X0306 4 2019-12-13 0 0001478069 CONTRAFECT Corp CFRX 0001615047 Low David N. 4 EMBARCADERO CENTER SUITE 650 SAN FRANCISCO CA 94111 1 0 0 0 Common Stock, par value $0.0001 per share 2019-12-13 2019-12-13 4 P 0 300000 0.43 A 370550 D The purchase reported in this Form 4 was made on the open market. The price reported is a weighted average price based on the shares purchased in multiple transactions. The reporting person undertakes to provide Issuer, any security holder of Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares purchased at each price comprising the average set forth herein. /s/ Nancy Dong as attorney-in-fact for David N. Low 2019-12-16