26 tracked 13F filers disclose a position in MACI as of the latest SEC 13F filings, a combined $131.6M 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 | LMR Partners LLP | $16.0M | 1.5M | —Held | Q1 2026 | |
| 2 | Polar Asset Management Partners Inc. | $16.0M | 1.5M | —Held | Q1 2026 | |
| 3 | First Trust Capital Management L.P. | $15.1M | 1.4M | —Held | Q1 2026 | |
| 4 | BERKLEY W R CORP | $10.8M | 999K | ▲+15% Added · +130K sh | Q1 2026 | |
| 5 | AQR Arbitrage LLC | $10.8M | 996K | ▼−0.1% Reduced · −680 sh | Q1 2026 | |
| 6 | Karpus Management, Inc. | $10.6M | 989K | ▼−14% Reduced · −157K sh | Q1 2026 | |
| 7 | D. E. Shaw & Co., Inc. | $6.2M | 576K | —Held | Q1 2026 | |
| 8 | Cable Car Capital, LP | $5.3M | 493K | —Held | Q1 2026 | |
| 9 | Radcliffe Capital Management, L.P. | $4.6M | 427K | —Held | Q1 2026 | |
| 10 | Westchester Capital Management, LLC | $4.6M | 425K | —Held | Q1 2026 | |
| 11 | Magnetar Financial LLC | $4.0M | 371K | —Held | Q1 2026 | |
| 12 | L1 Global Manager Pty Ltd | $3.6M | 335K | —Held | Q1 2026 | |
| 13 | Hudson Bay Capital Management LP | $3.5M | 325K | —Held | Q1 2026 | |
| 14 | Alberta Investment Management Corp | $3.5M | 325K | —Held | Q1 2026 | |
| 15 | PICTON MAHONEY ASSET MANAGEMENT | $3.5M | 325K | —Held | Q1 2026 | |
| 16 | GOLDMAN SACHS GROUP INC | $3.2M | 299K | —Held | Q1 2026 | |
| 17 | RIVERNORTH CAPITAL MANAGEMENT, LLC | $3.2M | 299K | —Held | Q1 2026 | |
| 18 | HIGHBRIDGE CAPITAL MANAGEMENT LLC | $3.1M | 289K | ▲New +289K sh | Q1 2026 | |
| 19 | TORONTO DOMINION BANK | $2.0M | 184K | ▲+38% Added · +50K sh | Q1 2026 | |
| 20 | MOORE CAPITAL MANAGEMENT, LP | $808K | 75K | —Held | Q1 2026 | |
| 21 | Dakota Wealth Management | $404K | 38K | —Held | Q1 2026 | |
| 22 | HEIGHTS CAPITAL MANAGEMENT, INC | $375K | 35K | ▼−33% Reduced · −17K sh | Q1 2026 | |
| 23 | GEODE CAPITAL MANAGEMENT, LLC | $221K | 21K | —Held | Q1 2026 | |
| 24 | Tuttle Capital Management, LLC | $176K | 16K | ▲+7.7% Added · +1K sh | Q2 2026 | |
| 25 | MORGAN STANLEY | $862 | 80 | ▲+31% Added · +19 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, 1 fund opened a new position in MACI and 2 added to an existing one, while 3 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 |
|---|---|---|
| K&F GROWTH ACQUISITION COR-AKFII | 18 funds | $148.2M |
| ANDRETTI ACQUISITION CORP -APOLE | 18 funds | $142.8M |
| SOULPOWER ACQUISITION CO-ASOUL | 18 funds | $122.7M |
| LEGATO MERGER CORP IIILEGT | 17 funds | $144.1M |
| MOUNTAIN LAKE ACQUISITION-AMLAC | 17 funds | $131.4M |
| NEW PROVIDENCE ACQUISITION-ANPAC | 17 funds | $118.8M |
| OYSTER ENTERPRISES II ACQ-AOYSE | 17 funds | $117.9M |
| TRANSLATIONAL DEVELOPMENT ACTDAC | 17 funds | $91.0M |
| PLUM ACQUISITION CORP IVPLMK | 17 funds | $85.1M |
| CSLM DIGITAL ASSET ACQU - AKOYN | 17 funds | $76.4M |
| REPUBLIC DIGITAL ACQUIS-CL ARDAG | 17 funds | $75.6M |
| CANTOR EQUITY PARTNERS-CL ACEPV | 17 funds | $68.6M |
Ranked by how many of MACI's institutional holders also hold each name, a cross-fund conviction signal.
No open-market insider transactions on file yet. Grants, gifts, and exercises live on the full insider page.
| Class | 13F holders | Value held |
|---|---|---|
| MACIthis pageSHS CL A | 26 funds | $131.6M |
| MACIWWarrant | 26 funds | $961K |
| MACIUUNIT 06/10/2029 | 2 funds | $37K |
Same issuer, multiple share classes. The consensus leaderboards count this company once across all classes; this is the per-class detail.
Connected entities for MACI
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/MACI/capital-change-brief"
Use Arkolith's capital_change_brief for MACI. 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 MACI. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.