UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549



Form 10-K/A

(Amendment No. 2)







|þ | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ------------------------------------------------------------------------------------

For the fiscal year ended December 31, 2015

OR



| ̈ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ----------------------------------------------------------------------------------------

For the transition period from
                     to

Commission File Number 000-28018



Yahoo! Inc.

(Exact name of Registrant as specified in its charter)



|                                                               |  |                                     
|-------------------------------------------------------------- |  | ------------------------------------
|Delaware                                                       |  | 77-0398689                          
|(State or other jurisdiction of incorporation or organization) |  | (I.R.S. Employer Identification No.)

701 First Avenue

Sunnyvale, California 94089

(Address of principal executive offices, including zip code)

Registrants telephone number, including area code: (408) 349-3300

Securities registered pursuant to Section 12(b) of the Act:



|                              |  |                                                          
|----------------------------- |  | ---------------------------------------------------------
|Title of Each Class           |  | Name of Each Exchange on Which
Registered                
|Common stock, $.001 par value |  | The NASDAQ Stock Market LLC
(NASDAQ Global Select Market)

Securities registered pursuant to Section 12(g) of the Act: None

(Title of Class)





Indicate by check mark if the
Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities
Act.    Yes  þ    No   ̈

Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the
Act.    Yes   ̈    No  þ

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities
Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past
90 days.    Yes  þ    No   ̈

Indicate by check mark whether the Registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data
File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such
files).    Yes  þ    No   ̈



Indicate by check mark if disclosure of delinquent filers pursuant to
Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of Registrants knowledge, in definitive proxy or information statements incorporated by reference in
Part III of this Form 10-K or any amendment to this Form 10-K.     þ

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller
reporting company. See definitions of large accelerated filer, accelerated filer, and smaller reporting company in Rule 12b-2 of the Exchange Act.



|                        |  |                                                 |  |                           |  |  
|----------------------- |  | ----------------------------------------------- |  | ------------------------- |  | -
|Large accelerated filer |  | þ                                               |  | Accelerated filer         |  |  ̈
|                        |  |                                                 | 
|Non-accelerated filer   |  |  ̈ (Do not check if a smaller reporting company) |  | Smaller reporting company |  |  ̈

Indicate by check mark whether the Registrant is a shell company (as defined by Rule 12b-2 of the Exchange
Act).    Yes   ̈    No  þ

As of June 30, 2015, the aggregate market value of voting stock held by non-affiliates of the Registrant, based upon the closing sales
price for the Registrants common stock, as reported on the NASDAQ Global Select Market, was $34,070,929,391. Shares of common stock held by each officer and director and by each person who owns 10 percent or more of the outstanding common
stock have been excluded in that such persons may be deemed to be affiliates. This determination of affiliate status is not necessarily a conclusive determination for any other purpose.

The number of shares of the Registrants common stock outstanding as of July 29, 2016 was 951,782,587.

DOCUMENTS INCORPORATED BY REFERENCE

The
following documents (or parts thereof) are incorporated by reference into the following parts of this Form 10-K: None









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EXPLANATORY NOTE

This Amendment No. 2 to Form 10-K (this Amendment) amends the Annual Report on Form 10-K for the
fiscal year ended December 31, 2015, originally filed on February 29, 2016 (the Original 10-K), of Yahoo! Inc., a Delaware corporation (the Company, or we). On April 29, 2016, we filed Amendment
No. 1 to the Original 10-K (the Prior Amendment). We are filing this Amendment to amend Item 15 to include the separate financial statements of Yahoo Japan Corporation and Consolidated Subsidiaries (Yahoo Japan) as
required by Regulation S-X Rule 3-09 (the Rule 3-09 financial statements), which were not included in the Original 10-K because Yahoo Japans fiscal year ended after the date of the filing of the Original 10-K. The Rule 3-09
financial statements include consolidated statements of financial position of Yahoo Japan as of March 31, 2016 and 2015, and the related consolidated statements of profit or loss, comprehensive income, changes in equity, and cash flows for each
of the three years in the period ended March 31, 2016. In accordance with Rule 3-09 of Regulation S-X, only the financial statements for the year ended March 31, 2014 are required to be audited. The Rule 3-09 financial statements as of
March 31, 2016 and March 31, 2015 and for the years ended March 31, 2016 and March 31, 2015 are unaudited. The Rule 3-09 financial statements were prepared and provided to the Company by Yahoo Japan.

This Amendment should be read in conjunction with the Original 10-K, the Prior Amendment and the Companys other filings
made with the Securities and Exchange Commission subsequent to the filing of the Original 10-K on February 29, 2016. The Original 10-K has not been amended or updated to reflect events occurring after February 29, 2016, except as
specifically set forth in the Prior Amendment and this Amendment.

Item 15.Exhibits and Financial Statement Schedules

(a) The following documents are filed as part of this report:

1. Consolidated Financial Statements:

The consolidated financial statements of the Company, as listed in Item 15 of the Original 10-K, are included in Item 8 of the
Original 10-K.

2. Financial Statement Schedules:

The financial statement schedules and supplementary financial data of the Company, as listed in Item 15 of the Original 10-K, are
included in Item 8 of the Original 10-K.

The financial statements of Yahoo Japan Corporation and its consolidated subsidiaries
required by Rule 3-09 of Regulation S-X are provided as Exhibit 99.1 to this Amendment.

3. Exhibits:

The exhibits listed in the Exhibit Index of the Original 10-K, the Prior Amendment and this Amendment are filed with, or incorporated by
reference in, this report.



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Signature

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this Amendment
to be signed on its behalf by the undersigned, thereunto duly authorized, on the 19th day of September 2016.



YAHOO! INC.By:

/S/ KEN GOLDMANKen GoldmanChief Financial Officer
(Principal Financial Officer)




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INDEX TO EXHIBITS

The following exhibits are included, or incorporated by reference, in this Amendment (and are numbered in accordance with Item 601 of
Regulation S-K). Pursuant to Item 601(a)(2) of Regulation S-K, this Exhibit Index immediately precedes the exhibits.



|               |  |                                                                                                                                                                                                                                               
|-------------- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit
Number |  | Description                                                                                                                                                                                                                                   
|23.2*          |  | Consent of Deloitte Touche Tohmatsu LLC, Independent Auditors of Yahoo Japan Corporation and Consolidated Subsidiaries.                                                                                                                       
|               | 
|31.5*          |  | Certificate of Chief Executive Officer Pursuant to Securities Exchange Act Rules 13a-14(a) and 15d-14(a) as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated September 19, 2016.                                      
|               | 
|31.6*          |  | Certificate of Chief Financial Officer Pursuant to Securities Exchange Act Rules 13a-14(a) and 15d-14(a) as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated September 19, 2016.                                      
|               | 
|32.2**         |  | Certificate of Chief Executive Officer and Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, dated September 19, 2016.                                        
|               | 
|99.1*          |  | Financial Statements of Yahoo Japan Corporation and Consolidated Subsidiaries as of March 31, 2016 and March 31, 2015 (unaudited) and for the years ended March 31, 2016 (unaudited), March 31, 2015 (unaudited) and
March 31, 2014 (audited).



* Filed herewith.

** Furnished
herewith.