Arnold John W

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

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Abbreviations B: Buy, S: Sell, PP: Planned purchase, PS: Planned sale, O: Option / Other

Notification date	Transaction date	B/S Transaction type	Nb. shares Price Value	Number of shares	Price	Value	Details
2011-12-30	2011-12-29	Gentex Corp (GNTX)	S Sale	2,928 -22.3% 29.34 USD 85,896	2,928 -22.3%	29.34	USD 85,896
2011-12-28	2011-12-27	Gentex Corp (GNTX)	S Sale	7,968 -43.9% 29.70 USD 236,650	7,968 -43.9%	29.70	USD 236,650
2010-12-30	2010-12-29	Gentex Corp (GNTX)	S Sale	13,256 -56.6% 29.63 USD 392,814	13,256 -56.6%	29.63	USD 392,814
2010-12-30	2010-12-28	Gentex Corp (GNTX)	S Sale	4,800 -32.0% 29.41 USD 141,146	4,800 -32.0%	29.41	USD 141,146
2010-12-03	2010-12-01	Gentex Corp (GNTX)	S Sale	30,440 -67.0% 21.90 USD 666,663	30,440 -67.0%	21.90	USD 666,663