X0306 4 2020-10-13 0 0001512673 Square, Inc. SQ 0001658470 Henry Alyssa 1455 MARKET STREET SUITE 600 SAN FRANCISCO CA 94103 0 1 0 0 Seller Lead Class A Common Stock 2020-10-13 4 M 0 10000 17.20 A 423665 D Class A Common Stock 2020-10-13 4 S 0 500 186.88 D 423165 D Class A Common Stock 2020-10-13 4 S 0 713 188.20 D 422452 D Class A Common Stock 2020-10-13 4 S 0 2191 189.68 D 420261 D Class A Common Stock 2020-10-13 4 S 0 6396 190.50 D 413865 D Class A Common Stock 2020-10-13 4 S 0 200 191.18 D 413665 D Stock Option (right to buy) 17.20 2020-10-13 4 M 0 10000 0.00 D 2027-04-18 Class A Common Stock 10000 115683 D The option exercise and sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $186.33 to $187.20 per share. 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 sale price. These shares were sold in multiple transactions at prices ranging from $187.79 to $188.70 per share. 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 sale price. These shares were sold in multiple transactions at prices ranging from $189.05 to $189.99 per share. 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 sale price. These shares were sold in multiple transactions at prices ranging from $190.09 to $190.88 per share. 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 sale price. These shares were sold in multiple transactions at prices ranging from $191.17 to $191.18 per share. 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. 1/48 of the shares subject to the option vest on May 1, 2017, and 1/48 of the shares vest monthly thereafter. /s/ Susan Szotek, Attorney-in-Fact 2020-10-15