net Assets*(2)          1.17%      1.20%      1.26%      1.32%      1.54%      1.73%
Ratio of Net Expenses to Average Net Assets*(2)            1.16%      1.20%      1.26%      1.32%      1.53%      1.73%
Ratio of Net Investment Income to Average Net Assets*    (0.03%)     0.29%     (0.90%)    (0.62%)    (0.44%)      1.55%
Portfolio Turnover Rate*                                     76%       122%       124%       130%        52%       101%
- ------------------------------------------------------------------------------------------------------------------------------------

<CAPTION>
For a share outstanding during the                          Janus Aspen           Janus Aspen                    
six months ended June 30, 1998,                            International           Worldwide            Janus Aspen
(unaudited) or through each fiscal                            Growth                Growth               Balanced
year or period ended December 31                             Portfolio             Portfolio             Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
                                                            1998     1997(1)      1998     1997(1)      1998     1997(1)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>        <C>        <C>        <C>        <C>        <C>     
Net Asset Value, Beginning of Period                    $  18.44   $  16.80   $  23.36   $  20.72   $  17.47   $  15.38
- ------------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                               .08        .04        .06        .14        .16        .27
  Net gains or (losses) on securities
   (both realized and unrealized)                           3.95       1.73       6.18       2.80       2.84       2.30
- ------------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                            4.03       1.77       6.24       2.94       3.00       2.57
- ------------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                   (.01)      (.09)      (.02)      (.14)      (.08)      (.30)
  Distributions (from capital gains)                       (.27)      (.04)      (.87)      (.16)      (.49)      (.18)
- ------------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                        (.28)      (.13)      (.89)      (.30)      (.57)      (.48)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                          $  22.19   $  18.44   $  28.71   $  23.36   $  19.90   $  17.47
====================================================================================================================================
Total Return**                                            21.89%     10.53%     26.71%     14.22%     17.16%     16.92%
====================================================================================================================================
Net Assets, End of Period (in thousands)                $     13   $     11   $  1,122   $    403   $     14   $     12
Average Net Assets for the Period (in thousands)        $     12   $     11   $    640   $     11   $     13   $     11
Ratio of Gross Expenses to Average Net Assets*(2)          1.36%      1.45%      1.25%      1.26%      1.25%      1.32%
Ratio of Net Expenses to Average Net Assets*(2)            1.36%      1.45%      1.25%      1.26%      1.25%      1.32%
Ratio of Net Investment Income to Average Net Assets*      0.78%      0.26%      0.74%      0.16%      1.74%      2.38%
Portfolio Turnover Rate*                                     86%        86%        68%        80%       113%       139%
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
*Annualized for periods of less than one full year. 
**Total return not 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  JUNE 30, 1998  SEMIANNUAL REPORT   54
<PAGE>

                    FINANCIAL HIGHLIGHTS - RETIREMENT SHARES
<TABLE>
<CAPTION>
For a share outstanding during the                                                  Janus Aspen            
six months ended June 30, 1998,                                    Janus Aspen      Growth and      Janus Aspen
(unaudited) or through each fiscal                                Equity Income        Income     Flexible Income
year or period ended December 31                                    Portfolio        Portfolio       Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                   1998     1997(1)    1998(2)      1998     1997(1)               
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                            <C>        <C>        <C>        <C>        <C>                     
Net Asset Value, Beginning of Period                           $  13.42   $  10.00   $  10.00   $  11.77   $  11.41                
- ------------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:                                                                                                 
  Net investment income/(loss)                                    (.03)        .01        .01        .38        .50                
  Net gains or (losses) on securities                                                                                              
   (both realized and unrealized)                                  3.03       3.41        .54        .25        .58                
- ------------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                                   3.00       3.42        .55        .63       1.08                
- ------------------------------------------------------------------------------------------------------------------------------------
Less Distributions:                                                                                                                
  Dividends (from net investment income)                             --         --         --      (.33)      (.61)               
  Distributions (from capital gains)                              (.21)         --         --      (.11)      (.11)               
- ------------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                               (.21)         --         --      (.44)      (.72)               
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                                 $  16.21   $  13.42   $  10.55   $  11.96   $  11.77                
====================================================================================================================================
Total Return**                                                   22.37%     34.20%      5.50%      5.32%      9.73%
====================================================================================================================================
Net Assets, End of Period (in thousands)                       $     17   $     13   $     11   $     12   $     11
Average Net Assets for the Period (in thousands)               $     15   $     12   $     10   $     11   $     10
Ratio of Gross Expenses to Average Net Assets*(3)                 1.74%      1.74%      1.67%      1.25%      1.23%
Ratio of Net Expenses to Average Net Assets*(3)                   1.74%      1.74%      1.67%      1.24%      1.23%
Ratio of Net Investment Income to Average Net Assets*           (0.47)%      0.07%      0.50%      6.26%      6.39%
Portfolio Turnover Rate*                                           110%       128%       120%       216%       119%
- ------------------------------------------------------------------------------------------------------------------------------------

<CAPTION>
For a share outstanding during the                                                Janus Aspen           Janus Aspen
six months ended June 30, 1998,                             Janus Aspen           Short-Term              Money
(unaudited) or through each fiscal                          High-Yield               Bond                 Market
year or period ended December 31                             Portfolio             Portfolio             Portfolio
- ------------------------------------------------------------------------------------------------------------------------------------
                                                            1998     1997(1)      1998     1997(1)      1998     1997(1)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>        <C>        <C>        <C>        <C>        <C>     
Net Asset Value, Beginning of Period                    $  11.78   $  11.19   $   8.88   $  10.14   $   1.00   $   1.00
- ------------------------------------------------------------------------------------------------------------------------------------
Income from Investment Operations:
  Net investment income/(loss)                               .42        .59        .21        .56        .02        .03
  Net gains or (losses) on securities
   (both realized and unrealized)                            .34        .71        .02      (.11)         --         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Total from Investment Operations                             .76       1.30        .23        .45        .02        .03
- ------------------------------------------------------------------------------------------------------------------------------------
Less Distributions:
  Dividends (from net investment income)                   (.45)      (.65)      (.26)     (1.71)      (.02)      (.03)
  Distributions (from capital gains)                       (.21)      (.06)      (.10)         --         --         -- 
- ------------------------------------------------------------------------------------------------------------------------------------
Total Distributions                                        (.66)      (.71)      (.36)     (1.71)      (.02)      (.03)
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                          $  11.88   $  11.78   $   8.75   $   8.88   $   1.00   $   1.00
====================================================================================================================================
Total Return**                                             6.40%     11.96%      2.56%      4.53%      2.39%      3.13%
====================================================================================================================================
Net Assets, End of Period (in thousands)                $     12   $     11   $     11   $     10   $     11   $     10
Average Net Assets for the Period (in thousands)        $     12   $     11   $     11   $     10   $     10   $     10
Ratio of Gross Expenses to Average Net Assets*(3)          1.50%      1.50%      1.13%      1.20%      0.85%      1.00%
Ratio of Net Expenses to Average Net Assets*(3)            1.49%      1.50%      1.13%      1.19%      0.85%      1.00%
Ratio of Net Investment Income to Average Net Assets*      7.29%      7.42%      4.90%      5.43%      4.74%      4.66%
Portfolio Turnover Rate*                                    412%       299%       191%       204%        N/A        N/A
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
*Annualized for periods of less than one full year. 
**Total return not annualized for periods of less than one full year. 
(1) Period May 1, 1997, (inception) to December 31, 1997. 
(2) Period May 1, 1998, (inception) to June 30, 1998. 
(3) See footnote #5 in Notes to Financial Statements.

See Notes to Financial Statements.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   55
<PAGE>

                         NOTES TO FINANCIAL STATEMENTS

1.   Organization and Significant Accounting Policies

     Janus Aspen Series (the "Trust") was  organized as a Delaware  Trust on May
20, 1993, and is registered under the Investment  Company Act of 1940 (the "1940
Act") as a no-load,  open-end management investment company. The Trust offers 12
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.  Three Portfolios
invest  primarily in  income-producing  securities:  Janus Aspen Flexible Income
Portfolio,  Janus Aspen  High-Yield  Portfolio and Janus Aspen  Short-Term  Bond
Portfolio. Janus Aspen Money Market Portfolio invests in short-term money market
securities.  Each  Portfolio is diversified as defined in the 1940 Act, with the
exception of the Aggressive Growth Portfolio and Capital Appreciation Portfolio,
which are nondiversified.

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

     Organizational  costs for the Trust were borne by Janus Capital Corporation
(the Trust's  investment  adviser).  Effective May 1, 1998, the Trust issued one
new series of shares, the Janus Aspen Growth and Income Portfolio. Janus Capital
invested $10,000 of initial seed capital in the Portfolio.

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

Investment Valuation

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

Investment Transactions and Investment Income

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

Forward Currency Transactions and Futures Contracts

     The  Portfolios  enter into  forward  currency  contracts in order to hedge
their  exposure to changes in foreign  currency  exchange rates on their foreign
portfolio  holdings  and to lock in the U.S.  dollar cost of firm  purchase  and
sales commitments denominated in foreign currencies. A forward currency contract
is a  commitment  to purchase  or sell a foreign  currency at a future date at a
negotiated  forward rate. The gain or loss arising from the  difference  between
the U.S.  dollar  cost of the  original  contract  and the value of the  foreign
currency in U.S.  dollars upon closing such contract is included in net realized
gain or loss on foreign currency  transactions.  Forward currency contracts held
by the  Portfolios are fully covered 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.

     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.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   56
<PAGE>

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

     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 that the counterparty will fail to perform its obligations.

Additional Investment Risk

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

Estimates

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

Dividend Distributions and Expenses

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

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

Federal Income Taxes

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

2. Investment Advisery Agreement and Other Transactions With Affiliates

     Investment  advisery  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  advisery
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 advisery 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  advisery  fees are reduced to the  effective
rates of Janus Fund,  Janus  Enterprise Fund, Janus Olympus Fund, Janus Overseas
Fund, Janus Worldwide Fund, Janus Balanced Fund, Janus Equity Income Fund, Janus
Growth and Income Fund  respectively.  The effective rate for each Portfolio for
the period ended June 30, 1998, was .65%,  .72%,  .70%,  .66%, .65%, .72%, .75%,
and .66%  respectively.  The Flexible  Income and Short-Term Bond Portfolios are
each subject to advisery  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 advisery fee rate
is payable at rates of .75% of the first $300 million of average net assets plus
 .65% of  average  net  assets  in  excess  of $300  million.  The  Money  Market
Portfolio's  advisery  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.

     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;  .65% of the average net assets of the  Short-Term  Bond
Portfolio;  and .50% of the average net assets of the Money Market Portfolio for
a fiscal year.

     Janus  Capital may  terminate  any of these fee waivers or reductions on at
least 90 days notice to the Trustees.  The  participant  administration  fee and
distribution  fee applicable to the Retirement  Shares are not included in these
expense limits.

     Until at least May 1, 1999, Janus Capital has also agreed to reduce its fee
to the extent that normal  operating  expenses  exceed  1.25% of the average net
assets of the  Capital  Appreciation,  Equity  Income,  and  Growth  and  Income
Portfolios.

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

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   57
<PAGE>

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

     DST Systems,  Inc. (DST), an affiliate of Janus Capital through a degree of
common ownership, provides accounting systems to the Portfolios. DST Securities,
Inc., a wholly owned subsidiary of DST, provides  brokerage  services on certain
portfolio transactions. Brokerage commissions paid to DST Securities, Inc. serve
to reduce fees and expenses.  Brokerage  commissions paid, fees reduced, and the
net fees paid to DST for the period ended June 30, 1998, are noted below:

<TABLE>
<CAPTION>
                                          DST Securities, Inc. Portfolio Expense  DST Systems
Portfolio                                  Commissions Paid*      Reduction*         Costs
- ---------------------------------------------------------------------------------------------
<S>                                             <C>                 <C>             <C>
Janus Aspen Growth Portfolio                        --                  --          $ 8,107
- ---------------------------------------------------------------------------------------------
Janus Aspen Aggressive Growth Portfolio         $9,626              $7,219              638
- ---------------------------------------------------------------------------------------------
Janus Aspen Capital Appreciation Portfolio          --                  --            3,536
- ---------------------------------------------------------------------------------------------
Janus Aspen International Growth Portfolio          --                  --            5,535
- ---------------------------------------------------------------------------------------------
Janus Aspen Worldwide Growth Portfolio              --                  --           10,015
- ---------------------------------------------------------------------------------------------
Janus Aspen Balanced Portfolio                      --                  --            6,986
- ---------------------------------------------------------------------------------------------
Janus Aspen Equity Income Portfolio                  7                   5            2,069
- ---------------------------------------------------------------------------------------------
Janus Aspen Growth and Income Portfolio             --                  --               --
- ---------------------------------------------------------------------------------------------
Janus Aspen Flexible Income Portfolio               --                  --            4,771
- ---------------------------------------------------------------------------------------------
Janus Aspen High-Yield Portfolio                    --                  --            3,119
- ---------------------------------------------------------------------------------------------
Janus Aspen Short-Term Bond Portfolio               --                  --            3,150
- ---------------------------------------------------------------------------------------------
Janus Aspen Money Market Portfolio                  --                  --            4,654
- ---------------------------------------------------------------------------------------------
</TABLE>
*The difference  between  commissions paid to DST Securities,  Inc. and expenses
reduced constituted commissions paid to an unaffiliated clearing broker.

3. Federal Income Tax

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

     The  aggregate  cost of  investments  and  the  composition  of  unrealized
appreciation  and depreciation of investments for federal income tax purposes as
of June 30, 1998, are also noted below.

<TABLE>
<CAPTION>
                                                                             at June 30, 1998
                                        --------------------------------------------------------------------------------------------
                                        Net Capital Loss  Post-October   Federal Tax    Unrealized     Unrealized  Net Appreciation/
Portfolio                                   Carryovers      Losses          Cost       Appreciation  (Depreciation) (Depreciation)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                        <C>           <C>           <C>             <C>           <C>            <C>         
Janus Aspen Growth Portfolio                        --   ($   336,826) $  655,842,669  $190,997,125  ($10,430,925)  $180,566,200
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen Aggressive Growth Portfolio    ($9,224,354)            --     475,310,502   168,154,487    (7,169,649)   160,984,838
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen Capital Appreciation Portfolio     (25,613)      (120,295)     18,518,670     4,688,732      (223,162)     4,465,570
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen International Growth Portfolio          --     (2,607,314)    218,915,459    52,594,308    (5,548,749)    47,045,559
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen Worldwide Growth Portfolio              --    (17,297,533)  1,926,436,817   628,020,226   (29,559,965)   598,460,261
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen Balanced Portfolio                      --             --     484,221,405    82,987,391    (3,894,296)    79,093,095
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen Equity Income Portfolio                 --         (2,372)      4,823,780     1,027,101       (89,730)       937,371
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen Growth and  Income Portfolio            --             --       1,683,968       104,637       (27,512)        77,125
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen Flexible Income Portfolio               --             --      79,126,410     1,804,856      (160,832)     1,644,024
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen High-Yield Portfolio                    --             --       3,859,500        79,699       (30,615)        49,084
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen Short-Term Bond Portfolio               --             --       4,219,766         8,503        (3,110)         5,393
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen Money Market Portfolio                  --             --      27,903,425            --            --             --
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   58
<PAGE>

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

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 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.

     For the six months or period  ended June 30,  1998  (unaudited)  or through
each fiscal year or period ended December 31

<TABLE>
<CAPTION>
                                                                 Institutional Shares                            Retirement Shares
Portfolio                                     1998     1997        1996        1995        1994        1993(6)    1998     1997(2)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                           <C>      <C>         <C>         <C>         <C>         <C>        <C>      <C>  
Janus Aspen Growth Portfolio                  0.74%    0.78%       0.83%       0.98%       1.23%       2.16%      1.26%    1.28%
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen Aggressive Growth Portfolio       0.76%    0.78%       0.83%       0.93%       1.14%       5.79%      1.29%    1.34%
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen Capital Appreciation Portfolio    1.08%    2.19%(2)     N/A         N/A         N/A         N/A       1.58%    2.66%
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen International Growth Portfolio    0.96%    1.08%       2.21%       3.57%       4.67%(5)     N/A       1.45%    1.57%
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen Worldwide Growth Portfolio        0.74%    0.81%       0.91%       1.09%       1.49%       2.71%      1.35%    1.32%
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen Balanced Portfolio                0.76%    0.83%       1.07%       1.55%       1.74%       7.92%      1.27%    1.33%
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen Equity Income Portfolio           1.62%    5.75%(2)     N/A         N/A         N/A         N/A       2.10%    6.19%
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen Growth and Income Portfolio(1)    5.70%     N/A         N/A         N/A         N/A         N/A       6.12%     N/A
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen Flexible Income Portfolio         0.74%    0.75%       0.84%       1.07%       1.35%       5.27%      1.25%    1.23%
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen High-Yield Portfolio              2.13%    3.27%       6.29%(3)     N/A         N/A         N/A       2.62%    3.42%
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen Short-Term Bond Portfolio         1.38%    0.91%       0.84%       1.37%       1.40%       5.33%      1.86%    1.49%
- ------------------------------------------------------------------------------------------------------------------------------------
Janus Aspen Money Market Portfolio            0.36%    0.55%       0.78%       1.07%(4)     N/A         N/A       0.85%    1.10%
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
(1) Period May 1, 1998, (inception) to June 30, 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.
(5) Period May 2, 1994, (inception) to December 31, 1994.
(6) Period September 13, 1993, (inception) to December 31, 1993.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   59
<PAGE>

              This space reserved for your notes and computations.

            JANUS ASPEN SERIES  JUNE 30, 1998  SEMIANNUAL REPORT   60
<PAGE>

                                  [LOGO] JANUS

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

     Retirement Shares distributed by Janus Distributors, Inc. Member NASD



© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission