OpGen shareholders reject say-on-pay; directors elected despite majority withheld votes

1. Proposal 1 - Election of Directors . The election of the following named persons to serve as directors of the Company until the 2024 Annual Meeting of Stockholders or until their successors are elected and qualified. The votes cast were as follows: Nominee For Vote Withheld Broker Non-Votes William E. Rhodes, III 243,133 382,016 1,343,051 Mario Crovetto 250,803 374,346 1,343,051 R. Donald Elsey 247,334 377,815 1,343,051 Prabhavathi Fernandes, Ph.D. 247,589 377,560 1,343,051 Oliver Schacht, Ph.D. 222,773 402,376 1,343,051 Yvonne Schlaeppi 293,577 331,572 1,343,051

3. Proposal 3 - Ratification of Independent Accounting Firm . The Company’s stockholders ratified the appointment of UHY LLP as the Company's independent registered public accounting firm for the fiscal year ending December 31, 2023, based on the following voting results: 1,347,326 votes FOR the proposal 337,259 votes AGAINST the proposal 283,615 votes ABSTAIN 0 votes Broker Non-Votes

2. Proposal 2 - Advisory Vote on Executive Compensation (Say on Pay) . On a non-binding advisory basis, the Company's stockholders did not approve the compensation of the Company's named executive officers for 2022, based on the following voting results: 190,077 votes FOR the proposal 420,856 votes AGAINST the proposal 14,216 votes ABSTAIN 1,343,051 votes Broker Non-Votes