PLUG POWER INC — Major Shareholding Notification 2012

Jan 26, 2012

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G/A
Under the Securities Exchange Act of 1934
(Amendment No. 1)*
Plug Power Inc.
(Name of Issuer)
Common Stock, $0.01 par value
(Title of Class of Securities)
72919P202
(CUSIP Number)
December 31, 2011
(Date of event which requires filing of this statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
¨	Rule 13d-1(b)
x	Rule 13d-1(c)
¨	Rule 13d-1(d)
(Page 1 of 7 Pages)

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*The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 72919P202 13G/A Page 2 of 7 Pages

1	NAMES OF REPORTING PERSONS Empery Asset Management, LP
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP	(a) ¨ (b) x
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	5	SOLE VOTING POWER 0
	6	SHARED VOTING POWER 423,440 shares of Common Stock Warrants to purchase 1,241,250 shares of Common Stock (see Item 4)*
	7	SOLE DISPOSITIVE POWER 0
	8	SHARED DISPOSITIVE POWER 423,440 shares of Common Stock Warrants to purchase 1,241,250 shares of Common Stock (see Item 4)*
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 423,440 shares of Common Stock Warrants to purchase 1,241,250 shares of Common Stock (see Item 4)*
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES	¨
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 4.99% (see Item 4)
12	TYPE OF REPORTING PERSON PN

• As more fully described in Item 4, these reported securities are subject to a 4.99% blocker and the percentage set forth in row (11) gives effect to such blocker. However, as more fully described in Item 4, the securities reported in rows (6), (8) and (9) show the number of shares of Common Stock that would be issuable upon full exercise of such reported securities and do not give effect to such blocker. Therefore, the actual number of shares of Common Stock beneficially owned by such Reporting Person, after giving effect to such blocker, is less than the number of securities reported in rows (6), (8) and (9).

CUSIP No. 72919P202 13G/A Page 3 of 7 Pages

1	NAMES OF REPORTING PERSONS Ryan M. Lane
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP	(a) ¨ (b) x
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION United States
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	5	SOLE VOTING POWER 0
	6	SHARED VOTING POWER 423,440 shares of Common Stock Warrants to purchase 1,241,250 shares of Common Stock (see Item 4)*
	7	SOLE DISPOSITIVE POWER 0
	8	SHARED DISPOSITIVE POWER 423,440 shares of Common Stock Warrants to purchase 1,241,250 shares of Common Stock (see Item 4)*
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 423,440 shares of Common Stock Warrants to purchase 1,241,250 shares of Common Stock (see Item 4)*
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES	¨
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 4.99% (see Item 4)
12	TYPE OF REPORTING PERSON IN

• As more fully described in Item 4, these reported securities are subject to a 4.99% blocker and the percentage set forth in row (11) gives effect to such blocker. However, as more fully described in Item 4, the securities reported in rows (6), (8) and (9) show the number of shares of Common Stock that would be issuable upon full exercise of such reported securities and do not give effect to such blocker. Therefore, the actual number of shares of Common Stock beneficially owned by such Reporting Person, after giving effect to such blocker, is less than the number of securities reported in rows (6), (8) and (9).

CUSIP No. 72919P202 13G/A Page 4 of 7 Pages

1	NAMES OF REPORTING PERSONS Martin D. Hoe
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP	(a) x (b) ¨
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION United States
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	5	SOLE VOTING POWER 0
	6	SHARED VOTING POWER 423,440 shares of Common Stock Warrants to purchase 1,241,250 shares of Common Stock (see Item 4)*
	7	SOLE DISPOSITIVE POWER 0
	8	SHARED DISPOSITIVE POWER 423,440 shares of Common Stock Warrants to purchase 1,241,250 shares of Common Stock (see Item 4)*
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 423,440 shares of Common Stock Warrants to purchase 1,241,250 shares of Common Stock (see Item 4)*
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES	¨
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 4.99% (see Item 4)
12	TYPE OF REPORTING PERSON IN

• As more fully described in Item 4, these reported securities are subject to a 4.99% blocker and the percentage set forth in row (11) gives effect to such blocker. However, as more fully described in Item 4, the securities reported in rows (6), (8) and (9) show the number of shares of Common Stock that would be issuable upon full exercise of such reported securities and do not give effect to such blocker. Therefore, the actual number of shares of Common Stock beneficially owned by such Reporting Person, after giving effect to such blocker, is less than the number of securities reported in rows (6), (8) and (9).

EFPlaceholder

CUSIP No. 72919P202 13G/A Page 5 of 7 Pages

This Amendment No. 1 (this "Amendment") amends the statement on Schedule 13G filed on May 27, 2011 (the "Original Schedule 13G" and the Original Schedule 13G as amended, the "Schedule 13G"), with respect to shares of common stock, par value $0.01 (the "Common Stock"), of Plug Power Inc., a Delaware corporation (the "Company"). Capitalized terms used herein and not otherwise defined in this Amendment have the meanings set forth in the Schedule 13G. This Amendment amends and restates Items 2(b), 2(e), 4 and 5 in their entirety as set forth below.

Item 2(b). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE

The address of the business office of each of the Reporting Persons is:
1 Rockefeller Plaza, Suite 1205 New York, NY 10020

Item 2(e).
72919P202

ITEM 4. OWNERSHIP .

The information as of the filing date required by Items 4(a) – (c) is set forth in Rows 5 – 11 of the cover page for each Reporting Person hereto and is incorporated herein by reference for each such Reporting Person.

The percentage set forth in Row (11) of the cover page for each Reporting Person is based on 22,736,504 shares of Common Stock issued and outstanding as of November 7, 2011, as represented in the Company's Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2011, filed with the Securities and Exchange Commission on November 9, 2011 and assumes the exercise of the reported warrants (the “Reported Warrants”) subject to the Blocker (as defined below).

Pursuant to the terms of the Reported Warrants, the Reporting Persons cannot exercise any of the Reported Warrants until such time as the Reporting Persons would not beneficially own, after any such exercise, more than 4.99% of the outstanding shares of Common Stock (the "Blocker"), and the percentage set forth in Row (11) of the cover page for each Reporting Person gives effect to the Blocker. Consequently, at this time, the Reporting Persons are not able to exercise all of the Reported Warrants due to the Blocker.

Therefore, as of the date hereof, each of the Reporting Persons may be deemed to beneficially own 4.99% of the outstanding shares of Common Stock of the Company. The foregoing should not be construed in and of itself as an admission by any Reporting Person as to beneficial ownership of shares of Common Stock owned by another Reporting Person.

CUSIP No. 72919P202 13G/A Page 6 of 7 Pages

The Investment Manager, which serves as the investment manager to the Empery Funds, may be deemed to be the beneficial owner of all shares of Common Stock held by the Empery Funds. Each of the Reporting Individuals, as Managing Members of the General Partner of the Investment Manager with the power to exercise investment discretion, may be deemed to be the beneficial owner of all shares of Common Stock held by the Empery Funds. Each of the Reporting Individuals hereby disclaims any beneficial ownership of any such shares of Common Stock.

ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following: [X]

CUSIP No. 72919P202 13G/A Page 7 of 7 Pages

SIGNATURES

After reasonable inquiry and to the best of its knowledge and belief, each of the undersigned certifies that the information with respect to it set forth in this statement is true, complete, and correct.

DATED: January 25, 2012

EMPERY ASSET MANAGEMENT, LP
By: EMPERY AM GP, LLC, its General Partner
	/s/ Ryan M. Lane
	RYAN M. LANE
By:	/s/ Ryan M. Lane
Name: Ryan M. Lane
Title: Managing Member
/s/ Martin D. Hoe
MARTIN D. HOE