FILED PURSUANT TO RULE 424(b)(3) AND (c)
FILE NUMBER 333-61413
NINETEENTH PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED AUGUST 24, 1998
4,185,124 SHARES
LYCOS, INC.
COMMON STOCK
This Nineteenth Prospectus Supplement (the "Nineteenth 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") and Eighteenth
Prospectus Supplement dated July 8, 1999 (the "Eighteenth Prospectus
Supplement") of Lycos, Inc. ("Lycos" or the "Company") relating to the public
offering, which is not being underwritten, and sale of up to 4,185,124 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
<PAGE>
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 and the Eighteenth
Prospectus Supplement are hereby supplemented to reflect (i) the gift made by
Mark A. Wolfson to Stanford University in the amount of 1,000 shares, (ii) the
gift made by Thomas C.K. Yuen to UCI Foundation in the amount of 1,315 shares
and (iii) the gift made by Safi Quershey Family Trust to Pomona College in the
amount of 700 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 and the Eighteenth Prospectus Supplement. This
Nineteenth 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 and the Eighteenth
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 and the Eighteenth
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 and the Eighteenth Prospectus Supplement.
Capitalized terms used in this Nineteenth Prospectus Supplement and not
otherwise defined herein have the meanings specified in the Prospectus.
<PAGE>
THE DATE OF THIS NINETEENTH PROSPECTUS SUPPLEMENT IS JULY 19, 1999
SELLING STOCKHOLDERS
On July 12, 1999, one thousand (1,000) of the Shares beneficially owned
by Mark A. Wolfson reflected in the Prospectus and the supplements thereto were
gifted to Stanford University. On June 25, 1999, one thousand three hundred
fifteen (1,315) of the Shares beneficially owned by Thomas C.K. Yuen reflected
in the Prospectus and the supplements thereto were gifted to UCI Foundation. On
July 3, 1999, seven hundred (700) of the Shares beneficially owned by Safi
Quershey Family Trust reflected in the Prospectus and the supplements thereto
were gifted to Pomona College. The table of Selling Stockholders in the
Prospectus and the supplements thereto are hereby amended to reflect such gifts
and supplemented to specifically include Shares received in such gifts.
<PAGE>
