MAINSTAY FUNDS
497, 2001-01-04
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                             THE MAINSTAY(R) FUNDS
                        Supplement dated January 4, 2001
                         To the Prospectus dated May 1,
                 2000 (as previously supplemented on August 30,
                           2000 and December 29, 2000)

Effective January 4, 2001, The MainStay(R) Funds (the "Trust") has added two new
series to the Trust:  MainStay Mid Cap Growth Fund and MainStay Select 20 Equity
Fund.  Both  series  use  different  strategies  to pursue  their  objective  of
long-term growth of capital.

Shareholders  of the new series have the ability to exchange  shares of MainStay
Mid Cap Growth  Fund and  MainStay  Select 20 Equity Fund for shares of the same
class of any other  series of the  Trust and  shareholders  of each of the other
series of the Trust may  exchange  their  shares for shares of the same class of
MainStay  Mid Cap Growth Fund and  MainStay  Select 20 Equity  Fund.  A complete
description of exchange  privileges  appears in the May 1, 2000  Prospectus (the
"Prospectus") of the Trust.

You  may  obtain  a  complete  Prospectus  for the two  new  series  by  calling
1-800-624-6782.

Also,  effective  January  4,  2001,  New York Life  Investment  Management  LLC
("NYLIM") is substituted for MainStay Management LLC ("MainStay  Management") as
the Trust's  Manager.  In addition,  the funds currently  sub-advised by Monitor
Capital  Advisors  LLC  ("Monitor  Capital")  (MainStay  Equity  Index Fund) and
Madison Square Advisors LLC ("Madison  Square")  (MainStay Growth  Opportunities
Fund) will be advised by NYLIM directly, without a sub-adviser.  NYLIM, MainStay
Management,   Monitor   Capital,   and  Madison  Square  are  all   wholly-owned
subsidiaries of New York Life Insurance Company ("New York Life"). These changes
reflect a restructuring of the investment  management business of New York Life,
and will not affect the  investment  personnel  responsible  for  managing  each
series of the Trust's investments or any other aspect of the Trust's operations.

The following portfolio managers'  biographies are added to the section entitled
"Know With Whom  You're  Investing  --  Portfolio  Managers"  in the May 1, 2000
prospectus of The MainStay Funds:

MR.  MATTHEW PHILO is a portfolio  manager of the MainStay High Yield  Corporate
Bond  Fund.   Mr.  Philo,   a  Director  of  MacKay  Shields  LLC,  has  managed
institutional  accounts for MacKay Shields since September of 1996. From 1993 to
September  1996,  Mr. Philo was with  Thorsell,  Parker  Partners as a portfolio
manager and partner.

MR.  EDWARD  SILVERSTEIN  has  managed  the  Convertible  Fund since  2001.  Mr.
Silverstein  joined  MacKay  Shields in 1998 as an Associate  and was a Research
Analyst in the Equity Division.  He became an Associate  Director in 2000. Prior
to joining MacKay Shields,  Mr.  Silverstein was a portfolio manager at The Bank
of New York from 1995 to 1998.




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