Who owns Gibraltar Industries (ROCK)
Which tracked institutional funds hold ROCK, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ROCK company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
76 tracked funds added or opened ROCK while 38 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
ROCK’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes ROCK more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in ROCK divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 223 tracked filers holding ROCK, 138 increased or opened the position and 121 reduced or closed it; over the same quarter, open-market insider Form 4s were net purchases. A multi-insider buy cluster also fired inside the quarter.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in ROCK between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 14
- Simcoe Capital Management, LLC$22M
- MONIMUS CAPITAL MANAGEMENT, LP$4M
- Man Group plc$4M
- Squarepoint Ops LLC$4M
- MILLENNIUM MANAGEMENT LLC$3M
- Skylands Capital, LLC$2M
Full exits 19
- T. Rowe Price Investment Management, Inc.$19M
- NORDEA INVESTMENT MANAGEMENT AB$5M
- Pacer Advisors, Inc.$5M
- Congruence Capital, LLC$4M
- BESSEMER GROUP INC$3M
- South Dakota Investment Council$2M
Largest adds
- BlackRock, Inc.$88M
- FMR LLC$30M
- FRONTIER CAPITAL MANAGEMENT CO LLC$10M
- SEGALL BRYANT & HAMILL, LLC$9M
- SG Capital Management LLC$8M
- VANGUARD CAPITAL MANAGEMENT LLC$7M
Largest trims
- ALLIANCEBERNSTEIN L.P.$20M
- FIRST WILSHIRE SECURITIES MANAGEMENT INC$8M
- PALISADE CAPITAL MANAGEMENT, LP$7M
- Boston Partners$7M
- BARROW HANLEY MEWHINNEY & STRAUSS LLC$2M
- GOLDMAN SACHS GROUP INC$2M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 4,919,877 | $222M | 16.4% | 2026-Q2 |
| FMR LLC added | 4,449,287 | $201M | 14.8% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 2,232,832 | $89M | 6.6% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 1,499,025 | $68M | 5.0% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 1,332,679 | $60M | 4.4% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC trimmed | 1,290,636 | $58M | 4.3% | 2026-Q2 |
| STATE STREET CORP trimmed | 1,228,984 | $55M | 4.1% | 2026-Q2 |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC trimmed | 984,916 | $44M | 3.3% | 2026-Q2 |
| FRONTIER CAPITAL MANAGEMENT CO LLC added | 830,272 | $37M | 2.8% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 822,869 | $37M | 2.7% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 805,620 | $36M | 2.7% | 2026-Q2 |
| SEGALL BRYANT & HAMILL, LLC added | 587,545 | $26M | 2.0% | 2026-Q2 |
| Simcoe Capital Management, LLC new | 494,365 | $22M | 1.6% | 2026-Q2 |
| Boston Partners trimmed | 464,628 | $21M | 1.5% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 445,326 | $20M | 1.5% | 2026-Q2 |
| ROYCE & ASSOCIATES LP added | 402,365 | $18M | 1.3% | 2026-Q2 |
| SG Capital Management LLC added | 389,410 | $18M | 1.3% | 2026-Q2 |
| MORGAN STANLEY trimmed | 357,210 | $16M | 1.2% | 2026-Q2 |
| NORTHERN TRUST CORP added | 353,253 | $16M | 1.2% | 2026-Q2 |
| FIRST WILSHIRE SECURITIES MANAGEMENT INC trimmed | 268,773 | $12M | 0.9% | 2026-Q2 |
| UBS Group AG added | 254,651 | $11M | 0.8% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. added | 243,403 | $11M | 0.8% | 2026-Q2 |
| KENNEDY CAPITAL MANAGEMENT LLC trimmed | 240,064 | $11M | 0.8% | 2026-Q2 |
| D. E. Shaw & Co., Inc. trimmed | 224,747 | $10M | 0.7% | 2026-Q2 |
| Invenomic Capital Management LP added | 203,383 | $9M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 196,014 | $9M | 0.7% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 191,107 | $9M | 0.6% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 189,416 | $9M | 0.6% | 2026-Q2 |
| Bank of New York Mellon Corp added | 169,626 | $8M | 0.6% | 2026-Q2 |
| PALISADE CAPITAL MANAGEMENT, LP trimmed | 168,431 | $8M | 0.6% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 159,586 | $7M | 0.5% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 146,525 | $7M | 0.5% | 2026-Q2 |
| Invesco Ltd. trimmed | 144,410 | $7M | 0.5% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 133,857 | $6M | 0.4% | 2026-Q2 |
| Edgestream Partners, L.P. added | 125,631 | $6M | 0.4% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 125,116 | $6M | 0.4% | 2026-Q2 |
| RBF Capital, LLC | 123,099 | $6M | 0.4% | 2026-Q2 |
| CastleKnight Management LP trimmed | 122,500 | $6M | 0.4% | 2026-Q2 |
| Nuveen, LLC added | 110,246 | $5M | 0.4% | 2026-Q2 |
| SYSTEMATIC FINANCIAL MANAGEMENT LP trimmed | 104,769 | $5M | 0.3% | 2026-Q2 |
| Public Sector Pension Investment Board trimmed | 101,911 | $5M | 0.3% | 2026-Q2 |
| GAMCO INVESTORS, INC. ET AL trimmed | 96,625 | $4M | 0.3% | 2026-Q2 |
| PRIMECAP MANAGEMENT CO/CA/ | 95,600 | $4M | 0.3% | 2026-Q2 |
| MONIMUS CAPITAL MANAGEMENT, LP new | 91,939 | $4M | 0.3% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 87,546 | $4M | 0.3% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 85,913 | $4M | 0.3% | 2026-Q2 |
| Man Group plc added | 83,282 | $4M | 0.3% | 2026-Q2 |
| Squarepoint Ops LLC added | 83,148 | $4M | 0.3% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 79,919 | $4M | 0.3% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 75,395 | $3M | 0.3% | 2026-Q2 |
| Expect Equity LLC added | 68,267 | $3M | 0.2% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 66,668 | $3M | 0.2% | 2026-Q2 |
| Legal & General Group Plc added | 64,755 | $3M | 0.2% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC trimmed | 64,336 | $3M | 0.2% | 2026-Q2 |
| PICTON MAHONEY ASSET MANAGEMENT added | 62,487 | $3M | 0.2% | 2026-Q2 |
| Swiss National Bank added | 59,600 | $3M | 0.2% | 2026-Q2 |
| LAZARD ASSET MANAGEMENT LLC added | 59,550 | $3M | 0.2% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC trimmed | 57,243 | $3M | 0.2% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 56,573 | $3M | 0.2% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 56,083 | $3M | 0.2% | 2026-Q2 |
| WESBANCO BANK INC added | 55,328 | $2M | 0.2% | 2026-Q2 |
| Teton Advisors, LLC | 52,000 | $2M | 0.2% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 50,504 | $2M | 0.2% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. trimmed | 49,795 | $2M | 0.2% | 2026-Q2 |
| MARSHALL WACE, LLP added | 43,345 | $2M | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 40,571 | $2M | 0.1% | 2026-Q2 |
| WEDGE CAPITAL MANAGEMENT L L P/NC added | 39,125 | $2M | 0.1% | 2026-Q2 |
| Atom Investors LP added | 37,434 | $2M | 0.1% | 2026-Q2 |
| CAPITAL FUND MANAGEMENT S.A. added | 36,794 | $2M | 0.1% | 2026-Q2 |
| BFSG, LLC added | 36,266 | $2M | 0.1% | 2026-Q2 |
| Creative Planning added | 36,095 | $2M | 0.1% | 2026-Q2 |
| FIFTH THIRD BANCORP added | 34,578 | $2M | 0.1% | 2026-Q2 |
| GABELLI FUNDS LLC added | 34,105 | $2M | 0.1% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 34,057 | $2M | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 33,679 | $2M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 33,404 | $2M | 0.1% | 2026-Q2 |
| Skylands Capital, LLC added | 33,350 | $2M | 0.1% | 2026-Q2 |
| HUDSON EDGE INVESTMENT PARTNERS INC. added | 32,141 | $1M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 32,111 | $1M | 0.1% | 2026-Q2 |
| CAXTON ASSOCIATES LLP added | 31,979 | $1M | 0.1% | 2026-Q2 |
| BARCLAYS PLC trimmed | 31,731 | $1M | 0.1% | 2026-Q2 |
| Federation des caisses Desjardins du Quebec added | 29,789 | $1M | 0.1% | 2026-Q2 |
| Rafferty Asset Management, LLC added | 28,067 | $1M | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 26,182 | $1M | 0.1% | 2026-Q2 |
| FRANKLIN RESOURCES INC trimmed | 23,975 | $1M | 0.1% | 2026-Q2 |
| Kennondale Capital Management LLC trimmed | 23,544 | $1M | 0.1% | 2026-Q2 |
| FIRST TRUST ADVISORS LP added | 23,397 | $1M | 0.1% | 2026-Q2 |
| Quantbot Technologies LP added | 23,051 | $1M | 0.1% | 2026-Q2 |
| MOODY NATIONAL BANK TRUST DIVISION added | 22,265 | $1M | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP trimmed | 22,090 | $996K | 0.1% | 2026-Q2 |
| SHELTON CAPITAL MANAGEMENT trimmed | 21,455 | $968K | 0.1% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 21,039 | $1M | 0.1% | 2026-Q2 |
| ExodusPoint Capital Management, LP trimmed | 20,490 | $924K | 0.1% | 2026-Q2 |
| Van Hulzen Asset Management, LLC trimmed | 19,918 | $898K | 0.1% | 2026-Q2 |
| Corient Private Wealth LP trimmed | 19,477 | $878K | 0.1% | 2026-Q2 |
| Freestone Grove Partners LP trimmed | 17,859 | $805K | 0.1% | 2026-Q2 |
| FOX RUN MANAGEMENT, L.L.C. added | 17,734 | $800K | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 17,665 | $797K | 0.1% | 2026-Q2 |
| XTX Topco Ltd added | 17,587 | $793K | 0.1% | 2026-Q2 |
| Pathstone Holdings, LLC trimmed | 16,752 | $756K | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.