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 (17 of 17 · G6004G100)
change vs 2026-03-31| # | Filer | Shares | % of class | Value | Change |
|---|---|---|---|---|---|
| 1 | MIZUHO SECURITIES USA LLC | 1,250,727 | 13.10% | $13.4M | — |
| 2 | Karpus Management, Inc. | 961,303 | 10.07% | $10.5M | -27,202 (-2.8%) |
| 3 | BERKLEY W R CORP | 795,916 | 8.34% | $8.7M | -203,047 (-20.3%) |
| 4 | Polar Asset Management Partners Inc. | 750,000 | 7.86% | $8.2M | -735,000 (-49.5%) |
| 5 | LMR Partners LLP | 742,500 | 7.78% | $8.1M | -742,500 (-50.0%) |
| 6 | First Trust Capital Management L.P. | 240,001 | 2.51% | $2.6M | -1,159,999 (-82.9%) |
| 7 | AQR Arbitrage LLC | 135,133 | 1.42% | $1.5M | -861,366 (-86.4%) |
| 8 | Periscope Capital Inc. | 125,000 | 1.31% | $1.4M | — |
| 9 | GOLDMAN SACHS GROUP INC | 44,867 | 0.47% | $488K | -254,464 (-85.0%) |
| 10 | Dakota Wealth Management | 37,500 | 0.39% | $408K | — |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | 20,514 | 0.21% | $223K | — |
| 12 | Tuttle Capital Management, LLC | 16,154 | 0.17% | $176K | +1,154 (+7.7%) |
| 13 | Meteora Capital, LLC | 15,119 | 0.16% | $164K | NEW |
| 14 | JPMORGAN CHASE & CO | 12,586 | 0.13% | $137K | NEW |
| 15 | Clear Street Group Inc. | 10,175 | 0.11% | $111K | NEW |
| 16 | LONGFELLOW INVESTMENT MANAGEMENT CO LLC | 550 | 0.01% | $6K | — |
| 17 | MORGAN STANLEY | 65 | 0.00% | $707 | -15 (-18.8%) |
Exited since 2026-03-31 (23 filers; largest 23 shown)
| WOLVERINE ASSET MANAGEMENT LLC | −1,026,683 |
| D. E. Shaw & Co., Inc. | −576,328 |
| Cable Car Capital, LP | −492,500 |
| Wealthspring Capital LLC | −447,964 |
| Radcliffe Capital Management, L.P. | −426,939 |
| Westchester Capital Management, LLC | −424,707 |
| GLAZER CAPITAL, LLC | −398,589 |
| Magnetar Financial LLC | −371,250 |
| Crossingbridge Advisors, LLC | −355,236 |
| L1 Global Manager Pty Ltd | −335,000 |
| PICTON MAHONEY ASSET MANAGEMENT | −325,000 |
| Hudson Bay Capital Management LP | −325,000 |
| Alberta Investment Management Corp | −325,000 |
| RIVERNORTH CAPITAL MANAGEMENT, LLC | −299,140 |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC | −288,804 |
| RiverPark Advisors, LLC | −225,333 |
| TORONTO DOMINION BANK | −183,612 |
| DELTEC ASSET MANAGEMENT LLC | −100,000 |
| MOORE CAPITAL MANAGEMENT, LP | −75,000 |
| HEIGHTS CAPITAL MANAGEMENT, INC | −34,755 |
| HRT FINANCIAL LP | −10,000 |
| Quarry LP | −11 |
| RLH Capital LLC | −11 |
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.