Joel D Gross

Insider

First SEC filing: June 30, 2006 · Latest: June 30, 2006

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Insider at

0 buys (P) 0 sells (S) Net: $0 + 14 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

No open-market trades on record; showing all filings.

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
April 2, 2009	PLUG	A	1,074	—	—	28,396 Direct	+3.93%	Acquired	(price as of 2026-08-20)
Jan. 2, 2009	PLUG	A	6,010	—	—	27,322 Direct	+28.20%	Acquired	(price as of 2026-08-20)
Oct. 2, 2008	PLUG	A	6,010	—	—	21,312 Direct	+39.28%	Acquired	(price as of 2026-08-20)
July 2, 2008	PLUG	A	2,593	—	—	15,302 Direct	+20.40%	Acquired	(price as of 2026-08-20)
May 21, 2008	PLUG	A	10,000	—	—	35,000 Direct	+40.00%	Acquired	(price as of 2026-08-20)
April 3, 2008	PLUG	A	1,941	—	—	12,709 Direct	+18.03%	Acquired	(price as of 2026-08-20)
Jan. 3, 2008	PLUG	A	1,547	—	—	10,768 Direct	+16.78%	Acquired	(price as of 2026-08-20)
Oct. 4, 2007	PLUG	A	2,029	—	—	9,221 Direct	+28.21%	Acquired	(price as of 2026-08-20)
July 2, 2007	PLUG	A	1,965	—	—	7,192 Direct	+37.59%	Acquired	(price as of 2026-08-20)
May 17, 2007	PLUG	A	10,000	—	—	25,000 Direct	+66.67%	Acquired	(price as of 2026-08-20)
April 3, 2007	PLUG	A	1,978	—	—	5,227 Direct	+60.88%	Acquired	(price as of 2026-08-20)
Jan. 8, 2007	PLUG	A	1,667	—	—	3,249 Direct	+105.37%	Acquired	(price as of 2026-08-20)
Oct. 2, 2006	PLUG	A	1,582	—	—	1,582 Direct	—	Acquired	(price as of 2026-08-20)
June 29, 2006	PLUG	A	15,000	$4.74	$71,100	15,000 Direct	—	Acquired	-95.3% (price as of 2026-08-20)

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Options, RSUs and convertible securities reported on Form 4 Table II.

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
May 21, 2008	PLUG	Option to Purchase Common Stock	Common Stock (10,000)	$3.21	May 21, 2018	10,000	Acquired
May 17, 2007	PLUG	Option to Purchase Common Stock	Common Stock (10,000)	$2.98	May 17, 2017	10,000	Acquired
June 29, 2006	PLUG	Option to Purchase Common Stock	Common Stock (15,000)	$4.74	June 29, 2016	15,000	Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Securities held when first becoming an insider, per SEC Form 3.

Date	Ticker	Security	Shares	Ownership
June 30, 2006	PLUG	No Securities are Beneficially Owned	0	Direct