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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * Bloch Stephen M   2. Issuer Name and Ticker or Trading Symbol MARINUS PHARMACEUTICALS INC [MRNS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O CANAAN VII L.P., 285 RIVERSIDE AVENUE SUITE 250 3. Date of Earliest Transaction (Month/Day/Year) 06/10/2015 (Street) WESTPORT, CT 06880 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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 06/10/2015   M   3,000 A $ 1.04 3,000 D   Common Stock 06/10/2015   G(1) V 3,000 D $ 0 0 D   Common Stock               1,836,398 I See Footnote (2) (3) Common Stock               2,461,398 I See Footnote (2) (3)

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction 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 (Month/Day/Year)

7. Title and Amount of Underlying Securities (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

Stock option (right to buy)

$ 1.04

06/10/2015

M

3,000

(4)

06/09/2019

Common Stock

3,000

$ 0

12,515

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Bloch Stephen M C/O CANAAN VII L.P. 285 RIVERSIDE AVENUE SUITE 250 WESTPORT, CT 06880	X

Signatures

/s/ Jaime Slocum, Attorney-in-Fact		06/11/2015
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	This transaction represents a charitable donation of shares.
(2)	Shares held directly by Canaan VII L.P. (the "Canaan Fund"). Canaan Partners VII LLC ("Canaan VII" and together with the Canaan Fund, the "Canaan Entities") is the sole general partner of the Canaan Fund and each may be deemed to have sole voting, investment and dispositive power with respect to the shares held by the Canaan Fund. Canaan VII disclaims Section 16 beneficial ownership of the securities held by the Canaan Fund, except to the extent of any pecuniary interest therein. Stephen Bloch, a manager of Canaan VII, serves as the representative of the Canaan Entities on the Issuer's board of directors.
(3)	Dr. Bloch disclaims beneficial ownership over the securities owned by Canaan VII L.P., and this report shall not be deemed an admission that such reporting person is the beneficial owner of such shares, except to the extent of his pecuniary interest, if any, in the securities by virtue of the limited liability company interests he owns in Canaan Partners VII LLC, the general partner of Canaan VII L.P.
(4)	These options are currently exercisable and were granted by the issuer prior to Dr. Bloch becoming a manager of Canaan VII.

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