JANUS ASPEN SERIES
497, 1997-10-06
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Janus Aspen Series

Money Market Portfolio

Prospectus

[Logo]    Janus

<PAGE>

Contents
- ---------------------------------------
THE PORTFOLIO AT A GLANCE
Brief description of the Portfolio .. 1
- ---------------------------------------
EXPENSE INFORMATION
The Portfolio's annual
   operating expenses ............... 1
Financial Highlights -
   a summary of financial data ...... 2
- ---------------------------------------
PERFORMANCE TERMS
An explanation of performance terms . 3
- ---------------------------------------
THE PORTFOLIO IN DETAIL
Investment Objective and Policies ... 4
Investment Policies ................. 4
Types of Investments ................ 4
- ---------------------------------------
MANAGEMENT OF THE PORTFOLIO
Investment Adviser and
   Investment Personnel ............. 7
Management Expenses ................. 8
Portfolio Transactions .............. 8
Other Service Providers ............. 8
Other Information ................... 8
- ---------------------------------------
DISTRIBUTIONS AND TAXES
Distributions ...................... 10
Taxes .............................. 10
- ---------------------------------------
SHAREHOLDER'S GUIDE
Purchases .......................... 11
Redemptions ........................ 11
Shareholder Communications ......... 11


                               Janus Aspen Series
                             Money Market Portfolio

                                   Prospectus

                                   May 1, 1997

Money Market  Portfolio  (the  "Portfolio")  is a money market  mutual fund that
seeks  maximum  current  income to the extent  consistent  with the stability of
capital.  The  Portfolio  pursues its  objective by investing  primarily in high
quality debt obligations and obligations of financial institutions.

The  Portfolio  is a series of Janus Aspen Series (the  "Trust")  and  currently
offers two classes of shares.  The Trust is registered  with the  Securities and
Exchange  Commission ("SEC") as an open-end management  investment company.  The
Institutional  Shares  of the  Portfolio  (the  "Shares")  are  offered  by this
prospectus 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.  The
Institutional  Shares are sold under the name "Janus  Aspen  Series."  The Trust
sells and  redeems  its Shares at net asset  value  without  any sales  charges,
commissions or redemption fees. Each variable  insurance  contract involves fees
and expenses not described in this  Prospectus.  See the  accompanying  contract
prospectus  for  information  regarding  contract  fees  and  expenses  and  any
restrictions on purchases or allocations.

This  Prospectus  contains  information  about  the  Shares  that a  prospective
purchaser of a variable  insurance  contract or plan participant should consider
before allocating  purchase payments or premiums to the Portfolio.  It should be
read  carefully in  conjunction  with the  separate  account  prospectus  of the
specific  insurance  product that  accompanies  this Prospectus and retained for
future  reference.  Additional  information  about the Shares is  contained in a
Statement of  Additional  Information  ("SAI") filed with the SEC. The SAI dated
May 1, 1997 is incorporated by reference into this Prospectus. Copies of the SAI
are  available  upon  request  and  without  charge by writing  or calling  your
insurance company or plan sponsor.

AN INVESTMENT IN THE MONEY MARKET PORTFOLIO IS NEITHER INSURED NOR GUARANTEED BY
THE U.S. GOVERNMENT.  THERE IS NO ASSURANCE THAT THE MONEY MARKET PORTFOLIO WILL
BE ABLE TO MAINTAIN A STABLE NET ASSET VALUE OF $1.00 PER SHARE.

THESE SECURITIES HAVE NOT BEEN APPROVED BY THE SEC NOR HAS THE SEC PASSED ON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

This  Prospectus does not constitute an offer to sell securities in any state or
other jurisdiction to any person to whom it is unlawful to make such an offer in
such state or other jurisdiction.

<PAGE>

Portfolio At A Glance

This section is designed to provide you with a brief  overview of the  Portfolio
and its  investment  emphasis.  A more detailed  discussion  of the  Portfolio's
investment objective and policies begins on page 4.

INVESTMENT OBJECTIVE:

The investment  objective of the Portfolio is to seek maximum  current income to
the extent consistent with the stability of capital.

PRIMARY HOLDINGS:

The Portfolio seeks to achieve this investment  objective by investing primarily
in high quality debt obligations and obligations of financial institutions.

SHAREHOLDER'S INVESTMENT HORIZON:

The Portfolio is designed for investors who seek maximum  current  income to the
extent consistent with the stability of capital.

FUND ADVISER:

Janus Capital Corporation ("Janus Capital") serves as the Portfolio's investment
adviser.  Janus Capital has been in the investment advisory business for over 26
years and currently manages approximately $50 billion in assets.

PORTFOLIO MANAGER:

Sharon S. Pichler

PORTFOLIO INCEPTION:

May 1995

Expense Information

The tables and example  below are designed to assist  participants  in qualified
plans that invest in the Shares of the  Portfolio in  understanding  the various
costs and expenses  that you will bear  directly or indirectly as an investor in
the Shares.  Owners of variable  insurance  contracts  that invest in the Shares
should refer to the variable insurance contract  prospectus for a description of
costs and expenses,  as the tables and example do not reflect  deductions at the
separate  account  level or contract  level for any charges that may be incurred
under a contract.


SHAREHOLDER TRANSACTION EXPENSES

     Maximum sales load imposed on purchases                             None
     Maximum sales load imposed on reinvested dividends                  None
     Deferred sales charges on redemptions                               None
     Redemption fee                                                      None
     Exchange fee                                                        None


ANNUAL OPERATING EXPENSES (after fee waivers)(1)
(expressed as a percentage of average net assets)
- --------------------------------------------------------------------------------
Management Fee                             0.00%
Other Expenses                             0.50%
- --------------------------------------------------------------------------------
Total Operating Expenses                   0.50%
- --------------------------------------------------------------------------------
(1)  The fees and  expenses  in the table  above are  based on  expenses  of the
     Shares for the fiscal year ended December 31, 1996. The  information is net
     of fee waivers from Janus  Capital.  Fee waivers are applied  first against
     the management fee and then against other  expenses.  Without such waivers,
     the Management  Fee, Other  Expenses and Total  Operating  Expenses for the
     Shares would have been 0.25%, 0.53% and 0.78%, respectively.  Janus Capital
     may  modify or  terminate  the  waivers  at any time upon at least 90 days'
     notice to the Trustees.

EXAMPLE
                                        1 Year    3 Years     5 Years   10 Years
- --------------------------------------------------------------------------------
You would indirectly pay the following
expenses  on   a  $1,000   investment,
assuming  an  expense  ratio as listed
above and assuming a 5%  annual return
with or  without redemption at the end
of each period.                           $5        $16         $28        $63
- --------------------------------------------------------------------------------
THE EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION  OF PAST OR FUTURE RETURNS
OR EXPENSES WHICH MAY BE MORE OR LESS THAN THOSE SHOWN.

JANUS ASPEN SERIES MONEY MARKET PORTFOLIO PROSPECTUS          MAY 1, 1997      1

<PAGE>

Financial Highlights

Unless otherwise  noted,  the information  below is for fiscal periods ending on
December  31 of each  year.  The  accounting  firm of Price  Waterhouse  LLP has
audited the Portfolio's  financial statements since its inception.  Their report
is included in the Portfolio's Annual Report, which is incorporated by reference
into the SAI. A detailed explanation of the Financial Highlights can be found
on page 3.

<TABLE>
<CAPTION>
                                                                            1996             1995(1)
- ----------------------------------------------------------------------------------------------------
<S>                                                                        <C>               <C>  
 1. Net asset value, beginning of period                                   $1.00             $1.00
- ----------------------------------------------------------------------------------------------------
    Income from investment operations:
 2. Net investment income                                                    .05               .04
 3. Net gains or (losses) on securities (both realized and unrealized)        --                --
- ----------------------------------------------------------------------------------------------------
 4. Total from investment operations                                         .05               .04
- ----------------------------------------------------------------------------------------------------
    Less distributions:
 5. Dividends (from net investment income)                                  (.05)             (.04)
 6. Tax return of capital distributions                                      --                 --
- ----------------------------------------------------------------------------------------------------
 7. Total distributions                                                     (.05)             (.04)
- ----------------------------------------------------------------------------------------------------
 8. Net asset value, end of period                                         $1.00             $1.00
- ----------------------------------------------------------------------------------------------------
 9. Total return*                                                          5.05%             3.63%
- ----------------------------------------------------------------------------------------------------
10. Net assets, end of period (in thousands)                              $6,016            $1,735
11. Ratio of expenses to average net assets                                0.50%(3)          0.50%(2)
12. Ratio of net investment income to average net assets**                 4.93%             5.30%
- ----------------------------------------------------------------------------------------------------
</TABLE>
 * Total return not annualized for periods of less than one year.
** Annualized for periods of less than one full year.
(1) May 1, 1995 (inception) to December 31, 1995.
(2) The ratio was 1.07% before waiver of certain fees incurred by the Portfolio.
(3) The ratio was 0.78% before waiver of certain fees incurred by the Portfolio.

JANUS ASPEN SERIES MONEY MARKET PORTFOLIO PROSPECTUS          MAY 1, 1997      2

<PAGE>

Understanding the Financial Highlights

This  section  is  designed  to  help  you  better  understand  the  information
summarized in the  Financial  Highlights  table.  The table  contains  important
historical  operating  information  that may be useful in making your investment
decision or  understanding  how your  investment has performed.  The Portfolio's
Annual Report contains additional information about the Portfolio's performance,
including a comparison to an appropriate  securities index. To request a copy of
the Annual Report, please call or write your insurance company.

Net asset value ("NAV") is the value of a single Share of the  Portfolio.  It is
computed  by adding the value of all of the  Portfolio's  investments  and other
assets,  subtracting  any  liabilities  and dividing the result by the number of
shares outstanding. The NAV of the Portfolio's Shares is expected to be $1.00.

Net investment  income is the per share amount of dividends and interest  income
earned on securities held by the Portfolio,  less Portfolio expenses.  Dividends
(from net  investment  income) are the per share amount that the Portfolio  paid
from net investment income.

Net gains or (losses)  on  securities  is the per share  increase or decrease in
value of the securities  the Portfolio  holds. A gain (or loss) is realized when
securities are sold. A gain (or loss) is unrealized when securities  increase or
decrease in value but are not sold.  Distributions  (from capital gains) are the
per share amount that the Portfolio paid from net realized gains.

Total  Return  is  the  percentage  increase  or  decrease  in the  value  of an
investment  over a stated period of time. For the purposes of calculating  total
return, it is assumed that dividends and distributions are reinvested at the NAV
on the day of the distribution.  THE PORTFOLIO'S TOTAL RETURN CANNOT BE COMPUTED
DIRECTLY FROM THE FINANCIAL HIGHLIGHTS TABLE.

Ratio of  expenses  to  average  net  assets  is the  total  of the  Portfolio's
operating expenses divided by its average net assets for the stated period.

Ratio of net  investment  income to average  net assets is the  Portfolio's  net
investment income divided by its average net assets for the stated period.

- --------------------------------------------------------------------------------
Performance Terms

This section will help you  understand  various  terms that are commonly used to
describe the Portfolio's  performance.  You may see references to these terms in
our newsletters or advertisements (or those published by participating insurance
companies) and in media  articles.  Newsletters and  advertisements  may include
comparisons of the  Portfolio's  performance to the  performance of other mutual
funds,  mutual fund averages or recognized  stock market indices.  The Portfolio
generally measures performance in terms of yield. 

Yield shows the rate of income the Shares earn on investments as a percentage of
the Share price. It is calculated by dividing net investment income for a 30-day
period (7-day period for the Portfolio) by the average number of Shares entitled
to receive dividends and dividing the result by the Share's NAV per share at the
end of the 30-day period. Yield does not include changes in NAV.

Yields are calculated  according to standardized  SEC formulas and may not equal
the income on an investor's  account.  Yield is usually  quoted on an annualized
basis. An annualized  yield represents the amount you would earn if you remained
in a Portfolio for a year and the Shares of that Portfolio continued to have the
same yield for the entire year.

Effective  yield is similar to yield in that it is calculated over the same time
frame, but instead the net investment  income is compounded and then annualized.
Due to the compounding  effect, the effective yield will normally be higher than
the yield.

The  Portfolio  imposes  no sales or  other  charges  that  would  affect  yield
computations.  The Portfolio's yield figures include the effect of deducting the
Portfolio's  expenses,  but may not include charges and expenses attributable to
any particular insurance product.  Portfolio  performance figures are based upon
historical  results  and  are  not  intended  to  indicate  future  performance.
Investment  returns  and net asset value will  fluctuate  so that  shares,  when
redeemed, may be worth more or less than their original cost.

JANUS ASPEN SERIES MONEY MARKET PORTFOLIO PROSPECTUS          MAY 1, 1997      3

<PAGE>

The Portfolio in Detail

This  section  takes a  closer  look at the  Portfolio's  investment  objective,
policies and the  securities in which it invests.  Please  carefully  review the
"Additional  Risk  Factors"  section  of  this  Prospectus  for a more  detailed
discussion  of the risks  associated  with certain  investment  techniques.  You
should carefully consider your investment goals, time horizon and risk tolerance
before investing in the Portfolio.

The Portfolio's  investment objective and policies are similar to those of Janus
Money  Market  Fund,  a retail  fund  managed by Janus  Capital.  Although it is
anticipated  that the  Portfolio  and Janus Money  Market Fund will hold similar
securities,  differences  in  asset  size  and  cash  flow  needs as well as the
relative  weightings  of  securities  selections  may result in  differences  in
investment  performance.  Expenses of the  Portfolio and Janus Money Market Fund
are  expected to differ.  The  variable  contract  owner will also bear  various
insurance-related  costs at the insurance  company level.  You should review the
accompanying  separate  account  prospectus  for a summary of contract  fees and
expenses.

Policies that are noted as "fundamental" cannot be changed without a shareholder
vote. All other policies,  including the Portfolio's  investment objective,  are
not  fundamental  and may be  changed  by the  Portfolio's  Trustees  without  a
shareholder vote. You will be notified of any such changes that are material. If
there is a material change in the Portfolio's objective or policies,  you should
consider  whether  the  Portfolio  remains an  appropriate  investment  for your
variable insurance contract or qualified retirement plan.
- --------------------------------------------------------------------------------
The  Portfolio is designed for  investors  who  primarily  seek maximum  current
income to the extent consistent with stability of capital.

MONEY MARKET PORTFOLIO

INVESTMENT OBJECTIVE

The  Portfolio's  investment  objective is to seek maximum current income to the
extent consistent with stability of capital.  There can be no assurance that the
Portfolio will achieve its investment  objective or be able to maintain a stable
net asset value of $1.00 per share.

INVESTMENT POLICIES

The Portfolio will invest only in eligible high quality, short-term money market
instruments  that present  minimal credit risks, as determined by Janus Capital,
the  Portfolio's  investment  adviser,  pursuant  to  procedures  adopted by the
Trustees. The Portfolio may invest only in U.S.  dollar-denominated  instruments
that have a remaining  maturity of 397 days or less (as  calculated  pursuant to
Rule 2a-7  under the  Investment  Company  Act of 1940  ("1940  Act"))  and will
maintain a dollar-weighted average portfolio maturity of 90 days or less.

Except  to the  limited  extent  permitted  by Rule  2a-7  and  except  for U.S.
Government  Securities  (as defined  below),  the Portfolio will not invest more
than 5% of its total assets in the securities of any one issuer.  A guarantor is
not considered an issuer for the purpose of this limit,  provided that the value
of all  securities  held by the Portfolio  that are issued or guaranteed by that
institution shall not exceed 10% of the Portfolio's total assets.  The Portfolio
may not invest  more than 25% of its total  assets in any one  industry,  except
that this limit does not apply to U.S. Government  Securities,  bank obligations
or municipal  securities.  To ensure adequate  liquidity,  the Portfolio may not
invest  more  than  10% of its net  assets  in  illiquid  securities,  including
repurchase  agreements  maturing  in more than seven days  (unless  subject to a
demand  feature) and certain time deposits that are subject to early  withdrawal
penalties  and mature in more than seven  days.  Janus  Capital  determines  and
monitors the  liquidity of portfolio  securities  under the  supervision  of the
Trustees.

Ratings
High quality money market  instruments  include those that (i) are rated (or, if
unrated,  are issued by an issuer with  comparable  outstanding  short-term debt
that is rated) in one of the two highest rating  categories for short-term  debt
by any two nationally recognized statistical rating organizations ("NRSROs") or,
if only one  NRSRO  has  issued a rating,  by that  NRSRO or (ii) are  otherwise
unrated  and  determined  by Janus  Capital  to be of  comparable  quality.  The
Portfolio  will  invest at least 95% of its total  assets in  securities  in the
highest rating category (as determined  pursuant to Rule 2a-7).  Descriptions of
the rating  categories of Standard & Poor's,  Moody's,  and certain other NRSROs
are  contained  in the  SAI,  as is a  further  description  of the  Portfolio's
investment policies.

Although the Portfolio only invests in high quality money market instruments, an
investment  in the  Portfolio is subject to risk even if all  securities  in its
portfolio are paid in full at maturity. All money market instruments,  including
U.S.  Government  Securities,  can  change  in value as a result of  changes  in
interest  rates,  the  issuer's  actual  or  perceived  creditworthiness  or the
issuer's ability to meet its obligations.

TYPES OF INVESTMENTS

The Portfolio pursues its objective by investing  primarily in high quality debt
obligations  and  obligations of financial  institutions.  It may invest in U.S.
Government Securities (as defined below) and municipal securities,  although the
Portfolio expects to invest in such securities to a lesser degree.

Debt Obligations
The  Portfolio may invest in debt  obligations  of domestic  issuers,  including
commercial  paper  (short-term  promissory  notes issued by companies to finance
their, or their affiliates', current obligations), notes and bonds, and variable
amount master demand notes. The payment  obligations on these instruments may be
backed by securities, swap agreements or other assets, by a guarantee of a third
party or solely by the  unsecured  promise of the issuer to make  payments  when
due. The  Portfolio  may invest in privately  issued  commercial  paper or other
securities  that are restricted as to disposition  under the federal  securities
laws. In general,  sales of these securities may not be made absent registration
under the  Securities  Act of 1933 (the "1933  Act") or the  availability  of an
appropriate exemption

JANUS ASPEN SERIES MONEY MARKET PORTFOLIO PROSPECTUS          MAY 1, 1997      4

<PAGE>

therefrom.  Pursuant to Section 4(2) of the 1933 Act or Rule 144A adopted  under
the 1933 Act,  however,  some of these  securities  are  eligible  for resale to
institutional  investors,  and  accordingly,  Janus Capital may determine that a
liquid market exists for such a security  pursuant to guidelines  adopted by the
Trustees.

Obligations of Financial Institutions
The Portfolio may invest in obligations of financial  institutions.  Examples of
obligations in which it may invest include  negotiable  certificates of deposit,
bankers' acceptances and time deposits of U.S. banks (including savings and loan
associations)  having  total  assets in excess of one  billion  dollars and U.S.
branches of foreign banks having total assets in excess of ten billion  dollars.
The  Portfolio  may also invest in  Eurodollar  and Yankee bank  obligations  as
discussed below.

Certificates  of deposit  represent an  institution's  obligation to repay funds
deposited  with it that earn a  specified  interest  rate  over a given  period.
Bankers'  acceptances are negotiable  obligations of a bank to pay a draft which
has been drawn by a customer  and are usually  backed by goods in  international
trade. Time deposits are non-negotiable deposits with a banking institution that
earn a specified interest rate over a given period.  Fixed time deposits,  which
are  payable at the  stated  maturity  date and bear a fixed  rate of  interest,
generally  may be  withdrawn  on demand by the  Portfolio  but may be subject to
early withdrawal penalties that could reduce the Portfolio's yield. Unless there
is a readily  available market for them, time deposits that are subject to early
withdrawal  penalties and that mature in more than seven days will be treated as
illiquid securities.

Eurodollar or Yankee Obligations
The Portfolio may invest in Eurodollar and Yankee bank  obligations.  Eurodollar
bank obligations are dollar-denominated certificates of deposit or time deposits
issued outside the U.S. capital markets by foreign branches of U.S. banks and by
foreign banks. Yankee bank obligations are dollar-denominated obligations issued
in the U.S. capital markets by foreign banks.

Eurodollar  (and to a limited  extent,  Yankee) bank  obligations are subject to
certain  sovereign  risks.  One  such  risk is the  possibility  that a  foreign
government  might  prevent  dollar-denominated  funds  from  flowing  across its
borders.  Other risks include:  adverse political and economic developments in a
foreign  country;  the extent and quality of government  regulation of financial
markets and  institutions;  the  imposition of foreign  withholding  taxes;  and
expropriation or nationalization of foreign issuers.

U.S. Government Securities
The  Portfolio  may invest  without limit in U.S.  Government  Securities.  U.S.
Government Securities shall have the meaning set forth in the 1940 Act. The 1940
Act  defines  U.S.  Government   Securities  to  include  securities  issued  or
guaranteed  by the U.S.  government,  its agencies and  instrumentalities.  U.S.
Government Securities may also include repurchase  agreements  collateralized by
and  municipal  securities  escrowed  with  or  refunded  with  U.S.  Government
Securities. U.S. Government Securities in which the Portfolio may invest include
U.S. Treasury securities and obligations issued or guaranteed by U.S. government
agencies and  instrumentalities  that are backed by the full faith and credit of
the  U.S.   government,   such  as  those   guaranteed  by  the  Small  Business
Administration  or issued by the Government  National Mortgage  Association.  In
addition,  U.S. Government  Securities in which the Portfolio may invest include
securities  supported primarily or solely by the creditworthiness of the issuer,
such as securities of the Federal  National  Mortgage  Association,  the Federal
Home Loan Mortgage  Corporation and the Tennessee Valley Authority.  There is no
guarantee  that the U.S.  government  will support  securities not backed by its
full faith and credit. Accordingly,  although these securities have historically
involved little risk of loss of principal if held to maturity,  they may involve
more  risk than  securities  backed  by the full  faith  and  credit of the U.S.
government.

Municipal Securities
The municipal  securities in which the  Portfolio may invest  include  municipal
notes and  short-term  municipal  bonds.  Municipal  notes are generally used to
provide for the issuer's  short-term capital needs and generally have maturities
of 397 days or less. The Portfolio may also invest in high quality participation
interests in municipal securities.  A more detailed description of various types
of municipal securities is contained in Appendix B in the SAI.

Yields on municipal securities are dependent on a variety of factors,  including
the  general  conditions  of the  money  market  and of the  municipal  bond and
municipal note markets, the size of a particular  offering,  the maturity of the
obligation  and the rating of the  issue.  Obligations  of issuers of  municipal
securities  are subject to the  provisions of  bankruptcy,  insolvency and other
laws  affecting  the rights and remedies of  creditors,  such as the  Bankruptcy
Reform Act of 1978, as amended.  Therefore,  the  possibility  exists that, as a
result of litigation or other conditions, the ability of any issuer to pay, when
due, the principal of and interest on its municipal securities may be materially
affected.

Participation Interests
The Portfolio may invest in  participation  interests in any type of security in
which the Portfolio may invest.  A  participation  interest gives a Portfolio an
undivided  interest in the  underlying  securities  in the  proportion  that the
Portfolio's  participation  interest bears to the total principal  amount of the
underlying securities.  Participation  interests usually carry a demand feature,
as described below, backed by a letter of credit or guarantee of the institution
that  issued the  interests  permitting  the  holder to tender  them back to the
institution.

Demand Features
The  Portfolio  may invest in  securities  that are subject to puts and stand-by
commitments

JANUS ASPEN SERIES MONEY MARKET PORTFOLIO PROSPECTUS          MAY 1, 1997      5

<PAGE>

("demand  features").  Demand  features  give the  Portfolio the right to resell
securities at specified  periods prior to their  maturity dates to the seller or
to some third party at an  agreed-upon  price or yield.  Securities  with demand
features may involve certain expenses and risks,  including the inability of the
issuer of the instrument to pay for the securities at the time the instrument is
exercised,  non-marketability  of the  instrument  and  differences  between the
maturity  of the  underlying  security  and  the  maturity  of  the  instrument.
Securities may cost more with demand features than without them. Demand features
can serve three purposes: to shorten the maturity of a variable or floating rate
security,  to enhance the instrument's credit quality and to provide a source of
liquidity.   Demand   features  are  often  issued  by  third  party   financial
institutions,  generally  domestic and foreign  banks.  Accordingly,  the credit
quality and liquidity of the Portfolio's investments may be dependent in part on
the credit quality of the banks supporting its investments.  This will result in
exposure to risks  pertaining  to the banking  industry,  including  the foreign
banking industry.  Brokerage firms and insurance  companies also provide certain
liquidity and credit support.

Variable and Floating Rate Securities
The  securities  in which the  Portfolio  invests may have  variable or floating
rates of  interest.  These  securities  pay  interest at rates that are adjusted
periodically  according to a specified  formula,  usually with reference to some
interest rate index or market interest rate. Securities with ultimate maturities
of greater than 397 days may be purchased only pursuant to Rule 2a-7. Under that
Rule,  only those long-term  instruments  that have demand features which comply
with certain  requirements and certain variable rate U.S. Government  Securities
may be purchased. Similar to fixed rate debt instruments,  variable and floating
rate  instruments  are  subject to  changes in value  based on changes in market
interest rates or changes in the issuer's or guarantor's  creditworthiness.  The
rate  of  interest  on  securities  purchased  by the  Portfolio  may be tied to
short-term Treasury or other government securities or indices on securities that
are  permissible  investments  of the  Portfolio,  as well as other money market
rates of interest.  The Portfolio will not purchase  securities whose values are
tied to interest rates or indicies that are not appropriate for the duration and
volatility standards of a money market fund.

Mortgage- and Asset-Backed Securities
The Portfolio may purchase fixed or adjustable rate  mortgage-backed  securities
issued  by  the  Government  National  Mortgage  Association,  Federal  National
Mortgage  Association  or the Federal Home Loan Mortgage  Corporation,  or other
governmental  or  government-related  entities.  In addition,  the Portfolio may
purchase  other  asset-backed   securities,   including   securities  backed  by
automobile loans, equipment leases or credit card receivables.  These securities
directly  or  indirectly  represent  a  participation  in, or are secured by and
payable  from,  fixed or  adjustable  rate  mortgage or other loans which may be
secured by real estate or other assets.  Unlike  traditional  debt  instruments,
payments on these  securities  include both  interest  and a partial  payment of
principal.  Prepayments  of the  principal of  underlying  loans may shorten the
effective  maturities of these securities and may result in the Portfolio having
to reinvest proceeds at a lower interest rate.

Repurchase Agreements
The  Portfolio  may seek  additional  income  by  entering  into  collateralized
repurchase  agreements  with  respect  to  obligations  that it could  otherwise
purchase.   Repurchase  agreements  are  transactions  in  which  the  Portfolio
purchases  securities and  simultaneously  commits to resell those securities to
the seller at an  agreed-upon  price on an  agreed-upon  future date. The resale
price  reflects a market rate of interest that is not related to the coupon rate
or maturity of the purchased securities.

Reverse Repurchase Agreements
The Portfolio may enter into reverse repurchase  agreements.  Reverse repurchase
agreements  are  transactions  in  which  the  Portfolio  sells a  security  and
simultaneously  commits to repurchase  that security from the buyer at an agreed
upon price on an agreed upon future date.  This technique will be used primarily
for temporary or emergency purposes, such as meeting redemption requests.

Delayed Delivery Securities
The Portfolio  may purchase  securities  on a  when-issued  or delayed  delivery
basis.  Securities so purchased are subject to market price fluctuation from the
time of  purchase  but no interest on the  securities  accrues to the  Portfolio
until delivery and payment for the securities take place. Accordingly, the value
of the  securities  on the  delivery  date may be more or less than the purchase
price.  Forward commitments will be entered into only when the Portfolio has the
intention of taking possession of the securities, but it may sell the securities
before the settlement date if deemed advisable.

Borrowing and Lending
The Portfolio may borrow money for temporary or emergency purposes in amounts up
to 25% of its total assets.  It may not mortgage or pledge  securities except to
secure permitted  borrowings.  As a fundamental  policy,  the Portfolio will not
lend  securities  or other  assets  if, as a result,  more than 25% of its total
assets would be lent to other parties;  however, it does not currently intend to
engage in securities lending.  The Portfolio intends to seek permission from the
SEC to  borrow  money  from or lend  money  to  other  funds  that  permit  such
transactions  and are advised by Janus Capital.  There is no assurance that such
permission will be granted.

JANUS ASPEN SERIES MONEY MARKET PORTFOLIO PROSPECTUS          MAY 1, 1997      6

<PAGE>

Management of the Portfolio

TRUSTEES

The Trustees  oversee the business  affairs of the Trust and are responsible for
major decisions relating to the Portfolio's  investment  objective and policies.
The Trustees delegate the day-to-day management of the Portfolio to the officers
of the Trust and meet at least  quarterly to review the  Portfolio's  investment
policies, performance, expenses and other business affairs.

INVESTMENT ADVISER

Janus  Capital,  100  Fillmore  Street,  Denver,  Colorado  80206-4928,  is  the
investment  adviser  to the  Portfolio  and is  responsible  for the  day-to-day
management  of the  investment  portfolio  and  other  business  affairs  of the
Portfolio.

Janus Capital has served as investment adviser to Janus Fund since its inception
in 1970 and currently  serves as  investment  adviser to all of the Janus retail
funds,  as well as adviser or subadviser  to other mutual funds and  individual,
corporate, charitable and retirement accounts.

Kansas City Southern  Industries,  Inc.  ("KCSI") owns  approximately 83% of the
outstanding  voting stock of Janus  Capital,  most of which it acquired in 1984.
KCSI is a publicly traded holding company whose primary subsidiaries are engaged
in  transportation,  information  processing and financial  services.  Thomas H.
Bailey, President and Chairman of the Board of Janus Capital, owns approximately
12% of its voting stock and, by agreement with KCSI, selects a majority of Janus
Capital's Board.

Janus Capital  furnishes  continuous advice and  recommendations  concerning the
Portfolio's  investments.  Janus Capital also furnishes certain  administrative,
compliance and accounting  services for the Portfolio,  and may be reimbursed by
the  Portfolio for its costs in providing  those  services.  In addition,  Janus
Capital  employees  serve as  officers of the Trust and Janus  Capital  provides
office space for the Portfolio  and pays the salaries,  fees and expenses of all
Portfolio officers and those Trustees who are affiliated with Janus Capital.

Participating  insurance  companies  that  purchase the  Portfolio's  Shares may
perform  certain  administrative  services  relating to the  Portfolio and Janus
Capital or the Portfolio may pay those companies for such services.

INVESTMENT PERSONNEL

PORTFOLIO MANAGER

Sharon S. Pichler is  Executive  Vice  President  and  portfolio  manager of the
Portfolio,  which she has managed  since  inception.  She also has managed Janus
Money Market Fund, Janus Government Money Market Fund and Janus Tax-Exempt Money
Market Fund since  their  inception.  She holds a Bachelor of Arts in  Economics
from Michigan State University and a Master of Business  Administration from the
University  of  Texas at San  Antonio.  Ms.  Pichler  is a  Chartered  Financial
Analyst.

Personal Investing
Janus Capital does not permit portfolio managers to purchase and sell securities
for their own accounts,  except under the limited exceptions  contained in Janus
Capital's policy governing personal  investing.  Janus Capital's policy requires
investment and other personnel to conduct their personal  investment  activities
in a manner that Janus Capital  believes is not  detrimental to the Portfolio or
Janus  Capital's  other  advisory  clients.   See  the  SAI  for  more  detailed
information.

JANUS ASPEN SERIES MONEY MARKET PORTFOLIO PROSPECTUS          MAY 1, 1997      7

<PAGE>

BREAKDOWN OF MANAGEMENT EXPENSES AND EXPENSE LIMITS

The Portfolio pays Janus Capital a management fee which is calculated daily. The
advisory  agreement  with the Portfolio  spells out the management fee and other
expenses that the Portfolio  must pay. The Portfolio is subject to the following
management fee schedule (expressed as an annual rate):

Average Daily Net                Annual Rate                  Expense Limit
Assets of Portfolio              Percentage (%)               Percentage (%)
- --------------------------------------------------------------------------------
All Asset Levels                 .25                          .50
- --------------------------------------------------------------------------------
*    Janus  Capital  will  voluntarily  waive its advisory fee to the extent the
     advisory fees and other expenses  exceed 0.50% of the average daily closing
     net asset value of the  Portfolio.  Janus  Capital may modify or  terminate
     this fee waiver at any time upon at least 90 days' notice to the Trustees.

The  Shares of the  Portfolio  incur  expenses  not  assumed  by Janus  Capital,
including  transfer  agent and custodian  fees and expenses,  legal and auditing
fees,  printing and mailing costs of sending  reports and other  information  to
existing shareholders, and independent Trustees' fees and expenses.

PORTFOLIO TRANSACTIONS

Purchases  and sales of  securities  on behalf of the  Portfolio are executed by
broker-dealers  selected by Janus  Capital.  Broker-dealers  are selected on the
basis of their ability to obtain best price and  execution  for the  Portfolio's
transactions and recognizing brokerage,  research and other services provided to
the Portfolio and to Janus  Capital.  Janus Capital may consider sales of shares
of the Portfolios or other Janus funds by a broker-dealer or the  recommendation
of a broker-dealer to its customers that they purchase a Portfolio's shares as a
factor in the selection of  broker-dealers  to execute  Portfolio  transactions.
Janus Capital may also consider payments made by brokers effecting  transactions
for the  Portfolio i) to the  Portfolio or ii) to other persons on behalf of the
Portfolio for services provided to the Portfolio for which it would be obligated
to  pay.  The  Trustees  have  authorized   Janus  Capital  to  place  portfolio
transactions  on an agency  basis  with a  broker-dealer  affiliated  with Janus
Capital.   When   transactions   for  the   Portfolio  are  effected  with  that
broker-dealer,  the  commissions  payable by the Portfolio are credited  against
certain Portfolio  operating expenses serving to reduce those expenses.  The SAI
further explains the selection of broker-dealers.

OTHER SERVICE PROVIDERS

The  following  parties  provide the  Portfolio  with  administrative  and other
services.

Custodian
United Missouri Bank, N.A.
P.O. Box 419226
Kansas City, Missouri 64141-6226

Transfer Agent
Janus Service Corporation
P.O. Box 173375
Denver, Colorado 80217-3375

Janus Service Corporation is a wholly-owned subsidiary of Janus Capital.

OTHER INFORMATION

Organization
The Trust is a "mutual fund" that was organized as a Delaware  business trust on
May 20,  1993.  A mutual  fund is an  investment  vehicle  that pools money from
numerous investors and invests the money to achieve a specified  objective.  The
Trust offers Shares in eleven separate  series,  one of which is offered by this
Prospectus.

The  Portfolio  currently  offers  two  classes  of  Shares,  one of which,  the
Institutional Shares, are offered pursuant to this prospectus and are sold under
the name Janus Aspen Series. The Shares offered by this Prospectus are available
only in connection with investment in and payments under variable  contracts and
life  insurance  contracts  as  well  as  certain  qualified  retirement  plans.
Retirement  Shares of the Portfolio are offered by separate  prospectus  and are
available  only to  participant  directed  qualified  plans  using plan  service
providers that are compensated for providing  distribution and/or  recordkeeping
and other  administrative  services provided to plan  participants.  Because the
expenses of each class may differ,  the performance of each class is expected to
differ. If you would like additional  information  about the Retirement  Shares,
please call 1-800-525-0020.

JANUS ASPEN SERIES MONEY MARKET PORTFOLIO PROSPECTUS          MAY 1, 1997      8

<PAGE>

Shareholder Meetings and Voting Rights
The Trust does not intend to hold annual shareholder meetings.  However, special
meetings  may be called for the class or  Portfolio  or for the Trust as a whole
for purposes such as electing or removing Trustees,  terminating or reorganizing
the Trust,  changing fundamental  policies, or for any other purpose requiring a
shareholder  vote under the 1940 Act.  Separate  votes are taken by the class or
Portfolio  only if a matter  affects or  requires  the vote of only the class or
Portfolio or the interest of a class or Portfolio in the matter differs from the
interest of the other class or Portfolios of the Trust.  As a  shareholder,  you
are entitled to one vote for each share that you own.

An  insurance  company  issuing a variable  contract  invested  in Shares of the
Portfolio will request voting instructions from variable contract holders. Under
current  law,  the  insurance  company must vote all Shares held by the separate
account in proportion to the voting instructions received.

Conflicts of Interest
The Portfolio's  Shares are available only to variable annuity and variable life
separate  accounts  of  insurance  companies  that are  unaffiliated  with Janus
Capital and to certain  qualified  retirement  plans.  Retirement  Shares of the
Portfolio  (offered  through a separate  prospectus)  are  available  to certain
participant directed qualified plans.  Although the Portfolio currently does not
anticipate  any  disadvantages  to policy owners arising out of the fact that it
offers  its  shares to such  entities,  there is a  possibility  that a material
conflict  may  arise.  The  Trustees  monitor  events in order to  identify  any
anticipated  disadvantages or material  irreconcilable  conflicts that may arise
and to determine what action, if any, should be taken in response. If a material
disadvantage or conflict occurs,  the Trustees may require one or more insurance
company  separate  accounts or plans to withdraw its investment in the Portfolio
or  substitute  shares of another  portfolio of the Trust.  If this occurs,  the
Portfolio  may be  forced  to sell  securities  at  disadvantageous  prices.  In
addition,  the  Trustees  may  refuse  to sell  shares of the  Portfolio  to any
separate  account or may suspend or terminate  the  offering of the  Portfolio's
shares if such action is required by law or  regulatory  authority  or is in the
best interests of the Portfolio's shareholders.  It is possible that a qualified
plan  investing  in the  Retirement  Shares  of the  Portfolio  could  lose  its
qualified plan status under the Internal  Revenue Code, which could have adverse
tax consequences on insurance company separate accounts investing in the Shares.
Janus  Capital  intends to monitor such  qualified  plans and the  Portfolio may
discontinue  sales  to a  qualified  plan and  require  plan  participants  with
existing  investments in the Retirement  Shares to redeem those investments if a
plan  loses  (or in the  opinion  of Janus  Capital  is at risk of  losing)  its
qualified plan status.

Master/Feeder Option
The Trust may in the future seek to achieve the Portfolio's investment objective
by investing all of the Portfolio's  assets in another investment company having
the same investment objective and substantially the same investment policies and
restrictions as those applicable to the Portfolio.  It is expected that any such
investment  company would be managed by Janus Capital in substantially  the same
manner as the existing  Portfolio.  The initial  shareholder(s) of the Portfolio
voted to vest the authority to convert to a master/feeder  structure in the sole
discretion  of the  Trustees.  No further  approval of the  shareholders  of the
Portfolio  is  required.  You will receive at least 30 days' prior notice of any
such investment. Such investment would be made only if the Trustees determine it
to be in the best  interests of the  Portfolio and its  shareholders.  In making
that determination, the Trustees will consider, among other things, the benefits
to shareholders  and/or the opportunity to reduce costs and achieve  operational
efficiencies.  Although  management of the Portfolio  believes the Trustees will
not  approve  an  arrangement  that is likely to  result  in  higher  costs,  no
assurance  is given  that  costs will be  materially  reduced if this  option is
implemented.

The Valuation of Shares
The NAV of the Shares of the Portfolio is determined at the close of the regular
trading session of the New York Stock Exchange (the "NYSE") (normally 4:00 p.m.,
New York time) each day that the NYSE is open.  NAV per Share is  determined  by
dividing the total value of the securities and other assets,  less  liabilities,
by the total number of Shares outstanding.

Portfolio  securities  are  valued  at  their  amortized  cost.  Amortized  cost
valuation  involves valuing an instrument at its cost and thereafter  assuming a
constant amortization to maturity (or such other date as permitted by Rule 2a-7)
of any discount or premium. If fluctuating interest rates cause the market value
of the portfolio to deviate more than 1/2 of 1% from the value determined on the
basis of amortized cost, the Trustees will consider whether any action,  such as
adjusting  the  Share's  NAV to reflect  current  market  conditions,  should be
initiated to prevent any material dilutive effect on shareholders.

JANUS ASPEN SERIES MONEY MARKET PORTFOLIO PROSPECTUS          MAY 1, 1997      9

<PAGE>

Distributions and Taxes
- --------------------------------------------------------------------------------
DISTRIBUTIONS
To avoid  taxation of the  Portfolio,  the Internal  Revenue  Code  requires the
Portfolio to distribute net income and any net gains realized by its investments
annually.  Income from  dividends  and interest and any net realized  short-term
capital  gains  are paid to  shareholders  as  ordinary  income  dividends.  Net
realized  long-term  gains,  if any, are paid to  shareholders  as capital gains
distributions.

Dividends  representing  substantially  all of the net investment income and any
net realized gains on sales of securities are declared daily, Saturdays, Sundays
and holidays  included,  and distributed on the last business day of each month.
If a month begins on a Saturday, Sunday or holiday, dividends for those days are
declared at the end of the preceding month and distributed on the first business
day of the month. All distributions  will be automatically  reinvested in Shares
of the Portfolio. 
- --------------------------------------------------------------------------------
TAXES
Because Shares of the Portfolio may be purchased only through variable insurance
contracts and qualified  plans, it is anticipated  that any income  dividends or
capital gains  distributions  made by the Shares of the Portfolio will be exempt
from  current  taxation  if left to  accumulate  within the  variable  insurance
contract or qualified plan.  Generally,  withdrawals  from such contracts may be
subject to  ordinary  income tax and,  if made  before age 59 1/2, a 10% penalty
tax. The tax status of your  investment in the Shares depends on the features of
the  variable  insurance  contracts  purchased  from a  participating  insurance
company.  Further  information  may be found in the  prospectus  of the separate
account offering such contract.

The Portfolio  does not expect to pay any federal income or excise taxes because
it intends  to meet  certain  requirements  of the  Internal  Revenue  Code.  In
addition,  the Portfolio intends to qualify under the Internal Revenue Code with
respect to the diversification  requirements  related to the tax-deferred status
of insurance company separate accounts.

JANUS ASPEN SERIES MONEY MARKET PORTFOLIO PROSPECTUS          MAY 1, 1997     10

<PAGE>

Shareholder's Guide

INVESTORS MAY NOT PURCHASE OR REDEEM SHARES OF THE  PORTFOLIO  DIRECTLY.  SHARES
MAY BE PURCHASED OR REDEEMED ONLY THROUGH VARIABLE  INSURANCE  CONTRACTS OFFERED
BY THE  SEPARATE  ACCOUNTS  OF  PARTICIPATING  INSURANCE  COMPANIES  OR  THROUGH
QUALIFIED  RETIREMENT  PLANS.  REFER  TO THE  PROSPECTUS  FOR THE  PARTICIPATING
INSURANCE  COMPANY'S SEPARATE ACCOUNT OR YOUR PLAN DOCUMENTS FOR INSTRUCTIONS ON
PURCHASING OR SELLING OF VARIABLE  INSURANCE  CONTRACTS AND ON HOW TO SELECT THE
PORTFOLIO AS AN INVESTMENT OPTION FOR A CONTRACT OR A QUALIFIED PLAN.

PURCHASES

Purchases  of Shares  may be made only by the  separate  accounts  of  insurance
companies  for  the  purpose  of  funding  variable  insurance  contracts  or by
qualified plans. Refer to the prospectus of the appropriate  insurance company's
separate  account or your plan documents for information on how to invest in the
Shares of the Portfolio.

All  investments  in the  Portfolio  are credited to a  participating  insurance
company's  separate  account or a qualified plan  immediately upon acceptance of
the investment by the Portfolio.  Investments  will be processed at the NAV next
determined after an order is received and accepted by the Portfolio.

The Portfolio reserves the right to reject any specific purchase order. Purchase
orders may be refused if, in Janus  Capital's  opinion,  they are of a size that
would disrupt the  management of the  Portfolio.  The Portfolio may  discontinue
sales of its shares if management  believes that a substantial  further increase
may  adversely  affect  the  Portfolio's   ability  to  achieve  its  investment
objective. In such event, however, it is anticipated that existing policy owners
and plan  participants  invested in the Portfolio would be permitted to continue
to  authorize  investment  in the  Portfolio  and to reinvest  any  dividends or
capital gains distributions.

REDEMPTIONS

Redemptions,  like purchases, may be effected only through the separate accounts
of participating insurance companies or through qualified plans. Please refer to
the appropriate separate account prospectus or plan documents for details.

Shares of the  Portfolio may be redeemed on any business  day.  Redemptions  are
processed  at the NAV  next  calculated  after  receipt  and  acceptance  of the
redemption order by the Portfolio. Redemption proceeds will normally be wired to
the  participating  insurance  company the business day following receipt of the
redemption  order,  but in no event later than seven days after  receipt of such
order.

SHAREHOLDER COMMUNICATIONS

Shareholders will receive annual and semiannual  reports including the financial
statements of the Shares of the Portfolio. Each report will show the investments
owned  by the  Portfolio  and the  market  values  thereof,  as  well  as  other
information about the Portfolio and its operations. The Trust's fiscal year ends
December 31.

JANUS ASPEN SERIES MONEY MARKET PORTFOLIO PROSPECTUS          MAY 1, 1997     11

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                   100 Fillmore Street
                   Denver, Colorado 80206-4928
                   (800) 525-0020

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