FIFTH SUPPLEMENT DATED APRIL 1, 1998
TO FOURTH SUPPLEMENT DATED MARCH 23, 1998,
THIRD SUPPLEMENT DATED FEBRUARY 25, 1998,
SECOND SUPPLEMENT DATED JANUARY 21, 1998,
PROSPECTUS SUPPLEMENT DATED DECEMBER 19, 1997,
AND PROSPECTUS DATED NOVEMBER 26, 1997
COSTCO COMPANIES, INC.
The following table sets forth certain information as of April 1, 1998,
as to the security ownership of persons not named as Selling Securityholders in
the Prospectus dated November 26, 1997 ("Prospectus") or the Prospectus
Supplements dated December 19, 1997, or January 21, February 25, or March 23,
1998.
<TABLE>
<CAPTION>
Face Amount of Notes Owned Shares of Common Stock
Prior to Offering Owned Prior
<S> <C> <C>
Selling Securityholder to Offering (1)
- ---------------------- ---------------
Oppenheimer Bond Fund for Growth $8,000,000 90,836
Massachusets Mutual Life Insurance Company $3,300,000 37,469
MassMutual Corporate Value Partners Limited c/o Bank America $1,000,000 11,354
Trust & Banking Corporation (Cayman) Limited
MassMutual High Yield Partners LLC $1,150,000 13,057
MassMutual Corporate Investors $200,000 2,270
MassMutual Participation Investors $225,000 2,554
- ---------------------------------------
(1) Includes the Shares into which the Notes are convertible.
The date of this Prospectus Supplement is
April 1, 1998.
</TABLE>
