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 2026-08-13, as of 2026-08-13)
| Class | Listed | Shares outstanding | Held by 13F filers | % of class | Holders | CUSIP |
|---|---|---|---|---|---|---|
| Common Class A | MACI · NASDAQ | 9,545,544 | 5,158,110 | 54.0% | 17 | G6004G100 |
| Common Class B | not listed | 1 | — | — |
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 (32 of 32 · G6004G118)
change vs 2026-03-31Exited since 2026-03-31 (2 filers; largest 2 shown)
| Quarry LP | −23,558 |
| HRT FINANCIAL LP | −12,464 |
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 |
|---|---|---|---|---|---|
| LMR PARTNERS Ltd | SCHEDULE 13G/A | 2026-08-14 | 2026-06-30 | 742,500 | 7.8% |
| First Trust Capital Solutions L.P. | SCHEDULE 13G/A | 2026-08-14 | 2026-06-30 | 240,001 | 2.51% |
| LMR Partners AG | SCHEDULE 13G/A | 2026-08-14 | 2026-06-30 | 742,500 | 7.8% |
| LMR PARTNERS (DIFC) Ltd | SCHEDULE 13G/A | 2026-08-14 | 2026-06-30 | 742,500 | 7.8% |
| Stefan Renold | SCHEDULE 13G/A | 2026-08-14 | 2026-06-30 | 742,500 | 7.8% |
| FTCS Sub GP LLC | SCHEDULE 13G/A | 2026-08-14 | 2026-06-30 | 240,001 | 2.51% |
| Ben Levine | SCHEDULE 13G/A | 2026-08-14 | 2026-06-30 | 742,500 | 7.8% |
| LMR Partners LLC | SCHEDULE 13G/A | 2026-08-14 | 2026-06-30 | 742,500 | 7.8% |
| First Trust Capital Management L.P. | SCHEDULE 13G/A | 2026-08-14 | 2026-06-30 | 240,001 | 2.51% |
| LMR Partners LLP | SCHEDULE 13G/A | 2026-08-14 | 2026-06-30 | 742,500 | 7.8% |
| LMR Partners (Ireland) Limited | SCHEDULE 13G/A | 2026-08-14 | 2026-06-30 | 742,500 | 7.8% |
| AQR Arbitrage, LLC | SCHEDULE 13G/A | 2026-08-13 | 2026-06-30 | 135,133 | 3.44% |
| AQR Capital Management Holdings, LLC | SCHEDULE 13G/A | 2026-08-13 | 2026-06-30 | 135,133 | 3.44% |
| Mizuho Financial Group, Inc. | SCHEDULE 13G/A | 2026-08-13 | 2026-06-30 | 5 | 0% |
| AQR Capital Management, LLC | SCHEDULE 13G/A | 2026-08-13 | 2026-06-30 | 135,133 | 3.44% |
| Berkley Insurance Company | SCHEDULE 13G/A | 2026-08-06 | 2026-06-30 | 795,916 | 8.3% |
| W. R. Berkley Corporation | SCHEDULE 13G/A | 2026-08-06 | 2026-06-30 | 795,916 | 8.3% |
| KARPUS MANAGEMENT, INC. | SCHEDULE 13G | 2026-07-07 | 2026-06-30 | 961,303 | 10.07% |
| Wolverine Asset Management, LLC | SCHEDULE 13G/A | 2026-07-02 | 2026-06-17 | 0 | 0% |
| Wolverine Holdings, LLC | SCHEDULE 13G/A | 2026-07-02 | 2026-06-17 | 0 | 0% |
| Robert R. Bellick | SCHEDULE 13G/A | 2026-07-02 | 2026-06-17 | 0 | 0% |
| Christopher L. Gust | SCHEDULE 13G/A | 2026-07-02 | 2026-06-17 | 0 | 0% |
| Barclays PLC | SCHEDULE 13G/A | 2026-05-14 | 2026-03-31 | 576,328 | 3.6% |
| BMO NESBITT BURNS INC. | SCHEDULE 13G/A | 2026-01-08 | 2025-12-31 | 0 | 0% |
| Bank of Montreal | SCHEDULE 13G/A | 2026-01-08 | 2025-12-31 | 0 | 0% |
| BANK OF MONTREAL HOLDING INC. | SCHEDULE 13G/A | 2026-01-08 | 2025-12-31 | 0 | 0% |
| Wolverine Trading Partners, Inc. | SCHEDULE 13G | 2025-10-10 | 2025-09-30 | 926,328 | 5.79% |
| WOLVERINE ASSET MANAGEMENT LLC | SCHEDULE 13G | 2025-10-10 | 2025-09-30 | 926,328 | 5.79% |
| Wolverine Holdings, L.P. | SCHEDULE 13G | 2025-10-10 | 2025-09-30 | 926,328 | 5.79% |
| Meteora Capital, LLC | SCHEDULE 13G | 2025-08-14 | 2025-06-30 | 1,110,289 | 6.94% |
| GOLDMAN SACHS & CO. LLC | SCHEDULE 13G/A | 2025-05-09 | 2025-03-31 | 575,825 | 3.6% |
| THE GOLDMAN SACHS GROUP, INC. | SCHEDULE 13G/A | 2025-05-09 | 2025-03-31 | 575,825 | 3.6% |
| Highbridge Capital Management, LLC | SCHEDULE 13G/A | 2025-04-25 | 2025-03-31 | 0 | 0% |
| Eco Crown Global LLC | SCHEDULE 13G | 2025-02-13 | 2024-12-31 | 5,621,622 | 26% |
| Melar Capital SPAC Sponsor I LLC | SCHEDULE 13G | 2025-02-13 | 2024-12-31 | 5,621,622 | 26% |
| Melar Acquisition Sponsor I LLC | SCHEDULE 13G | 2025-02-13 | 2024-12-31 | 5,621,622 | 26% |
| Eric Lifshitz | SCHEDULE 13G | 2025-02-13 | 2024-12-31 | 5,621,622 | 26% |
| Gautam Ivatury | SCHEDULE 13G | 2025-02-13 | 2024-12-31 | 5,621,622 | 26% |
| SHAWN KIMEL INVESTMENTS, INC. | SCHEDULE 13G/A | 2025-02-11 | 2024-12-31 | 0 | 0% |
| The K2 Principal Fund, L.P. | SCHEDULE 13G/A | 2025-02-11 | 2024-12-31 | 0 | 0% |
| K2 & Associates Investment Management Inc. | SCHEDULE 13G/A | 2025-02-11 | 2024-12-31 | 0 | 0% |
| K2 Genpar 2017 Inc. | SCHEDULE 13G/A | 2025-02-11 | 2024-12-31 | 0 | 0% |
| Ramya Rao | SCHEDULE 13G/A | 2025-01-10 | 2024-09-30 | 800,000 | 5% |
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.