GIBRALTAR INDS INC

Ticker: ROCK CUSIP: 374689107 Class: EQTY

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

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

Q2 2021

Shares 17,830 Value ($000) $1,361 Avg Close $82.64 Range $72.26 - $96.33

Q1 2021

Shares 154,514 Value ($000) $14,140 Avg Close $91.76 Range $73.29 - $103.02

Q4 2020

Shares 244,826 Value ($000) $17,613 Avg Close $66.77 Range $56.97 - $74.00

Q3 2020

Shares 261,432 Value ($000) $17,030 Avg Close $59.00 Range $45.82 - $69.64

Q2 2020

Shares 239,579 Value ($000) $11,502 Avg Close $44.46 Range $36.39 - $53.45

Q1 2020

Shares 159,682 Value ($000) $6,854 Avg Close $50.01 Range $30.60 - $56.58

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2021	17,830	$1,361	$82.64	$72.26 - $96.33
Q1 2021	154,514	$14,140	$91.76	$73.29 - $103.02
Q4 2020	244,826	$17,613	$66.77	$56.97 - $74.00
Q3 2020	261,432	$17,030	$59.00	$45.82 - $69.64
Q2 2020	239,579	$11,502	$44.46	$36.39 - $53.45
Q1 2020	159,682	$6,854	$50.01	$30.60 - $56.58