ROCK Gibraltar Industries Inc.
Gibraltar Industries Inc. (ROCK) Institutional Ownership
What the institutions did with ROCK last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| BlackRock, Inc. | 4.9M | 15.8% |
| FMR LLC | 4.4M | 14.3% |
| ALLIANCEBERNSTEIN L.P. | 2.2M | 7.2% |
| DIMENSIONAL FUND ADVISORS LP | 1.5M | 4.8% |
| VANGUARD CAPITAL MANAGEMENT LLC | 1.3M | 4.3% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 1.3M | 4.1% |
| STATE STREET CORP | 1.2M | 3.9% |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC | 984.9K | 3.2% |
| FRONTIER CAPITAL MANAGEMENT CO LLC | 830.3K | 2.7% |
| GEODE CAPITAL MANAGEMENT, LLC | 822.9K | 2.6% |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 805.6K | 2.6% |
| SEGALL BRYANT & HAMILL, LLC | 587.5K | 1.9% |
| Simcoe Capital Management, LLC | 494.4K | 1.6% |
| Boston Partners | 464.6K | 1.5% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 445.3K | 1.4% |
| ROYCE & ASSOCIATES LP | 402.4K | 1.3% |
| SG Capital Management LLC | 389.4K | 1.2% |
| MORGAN STANLEY | 357.2K | 1.1% |
| NORTHERN TRUST CORP | 353.3K | 1.1% |
| FIRST WILSHIRE SECURITIES MANAGEMENT INC | 268.8K | 0.9% |
| UBS Group AG | 254.7K | 0.8% |
| Balyasny Asset Management L.P. | 243.4K | 0.8% |
| KENNEDY CAPITAL MANAGEMENT LLC | 240.1K | 0.8% |
| D. E. Shaw & Co., Inc. | 224.7K | 0.7% |
| Invenomic Capital Management LP | 203.4K | 0.7% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| Simcoe Capital Management, LLC | New | 0 | 494.4K | +494.4K |
| T. Rowe Price Investment Management, Inc. | Sold Out | 467.0K | 0 | -467.0K |
| FIRST WILSHIRE SECURITIES MANAGEMENT INC | Reduced | 499.9K | 268.8K | -231.2K |
| Boston Partners | Reduced | 686.6K | 464.6K | -222.0K |
| DIMENSIONAL FUND ADVISORS LP | Reduced | 1.7M | 1.5M | -207.0K |
| PALISADE CAPITAL MANAGEMENT, LP | Reduced | 358.9K | 168.4K | -190.4K |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC | Reduced | 1.2M | 984.9K | -185.1K |
| SEGALL BRYANT & HAMILL, LLC | Increased | 431.0K | 587.5K | +156.6K |
| SG Capital Management LLC | Increased | 233.8K | 389.4K | +155.6K |
| FRONTIER CAPITAL MANAGEMENT CO LLC | Increased | 688.3K | 830.3K | +142.0K |
| BlackRock, Inc. | Reduced | 5.0M | 4.9M | -129.1K |
| Balyasny Asset Management L.P. | Increased | 116.8K | 243.4K | +126.6K |
| NORDEA INVESTMENT MANAGEMENT AB | Sold Out | 117.5K | 0 | -117.5K |
| STATE STREET CORP | Reduced | 1.3M | 1.2M | -116.7K |
| Pacer Advisors, Inc. | Sold Out | 114.9K | 0 | -114.9K |
| ROYCE & ASSOCIATES LP | Increased | 288.5K | 402.4K | +113.8K |
| Congruence Capital, LLC | Sold Out | 105.4K | 0 | -105.4K |
| MONIMUS CAPITAL MANAGEMENT, LP | New | 0 | 91.9K | +91.9K |
| Man Group plc | New | 0 | 83.3K | +83.3K |
| Squarepoint Ops LLC | New | 0 | 83.1K | +83.1K |
| CITADEL ADVISORS LLC | Increased | 118.4K | 191.1K | +72.7K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 15.5K | 85.9K | +70.4K |
| GOLDMAN SACHS GROUP INC | Reduced | 194.7K | 125.1K | -69.6K |
| Edgestream Partners, L.P. | Increased | 61.0K | 125.6K | +64.6K |
| AQR CAPITAL MANAGEMENT LLC | Increased | 96.0K | 159.6K | +63.6K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | Increased | 742.3K | 805.6K | +63.4K |
| PICTON MAHONEY ASSET MANAGEMENT | Increased | 17 | 62.5K | +62.5K |
| UBS Group AG | Increased | 197.3K | 254.7K | +57.3K |
| MILLENNIUM MANAGEMENT LLC | New | 0 | 56.6K | +56.6K |
| RENAISSANCE TECHNOLOGIES LLC | Increased | 15.5K | 66.7K | +51.2K |
| LAZARD ASSET MANAGEMENT LLC | Increased | 12.3K | 59.6K | +47.3K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 777.6K | 822.9K | +45.2K |
| SG Americas Securities, LLC | Increased | 7.0K | 46.3K | +39.3K |
| PRUDENTIAL FINANCIAL INC | Increased | 36.5K | 75.4K | +38.9K |
| Advisors Preferred, LLC | Sold Out | 38.1K | 0 | -38.1K |
| Nuveen, LLC | Increased | 72.8K | 110.2K | +37.5K |
| ALLIANCEBERNSTEIN L.P. | Increased | 2.2M | 2.2M | +34.4K |
| Skylands Capital, LLC | New | 0 | 33.4K | +33.4K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Reduced | 1.3M | 1.3M | -33.1K |
| MARSHALL WACE, LLP | Increased | 10.5K | 43.3K | +32.9K |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | Sold Out | 30.2K | 0 | -30.2K |
| CastleKnight Management LP | Reduced | 150.5K | 122.5K | -28.0K |
| D. E. Shaw & Co., Inc. | Reduced | 249.7K | 224.7K | -24.9K |
| Cascade Investment Advisors, Inc. | Sold Out | 22.0K | 0 | -22.0K |
| WESBANCO BANK INC | Increased | 33.9K | 55.3K | +21.4K |
| Quantbot Technologies LP | Increased | 2.0K | 23.1K | +21.1K |
| Aviance Capital Partners, LLC | Sold Out | 20.8K | 0 | -20.8K |
| ExodusPoint Capital Management, LP | New | 0 | 20.5K | +20.5K |
| Invenomic Capital Management LP | Increased | 183.1K | 203.4K | +20.3K |
| Creative Planning | Increased | 16.3K | 36.1K | +19.7K |
| NORTHERN TRUST CORP | Increased | 333.9K | 353.3K | +19.4K |
| Atom Investors LP | Increased | 18.9K | 37.4K | +18.6K |
| Kennondale Capital Management LLC | Reduced | 41.9K | 23.5K | -18.3K |
| Assenagon Asset Management S.A. | Reduced | 49.7K | 32.4K | -17.3K |
| FMR LLC | Increased | 4.4M | 4.4M | +17.2K |
| Quantinno Capital Management LP | Reduced | 38.7K | 22.1K | -16.6K |
| Connor, Clark & Lunn Investment Management Ltd. | Reduced | 66.1K | 49.8K | -16.3K |
| CAPITAL FUND MANAGEMENT S.A. | Increased | 20.6K | 36.8K | +16.2K |
| Engineers Gate Manager LP | New | 0 | 14.6K | +14.6K |
| WELLS FARGO & COMPANY/MN | Increased | 11.6K | 26.2K | +14.6K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.