Among active 13F managers last quarter, 7 opened and 32 added, while 14 reduced; the largest holder to move was AllianceBernstein L.P. (+28%). Over the last 180 days, 4 insiders bought and none sold, a net +$1.4M in open-market trades.
Funds lean in and no leg opposes.
206 tracked 13F filers disclose a position in ROCK as of the latest SEC 13F filings, a combined $1.3B in reported value. Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
| # | Fund | Shares | Position value | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 4.9M | $221.9M | ▼−2.5% Reduced · −129K sh | Q2 2026 | |
| 2 | FMR LLC | 4.4M | $200.7M | ▲+0.4% Added · +17K sh | Q2 2026 | |
| 3 | AllianceBernstein L.P. | 2.2M | $108.7M | ▲+28% Added · +484K sh | Q1 2026 | |
| 4 | Dimensional Fund Advisors LP | 1.7M | $68.0M | ▲+0.4% Added · +7K sh | Q1 2026 | |
| 5 | Vanguard Capital Management LLC | 1.3M | $60.1M | ▲+0.8% Added · +10K sh | Q2 2026 | |
| 6 | Vanguard Portfolio Management LLC | 1.3M | $58.2M | ▼−2.5% Reduced · −33K sh | Q2 2026 | |
| 7 | State Street Corp | 1.2M | $55.4M | ▼−8.7% Reduced · −117K sh | Q2 2026 | |
| 8 | Barrow Hanley Mewhinney & Strauss LLC | 1.2M | $46.6M | ▲+19% Added · +184K sh | Q1 2026 | |
| 9 | Frontier Capital Management Co LLC | 830K | $37.4M | ▲+21% Added · +142K sh | Q2 2026 | |
| 10 | Geode Capital Management, LLC | 823K | $37.1M | ▲+5.8% Added · +45K sh | Q2 2026 | |
| 11 | Mirae Asset Global Etfs Holdings Ltd. | 742K | $29.6M | ▲+52% Added · +255K sh | Q1 2026 | |
| 12 | Boston Partners | 687K | $27.3M | ▼−26% Reduced · −237K sh | Q1 2026 | |
| 13 | Segall Bryant & Hamill, LLC | 588K | $26.5M | ▲+36% Added · +157K sh | Q2 2026 | |
| 14 | Simcoe Capital Management, LLC | 494K | $22.3M | ▲New +494K sh | Q2 2026 | |
| 15 | Charles Schwab Investment Management Inc | 440K | $17.6M | ▲~0% Added · +50 sh | Q1 2026 | |
| 16 | SG Capital Management LLC | 389K | $17.6M | ▲+67% Added · +156K sh | Q2 2026 | |
| 17 | Morgan Stanley | 362K | $14.4M | ▼−17% Reduced · −72K sh | Q1 2026 | |
| 18 | Northern Trust Corp | 334K | $13.3M | ▲+3.6% Added · +12K sh | Q1 2026 | |
| 19 | D. E. Shaw & Co., Inc. | 250K | $10.0M | ▼−22% Reduced · −70K sh | Q1 2026 | |
| 20 | Kennedy Capital Management LLC | 247K | $9.9M | ▼−1.5% Reduced · −4K sh | Q1 2026 | |
| 21 | Invenomic Capital Management LP | 203K | $9.2M | ▲+11% Added · +20K sh | Q2 2026 | |
| 22 | UBS Group AG | 197K | $7.9M | ▲+197% Added · +131K sh | Q1 2026 | |
| 23 | Vanguard Fiduciary Trust Co | 196K | $8.8M | ▲+1.2% Added · +2K sh | Q2 2026 | |
| 24 | Goldman Sachs Group Inc | 195K | $7.8M | ▲+8.1% Added · +15K sh | Q1 2026 | |
| 25 | Citadel Advisors LLC | 191K | $8.6M | ▲+61% Added · +73K sh | Q2 2026 |
Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership. 1 value row is withheld because the reported units disagree with same-security peers; share counts are unchanged.
Last quarter, 7 funds opened a new position in ROCK and 32 added to an existing one, while 14 reduced. Based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).
| Company | Co-held by | Their position there |
|---|---|---|
| Meta Platforms Inc-Class AMETA | 112 funds | $88.6B |
| Nvidia CorpNVDA | 111 funds | $319.5B |
| Microsoft CorpMSFT | 111 funds | $219.8B |
| JPMorgan Chase & CoJPM | 111 funds | $48.2B |
| Eli Lilly & CoLLY | 110 funds | $71.1B |
| Amazon.com IncAMZN | 109 funds | $166.4B |
| Apple IncAAPL | 108 funds | $239.3B |
| Visa Inc-Class A SharesV | 108 funds | $48.6B |
| Bank Of America CorpBAC | 108 funds | $26.1B |
| Applied Materials IncAMAT | 108 funds | $26.0B |
| Newmont CorpNEM | 108 funds | $10.0B |
| Broadcom IncAVGO | 107 funds | $129.1B |
Ranked by how many of ROCK's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in ROCK.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| May 26, 2026 | Bosway William T | President and CEO, Director | Buy (P) | 20K | $739K |
| May 21, 2026 | Bolanowski Katherine | General Counsel, VP, Secretary | Buy (P) 2 lots, same day | 1K | $50K |
| May 20, 2026 | Lovechio Joseph A | VP and CFO | Buy (P) | 1K | $35K |
| Mar 13, 2026 | Bosway William T | President and CEO, Director | Buy (P) | 1K | $41K |
| Mar 10, 2026 | Bosway William T | President and CEO, Director | Buy (P) | 2K | $59K |
| Mar 10, 2026 | Metcalf James S | Director | Buy (P) | 12K | $502K |
| Mar 9, 2026 | Bosway William T | President and CEO, Director | Buy (P) | 5K | $172K |
| May 5, 2025 | Nish James B | Director | Sell (S) | 1K | $68K |
| May 2, 2025 | Nish James B | Director | Sell (S) 2 lots, same day | 3K | $154K |
| May 23, 2023 | Nish James B | Director | Sell (S) | 5K | $281K |
| May 20, 2022 | Myers Linda Kristine | Director | Buy (P) | 2K | $61K |
| Mar 1, 2022 | Myers Linda Kristine | Director | Buy (P) | 2K | $75K |
One row per insider, day and transaction code; shares and value are summed across the lots. Every lot is on the full insider page and in the filing.
Where institutional funds (13F), corporate insiders (Form 4) and US House members (STOCK Act) are buying or selling the same name in the same window. Green is buying, red is selling.
Insiders and Congress: last 180 days. Funds: latest 13F, top 100 holders incl. passive
| Source | Buying | Selling | Net |
|---|---|---|---|
13F funds Top 100 holders by value, passive included; the hero counts active managers only | 55 | 34 | – |
Insiders Form 4 open-market | 4 | 0 | +$1.4M |
US House STOCK Act trades | 0 | 0 | $0 |
Capital Rotation reports where institutional capital disclosed rotating, as of the latest public SEC 13F filings. It is data, not investment advice, a recommendation, or a prediction. Filings lag about 45 days and cover long US equity positions only. Past disclosed flows do not indicate future prices. Do your own research; consult a licensed advisor.
Connected entities for ROCK
This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/ROCK/capital-change-brief"
Use Arkolith's capital_change_brief for ROCK. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
13F holdings + Form 4 insider transactions + the live filing stream, joined for ROCK. Filings are public domain, sourced to SEC EDGAR.