Gary Willis

Currently holds positions in Plug Power Inc and Zygo Corp

Position	Company	Period
Independent Director	Plug Power Inc	March 1, 2003 -
Interim Chief Executive Officer	Zygo Corp	June 20, 2014 -
Independent Director	Rofin-Sinar Technologies LLC	Sept. 1, 1996 - Nov. 7, 2016
Interim Chief Executive Officer, Director	Zygo Corp	Oct. 21, 2013 - June 20, 2014
Independent Director	Zygo Corp	June 16, 2009 - Oct. 21, 2013

• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings

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Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other

Notification date	Transaction date	Company	B/S Transaction type	Nb. shares Price Value	Number of shares	Price	Value	Details
2020-12-15	2020-12-11	Plug Power Inc (PLUG)	PlS Planned sale	66,129 -47.0% 335.05 US$2,564,372	66,129 -47.0%	335.05	US$2,564,372
2020-12-15	2020-12-11	Plug Power Inc (PLUG)	PlS Planned sale	23,102 -4.8% 361.16 US$616,050	23,102 -4.8%	361.16	US$616,050