----

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| Commission File Number 001-15106Petróleo Brasileiro S.A.—Petrobras(Exact name of registrant as specified in its charter) | Commission File Number: 001-33121Petrobras 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, 6520031-912 – Rio de Janeiro – RJBrazil(Address of principal executive offices)   Almir Guilherme Barbassa(55 21) 3224-2040 – barbassa@petrobras.com.brAvenida República do Chile, 65 – 23rd Floor20031-912 – Rio de Janeiro – RJBrazil(Name, telephone, e-mail and/or facsimile number and address of company contact person) | 4th Floor, Harbour Place103 South Church StreetP.O. Box 1034GT – BWIGeorge Town, Grand CaymanCayman Islands(Address of principal executive offices) Sérvio Túlio da Rosa Tinoco(55 21) 3224-1410 – ttinoco@petrobras.com.brAvenida República do Chile, 65 – 3rd Floor20031-912 – Rio de Janeiro – RJBrazil(Name, telephone, e-mail and/or facsimile number and address of company contact person) |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|                   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                                                                                                                                                                                                                     |
|                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                        |

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| 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 3⁄4% 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)).                                           |

----

| 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)).                                                                                                                                                                                                                                                                                                                               |

----

| 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)).                                                                                                                                                 |

----

| 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)).                                                                                                                                                                                                                       |

----

| 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.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |

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| No. | Description |
|-----|-------------|

| 99.1 | Third Party Reports of DeGolyer and MacNaughton. |
|------|--------------------------------------------------|

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