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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1. Name and Address of Reporting Person * Spring Mountain Capital, LLC   2. Issuer Name and Ticker or Trading Symbol AMERICAN POWER GROUP Corp [APGI] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O SPRING MOUNTAIN CAPITAL, 65 EAST 55TH STREET, 33RD FLOOR 3. Date of Earliest Transaction (Month/Day/Year) 04/06/2016 (Street) NEW YORK, NY 10022 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) ___ Form filed by One Reporting Person _X_ 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 04/06/2016   J(1)   246,548 A $ 0.1352 1,542,832 D (1)   Common Stock 04/06/2016   J(2)(3)   739,644 A $ 0.1352 2,909,486 I See Footnotes (2) (3) Common Stock 04/06/2016   J(4)   860,453 A $ 0.1352 3,665,872 I See Footnote (4) Common Stock 04/06/2016   J(5)   120,809 A $ 0.1352 756,386 I See Footnote (5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Spring Mountain Capital, LLC C/O SPRING MOUNTAIN CAPITAL 65 EAST 55TH STREET, 33RD FLOOR NEW YORK, NY 10022	X	X
SMC Select Co-Investment Fund I LP C/O SPRING MOUNTAIN CAPITAL 65 EAST 55TH STREET, 33RD FLOOR NEW YORK, NY 10022	X	X
SMC Select Co-Investment I GP, LLC C/O SPRING MOUNTAIN CAPITAL 65 EAST 55TH STREET, 33RD FLOOR NEW YORK, NY 10022	X	X
Spring Mountain Capital G.P., LLC C/O SPRING MOUNTAIN CAPITAL 65 EAST 55TH STREET, 33RD FLOOR NEW YORK, NY 10022	X	X
Spring Mountain Capital, LP C/O SPRING MOUNTAIN CAPITAL 65 EAST 55TH STREET, 33RD FLOOR NEW YORK, NY 10022	X	X
SMC Employees Partnership C/O SPRING MOUNTAIN CAPITAL 65 EAST 55TH STREET, 33RD FLOOR NEW YORK, NY 10022	X	X
Steffens John C/O SPRING MOUNTAIN CAPITAL 65 EAST 55TH STREET, 33RD FLOOR NEW YORK, NY 10022	X	X
Ho Gregory P. C/O SPRING MOUNTAIN CAPITAL 65 EAST 55TH STREET, 33RD FLOOR NEW YORK, NY 10022	X	X

Signatures

SPRING MOUNTAIN CAPITAL, LLC, By: /s/ Gregory P. Ho, Managing Member		04/14/2016
**Signature of Reporting Person		Date
SMC SELECT CO-INVESTMENT FUND I, LP, By: SMC Select Co-Investment I GP, LLC, General Partner, By: Spring Mountain Capital G.P., LLC, Member, /s/ Gregory P. Ho, Managing Member		04/14/2016
**Signature of Reporting Person		Date
SMC SELECT CO-INVESTMENT I GP, LLC, By: Spring Mountain Capital G.P., LLC, Member, /s/ Gregory P. Ho, Managing Member		04/14/2016
**Signature of Reporting Person		Date
SPRING MOUNTAIN CAPITAL G.P., LLC, By: /s/ Gregory P. Ho, Managing Member		04/14/2016
**Signature of Reporting Person		Date
SPRING MOUNTAIN CAPITAL, LP, By: Spring Mountain Capital, LLC, General Partner, /s/ Gregory P. Ho, Managing Member		04/14/2016
**Signature of Reporting Person		Date
SMC EMPLOYEES PARTNERSHIP, By: /s/ Gregory P. Ho, Authorized Signatory		04/14/2016
**Signature of Reporting Person		Date
/s/ John L. Steffens		04/14/2016
**Signature of Reporting Person		Date
/s/ Gregory P. Ho		04/14/2016
**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)	SMC Select Co-Investment Fund I, LP ("SMC Co-Investment") received 246,548 shares of the Issuer's common stock as a payment-in-kind dividend on 133.33 shares of the Issuer's 10% Convertible Preferred Stock ("Preferred Stock") owned at the time of the dividend payment date. SMC Select Co-Investment I GP, LLC is the general partner of SMC Co-Investment ("SMC Co-Investment GP") and pursuant to Rule 16a-1 of the Securities Exchange Act of 1934, as amended, it may be deemed to be the beneficial owner of any securities reported herein that are beneficially owned by SMC Co-Investment. SMC Co-Investment GP disclaims beneficial ownership with respect to any shares of common stock except to the extent of its pecuniary interest therein.
(2)	Spring Mountain Capital G.P., LLC ("Spring Mountain GP") is the general partner to SMC Reserve Fund II, LP ("SMC Reserve II") and SMC Reserve Fund II Offshore, LP ("SMC Reserve II Offshore"), neither of which is a reporting person, and is the sole member of SMC Co-Investment GP. Entities over which Spring Mountain GP is deemed to have voting and investment control received 739,644 shares of the Issuer's common stock as a payment-in-kind dividend on 399.99 shares of the Issuer's Preferred Stock owned at the time of the dividend payment date. Spring Mountain Capital, LP ("SMC LP") acts as investment manager to SMC Reserve II, SMC Reserve II Offshore and SMC Co-Investment. Spring Mountain Capital, LLC ("SMC LLC") is the general partner of SMC LP.
(3)	Pursuant to Rule 16a-1 of the Securities Exchange Act of 1934, as amended, each of Spring Mountain GP, SMC LP and SMC LLC may be deemed to be the beneficial owner of any securities reported herein that are beneficially owned by SMC Reserve II, SMC Reserve II Offshore and SMC Co-Investment. Each of Spring Mountain GP, SMC LP and SMC LLC disclaims beneficial ownership with respect to any shares of common stock except to the extent of its pecuniary interest therein. Spring Mountain GP has the right to appoint two Directors of the Issuer and currently, Raymond Wong and Jamie Weston, employees of SMC LP, have been appointed as Directors of the Issuer. The reporting persons may be deemed to be Directors by deputization by reason of Mr. Wong and Mr. Weston, and any successor appointees, serving as Directors of the Issuer.
(4)	Mr. John L. Steffens and Mr. Gregory P. Ho are managing members of Spring Mountain GP and SMC LLC, and are also partners in SMC Employees Partnership ("SMC EP"). Entities over which Mr. Steffens and Mr. Ho are deemed to have voting and investment control received an aggregate of 860,453 shares of the Issuer's common stock as a payment-in-kind dividend on 465.32 shares of the Issuer's Preferred Stock owned at the time of the dividend payment date. Pursuant to Rule 16a-1 of the Securities Exchange Act of 1934, as amended, each of Mr. Steffens and Mr. Ho may be deemed to be the beneficial owner of any securities reported herein that may be deemed to be beneficially owned by SMC Reserve II, SMC Reserve II Offshore, SMC Co-Investment and SMC EP. Each of Mr. Steffens and Mr. Ho disclaims beneficial ownership with respect to any shares of common stock except to the extent of his pecuniary interest therein.
(5)	SMC EP received 120,809 shares of the Issuer's common stock as a payment-in-kind dividend on 65.33 shares of the Issuer's Preferred Stock owned at the time of the dividend payment date.

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