20-F/A

As filed with the Securities and Exchange Commission on July 9, 2012

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 20-F/A

AMENDMENT NO. 1

ANNUAL REPORT

PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

for the fiscal year ended December 31, 2011

Commission File Number 001-15106 Petróleo Brasileiro S.A.—Petrobras (Exact name of registrant as specified in its charter)	Commission File Number: 001-33121 Petrobras International Finance Company (Exact name of registrant as specified in its charter)
Brazilian Petroleum Corporation—Petrobras (Translation of registrant’s name into English)
The Federative Republic of Brazil (Jurisdiction of incorporation or organization)	Cayman Islands (Jurisdiction of incorporation or organization)

___________________________

Avenida República do Chile, 65 20031-912 – Rio de Janeiro – RJ Brazil (Address of principal executive offices)       Almir Guilherme Barbassa (55 21) 3224-2040 – barbassa@petrobras.com.br Avenida República do Chile, 65 – 23rd Floor 20031-912 – Rio de Janeiro – RJ Brazil (Name, telephone, e-mail and/or facsimile number and address of company contact person) 4th Floor, Harbour Place 103 South Church Street P.O. Box 1034GT – BWI George Town, Grand Cayman Cayman Islands (Address of principal executive offices)   Sérvio Túlio da Rosa Tinoco (55 21) 3224-1410 – ttinoco@petrobras.com.br Avenida República do Chile, 65 – 3rd Floor 20031-912 – Rio de Janeiro – RJ Brazil (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:
Petrobras Common Shares, without par value*	New York Stock Exchange*
Petrobras American Depositary Shares, or ADSs (evidenced by American Depositary Receipts, or ADRs), each representing two Common Shares	New York Stock Exchange
Petrobras Preferred Shares, without par value*	New York Stock Exchange*
Petrobras American Depositary Shares (as evidenced by American Depositary Receipts), each representing two Preferred Shares	New York Stock Exchange
2.875% Global Notes due 2015, issued by PifCo	New York Stock Exchange
6.125% Global Notes due 2016, issued by PifCo	New York Stock Exchange
3.875% Global Notes due 2016, issued by PifCo	New York Stock Exchange
3.500% Global Notes due 2017, issued by PifCo	New York Stock Exchange
5.875% Global Notes due 2018, issued by PifCo	New York Stock Exchange
7.875% Global Notes due 2019, issued by PifCo	New York Stock Exchange
5.75% Global Notes due 2020, issued by PifCo	New York Stock Exchange
5.375% Global Notes due 2021, issued by PifCo	New York Stock Exchange
6.875% Global Notes due 2040, issued by PifCo	New York Stock Exchange
6.750% Global Notes due 2041, issued by PifCo	New York Stock Exchange

* Not for trading, but only in connection with the registration of American Depositary Shares pursuant to the requirements of the New York Stock Exchange.

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:

TITLE OF EACH CLASS:

9.125% Global Notes due 2013, issued by PifCo

7.75% Global Notes due 2014, issued by PifCo

8.375% Global Notes due 2018, issued by PifCo

4.875% Global Notes due 2018, issued by PifCo

5.875% Global Notes due 2022, issued by PifCo

6.250% Global Notes due 2026, issued by PifCo

The number of outstanding shares of each class of stock of Petrobras and PifCo as of December 31, 2011 was:

7,442,454,142 Petrobras Common Shares, without par value

5,602,042,788 Petrobras Preferred Shares, without par value

300,050,000 PifCo Common Shares, at par value U.S.$1 per share

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined by Rule 405 of the Securities Act.

Yes R No £

If this report is an annual or transitional 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 R

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 R 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 R (Petrobras)  No £

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” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer  R (Petrobras)  Accelerated filer £        Non-accelerated filer R (PifCo)

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 ROther £

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 R

EXPLANATORY NOTE

This Amendment No. 1 (“Amendment No. 1”) to the Annual Report on Form 20-F of Petróleo Brasileiro S.A.—Petrobras (“Petrobras”) and Petrobras International Finance Company (“PifCo”) for the fiscal year ended December 31, 2011 filed on March 30, 2011 (the “Original Form 20-F”) is being filed to revise the disclosure in Item 16F. Change in Registrant’s Certifying Accountant (“Item 16F”) in the Original Form 20-F.  Petrobras and PifCo are also including as Exhibit 16.1 to this Amendment No. 1 a copy of the letter from KPMG Auditores Independentes (“KPMG”), as required by Item 16F(a)(3) of Form 20-F.

Item 16F of the Original Form 20-F is revised by this Amendment No. 1 as follows:

Item 16F.                      Change in Registrant’s Certifying Accountant

On January 16, 2012, Petrobras and PifCo signed a contract with PricewaterhouseCoopers Auditores Independentes–PwC, under which PwC was hired to provide specialized technical accounting audit services for the fiscal years ended 2012, 2013 and 2014.  As a result of this contract, PwC replaced KPMG Auditores Independentes–KPMG, which provided specialized technical accounting audit services to Petrobras and PifCo for the fiscal years ended 2006 through 2011.  KPMG is engaged as the auditor of both Petrobras and PifCo for the fiscal years ended December 31, 2011, 2010 and 2009 until the filling of this Form 20-F with the Securities and Exchange Commission.

The change in auditors was made pursuant to regulations of the Comissão de Valores Mobiliários (Securities and Exchange Commission of Brazil, or CVM) that limit the consecutive terms that certain service providers may serve, and not as a result of KPMG’s resignation, dismissal or declination to stand for re-election.  Because of the limitations set forth in the applicable regulations, neither Petrobras nor PifCo sought to renew KPMG’s contract when it expired and KPMG did not attempt to stand for re-election.  The replacement of KPMG by PwC was approved by the board of directors of both Petrobras and PifCo as well as by the Audit Committee of Petrobras.

KPMG audited the financial statements of Petrobras and PifCo for the fiscal years ended December 31, 2011, 2010, 2009, 2008, 2007 and 2006. None of the reports of KPMG on the financial statements of Petrobras or PifCo for any of such fiscal years contained an adverse opinion or disclaimer of opinion, or was qualified or modified as to uncertainty, audit scope or accounting principles. During the two most recent fiscal years and until its contract expired, there were no disagreements with KPMG, whether or not resolved, on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure, which, if not resolved to KPMG’s satisfaction, would have caused it to make reference to the subject matter of the disagreement in connection with any reports it would have issued, and there were no "reportable events" as that term is defined in Item 16F(a)(1)(v) of Form 20-F. KPMG did not audit any of the financial statements of Petrobras or PifCo for any period subsequent to December 31, 2011.

Petrobras and PifCo have provided KPMG with a copy of the foregoing disclosure, and have requested that KPMG furnish to Petrobras and PifCo a letter addressed to the Securities and Exchange Commission stating whether or not KPMG agrees with such disclosure. Petrobras and PifCo are including as Exhibit 16.1 to this Form 20-F a copy of the letter from KPMG as required by Item 16F(a)(3) of Form 20-F.

During the fiscal years ended December 31, 2010 and December 31, 2011, neither Petrobras nor PifCo consulted with PwC regarding the application of accounting principles to a specific completed or proposed transaction or regarding the type of audit opinion that might be rendered by PwC on the financial statements of either Petrobras or PifCo. Further, PwC did not provide any written or oral advice that was an important factor considered by Petrobras or PifCo in reaching a decision as to any such accounting, auditing or financial reporting or any matter being the subject of disagreement or “reportable event” or any other matter as defined in Item 16F(a)(1)(v) of Form 20-F.

3

This Amendment No. 1 consists of a cover page, this explanatory note, Item 19, Exhibit 16.1 and the signature pages and the required certifications of the chief executive officer and chief financial officer of each of Petrobras and PifCo.

Except for the matters described above, this Amendment No. 1 does not modify or update disclosure in, or exhibits to, the Original Form 20-F.

4

Item 19.                      Exhibits

No.	Description
1.1	Amended Bylaws of Petróleo Brasileiro S.A.-Petrobras, dated as of February 28, 2012.
1.2	Memorandum and Articles of Association of Petrobras International Finance Company (incorporated by reference to Exhibit 1 to the Annual Report on Form 20-F of Petrobras International Finance Company, filed with the Securities and Exchange Commission on July 1, 2002, and amendments to which were filed on December 13, 2002, March 20, 2003 (File No. 333-14168) and June 26, 2007 and May 19, 2008 (File No. 001-331121). PifCo’s Memorandum and Articles of Association were last amended on February 23, 2008.
2.1	Amended and Restated Deposit Agreement, dated as of January 3, 2012, among Petrobras, The Bank of New York Mellon, as depositary, and registered holders and beneficial owners from time to time of the ADSs, representing the common shares of Petrobras, and Form of ADR evidencing ADSs representing the common shares of Petrobras.
2.2	Amended and Restated Deposit Agreement, dated as of January 3, 2012, among Petrobras, The Bank of New York Mellon, as depositary, and registered holders and beneficial owners from time to time of the ADSs, representing the preferred shares of Petrobras, and Form of ADR evidencing ADSs representing the preferred shares of Petrobras.
2.3	Indenture, dated as of July 19, 2002, between Petrobras International Finance Company and JPMorgan Chase Bank, as Trustee (incorporated by reference to exhibit 4.5 of the Registration Statement of Petrobras International Finance Company and Petrobras on Form F-3, filed with the Securities and Exchange Commission on July 5, 2002, and amendments to which were filed on July 19, 2002 and August 14, 2002 (File No. 333-92044-01)).
2.4	Amended and Restated First Supplemental Indenture, originally dated as of July 6, 2001, as supplemented as of November 26, 2001, as amended and restated as of March 31, 2010, among Petrobras International Finance Company, Petrobras and The Bank of New York Mellon, as Trustee, relating to the 9.750% Senior Notes due 2011 (incorporated by reference to Exhibit 2.8 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2010 (File Nos. 001-15106 and 001-33121)).
2.5	Amended and Restated Second Supplemental Indenture, initially dated as of July 2, 2003, as amended and restated as of September 18, 2003, as amended and restated as of March 31, 2010, among Petrobras International Finance Company, Petrobras and JPMorgan Chase Bank, as Trustee, relating to the 9.125% Global Notes due 2013 (incorporated by reference to Exhibit 2.9 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2010 (File Nos. 001-15106 and 001-33121)).
2.6	Amended and Restated Third Supplemental Indenture, initially dated as of December 10, 2003, as amended and restated as of March 31, 2010, among Petrobras International Finance Company, Petrobras and JPMorgan Chase Bank, as Trustee, relating to the 8.375% Global Notes due 2018 (incorporated by reference to Exhibit 2.10 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2010 (File Nos. 001-15106 and 001-33121)).
2.7	Indenture, dated as of July 6, 2001, between Petrobras International Finance Company and The Bank of New York Mellon, as Trustee, relating to the 9 ¾% Senior Notes due 2011 (incorporated by reference to Exhibit 4.1 to the Registration Statement of Petrobras International Finance Company and Petrobras on Form F-4, filed with the Securities and Exchange Commission on December 6, 2001 (File No. 333-14170)).
2.8	Amended and Restated Fourth Supplemental Indenture, initially dated as of September 15, 2004, as amended and restated as of March 31, 2010, between Petrobras International Finance Company, Petrobras and JPMorgan Chase Bank, as Trustee, relating to the 7.75% Global Notes due 2014 (incorporated by reference to Exhibit 2.12 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2010 (File Nos. 001-15106 and 001-33121)).
2.9	Registration Rights Agreement, dated as of July 6, 2001, among Petrobras International Finance Company, Petrobras, USB Warburg LLC, Banc of America Securities LLC, J.P. Morgan Securities Inc., RBC Dominion Securities Corporation and Santander Central Hispano Investment Securities Inc. (incorporated by reference to Exhibit 4.4 to the Registration Statement of Petrobras International Finance Company and Petrobras on Form F-4, filed with the Securities and Exchange Commission on December 6, 2001 (File No. 333-14170)).
2.10	Amended and Restated Fifth Supplemental Indenture, initially dated as of October 6, 2006, as amended and restated as of February 7, 2007, as amended and restated as of March 31, 2010, among Petrobras International Finance Company, Petrobras and The Bank of New York Mellon, as successor to JPMorgan Chase Bank, N.A., as Trustee, relating to the 6.125% Global Notes due 2016 (incorporated by reference to Exhibit 2.14 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2010 (File Nos. 001-15106 and 001-33121)).
2.11	Sixth Supplemental Indenture, dated as of February 10, 2012, among Petrobras International Finance Company, Petrobras and The Bank of New York Mellon, as Trustee.
2.12	Amended and Restated First Supplemental Indenture, initially dated as of November 1, 2007, as amended and restated as of January 11, 2008, as amended and restated as of March 31, 2010, among Petrobras International Finance Company, Petrobras and The Bank of New York Mellon, as Trustee, relating to the 5.875% Global Notes due 2018 (incorporated by reference to Exhibit 2.15 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2010 (File Nos. 001-15106 and 001-33121)).

5

No. Description

2.13	Guaranty for the 9.125% Global Notes due 2013, dated as of March 31, 2010, between Petrobras and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 2.16 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2010 (File Nos. 001-15106 and 001-33121)).
2.14	Amended and Restated Guaranty for the 9.125% Global Notes due 2013, dated as of February 10, 2012, between Petrobras and The Bank of New York Mellon, as Trustee.
2.15	Guaranty for the 8.375% Global Notes due 2018, dated as of March 31, 2010, between Petrobras and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 2.17 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2010 (File Nos. 001-15106 and 001-33121)).
2.16	Amended and Restated Guaranty for the 8.375% Global Notes due 2018, dated as of February 10, 2012, between Petrobras and The Bank of New York Mellon, as Trustee.
2.17	Master Export Contract, dated as of December 21, 2001, between Petrobras and Petrobras Finance Ltd. (incorporated by reference to Exhibit 2.14 to the Annual Report on Form 20-F of Petrobras International Finance Company, filed with the Securities and Exchange Commission on July 1, 2002, and amendments to which were filed on December 13, 2002 and March 20, 2003 (File No. 333-14168)).
2.18	Amendment to the Master Export Contract, dated as of May 21, 2003, among Petrobras and Petrobras Finance Ltd. (incorporated by reference to Exhibit 2.18 to the Annual Report on Form 20-F of Petrobras International Finance Company, filed with the Securities and Exchange Commission on June 19, 2003 (File No. 333-14168)).
2.19	Depositary Agreement, dated as of December 21, 2001, among U.S. Bank, National Association, Cayman Islands Branch, in capacity as Trustee of the PF Export Receivables Master Trust, Citibank, N.A., in capacity as Securities Intermediary, and Petrobras Finance Ltd. (incorporated by reference to Exhibit 2.15 to the Annual Report on Form 20-F of Petrobras International Finance Company, filed with the Securities and Exchange Commission on July 1, 2002, and amendments to which were filed on December 13, 2002 and March 20, 2003 (File No. 333-14168)).
2.20	Letter Agreement relating to the Depositary Agreement, dated as of May 16, 2003 (incorporated by reference to Exhibit 2.20 to the Annual Report on Form 20-F of Petrobras International Finance Company, filed with the Securities and Exchange Commission on June 19, 2003 (File No. 333-14168)).
2.21	Administrative Services Agreement, dated as of December 21, 2001, between Petrobras, as Delivery and Sales Agent, and Petrobras Finance Ltd. (incorporated by reference to Exhibit 2.16 to the Annual Report on Form 20-F of Petrobras International Finance Company, filed with the Securities and Exchange Commission on July 1, 2002, and amendments to which were filed on December 13, 2002 and March 20, 2003 (File No. 333-14168)).
2.22	Letter Agreement relating to the Administrative Services Agreement, dated as of May 16, 2003 (incorporated by reference to Exhibit 2.22 to the Annual Report on Form 20-F of Petrobras International Finance Company, filed with the Securities and Exchange Commission on June 19, 2003 (File No. 333-14168)).
2.23	Amended and Restated Trust Deed, dated as of December 21, 2001, among U.S. Bank, National Association, Cayman Islands Branch, in capacity as Trustee of the PF Export Receivables Master Trust, Citibank, N.A., in capacity as Paying Agent, Transfer Agent, Registrar and Depositary Bank, and Petrobras International Finance Company, as Servicer (incorporated by reference to Exhibit 2.17 to the Annual Report on Form 20-F of Petrobras International Finance Company, filed with the Securities and Exchange Commission on July 1, 2002, and amendments to which were filed on December 13, 2002 and March 20, 2003 (File No. 333-14168)).
2.24	Receivables Purchase Agreement, dated as of December 21, 2001, among Petrobras Finance Ltd., Petrobras and U.S. Bank, National Association, Cayman Islands Branch, solely in capacity as Trustee of the PF Export Receivables Master Trust (incorporated by reference to Exhibit 2.18 to the Annual Report on Form 20-F of Petrobras International Finance Company, filed with the Securities and Exchange Commission on July 1, 2002, and amendments to which were filed on December 13, 2002 and March 20, 2003 (File No. 333-14168)).
2.25	Amended and Restated Receivables Purchase Agreement, dated as of May 21, 2003, among Petrobras Finance Ltd., Petrobras and U.S. Bank, National Association, Cayman Islands Branch, solely in capacity as Trustee of the PF Export Receivables Master Trust (incorporated by reference to Exhibit 2.25 to the Annual Report on Form 20-F of Petrobras International Finance Company, filed with the Securities and Exchange Commission on June 19, 2003 (File No. 333-14168)).
2.26	Prepayment Agreement, dated as of December 21, 2001, between Petrobras and Petrobras Finance Ltd. (incorporated by reference to Exhibit 2.26 to the Annual Report on Form 20-F of Petrobras International Finance Company, filed with the Securities and Exchange Commission on June 19, 2003 (File No. 333-14168)).

6

No. Description

2.27	Amended and Restated Prepayment Agreement, dated as of May 2, 2003, between Petrobras and Petrobras Finance Ltd. (incorporated by reference to Exhibit 2.27 to the Annual Report on Form 20-F of Petrobras International Finance Company, filed with the Securities and Exchange Commission on June 19, 2003 (File No. 333-14168)).
2.28	Guaranty for the 7.75% Global Notes due 2014, dated as of March 31, 2010, between Petrobras and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 2.30 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2010 (File Nos. 001-15106 and 001-33121)).
2.29	Amended and Restated Guaranty for the 7.75% Global Notes due 2014, dated as of February 10, 2012, between Petrobras and The Bank of New York Mellon, as Trustee.
2.30	Guaranty for the 6.125% Global Notes due 2016, dated as of March 31, 2010, between Petrobras and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 2.31 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2010 (File Nos. 001-15106 and 001-33121)).
2.31	Amended and Restated Guaranty for the 6.125% Global Notes due 2016, dated as of February 10, 2012, between Petrobras and The Bank of New York Mellon, as Trustee.
2.32	Guaranty for the 5.875% Global Notes due 2018, dated as of March 31, 2010, between Petrobras and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 2.32 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2010 (File Nos. 001-15106 and 001-33121)).
2.33	Amended and Restated Guaranty for the 5.875% Global Notes due 2018, dated as of February 10, 2012, between Petrobras and The Bank of New York Mellon, as Trustee.
2.34	Amended and Restated Second Supplemental Indenture, initially dated as of February 11,2009, as amended and restated as of July 9, 2009, among Petrobras International Finance Company, Petrobras and The Bank of New York Mellon, as Trustee, relating to the 7.875% Global Notes due 2019 (incorporated by reference to Exhibit 2.33 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2010 (File Nos. 001-15106 and 001-33121)).
2.35	Amended and Restated Guaranty, initially dated as of February 11, 2009, as amended and restated as of July 9, 2009, between Petrobras and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 2.34 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2010 (File Nos. 001-15106 and 001-33121)).
2.36	Third Supplemental Indenture, dated as of October 30, 2009, among Petrobras International Finance Company, Petrobras and The Bank of New York Mellon, as Trustee, relating to the 5.75% Global Notes due 2020 (incorporated by reference to Exhibit 2.35 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2010 (File Nos. 001-15106 and 001-33121)).
2.37	Fourth Supplemental Indenture, dated as of October 30, 2009, among Petrobras International Finance Company, Petrobras and The Bank of New York Mellon, as Trustee, relating to the 6.875% Global Notes due 2040 (incorporated by reference to Exhibit 2.36 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2010 (File Nos. 001-15106 and 001-33121)).
2.38	Guaranty for the 5.75% Global Notes due 2020, dated as of October 30, 2009, between Petrobras and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 2.37 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2010 (File Nos. 001-15106 and 001-33121)).
2.39	Guaranty for the 6.875% Global Notes due 2040, dated as of October 30, 2009, between Petrobras and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 2.38 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2010 (File Nos. 001-15106 and 001-33121)).
2.40	Fifth Supplemental Indenture, dated as of January 27, 2011, among Petrobras International Finance Company, Petrobras and The Bank of New York Mellon, as Trustee, relating to the 3.875% Global Notes due 2016 (incorporated by reference to Exhibit 2.39 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2011 (File Nos. 001-15106 and 001-33121)).
2.41	Guaranty for the 3.875% Global Notes due 2016, dated as of January 27, 2011, between Petrobras and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 2.40 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2011 (File Nos. 001-15106 and 001-33121)).

7

No. Description

2.42	Sixth Supplemental Indenture, dated as of January 27, 2011, among Petrobras International Finance Company, Petrobras and The Bank of New York Mellon, as Trustee, relating to the 5.375% Global Notes due 2021 (incorporated by reference to Exhibit 2.41 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2011 (File Nos. 001-15106 and 001-33121)).
2.43	Amended and Restated Sixth Supplemental Indenture, dated as of February 6, 2012, among Petrobras International Finance Company, Petrobras and The Bank of New York Mellon, as Trustee, relating to the 5.375% Global Notes due 2021 (incorporated by reference to Exhibit 4.2 to Form 6-K of Petrobras and Petrobras International Finance Company, furnished to the Securities and Exchange Commission on February 6, 2012 (File Nos. 001-15106 and 001-33121)).
2.44	Guaranty for the 5.375% Global Notes due 2021, dated as of January 27, 2011, between Petrobras and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 2.42 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2011 (File Nos. 001-15106 and 001-33121)).
2.45	Amended and Restated Guaranty for the 5.375% Global Notes due 2021, dated as of February 6, 2012, between Petrobras and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 4.1 to Form 6-K of Petrobras and Petrobras International Finance Company, furnished to the Securities and Exchange Commission on February 6, 2012 (File Nos. 001-15106 and 001-33121)).
2.46	Seventh Supplemental Indenture, dated as of January 27, 2011, among Petrobras International Finance Company, Petrobras and The Bank of New York Mellon, as Trustee, relating to the 6.750% Global Notes due 2041 (incorporated by reference to Exhibit 2.43 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2011 (File Nos. 001-15106 and 001-33121)).
2.47	Amended and Restated Seventh Supplemental Indenture, dated as of February 6, 2012, among Petrobras International Finance Company, Petrobras and The Bank of New York Mellon, as Trustee, relating to the 6.750% Global Notes due 2041 (incorporated by reference to Exhibit 4.5 to Form 6-K of Petrobras and Petrobras International Finance Company, furnished to the Securities and Exchange Commission on February 6, 2012 (File Nos. 001-15106 and 001-33121)).
2.48	Guaranty for the 6.750% Global Notes due 2041, dated as of January 27, 2011, between Petrobras and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 2.44 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2011 (File Nos. 001-15106 and 001-33121)).
2.49	Amended and Restated Guaranty for the 6.750% Global Notes due 2041, dated as of February 6, 2012, between Petrobras and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 4.4 to Form 6-K of Petrobras and Petrobras International Finance Company, furnished to the Securities and Exchange Commission on February 6, 2012 (File Nos. 001-15106 and 001-33121)).
2.50	Eighth Supplemental Indenture, dated as of December 9, 2011, among Petrobras International Finance Company, Petrobras, The Bank of New York Mellon, as Trustee, The Bank of New York Mellon, London Branch, as Principal Paying Agent and The Bank of New York Mellon (Luxembourg) S.A., as Luxembourg Paying Agent, relating to the 4.875% Global Notes due 2018 (incorporated by reference to Exhibit 4.2 to Form 6-K of Petrobras and Petrobras International Finance Company, furnished to the Securities and Exchange Commission on December 9, 2011 (File Nos. 001-15106 and 001-33121)).
2.51	Guaranty for the 4.875% Global Notes due 2018, dated as of December 9, 2011, between Petrobras and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 4.1 to Form 6-K of Petrobras and Petrobras International Finance Company, furnished to the Securities and Exchange Commission on December 9, 2011 (File Nos. 001-15106 and 001-33121)).
2.52	Ninth Supplemental Indenture, dated as of December 9, 2011, among Petrobras International Finance Company, Petrobras, The Bank of New York Mellon, as Trustee, The Bank of New York Mellon, London Branch, as Principal Paying Agent and The Bank of New York Mellon (Luxembourg) S.A., as Luxembourg Paying Agent, relating to the 5.875% Global Notes due 2022 (incorporated by reference to Exhibit 4.5 to Form 6-K of Petrobras and Petrobras International Finance Company, furnished to the Securities and Exchange Commission on December 9, 2011 (File Nos. 001-15106 and 001-33121)).
2.53	Guaranty for the 5.875% Global Notes due 2022, dated as of December 9, 2011, between Petrobras and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 4.4 to Form 6-K of Petrobras and Petrobras International Finance Company, furnished to the Securities and Exchange Commission on December 9, 2011 (File Nos. 001-15106 and 001-33121)).
2.54	Tenth Supplemental Indenture, dated as of December 12, 2011, among Petrobras International Finance Company, Petrobras, The Bank of New York Mellon, as Trustee, The Bank of New York Mellon, London Branch, as Principal Paying Agent and The Bank of New York Mellon (Luxembourg) S.A., as Luxembourg Paying Agent, relating to the 6.250% Global Notes due 2026 (incorporated by reference to Exhibit 4.2 to Form 6-K of Petrobras and Petrobras International Finance Company, furnished to the Securities and Exchange Commission on December 12, 2011 (File Nos. 001-15106 and 001-33121)).
2.55	Guaranty for the 6.250% Global Notes due 2026, dated as of December 12, 2011, between Petrobras and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 4.1 to Form 6-K of Petrobras and Petrobras International Finance Company, furnished to the Securities and Exchange Commission on December 12, 2011 (File Nos. 001-15106 and 001-33121)).

8

No. Description

2.56	Eleventh Supplemental Indenture, dated as of February 6, 2012, among Petrobras International Finance Company, Petrobras and The Bank of New York Mellon, as Trustee, relating to the 2.875% Global Notes due 2015 (incorporated by reference to Exhibit 4.8 to Form 6-K of Petrobras and Petrobras International Finance Company, furnished to the Securities and Exchange Commission on February 6, 2012 (File Nos. 001-15106 and 001-33121)).
2.57	Guaranty for the 2.875% Global Notes due 2015, dated as of February 6, 2012, between Petrobras and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 4.7 to Form 6-K of Petrobras and Petrobras International Finance Company, furnished to the Securities and Exchange Commission on February 6, 2012 (File Nos. 001-15106 and 001-33121)).
2.58	Twelfth Supplemental Indenture, dated as of February 6, 2012, among Petrobras International Finance Company, Petrobras and The Bank of New York Mellon, as Trustee, relating to the 3.500% Global Notes due 2017 (incorporated by reference to Exhibit 4.11 to Form 6-K of Petrobras and Petrobras International Finance Company, furnished to the Securities and Exchange Commission on February 6, 2012 (File Nos. 001-15106 and 001-33121)).
2.59	Guaranty for the 3.500% Global Notes due 2017, dated as of February 6, 2012, between Petrobras and The Bank of New York Mellon, as Trustee (incorporated by reference to Exhibit 4.10 to Form 6-K of Petrobras and Petrobras International Finance Company, furnished to the Securities and Exchange Commission on February 6, 2012 (File Nos. 001-15106 and 001-33121)).
2.60	Thirteenth Supplemental Indenture, dated as of February 10, 2012, among Petrobras International Finance Company, Petrobras and The Bank of New York Mellon, as Trustee.
2.61	Amendment No. 2, dated as of September 16, 2010, to the Amended and Restated Deposit Agreement, dated as of January 2, 2007, among Petrobras, JPMorgan Chase Bank, N.A., as depositary, and registered holders and beneficial owners from time to time of the ADSs, representing the common shares of Petrobras (incorporated by reference to Exhibit 99.A.3 of the Registration Statement of Petrobras and Petrobras International Finance Company on Form F-6 filed with the Securities and Exchange Commission on September 16, 2010 (File No. 333-169430)).
2.62	Amendment No. 2, dated as of September 16, 2010, to the Amended and Restated Deposit Agreement, dated as of January 2, 2007, among Petrobras, JPMorgan Chase Bank, N.A., as depositary, and registered holders and beneficial owners from time to time of the ADSs, representing the preferred shares of Petrobras (incorporated by reference to Exhibit 99.A.3 of the Registration Statement of Petrobras and Petrobras International Finance Company on Form F-6 filed with the Securities and Exchange Commission on September 16, 2010 (File No. 333-169429)).
2.63	Assignment Agreement, dated as of September 3, 2010, among Petrobras, the Brazilian federal government and the National Petroleum, Natural Gas and Biofuels Agency (incorporated by reference to Exhibit 2.47 to the Annual Report on Form 20-F of Petrobras and Petrobras International Finance Company, filed with the Securities and Exchange Commission on May 26, 2011 (File Nos. 001-15106 and 001-33121)).
	The amount of long-term debt securities of Petrobras authorized under any given instrument does not exceed 10% of its total assets on a consolidated basis. Petrobras hereby agrees to furnish to the SEC, upon its request, a copy of any instrument defining the rights of holders of its long-term debt or of its subsidiaries for which consolidated or unconsolidated financial statements are required to be filed.
4.1	Form of Concession Agreement for Exploration, Development and Production of crude oil and natural gas executed between Petrobras and the ANP (incorporated by reference to Exhibit 10.1 of Petrobras’ Registration Statement on Form F-1 filed with the Securities and Exchange Commission on July 14, 2000 (File No. 333-12298)).
4.2	Purchase and Sale Agreement of natural gas, executed between Petrobras and Yacimientos Petrolíferos Fiscales Bolivianos-YPFB (together with and English version) (incorporated by reference to Exhibit 10.2 to Petrobras’ Registration Statement on Form F-1 filed with the Securities and Exchange Commission on July 14, 2000 (File No. 333-12298)).
8.1	List of subsidiaries.
12.1	Petrobras’ Certifications Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
12.2	PifCo’s Certifications Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
13.1	Petrobras’ Certifications Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
13.2	PifCo’s Certifications Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
15.1	Consent letter of KPMG.
15.2	Consent letter of KPMG.
15.3	Consent letter of DeGolyer and MacNaughton.
16.1	Letter from KPMG Auditores Independentes.

9

No. Description

99.1 Third Party Reports of DeGolyer and MacNaughton.

10

SIGNATURES

Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the registrant hereby certifies that it meets all the requirements for filing on Form 20-F/A and has duly caused this annual report to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Rio de Janeiro, on July 9, 2012.

Petróleo Brasileiro S.A.—PETROBRAS

By:   /s/ Maria das Graças Silva Foster

Name: Maria das Graças Silva Foster

Title:   Chief Executive Officer

By:   /s/ Almir Guilherme Barbassa

Name: Almir Guilherme Barbassa

Title: Chief Financial Officer and Chief Investor

           Relations Officer

11

SIGNATURES

Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the registrant hereby certifies that it meets all the requirements for filing on Form 20-F/A and has duly caused this annual report to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Rio de Janeiro, on July 9, 2012.

Petrobras International Finance Company—PifCo

By:   /s/ Daniel Lima de Oliveira

Name: Daniel Lima de Oliveira

Title: Chairman and Chief Executive Officer

By:   /s/ Sérvio Túlio da Rosa Tinoco

Name: Sérvio Túlio da Rosa Tinoco

Title: Chief Financial Officer

12

EX-12.1

Exhibit 12.1

CERTIFICATION PURSUANT TO RULES 13a-14(a) AND 15d-14(a) AS ADOPTED

UNDER SECTION 302 OF THE SARBANES-OXLEY ACT

I, Maria das Graças Silva Foster, certify that:

1.           I have reviewed this annual report on Form 20-F/A of Petróleo Brasileiro S.A. – Petrobras.

2.           Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.

 Date:     July 9, 2012    /s/ Maria das Graças Silva Foster            Maria das Graças Silva Foster Chief Executive Officer

CERTIFICATION PURSUANT TO RULES 13a-14(a) AND 15d-14(a) AS ADOPTED

UNDER SECTION 302 OF THE SARBANES-OXLEY ACT

I, Almir Guilherme Barbassa, certify that:

1.           I have reviewed this annual report on Form 20-F/A of Petróleo Brasileiro S.A. – Petrobras.

2.           Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.

  Date:     July 9, 2012   /s/ Almir Guilherme Barbassa               Almir Guilherme Barbassa Chief Financial Officer and Chief Investor Relations Officer

EX-12.2

Exhibit 12.2

CERTIFICATION PURSUANT TO RULES 13a-14(a) AND 15d-14(a) AS ADOPTED

UNDER SECTION 302 OF THE SARBANES-OXLEY ACT

I, Daniel Lima de Oliveira, certify that:

1.           I have reviewed this annual report on Form 20-F/A of Petrobras International Finance Company – PifCo.

2.           Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.

                                                                                                                   

 Date:     July 9, 2012    /s/ Daniel Lima de Oliveira                      Daniel Lima de Oliveira Chairman and Chief Executive Officer

CERTIFICATION PURSUANT TO RULES 13a-14(a) AND 15d-14(a) AS ADOPTED

UNDER SECTION 302 OF THE SARBANES-OXLEY ACT

I, Sérvio Túlio da Rosa Tinoco, certify that:

1.           I have reviewed this annual report on Form 20-F/A of Petrobras International Finance Company – PifCo.

2.           Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.

                                                                                                                   

 Date:     July 9, 2012    /s/ Sérvio Túlio da Rosa Tinoco                 Sérvio Túlio da Rosa Tinoco Chief Financial Officer

EX-16.1

Exhibit 16.1

KPMG Auditores Independentes	Central Tel	55 (21) 3515-9400
Av. Almirante Barroso, 52 — 4º	Fax	55 (21) 3515-9000
20031-000 — Rio de Janeiro, RJ — Brasil	Internet	www.kpmg.com.br
Caixa Postal 2888
20001-970 — Rio de Janeiro, RJ — Brasil

Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C., USA

20549-7561

Ladies and Gentlemen:

Until the fiscal year ended December 31, 2011, we were the independent public accountants of Petróleo Brasileiro S.A.—Petrobras and Petrobras International Finance Company—PifCo (together, the “Companies”).  Pursuant to our report included in the Annual Report on Form 20-F of the Companies, as filed with the Securities and Exchange Commission on March 30, 2012, we audited the consolidated financial statements of  the Companies as of and for the years ended December 31, 2011 and 2010, in accordance with International Financial Reporting Standards (IFRS) as issued by the International Accounting Standards Board (IASB).  We also audited the Companies’ internal control over financial reporting as of December 31, 2011, based on criteria established in Internal Control – Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).  On January 19, 2012, we became aware, through the Companies’ market communication, that the Companies had  engaged other independent public accountants for the fiscal year ending December 31, 2012.

We have read Item 16F of Amendment No. 1 to the Annual Report on Form 20-F/A of the Companies and are in agreement with the statements contained in paragraphs one, two and three in the section “Change in Registrant’s Certifying Accountant”.

We have no basis to agree or disagree with the other statements of the registrant contained therein.

Yours truly,

/s/ KPMG Auditores Independentes

KPMG Auditores Independentes

Rio de Janeiro, Brazil

July 9, 2012