GIBRALTAR INDS INC

Ticker: ROCK CUSIP: 374689107 Class: EQTY

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

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

Q3 2016

Shares 396 Value ($000) $15 Avg Close $36.62 Range $31.35 - $40.00

Q2 2016

Shares 4,496 Value ($000) $142 Avg Close $28.78 Range $24.12 - $32.46

Q1 2016

Shares 393 Value ($000) $11 Avg Close $23.31 Range $18.23 - $28.75

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2016	396	$15	$36.62	$31.35 - $40.00
Q2 2016	4,496	$142	$28.78	$24.12 - $32.46
Q1 2016	393	$11	$23.31	$18.23 - $28.75