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 *

ORBIMED ADVISORS LLC 		2. Issuer Name and Ticker or Trading Symbol

Roka BioScience, Inc. [ ROKA ] 		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)

601 LEXINGTON AVENUE, 54TH FLOOR 		3. Date of Earliest Transaction (MM/DD/YYYY)

10/3/2017
(Street)

NEW YORK, NY 10022
(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, par value $0.001 per share   10/3/2017     S    199718   D $0.68   (1) 0   I   See Footnotes   (2) (3) (5)
Common Stock, par value $0.001 per share   10/3/2017     S    1899   D $0.68   (1) 0   I   See Footnotes   (4) (5)

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

Explanation of Responses:
(1)  The price reported in Column 4 is a weighted average price. These shares of the Issuer's common stock ("Shares") were sold in multiple transactions at prices ranging from $0.66 to $0.71 inclusive. Upon request, the Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the Securities and Exchange Commission (the "SEC") full information regarding the Shares sold at each separate price within the range set forth in this footnote.
(2)  These securities are held of record by OrbiMed Private Investments III, LP ("OPI III") and may be deemed to be indirectly beneficially owned by OrbiMed Capital GP III LLC ("GP III"), OrbiMed Advisors LLC ("Advisors") and Samuel D. Isaly ("Isaly"). GP III is the sole general partner of OPI III. Advisors, a registered adviser under the Investment Advisers Act of 1940, as amended, is the sole managing member of GP III. By virtue of such relationships, GP III and Advisors may be deemed to have voting and investment power with respect to the securities held by OPI III noted above.
(3)  Isaly, a natural person, may also be deemed to have voting and investment power with respect to the securities held by OPI III noted above in his capacity as the managing member of, and holder of a controlling interest, in Advisors. As a result, each of GP III, Advisors and Isaly may be deemed to have beneficial ownership of the securities held by OPI III.
(4)  These securities are held of record by OrbiMed Associates III, LP ("Associates III") and may be deemed to be indirectly beneficially owned by Advisors and Isaly. Advisors is the sole general partner of Associates III. Isaly is the managing member of, and holder of a controlling interest in, Advisors. By virtue of such relationship, Advisors and Isaly may be deemed to have voting and investment power with respect to the securities held by Associates III noted above. As a result, each of Advisors and Isaly may be deemed to have beneficial ownership of the securities held by Associates III.
(5)  This report on Form 4 is jointly filed by GP III, Advisors and Isaly. Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of its or his pecuniary interest therein, if any. This report shall not be deemed an admission that the Reporting Persons are beneficial owners for the purpose of Section 16 of the Exchange Act, or for any other purpose.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
ORBIMED ADVISORS LLC
601 LEXINGTON AVENUE, 54TH FLOOR
NEW YORK, NY 10022
X

OrbiMed Capital GP III LLC
601 LEXINGTON AVENUE, 54TH FLOOR
NEW YORK, NY 10022
X

ISALY SAMUEL D
601 LEXINGTON AVENUE, 54TH FLOOR
NEW YORK, NY 10022
X


Signatures
/s/ Samuel D. Isaly 10/5/2017
** 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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