OpGen Inc. Watch

from 8-K 14 pages Common Stock Purchase Warrant Opgen, Inc

from 8-K 16 pages Common Stock Purchase Warrant Opgen, Inc

from 8-K 15 pages Prefunded Common Stock Purchase Warrant Opgen, Inc

from S-1/A 19 pages Common Stock Purchase Warrant Opgen, Inc

from S-1/A 18 pages Prefunded Common Stock Purchase Warrant Opgen, Inc

from 10-K 3 pages Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

from S-1/A 15 pages Series [A-1] [A-2] Common Stock Purchase Warrant Opgen, Inc

from S-1/A 15 pages Prefunded Common Stock Purchase Warrant Opgen, Inc

from 8-K 16 pages Form of Pre-Funded Common Stock Purchase Warrant Opgen, Inc

from 8-K 14 pages Form of Common Stock Purchase Warrant Opgen, Inc

from 10-K 3 pages Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

from 8-K 18 pages Common Stock Purchase Warrant Opgen, Inc

from 10-K 4 pages Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

from 8-K 15 pages Common Stock Purchase Warrant Opgen, Inc

from 8-K 15 pages Common Stock Purchase Warrant Opgen, Inc

from 8-K 14 pages Pre-Funded Common Stock Purchase Warrant Opgen, Inc

from 8-K 15 pages Pre-Funded Common Stock Purchase Warrant Opgen, Inc

from 8-K 14 pages Common Stock Purchase Warrant Opgen, Inc

from 10-K 5 pages Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

from 10-K 1 page Number Op Shares Specimen Opgen, Inc. Incorporated Under the Laws of the State of Deleware See Reverse for Certain Definitions Common Stock Cusip 68373l 20 8 This Certifies That: Specimen – Not Negotiable Is the Owner of Fully Paid and Non-Assessable Shares of Common Stock of $.01 Par Value Each of Opgen, Inc. Transferable on the Books of the Corporation in Person or by Duly Authorized Attorney Upon Surrender of This Certificate Duly Endorsed or Assigned. This Certificate and the Shares Represented Hereby Are Subject to the Laws of the State of Delaware, and to the Certificate Incorporation and Bylaws of the Corporation, as Now or Hereafter Amended. This Certificate Is Not Valid Until Countersigned by the Transfer Agent. Witness the Facsimile Seal of the Corporation and the Facsimile Signatures of Its Duly Authorized Officers. Dated: Countersigned Philadelphia Stock Transfer. Inc 2320 Haverford Rd. Suite 230. Ardmore, Pa 19003 Transfer Agent Authorized Signature Corporate Seal 2001 Delaware Specimen Not Negotiable Chief Financial Officer CEO/President