X0306 4 2018-07-16 0 0001437352 EVERBRIDGE, INC. EVBG 0001291475 Hughes Robert W C/O EVERBRIDGE, INC. 25 CORPORATE DRIVE BURLINGTON MA 01803 0 1 0 0 President Restricted Stock Unit 0.00 2018-07-16 4 A 0 12500 0.00 A Common Stock 12500 12500 D Performance-based Restricted Stock Unit 0.00 2018-07-16 4 A 0 12500 0.00 A 2021-08-01 Common Stock 12500 12500 D Employee Stock Option (Right to Buy) 23.60 2018-07-16 4 D 0 375000 0.00 D 2027-07-31 Common Stock 375000 125000 D 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 July 31, 2019, 33% on July 31, 2020, and 34% on July 31, 2021, 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 on 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 on the third anniversary of the grant date based on the CAGR achieved during the 12 fiscal quarters preceding the then most recent fiscal quarter. Consists of stock options surrendered by the reporting person in connection with an amendment to his employment agreement with Everbridge. 25% of the shares originally subject to the Stock Option will vest and become exercisable on July 31, 2018, and the remaining shares vest in 12 equal quarterly installments thereafter. Elliot J. Mark, Attorney-in-Fact 2018-07-18