X0306 4 2019-08-30 0 0001437352 EVERBRIDGE, INC. EVBG 0001605965 Mark Elliot J. C/O EVERBRIDGE, INC. 25 CORPORATE DRIVE BURLINGTON MA 01803 0 1 0 0 SVP & General Counsel Common Stock 2019-08-31 4 M 0 1394 A 11018 D Common Stock 2019-09-03 4 S 0 1394 86.20 D 9624 D Common Stock 2019-09-03 4 S 0 3500 86.5456 D 9624 D Restricted Stock Unit 0.00 2019-08-30 4 A 0 2558 0.00 A Common Stock 2558 2558 D Performance-based Restricted Stock Unit 0.00 2019-08-30 4 A 0 2558 0.00 A 2022-11-15 Common Stock 2558 2558 D Restricted Stock Unit 0.00 2019-09-03 4 M 0 1394 0.00 D Common Stock 1394 2831 D Employee Stock Option (Right to Buy) 14.6625 2019-09-03 4 M 0 3500 0.00 D 2026-01-06 Common Stock 3500 4413 D Restricted stock units convert into common stock on a one-for-one basis. The sales reported were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person. Represents a grant of restricted stock units under the Everbridge, Inc. 2016 Equity Incentive Plan. Each restricted stock unit represents the contingent right to receive, upon vesting of the unit, one share of Everbridge common stock. Subject to accelerated vesting in certain circumstances, the restricted stock units are scheduled to vest 33% on August 31, 2020, 33% on August 31, 2021, and 34% on August 31, 2022, as long as the reporting person remains in the service of Everbridge through the respective vesting date. Not applicable Represents a grant of performance-based restricted stock units ("PSU") under the Everbridge, Inc. 2016 Equity Incentive Plan. Each PSU represents the contingent right to receive, upon vesting of the unit, one share of Everbridge common stock. Up to sixty-two and one-half percent (62.5%) of the PSUs will become eligible to vest at the end of the fiscal quarter after the second anniversary of the grant date based on the compound annual growth rate ("CAGR") achieved during the eight fiscal quarters preceding the then most recent fiscal quarter, and up to an additional sixty-two and one-half percent (62.5%) of the PSUs will become eligible to vest at the end of the fiscal quarter after the third anniversary of the grant date based on the CAGR achieved during the 12 fiscal quarters preceding the then most recent fiscal quarter. On August 22, 2018, the reporting person was granted restricted stock units (RSUs). The RSUs vested on August 31, 2019. 25% of the shares originally subject to the Stock Option will vest and become exercisable on November 16, 2016, and the remaining shares vest in 12 equal quarterly installments thereafter. Elliot J. Mark 2019-09-04