SUPPLEMENT DATED JULY 16, 1998
TO SUPPLEMENTS DATED MAY 22,
MAY 4, APRIL 3, APRIL 1, MARCH 23,
FEBRUARY 25, AND JANUARY 21, 1998,
AND DECEMBER 19, 1997,
TO PROSPECTUS DATED NOVEMBER 26, 1997
COSTCO COMPANIES, INC.
The following table sets forth certain information as of July 16, 1998 as
to the security ownership of the person named below, whose predecessor was named
as a Selling Securityholder in the prospectus dated November 26, 1997
("Prospectus"), as supplemented on December 19, 1997, or January 21, February
25, March 23, April 1, April 3, May 4, and May 22, 1998.
Face Amount of Notes Shares of Common Stock
Owned Prior to Owned Prior to
Selling Securityholder Offering($) Offering(1)
- ---------------------- -------------------- ----------------------
Warburg Dillon Read LLC(2) $21,550,000 (3) 244,689
(1) Includes the Shares into which the Notes are convertible.
(2) The Selling Securityholder became the successor to SBC Warburg Dillon
Read Inc. in connection with the merger of Swiss Bank Corporation and Union Bank
of Switzerland into a new entity, UBS A.G., on June 29, 1998. The Selling
Securityholder is the investment adviser to UBS A.G. - London Branch, whose
predecessor, Swiss Bank Corporation - London Branch, was named as a Selling
Securityholder in the Prospectus dated November 26, 1997, as supplemented.
(3) Includes securities previously registered in the name of SBC Warburg
Dillon Read Inc.
The date of this Prospectus Supplement is July 16, 1998.
