X0306 4 2021-05-10 0 0001437352 EVERBRIDGE, INC. EVBG 0001770750 Brickley Patrick C/O EVERBRIDGE, INC. 25 CORPORATE DRIVE BURLINGTON MA 01803 0 1 0 0 SVP, Chief Financial Officer Common Stock 2021-05-10 4 M 0 31250 A 31880 D Common Stock 2021-05-11 4 S 0 13548 112.901 D 18332 D Performance-based Restricted Stock Unit 0.00 2021-05-10 4 M 0 31250 0.00 D Common Stock 31250 31250 D Performance-based restricted stock units (PSUs) convert into common stock on a one-for-one basis. Represents the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person. On January 1, 2019, the reporting person was granted performance-based restricted stock units (PSUs). The PSUs vested as to 50% on May 10, 2021. Not applicable. /s/ Elliot J. Mark, Attorney-in-Fact 2021-05-12