YAHOO INC
S-3, 1997-11-05
COMPUTER INTEGRATED SYSTEMS DESIGN
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<PAGE>


As filed with the Securities and Exchange Commission on November 5, 1997
                                                 Registration No. 333- - 
- ------------------------------------------------------------------------
- ------------------------------------------------------------------------
                          SECURITIES AND EXCHANGE COMMISSION
                                WASHINGTON, D.C. 20549
                                ----------------------
                                       FORM S-3
                               REGISTRATION STATEMENT 
                           UNDER THE SECURITIES ACT OF 1933
                                           
                                     YAHOO! INC.
                (Exact Name of Registrant as specified in its charter)
                                           
             CALIFORNIA                           77-0398689
    (State of incorporation)      (I.R.S. Employer Identification No.)
                          3400 CENTRAL EXPRESSWAY, SUITE 201
                            SANTA CLARA, CALIFORNIA 95051
                                    (408) 731-3300
(Address, including zip code, and telephone number, including area code, of
Registrant's principal executive offices)

                                    TIMOTHY KOOGLE
                        PRESIDENT AND CHIEF EXECUTIVE OFFICER
                          3400 CENTRAL EXPRESSWAY, SUITE 201
                            SANTA CLARA, CALIFORNIA 95051
                                    (408) 731-3300
(Name, address, including zip code, and telephone number, including area code,
of agent for service)

                                     Copies to: 
                                    JAMES L. BROCK
                                   JOHN H. SELLERS
                                       KARL SUN
                                  VENTURE LAW GROUP
                             A PROFESSIONAL CORPORATION 
                                 2800 SAND HILL ROAD
                            MENLO PARK, CALIFORNIA 94025 
                                    (415) 854-4488

          APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: 
FROM TIME TO TIME AFTER THE EFFECTIVE DATE OF THIS REGISTRATION STATEMENT 
UNTIL OCTOBER 20, 1998 OR UNTIL SUCH EARLIER TIME THAT ALL OF THE SHARES 
REGISTERED HEREUNDER HAVE BEEN SOLD.

    If the only securities being registered on this Form are to be offered 
pursuant to dividend or interest reinvestment plans, please check the 
following box. / /
     If any of the securities being registered on this Form are to be offered 
on a delayed or continuous basis pursuant to Rule 415 under the Securities 
Act of 1933, other than securities offered only in connection with dividend 
or interest reinvestment plans, check the following box. /X/
     If this Form is filed to register additional securities for an offering 
pursuant to Rule 462(b) under the Securities Act, please check the following 
box and list the Securities Act registration statement number of the earlier 
effective registration statement for the same offering.  / /
    If this Form is a post-effective amendment filed pursuant to Rule 462(c) 
under the Securities Act, check the following box and list the Securities Act 
registration statement number of the earlier effective registration statement 
for the same offering. / /
    If delivery of the prospectus is expected to be made pursuant to Rule 
434, please check the following box.  / /

                           CALCULATION OF REGISTRATION FEE
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- ----------------------------------------------------------------------------------------------------------------------------
    Title of each class of          Amount             Proposed maximum         Proposed maximum
      securities to be              to be               offering price              aggregate              Amount of 
        registered                registered             per share(1)          offering price(1)       registration fee
- ----------------------------------------------------------------------------------------------------------------------------
<S>                            <C>                     <C>                     <C>                     <C>
  Common Stock, par value
  $0.00067 per share......     1,521,834 shares              $41.25                $62,775,653               $19,023
- ----------------------------------------------------------------------------------------------------------------------------

</TABLE>
 

    
(1) Estimated solely for the purpose of computing the amount of the
registration fee, based on the average of the high and low prices for the
Company's Common Stock as reported on the Nasdaq National Market on October 30,
1997 in accordance with Rule 457 under the Securities Act of 1933.

    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SECTION 8(a), MAY
DETERMINE.

<PAGE>

NOTE:  INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT.  A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION.  THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE.  THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.

PROSPECTUS    SUBJECT TO COMPLETION, DATED NOVEMBER 5, 1997

                                   1,521,834 SHARES
                                     YAHOO! INC.
                           COMMON STOCK, $0.00067 PAR VALUE
                          ----------------------------------
      THE COMMON STOCK OFFERED HEREBY INVOLVES A HIGH DEGREE OF RISK.  SEE "RISK
FACTORS" COMMENCING ON PAGE 5 OF THIS PROSPECTUS FOR INFORMATION THAT SHOULD BE
CONSIDERED BY PROSPECTIVE INVESTORS.
                                ---------------------

    All references herein to "Yahoo!" or the "Company" mean Yahoo! Inc., a
California corporation, unless otherwise indicated by the context.

    The 1,521,834 shares of Yahoo! Inc. Common Stock, $0.00067 par value, 
covered by this Prospectus (the "Shares") are offered for the account of 
certain shareholders and warrantholders of the Company (the "Selling 
Shareholders"). The Shares were issued or reserved for issuance to the 
Selling Shareholders in connection with the acquisition by the Company of 
Four11 Corporation on October 20, 1997 (the "Acquisition").  For additional 
information regarding the Acquisition, see "Issuance of Common Stock to 
Selling Shareholders."  The Shares may be offered by the Selling Shareholders 
from time to time in one or more transactions in the over-the-counter market 
at prices prevailing therein, in negotiated transactions at such prices as 
may be agreed upon, or in a combination of such methods of sale. See "Plan of 
Distribution." The price at which any of the Shares may be sold, and the 
commissions, if any, paid in connection with any such sale, are unknown and 
may vary from transaction to transaction.  Each Selling Shareholder has 
advised the Company that no sale or distribution other than as disclosed 
herein will be effected until after this Prospectus shall have been 
appropriately amended or supplemented, if required, to set forth the terms 
thereof.  The Company will not receive any proceeds from the sale of the 
Shares by the Selling Shareholders.

    The Securities and Exchange Commission (the "Commission") may take the 
view that, under certain circumstances, the Selling Shareholders and any 
broker-dealers or agents that participate with the Selling Shareholders in 
the distribution of the Shares may be deemed to be "underwriters" within the 
meaning of the Securities Act. Commissions, discounts or concessions received 
by any such broker-dealer or agent may be deemed to be underwriting 
commissions under the Securities Act. The Company and the Selling 
Shareholders have agreed to certain indemnification arrangements. See "Plan 
of Distribution."

    The Company's Common Stock is quoted on the Nasdaq National Market under
the symbol "YHOO."  On November 4, 1997, the last sale price of the Company's
Common Stock on the Nasdaq National Market was $51 per share.
                        -------------------------------------
            THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
              SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
                COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMIS-
                 SION OR ANY STATE SECURITIES COMMISSION PASSED UPON
                     THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS.
                       ANY REPRESENTATION TO THE CONTRARY IS A
                                  CRIMINAL OFFENSE.
                               -----------------------

<TABLE>
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- ---------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------
                                                      UNDERWRITING                 PROCEEDS TO
                           Price to Public      DISCOUNTS AND COMMISSION       SELLING SHAREHOLDERS
- ---------------------------------------------------------------------------------------------------
<S>                        <C>                  <C>                            <C>    
Per Share................
Total....................   See Text Above          See Text Above                  See Text Above
- ---------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------


</TABLE>
 

                    THE DATE OF THIS PROSPECTUS IS OCTOBER -, 1997

<PAGE>

    No person is authorized in connection with any offering made hereby to give
any information or to make any representation not contained in this Prospectus,
and, if given or made, such information or representation must not be relied
upon as having been authorized by the Company or the Selling Shareholders.  This
Prospectus does not constitute an offer to sell or a solicitation of an offer to
buy any security other than the shares of Common Stock offered hereby, nor does
it constitute an offer to sell or a solicitation of an offer to buy any of the
shares offered hereby to any person in any jurisdiction in which it is unlawful
to make such an offer or solicitation.  Neither the delivery of this Prospectus
nor any sale made hereunder shall under any circumstances create any implication
that the information contained herein is correct as of any time subsequent to
the date hereof.

                                ADDITIONAL INFORMATION

    This Prospectus constitutes a part of a Registration Statement on Form S-3
(herein, together with all amendments and exhibits, referred to as the
"Registration Statement") filed by the Company with the Securities and Exchange
Commission (the "Commission") under the Securities Act.  This Prospectus does
not contain all of the information set forth in the Registration Statement,
certain parts of which are omitted in accordance with the rules and regulations
of the Commission.  For further information with respect to the Company and the
shares of Common Stock offered hereby, reference is hereby made to the
Registration Statement.  Statements contained herein concerning the provisions
of any document are not necessarily complete, and each such statement is
qualified in its entirety by reference to the copy of such document filed with
the Commission.

                                AVAILABLE INFORMATION

    The Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance
therewith files reports, proxy and information statements and other information
with the Commission.  Such reports, proxy and information statements and other
information may be inspected and copied at the public reference facilities
maintained by the Commission at 450 Fifth Street, NW, Washington, D.C. 20549,
and at the following Regional Offices of the Commission: New York Regional
Office, Seven World Trade Center, New York, New York 10048, and Chicago Regional
Office, Northwest Atrium Center, 500 West Madison Street, Chicago, Illinois
60661.  Copies of such material can be obtained from the Public Reference
Section of the Commission, 450 Fifth Street, NW, Washington, D.C. 20549 upon
payment of the prescribed fees.  The Company is also required to file electronic
versions of these documents with the Commission through the Commission's
Electronic Data Gathering, Analysis and Retrieval System ("EDGAR").  The Common
Stock of the Company is quoted on The Nasdaq National Market.  Reports, proxy
and information statements and other information concerning the Company may be
inspected at The Nasdaq Stock Market at 1735 K Street, NW, Washington, D.C.
20006. In addition, the Commission maintains a World Wide Web site
(http://www.sec.gov) that contains reports, proxy and information statements and
other information regarding registrants that file electronically with the
Commission.


                                          2
<PAGE>

                         INFORMATION INCORPORATED BY REFERENCE

         The following documents filed by the Company with the Commission are
incorporated by reference in this Prospectus:

    1.   The Company's Annual Report on Form 10-K for the year ended December
31, 1996 (File No. 0-26822).

    2.   The Company's definitive Proxy Statement dated March 25, 1997, filed
in connection with the Company's April 30, 1997 Annual Meeting of Shareholders.

    3.   The Company's Quarterly Reports on Form 10-Q for the quarters ended 
March 31, 1997, June 30, 1997, and September 30, 1997 (File No. 0-26822).

    4.   The Company's Current Reports on Form 8-K, filed with the Commission 
on August 4, 1997, October 14, 1997 (as amended October 30, 1997) (File No. 
0-26822).

    5.   The description of the Company's Common Stock set forth in the
Company's Registration Statement on Form 8-A, filed with the Commission on March
12, 1996 (File No. 0-026822).

    All documents filed by the Company pursuant to Sections 13(a), 13(c), 14 or
15(d) of the Exchange Act after the date of this Prospectus and prior to the
termination of the offering of the Common Stock offered hereby shall be deemed
to be incorporated by reference in this Prospectus.  Any statement contained in
a document incorporated by reference herein shall be deemed to be modified or
superseded for purposes hereof to the extent that a statement contained herein
(or in any other subsequently filed document which also is incorporated by
reference herein) modifies or supersedes such statement.  Any such statement so
modified or superseded shall not be deemed to constitute a part hereof, except
as so modified or superseded. 

    The Company will furnish without charge to each person, including any
beneficial owner, to whom this Prospectus is delivered, on the written or oral
request of such person, a copy of any or all of the documents incorporated by
reference, other than exhibits to such documents.  Requests should be directed
to Andrea Klipfel, Investor Relations, 3400 Central Expressway, Suite 201, Santa
Clara, California 95051, telephone:  (408) 731-3300.

                                          3

<PAGE>

                                     THE COMPANY

    Yahoo! is an Internet media company that offers a network of
globally-branded properties, specialty programming, and aggregated content
distributed primarily on the World Wide Web (the "Web") serving business
professionals and consumers, and is among the most widely used 
guides for information and discovery on the Web.

    Under the "Yahoo!" brand, the Company provides intuitive, context-based
guides to online content, Web search capabilities, aggregated third-party
content and community and personalization features.  In September 1997, Internet
users viewed an average of 50 million Web pages per day in "Yahoo!" branded
properties.

    The Company makes its properties available without charge to users and
generates revenue primarily through the sale of banner advertising.  Advertising
on Yahoo! properties is sold through the Company's internal advertising sales
force and third party agents.  During the third quarter of 1997, more than 1200
advertisers purchased advertising on Yahoo! properties.

    Yahoo! was incorporated on March 5, 1995 under the laws of California.  The
Company's principal executive offices are located at 3400 Central Expressway,
Suite 201, Santa Clara, California 95051 and its telephone number is (408)
731-3300.  As used in this prospectus, the "Company" and "Yahoo!" refer to
Yahoo! Inc., a California corporation, and its wholly owned subsidiaries.

                                          4
<PAGE>

                                     RISK FACTORS

    THIS PROSPECTUS (INCLUDING THE DOCUMENTS INCORPORATED BY REFERENCE HEREIN)
CONTAINS FORWARD-LOOKING STATEMENTS WITHIN THE MEANING OF SECTION 27A OF THE
SECURITIES ACT OF 1933 AND SECTION 21E OF THE SECURITIES EXCHANGE ACT OF 1934,
INCLUDING, WITHOUT LIMITATION, STATEMENTS REGARDING THE COMPANY'S EXPECTATIONS,
BELIEFS, INTENTIONS OR FUTURE STRATEGIES. ALL FORWARD LOOKING STATEMENTS
INCLUDED IN THIS DOCUMENT ARE BASED ON INFORMATION AVAILABLE TO THE COMPANY ON
THE DATE HEREOF, AND THE COMPANY ASSUMES NO OBLIGATION TO UPDATE ANY SUCH
FORWARD LOOKING STATEMENTS. ACTUAL RESULTS COULD DIFFER MATERIALLY FROM THOSE
PROJECTED IN THE FORWARD-LOOKING STATEMENTS AS A RESULT OF THE RISK FACTORS SET
FORTH BELOW AND IN THE DOCUMENTS INCORPORATED BY REFERENCE HEREIN. IN EVALUATING
THE COMPANY'S BUSINESS, PROSPECTIVE INVESTORS SHOULD CAREFULLY CONSIDER THE
FOLLOWING RISK FACTORS IN ADDITION TO THE OTHER INFORMATION SET FORTH HEREIN OR
INCORPORATED HEREIN BY REFERENCE.

LIMITED OPERATING HISTORY; ANTICIPATED LOSSES

    The Company was incorporated in March 1995 and did not commence 
generating advertising revenues until August 1995. Accordingly, the Company 
has a limited operating history upon which an evaluation of the Company can 
be based, and its prospects are subject to the risks, expenses and 
uncertainties frequently encountered by companies in the new and rapidly 
evolving markets for Internet products and services, including the Web-based 
advertising market. Specifically, such risks include, without limitation, the 
failure to continue to develop and extend the "Yahoo!" brand, the failure to 
develop new media properties, the inability of the Company to maintain and 
increase the levels of traffic on Yahoo! properties, the development of equal 
or superior services or products by competitors, the failure of the market to 
adopt the Web as an advertising medium, the failure to successfully sell 
Web-based advertising through the Company's recently developed internal sales 
force, potential reductions in market prices for Web-based advertising as a 
result of competition or other factors, the failure of the Company to 
effectively generate commerce-related revenues through sponsored services and 
placements in Yahoo! properties, the inability of the Company to effectively 
integrate the technology and operations or any other acquired businesses or 
technologies with its operations such as the recent acquisition of Four11, 
the failure of the Company to successfully offer personalized Web-based 
services, such as e-mail services, to consumers without errors or 
interruptions in service, and the inability to continue to identify, attract, 
retain and motivate qualified personnel. There can be no assurance that the 
Company will be successful in addressing such risks. As of September 30, 
1997, the Company had an accumulated deficit of $26,695,000. The limited 
operating history of the Company and the uncertain nature of the markets 
addressed by the Company make the prediction of future results of operations 
difficult or impossible and, therefore, the recent revenue growth experienced 
by the Company should not be taken as indicative of the rate of revenue 
growth, if any, that can be expected in the future. The Company believes that 
period to period comparisons of its operating results are not meaningful and 
that the results for any period should not be relied upon as an indication of 
future performance. The Company currently expects to significantly increase 
its operating expenses to expand its sales and marketing operations, to fund 
greater levels of product development and to develop and commercialize 
additional media properties. As a result of these factors, there can be no 
assurance that the Company will not incur significant losses on a quarterly 
and annual basis.

FLUCTUATIONS IN QUARTERLY OPERATING RESULTS

    As a result of the Company's limited operating history, the Company does
not have historical financial data for a significant number of periods on which
to base planned operating expenses. The Company derives the majority of its
revenues from the sale of advertisements under short-term contracts, which are
difficult to forecast accurately.  The Company's expense levels are based in
part on its expectations concerning future revenue and to a

                                          5
<PAGE>

large extent are fixed.  The Company also has fixed expenses in the form of 
advertising revenue guarantees of up to $18.5 million over the next 18 months 
relating to the NETSCAPE GUIDE BY YAHOO!, which subject the Company to 
additional risk in the event that revenues from this property are not 
sufficient to offset guaranteed payments and related operating expenses.  
Quarterly revenues and operating results depend substantially upon the 
advertising revenues received within the quarter, which are difficult to 
forecast accurately. Accordingly, the cancellation or deferral of a small 
number of advertising contracts could have a material adverse effect on the 
Company's business, results of operations and financial condition.  The 
Company may be unable to adjust spending in a timely manner to compensate for 
any unexpected revenue shortfall, and any significant shortfall in revenue in 
relation to the Company's expectations would have an immediate adverse effect 
on the Company's business, operating results and financial condition.  In 
addition, the Company plans to continue to significantly increase its 
operating expenses to expand its sales and marketing operations, to continue 
to develop and extend the "Yahoo!" brand, to fund greater levels of product 
development and to develop and commercialize additional media properties.  To 
the extent that such expenses precede or are not subsequently followed by 
increased revenues, the Company's business, operating results and financial 
condition will be materially and adversely affected.

    The Company's operating results may fluctuate significantly in the future 
as a result of a variety of factors, many of which are outside the Company's 
control. These factors include the level of usage of the Internet, demand for 
Internet advertising, the addition or loss of advertisers, the level of user 
traffic on YAHOO! and the Company's other online media properties, the 
advertising budgeting cycles of individual advertisers, the amount and timing 
of capital expenditures and other costs relating to the expansion of the 
Company's operations, the introduction of new products or services by the 
Company or its competitors, pricing changes for Web-based advertising, the 
timing of initial set-up, engineering or development fees that may be paid in 
connection with larger advertising and distribution arrangements, technical 
difficulties with respect to the use of YAHOO! or other media properties 
developed by the Company, incurrence of costs relating to acquisitions such 
as the recent acquisition of Four11 Corporation, general economic conditions 
and economic conditions specific to the Internet and online media. As a 
strategic response to changes in the competitive environment, the Company may 
from time to time make certain pricing, service or marketing decisions or 
business combinations that could have a material adverse effect on the 
Company's business, results of operations and financial condition. The 
Company also has experienced, and expects to continue to experience, 
seasonality in its business, with user traffic on YAHOO! and the Company's 
other online media properties being lower during the summer and year-end 
vacation and holiday periods, when usage of the Web and the Company's 
services typically experience slower growth or decline. Additionally, 
seasonality may also affect the amount of customer advertising dollars placed 
with the Company in the first and third calendar quarters as advertisers 
historically spend less during these quarters.  

    A key element of the Company's strategy is to generate additional 
advertising revenues through sponsored services and placements by third 
parties in Yahoo! online properties in addition to banner advertising.  In 
connection with these arrangements, the Company may receive sponsorship fees 
as well as a portion of transaction revenues received by the third party 
sponsor from users originated through the Yahoo! placement, in return for 
minimum levels of user impressions to be provided by the Company.  To the 
extent implemented, these arrangements expose the Company to potentially 
significant financial risks, including the risk that the Company fails to 
deliver required minimum levels of user impressions and that third party 
sponsors do not renew the agreements at the end of their term.  In addition, 
because the Company has limited experience with these arrangements, the 
Company is unable to determine what effect such arrangements will have on 
gross margins and results of operations.  Although transaction-based fees 
have not to date represented a material portion of the Company's net 
revenues, if and to the extent such revenues become significant, the 
foregoing factors could result in greater variations in the Company's 
quarterly operating results and could have a material adverse effect on the 
Company's business, results of operations and financial condition.

    Due to all of the foregoing factors, in some future quarter the Company's
operating results may fall below the expectations of securities analysts and
investors. In such event, the trading price of the Company's Common Stock would
likely be materially and adversely affected. 

                                          6
<PAGE>

RISKS ASSOCIATED WITH NETSCAPE GUIDE BY YAHOO!

    During March 1997, the Company entered into certain agreements with 
Netscape Communications Corporation ("Netscape") under which the Company has
developed and operates an Internet information navigation service called 
"NETSCAPE GUIDE BY YAHOO!" (the "GUIDE"). The Co-Marketing agreement provides 
that revenue from advertising on the GUIDE, which is managed by the Company, 
is to be shared between the Company and Netscape. Under the terms of the 
Trademark License agreement, the Company made a one-time non-refundable 
trademark license fee payment of $5,000,000 in March 1997 which is being 
amortized over the initial two-year term, which commenced in May 1997. Under 
the terms of the Co-Marketing agreement as amended in June 1997, the Company 
also provided Netscape with a minimum of $4,660,000 in guarantees against 
shared advertising revenues in the first year of the agreement and up to 
$15,000,000 in the second year of the agreement, subject in the second year 
to certain minimum levels of advertising impressions being reached on the 
GUIDE. Actual payments may be higher and will relate directly to the overall 
revenue recognized from the GUIDE.

    The Netscape Guide agreement exposes the Company to a number of 
significant risks and uncertainties, including, without limitation: the risk 
that the Company will fail to generate sufficient advertising revenue to 
offset the initial and future guaranteed payments to Netscape, including any 
failure that results from negative trends in the Web-based advertising 
business (such as price erosion) or the inability of the Company to rapidly 
expand their advertising sales and management efforts to match the additional 
inventory currently anticipated from the Guide; the risk that projected user 
traffic levels for the Guide will not be achieved, which may be affected by 
several factors, such as declines or slower growth in the number of users of 
Netscape's browser product, particularly as a result of continued increases 
in the market share of other browser products, such as Microsoft 
Corporation's ("Microsoft") Internet Explorer browser product; the effect of 
competitive personalized information services from other parties; and the 
risk that Netscape does not elect to renew the agreement at the end of the 
two year term, after which the agreement permits Netscape to use certain 
elements of the user interface developed by the Company without payment of 
any consideration to the Company. As a result of the foregoing factors, there 
can be no assurance that the Guide activities will not have a material 
adverse effect on the Company's business, operating results or financial 
condition.

COMPETITION

    The market for Internet products and services is highly competitive and 
competition is expected to continue to increase significantly. There are no 
substantial barriers to entry in these markets, and the Company expects that 
competition will continue to intensify. Although the Company currently 
believes that the diverse segments of the Internet market will provide 
opportunities for more than one supplier of products and services similar to 
those of the Company, it is possible that a single supplier may dominate one 
or more market segments.

    The Company competes with many other providers of online navigation,
information and community services. Many companies offer competitive products or
services addressing Web navigation services, including, among others, Digital
Equipment Corporation (AltaVista), Excite, Inc. ("Excite"), including WebCrawler
and NetFind, the version of Excite's service for America Online ("AOL") users,
Infoseek Corporation, Inktomi, Lycos, Inc. (Lycos and A2Z), Open Text
Corporation (Open Text Index), C|NET (Snap! Online) and Wired (hotbot). In
addition, the Company competes with metasearch services and software
applications, such as C|NET's search.com 

                                          7
<PAGE>

service, that allow a user to search the databases of several directories and 
catalogs simultaneously. The Company also competes indirectly with database 
vendors that offer information search and retrieval capabilities with their 
core database products. The Company also faces competition from providers of 
software and other Internet products and services that incorporate search and 
retrieval features into their offerings. For example, Web browsers offered by 
Netscape and Microsoft, which are the most widely used browsers, incorporate 
prominent search buttons and similar features, such as features based on 
"push" technologies, that direct search traffic to competing services, 
including those that may be developed or licensed by such parties. In 
addition, entities that sponsor or maintain high-traffic Web sites or that 
provide an initial point of entry for Internet users, such as the Regional 
Bell Operating Companies or Internet Service Providers ("ISPs") such as 
Microsoft and AOL, currently offer and could further develop, acquire or 
license Internet search and navigation functions that compete with those 
offered by the Company and could take actions that make it more difficult for 
consumers to find and use Yahoo! services. For example, Microsoft recently 
announced that it will offer Internet search engine services provided by 
Inktomi in the Microsoft Network and other Microsoft online properties.  The 
Company expects that such search services may be tightly integrated into the 
Microsoft operating system, the Internet Explorer browser and other software 
applications, and that Microsoft may promote such services within the 
Microsoft Network or through other end-user services such as WebTV. Insofar 
as Microsoft's Internet navigational offerings may be more conveniently 
accessed by users than those of the Company, this may provide Microsoft with 
significant competitive advantages that could have a material adverse effect 
on the Company's business.  A large number of Web sites and online services 
(including, among others, the Microsoft Network, AOL, and other Web 
navigation companies such as Excite, Lycos and Infoseek) offer informational 
and community features, such as news, stock quotes, sports coverage, Yellow 
Pages and e-mail listings, weather news, chat services and bulletin board 
listings that are competitive with the services offered by the Company.  A 
number of companies, including HotMail and WhoWhere?, offer Web-based e-mail 
service similar to those offered by the Company, and such companies have and 
are expected to continue to provide such services in tandem with larger 
navigational sites and online services.  Several companies, including large 
companies such as Microsoft and AOL and their affiliates, also are developing 
or currently offer online information services for local markets, which 
compete with the Company's regional Yahoo! online properties. The Company 
also faces intense competition in international markets, including 
competition from U.S.-based competitors as well as media and online companies 
that are already well established in those foreign markets. Many of the 
Company's existing competitors, as well as a number of potential new 
competitors, have significantly greater financial, technical, marketing and 
distribution resources than the Company. In addition, providers of Internet 
tools and services may be acquired by, receive investments from or enter into 
other commercial relationships with larger, well-established and 
well-financed companies, such as Microsoft or Netscape. For example, AOL is a 
significant shareholder of Excite, and a version of the Excite service (AOL 
NetFind) has been designated as the exclusive Internet search service for use 
by AOL's subscribers. Greater competition resulting from such relationships 
could have a material adverse effect on the Company's business, operating 
results and financial condition.

    The Company also competes with online services, other Web site operators 
and advertising networks, as well as traditional offline media such as 
television, radio and print for a share of advertisers' total advertising 
budgets. The Company believes that the number of companies selling Web-based 
advertising and the available inventory of advertising space have increased 
substantially during recent periods. Accordingly, the Company may face 
increased pricing pressure for the sale of advertisements and reductions in 
the Company's advertising revenues.

                                          8
<PAGE>

    The Company believes that the principal competitive factors in its 
markets are brand recognition, ease of use, comprehensiveness, independence, 
quality and responsiveness of search results, the availability of targeted 
content and focused value added products and services, quality and brand 
appeal, access to end users, and, with respect to advertisers and sponsors, 
the number of users, duration and frequency of visits and user demographics. 
Competition among current and future suppliers of Internet navigational and 
informational services, high-traffic Web sites and ISPs, as well as 
competition with other media for advertising placements, could result in 
significant price competition and reductions in advertising revenues. There 
can be no assurance that the Company will be able to compete successfully or 
that the competitive pressures faced by the Company will not have a material 
adverse effect on the Company's business, operating results and financial 
condition.

DEPENDENCE ON CONTINUED GROWTH IN USE OF THE INTERNET; TECHNOLOGICAL CHANGE

    The Company's future success is substantially dependent upon continued 
growth in the use of the Internet and the Web in order to support the sale of 
advertising on the Company's online media properties. There can be no 
assurance that communication or commerce over the Internet will become more 
widespread or that extensive content will continue to be provided over the 
Internet. The Internet may not prove to be a viable commercial marketplace 
for a number of reasons, including lack of acceptable security technologies, 
potentially inadequate development of the necessary infrastructure, such as a 
reliable network backbone, or timely development and commercialization of 
performance improvements, including high speed modems. In addition, to the 
extent that the Internet continues to experience significant growth in the 
number of users and level of use, there can be no assurance that the Internet 
infrastructure will continue to be able to support the demands placed upon it 
by such potential growth or that the performance or reliability of the Web 
will not be adversely affected by this continued growth. If use of the 
Internet does not continue to grow, or if the Internet infrastructure does 
not effectively support growth that may occur, the Company's business, 
operating results and financial condition would be materially and adversely 
affected. The market for Internet products and services is characterized by 
rapid technological developments, evolving industry standards and customer 
demands, and frequent new product introductions and enhancements. These 
market characteristics are exacerbated by the emerging nature of this market 
and the fact that many companies are expected to introduce new Internet 
products and services in the near future. Failure of the Company to 
effectively adapt to technological developments could adversely affect the 
Company's business, operating results and financial condition.

DEVELOPING MARKET; UNPROVEN ACCEPTANCE OF THE COMPANY'S PRODUCTS AND MEDIA
PROPERTIES

    The markets for the Company's products and media properties have only 
recently begun to develop, are rapidly evolving and are characterized by an 
increasing number of market entrants who have introduced or developed 
information navigation products and services for use on the Internet and the 
Web. As is typical in the case of a new and rapidly evolving industry, demand 
and market acceptance for recently introduced products and services are 
subject to a high level of uncertainty and risk. Because the market for the 
Company's products and media properties is new and evolving, it is difficult 
to predict the future growth rate, if any, and size of this market. There can 
be no assurance either that the market for the Company's products and media 
properties will develop or that demand for the Company's products or media 
properties will emerge or become sustainable. If the market fails to develop, 
develops more slowly than expected or becomes saturated with competitors, or 
if the Company's products and media properties do not achieve or sustain 
market acceptance, the Company's business, operating results and financial 
condition will be materially and adversely affected.

RISKS ASSOCIATED WITH BRAND DEVELOPMENT

    The Company believes that establishing and maintaining the "Yahoo!" brand
is a critical aspect of its efforts to attract and expand its audience and that
the importance of brand recognition will increase due to the 


                                          9
<PAGE>

growing number of Internet sites and the relatively low barriers to entry. 
Promotion and enhancement of the "Yahoo!" brand will depend largely on the 
Company's success in providing high quality products and services, which 
cannot be assured. In order to attract and retain Internet users and to 
promote and maintain the "Yahoo!" brand in response to competitive pressures, 
the Company may find it necessary to increase substantially its financial 
commitment to creating and maintaining a distinct brand loyalty among 
consumers. If the Company is unable to provide high quality products and 
services or otherwise fails to promote and maintain its brand, or if the 
Company incurs excessive expenses in an attempt to improve its products and 
services or promote and maintain its brand, the Company's business, operating 
results and financial condition will be materially and adversely affected.

RELIANCE ON ADVERTISING REVENUES AND UNCERTAIN ADOPTION OF THE WEB AS AN
ADVERTISING MEDIUM

    The Company derives substantially all of its revenues from the sale of 
advertisements on its Web pages under short-term contracts. Most of the 
Company's advertising customers have only limited experience with the Web as 
an advertising medium, have not devoted a significant portion of their 
advertising expenditures to Web-based advertising and may not find such 
advertising to be effective for promoting their products and services 
relative to traditional print and broadcast media. The Company's ability to 
generate significant advertising revenues will depend upon, among other 
things, advertisers' acceptance of the Web as an effective and sustainable 
advertising medium, the development of a large base of users of the Company's 
services possessing demographic characteristics attractive to advertisers, 
and the ability of the Company to continue to develop and update effective 
advertising delivery and measurement systems. No standards have yet been 
widely accepted for the measurement of the effectiveness of Web-based 
advertising, and there can be no assurance that such standards will develop 
sufficiently to support Web-based advertising as a significant advertising 
medium. In addition, there can be no assurance that the advertisers will 
determine that banner advertising, which comprises substantially all of the 
Company's revenues, is an effective advertising medium, and there can be no 
assurance that the Company will effectively transition to any other forms of 
Web-based advertising, should they develop. Certain advertising filter 
software programs are available that limit or remove advertising from an 
Internet user's desktop. Such software, if generally adopted by users, may 
have a materially adverse effect upon the viability of advertising on the 
Internet. There also can be no assurance that the Company's advertising 
customers will accept the internal and third-party measurements of 
impressions received by advertisements on Yahoo! and the Company's online 
media properties, or that such measurements will not contain errors. The 
Company relies primarily on its internal advertising sales force for domestic 
advertising sales, which involves additional risks and uncertainties, 
including (among others) risks associated with the recruitment, retention, 
management, training and motivation of sales personnel. As a result of these 
factors, there can be no assurance that the Company will sustain or increase 
current advertising sales levels. Failure to do so will have a material 
adverse effect on the Company's business, operating results and financial 
position.

SUBSTANTIAL DEPENDENCE UPON THIRD PARTIES

    The Company depends substantially upon third parties for several critical 
elements of its business including, among others, technology and 
infrastructure, content development and distribution activities.

                                          10
<PAGE>

    TECHNOLOGY AND INFRASTRUCTURE.  The Company supplements its Internet 
directory listings with full-text Web search results provided by AltaVista, a 
division of Digital Equipment Corporation ("Digital"), under a non-exclusive 
agreement. The Company believes that these search results provide a key 
competitive element for its Internet navigation services. The Company 
therefore depends substantially upon ongoing maintenance and technical 
support from Digital to ensure accurate and rapid presentation of such search 
results to the Company's customers. In addition, any termination of the 
agreement with Digital or Digital's failure to renew such agreement upon 
expiration could result in substantial additional costs to the Company in 
developing or licensing replacement technology, and could result in a loss of 
levels of use of the Company's navigational services. The Company also relies 
on a private third party provider, GlobalCenter, Inc. ("GlobalCenter"), for 
the Company's Internet connections. Any disruption in the Internet access 
provided by GlobalCenter or any failure of GlobalCenter to handle current or 
higher volumes of use could have a material adverse effect on the Company's 
business, operating results and financial condition. The Company also 
licenses technology and related databases from third parties for certain 
elements of Yahoo! properties, including, among others, technology underlying 
news, stock quotes and current financial information, chat services, street 
mapping, telephone listings and similar services. The Company has experienced 
and expects to continue to experience interruptions and delays in service and 
availability for such elements, such as recent interruptions in the Company's 
stock quote services. Any errors, failures or delays experienced in 
connection with these third party technologies and information services could 
negatively impact the Company's relationship with users and adversely affect 
the Company's brand and its business, and could expose the Company to 
liabilities to third parties.

    CONTENT DEVELOPMENT.  A key element of the Company's strategy involves 
the implementation of Yahoo!-branded media properties targeted for interest 
areas, demographic groups and geographic areas. In these efforts, the Company 
has relied and will continue to rely substantially on content development and 
localization efforts of third parties. For example, the Company has entered 
into an agreement with Ziff-Davis pursuant to which Ziff-Davis publishes an 
online publication and a print magazine under the "Yahoo!" brand. The Company 
also expects to rely substantially on third party affiliates, including 
SOFTBANK in Japan and Korea, Rogers Communications ("Rogers") in Canada, and 
Ziff-Davis in certain European countries, to localize, maintain and promote 
these services and to sell advertising in local markets. There can be no 
assurance that the Company's current or future third-party affiliates will 
effectively implement these properties, or that their efforts will result in 
significant revenue to the Company. Any failure of these parties to develop 
and maintain high-quality and successful media properties also could result 
in unfavorable dilution to the "Yahoo!" brand.

    DISTRIBUTION RELATIONSHIPS.  In order to create traffic for the Company's 
online properties and make them more attractive to advertisers and consumers, 
the Company has entered into certain distribution agreements and informal 
relationships with leading Web browser providers (Microsoft and Netscape), 
operators of online networks and leading Web sites, and computer 
manufacturers, such as Compaq Computer and Gateway 2000.  The Company 
believes these arrangements are important to the promotion of the Company's 
online media properties particularly among new Web users who may first access 
the Web through these browsers, services, Web sites or computers. The 
Company's business relationships with these companies consist of arrangements 
for the positioning of access to Yahoo! properties on Web browsers and 
cooperative marketing programs and licenses to include YAHOO! in online 
networks or services offered by these parties, which are intended to increase 
the use and visibility of YAHOO!. These distribution arrangements typically 
are not exclusive, and may be terminable upon little or no notice. Third 
parties that provide distribution channels for the Company may also assess 
fees or otherwise impose additional conditions on the listing of YAHOO! or 
other online properties of the Company, such as Netscape's requirement of 
substantial payments for placement of YAHOO! on the "Net Search" Web page 
accessible from a button on the 

                                          11
<PAGE>

Netscape Web browser. In addition, these companies may terminate or reduce 
their joint marketing activities with the Company. Any such events could have 
a material adverse effect on the Company's business, results of operations 
and financial condition.

ENHANCEMENT OF YAHOO! PROPERTIES AND DEVELOPMENT OF NEW PROPERTIES

    To remain competitive, the Company must continue to enhance and improve 
the functionality, features and content of the YAHOO! main site, as well as 
the Company's other branded media properties, such as the NETSCAPE GUIDE BY 
YAHOO!. There can be no assurance that the Company will be able to 
successfully maintain competitive user response times or implement new 
features and functions, such as new search capabilities, greater levels of 
user personalization, localized content filter and information delivery 
through "push" or other methods, which will involve the development of 
increasingly complex technologies.  The Company also expects that 
personalized information services, such as the Company's recently launched 
Web-based e-mail service, will require significantly greater expenses 
associated with, among other things, increased server capacity and equipment 
and requirements for additional customer support personnel and systems.  To 
the extent such additional expenses are not offset by additional revenues 
from such personalized services, the Company's financial results will be 
adversely affected.

    The Company's future success also depends in part upon the timely 
processing of Web site listings submitted by users and Web content providers, 
which have increased substantially in recent periods. The Company has from 
time to time experienced significant delays in the processing of submissions, 
and further delays could have a material adverse effect on the Company's 
goodwill among Web users and content providers, and on the Company's business.

    A key element of the Company's business strategy is the development and 
introduction of new YAHOO! online properties targeted for specific interest 
areas, user groups with particular demographic characteristics and geographic 
areas. There can be no assurance that the Company will be successful in 
developing, introducing and marketing such products or media properties or 
that such products and media properties will achieve market acceptance, 
enhance the Company's brand name recognition or increase traffic on Yahoo!'s 
online properties. Furthermore, enhancements of or improvements to YAHOO! or 
new media properties may contain undetected errors that require significant 
design modifications, resulting in a loss of customer confidence and user 
support and a decrease in the value of the Company's brand name recognition. 
The Company's ability to successfully develop additional targeted media 
properties depends substantially on use of YAHOO! to promote such properties. 
If use of YAHOO! fails to continue to grow, the Company's ability to 
establish other targeted properties would be adversely affected. Any failure 
of the Company to effectively develop and introduce these properties, or 
failure of such properties to achieve market acceptance, could adversely 
affect the Company's business, results of operations and financial condition.

INVESTMENTS IN AFFILIATES

    The Company has made equity investments in affiliated companies that are
involved in the commercialization of "Yahoo!" branded online properties, such as
versions of YAHOO! localized for foreign markets.  The Company currently intends
to continue to make significant additional investments in such companies 

                                          12
<PAGE>

from time to time in the future, as well as other companies involved in the 
development of technologies or services that are complementary or related to 
the Company's business. These affiliated companies typically are in an early 
stage of development and may be expected to incur substantial losses. As a 
result, the Company has recorded and expects to continue to record a share of 
the losses in such affiliates attributable to the Company's ownership, which 
losses have had and will continue to have an adverse effect on the Company's 
results of operations. Furthermore, there can be no assurance that any 
investments in such companies will result in any return nor can there be any 
assurance as to the timing of any such return, or that the Company will not 
lose its entire investment.

MANAGEMENT OF POTENTIAL GROWTH

    The Company's recent growth has placed, and is expected to continue to 
place, a significant strain on its managerial, operational and financial 
resources. To manage its potential growth, the Company must continue to 
implement and improve its operational and financial systems and to expand, 
train and manage its employee base. The Company also expects that its 
operational and management systems will face additional strain as a result of 
the Company's recent acquisition of Four11 Corporation.  The process of 
managing advertising within large, high traffic Web sites such as those in 
the YAHOO! network is an increasingly important and complex task.  The 
Company relies on both internal and licensed third party advertising 
inventory management and analysis systems. To the extent that any extended 
failure of the Company's advertising management system results in incorrect 
advertising insertions, the Company may be exposed to "make good" obligations 
with its advertising customers, which, by displacing advertising inventory, 
could defer advertising revenues and thereby have a material adverse effect 
on the Company's business, operating results and financial condition.  
Failure of the Company's advertising management systems to effectively track 
and provide accurate and timely reports on advertising results also could 
negatively effect the Company's relationships with advertisers and thereby 
have an adverse effect on the Company's business.  There can be no assurance 
that the Company's systems, procedures or controls will be adequate to 
support the Company's operations or that Company management will be able to 
achieve the rapid execution necessary to fully exploit the Company's market 
opportunity.  Any inability to effectively manage growth, if any, could have 
a material adverse effect on the Company's business, operating results and 
financial condition. 

RISK OF CAPACITY CONSTRAINTS AND SYSTEMS FAILURES 

    The Company is dependent on its ability to effectively serve a high volume
of use of its online media properties. Accordingly, the performance of the
Company's online media properties is critical to the Company's 

                                          13
<PAGE>

reputation, its ability to attract advertisers to the Company's Web sites and 
to achieve market acceptance of these products and media properties. Any 
system failure that causes interruption or an increase in response time of 
the Company's products and media properties could result in less traffic to 
the Company's Web sites and, if sustained or repeated, could reduce the 
attractiveness of the Company's products and media properties to advertisers 
and licensees. An increase in the volume of queries conducted through the 
Company's products and media properties could strain the capacity of the 
software or hardware deployed by the Company, which could lead to slower 
response time or system failures, and adversely affect the number of 
impressions received by advertisers and thus the Company's advertising 
revenues. In addition, as the number of Web pages and users increase, there 
can be no assurance that the Company's products and media properties and 
infrastructure will be able to scale accordingly. The Company also faces 
technical challenges associated with higher levels of personalization and 
localization of content delivered to users of its services, which adds strain 
to the Company's development and operational resources.  For example, 
personalized information services, such as Web-based email services, involve 
increasingly complex technical and operational challenges, and there can be 
no assurance that the Company will successfully implement and scale such 
services to the extent required by any growth in the number of users of such 
services, or that the failure to do so will not materially and adversely 
affect the goodwill of users of these services, or negatively affect the 
Company's brand and reputation.  The Company is also dependent upon Web 
browsers and Internet and online service providers for access to its products 
and media properties. In particular, a private third party provider, 
GlobalCenter, provides the Company's principal Internet connections. In the 
past, users have occasionally experienced difficulties due to system 
failures, including failures unrelated to the Company's systems. Any 
disruption in the Internet access provided by GlobalCenter or any failure of 
GlobalCenter to handle higher volumes of user traffic could have a material 
adverse effect on the Company's business, operating results and financial 
condition. Furthermore, the Company is dependent on hardware suppliers for 
prompt delivery, installation and service of servers and other equipment used 
to deliver the Company's products and services. 

    The Company's operations are susceptible to outages due to fire, floods, 
power loss, telecommunications failures, break-ins and similar events. In 
addition, substantially all of the Company's network infrastructure is 
located in Northern California, an area susceptible to earthquakes, which 
also could cause system outages or failures.  The Company does not presently 
have a disaster recovery plan or redundant, multiple site capacity in the 
event of any such occurrence. Despite the implementation of network security 
measures by the Company, its servers are vulnerable to computer viruses, 
break-ins and similar disruptions from unauthorized tampering with the 
Company's computer systems. The occurrence of any of these events could 
result in interruptions, delays or cessations in service to Yahoo! users, 
which could have a material adverse effect on the Company's business, 
operating results and financial condition. 

INTEGRATION OF ACQUISITIONS 

    As part of its business strategy, the Company expects to enter into 
business combinations.  For example, the Company recently acquired Four11 
Corporation, a privately held online communications and directory company.  
Acquisition transactions are accompanied by a number of risks, including, 
among other things, the difficulty of assimilating the operations and 
personnel of the acquired companies, the potential disruption of the 
Company's ongoing business, the inability of management to maximize the 
financial and strategic position of the Company through the successful 
incorporation of acquired technology or content and rights into the Company's 
products and media properties, expenses associated with the transactions 
(such as expenses of approximately $4 million that the Company expects to be 
incurred in the fourth quarter of 1997 in connection with the acquisition of 
Four11 Corporation) additional expenses associated with amortization of 
acquired intangible assets, the maintenance of uniform standards, controls, 
procedures and policies, the impairment of relationships with employees and 
customers as a result of any integration of new management personnel, and the 
potential unknown liabilities associated with acquired businesses. There can 
be no assurance that the Company would be successful in overcoming these 
risks or any other problems encountered in connection with such acquisitions.

TRADEMARKS AND PROPRIETARY RIGHTS 

                                          14
<PAGE>

    The Company regards its copyrights, trademarks, trade dress, trade 
secrets and similar intellectual property as critical to its success, and the 
Company relies upon trademark and copyright law, trade secret protection and 
confidentiality and/or license agreements with its employees, customers, 
partners and others to protect its proprietary rights. The Company pursues 
the registration of its trademarks in the United States and (based upon 
anticipated use) internationally, and has applied for the registration of 
certain of its trademarks, including "Yahoo!" and "Yahooligans!". Effective 
trademark, copyright and trade secret protection may not be available in 
every country in which the Company's products and media properties are 
distributed or made available through the Internet. The Company has licensed 
in the past, and it expects that it may license in the future, elements of 
its distinctive trademarks, trade dress and similar proprietary rights to 
third parties, including in connection with branded mirror sites of YAHOO!, 
and other media properties and merchandise that may be controlled 
operationally by third parties. While the Company attempts to ensure that the 
quality of its brand is maintained by such licensees, no assurances can be 
given that such licensees will not take actions that could materially and 
adversely affect the value of the Company's proprietary rights or the 
reputation of its products and media properties, either of which could have a 
material adverse effect on the Company's business. Also, the Company is aware 
that third parties have from time to time copied significant portions of 
YAHOO! directory listings for use in competitive Internet navigational tools 
and services, and there can be no assurance that the distinctive elements of 
YAHOO! will be protectible under copyright law. There can be no assurance 
that the steps taken by the Company to protect its proprietary rights will be 
adequate or that third parties will not infringe or misappropriate the 
Company's copyrights, trademarks, trade dress and similar proprietary rights. 
In addition, there can be no assurance that other parties will not assert 
infringement claims against the Company.

    Many parties are actively developing search, indexing and related Web
technologies at the present time. The Company believes that such parties have
taken and will continue to take steps to protect these technologies, including
seeking patent protection. As a result, the Company believes that disputes
regarding the ownership of such technologies are likely to arise in the future.

DEPENDENCE ON KEY PERSONNEL

    The Company's performance is substantially dependent on the performance of
its senior management and key technical personnel. In particular, the Company's
success depends substantially on the continued efforts of its senior management
team. The Company does not carry key person life insurance on any of its senior
management personnel. The loss of the services of any of its executive officers
or other key employees could have a material adverse effect on the business,
operating results and financial condition of the Company. 

    The Company's future success also depends on its continuing ability to
attract and retain highly qualified technical and managerial personnel.
Competition for such personnel is intense and there can be no assurance that the
Company will be able to retain its key managerial and technical employees or
that it will be able to attract and retain additional highly qualified technical
and managerial personnel in the future. The inability to attract and retain the
necessary technical and managerial personnel could have a material and adverse
effect upon the Company's business, operating results and financial condition. 

GOVERNMENT REGULATION AND LEGAL UNCERTAINTIES 

    There are currently few laws or regulations directly applicable to access 
to or commerce on the Internet. Due to the increasing popularity and use of 
the Internet, it is possible that a number of laws and regulations may be 
adopted with respect to the Internet, covering issues such as 

                                          15
<PAGE>

user privacy, pricing and characteristics and quality of products and 
services. For example, although the Communications Decency Act was held to be 
unconstitutional, there can be no assurance that similar legislation will not 
be enacted in the future and it is possible that such legislation could 
expose the Company to substantial liability. Such legislation could also 
dampen the growth in use of the Web generally and decrease the acceptance of 
the Web as a communications and commercial medium, and could, thereby, have a 
material adverse effect on the Company's business, results of operations and 
financial condition. Other nations, including Germany, have taken actions to 
restrict the free flow of material deemed to be objectionable on the Web. In 
addition, several telecommunications carriers are seeking to have 
telecommunications over the Web regulated by the Federal Communications 
Commission (the "FCC") in the same manner as other telecommunications 
services. For example, America's Carriers Telecommunications Association 
("ACTA") has filed a petition with the FCC for this purpose. In addition, 
because the growing popularity and use of the Web has burdened the existing 
telecommunications infrastructure and many areas with high Web use have begun 
to experience interruptions in phone service, local telephone carriers, such 
as Pacific Bell, have petitioned the FCC to regulate ISPs and OSPs in a 
manner similar to long distance telephone carriers and to impose access fees 
on the ISPs and OSPs. If either of these petitions is granted, or the relief 
sought therein is otherwise granted, the costs of communicating on the Web 
could increase substantially, potentially slowing the growth in use of the 
Web, which could in turn decrease the demand for the Company's products and 
media properties. Also it is possible that laws will be adopted or current 
laws interpreted in a manner to impose liability on online service providers 
such as the Company for listing or linking to third party Web sites that 
include materials that infringe copyrights or other rights of others. Such 
laws and regulations if enacted could have an adverse effect on the Company's 
business, operating results and financial condition. Moreover, the 
applicability to the Internet of the existing laws governing issues such as 
property ownership, copyright defamation, obscenity and personal privacy is 
uncertain, and the Company may be subject to claims that its services violate 
such laws. Any such new legislation or regulation or the application of 
existing laws and regulations to the Internet could have a material adverse 
effect on the Company's business, operating results and financial condition.

    Due to the global nature of the Web, it is possible that, although
transmissions by the Company over the Internet originate primarily in the State
of California, the governments of other states and foreign countries might
attempt to regulate the Company's transmissions or prosecute the Company for
violations of their laws. There can be no assurance that violations of local
laws will not be alleged or charged by state or foreign governments, that the
Company might not unintentionally violate such law or that such laws will not be
modified, or new laws enacted, in the future. Any of the foregoing developments
could have a material adverse effect on the Company's business, results of
operations and financial condition.

LIABILITY FOR INFORMATION SERVICES AND COMMERCE-RELATED ACTIVITIES

    Because materials may be downloaded by the online or Internet services 
operated or facilitated by the Company and may be subsequently distributed to 
others, there is a potential that claims will be made against the Company for 
defamation, negligence, copyright or trademark infringement, personal injury 
or other theories based on the nature and content of such materials. Such 
claims have been brought, and sometimes successfully pressed, against online 
service providers in the past. In addition, the Company could be exposed to 
liability with respect to the selection of listings that may be accessible 
through the Company's Yahoo!-branded products and media properties, or 
through content and materials that may be posted by users in classifieds, 
bulletin board and chat room services offered by the Company. Such claims 
might include, among others, that by providing hypertext links to Web sites 
operated by third parties, the Company is liable for copyright or trademark 
infringement or other wrongful actions by such third parties through such Web 
sites. It is also possible that if any information provided through the 
Company's services, such as stock quotes, analyst estimates or other trading 
information, contains errors, third parties could make claims against the 
Company for losses incurred in reliance on such information.  In connection 
with the acquisition of Four11 Corporation, the Company recently began 
offering Web-based email services, which expose the Company 

                                          16
<PAGE>

to potential risks, such as liabilities or claims resulting from unsolicited
email (spamming), lost or misdirected messages, illegal use of e-mail or
interruptions or delays in e-mail service.

    From time to time, the Company enters into agreements with sponsors, 
content providers, service providers and merchants under which the Company is 
entitled to receive a share of revenue from the purchase of goods and 
services by users of the Company's online properties. Such arrangements may 
expose the Company to additional legal risks and uncertainties, including 
(without limitation) potential liabilities to consumers of such products and 
services. Although the Company carries general liability insurance, the 
Company's insurance may not cover potential claims of this type or may not be 
adequate to indemnify the Company for all liability that may be imposed.

RISKS ASSOCIATED WITH INTERNATIONAL OPERATIONS AND EXPANSION

    A key part of the Company's strategy is to develop "Yahoo!" branded 
online properties in international markets. The Company has developed and 
operates, through joint ventures with SOFTBANK and related entities, versions 
of the YAHOO! Internet Guide localized for Japan, Germany, France, the U.K 
and Korea. The Company offers a version of YAHOO! localized for Canada under 
an agreement with Rogers Communications, and the Company operates localized 
or mirror versions of YAHOO! through wholly owned subsidiaries in Australia 
and Singapore.

    To date, the Company has only limited experience in developing localized 
versions of its products and marketing and operating its products and 
services internationally, and the Company relies substantially on the efforts 
and abilities of its foreign business partners in such activities.  The 
Company has experienced and expects to continue to experience higher costs as 
a percentage of revenues in connection with international online properties 
than domestic online properties.  If the international revenues are not 
adequate to offset investments in such activities, the Company's business, 
operating results and financial condition could be materially adversely 
affected. The Company may experience difficulty in managing international 
operations as a result of distance as well as language and cultural 
differences, and there can be no assurance that the Company or its partners 
will be able to successfully market and operate its products and services in 
foreign markets.  The Company also believes that in light of substantial 
anticipated competition, it will be necessary to move quickly into 
international markets in order to effectively obtain market share, and there 
can be no assurance that the Company will be able to do so.  In addition to 
the uncertainty as to the Company's ability to continue to generate revenues 
from its foreign operations and expand its international presence, there are 
certain risks inherent in doing business on an international level, such as 
unexpected changes in regulatory requirements, trade barriers, difficulties 
in staffing and managing foreign operations, longer payment cycles, problems 
in collecting accounts receivable, political instability, fluctuations in 
currency exchange rates, seasonal reductions in business activity in certain 
other parts of the world and potentially adverse tax consequences. There can 
be no assurance that one or more of such factors will not have a material 
adverse effect on the Company's future international operations and, 
consequently, on the Company's business, operating results and financial 
condition.

CONCENTRATION OF STOCK OWNERSHIP 

    As of September 30, 1997, the present directors, executive officers,
greater than 5% shareholders and their respective affiliates beneficially owned
approximately 71% of the outstanding Common Stock of the Company. As of
September 30, 1997, SOFTBANK beneficially owned approximately 33% of the
outstanding Common Stock of the Company. As a result of their ownership, the
directors, executive officers, greater than 5% shareholders (including SOFTBANK)
and their respective affiliates collectively are able to control all matters
requiring shareholder approval, including the election of directors and approval
of significant corporate transactions. Such concentration of ownership may also
have the effect of delaying or preventing a change in control of the Company.

                                          17
<PAGE>

VOLATILITY OF STOCK PRICE 

    The trading price of the Company's Common Stock has been and may continue
to be subject to wide fluctuations in response to a number of events and
factors, such as quarterly variations in operating results, announcements of
technological innovations or new products and media properties by the Company or
its competitors, changes in financial estimates and recommendations by
securities analysts, the operating and stock price performance of other
companies that investors may deem comparable to the Company, and news reports
relating to trends in the Company's markets. In addition, the stock market in
general, and the market prices for Internet-related companies in particular,
have experienced extreme volatility that often has been unrelated to the
operating performance of such companies. These broad market and industry
fluctuations may adversely affect the trading price of the Company's Common
Stock, regardless of the Company's operating performance. 

LEGAL PROCEEDINGS

    In July 1997, GTE New Media Services Incorporated ("GTE New Media"), an
affiliate of GTE, filed suit in Dallas, Texas, against Netscape Communications
Corporation ("Netscape") and the Company, in which GTE New Media made a number
of claims relating to the inclusion of certain Yellow Pages hypertext links in
the "Netscape Guide by Yahoo!", an online navigational property operated by the
Company under an agreement with Netscape.  In this lawsuit, GTE New Media has
alleged, among other things, that by including links to the Yellow Pages service
operated by several Regional Bell Operating Companies (the "RBOCs") within the
Netscape Guide, the Company has tortiously interfered with an alleged
contractual relationship between GTE New Media and Netscape relating to
placement of links by Netscape for a Yellow Pages service operated by GTE New
Media.  GTE New Media seeks injunctive relief as well as actual and punitive
damages.  In October 1997, GTE New Media brought suit in the U.S. District Court
for the District of Columbia, against the RBOCs, Netscape and the Company, in
which GTE alleges, among other things, that the alleged exclusion of the GTE New
Media Yellow Pages from the Netscape Guide Yellow Pages service violates federal
antitrust laws, and GTE New Media seeks injunctive relief and damages (trebled
under federal antitrust laws) from such alleged actions.  The Company believes
that the claims against the Company in these lawsuits are without merit and
intends to contest them vigorously.  Although the Company cannot predict with
certainty the outcome of these lawsuits or the expenses that may be incurred in
defending the lawsuits, the Company does not believe that the result in the
lawsuits will have a material adverse effect on the Company's financial position
or results of operations.

    From time to time the Company has been, and expects to continue to be,
subject to other legal proceedings and claims in the ordinary course of its
business, including, among others, contractual disputes with advertisers and
content distribution providers, and claims of alleged infringement of the
trademarks and other intellectual property rights of third parties by the
Company and its licensees.  Such claims, even if not meritorious, could result
in the expenditure of significant financial and managerial resources.  Although
the Company cannot predict the outcome of any proceeding, the Company is not
currently aware of any such legal proceedings or claims that the Company
believes will have, individually or in the aggregate, a material adverse effect
on the Company's financial position or results of operations. 

ANTITAKEOVER EFFECT OF CERTAIN CHARTER PROVISIONS

    The Board of Directors has the authority to issue up to 10,000,000 shares
of Preferred Stock and to determine the price, rights, preferences, privileges
and restrictions, including voting rights, of those shares without any further
vote or action by the shareholders. The rights of the holders of Common Stock
may be subject to, and may be adversely affected by, the rights of the holders
of any Preferred Stock that may be issued in the future. The issuance of
Preferred Stock may have the effect of delaying, deferring or preventing a
change of control of the Company without further action by the shareholders and
may adversely affect the voting and other rights of the holders of Common Stock.
The Company has no present plans to issue shares of Preferred Stock. Further,
certain provisions of the Company's charter documents, including provisions
eliminating the ability of shareholders to take action by written consent and
limiting the ability of shareholders to raise matters at a meeting of
shareholders without giving advance notice, may have the effect of delaying or
preventing changes in control or management of 

                                          18
<PAGE>

the Company, which could have an adverse effect on the market price of the
Company's Common Stock. In addition, effective upon qualification of the Company
as a "listed corporation," as defined in Section 301.5(d) of the California
Corporations Code, the Company's charter documents eliminated cumulative voting
and provide that, at such time as the Company has at least six directors, the
Company's Board of Directors will be divided into two classes, each of which
serves for a staggered two-year term, which may make it more difficult for a
third party to gain control of the Company's Board of Directors.


                                          19
<PAGE>

                                   USE OF PROCEEDS

    The proceeds from the sale of the shares are solely for the account of the
Selling Shareholders.  Accordingly, the Company will not receive any proceeds
from the sale of the shares from the Selling Shareholders.

                                 SELLING SHAREHOLDERS

    The following table sets forth certain information known to the Company 
with respect to beneficial ownership of the Company's Common Stock as of 
October 20, 1997 by each Selling Shareholder.  As of November 4, 1997, none 
of the Selling Shareholders owned more than one percent of the Company's 
outstanding shares. Except as indicated, none of the Selling Shareholders has 
held any position or office (other than a non-officer employment 
relationship) or had any other material relationship with the Company or any 
of its affiliates within the past three years other than as a result of the 
ownership of the Company's Common Stock. The Company may amend or supplement 
this Prospectus from time to time to update the disclosure set forth herein.

<TABLE>
<CAPTION>
                                              SHARES BENEFICIALLY     SHARES OFFERED     SHARES BENEFICIALLY
                                                OWNED(1) PRIOR           BY THIS            OWNED(1) AFTER 
      SELLING SHAREHOLDERS                      TO THE OFFERING         PROSPECTUS          THE OFFERING(2) 
    ---------------------------------------   -------------------     --------------     -------------------- 
    <S>                                       <C>                     <C>                <C>
    Anderson, Chris........................        32,558                 32,558                    0
    Campbell, David........................         1,048                  1,048                    0
    Den Haan, Laura........................         1,645                     23                1,622
    Draper Fisher Associates Fund III, LP..       435,866                435,866                    0
    Draper Fisher Partners LLC.............        28,326                 28,326                    0
    Drebes, Larry..........................       289,765                289,765                    0
    4C Ventures, L.P. .....................       162,789                162,789                    0
    GCWF Investment Partners...............         1,953                  1,953                    0
    Graves, William C. ....................         8,152                  8,152                    0
    Innovocam 2............................        65,115                 65,115                    0
    Kirsch, William........................         4,118                  4,118                    0
    Kosowsky, Richard......................        11,926                 11,926                    0
    Labrador Ventures II, LP...............        90,034                 90,034                    0
    Lysander L.L.C. .......................        13,022                 13,022                    0
    Main, Robert A. .......................         3,475                    724                2,751
    McDonald, Lori A. .....................         2,316                    463                1,853
    McLaughlin, Glen.......................         6,065                  6,065                    0
    Nakayama, David H. ....................        10,431                  1,159                9,272
    Nelson, Dru R. ........................           313                    313                    0
    Ralston, Geoff.........................        70,676                 11,180               59,496
    Rubino, Vincent C. ....................         4,287                    313                3,974
    Santullo, Michael......................       289,765                289,765                    0
    Tang, Ben..............................         2,318                  2,318                    0
    Venture Lending, a Division                                                                     
       of Cupertino National                                                                        
       Bank & Trust........................         4,883                  4,883                    0
    Victorino, Stephen J. .................        59,498                 59,498                    0
    Woods, Brian R. .......................         3,243                    458                2,785
</TABLE>
- --------------------
(1) The number and percentage of shares beneficially owned is determined in 
    accordance with Rule 13d-3 of the Exchange Act, and the information is 
    not necessarily indicative of beneficial ownership for any other purpose. 
    Under such rule, beneficial ownership includes any shares as to which the 
    individual has sole or shared voting power or investment power and also 
    any shares which the indivual has the right to acquire within 60 days of 
    November 5, 1997 through the exercise of any stock option or other right. 
    Unless otherwise indicated in the footnotes, each person has sole voting 
    and investment power (or shares such powers with his or her spouse) with 
    respect to the shares shown as beneficially owned.

(2) Assumes that each Selling Shareholder will sell all of the Shares set 
    forth above under "Shares Offered By This Prospectus." There can be no 
    assurance that the Selling Shareholders will sell all or any of the 
    Shares offered hereunder.

                                          20
<PAGE>

                   ISSUANCE OF COMMON STOCK TO SELLING SHAREHOLDERS

    On October 20, 1997, the Company issued an aggregate of 1,505,720 shares of
Common Stock to the shareholders of Four11 Corporation ("Four11") pursuant to an
Agreement and Plan of Reorganization (the "Merger Agreement") among the Company,
ST Acquisition Corporation, a California corporation and a wholly-owned
subsidiary of the Company (the "Sub"), and Four11.  In addition, the Company
assumed warrants to purchase Four11 stock which now represent warrants to
purchase an aggregate of 16,114 shares of the Company's Common Stock.  Under the
terms of the Merger Agreement, Sub merged into Four11 and Four11 became a
wholly-owned subsidiary of the Company.

                                 PLAN OF DISTRIBUTION

    Shares of Common Stock covered hereby may be offered and sold from time 
to time by the Selling Shareholders.  The Selling Shareholders will act 
independently of the Company in making decisions with respect to the timing, 
manner and size of each sale. The Shares may be sold by one or more of the 
following means of distribution: (a) a block trade in which the broker-dealer 
so engaged will attempt to sell Shares as agent, but may position and resell 
a portion of the block as principal to facilitate the transaction; (b) 
purchases by a broker-dealer as principal and resale by such broker-dealer 
for its own account pursuant to this Prospectus; (c) an over-the-counter 
distribution in accordance with the rules of the Nasdaq National Market; (d) 
ordinary brokerage transactions and transactions in which the broker solicits 
purchasers; and (e) in privately negotiated transactions. To the extent 
required, this Prospectus may be amended and supplemented from time to time 
to describe a specific plan of distribution. In connection with distributions 
of the Shares or otherwise, the Selling Shareholders may enter into hedging 
transactions with broker-dealers or other financial institutions. In 
connection with such transactions, broker-dealers or other financial 
institutions may engage in short sales of the Company's Common Stock in the 
course of hedging the positions they assume with Selling Shareholders. The 
Selling Shareholders may also sell the Company's Common Stock short and 
redeliver the shares to close out such short positions. The Selling 
Shareholders may also enter into option or other transactions with 
broker-dealers or other financial institutions which require the delivery to 
such broker-dealer or other financial institution of Shares offered hereby, 
which Shares such broker-dealer or other financial institution may resell 
pursuant to this Prospectus (as supplemented or amended to reflect such 
transaction). The Selling Shareholders may also pledge Shares to a 
broker-dealer or other financial institution, and, upon a default, such 
broker-dealer or other financial institution may effect sales of the pledged 
Shares pursuant to this Prospectus (as supplemented or amended to reflect 
such transaction). In addition, any Shares that qualify for sale pursuant to 
Rule 144 may be sold under Rule 144 rather than pursuant to this Prospectus. 
In effecting sales, brokers, dealers or agents engaged by the Selling 
Shareholders may arrange for other brokers or dealers to participate.  The 
Selling Shareholders and any underwriter, dealer or agent who participate in 
the distribution of such shares may be deemed to be "underwriters" under the 
Securities Act, and any discount, commission or concession received by such 
persons might be deemed to be an underwriting discount or commission under 
the Securities Act.  The Company has agreed to indemnify the Selling 
Shareholders against certain liabilities arising under the Securities Act.

    Broker-dealers and agents may receive commissions from the Selling 
Shareholders (and, if acting as agent for the purchaser of such shares, from 
such purchaser) in amounts to be negotiated prior to the sale.  Usual and 
customary brokerage fees will be paid by the Selling Shareholders.  
Broker-dealers may agree with the Selling Shareholders to sell a specified 
number of shares at a stipulated price per share, and, to the extent such a 
broker-dealer is unable to do so acting as agent for the Selling 
Shareholders, to purchase as principal any unsold shares at the price 
required to fulfill the broker-dealer commitment to the Selling Shareholders. 
Broker-dealers who acquire shares as principal may thereafter resell such 
shares from time to time in transactions (which may involve crosses and block 
transactions and which may involve sales to and through other broker-dealers, 
including transactions of the nature described above) in the over-the-counter 
market, in negotiated transactions or by a combination of such methods of 
sale or otherwise at market prices prevailing at the time of sale or at 
negotiated prices, and in connection with such resales may pay to or receive 
from the purchasers of such shares commissions computed as described above.

    The Company has advised the Selling Shareholders that the anti-manipulation
rules under the Exchange Act may apply to sales of Shares in the market and to
the activities of the Selling Shareholders and their affiliates.  The Selling
Shareholders have advised the Company that during such time as the Selling
Shareholders may be engaged in the attempt to sell shares registered hereunder,
they will:  (i) not engage in any stabilization activity in connection with any
of the Company's securities; (ii) not bid for or purchase any of the Company's
securities or any rights to acquire the Company's securities, or attempt to
induce any person to purchase any of the Company's securities or rights to
acquire the Company's securities other than as permitted under the Exchange Act;
(iii) not effect any sale or distribution of the Shares until after the
Prospectus shall have been appropriately amended or supplemented, if required,
to set forth the terms thereof; and (iv) effect all sales of Shares in broker's
transactions through broker-dealers acting as agents, in transactions directly
with market makers or in privately negotiated transactions where no broker or
other third party (other than the purchaser) is involved.

    The Selling Shareholders may indemnify any broker-dealer that participates
in transactions involving the sale of the shares against certain liabilities,
including liabilities arising under the Securities Act.  Any commissions paid or
any discounts or concessions allowed to any such broker-dealers, and any profits
received on the resale of such shares, may be deemed to be underwriting
discounts and commissions under the Securities Act if any such broker-dealers
purchase shares as principal.

                                          21
<PAGE>

    In order to comply with the securities laws of certain states, if
applicable, the Common Stock will be sold in such jurisdictions only through
registered or licensed brokers or dealers.  In addition, in certain states, the
Common Stock may not be sold unless such shares have been registered or
qualified for sale in the applicable state or an exemption from the registration
or qualification requirement is available and is complied with.

    The Company has agreed to maintain the effectiveness of this Registration
Statement with respect to the shares of Common Stock offered hereunder by the
Selling Shareholders until the earlier of the sale of such shares or October 20,
1998.  No sales may be made pursuant to this Prospectus after such date unless
the Company amends or supplements this Prospectus to indicate that it has agreed
to extend such period of effectiveness.  There can be no assurance that the
Selling Shareholders will sell all or any of the shares of Common Stock offered
hereunder.

                                    LEGAL MATTERS

    The validity of the shares of Common Stock offered hereby will be passed
upon by Venture Law Group, A Professional Corporation, Menlo Park, California,
counsel to the Company.  As of November 4, 1997, certain attorneys of Venture
Law Group owned in the aggregate 3,187 shares of Common Stock of the Company.

                                       EXPERTS

    The consolidated financial statements of Yahoo! Inc. incorporated in this 
Prospectus by reference to the Company's Annual Report on Form 10-K for the 
year ended December 31, 1996 and the supplementary consolidated financial 
statements of Yahoo! Inc. and the financial statements of Four11 Corporation, 
incorporated in this Prospectus by reference to the Company's Current Report 
on Form 8-K/A dated October 14, 1997 (as amended October 30, 1997) have been 
so incorporated in reliance on the reports of Price Waterhouse LLP, 
independent accountants, given on the authority of said firm as experts in 
auditing and accountancy.

                                          22
<PAGE>

                                       PART II
                                           
                      INFORMATION NOT REQUIRED IN THE PROSPECTUS
                                           
Item 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

The Registrant will bear no expenses in connection with any sale or other
distribution by the Selling Shareholders of the shares being registered other
than the expenses of preparation and distribution of this Registration Statement
and the Prospectus included in this Registration Statement.  Such expenses are
set forth in the following table.  All of the amounts shown are estimates except
the Securities and Exchange Commission ("SEC") registration fee and the NASD
listing fee.

                        SEC registration fee            $ 19,023
                        Legal fees and expenses           15,000
                        Accounting fees and expenses      10,000
                        NASD listing fee                  17,500
                        Miscellaneous expenses             3,477
                                                      ----------
                        Total                           $ 65,000
                                                      ----------
                                                      ----------

Item 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

    Section 317 of the California Corporations Code allows for the
indemnification of officers, directors, and other corporate agents in terms
sufficiently broad to indemnify such persons under certain circumstances for
liabilities (including reimbursement for expenses incurred) arising under the
Securities Act of 1933, as amended (the "Securities Act").  Article VII of the
Registrant's Articles of Incorporation and Article VI of the Registrant's Bylaws
provide for indemnification of the Registrant's directors, officers, employees
and other agents to the extent and under the circumstances permitted by the
California Corporations Code.  The Registrant has also entered into agreements
with its directors and officers that will require the Registrant, among other
things, to indemnify them against certain liabilities that may arise by reason
of their status or service as directors to the fullest extent not prohibited by
law.

    In connection with this offering, the Selling Shareholders have agreed to
indemnify the Registrant, its directors and officers and each such person who
controls the Registrant, against any and all liability arising from inaccurate
information provided to the Registrant by the Selling Shareholders and contained
herein up to a maximum of the proceeds received by the Selling Shareholders from
the sale of their Shares hereunder.

Item 16. EXHIBITS.

         EXHIBITS.
              2.1     Agreement and Plan of Reorganization dated as of October
                      7, 1997, by and among Yahoo! Inc., ST Acquisition
                      Corporation, and Four11 Corporation.(1)

              5.1     Opinion of Venture Law Group, A Professional Corporation

              23.1    Consent of Price Waterhouse LLP, Independent Accountants
                      (see page II-4)

              23.2    Consent of Price Waterhouse LLP, Independent Accountants
                      (see page II-5)

              23.3    Consent of Venture Law Group, A Professional Corporation
                      (included in Exhibit 5.1)

              24.1    Power of Attorney (see page II-3)

                                         II-1

<PAGE>

- --------------------
(1)  Incorporated by reference to Exhibit 2.1 to the Company's Current Report on
         Form 8-K filed with the Commission on October 14, 1997.

Item 17. UNDERTAKINGS.

The undersigned Registrant hereby undertakes:

    (1)  To file, during any period in which offers or sales are being made, a
         post-effective amendment to this Registration Statement to include any
         material information with respect to the plan of distribution not
         previously disclosed in the Registration Statement or any material
         change to such information in the Registration Statement.

    (2)  That, for the purpose of determining any liability under the
         Securities Act, each post-effective amendment shall be deemed to be a
         new registration statement relating to the securities offered therein,
         and the offering of such securities at that time shall be deemed to be
         the initial bona fide offering thereof.

    (3)  To remove from registration by means of a post-effective amendment any
         of the securities being registered which remain unsold at the
         termination of this offering.

    (4)  That, for purposes of determining any liability under the Securities
         Act, each filing of the Registrant's annual report pursuant to Section
         13(a) or Section 15(d) of the Exchange Act that is incorporated by
         reference in the Registration Statement shall be deemed to be a new
         registration statement relating to the securities offered therein, and
         the offering of such securities at that time shall be deemed to be the
         initial bona fide offering thereof.

    Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the foregoing provisions, or otherwise, the Registrant
has been advised that in the opinion of the SEC such indemnification is against
public policy as expressed in the Securities Act and is, therefore,
unenforceable.  In the event that a claim for indemnification against such
liabilities (other than the payment by the Registrant of expenses incurred or
paid by a director, officer or controlling person of the Registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act and will be governed by the final
adjudication of such issue.

                                         II-2

<PAGE>

                                      SIGNATURES
    Pursuant to the requirements of the Securities Act of 1933, Yahoo! Inc. 
certifies that it has reasonable grounds to believe that it meets all of the 
requirements for filing on Form S-3 and has duly caused this registration 
statement to be signed on its behalf by the undersigned, thereunto duly 
authorized, in the City of Santa Clara, State of California, on November 5, 
1997.

                        YAHOO! INC.

                        By:  /s/ TIMOTHY KOOGLE
                             --------------------
                             Timothy Koogle
                             President and Chief Executive Officer

                                  POWER OF ATTORNEY

    KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints Timothy Koogle and Gary
Valenzuela, jointly and severally, his or her true and lawful attorneys-in-fact,
each with full power of substitution, for him or her in any and all capacities,
to sign any and all amendments (including post-effective amendments) to this
Registration Statement, and to file the same, with all exhibits thereto and all
documents in connection therewith, with the Securities and Exchange Commission,
hereby ratifying and confirming all that each of said attorneys-in-fact or any
of them, or his or their substitute or substitutes, may lawfully do or cause to
be done or by virtue hereof.

    Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>
 

          Signature                               Title                               Date
    <S>                      <C>                                               <C>
    /s/ TIMOTHY KOOGLE       President, Chief Executive Officer and Director   November 5, 1997
     ------------------
    Timothy Koogle           (Principal Executive Officer)

    /s/ GARY VALENZUELA      Senior Vice President, Finance and                November 5, 1997
     -------------------
    Gary Valenzuela          Administration, and Chief Financial Officer
                             (Principal Financial Officer)

    /s/ JAMES J. NELSON      Vice President, Finance                           November 5, 1997
     -------------------
    James J. Nelson          (Principal Accounting Officer)

    /s/ ERIC HIPPEAU         Director                                          November 5, 1997
    --------------------
    Eric Hippeau             

    /s/ ARTHUR H. KERN       Director                                          November 5, 1997
     ------------------
    Arthur H. Kern           


    /s/ MICHAEL MORITZ       Director                                          November 5, 1997
     ------------------
     Michael Moritz          

    /s/ JERRY YANG           Director                                          November 5, 1997
     ------------------
    Jerry Yang               

</TABLE>
 

                                         II-3
<PAGE>


                                                             EXHIBIT 23.1
                                           
                          CONSENT OF INDEPENDENT ACCOUNTANTS

    We hereby consent to the incorporation by reference in the Prospectus 
constituting part of this Registration Statement on Form S-3 of our report 
dated January 14, 1997, except as to the pooling of interests with Four11 
Corporation which is as of October 20, 1997, which appears as Exhibit 99.1 to 
the Current Report on Form 8K/A dated October 14, 1997 (as amended October 
30, 1997).  We also consent to the incorporation by reference of our report 
on the Financial Statement Schedule, which appears on page 26 of Yahoo! 
Inc.'s Annual Report on Form 10-K for the year ended December 31, 1996. We 
also consent to the reference to us under the heading "Experts" in such 
Prospectus. 

/s/ PRICE WATERHOUSE LLP



San Jose, California
October 30, 1997

                                         II-4


<PAGE>

                                                                  EXHIBIT 23.2


                     CONSENT OF INDEPENDENT ACCOUNTANTS


     We hereby consent to the incorporation by reference in the Prospectus 
constituting part of this Registration Statement on Form S-3 of our report 
dated October 6, 1997, except as to Note 9, which is as of October 20, 1997, 
on the financial statements of Four11 Corporation which appears in Item 7(a) 
of the Current Report on Form 8-K/A of Yahoo! Inc. dated October 14, 1997 (as 
amended October 30, 1997). We also consent to the reference to us under the 
heading "Experts" in such Prospectus.

/s/ PRICE WATERHOUSE LLP

San Jose, California
October 30, 1997


                                         II-5

<PAGE>

                                  INDEX TO EXHIBITS

  Exhibit Number    Description
  -------------    -------------
     2.1           Agreement and Plan of Reorganization dated as of October 7,
                   1997, by and among Yahoo! Inc., ST Acquisition Corporation,
                   and Four11 Corporation (1)

     5.1           Opinion of Venture Law Group, A Professional Corporation

     23.1          Consent of Price Waterhouse LLP, Independent Accountants (see
                   page II-4)

     23.2          Consent of Price Waterhouse LLP, Independent Accountants (see
                   page II-5)

     23.3          Consent of Venture Law Group, a Professional Corporation
                   (included in Exhibit 5.1)

     24.1          Power of Attorney (see page II-3)

- ---------------

(1)  Incorporated by reference to Exhibit 2.1 to the Company's Current Report 
          on Form 8-K filed with the Commission on October 14, 1997.


<PAGE>

                                                                EXHIBIT 5.1

                                  OPINION OF COUNSEL
                                           
                                           
                                  November 5, 1997 
                                           

Yahoo! Inc.
3400 Central Expressway, Suite 201
Santa Clara, CA 95051

    REGISTRATION STATEMENT ON FORM S-3

Ladies and Gentlemen:

    We have examined the Registration Statement on Form S-3 to be filed by you
with the Securities and Exchange Commission on or about November 5, 1997 (the
"Registration Statement") in connection with the registration under the
Securities Act of 1933, as amended, of a total of 1,521,834 shares of your
Common Stock (the "Shares"), to be sold by certain shareholders listed in the
Registration Statement (the "Selling Shareholders").  As your legal counsel, we
have examined the proceedings taken and are familiar with the proceedings
proposed to be taken by you in connection with the sale of the Shares by the
Selling Shareholders in the manner set forth in the Registration Statement in
the section entitled "Plan of Distribution."

    It is our opinion that the Shares, when sold by the Selling Shareholders in
the manner referred to in the Registration Statement, will be legally and
validly issued, fully paid and nonassessable.

    We consent to the use of this opinion as an exhibit to the Registration
Statement and further consent to the use of our name wherever it appears in the
Registration Statement and any amendments to it.

                                  Sincerely,

                                  VENTURE LAW GROUP
                                  A Professional Corporation


                                  /s/ VENTURE LAW GROUP



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