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 (23 of 23 · 565788AD8)
change vs 2026-03-31| # | Filer | Shares / principal | % of class | Value | Change |
|---|---|---|---|---|---|
| 1 | WHITEBOX ADVISORS LLC | 49,950,000 | — | $55.5M | — |
| 2 | Linden Advisors LP | 48,600,000 | — | $54.1M | +19,500,000 (+67.0%) |
| 3 | Context Capital Management, LLC | 41,867,000 | — | $46.8M | +23,867,000 (+132.6%) |
| 4 | ARISTEIA CAPITAL, L.L.C. | 35,659,000 | — | $39.8M | NEW |
| 5 | Isabella Capital Management LLP | 25,000,000 | — | $28.0M | +11,500,000 (+85.2%) |
| 6 | ADVENT CAPITAL MANAGEMENT /DE/ | 16,348,000 | — | $18.4M | +3,659,000 (+28.8%) |
| 7 | CAPSTONE INVESTMENT ADVISORS, LLC | 13,327,000 | — | $14.9M | -13,000,000 (-49.4%) |
| 8 | Sculptor Capital LP | 10,000,000 | — | $11.1M | +5,000,000 (+100.0%) |
| 9 | CSS LLC/IL | 10,000,000 | — | $11.1M | -6,500,000 (-39.4%) |
| 10 | CITIGROUP INC | 9,591,000 | — | $10.7M | +8,162,000 (+571.2%) |
| 11 | TWO SIGMA INVESTMENTS, LP | 9,433,000 | — | $10.5M | +8,000,000 (+558.3%) |
| 12 | SSI INVESTMENT MANAGEMENT LLC | 8,754,000 | — | $9.7M | +6,225,000 (+246.1%) |
| 13 | Calamos Advisors LLC | 7,000,000 | — | $7.8M | — |
| 14 | BlackRock, Inc. | 5,925,000 | — | $6.6M | +1,275,000 (+27.4%) |
| 15 | FMR LLC | 3,125,000 | — | $3.5M | -13,120,000 (-80.8%) |
| 16 | MORGAN STANLEY | 2,320,000 | — | $2.6M | -100,000 (-4.1%) |
| 17 | Balyasny Asset Management L.P. | 1,000,000 | — | $1.1M | NEW |
| 18 | Central Pacific Bank - Trust Division | 583,000 | — | $648K | +449,000 (+335.1%) |
| 19 | GOLDMAN SACHS GROUP INC | 224,000 | — | $249K | — |
| 20 | Jefferies Financial Group Inc. | 221,000 | — | $244K | NEW |
| 21 | Ares Systematic Credit Ltd | 200,000 | — | $223K | NEW |
| 22 | JPMORGAN CHASE & CO | 115,000 | — | $131K | -35,000 (-23.3%) |
| 23 | SG Americas Securities, LLC | 18,500 | — | $2.0M | NEW |
Exited since 2026-03-31 (5 filers; largest 5 shown)
| WOLVERINE ASSET MANAGEMENT LLC | −32,820,000 |
| DLD Asset Management, LP | −30,000,000 |
| LMR Partners LLP | −15,000,000 |
| Point72 Asset Management, L.P. | −14,207,000 |
| JANE STREET GROUP, LLC | −275,000 |
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.