X0306 4 2020-04-22 0001293818 OPGEN INC OPGN,OPGNW 0001809183 Curetis N.V. in Liquidation MAX-EYTH-STRASSE 42 HOLZGERLINGEN 2M 71088 GERMANY true Common Stock 2020-04-22 4 S 0 42375 2.24 D 1669180 D Common Stock 2020-04-23 4 S 0 46612 2.17 D 1622568 D The reporting person effected multiple same-way open market sale transactions on the same day at different prices through a trade order executed by a broker-dealer. The reporting person reported on a single line all such transactions that occurred within a one dollar price range. The price reflects the weighted average sale price, and the range of prices for such transaction is $2.23 to $2.27. The reporting person hereby undertakes to provide upon request by the Securities Exchange Commission staff, the issuer, or a shareholder of the issuer, full information regarding the number of shares sold at each separate price. The reporting person effected multiple same-way open market sale transactions on the same day at different prices through a trade order executed by a broker-dealer. The reporting person reported on a single line all such transactions that occurred within a one dollar price range. The price reflects the weighted average sale price, and the range of prices for such transaction is $2.14 to $2.25. The reporting person hereby undertakes to provide upon request by the Securities Exchange Commission staff, the issuer, or a shareholder of the issuer, full information regarding the number of shares sold at each separate price. /s/ O. Schacht & J. Bacher 2020-04-24