X0306 4 2019-05-01 0001418091 TWITTER, INC. TWTR 0001733051 Derella Matthew C/O TWITTER, INC. 1355 MARKET STREET, SUITE 900 SAN FRANCISCO CA 94103 1 VP, Revenue & Partnerships Common Stock 2019-05-01 4 F 0 20569 39.91 D 539537 D Common Stock 2019-05-03 4 S 0 18002 40.356 D 521535 D The shares reported as disposed of were withheld by the Issuer in order to cover withholding taxes in connection with the vesting of restricted stock units, or RSUs. These shares were not issued to or sold by the Reporting Person. Of the reported shares 509,485 shares are represented by RSUs. The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $39.98 to $40.59 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. /s/ Sean Edgett, Attorney-in-Fact 2019-05-03