Among active 13F managers last quarter, 1 opened and 2 added, while 5 reduced; the largest holder to move was Berkley W R Corp (+15%). No open-market insider trades in the last 180 days.
Funds lean out and no leg opposes.
17 tracked 13F filers disclose a position in MACI as of the latest SEC 13F filings, a combined $55.4M 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 | Shares | Position value | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | Berkley W R Corp | 999K | $10.8M | ▲+15% Added · +130K sh | Q1 2026 | |
| 2 | Karpus Management, Inc. | 961K | $10.5M | ▼−2.8% Reduced · −27K sh | Q2 2026 | |
| 3 | Polar Asset Management Partners Inc. | 750K | $8.2M | ▼−49% Reduced · −735K sh | Q2 2026 | |
| 4 | LMR Partners LLP | 743K | $8.1M | ▼−50% Reduced · −743K sh | Q2 2026 | |
| 5 | D. E. Shaw & Co., Inc. | 576K | $6.2M | —Held | Q1 2026 | |
| 6 | Goldman Sachs Group Inc | 299K | $3.2M | —Held | Q1 2026 | |
| 7 | First Trust Capital Management L.P. | 240K | $2.6M | ▼−83% Reduced · −1.2M sh | Q2 2026 | |
| 8 | Toronto Dominion Bank | 184K | $2.0M | ▲+38% Added · +50K sh | Q1 2026 | |
| 9 | AQR Arbitrage LLC | 135K | $1.5M | ▼−86% Reduced · −861K sh | Q2 2026 | |
| 10 | Periscope Capital Inc. | 125K | $1.4M | —Held | Q2 2026 | |
| 11 | Dakota Wealth Management | 38K | $408K | —Held | Q2 2026 | |
| 12 | Geode Capital Management, LLC | 21K | $223K | —Held | Q2 2026 | |
| 13 | Tuttle Capital Management, LLC | 16K | $176K | ▲+7.7% Added · +1K sh | Q2 2026 | |
| 14 | Meteora Capital, LLC | 15K | $164K | ▲New +15K sh | Q2 2026 | |
| 15 | Clear Street Group Inc. | 10K | $111K | ▲New +10K sh | Q2 2026 | |
| 16 | Longfellow Investment Management Co LLC | 550 | $6K | —Held | Q2 2026 | |
| 17 | Morgan Stanley | 80 | $862 | ▲+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 5 reduced. 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 | Their position there |
|---|---|---|
| Lionheart Holdings - CL ACUB | 9 funds | $67.9M |
| K&F Growth Acquisition Cor-AKFII | 9 funds | $67.7M |
| Oyster Enterprises II Acq-AOYSE | 9 funds | $65.8M |
| Blue Water Acquisition C-ABLUW | 9 funds | $58.8M |
| Soulpower Acquisition Co-ASOUL | 9 funds | $55.8M |
| Wen Acquisition Corp-AWENN | 9 funds | $54.0M |
| Plum Acquisition Corp IVPLMK | 9 funds | $45.5M |
| D. Boral Arc Acquisit - CL ABCAR | 9 funds | $43.2M |
| Sizzle Acquisition Corp-CL ASZZL | 9 funds | $42.4M |
| Cantor Equity Partners VI -ACEPS | 9 funds | $14.2M |
| Agriculture & Natural SolutiANSC | 8 funds | $93.8M |
| Launch One Acquisition CorpLPAA | 8 funds | $88.2M |
Ranked by how many of MACI's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in MACI.
No open-market insider transactions on file yet. Grants, gifts, and exercises live on the full insider page.
Where institutional funds (13F), corporate insiders (Form 4) and US House members (STOCK Act) are buying or selling the same name in the same window. Green is buying, red is selling.
Insiders and Congress: last 180 days. Funds: latest 13F, top 100 holders incl. passive
| Source | Buying | Selling | Net |
|---|---|---|---|
13F funds Top 100 holders by value, passive included; the hero counts active managers only | 4 | 5 | – |
Insiders Form 4 open-market | 0 | 0 | $0 |
US House STOCK Act trades | 0 | 0 | $0 |
Capital Rotation reports where institutional capital disclosed rotating, as of the latest public SEC 13F filings. It is data, not investment advice, a recommendation, or a prediction. Filings lag about 45 days and cover long US equity positions only. Past disclosed flows do not indicate future prices. Do your own research; consult a licensed advisor.
| Class | 13F holders | Value held |
|---|---|---|
| MACIWWarrant | 30 funds | $1.1M |
| MACIthis pageSHS CL A | 17 funds | $55.4M |
| MACIUUNIT 06/10/2029 | 2 funds | $109K |
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.