Ranked by reported Q2 2026 13F market value
Share of total reported institutional value in ROCK held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 4.9M | $221.9M | -2.6% | 16.587% | 0.00% |
| 2 | FMR LLC | 4.4M | $200.7M | +0.4% | 15.000% | 0.01% |
| 3 | ALLIANCEBERNSTEIN L.P. | 2.2M | $89.0M | +1.6% | 7.528% | 0.03% |
| 4 | DIMENSIONAL FUND ADVISORS LP | 1.5M | $67.6M | -12.1% | 5.054% | 0.01% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 1.3M | $60.1M | +0.8% | 4.493% | 0.00% |
| 6 | VANGUARD PORTFOLIO MANAGEMENT LLC | 1.3M | $58.2M | -2.5% | 4.351% | 0.00% |
| 7 | STATE STREET CORP | 1.2M | $55.4M | -8.7% | 4.143% | 0.00% |
| 8 | BARROW HANLEY MEWHINNEY & STRAUSS LLC | 985K | $44.4M | -15.8% | 3.321% | 0.13% |
| 9 | FRONTIER CAPITAL MANAGEMENT CO LLC | 830K | $37.4M | +20.6% | 2.799% | 0.35% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | 823K | $37.1M | +5.8% | 2.774% | 0.00% |
| 11 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 806K | $36.3M | +8.5% | 2.716% | 0.04% |
| 12 | SEGALL BRYANT & HAMILL, LLC | 588K | $26.5M | +36.3% | 1.981% | 0.31% |
| 13 | Simcoe Capital Management, LLC | 494K | $22.3M | — | 1.667% | 4.06% |
| 14 | Boston Partners | 465K | $20.7M | -32.3% | 1.566% | 0.02% |
| 15 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 445K | $20.1M | +1.1% | 1.501% | 0.00% |
| 16 | ROYCE & ASSOCIATES LP | 402K | $18.1M | +39.5% | 1.357% | 0.15% |
| 17 | SG Capital Management LLC | 389K | $17.6M | +66.5% | 1.313% | 1.45% |
| 18 | MORGAN STANLEY | 357K | $16.1M | -1.4% | 1.204% | 0.00% |
| 19 | NORTHERN TRUST CORP | 353K | $15.9M | +5.8% | 1.191% | 0.00% |
| 20 | FIRST WILSHIRE SECURITIES MANAGEMENT INC | 269K | $12.1M | -46.2% | 0.906% | 2.50% |
| 21 | UBS Group AG | 255K | $11.5M | +29.0% | 0.859% | 0.00% |
| 22 | BALYASNY ASSET MANAGEMENT L.P. | 243K | $11.0M | +108.4% | 0.821% | 0.01% |
| 23 | KENNEDY CAPITAL MANAGEMENT LLC | 240K | $10.8M | -2.9% | 0.809% | 0.19% |
| 24 | D. E. Shaw & Co., Inc. | 225K | $10.1M | -10.0% | 0.758% | 0.00% |
| 25 | Invenomic Capital Management LP | 203K | $9.2M | +11.1% | 0.686% | 0.55% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in ROCK — a direct measure of their conviction.
Filings activity in ROCK during Q2 2026, grouped by how each filer changed its position.
Institutions that opened a new ROCK position in Q2 2026
Institutions that fully closed their ROCK position in Q2 2026
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 245 | +7.9% | 105.15% | +0.47 pp | $1.38B | +13% |
| Q1 2026 | 227 | 9.2% | 104.68% | +3.94 pp | $1.22B | 15% |
| Q4 2025 | 250 | 4.9% | 100.74% | 0.78 pp | $1.43B | 21% |
| Q3 2025 | 263 | 0.4% | 101.52% | +1.04 pp | $1.82B | +8.5% |
| Q2 2025 | 264 | +0.4% | 100.48% | 0.37 pp | $1.68B | +0.6% |
| Q1 2025 | 263 | 5.7% | 100.85% | 0.58 pp | $1.67B | +0.3% |
| Q4 2024 | 279 | 1.8% | 101.43% | 0.53 pp | $1.66B | 15% |
| Q3 2024 | 284 | — | 101.96% | — | $1.96B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Latest Form 4 transactions by company officers and directors. Insider buys are widely viewed as a key fundamental indicator because executives are risking personal capital.
| Date | Insider | Action | Shares | Price | Value |
|---|---|---|---|---|---|
| May 26, 2026 | Bosway William T | Buy | 20K | $37.44 | $739K |
| May 21, 2026 | Bolanowski Katherine | Buy | 1K | $35.63 | $45K |
Quick answers to the most common questions about buying ROCK stock.
Based on Q2 2026 13F filings, institutional ownership of Gibraltar Industries, Inc. stands at 105.2%, held across 245 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of ROCK, with approximately 4,919,877 shares worth $0.22B as of Q2 2026.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of ROCK.
Our composite Smart Money Score for ROCK is 46 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
50 institutions opened new positions in ROCK during Q2 2026, while 32 fully exited. 140 added to existing positions and 50 trimmed.
ROCK institutional ownership rose by 0.47 percentage points quarter-over-quarter, with a net change of +18 holders.
The top 10 institutions account for 63.3% of all reported 13F value in ROCK, and the top 25 account for 82.0%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Gibraltar Industries, Inc. (ROCK) Institutional Ownership