FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Versant Ventures III, LLC 		2. Issuer Name and Ticker or Trading Symbol

OPGEN INC [ OPGN,OPGNW ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      __ X __ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

ONE SANSOME STREET, SUITE 3630 		3. Date of Earliest Transaction (MM/DD/YYYY)

5/8/2015
(Street)

SAN FRANCISCO, CA 94104
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

___ Form filed by One Reporting Person
_ X _ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock   5/8/2015     P    410906   A $6.00   483072   I   By Versant Venture Capital III, L.P.   (4)
Common Stock   5/8/2015     C    1153229   A   (1) 1636301   I   By Versant Venture Capital III, L.P.   (4)
Common Stock   5/8/2015     C    402348   A   (2) 2038649   I   By Versant Venture Capital III, L.P.   (4)
Common Stock   5/8/2015     C    500565   A   (3) 2539214   I   By Versant Venture Capital III, L.P.   (4)
Common Stock   5/8/2015     P    2426   A $6.00   2853   I   By Versant Side Fund III, L.P.   (4)
Common Stock   5/8/2015     C    6810   A   (1) 9663   I   By Versant Side Fund III, L.P.   (4)
Common Stock   5/8/2015     C    2377   A   (2) 12040   I   By Versant Side Fund III, L.P.   (4)
Common Stock   5/8/2015     C    2957   A   (3) 14997   I   By Versant Side Fund III, L.P.   (4)

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Series A Redeemable Convertible Preferred Stock     (1) 5/8/2015     C         1153229      (1)   (1) Common Stock   1153229   $0.00   0   I   By Versant Venture Capital III, L.P.   (4)
Series A Redeemable Convertible Preferred Stock     (1) 5/8/2015     C         6810      (1)   (1) Common Stock   6810   $0.00   0   I   By Versant Side Fund III, L.P.   (4)
2014 Convertible Notes     (2) 5/8/2015     C         402348      (2)   (2) Common Stock   402348   $0.00   0   I   By Versant Venture Capital III, L.P.  
2014 Convertible Notes     (2) 5/8/2015     C         2377      (2)   (2) Common Stock   2377   $0.00   0   I   By Versant Side Fund III, L.P.   (4)
2015 Convertible Notes     (3) 5/8/2015     C         500565      (3)   (3) Common Stock   500565   $0.00   0   I   By Versant Venture Capital III, L.P.   (4)
2015 Convertible Notes     (3) 5/8/2015     C         2957      (3)   (3) Common Stock   2957   $0.00   0   I   By Versant Side Fund III, L.P.  
Warrants   $6.60   5/8/2015     P      410906       5/8/2015   5/8/2020   Common Stock   410906   $0.00   410906   I   By Versant Venture Capital III, L.P.   (4)
Warrants   $6.60   5/8/2015     P      2426       5/8/2015   5/8/2020   Common Stock   2426   $0.00   2426   I   By Versant Side Fund III, L.P.  

Explanation of Responses:
( 1)  Series A Redeemable Convertible Preferred Stock automatically converted into common stock on a 1-to-1 basis upon the consummation of the Company's initial public offering.
( 2)  The 2014 Convertible Notes automatically converted into shares of Series A Preferred Stock upon the consummation of the Company's initial public offering at a conversion rate of one share of Series A Preferred Stock for every $1.00 of principal converted. Each share of Series A Preferred Stock automatically converted into one share of common stock upon the consummation of the Company's initial public offering.
( 3)  The 2015 Convertible Notes converted into Series A Preferred Stock upon the consummation of the Company's initial public offering at a conversion rate of 1.25 shares of Series A Preferred Stock for each $1.00 of principal converted. Each share of Series A Preferred stock automatically converted into one share of common stock upon the consummation of the Company's initial public offering.
( 4)  Versant Ventures III, LLC is the sole general partner of Versant Venture Capital III, L.P. and Versant Side Fund III, L.P. and has voting and dispositive power with respect to these shares. The individual managing members of Versant Ventures III, LLC are Brian G. Atwood, Bradley J. Bolzon, Samuel D. Colella, Ross A. Jaffe, William J. Link, Barbara N. Lubash, Donald B. Milder, Rebecca B. Robertson, Robin L. Praeger and Charles M. Warden (collectively, the "Managing Members"), all of whom share voting and investment power with respect to these shares. Each individual Managing Member disclaims beneficial ownership of these shares, except to the extent of their pecuniary interest in such shares.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Versant Ventures III, LLC
ONE SANSOME STREET
SUITE 3630
SAN FRANCISCO, CA 94104
X

Versant Venture Capital III, L.P.
ONE SANSOME STREET
SUITE 3630
SAN FRANCISCO, CA 94104
X

Versant Side Fund III, L.P.
ONE SANSOME STREET
SUITE 3630
SAN FRANCISCO, CA 94104
X


Signatures
/s/ Timothy C. Dec, Attorney-in-Fact 5/12/2015
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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