X0306 4 2018-05-16 0001092662 CHEMBIO DIAGNOSTICS, INC. CEMI 0001577880 Klugewicz Sharon W 3661 HORSEBLOCK ROAD MEDFORD NY 11763 true President, Americas Common Stock 2018-05-16 4 M 0 5000 4.5 A 21448 D Common Stock 2018-05-16 4 F 0 2737 D 18711 D Options to purchase common stock 4.5 2018-05-16 4 M 0 2500 0 D 2014-05-22 2018-05-22 Common Stock 2500 0 D Options to purchase common stock 4.5 2018-05-16 4 M 0 2500 0 D 2015-05-22 2018-05-22 Common Stock 2500 0 D The reporting person did not sell any shares of common stock. Rather, the reporting person exercised options to acquire 2,263 shares of common stock by submitting and relinquishing to the issuer options to purchase an additional 2,737 shares of common stock. These additional options to purchase 2,737 shares of common stock constituted the entire exercise price, using the 10-day volume weighted average trading price ended May 15, 2018 of $8.2216. As a result of this transaction, the reporting person increased her stock ownership by 2,263 shares of common stock and reduced the number of options owned by 5,000 (2,263 options exercised plus 2,737 options used to pay the exercise price for the 2,263 options exercised to purchase the 2,263 shares of common stock). /s/ Sharon Klugewicz 2018-05-18