UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549





FORM 20-F/A







| ̈ | REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ----------------------------------------------------------------------------------------------

OR



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

For the fiscal year ended: 28 December 2012

OR



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

OR



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

Date of event requiring this shell company report

For the transition period from  to

Commission file number 001-35265





CSR plc

(Exact name of
Registrant as specified in its charter)





ENGLAND

(Jurisdiction of incorporation or organization)

Churchill House, Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ, England,

Tel: +44
(0) 1223 692 000

(Address of principal executive offices)

Adam R. Dolinko, General Counsel  Tel: +44 (0) 1223 692 000, Fax: +44 (0) 1223 692 001

Churchill House, Cambridge Business Park, Cowley Road, Cambridge CB4 0WZ, England

(Name, Telephone, E-mail and/or Facsimile number and Address of Company Contact Person)

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



|                                            |  |                                          
|------------------------------------------- |  | -----------------------------------------
|Title of Each Class                         |  | Name of Each Exchange on which Registered
|Ordinary shares, par value £0.001 per share |  | NASDAQ Global Select Market*             



|* | Listed, not for trading, but only in connection with the registration of the American Depositary Shares, each representing four (4) ordinary shares.
|- | ----------------------------------------------------------------------------------------------------------------------------------------------------





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

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act: None

Indicate
the number of outstanding shares of each of the issuers classes of capital or common stock as of the close of the period covered by the annual report.



|                                  |  |            
|--------------------------------- |  | -----------
|Ordinary Shares, par value £0.001 |  | 181,896,339

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

If
this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.    Yes   ̈    No  x

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  x    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   ̈    No   ̈

Not Applicable.

Indicate by check mark whether the
registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of accelerated filer and large accelerated filer in Rule 12b-2 of the Exchange Act. (Check one):



|                           |  |                      |  |                         
|-------------------------- |  | -------------------- |  | ------------------------
|Large accelerated filer  x |  | Accelerated filer   ̈ |  | Non-accelerated filer   ̈

Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this
filing:



|             |  |                                                                                                          |  |          
|------------ |  | -------------------------------------------------------------------------------------------------------- |  | ---------
|U.S.
GAAP   ̈ |  | International Financial Reporting Standards as issued by the
International Accounting Standards
Board  x |  | Other  
 ̈

If Other has been checked in response to the previous question, indicate by check mark which financial statement item
the registrant has elected to

follow.    Item 17   ̈    Item 18   ̈

If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in
Rule 12b-2 of the Exchange Act).

Yes  
 ̈    No  x

(APPLICABLE ONLY TO ISSUERS INVOLVED
IN BANKRUPTCY PROCEEDINGS DURING THE PAST FIVE YEARS.)

Indicate by check mark whether the registrant has filed all documents and reports required to be
filed by Sections 12, 13 or 15(d) of the Securities Exchange Act of 1934 subsequent to the distribution of securities under a plan confirmed by a court.    Yes   ̈    No   ̈









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Explanatory Note

This
Amendment No. 2 on Form 20-F/A to the 2012 annual report (the 2012 Report) on Form 20-F of CSR plc, as originally filed with the Securities and Exchange Commission (the SEC) on March 28, 2013, is being filed solely
to refile Exhibit 4.3 and Exhibit 4.7 to the 2012 Report as a result of the completion of the confidential treatment request process with the SEC.



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Signatures

The registrant hereby certifies that it meets all of the requirements for filing on Form 20-F and that it has duly caused and authorized the undersigned to sign this amended annual report on its behalf.



CSR plc(Registrant)/s/ Will GardinerName:

Will GardinerTitle:

Chief Financial OfficerDate:

3 September 2013




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Index to the Exhibits



|          |  |                                                                                                                                                                                                                                                                                                         
|--------- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|ExhibitNo |  | Description                                                                                                                                                                                                                                                                                             
|          | 
|1.1       |  | Memorandum of Association of CSR plc (incorporated by reference to the periodic report on Form 6-K of CSR plc filed with the SEC on January 24, 2011)                                                                                                                                                   
|          | 
|1.2       |  | Articles of Association of CSR plc (incorporated by reference to the periodic report on Form 6-K of
CSR plc filed with the SEC on January 24, 2011)                                                                                                                                                     
|          | 
|4.1       |  | XAP Technology Licence and XAP2 Development Agreement by and between Cambridge Consultants Limited and Cambridge Silicon Radio Limited (incorporated by reference to Exhibit 10.5 to the Registration Statement on Form F-4 (Registration No. 333-159615) of CSR plc filed with the SEC on May 29,
2009)
|          | 
|4.2       |  | Know-How and IPR Agreement by and between Cambridge Consultants Limited and Cambridge Silicon Radio Limited (incorporated by reference to Exhibit 10.6 to the Registration Statement on Form F-4 (Registration No. 333-159615) of CSR plc filed with the SEC on May 29, 2009)                           
|          | 
|4.3*      |  | Addendum to XAP Technology Licence and XAP2 Development Agreement and Related Agreements by and between Cambridge Consultants Limited and Cambridge Silicon Radio Limited                                                                                                                               
|          | 
|4.4       |  | Lease dated September 17, 2001, by and between CSR and Trinity College Cambridge (incorporated by reference to Exhibit 10.7 to the Registration Statement on Form F-4 (Registration No. 333-159615) of CSR plc filed with the SEC on May 29, 2009)                                                      
|          | 
|4.5       |  | Lease dated September 29, 2004, by and between CSR and The Crown Estates (incorporated by reference to Exhibit 10.8 to the Registration Statement on Form F-4 (Registration No. 333-159615) of
CSR plc filed with the SEC on May 29, 2009)                                                              
|          | 
|4.6       |  | Amended and Restated Agreement and Plan of Merger, dated as of June 16, 2011, by and among CSR plc, Zeiss Merger Sub, Inc. and Zoran Corporation (incorporated by reference to Exhibit 4.7 to the annual report on Form 20-F of CSR plc for the year ended December 31, 2010)                           
|          | 
|4.7*      |  | Asset and Share Transfer and Technology Licence Agreement, dated as of July 17, 2012, by and among CSR plc, Cambridge Silicon Radio Limited and Samsung Electronics, Co., Ltd., as
amended                                                                                                              
|          | 
|8         |  | List of subsidiaries of CSR plc (previously filed)                                                                                                                                                                                                                                                      
|          | 
|12.1      |  | Certification of Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a) (previously filed)                                                                                                                                                                                                        
|          | 
|12.2      |  | Certification of Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a) (previously filed)                                                                                                                                                                                                        
|          | 
|13.1      |  | Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. 1350 (previously filed)                                                                                                                                                                                      
|          | 
|15.1      |  | Consent of Independent Registered Public Accounting Firm (previously filed)                                                                                                                                                                                                                             



|* | Confidential treatment requested as to certain portions of this exhibit which portions have been omitted and submitted separately to the U.S. Securities and Exchange Commission.
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