Corbus appoints Brent Pfeiffenberger to board; shareholders approve 3M share increase for equity plan

On May 13, 2026, the board of directors (the “Board”) of Corbus Pharmaceuticals Holdings, Inc. (the “Company”), upon the recommendation of the Nominating and Corporate Governance Committee of the Board, appointed Brent Pfeiffenberger, age 48, to serve as a member of the Board, thereby expanding the Board to seven members.

The votes were cast as follows with respect to the proposal to vote, on an advisory basis, on whether an advisory vote on executive compensation should occur every year, two years or three years. In accordance with the votes, an advisory vote to approve executive compensation will occur every year until the next required vote on the frequency of future advisory votes to approve executive compensation, or until the Company otherwise determines that a different frequency for such advisory votes is in the best interest of the Company: Every Year Every Two Years Every Three Years Abstentions 9,712,048 151,354 198,373 12,295

The proposal to vote, on an advisory basis, on the compensation of the Company’s named executive officers as described in the Company’s definitive proxy statement was approved based upon the following votes: Votes For Votes Against Abstentions Broker Non-Votes 9,325,932 721,442 26,696 4,060,300

The proposal to approve the 2024 Plan Amendment, was approved based on the following votes: Votes For Votes Against Abstentions Broker Non-Votes 5,950,038 4,099,773 24,259 4,060,300

The election of each of Yuval Cohen, Rachelle Jacques, John Jenkins, Anne Altmeyer, Yong Ben, and Winston Kung as directors to hold office for a term of one year, until his or her successor is duly elected and qualified or he or she is otherwise unable to complete his or her term. The votes were cast for this matter as follows: Nominees Votes For Votes Withheld Broker Non-Votes Yuval Cohen 9,986,956 87,114 4,060,300 Rachelle Jacques 9,647,139 426,931 4,060,300 John Jenkins 9,636,703 437,367 4,060,300 Anne Altmeyer 9,621,769 452,301 4,060,300 Yong Ben 9,988,459 85,611 4,060,300 Winston Kung 9,979,901 94,169 4,060,300

The proposal to ratify the appointment of EisnerAmper LLP as the Company’s independent registered public accounting firm for the Company’s fiscal year ending December 31, 2026, was approved based upon the following votes: Votes For Votes Against Abstentions 14,102,264 14,731 17,375