X0206 3 2022-04-11 0 0001092662 CHEMBIO DIAGNOSTICS, INC. CEMI 0001923974 Caso Charles C/O CHEMBIO DIAGNOSTICS, INC. 555 WIRELESS BOULEVARD HAUPPAUGE NY 11788 true See remarks Common Stock 7885 D Restricted stock units Common Stock 8203 D Restricted stock units Common Stock 15771 D Incentive stock options 4.65 2031-03-14 Common Stock 65476 D The restricted stock units are scheduled to vest on June 1 of each of 2022 and 2023, subject to continued service through each vesting date. Each restricted stock units represents a contingent right to receive one share of common stock. The restricted stock units are scheduled to vest on March 15 of each of 2022, 2023 and 2024, subject to continued service through each vesting date. The incentive stock options are scheduled to vest in four equal installments on March 15 of each of 2022, 2023, 2024 and 2025, subject to continued service through each vesting date. Senior Vice President, Global Commercial Operations Exhibit List: Exhibit 24 - Power of Attorney /s/ Mark L. Johnson, Attorney-in-Fact for Charles Caso 2022-04-27