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PLUG POWER INC Director's Dealing 2012

Apr 2, 2012

31473_dirs_2012-04-02_21dfa7ba-318b-4b45-a14a-c264d7da6739.zip

Director's Dealing

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SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: PLUG POWER INC (PLUG)
CIK: 0001093691
Period of Report: 2012-03-23

Reporting Person: MARXE AUSTIN W & GREENHOUSE DAVID M (10% Owner)

Holdings (Non-Derivative)

Security Shares Ownership
Common Stock 8511620 Indirect

Holdings (Derivative)

Security Exercise Price Expiration Underlying Shares Ownership
Warrant $2.27 2016-05-31 Common Stock (2801762) Indirect

Footnotes

F1: This is a joint filing by Austin W. Marxe (Marxe) and David M. Greenhouse (Greenhouse). They share voting and investment control over all securities owned by Special Situations Fund III QP, L.P. (SSFQP), Special Situations Cayman Fund, L.P. (Cayman), Special Situations Private Equity Fund, L.P. (PE), Special Situations Technology Fund, L.P. (Tech) and Special Situations Technology Fund II, L.P. (Tech2). 3,158,900 shares of Common Stock are held by SSFQP, 950,000 shares of Common Stock are held by Cayman, 581,385 shares of Common Stock are held by PE, 530,942 shares of Common Stock are held by Tech and 3,290,393 shares of Common Stock are held by Tech2. The interest of Marxe and Greenhouse in the shares of Common Stock owned by SSFQP, Cayman, PE, Tech and Tech2 is limited to the extent of his pecuniary interest.

F2: This is a joint filing by Austin W. Marxe (Marxe) and David M. Greenhouse (Greenhouse). They share voting and investment control over all securities owned by, Special Situations Private Equity Fund, LP (PE), Special Situations Technology Fund, L.P. (Tech) and Special Situations Technology Fund II, L.P. (Tech2). 419,145 Warrants are owned by PE, 231,239 Warrants are owned by Tech and 1,469,616 Warrants are owned by Tech2. The interest of Marxe and Greenhouse in the shares of Warrants owned by PE, Tech and Tech2 are limited to the extent of his pecuniary interest.

F3: The warrant may be exercised to the extent that the total number of shares of Common Stock then beneficially owned does not exceed 4.99% of the outstanding shares. The Holder may request an increase up to 9.99% of the outstanding shares, effective on the 61st day after notice is given to the Company.