UNITED STATES
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SECURITIES AND EXCHANGE COMMISSION
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Washington, D.C. 20549
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SCHEDULE 13G/A
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Under the Securities Exchange Act of 1934
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(Amendment No. 1)*
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Plug Power Inc.
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(Name of Issuer)
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Common Stock, $0.01 par value
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(Title of Class of Securities)
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72919P202
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(CUSIP Number)
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December 31, 2011
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(Date of event which requires filing of this statement)
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Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
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¨
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Rule 13d-1(b)
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x
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Rule 13d-1(c)
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¨
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Rule 13d-1(d)
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(Page 1 of 7 Pages)
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CUSIP No. 72919P202
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13G/A
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Page 2 of 7 Pages
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1
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NAMES OF REPORTING PERSONS
Empery Asset Management, LP
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2
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CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
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(a) ¨
(b) x
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3
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SEC USE ONLY
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4
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CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
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NUMBER OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON WITH
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5
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SOLE VOTING POWER
0
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6
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SHARED VOTING POWER
423,440 shares of Common Stock
Warrants to purchase 1,241,250 shares of Common Stock (see Item 4)*
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7
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SOLE DISPOSITIVE POWER
0
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8
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SHARED DISPOSITIVE POWER
423,440 shares of Common Stock
Warrants to purchase 1,241,250 shares of Common Stock (see Item 4)*
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9
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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)*
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10
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CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
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¨
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11
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PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
4.99% (see Item 4)
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12
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TYPE OF REPORTING PERSON
PN
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CUSIP No. 72919P202
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13G/A
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Page 3 of 7 Pages
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1
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NAMES OF REPORTING PERSONS
Ryan M. Lane
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2
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CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
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(a) ¨
(b) x
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3
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SEC USE ONLY
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4
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CITIZENSHIP OR PLACE OF ORGANIZATION
United States
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NUMBER OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON WITH
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5
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SOLE VOTING POWER
0
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||||
6
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SHARED VOTING POWER
423,440 shares of Common Stock
Warrants to purchase 1,241,250 shares of Common Stock (see Item 4)*
|
|||||
7
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SOLE DISPOSITIVE POWER
0
|
|||||
8
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SHARED DISPOSITIVE POWER
423,440 shares of Common Stock
Warrants to purchase 1,241,250 shares of Common Stock (see Item 4)*
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|||||
9
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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)*
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|||||
10
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CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
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¨
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||||
11
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PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
4.99% (see Item 4)
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12
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TYPE OF REPORTING PERSON
IN
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CUSIP No. 72919P202
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13G/A
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Page 4 of 7 Pages
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1
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NAMES OF REPORTING PERSONS
Martin D. Hoe
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2
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CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
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(a) x
(b) ¨
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3
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SEC USE ONLY
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4
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CITIZENSHIP OR PLACE OF ORGANIZATION
United States
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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)*
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|||||
9
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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)*
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|||||
10
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CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
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¨
|
||||
11
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PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
4.99% (see Item 4)
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12
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TYPE OF REPORTING PERSON
IN
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CUSIP No. 72919P202
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13G/A
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Page 5 of 7 Pages
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Item 2(b).
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ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
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The address of the business office of each of the Reporting Persons is:
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1 Rockefeller Plaza, Suite 1205
New York, NY 10020
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Item 2(e).
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CUSIP NUMBER
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72919P202
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Item 4.
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OWNERSHIP.
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CUSIP No. 72919P202
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13G/A
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Page 6 of 7 Pages
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Item 5.
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OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.
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CUSIP No. 72919P202
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13G/A
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Page 7 of 7 Pages
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EMPERY ASSET MANAGEMENT, LP
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By: EMPERY AM GP, LLC, its General Partner
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/s/ Ryan M. Lane
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RYAN M. LANE
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By:
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/s/ Ryan M. Lane
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Name: Ryan M. Lane
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Title: Managing Member
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/s/ Martin D. Hoe
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MARTIN D. HOE
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