X0306 4 2017-08-30 0001326801 Facebook Inc FB 0001621141 Koum Jan C/O FACEBOOK, INC. 1601 WILLOW ROAD MENLO PARK CA 94025 1 Class A Common Stock 2017-08-30 4 S 0 63629 170.0204 D 7078958 I By Jan Koum, Trustee of The Butterfly Trust U/A/D 1/20/2004 Class A Common Stock 2017-08-31 4 S 0 204534 170.7542 D 6874424 I By Jan Koum, Trustee of The Butterfly Trust U/A/D 1/20/2004 Class A Common Stock 2017-08-31 4 S 0 367363 171.6449 D 6507061 I By Jan Koum, Trustee of The Butterfly Trust U/A/D 1/20/2004 Class A Common Stock 2017-08-31 4 S 0 5228 172.0857 D 6501833 I By Jan Koum, Trustee of The Butterfly Trust U/A/D 1/20/2004 Class A Common Stock 3451985 I By BNY Mellon Trust of Delaware, Trustee of The Jan Koum Family Trust II U/A/D 2/4/2015 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 2103543 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 1314746 I By Jan Koum, Trustee of The Jan Koum Family Trust U/A/D 4/29/2014 Class A Common Stock 2242880 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 on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the holder. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $170.00 to $170.15 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. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $170.07 to $171.06 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. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $171.065 to $172.05 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. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $172.06 to $172.13 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 BNY Mellon Trust of Delaware, Trustee of The Jan Koum Family Trust II U/A/D 2/4/2015. 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 VII U/A/D 10/20/2015. 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, 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 2017-09-01