176 tracked 13F filers disclose a position in ROCK as of the latest SEC 13F filings, a combined $1.2B 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 | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | $201.3M | 5.0M | ▲+1.6% Added · +78K sh | Q1 2026 | |
| 2 | FMR LLC | $176.7M | 4.4M | ▲+20% Added · +736K sh | Q1 2026 | |
| 3 | ALLIANCEBERNSTEIN L.P. | $108.7M | 2.2M | ▲+28% Added · +484K sh | Q1 2026 | |
| 4 | DIMENSIONAL FUND ADVISORS LP | $68.0M | 1.7M | ▲+0.4% Added · +7K sh | Q1 2026 | |
| 5 | STATE STREET CORP | $53.7M | 1.3M | ▼−1.3% Reduced · −17K sh | Q1 2026 | |
| 6 | VANGUARD PORTFOLIO MANAGEMENT LLC | $52.8M | 1.3M | →First observed position No prior filed position | Q1 2026 | |
| 7 | VANGUARD CAPITAL MANAGEMENT LLC | $52.7M | 1.3M | →First observed position No prior filed position | Q1 2026 | |
| 8 | BARROW HANLEY MEWHINNEY & STRAUSS LLC | $46.6M | 1.2M | ▲+19% Added · +184K sh | Q1 2026 | |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | $31.0M | 778K | ▲+5.4% Added · +40K sh | Q1 2026 | |
| 10 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $29.6M | 742K | ▲+52% Added · +255K sh | Q1 2026 | |
| 11 | FRONTIER CAPITAL MANAGEMENT CO LLC | $27.4M | 688K | ▲+26% Added · +141K sh | Q1 2026 | |
| 12 | Boston Partners | $27.3M | 687K | ▼−26% Reduced · −237K sh | Q1 2026 | |
| 13 | T. Rowe Price Investment Management, Inc. | Withheld | 467K | ▼−0.6% Reduced · −3K sh | Q1 2026 | |
| 14 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $17.6M | 440K | ▲~0% Added · +50 sh | Q1 2026 | |
| 15 | SEGALL BRYANT & HAMILL, LLC | $17.2M | 431K | ▲+22% Added · +77K sh | Q1 2026 | |
| 16 | MORGAN STANLEY | $14.4M | 362K | ▼−17% Reduced · −72K sh | Q1 2026 | |
| 17 | PALISADE CAPITAL MANAGEMENT, LP | $14.3M | 359K | ▼−4.5% Reduced · −17K sh | Q1 2026 | |
| 18 | NORTHERN TRUST CORP | $13.3M | 334K | ▲+3.6% Added · +12K sh | Q1 2026 | |
| 19 | D. E. Shaw & Co., Inc. | $10.0M | 250K | ▼−22% Reduced · −70K sh | Q1 2026 | |
| 20 | KENNEDY CAPITAL MANAGEMENT LLC | $9.9M | 247K | ▼−1.5% Reduced · −4K sh | Q1 2026 | |
| 21 | UBS Group AG | $7.9M | 197K | ▲+197% Added · +131K sh | Q1 2026 | |
| 22 | GOLDMAN SACHS GROUP INC | $7.8M | 195K | ▲+8.1% Added · +15K sh | Q1 2026 | |
| 23 | VANGUARD FIDUCIARY TRUST CO | $7.7M | 194K | →First observed position No prior filed position | Q1 2026 | |
| 24 | PRINCIPAL FINANCIAL GROUP INC | $7.4M | 186K | ▲+8.3% Added · +14K sh | Q1 2026 | |
| 25 | Invenomic Capital Management LP | $7.3M | 183K | ▲New +183K sh | Q1 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.
Last quarter, 7 funds opened a new position in ROCK and 25 added to an existing one, while 17 reduced and 0 exited entirely — 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 | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 79 funds | $35.7B |
| AMAZON.COM INCAMZN | 79 funds | $29.6B |
| ADVANCED MICRO DEVICESAMD | 79 funds | $5.2B |
| NVIDIA CORPNVDA | 78 funds | $53.9B |
| APPLE INCAAPL | 78 funds | $42.1B |
| BROADCOM INCAVGO | 78 funds | $20.0B |
| META PLATFORMS INC-CLASS AMETA | 78 funds | $16.3B |
| ALPHABET INC-CL AGOOGL | 77 funds | $23.5B |
| ELI LILLY & COLLY | 77 funds | $9.8B |
| VISA INC-CLASS A SHARESV | 76 funds | $7.6B |
| APPLIED MATERIALS INCAMAT | 76 funds | $5.3B |
| LAM RESEARCH CORPLRCX | 76 funds | $4.5B |
Ranked by how many of ROCK's institutional holders also hold each name, a cross-fund conviction signal.
| 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) | 1K | $45K |
| May 21, 2026 | Bolanowski Katherine | General Counsel, VP, Secretary | Buy (P) | 144 | $5K |
| 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) | 1K | $58K |
| May 2, 2025 | Nish James B | Director | Sell (S) | 2K | $96K |
| May 23, 2023 | Nish James B | Director | Sell (S) | 5K | $281K |
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 + end-of-day price history + the live filing stream, joined for ROCK. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.