FILED PURSUANT TO RULE 424(b)(3) AND (c)
FILE NUMBER 333-61413
TWENTY-THIRD PROSPECTUS SUPPLEMENT TO PROSPECTUS
DATED AUGUST 24, 1998
8,370,248 SHARES
LYCOS, INC.
COMMON STOCK
This Twenty-Third Prospectus Supplement (the "Twenty-First Prospectus
Supplement") supplements the Prospectus dated August 24, 1998 (the
"Prospectus"), the Prospectus Supplement dated September 15, 1998 (the "First
Prospectus Supplement"), the Second Prospectus Supplement dated October 28, 1998
(the "Second Prospectus Supplement"), the Third Prospectus Supplement dated
November 12, 1998 (the "Third Prospectus Supplement"), the Fourth Prospectus
Supplement dated November 18, 1998 (the "Fourth Prospectus Supplement"), the
Fifth Prospectus Supplement dated November 19, 1998 (the "Fifth Prospectus
Supplement"), the Sixth Prospectus Supplement dated December 1, 1998 (the "Sixth
Prospectus Supplement"), the Seventh Prospectus Supplement dated December 2,
1998 (the "Seventh Prospectus Supplement"), the Eighth Prospectus Supplement
dated December 4, 1998 (the "Eighth Prospectus Supplement"), the Ninth
Supplement dated December 21, 1998 (the "Ninth Prospectus Supplement"), the
Tenth Prospectus Supplement dated December 28, 1998 (the "Tenth Prospectus
Supplement"), the Eleventh Prospectus Supplement dated January 14, 1999 (the
"Eleventh Prospectus"), the Twelfth Prospectus Supplement dated February 12,
1999 (the "Twelfth Prospectus Supplement"), the Thirteenth Prospectus Supplement
dated March 2, 1999 (the "Thirteenth Prospectus Supplement"), the Fourteenth
Prospectus Supplement dated March 25, 1999 (the "Fourteenth Prospectus
Supplement"), the Fifteenth Prospectus Supplement dated April 27, 1999 (the
"Fifteenth Prospectus"), the Sixteenth Prospectus Supplement dated June 16, 1999
(the "Sixteenth Prospectus Supplement"), the Seventeenth Prospectus Supplement
dated July 6, 1999 (the "Seventeenth Prospectus Supplement"), the Eighteenth
Prospectus Supplement dated July 8, 1999 (the "Eighteenth Prospectus
Supplement"), the Nineteenth Prospectus Supplement dated July 19, 1999 (the
"Nineteenth Prospectus Supplement"), the Twentieth Prospectus Supplement dated
August 26, 1999 (the "Twentieth Prospectus Supplement", the Twenty-First
Prospectus Supplement dated September 9, 1999 (the "Twenty-First Prospectus
Supplement") and the Twenty-Second Prospectus Supplement dated September 17,
1999 (the "Twenty-Second Prospectus Supplement") of Lycos, Inc. ("Lycos" or the
"Company") relating to the public offering, which is not being underwritten, and
sale of up to 8,370,248 shares of Common Stock, par value $0.01 per share (the
"Shares") of the Company, which may be offered and sold from time to time by
certain stockholders of the Company or by pledgees, donees, transferees or other
successors in interest that receive such shares as a gift, partnership
distribution or other non-sale related transfer (the "Selling Stockholders").
The Company will receive no part of the proceeds of such sales. The Shares were
originally issued or reserved for issuance by the Company in connection with the
Company's acquisition of WhoWhere? Inc., a California corporation, by and
through a merger of a wholly-owned subsidiary of Lycos, What Acquisition Corp.,
with and into WhoWhere? Inc. (the "Acquisition"). The "Selling Stockholders"
Section of the Prospectus, the First Prospectus Supplement, the Second
Prospectus Supplement, the Third Prospectus Supplement, the Fourth Prospectus
Supplement, the Fifth Prospectus Supplement, the Sixth Prospectus Supplement,
the Seventh Prospectus Supplement, the Eighth Prospectus Supplement, the Ninth
Prospectus Supplement, the Tenth Prospectus Supplement, the Eleventh Prospectus
Supplement, the Twelfth Prospectus Supplement, the Thirteenth Prospectus
Supplement, the Fourteenth Prospectus Supplement, the Fifteenth Prospectus
Supplement, the Sixteenth Prospectus Supplement, the Seventeenth Prospectus
Supplement, the Eighteenth Prospectus Supplement, the Nineteenth Prospectus
Supplement, the Twentieth Prospectus Supplement, the Twenty-First Prospectus
Supplement and the Twenty-Second Prospectus Supplement are hereby supplemented
to reflect the gift made by Mark A. Wolfson to Stanford University in the amount
of 1,000 shares after the date of the Prospectus, the First Prospectus
Supplement, the Second Prospectus Supplement, the Third Prospectus Supplement,
the Fourth Prospectus Supplement, the Fifth Prospectus Supplement, the Sixth
Prospectus Supplement, the Seventh Prospectus Supplement, the Eighth Prospectus
Supplement, the Ninth Prospectus Supplement, the Tenth Prospectus Supplement,
the Eleventh Prospectus Supplement, the Twelfth Prospectus Supplement, the
Thirteenth Prospectus Supplement, the Fourteenth Prospectus Supplement, the
Fifteenth Prospectus Supplement, the Sixteenth Prospectus Supplement, the
Seventeenth Prospectus Supplement, the Eighteenth Prospectus Supplement, the
Nineteenth Prospectus Supplement, the Twentieth Prospectus Supplement, the
Twenty-First Prospectus Supplement and the Twenty-Second Prospectus Supplement.
This Twenty-Third Prospectus Supplement should be read in conjunction with the
Prospectus, the First Prospectus Supplement, the Second Prospectus Supplement,
the Third Prospectus Supplement, the Fourth Prospectus Supplement, the Fifth
Prospectus Supplement, the Sixth Prospectus Supplement, the Seventh Prospectus
Supplement, the Eighth Prospectus Supplement, the Ninth Prospectus Supplement,
the Tenth Prospectus Supplement, the Eleventh Prospectus Supplement, the Twelfth
Prospectus Supplement, the Thirteenth Prospectus Supplement, the Fourteenth
Prospectus Supplement, the Fifteenth Prospectus Supplement, the Sixteenth
Prospectus Supplement, the Seventeenth Prospectus Supplement, the Eighteenth
Prospectus Supplement, the Nineteenth Prospectus, the Twenty-First Prospectus
Supplement and is qualified by reference to the Prospectus, the First Prospectus
Supplement, the Second Prospectus Supplement, the Third Prospectus Supplement,
the Fourth Prospectus Supplement, the Fifth Prospectus Supplement, the Sixth
Prospectus Supplement, the Seventh Prospectus Supplement, the Eighth Prospectus
Supplement, the Ninth Prospectus Supplement, the Tenth Prospectus Supplement,
the Eleventh Prospectus Supplement, the Twelfth Prospectus Supplement, the
Thirteenth Prospectus Supplement, the Fourteenth Prospectus Supplement, the
Fifteenth Prospectus Supplement, the Sixteenth Prospectus Supplement, the
Seventeenth Prospectus Supplement, the Eighteenth Prospectus Supplement, the
Nineteenth Prospectus Supplement, the Twentieth Prospectus Supplement, the
Twenty-First Prospectus Supplement and the Twenty-Second Prospectus Supplement,
except to the extent that the information herein contained supersedes the
information contained in the Prospectus, the First Prospectus Supplement, the
Second Prospectus Supplement, the Third Prospectus Supplement, the Fourth
Prospectus Supplement, the Fifth Prospectus Supplement, the Sixth Prospectus
Supplement, the Seventh Prospectus Supplement, the Eighth Prospectus Supplement,
the Ninth Prospectus Supplement, the Tenth Prospectus Supplement, the Eleventh
Prospectus Supplement, the Twelfth Prospectus, the Thirteenth Prospectus
Supplement, the Fourteenth Prospectus Supplement, the Fifteenth Prospectus
Supplement, the Sixteenth Prospectus Supplement, the Seventeenth Prospectus
Supplement, the Eighteenth Prospectus Supplement, the Nineteenth Prospectus
Supplement, the Twentieth Prospectus Supplement, the Twenty-First Prospectus
Supplement and the Twenty-Second Prospectus Supplement. Capitalized terms used
in this Twenty-Third Prospectus Supplement and not otherwise defined herein have
the meanings specified in the Prospectus.
<PAGE>
THE DATE OF THIS TWENTY-THIRD PROSPECTUS SUPPLEMENT IS
OCTOBER 6, 1999
SELLING STOCKHOLDERS
On September 30, 1999, of the Shares beneficially owned by Mark A.
Wolfson reflected in the Prospectus and the supplements thereto, 1,000 of which
were gifted to Stanford University. The table of Selling Stockholders in the
Prospectus and the supplements thereto are hereby amended to reflect such gift
and supplemented to specifically include Shares received in such gift.
