Institutional HoldersBeta
Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.
Share classes (cover page of the 10-Q filed 2026-08-06, as of 2026-07-30)
| Class | Listed | Shares outstanding | Held by 13F filers | % of class | Holders | CUSIP |
|---|---|---|---|---|---|---|
| Common stock | MARA · NASDAQ | 386,299,297 | 280,159,837 | 72.5% | 415 | 565788106 |
Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.
Top holders (22 of 22 · 565788AH9)
change vs 2026-03-31| # | Filer | Shares / principal | % of class | Value | Change |
|---|---|---|---|---|---|
| 1 | ARISTEIA CAPITAL, L.L.C. | 88,044,000 | — | $85.6M | +40,300,000 (+84.4%) |
| 2 | Context Capital Management, LLC | 52,241,000 | — | $50.8M | +37,956,000 (+265.7%) |
| 3 | WHITEBOX ADVISORS LLC | 42,000,000 | — | $40.7M | -10,000,000 (-19.2%) |
| 4 | MILLENNIUM MANAGEMENT LLC | 19,945,000 | — | $19.2M | +14,520,000 (+267.6%) |
| 5 | MORGAN STANLEY | 14,395,000 | — | $13.9M | +560,000 (+4.0%) |
| 6 | Linden Advisors LP | 14,275,000 | — | $13.8M | NEW |
| 7 | CAPSTONE INVESTMENT ADVISORS, LLC | 9,000,000 | — | $8.8M | -1,000,000 (-10.0%) |
| 8 | MARSHALL WACE, LLP | 7,000,000 | — | $6.8M | -500,000 (-6.7%) |
| 9 | BlackRock, Inc. | 6,600,000 | — | $6.4M | -8,675,000 (-56.8%) |
| 10 | CITIGROUP INC | 6,005,000 | — | $5.8M | +825,000 (+15.9%) |
| 11 | Parallax Volatility Advisers, L.P. | 5,000,000 | — | $4.8M | — |
| 12 | CITADEL ADVISORS LLC | 5,000,000 | — | $4.9M | — |
| 13 | STATE STREET CORP | 4,600,000 | — | $4.4M | -14,600,000 (-76.0%) |
| 14 | FMR LLC | 3,584,000 | — | $3.5M | -6,680,000 (-65.1%) |
| 15 | Sculptor Capital LP | 2,500,000 | — | $2.4M | — |
| 16 | DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 2,000,000 | — | $1.9M | — |
| 17 | Greenland Capital Management LP | 2,000,000 | — | $1.9M | — |
| 18 | JPMORGAN CHASE & CO | 889,000 | — | $741K | +695,000 (+358.2%) |
| 19 | GOLDMAN SACHS GROUP INC | 150,000 | — | $145K | — |
| 20 | K2 PRINCIPAL FUND, L.P. | 9,000 | — | $8.7M | — |
| 21 | BARCLAYS PLC | 6,000 | — | $5K | NEW |
| 22 | Erste Asset Management GmbH | 0 | — | $0 | — |
Exited since 2026-03-31 (9 filers; largest 9 shown)
| AMERIPRISE FINANCIAL INC | −26,400,000 |
| Long Corridor Asset Management Ltd | −16,000,000 |
| DSC Meridian Capital LP | −11,506,000 |
| BANK OF AMERICA CORP /DE/ | −3,000,000 |
| STATE OF WISCONSIN INVESTMENT BOARD | −3,000,000 |
| JANE STREET GROUP, LLC | −2,000,000 |
| Man Group plc | −1,256,000 |
| SMH CAPITAL ADVISORS INC | −500,000 |
| Catalyst Capital Advisors LLC | −500,000 |
Large holders from 13D/13G (latest per reporting person, last 2 years)
Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.
| Reporting person | Form | Filed | Event | Shares | % of class |
|---|---|---|---|---|---|
| Vanguard Capital Management | SCHEDULE 13G | 2026-04-30 | 2026-03-31 | 19,211,414 | 5.05% |
| Vanguard Portfolio Management | SCHEDULE 13G | 2026-04-29 | 2026-03-31 | 26,585,326 | 6.99% |
| The Vanguard Group | SCHEDULE 13G/A | 2026-03-27 | 2026-03-13 | 0 | 0% |
| G1 Execution Services, LLC | SCHEDULE 13G/A | 2025-11-13 | 2025-09-30 | 18,825,520 | 4.9% |
| SIG Brokerage, LP | SCHEDULE 13G/A | 2025-11-13 | 2025-09-30 | 18,825,520 | 4.9% |
| Susquehanna Investment Group | SCHEDULE 13G/A | 2025-11-13 | 2025-09-30 | 18,825,520 | 4.9% |
| Susquehanna Securities, LLC | SCHEDULE 13G/A | 2025-11-13 | 2025-09-30 | 18,825,520 | 4.9% |
Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.