245 institutional investment managers reported ROCK positions in their Form 13F filings for Q2 2026, holding 31,172,887 shares worth $1.4B in total. BlackRock, Inc. reported the largest position.

Are funds buying or selling ROCK?

In Q2 2026, 52 managers opened new ROCK positions, 89 added, 77 trimmed and 32 sold out. Managers that filed in both quarters added a net 279,042 shares.

How current is this ROCK institutional ownership data?

It covers holdings as of the end of Q2 2026. Managers have 45 days after the quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.

Funds · ROCK

Who owns ROCK?

Institutional ownership of Gibraltar Industries Inc. from Form 13F, Q2 2026

245 institutional managers reported holding Gibraltar Industries Inc. (ROCK) in Form 13F filings for Q2 2026, with 31,172,887 shares worth $1.4B. The largest reported holder was BlackRock, Inc. Managers that filed both quarters added a net 279,042 shares (+0.9%). 52 opened new positions and 32 sold out.

Funds holding: 245
Value held: $1.4B
New / sold out: 52 / 32
Net shares, same filers: +0.9%

Holdings as of June 30, 2026, the end of Q2 2026. Managers have 45 days after a quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.

Largest holders of ROCK

Fund	Value	Share of 13F holdings	Shares	Move
BlackRock, Inc.	$222M	15.8%	4,919,877	Trimmed
FMR LLC	$201M	14.3%	4,449,287	Added
Alliancebernstein L.p.	$89.0M	7.2%	2,232,832	Added
Dimensional Fund Advisors LP	$67.6M	4.8%	1,499,025	Trimmed
Vanguard Capital Management LLC	$60.1M	4.3%	1,332,679	Added
Vanguard Portfolio Management LLC	$58.2M	4.1%	1,290,636	Trimmed
State Street Corp	$55.4M	3.9%	1,228,984	Trimmed
Barrow Hanley Mewhinney & Strauss LLC	$44.4M	3.2%	984,916	Trimmed
Frontier Capital Management Co LLC	$37.4M	2.7%	830,272	Added
Geode Capital Management, LLC	$37.1M	2.6%	822,869	Added
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	$36.3M	2.6%	805,620	Added
Segall Bryant & Hamill, LLC	$26.5M	1.9%	587,545	Added
Simcoe Capital Management, LLC	$22.3M	1.6%	494,365	New
Boston Partners	$20.7M	1.5%	464,628	Trimmed
Charles Schwab Investment Management Inc	$20.1M	1.4%	445,326	Added
Royce & Associates LP	$18.1M	1.3%	402,365	Added
SG Capital Management LLC	$17.6M	1.2%	389,410	Added
Morgan Stanley	$16.1M	1.1%	357,210	Trimmed
Northern Trust Corp	$15.9M	1.1%	353,253	Added
First Wilshire Securities Management Inc	$12.1M	0.9%	268,773	Trimmed
UBS Group AG	$11.5M	0.8%	254,651	Added
Balyasny Asset Management L.P.	$11.0M	0.8%	243,403	Added
Kennedy Capital Management LLC	$10.8M	0.8%	240,064	Trimmed
D. E. Shaw & Co., Inc.	$10.1M	0.7%	224,747	Trimmed
Invenomic Capital Management LP	$9.2M	0.7%	203,383	Added

Share of 13F holdings is each fund's shares as a share of the 31,172,887 ROCK shares all 13F filers reported, not of shares outstanding.

Biggest buyers in Q2 2026

Simcoe Capital Management, LLC New+$22.3M
Segall Bryant & Hamill, LLC Added+$7.1M
SG Capital Management LLC Added+$7.0M
Frontier Capital Management Co LLC Added+$6.4M
Balyasny Asset Management L.P. Added+$5.7M
Royce & Associates LP Added+$5.1M
Monimus Capital Management, LP New+$4.1M
Man Group plc New+$3.8M
Squarepoint Ops LLC New+$3.7M
Citadel Advisors LLC Added+$3.3M

Biggest sellers in Q2 2026

T. Rowe Price Investment Management, Inc. Sold out-$18.6M
First Wilshire Securities Management Inc Trimmed-$10.4M
Boston Partners Trimmed-$9.9M
Dimensional Fund Advisors LP Trimmed-$9.3M
Palisade Capital Management, LP Trimmed-$8.6M
Barrow Hanley Mewhinney & Strauss LLC Trimmed-$8.3M
BlackRock, Inc. Trimmed-$5.8M
State Street Corp Trimmed-$5.3M
Nordea Investment Management AB Sold out-$4.6M
Congruence Capital, LLC Sold out-$4.2M

The change in shares since the quarter before, adjusted for stock splits and priced at the Q2 2026 value per share. Funds bought $131M and sold $114M; 89 added and 77 trimmed.

Schedule 13D and 13G filings on ROCK

Owners of more than 5% must file within days, so these can be newer than the 13F data.

2025-08-06FMR LLC SCHEDULE 13G filed by Gibraltar Industries Inc.Schedule 13G
2025-02-10WELLINGTON MANAGEMENT GROUP LLP SCHEDULE 13G filed by Gibraltar Industries Inc.Schedule 13G

Questions about ROCK ownership

Who owns ROCK stock?: 245 institutional investment managers reported ROCK positions in their Form 13F filings for Q2 2026, holding 31,172,887 shares worth $1.4B in total. BlackRock, Inc. reported the largest position.
Are funds buying or selling ROCK?: In Q2 2026, 52 managers opened new ROCK positions, 89 added, 77 trimmed and 32 sold out. Managers that filed in both quarters added a net 279,042 shares.
How current is this ROCK institutional ownership data?: It covers holdings as of the end of Q2 2026. Managers have 45 days after the quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.

From the SEC's Form 13F data sets for Q2 2026: every 13F holdings report, matched to ROCK by CUSIP. Options are left out. ROCK news and filings · ROCK insider trades · Top funds