X0407 4 2023-04-13 0 0001092662 CHEMBIO DIAGNOSTICS, INC. CEMI 0001877081 Perceptive Credit Advisors, LLC 51 ASTOR PLACE, 10TH FLOOR NEW YORK NY 10003 0 0 1 0 0001224962 PERCEPTIVE ADVISORS LLC 51 ASTOR PLACE, 10TH FLOOR NEW YORK NY 10003 0 0 1 0 0001164426 EDELMAN JOSEPH 51 ASTOR PLACE, 10TH FLOOR NEW YORK NY 10003 0 0 1 0 0 Common Stock 2023-04-13 4 P 0 140134 0.45 A 4694234 I See footnote Common Stock 2023-04-14 4 P 0 11500 0.45 A 4705734 I See footnote Common Stock 2023-04-17 4 P 0 4800 0.45 A 4710534 I See footnote The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $0.446 to $0.448, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges of the prices reported. The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $0.4472 to $0.448, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges of the prices reported. The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $0.4479 to $0.448, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges of the prices reported. The securities are directly held by Perceptive Credit Holdings II, L.P. (the "Credit Fund"). Perceptive Credit Opportunities GP, LLC is the general partner of the Credit Fund, and Perceptive Credit Advisors LLC ("Credit Advisor") serves as the investment manager of the Credit Fund and as a relying advisor under Perceptive Advisors LLC (the "Advisor"). Joseph Edelman is the managing member of Credit Advisor and the Advisor. The Credit Advisor, the Advisor, and Mr. Edelman disclaim, for purposes of Section 16 of the Securities Exchange Act of 1934, beneficial ownership of such securities, except to the extent of its or his indirect pecuniary interest therein, and this report shall not be deemed an admission that the Credit Advisor or Mr. Edelman is the beneficial owner of such securities for purposes of Section 16 or for any other purposes. /s/ Joseph Edelman for Perceptive Credit Advisors LLC, By: Joseph Edelman, its managing member 2023-04-17 /s/ Perceptive Advisors LLC, By: Joseph Edelman, its managing member 2023-04-17 /s/ Joseph Edelman 2023-04-17