X0508 4 2023-08-31 0 0001437352 EVERBRIDGE, INC. EVBG 0001770750 Brickley Patrick C/O EVERBRIDGE, INC. 25 CORPORATE DRIVE BURLINGTON MA 01803 0 1 0 0 EVP and CFO 0 Common Stock 2023-08-31 4 M 0 2253 A 109088 D Common Stock 2023-09-01 4 S 0 992 25.065 D 108096 D Restricted Stock Unit 2023-08-31 4 M 0 2253 0.00 D Common Stock 2253 22529 D Each restricted stock unit represents the contingent right to receive one share of Everbridge common stock. Represents the number of shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of RSUs. On February 15, 2023, the reporting person was granted restricted stock units (RSUs). A portion of the RSUs vested on August 31, 2023. The remaining RSUs will vest in equal installments over twelve calendar quarters, provided, however, as long as the reporting person remains in the service of Everbridge through the respective vesting date. Not applicable. /s/ Noah F. Webster, Attorney-in-Fact 2023-09-01