X0306 4 2017-02-21 0001326801 Facebook Inc FB 0001621141 Koum Jan C/O FACEBOOK, INC. 1601 WILLOW ROAD MENLO PARK CA 94025 1 Class A Common Stock 2017-02-21 4 S 0 149978 133.3527 D 2092365 I By Jan Koum and BNY Mellon Trust of Delaware, Co-Trustees of The Jan Koum Trust IV U/A/D 2/4/2015 Class A Common Stock 2017-02-21 4 S 0 595284 133.3566 D 13200505 I By Jan Koum, Trustee of The Butterfly Trust U/A/D 1/20/2004 Class A Common Stock 3500000 I By Jan Koum and BNY Mellon Trust of Delaware Co-Trustees of The Jan Koum Trust VIII U/A/D 1/29/2016 Class A Common Stock 2370448 I By Jan Koum and BNY Mellon Trust of Delaware, Co-Trustees of The Jan Koum Trust V U/A/D 4/29/2015 Class A Common Stock 2236923 I By Jan Koum and BNY Mellon Trust of Delaware, Co-Trustees of The Jan Koum Trust VI U/A/D 8/5/2015 Class A Common Stock 2060265 I By Jan Koum and BNY Mellon Trust of Delaware, Co-Trustees of The Jan Koum Trust VII U/A/D 10/20/2015 Class A Common Stock 1314746 I By Jan Koum, Trustee of The Jan Koum Family Trust U/A/D 4/29/2014 Class A Common Stock 3500000 I By Jan Koum and BNY Mellon Trust of Delaware, Co-Trustees of The Jan Koum Trust IX U/A/D 4/13/2016 The sales reported were effected by Jan Koum and BNY Mellon Trust of Delaware, Co-Trustees of The Jan Koum Trust IV U/A/D 2/4/2015 and Jan Koum, Trustee of The Butterfly Trust U/A/D 1/20/2004, as applicable, pursuant to their Rule 10b5-1trading plans. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $132.91 to $133.74 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. Shares held of record by Jan Koum and BNY Mellon Trust of Delaware, Co-Trustees of The Jan Koum Trust IV U/A/D 2/4/2015. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $132.91 to $133.84 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. Shares held of record by Jan Koum, Trustee of The Butterfly Trust U/A/D 1/20/2004. Shares held of record by Jan Koum and BNY Mellon Trust of Delaware, Co-Trustees of The Jan Koum Trust VIII U/A/D 1/29/2016. Shares held of record by Jan Koum and BNY Mellon Trust of Delaware, Co-Trustees of The Jan Koum Trust V U/A/D 4/29/2015. Shares held of record by Jan Koum and BNY Mellon Trust of Delaware, Co-Trustees of The Jan Koum Trust VI U/A/D 8/5/2015. Shares held of record by Jan Koum and BNY Mellon Trust of Delaware, Co-Trustees of The Jan Koum Trust VII U/A/D 10/20/2015. Shares held of record by Jan Koum, Trustee of The Jan Koum Family Trust U/A/D 4/29/2014. The reporting person exercises voting and dispositive powers over these shares, but has no pecuniary interest in these shares. Shares held of record by Jan Koum and BNY Mellon Trust of Delaware, Co-Trustees of The Jan Koum Trust IX U/A/D 4/13/2016. /s/ Michael Johnson as attorney-in-fact for Jan Koum 2017-02-23