X0306 4 2021-09-30 0 0001437352 EVERBRIDGE, INC. EVBG 0001213211 IRVIN VERNON C/O EVERBRIDGE, INC. 25 CORPORATE DRIVE BURLINGTON MA 02108 0 1 0 0 EVP, Chief Revenue Officer Common Stock 2021-09-30 4 M 0 12500 A 12776 D Common Stock 2021-10-01 4 S 0 12500 150.0558 D 276 D Restricted Stock Unit 0.00 2021-09-30 4 M 0 12500 0.00 D Common Stock 12500 25000 D Restricted stock units convert into common stock on a one-for-one basis. Includes 109 shares of common stock acquired pursuant to the Everbridge, Inc. 2016 Employee Stock Purchase Plan. On October 24, 2019, the reporting person was granted restricted stock units (RSUs) which vest annually in four equal installments. Not applicable. /s/ Elliot J. Mark, Attorney-in-Fact 2021-10-04