SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* KINDERHOOK CAPITAL MANAGEMENT, LLC (Last) (First) (Middle) 2 EXECUTIVE DRIVE SUITE 585 (Street) FORT LEE NJ 07024 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 03/07/2012	3. Issuer Name and Ticker or Trading Symbol ACTIVE POWER INC [ ACPW ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)	5. If Amendment, Date of 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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	17,632,985	D(1)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Kinderhook Capital Management, LLC serves as the investment adviser to Kinderhook Partners, LP (the "Partnership"), which is the registered owner of the shares of Common Stock. As the Partnership's investment adviser, Kinderhook Capital Management, LLC has the discretionary authority to invest and dispose of the Partnership's assets and to vote the Partnership's securities. Accordingly, Kinderhook Capital Management, LLC may be deemed to have a beneficial interest in the shares of Common Stock. Kinderhook Capital Management, LLC specifically disclaims beneficial ownership in the shares of Common Stock reported herein except to the extent of its pecuniary interest, if any, therein.

	/s/ Tushar Shah, Managing Member	03/08/2012
	** 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 5 (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).
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