GENTEX CORP

Ticker: GNTX CUSIP: 371901109 Class: COM

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC's Holding History (CIK: 0001644956)

Note: Option positions (PUT/CALL) are excluded.

Q3 2018

Shares 47,193 Value ($000) $1,013 Avg Close $23.14 Range $21.11 - $24.94

Q2 2018

Shares 47,110 Value ($000) $1,084 Avg Close $23.73 Range $21.82 - $25.41

Q3 2015

Shares 24,266 Value ($000) $376 Avg Close $15.89 Range $13.84 - $16.80

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2018	47,193	$1,013	$23.14	$21.11 - $24.94
Q2 2018	47,110	$1,084	$23.73	$21.82 - $25.41
Q3 2015	24,266	$376	$15.89	$13.84 - $16.80