JANUS INVESTMENT FUND
497, 1995-07-26
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CONTENTS

Fee Table .................................................................    1
Financial Highlights ......................................................    2
Investment Objectives, Policies and Techniques ............................    3
Investment Adviser and Administrator ......................................    6
Distributions and Taxes ...................................................    7
Performance ...............................................................    8
Miscellaneous Information .................................................    8
Shareholder's Manual
How to Open an Account ....................................................    9
How to Buy Shares .........................................................   10
How to Exchange Shares ....................................................   11
How to Redeem Shares ......................................................   11
Special Shareholder Services and Other Information ........................   13


                                     [LOGO]

                            JANUS MONEY MARKET FUND
                       JANUS GOVERNMENT MONEY MARKET FUND
                       JANUS TAX-EXEMPT MONEY MARKET FUND
                                Investor Shares
                         100 Fillmore Street, Suite 300
                             Denver, CO 80206-4923
                                 1-800-525-3713
                February 15, 1995 as supplemented July 24, 1995

Janus Money Market Fund, Janus Government Money Market Fund and Janus Tax-Exempt
Money  Market Fund  (individually  a "Fund" and  collectively  the  "Funds") are
designed for investors who seek maximum current income consistent with stability
of  capital.  This  prospectus  offers a  separate  class of shares of each Fund
(collectively,  the  "Shares")  to the general  public.  Each Fund is a separate
series of Janus Investment Fund (the "Trust"), an open-end management investment
company. Each Fund invests exclusively in high quality money market instruments.
The Funds  are  recently  organized  and have a limited  operating  history.  AN
INVESTMENT IN A FUND IS NEITHER  INSURED NOR GUARANTEED BY THE U.S.  GOVERNMENT.
THERE IS NO  ASSURANCE  THAT A FUND WILL BE ABLE TO  MAINTAIN A STABLE NET ASSET
VALUE OF $1.00 PER SHARE. 

The Funds are no-load funds.  They sell and redeem the Shares at net asset value
without any sales  charges,  commissions or redemption  fees.  There are no Rule
12b-1 plans or deferred sales charges. There is no minimum initial investment if
shareholders  choose the automatic monthly investing option described at page 9.
Otherwise,  the minimum initial  investment is $1,000 ($250 for IRAs, most other
retirement plans and Uniform Gifts/Transfers to Minors accounts) and the minimum
subsequent  investment  is $50. An exchange  program  among other Janus funds is
also  available.  For complete  details on how to purchase,  redeem and exchange
Shares, please see the Shareholder's Manual beginning at page 9. 

This Prospectus contains information about the Shares that prospective investors
should consider  before  investing and should be read carefully and retained for
future  reference.  Additional  information about the Shares is contained in the
Statement  of  Additional  Information  ("SAI")  dated  February  15,  1995,  as
supplemented  July 24,  1995,  which is filed with the  Securities  and Exchange
Commission  ("SEC") and is incorporated by reference into this  Prospectus.  The
SAI is available upon request and without charge by writing or calling the Funds
at the address or telephone  number shown above.  

THESE  SECURITIES  HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SEC OR ANY STATE
SECURITIES  COMMISSION NOR HAS THE SEC OR ANY STATE SECURITIES COMMISSION PASSED
UPON 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>

FEE TABLE

SHAREHOLDER TRANSACTION EXPENSES (Applicable to each Fund) 

Sales Load Imposed on Purchases               None 
Sales Load Imposed on Reinvested Dividends    None 
Deferred Sales Load                           None  
Redemption Fees*                              None  
Exchange Fee                                  None 

* An $8 service fee may be charged for redemptions by wire.

<TABLE>
<CAPTION>
ANNUAL OPERATING EXPENSES*
(Expressed as a percentage of average net assets)
                                                          Management Fee     Other Expenses        Total Operating Expenses
<S>                                                            <C>                <C>                     <C> 
Janus Money Market Fund-Investor Shares                        .10%               .50%                    .60%
Janus Government Money Market Fund-Investor Shares             .10%               .50%                    .60%
Janus Tax-Exempt Money Market Fund-Investor Shares             .10%               .50%                    .60%
</TABLE>

EXAMPLE*

You would indirectly pay the following expenses on a $1,000 investment, assuming
a 5% annual return, with or without redemption at the end of each period:

                                                        1 Year        3 Years
Janus Money Market Fund-Investor Shares                   $6            $19
Janus Government Money Market Fund-Investor Shares        $6            $19
Janus Tax-Exempt Money Market Fund-Investor Shares        $6            $19
                                                             
*The fees and expenses in the table and example above are based on the estimated
fees and expenses that the Shares expect to incur in their initial  fiscal year,
net of fee waivers  from the  investment  adviser.  Without  such  waivers,  the
Management Fee, Other Expenses and Total Operating  Expenses are estimated to be
 .20%, .50% and .70%,  respectively.  See "Investment  Adviser and Administrator"
for a more detailed discussion of the fees.

THE EXPENSES IN THE EXAMPLE ABOVE SHOULD NOT BE CONSIDERED A  REPRESENTATION  OF
PAST OR FUTURE  EXPENSES  AND ACTUAL  EXPENSES MAY BE GREATER OR LESS THAN THOSE
SHOWN. THE ASSUMED 5% ANNUAL RETURN IS HYPOTHETICAL AND SHOULD NOT BE CONSIDERED
A REPRESENTATION OF PAST OR FUTURE ANNUAL RETURNS,  WHICH MAY BE GREATER OR LESS
THAN THE ASSUMED AMOUNT.

The  purpose of the  preceding  table and  example is to assist the  investor in
understanding  the various costs and expenses that an investor in each Fund will
bear directly or  indirectly.  These  expenses are  described in greater  detail
under "Investment Adviser and Administrator."


JANUS MONEY MARKET FUNDS-INVESTOR SHARES PROSPECTUS            FEBRUARY 15, 1995
                                                   AS SUPPLEMENTED JULY 24, 1995

                                       1
<PAGE>

FINANCIAL HIGHLIGHTS

The unaudited  information  below is for the  semiannual  period ended April 30,
1995.  Expense and income ratios have been  annualized  while total returns have
not been annualized.

<TABLE>
<CAPTION>
                                                             Janus                         Janus                         Janus
                                                          Money Market           Government Money Market     Tax-Exempt Money Market
    Investor Shares                                          Fund(1)                       Fund(1)                       Fund(1)
    ---------------                                       ------------           -----------------------     -----------------------
<S>                                                           <C>                           <C>                               <C>  
 1. Net asset value, beginning of period                     $1.00                         $1.00                           $  1.00
    Income from investment operations:                                                                          
 2. Net investment income                                      .01                           .01                           --*
 3. Net gains or (losses) on securities
    (both realized and unrealized)                              --                            --                           --
 4. Total from investment operations                           .01                           .01                           --
    Less distributions:
 5. Dividends (from net investment income)                    (.01)                         (.01)                          --*
 6. Distributions (from capital gains)                          --                            --                           --
 7. Total distributions                                       (.01)                         (.01)                          --
 8. Net asset value, end of period                           $1.00                         $1.00                           $  1.00
 9. Total return                                              1.13%                         1.12%                              .70%
10. Net assets, end of period (in thousands)                $398,345                       $78,537                         $52,088
11. Ratio of expenses to average net assets                    .60%(2)                       .60%(2)                        .60%(2)
12. Ratio of net investment income
    to average net assets                                     5.55%                         5.45%                             3.54%
</TABLE>

*Amounts are less than $.01 per share.
(1)Period from February 15, 1995 (inception) through April 30, 1995.
(2)The  ratio of  expenses  to  average  net assets  was .70%  before  voluntary
reduction of fees.


JANUS MONEY MARKET FUNDS-INVESTOR SHARES PROSPECTUS            FEBRUARY 15, 1995
                                                   AS SUPPLEMENTED JULY 24, 1995

                                       2
<PAGE>

INVESTMENT OBJECTIVES, POLICIES AND TECHNIQUES

Unless  otherwise  stated,  the investment  objectives and policies set forth in
this  Prospectus are not  fundamental  and may be changed by the Trustees of the
Trust  (the  "Trustees")  without  shareholder  approval.  Shareholders  will be
notified of material changes in investment objectives or policies. If there is a
change in the investment objective or policies of any Fund,  shareholders should
consider  whether that Fund remains an appropriate  investment in light of their
then current  financial  position and needs. The Funds are subject to additional
investment  policies and  restrictions  described in the Statement of Additional
Information,  some of  which  are  fundamental  and may not be  changed  without
shareholder approval.  

INVESTMENT OBJECTIVES  

The investment objective of each of Janus Money Market Fund and Janus Government
Money Market Fund is to seek  maximum  current  income to the extent  consistent
with stability of capital.  The investment  objective of Janus  Tax-Exempt Money
Market Fund is to seek maximum current income that is exempt from federal income
taxes to the  extent  consistent  with  stability  of  capital.  There can be no
assurance that a Fund will achieve its  investment  objective or that the Shares
will be able to  maintain  a stable net asset  value of $1.00 per share.  

COMMON INVESTMENT POLICIES  

The Funds will invest only in eligible  high  quality,  short-term  money market
instruments  that present  minimal credit risks,  as determined by Janus Capital
Corporation,  the Funds'  investment  adviser  ("Janus  Capital"),  pursuant  to
procedures  adopted  by  the  Trustees.  Each  Fund  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), each Fund 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 a Fund that are issued or guaranteed by that  institution
does not exceed 10% of the Fund's total assets.  In the case of Janus Tax-Exempt
Money Market Fund, up to 25% of its assets may be invested without regard to the
foregoing  limitations.  To ensure adequate  liquidity,  no Fund may invest more
than  10% of  its  net  assets  in  illiquid  securities,  including  repurchase
agreements  maturing in more than seven days and certain time  deposits that are
subject  to early  withdrawal  penalties  and  mature in more than  seven  days.
Because the Funds are typically used as a cash management  vehicle,  they intend
to maintain a high degree of liquidity.  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.  Each Fund,
except Janus Tax-Exempt Money Market Fund, 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 Ratings
Services,  Moody's  Investors  Service,  Inc.,  and  certain  other  NRSROs  are
contained  in the  SAI as is a  further  description  of the  Funds'  investment
policies.

Although  each Fund only invests in high quality  money market  instruments,  an
investment  in a Fund is  subject  to risk  even if all  securities  in a Fund's
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 SECURITIES

JANUS MONEY MARKET FUND

Janus Money  Market Fund pursues its  objective  by investing  primarily in high
quality commercial paper and obligations of financial institutions. The Fund may
also  invest in U.S.  Government  Securities  (as defined  below) and  municipal
securities,  although the Fund expects to invest in such  securities to a lesser
degree.  

Debt Securities.

The  Fund  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 Fund may invest in privately  issued  commercial
paper which is restricted as to disposition  under the federal  securities laws.
In general, any sale of this paper may not be made absent registration under the
Securities  Act of 1933 (the "1933 Act") or the  availability  of an appropriate
exemption therefrom. Pursuant to the provisions of Section 4(2) of the 1933 Act,
however,  some  privately  issued  commercial  paper is  eligible  for resale to
institutional  investors,  and  accordingly,  Janus Capital may determine that a
liquid  market  exists  for that paper  pursuant  to  guidelines  adopted by the
Trustees.  

Obligations of Financial Institutions.

The Fund may  invest in  obligations  of  financial  institutions.  Examples  of
obligations  in which the Fund 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 Fund may also invest in Eurodollar and Yankee bank  obligations as
discussed below.  


JANUS MONEY MARKET FUNDS-INVESTOR SHARES PROSPECTUS            FEBRUARY 15, 1995
                                                   AS SUPPLEMENTED JULY 24, 1995

                                       3
<PAGE>

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 a  stated  maturity  date and  bear a fixed  rate of  interest,
generally  may be  withdrawn  on demand by the Fund but may be  subject to early
withdrawal  penalties  that could  reduce the Fund'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 Fund 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 Fund may invest  without  limit in U.S.  Government  Securities as described
below under "Janus Government Money Market Fund." 

Municipal Securities. 

The Fund may invest in obligations of states,  territories or possessions of the
United States and their subdivisions,  authorities and corporations as described
below under "Janus  Tax-Exempt  Money Market  Fund." These  obligations  may pay
interest that is exempt from federal income taxation.

JANUS GOVERNMENT MONEY MARKET FUND

Janus   Government   Money  Market  Fund  pursues  its  objective  by  investing
exclusively in obligations issued and/or guaranteed as to principal and interest
by the United  States  government or by its agencies and  instrumentalities  and
repurchase agreements secured by such obligations.  

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  and has
been interpreted to include repurchase  agreements  collateralized and municipal
securities refunded with escrowed U.S. government  securities ("U.S.  Government
Securities").  U.S.  Government  Securities in which the Fund 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 Fund 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.

JANUS TAX-EXEMPT MONEY MARKET FUND

Janus Tax-Exempt Money Market Fund pursues its objective by investing  primarily
in municipal  securities  whose  interest is exempt from federal  income  taxes,
including the federal alternative minimum tax. Although the Fund will attempt to
invest substantially all of its assets in municipal securities whose interest is
exempt from federal  income  taxes,  the Fund reserves the right to invest up to
20% of the value of its net assets in  securities  whose  interest is  federally
taxable. Additionally, when its portfolio manager is unable to locate investment
opportunities with desirable  risk/reward  characteristics,  the Fund may invest
without limit in cash and cash  equivalents,  including  obligations that may be
federally taxable (See "Taxable Investments").

Municipal Securities.

The municipal  securities in which the Fund 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. Examples include tax anticipation and revenue  anticipation notes,
which generally are issued in anticipation of various  seasonal  revenues,  bond
anticipation  notes,  construction  loan notes and tax-exempt  commercial paper.
Short-term  municipal bonds may include  "general  obligation  bonds," which are
secured by the issuer's pledge of its faith, credit and taxing power for payment
of principal and interest;  "revenue  bonds," which are generally  paid from the
revenues of a particular  facility or a specific excise tax or other source; and
"industrial  development  bonds,"  which  are  issued  by or on behalf of public
authorities to provide  funding for various  privately  operated  industrial and
commercial  facilities.  The Fund 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.

When the assets and revenues of an agency,  authority,  instrumentality or other
political  subdivision  are separate from those of the  


JANUS MONEY MARKET FUNDS-INVESTOR SHARES PROSPECTUS            FEBRUARY 15, 1995
                                                   AS SUPPLEMENTED JULY 24, 1995

                                       4
<PAGE>

government  creating  the  issuing  entity and a security  is backed only by the
assets and revenues of the issuing entity,  that entity will be deemed to be the
sole issuer of the security. Similarly, in the case of an industrial development
bond backed only by the assets and revenues of the non-governmental  issuer, the
non-governmental issuer will be deemed to be the sole issuer of the bond.

At times,  the Fund may invest more than 25% of the value of its total assets in
tax-exempt securities that are related in such a way that an economic, business,
or political  development or change  affecting one such security could similarly
affect the other securities;  for example,  securities whose issuers are located
in the same state,  or  securities  whose  interest is derived from  revenues of
similar type  projects.  The Fund may also invest more than 25% of its assets in
industrial development bonds or participation interests therein.

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. The achievement of the Fund's investment
objective  is  dependent  in part on the  continuing  ability of the  issuers of
municipal securities in which the Fund invests to meet their obligations for the
payment of principal and interest when due.  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.  

Municipal Leases.

The Fund may invest in  municipal  leases or  participation  interests  therein.
Municipal leases are municipal  securities which may take the form of a lease or
an installment  purchase or conditional  sales  contract.  Municipal  leases are
issued by state and local  governments and authorities to acquire a wide variety
of equipment and facilities.  

Lease obligations may not be backed by the issuing municipality's credit and may
involve risks not normally  associated with general  obligation  bonds and other
revenue  bonds.  For example,  their interest may become taxable if the lease is
assigned  and the  holders may incur  losses if the issuer does not  appropriate
funds for the lease payment on an annual basis,  which may result in termination
of the lease and possible  default.  Janus Capital may  determine  that a liquid
market exists for municipal lease obligations pursuant to guidelines established
by the Trustees. 

Taxable Investments. 

As discussed above,  although the Fund will attempt to invest  substantially all
of its assets in  municipal  securities  whose  interest is exempt from  federal
income  tax,  the  Fund  may  under  certain  circumstances  invest  in  certain
securities whose interest is subject to such taxation. These securities include:
(i)   short-term   obligations   of  the  U.S.   government,   its  agencies  or
instrumentalities,  (ii)  certificates  of  deposit,  bankers'  acceptances  and
interest-bearing  savings deposits of banks having total assets of more than one
billion dollars and whose deposits are insured by the Federal Deposit  Insurance
Corporation,  (iii) commercial paper and (iv) repurchase agreements as described
below covering any of the securities  described in items  (i)-(iii) above or any
other  obligations of the U.S.  government,  its agencies or  instrumentalities.

COMMON INVESTMENT TECHNIQUES 

Participation Interests.

The Funds may invest in participation interests in any type of security in which
the  Funds  may  invest.  A  participation  interest  gives a Fund an  undivided
interest  in  the  underlying  securities  in the  proportion  that  the  Fund'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 Funds  may  invest  in  securities  that are  subject  to puts and  stand-by
commitments  ("demand  features").  Demand  features  give the Fund 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 Funds'  investments may be dependent in part
on the credit quality of the banks supporting the Funds' 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 Funds invest 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 


JANUS MONEY MARKET FUNDS-INVESTOR SHARES PROSPECTUS            FEBRUARY 15, 1995
                                                   AS SUPPLEMENTED JULY 24, 1995

                                       5
<PAGE>

by a Fund may be tied to short-term  Treasury or other government  securities or
indices on securities that are permissible  investments of the Funds, as well as
other money  market rates of  interest.  The Funds will not purchase  securities
whose values are tied to interest rates or indexes that are not  appropriate for
the duration and  volatility  standards  of a money market fund.  

Mortgage- and Asset-Backed Securities.

Janus Money  Market Fund and Janus  Government  Money  Market Fund 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. In addition, Janus Money Market Fund 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 a Fund  having to
reinvest proceeds at a lower interest rate. 

Repurchase Agreements. 

Each Fund may seek additional income by entering into repurchase agreements with
respect to obligations  that could otherwise be purchased by a Fund.  Repurchase
agreements  are   transactions   in  which  a  Fund  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.  If  the  seller  of  the  securities  underlying  a
repurchase agreement fails to pay the agreed resale price on the agreed delivery
date, a Fund may incur costs in disposing of the  collateral  and may experience
losses  if  there is any  delay  in its  ability  to do so.  

Reverse Repurchase Agreements.  

Each Fund may enter  into  reverse  repurchase  agreements.  Reverse  repurchase
agreements are transactions in which a Fund 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 only for  temporary  or
emergency  purposes,  such as meeting redemption  requests or to earn additional
income on  portfolio  securities.  

Delayed Delivery Securities.

Each Fund 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 a Fund 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 a Fund has the  intention of taking
possession  of the  securities,  but a Fund may sell the  securities  before the
settlement date if deemed advisable. 

Borrowing and Lending.

Each Fund may borrow money for temporary or emergency  purposes in amounts up to
25% of its total assets. A Fund may not mortgage or pledge  securities except to
secure  permitted  borrowings.  As a  fundamental  policy,  a Fund 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,  the Funds do not currently  intend to
engage in securities lending.  Each Fund 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. 

Portfolio Turnover. 

Because the Funds invest in securities  with relatively  short-term  maturities,
each Fund is expected to have a high portfolio  turnover rate.  However,  a high
turnover rate should not increase a Fund's costs because  brokerage  commissions
are not normally  charged on the purchase and sale of money market  instruments.

Joint Accounts. 

The Funds have requested  exemptive  relief from the SEC to permit the Funds and
other  funds  advised  by Janus  Capital  to  invest  in  certain  money  market
instruments  through a joint account.  Accordingly,  the Funds may purchase such
instruments through a joint account if such relief is granted.

INVESTMENT ADVISER AND ADMINISTRATOR

INVESTMENT ADVISER

Each Fund has a  separate  Investment  Advisory  Agreement  with  Janus  Capital
Corporation,  100 Fillmore Street, Suite 300, Denver, Colorado 80206-4923. Janus
Capital has served as investment  adviser to Janus Fund since 1970 and currently
serves as  investment  adviser to all of the Janus funds,  as well as adviser or
subadviser  to other  mutual funds and  individual,  corporate,  charitable  and
retirement accounts.  Kansas City Southern  Industries,  Inc., a publicly traded
holding company whose primary  subsidiaries  are engaged in  transportation  and
financial  services  ("KCSI"),  owns approximately 83% of the outstanding voting
stock of Janus  Capital.  Thomas H. Bailey,  the  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. 

Pursuant  to  the  Investment  Advisory  Agreements,   Janus  Capital  furnishes
continuous advice and recommendations  concerning each Fund's investments.  Each
of the Funds has agreed to compensate Janus Capital for its advisory services by
the  monthly  payment of a fee at the  annual  rate of 0.20% of the value of the
average daily net assets of each Fund. Until at least the period ending June 16,
1996,  however,  Janus  Capital  has  agreed to waive a  portion  of its fee and
accordingly,  the advisory fee of each Fund will  initially be calculated at the
annual  rate of 0.10% of the value of each  Fund's  average  daily  net  assets.


JANUS MONEY MARKET FUNDS-INVESTOR SHARES PROSPECTUS            FEBRUARY 15, 1995
                                                   AS SUPPLEMENTED JULY 24, 1995

                                       6
<PAGE>

ADMINISTRATOR  

Each of the Funds has also entered into an  Administration  Agreement with Janus
Capital,  pursuant  to which Janus  Capital  furnishes  certain  administrative,
compliance  and  accounting  services for the Funds,  pays the costs of printing
reports and  prospectuses for existing  shareholders,  provides office space for
the Funds and pays the  salaries,  fees and expenses of all Fund officers and of
those Trustees who are affiliated  with Janus Capital.  Administrative  services
provided by Janus  Capital  under the  Agreements  include  custody and transfer
agency services. Janus Capital is paid a fee, calculated daily and paid monthly,
at the annual rate of 0.50% of the value of the average daily net assets of each
Fund attributable to Shares for services rendered pursuant to the Administration
Agreements.  

Each Fund pays all of its  expenses  not  assumed  by Janus  Capital,  including
auditing fees and independent  Trustees' fees and expenses.  For the fiscal year
ending October 31, 1995, Janus Capital has undertaken to reimburse the Funds for
audit fees and expenses  and the fees and expenses of Fund  Trustees who are not
affiliated  with Janus  Capital.  

PORTFOLIO TRANSACTIONS

Purchase and sales of  securities on behalf of each Fund are executed by brokers
and dealers selected by Janus Capital.  Broker-dealers are selected on the basis
of their ability to obtain best price and execution for the Funds'  transactions
and recognizing brokerage,  research and other services provided to the Fund and
to Janus  Capital.  Janus  Capital may also  consider  payments  made by brokers
effecting  transactions  for a Fund i) to the  Fund or ii) to other  persons  on
behalf  of the  Fund for  services  provided  to the Fund for  which it would be
obligated to pay. The Funds'  Trustees have also  authorized  the Funds to place
portfolio  transactions  on  an  agency  basis  with  a  broker-dealer  that  is
affiliated with Janus Capital.  Agency trades, if any, that are placed with such
affiliated party serve to reduce certain expenses of the Funds. The Statement of
Additional   Information  further  explains  the  selection  of  broker-dealers.

PERSONAL INVESTING

Janus Capital permits  investment  personnel to purchase and sell securities for
their  own  accounts  subject  to  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 Funds and Janus  Capital's  other  advisory
clients. See the SAI for more detailed information.

DISTRIBUTIONS AND TAXES

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.
Distributions  will be  reinvested  in  Shares  of a Fund or paid in cash at the
election of the shareholder.  If no election is made, all distributions  will be
reinvested in additional Shares of a Fund.

Shares  purchased by wire on a day on which the Funds  calculate their net asset
value will receive  that day's  dividend if the purchase is effected at or prior
to 3:00 p.m.  (New York time) for the Janus  Money  Market and Janus  Government
Money Market Funds and 12:00 p.m. (New York time) for the Janus Tax-Exempt Money
Market Fund.  Otherwise,  such Shares begin to accrue dividends on the following
business day.  Orders for purchase  accompanied  by a check or other  negotiable
bank draft will be accepted and effected as of 4:00 p.m.  (New York time) on the
day of  receipt  and such  Shares  will begin to accrue  dividends  on the first
business day following receipt of the order.

Redemption  orders  effected  on  any  particular  day  will  generally  receive
dividends declared through the day of redemption.  However,  redemptions made by
wire which are received  prior to 3:00 p.m.  (New York time) for the Janus Money
Market and Janus  Government  Money Market Funds and 12:00 p.m.  (New York time)
for the Janus  Tax-Exempt Money Market Fund will result in Shares being redeemed
that  day.  Proceeds  of  such  a  redemption  will  normally  be  sent  to  the
predesignated account on that day, and that day's dividend will not be received.
Requests for redemptions  made by wire which are received after 3:00 p.m. (12:00
p.m. for Janus  Tax-Exempt  Money Market Fund) will be processed on that day and
receive that day's dividend,  but will not be wired until the following business
day.  

Distributions  for all of the Funds (except Janus  Tax-Exempt Money Market Fund)
are  taxable   income  and  are  subject  to  federal  income  tax  (except  for
shareholders exempt from income tax), whether such distributions are received in
cash or are reinvested in additional Shares. Full information  regarding the tax
status of income dividends and any capital gains distributions will be mailed to
shareholders  for tax purposes on or before  January 31st of each year.  Because
the Funds are money  market  funds,  they do not  anticipate  making any capital
gains distributions.

Janus Tax-Exempt Money Market Fund  anticipates  that  substantially  all income
dividends it pays will be exempt from  federal  income tax.  However,  dividends
attributable  to interest on taxable  investments,  together with  distributions
from any net  realized  capital  gains,  are taxable.  In addition,  interest on
certain  private  activity  bonds  is a  preference  item  for  purposes  of the
individual and corporate  alternative minimum taxes. To the extent that the Fund
earns such income,  shareholders who are subject to the alternative  minimum tax
must include such income as a preference item. The Fund will advise shareholders
of the percentage of dividends,  if any, subject to the alternative minimum tax.

Dividends and capital gains distributions may also be subject to state and local
taxes. In certain states some portion of dividends and distributions  (depending
on the sources of the Fund's net income) of Janus  Tax-Exempt  Money Market Fund
may be exempt from state and local taxes.  Shareholders should 


JANUS MONEY MARKET FUNDS-INVESTOR SHARES PROSPECTUS            FEBRUARY 15, 1995
                                                   AS SUPPLEMENTED JULY 24, 1995

                                       7
<PAGE>

consult their own tax advisor regarding  exemption from any applicable state and
local tax, as well as the tax treatment of any dividends or  distributions  from
the Shares.  

The  Funds  intend  to comply  with  provisions  of the  Internal  Revenue  Code
applicable to investment companies,  and thus it is not expected that any of the
Funds  will be  required  to pay any  federal  income or excise  taxes.  The SAI
further explains the Funds' tax status.

PERFORMANCE

The  Shares  may  measure  performance  in  several  ways,   including  "yield,"
"effective yield," and "tax equivalent yield" (for Janus Tax-Exempt Money Market
Fund  only).  Yield is a way of showing  the rate of income  the Shares  earn on
investments  as a percentage of the Share price.  Yield  represents  the income,
less expenses generated by an investment,  in the Shares over a seven-day period
expressed as an annual percentage rate. Effective yield is similar 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.

Shares of Janus  Tax-Exempt  Money  Market  Fund may also  quote  tax-equivalent
yield, which shows the taxable yield an investor would have to earn before taxes
to equal such Shares'  tax-free yield. A  tax-equivalent  yield is calculated by
dividing  such  Shares'  tax-exempt  yield by the  result  of one minus a stated
federal tax rate.  Only that portion of the Fund's  income that is tax-exempt is
adjusted in this  calculation.  

Performance  figures are based upon  historical  results and are not intended to
indicate future performance.

From time to time in advertisements or sales material, the Funds may discuss the
Shares'  performance  ratings or other  information  as published by  recognized
statistical  or rating  services,  such as  Lipper  Analytical  Services,  Inc.,
IBC/Donoghue's  Money Fund Report,  Morningstar  or by  publications  of general
interest,  such as Forbes or  Money.  In  addition,  the Funds may  compare  the
Shares'  yield to those of certain  U.S.  Treasury  obligations  or other  money
market instruments.

MISCELLANEOUS INFORMATION

ORGANIZATION

Each Fund is an open-end management investment company registered under the 1940
Act as a series of the Trust,  which was created on February 11, 1986. Each Fund
currently  offers two  classes of shares by  separate  prospectuses.  The Shares
offered  by  this  Prospectus  are  available  to  the  general  public,   while
Institutional  Shares of each Fund are available only to institutional  clients,
including   corporations,   foundations  and  trusts,  meeting  certain  initial
investment  requirements.  Because the  expenses  of each class may differ,  the
performance  of each class is expected to differ.  If you would like  additional
information,  please call  1-800-525-3713.  

TRUSTEES  

The Trustees  oversee the business  affairs of the Trust and are responsible for
major decisions relating to each Fund's investment  objective and policies.  The
Trustees delegate the day-to-day  management of the Funds to the officers of the
Trust and meet quarterly to review the Funds' investment policies,  performance,
expenses and other business  affairs.  In approving the use of a single combined
prospectus,  the  Trustees  considered  the  possibility  that one Fund might be
liable for  misstatements in this Prospectus  regarding  information  concerning
another Fund. 

VOTING RIGHTS 

The Trust is not required to hold annual shareholder meetings.  However, special
meetings may be called for a specific  class of shares,  a specific Fund, or for
the Trust as a whole,  for  purposes  such as  electing  or  removing  Trustees,
terminating or reorganizing the Trust,  changing  fundamental policies or voting
on matters when required by the 1940 Act. Separate votes are taken by a separate
class of shares  only if a matter  affects  or  requires  the vote of just those
Shares.  Shareholders  are  entitled  to cast one vote for each  Share they own.

CUSTODIAN, TRANSFER AGENT AND DISTRIBUTOR

United Missouri Bank, N.A., P.O. Box 419226,  Kansas City, Missouri  64141-6226,
is the custodian of the Funds' assets. The custodian holds each Fund's assets in
safekeeping   and  collects  and  remits  the  income  thereon  subject  to  the
instructions of each Fund. 

Janus Service Corporation ("Janus Service"),  P.O. Box 173375, Denver,  Colorado
80217-3375, a wholly-owned subsidiary of Janus Capital, provides transfer agency
and shareholder services for the Funds.

Janus Distributors, Inc. ("Janus Distributors"), 100 Fillmore Street, Suite 300,
Denver,  Colorado 80206-4923,  a wholly-owned  subsidiary of Janus Capital, is a
distributor of the Shares.


JANUS MONEY MARKET FUNDS-INVESTOR SHARES PROSPECTUS            FEBRUARY 15, 1995
                                                   AS SUPPLEMENTED JULY 24, 1995

                                       8
<PAGE>

SHAREHOLDER'S MANUAL

HOW TO OPEN AN ACCOUNT

ESTABLISHING YOUR ACCOUNT

The New Account Application  enclosed with this Prospectus describes many of the
more common types of registrations,  as well as many of the options available to
you as a shareholder in the Funds.  A special  application is required for Janus
Individual  Retirement  Accounts  ("IRAs") and other  retirement plans described
under "Retirement Plans." After reviewing the appropriate application, carefully
complete,  sign and forward it, along with your check payable to Janus Funds, to
one of the addresses shown below:

Via Regular Mail                  Via Express Mail-Overnight Delivery
Janus Funds                       Janus Funds
P.O. Box 173375                   100 Fillmore Street, Suite 300
Denver, CO 80217-3375             Denver, CO 80206-4923

JANUS NO MINIMUM INITIAL INVESTMENT PROGRAM(R)

The  minimum  initial  investment  for most  regular  accounts is $1,000 and the
minimum initial investment for an IRA, Simplified Employee Pension Plan ("SEP"),
Profit Sharing or Money  Purchase  Pension Plan, or Uniform  Gifts/Transfers  to
Minors account (UGMA/UTMA) is $250. The minimum initial investment is waived for
Section 403(b)(7) plans that participate in the automatic group billing purchase
program and for accounts that elect the automatic  monthly investing option ($50
minimum monthly  payment).  If you discontinue the automatic  monthly  investing
option before your account reaches the required minimum initial investment, then
the Funds  reserve  the  right to close  your  account  in  accordance  with the
procedures described under "How to Redeem Shares." For more detailed information
on automatic monthly investing, see "How to Buy Shares."

RETIREMENT PLANS

If you  are  eligible,  you  may  set up  your  account  under  a  tax-sheltered
retirement  plan.  These  plans let you save for  retirement  and  shelter  your
investment  income from current income taxes. A contribution  to these plans may
be  deductible  from your  taxable  income,  depending  upon your  personal  tax
situation.  Distributions  from these  plans are  generally  subject to ordinary
income tax and may be subject to an additional 10% tax if withdrawn prior to age
59 1/2.  However,  you must start  withdrawals no later than April 1 of the year
after you reach age 70 1/2.

The following is a summary of types of plans and does not constitute tax advice.
You may wish to consult your tax advisor if you are  interested  in any of these
plans.  Because  income from Janus  Tax-Exempt  Money  Market Fund is  generally
tax-exempt, it is not available for a retirement plan.

o    Individual  Retirement  Account:  If you  are  under  age 70  1/2,  you can
     contribute up to the lesser of $2,000 or 100% of your compensation annually
     to an IRA. If your spouse is not employed,  you can contribute up to $2,250
     annually  to two IRAs in any  manner,  as long as no more  than  $2,000  is
     contributed to a single plan. Contributions to IRAs are tax deductible only
     if you and your  spouse are not covered by  existing  qualified  retirement
     plans or, if covered, your incomes do not exceed certain amounts.  However,
     whether your  contributions  are  deductible or not, the income and capital
     gains on your IRA are not taxed until they are withdrawn.  For details, see
     the  Janus  IRA  booklet,  which  is  available  upon  request  by  calling
     1-800-525-3713.

o    Simplified  Employee  Pension  Plan:  This is an  arrangement  that  allows
     employers  (including sole proprietors) to make contributions  toward their
     own and their  employees'  retirement  without  becoming  involved  in more
     complex  retirement  plans.  A SEP requires an IRA (a SEP-IRA) to be set up
     for each SEP participant.

o    Profit  Sharing or Money  Purchase  Pension  Plan:  These plans are open to
     corporations,  partnerships and sole proprietors to benefit their employees
     and themselves.

o    Section  403(b)(7) Plan:  Employees of educational  organizations  or other
     qualifying,  tax-exempt  organizations  may be eligible to participate in a
     Section 403(b)(7) Plan.

Investors Fiduciary Trust Company serves as custodian for the IRAs, SEPs, Profit
Sharing Plans,  Money Purchase Pension Plans and Section 403(b)(7) Plans offered
by the Funds. Such IRAs, SEPs or Plans are charged an annual fee of $12 per Fund
account,  including any account with any of the Janus funds.  There is a maximum
annual fee of $24 per  taxpayer  identification  number.  The annual fee usually
will be deducted during December of each year or upon redemption of the account,
or it may be paid anytime prior to its automatic  deduction from the account. In
lieu of the annual  fee,  a special  nonrefundable  lifetime  fee of $100 may be
paid.  This  fee  covers  all  retirement  accounts  discussed  above  that  are
maintained under the same taxpayer  identification  number with all of the Janus
funds, and carries over to spousal  beneficiaries  who transfer or roll over the
plan assets to a plan in their name upon the death of the  participant,  as long
as the accounts remain with Janus on a continuing basis. 

These  plans  require  the  completion  of a separate  application.  Please call
1-800-525-3713 for additional information.


JANUS MONEY MARKET FUNDS-INVESTOR SHARES PROSPECTUS            FEBRUARY 15, 1995
                                                   AS SUPPLEMENTED JULY 24, 1995

                                       9
<PAGE>

<TABLE>
- ------------------------------------------------------------------------------------------------------------------------------------
MINIMUM PURCHASE AMOUNTS
<CAPTION>
                                                                       Minimum Initial Purchase
Type of Account                   With Automatic Investing           Without Automatic Investing       Minimum Subsequent Investment
- ---------------                   ------------------------           ---------------------------       -----------------------------
<S>                                         <C>                                <C>                           <C>   
Regular Account                             $    0                             $1,000                        $   50
IRA/SEP Accounts                            $    0                             $  250                        $   50
Section 403(b)(7) Plans                     $    0*                            $  250                        $    0*
Other Pension Plans                         $    0                             $  250                        $   50
UGMA/UTMA                                   $    0                             $  250                        $   50
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

*Subject to participation in an automatic group billing purchase program.

The Funds  reserve the right to suspend  the  offering of shares for a period of
time and to reject any specific purchase request.
If you have any questions, please call 1-800-525-3713.

Taxpayer Identification Numbers

On the New Account  Application or other appropriate form, you must furnish your
Fund with your taxpayer  identification  number and state whether or not you are
subject  to  backup  withholding,   certified  under  penalties  of  perjury  as
prescribed by the Internal Revenue Code and  regulations.  Dividends and capital
gains  distributions in an account without proper  certification will be subject
to a 31% federal backup  withholding.  

Choosing a Distribution Option

When you fill out the application for your account,  you may choose from several
distribution options:

You may  invest  your  income  dividends  and  capital  gains  distributions  in
additional Shares.  This option is assigned  automatically if no other choice is
made. 

You may receive your income dividends and capital gains distributions in cash if
you make this selection on the application.

You may receive either your income  dividends or capital gains  distributions in
cash and reinvest the other in additional Shares.

You may change  your  distribution  option at any time by  writing  the Funds or
calling  1-800-525-3713.  This request for change must be received  prior to the
record date for the  distribution  being changed.  In addition,  you may provide
written instructions to automatically invest your dividends and/or capital gains
distributions into another previously  established account with any of the Janus
funds.  

HOW TO BUY SHARES

Additional Purchases From the Funds

Once you have opened a Janus funds account,  you may purchase  additional Shares
($50 minimum) for such account or open  additional  accounts with other Funds at
any time through a number of different  methods  described  below.  Purchases to
403(b)(7)  Plans are generally made by the employer  through an automatic  group
billing purchase program. 

Through Automatic Monthly  Investing:  Automatic monthly investing allows you to
authorize  your Fund to debit your bank  account  monthly  for the  purchase  of
Shares.  The minimum  monthly payment under the automatic  investing  program is
$50. To establish the automatic monthly investing option, complete the Automatic
Investing  section of the  application  and include a voided,  unsigned check or
deposit slip from the bank account to be debited or call  1-800-525-3713 for the
appropriate  form if your  account is already set up. 

By Payroll  Deduction:  This option  allows you to have all or a portion of your
paycheck  invested  directly into your Fund account.  To obtain  information  on
establishing  this  program,  call  1-800-525-3713.  Purchases  through  payroll
deduction are employer  initiated and Janus cannot establish this option for the
investor.  

By Mail: When sending payments for additional purchases by mail, please note the
numbers  for  your  Fund  and your  account(s)  on the  check  and  include  the
remittance stub from a confirmation statement. On additional purchases for IRAs,
SEPs,  Profit Sharing or Money Purchase  Pension  accounts,  be sure to indicate
whether the payment is a rollover or a regular contribution.  If it is a regular
contribution, indicate the year for which the contribution is being made.

Your  check  should be made  payable  to Janus  Funds and sent as  follows:  

Via Regular Mail 
Janus Funds 
P.O. Box 173375  
Denver, CO 80217-3375  

Via Express Mail-Overnight Delivery 
Janus Funds 
100 Fillmore Street, Suite 300 
Denver, CO 80206-4923  

By Wire:  Purchases  by wire may be  accepted  only for  additions  to  existing
accounts. Please call 1-800-525-3713 for current wire instructions.

By Systematic  Exchanges:  You may invest regularly into one or more established
accounts  with any of the Janus funds by  systematically  exchanging  a specific
dollar amount ($50 minimum) from another account in the Funds. The exchanges are
processed  automatically any day of the month.  Please call  1-800-525-3713  for
information on how to establish this option.  

Purchases Through Broker-Dealers

You may also purchase and sell Shares of the Funds  through some  broker-dealers
and other Processing  Organizations (as defined below).  Although broker-dealers
will sell and redeem  Shares at net asset  value,  they may charge you a fee for
this  service.  


JANUS MONEY MARKET FUNDS-INVESTOR SHARES PROSPECTUS            FEBRUARY 15, 1995
                                                   AS SUPPLEMENTED JULY 24, 1995

                                       10
<PAGE>

Net Asset Value

The net asset  value  ("NAV")  of the Shares is  determined  at the close of the
regular trading session of the New York Stock Exchange  (normally 4:00 p.m., New
York time) each day that the Exchange 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 a Fund's 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.  

Paying for Your Shares 

Purchase  orders  accompanied by a check or other  negotiable bank draft will be
accepted  and  effected  as of 4:00 p.m.  (New York time) on the day of receipt.
Purchase  orders  received by wire transfer in the form of Federal funds will be
processed at the NAV per share as  determined at the close of the New York Stock
Exchange next occurring after your order is received and accepted. All purchases
should be made in U.S. dollars and checks should be drawn on U.S. banks and made
payable to Janus Funds.  Cash, credit cards,  third party checks and credit card
checks will not be accepted.  

The  Funds  reserve  the  right  to  cancel  any  purchase  if  payment  for the
transaction  does not  clear or the  amount of the  purchase  is  otherwise  not
collected.  If the Funds are unable to debit your  predesignated bank account on
the day of  purchase,  they may make  additional  attempts to do so. You will be
responsible  for any  fees  imposed  by your  bank  and for  losses  that may be
incurred as a result of any decline in the value of the canceled purchase. Janus
Service and the Funds shall have authority to act as your agent to redeem shares
in your  account(s)  in order to cover any such  losses due to  fluctuations  in
Share  price.  Any profit on such  cancellation  will  accrue to the Fund.  When
purchases are made by check or automatic monthly investment,  your Fund may hold
payments on redemptions until the investment being redeemed has been held in the
account for 15 days. 

Share Certificates 

Share  certificates  are not  available  for the Shares in order to maintain the
general  liquidity  that is  representative  of a money  market fund and to help
facilitate  transactions  in shareholder  accounts.  

HOW TO EXCHANGE SHARES

The Janus funds include  several funds with a variety of investment  objectives.
You may  exchange  your  Shares  for  shares  of any  other  Janus  fund that is
available to the public and registered in your state of residence. 

Exchanges may be made in writing or by telephone. See "How to Redeem Shares" for
signature  requirements on written instructions.  All accounts are automatically
eligible for the telephone exchange privilege. 

Important Points to Remember When Making Exchanges:

o    Be sure to read the  prospectus of the fund into which you want to exchange
     and carefully consider that fund's investment objective. 

o    Exchanges  may be made  only in  amounts  of  $1,000  or  more,  or for the
     complete  value of the  account if less than  $1,000.  

o    You may make up to four exchanges out of each of the non-money market Janus
     funds during the calendar  year.  This limit helps  minimize the disruptive
     effect of redemptions on each fund's net asset base and reduces each fund's
     administrative  expenses.  There is currently no limit on exchanges  out of
     the Shares  described in this  prospectus.  

o    Exchanges  are  effected  at the NAV next  determined  after  the  exchange
     request is received. 

o    Each exchange  represents the sale of shares from one fund and the purchase
     of shares in another,  which may produce a gain or loss for federal  income
     tax  purposes.  Because the Funds seek to maintain a stable net asset value
     per  Share,  it is not  anticipated  that a sale of Shares  will  produce a
     taxable gain or loss.  

o    If you have  received  certificates  for shares of non-money  market funds,
     exchanges  may not be made until those  certificates  are  returned to your
     fund in proper form. 

o    Exchanges will be accepted only if the  registration of the two accounts is
     identical.  

The Funds  reserve  the right to reject any  exchange  request  and to modify or
terminate the exchange  privilege at any time.  

HOW TO REDEEM SHARES

Partial or Complete Redemptions

You may redeem all or a portion of your Shares on any  business day that the New
York Stock Exchange is open.  Please note that same-day wire redemptions are not
available  on banking  holidays.  Your  Shares  will be redeemed at the next NAV
calculated  after your Fund has received your  redemption  request in good order
and meeting all the requirements of this Prospectus. Shareholders who redeem all
their  Shares in a Fund will receive the NAV of such Shares and all declared but
unpaid  dividends  on such  Shares.  Payment  will be made within  seven days of
receipt of a valid redemption  request. 

If payment for the Shares  being  redeemed  has been made by check or  automatic
monthly investment,  the Funds may delay the mailing of your redemption proceeds
for up to 15 days to allow the purchase payment to clear.

In Writing:  To redeem all or part of your  Shares in writing,  send a letter of
instruction as follows:  

Via Regular Mail 
Janus Funds 
P.O. Box 173375 
Denver, CO 80217-3375 

Via Express Mail-Overnight Delivery 
Janus Funds 
100 Fillmore Street, Suite 300 
Denver, CO 80206-4923 

The letter should specify the name of your Fund, the number of Shares or dollars
being redeemed,  the account number,  the name(s) on the account,  your name and
your daytime  


JANUS MONEY MARKET FUNDS-INVESTOR SHARES PROSPECTUS            FEBRUARY 15, 1995
                                                   AS SUPPLEMENTED JULY 24, 1995

                                       11
<PAGE>

telephone  number.  Please  also  note the  following  signature  and  signature
guarantee  requirements  on  redemption  requests  that  apply  to your  type of
account: 

o    Individual,  Joint Tenants, Tenants in Common: Letter of instruction signed
     by each person included in the registration, exactly as the names are shown
     on the account.

o    Custodian:  Letter of instruction  signed by the custodian exactly as shown
     in the registration and indicating his/her capacity as custodian.

o    Sole  Proprietor,  General  Partner:  Letter of  instruction  signed by the
     authorized individual(s) and indicating their capacity.

o    Corporation,  Association:  Letter of  instruction  signed by the person(s)
     authorized  to act on the  account  and a  current  certified  copy  of the
     corporate resolution.

o    Trust:  Letter of instruction signed by the trustee(s).  If the name of the
     trustee(s)  does  not  appear  in  the  registration  of  the  account,   a
     certificate of incumbency dated within 60 days must also be submitted.

o    IRA:  Letter  of  instruction  signed  by  the  account  owner  exactly  as
     registered.  If you do not want  federal  income  tax  withheld  from  your
     redemption,  your  letter  must  state  that  you  elect  not to have  such
     withholding  apply.  In  addition,  your  letter  must  state  whether  the
     distribution is normal (after age 59 1/2) or premature  (before age 59 1/2)
     and if premature,  whether any exceptions such as death or disability apply
     with regard to the 10% additional tax on early distributions.

o    Other  Registrations (not included above):  Please call  1-800-525-3713 for
     further  instructions.  

In addition to the above requirements,  a signature guarantee is required if the
redemption: 

o    exceeds $100,000, or

o    is being made payable other than exactly as registered, or

o    is being mailed to an address which has been changed  within 10 days of the
     redemption request, or

o    is being mailed to an address other than the one on record.

The  Funds  reserve  the right to  require a  signature  guarantee  under  other
circumstances or to reject or delay a redemption on certain legal grounds.

A signature  guarantee is a widely  accepted way to protect you and the Funds by
verifying  the  signature  on your  request.  The Funds will  honor a  signature
guarantee from acceptable financial institutions such as banks, savings and loan
associations,  trust companies,  credit unions, brokers and dealers,  registered
securities  associations and clearing agencies. A signature guarantee may not be
provided by a notary public.  If you live outside the United  States,  a foreign
bank  properly  authorized to do business in your country of residence or a U.S.
Consulate may be able to authenticate your signature.

By Telephone:  Shares in non-retirement accounts and IRAs automatically have the
telephone  redemption  privilege unless this option has been declined in writing
on the New Account Application.  Existing  shareholders may contact the Funds in
writing or by calling 1-800-525-3713 to decline this privilege.  Please have the
following  information  available  when you place  your  call:  account  number,
registration,  address,  social security number and pre-authorized  bank account
information (if applicable).

Proceeds of the  redemption  will be mailed by check to the account  name(s) and
address exactly as registered or wired to a pre-authorized  bank account. If you
are opening a new account,  you may establish the wire redemption  option on the
New Account  Application  form. If you would like to establish this option on an
existing account,  please call 1-800-525-3713 for additional information and the
proper form. Wire  redemptions are not available for IRA accounts.  To receive a
specific  day's NAV,  your call must be received  before that day's close of the
New York Stock Exchange.  

If a request for a wire  redemption is received by 3:00 p.m. (New York time) for
Janus Money  Market and Janus  Government  Money  Market Funds and by 12:00 p.m.
(New York time) for Janus Tax-Exempt Money Market Fund,  Shares will be redeemed
and the redemption amount wired to the shareholder's bank account on record that
day, although that day's dividends will not be received.  After 3:00 p.m. (12:00
p.m. for Janus  Tax-Exempt  Money  Market  Fund),  a redemption  request will be
processed at that day's NAV and will include that day's dividends, but generally
will not be wired until the next  business  day.  

There is a maximum of $100,000 per day on telephone  redemptions by check. There
is no limitation on  redemptions by wire;  however,  there is an $8 wire fee for
each wire and your bank may charge an  additional  fee to receive  the wire.  

By Electronic Transfer:  Shares may also be redeemed by electronic transfer to a
pre-authorized  bank  account.  There  is no  charge  for this  service  and the
redemption  will  normally  take two to three  business  days to reach  the bank
account on record.  This option can be added to an  existing  account by calling
1-800-525-3713  for the proper form. 

By the Fund: Your account may be terminated by your Fund if, due to the exchange
or redemption of Shares,  the value of the remaining Shares in your account,  at
the  current  NAV,  falls below the  minimum  investment  required to open a new
account,  or if the automatic  monthly  investing option is discontinued  before
that  minimum  is  attained,  or if you  engage  in  illegal  or  other  conduct
detrimental to the Funds.  In the case of  insufficient  account size, your Fund
will  notify you that you have 60 days to increase  your  account to the minimum
required,  or to  reactivate  the automatic  monthly  investing  option,  before
redeeming your account.  

Systematic Withdrawals 

If you have a regular  account or are eligible for normal  distributions  from a
retirement plan, you may establish a systematic  withdrawal program.  Systematic
withdrawals  allow  you to  redeem  a fixed  sum at  regular  intervals.  If you
exchange all Shares out of an account on which the systematic withdrawal program
is in effect and you want to continue receiving systematic withdrawals, you will
need to provide  specific  instructions  to continue that program on the account
into which you exchange. Please call 1-800-525-3713 for additional information.


JANUS MONEY MARKET FUNDS-INVESTOR SHARES PROSPECTUS            FEBRUARY 15, 1995
                                                   AS SUPPLEMENTED JULY 24, 1995

                                       12
<PAGE>

SPECIAL SHAREHOLDER SERVICES AND OTHER INFORMATION

Check Writing  Privilege:  Check writing  privileges are available for all three
Funds.  Checkbooks will be issued to shareholders  who have completed the proper
section of the New Account  Application or who have completed a Signature  Draft
Card,  which is  available by calling  1-800-525-3713.  Your  checkbook  will be
mailed  approximately  10 days after the check  writing  privilege is requested.
Checks  may be  written  for any  amount  over but not less than $250 per check.
Purchases made by check or the Automatic Monthly  Investment  program may not be
redeemed by a  redemption  check  until the 15-day  hold period has passed.  All
checks  written on the  account  must be signed by all  account  holders  unless
otherwise  specified on the original  application  or the  subsequent  Signature
Draft Card. The Funds reserve the right to terminate or modify the check writing
privilege at any time. 

Janus Electronic Telephone Service ("JETS")(R) 

JETS(R)  offers  you  24-hour  access  by  TouchTone(TM)   telephone  to  obtain
information  on your account  balance,  to confirm your last  transaction or the
last  dividend  posted  to your  account,  to  order  duplicate  account  or tax
statements,  to  reorder  checks or to  exchange  your  Shares.  JETS(R)  can be
accessed  by  calling  1-800-525-6125.  Calls on  JETS(R)  are  limited to seven
minutes.  For more  information and an update on services  provided  through the
automated system,  please call 1-800-525-3713.  

During  periods of  unusual  market or  economic  activity,  you may  experience
difficulty in reaching an investor service  representative  by telephone for the
purpose of  redeeming  or  exchanging  your  Shares,  due to the volume of calls
initiated by other  shareholders.  To alleviate any  potential  problems in that
regard, JETS(R) may be used to facilitate exchanges only. You should be mindful,
however, that your Fund will process written instructions when received, even if
you reach the Funds by telephone with alternate  instructions  prior to the time
your Fund receives your written  instructions.  

Telephone Instructions

You may initiate many transactions by telephone. The Funds and their agents will
not be responsible for any losses resulting from unauthorized  transactions when
procedures designed to verify the identity of the caller are followed.  

Investor Service Centers  

Investor  Service Centers have been  established in Denver,  Colorado and Kansas
City,  Missouri for the convenience of those people living in or visiting either
of those areas who want to discuss the Funds or their accounts in person with an
investor service representative.  The addresses for the Investor Service Centers
are: 

100 Fillmore Street, Suite 100 
Denver, Colorado 80206 

3773 Cherry Creek North Drive, Suite 101 
Denver, Colorado 80209 

1004 Baltimore Ave., Suite 100
Kansas City, Missouri 64105 

The Investor  Service  Centers are generally open during normal  business hours.
Please  call  1-800-525-3713  for  details.   

Transactions Through Processing Organizations

Shares  of the  Funds  may be  purchased  and  redeemed  through  a  "Processing
Organization," which is a broker-dealer,  bank or other financial institution,
or an organization that provides recordkeeping and consulting services to 401(k)
plans or  other  qualified  plans,  that  purchases  shares  for its  customers.
Processing  Organizations  may charge you a fee for this service and may require
different minimum initial and subsequent investments than the Funds.  Processing
Organizations  may also impose other charges and  restrictions in addition to or
different  from those  applicable  to  shareholders  who  invest  with the Funds
directly.  The Processing  Organization,  rather than its customers,  may be the
shareholder  of record.  The Funds are not  responsible  for the  failure of any
Processing  Organization to carry out its obligations to its customers.  

Certain  Processing  Organizations may receive  compensation from the Funds, the
Funds' transfer agent,  Janus Capital or their  affiliates.  

Account Address and Name  Changes 

To change the address on your  account,  you may call the number below or send a
written request signed by all registered owners of your account.  Please include
the name of your Fund(s), the account number(s),  the name(s) on the account and
both the old and new addresses. Within the first 10 days of an address change, a
written  redemption  request must be  accompanied  by a signature  guarantee and
telephone redemptions are permissible only if the redemption proceeds are wired.
See "How to Redeem Shares." 

To change  the name on an  account,  the  Shares  must be  transferred  to a new
account.  Such  a  change  generally  requires  written  instructions  with  the
guaranteed  signatures  of all  registered  owners,  as  well  as a New  Account
Application  and supporting  legal  documentation,  if  applicable.  Please call
1-800-525-3713 for additional information. 

Statements and Reports 

Your Fund will send a statement of your  account  after every  transaction  that
affects  your  account  balance  or  your  account  registration.  Generally,  a
statement with tax  information  will be mailed to you on or before January 31st
of each  year,  a copy of which  will also be filed  with the  Internal  Revenue
Service. Twice each year you will receive the financial statements of the Funds,
including  a  statement  listing  the  Funds'  portfolio  securities.  To reduce
expenses,  only one copy of most Fund reports (such as the Funds' Annual Report)
may be  mailed  to all  accounts  with the same  social  security  number.  Upon
request,  such  reports  will be mailed to all  accounts in the same  household.
Please call 1-800-525-3713 if you need additional reports sent each time.

Temporary Suspension of Services

The Funds or their agents may temporarily  suspend  telephone  transactions  and
other shareholder  services  described in this Prospectus upon reasonable notice
or to the extent  that any  circumstance  reasonably  beyond the  control of the
Funds or their agents materially hampers the provision of such services.


JANUS MONEY MARKET FUNDS-INVESTOR SHARES PROSPECTUS            FEBRUARY 15, 1995
                                                   AS SUPPLEMENTED JULY 24, 1995

                                       13



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