Among active 13F managers last quarter, 15 opened and 5 added, while 2 reduced; the largest holder to move was Adage Capital Partners GP, L.L.C. (new position). No open-market insider trades in the last 180 days.
Funds lean in and no leg opposes.
44 tracked 13F filers disclose a position in ARCI as of the latest SEC 13F filings, a combined $172.3M 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 | Adage Capital Partners GP, L.L.C. | 1.8M | $17.7M | ▲New +1.8M sh | Q1 2026 | |
| 2 | Magnetar Financial LLC | 1.2M | $12.0M | —Held | Q2 2026 | |
| 3 | Linden Advisors LP | 1.2M | $11.8M | ▲New +1.2M sh | Q1 2026 | |
| 4 | Governors Lane LP | 1.1M | $11.5M | ▲+15% Added · +147K sh | Q2 2026 | |
| 5 | Alberta Investment Management Corp | 1.0M | $10.0M | ▲New +1.0M sh | Q2 2026 | |
| 6 | Tenor Capital Management Co., L.P. | 1.0M | $10.0M | —Held | Q2 2026 | |
| 7 | Verition Fund Management LLC | 815K | $8.2M | ▲+8.7% Added · +65K sh | Q2 2026 | |
| 8 | AQR Arbitrage LLC | 758K | $7.6M | ▲New +758K sh | Q2 2026 | |
| 9 | Healthcare Of Ontario Pension Plan Trust Fund | 550K | $5.4M | ▲New +550K sh | Q1 2026 | |
| 10 | Shaolin Capital Management LLC | 510K | $5.1M | ▼−5.6% Reduced · −30K sh | Q2 2026 | |
| 11 | Radcliffe Capital Management, L.P. | 505K | $5.1M | ▲+22% Added · +90K sh | Q2 2026 | |
| 12 | Rivernorth Capital Management, LLC | 500K | $5.1M | ▲New +500K sh | Q2 2026 | |
| 13 | Polar Asset Management Partners Inc. | 500K | $5.0M | —Held | Q2 2026 | |
| 14 | Moore Capital Management, LP | 500K | $5.0M | —Held | Q2 2026 | |
| 15 | D. E. Shaw & Co., Inc. | 425K | $4.2M | ▲New +425K sh | Q1 2026 | |
| 16 | Meteora Capital, LLC | 424K | $4.2M | ▼−12% Reduced · −59K sh | Q2 2026 | |
| 17 | Periscope Capital Inc. | 409K | $4.1M | —Held | Q2 2026 | |
| 18 | K2 Principal Fund, L.P. | 308K | $3.1M | ▲+2.9% Added · +9K sh | Q2 2026 | |
| 19 | Hudson Bay Capital Management LP | 300K | $3.0M | —Held | Q2 2026 | |
| 20 | Schonfeld Strategic Advisors LLC | 297K | $3.0M | ▲New +297K sh | Q2 2026 | |
| 21 | Two Sigma Investments, LP | 274K | $2.7M | ▲New +274K sh | Q1 2026 | |
| 22 | HBK Investments L P | 250K | $2.5M | —Held | Q2 2026 | |
| 23 | Ghisallo Capital Management LLC | 250K | $2.5M | —Held | Q2 2026 | |
| 24 | Berkley W R Corp | 248K | $2.4M | ▲New +248K sh | Q1 2026 | |
| 25 | Mangrove Partners Im, LLC | 200K | $2.0M | ▲New +200K sh | Q2 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, 15 funds opened a new position in ARCI and 5 added to an existing one, while 2 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 |
|---|---|---|
| Crane Harbor Acquisitio-CL ACRAN | 32 funds | $201.9M |
| Cantor Equity Partners-CL ACEPF | 32 funds | $189.2M |
| Cantor Equity Partners-CL ACEPV | 32 funds | $112.8M |
| Eqv Ventures Acquisition C-AEVAC | 30 funds | $233.2M |
| Krakacquisition Corp-CL AKRAQ | 30 funds | $193.9M |
| M3-Brigade Acquisition-CL AMBVI | 30 funds | $177.1M |
| M Evo Global Acquisitio-CL AMEVO | 30 funds | $168.5M |
| Blue Water Acquisition C-ABLUW | 30 funds | $144.4M |
| Pioneer Acquisition I-CL APACH | 30 funds | $130.3M |
| Spring Valley Acquisitio-ASVIV | 30 funds | $119.1M |
| Republic Digital Acquis-CL ARDAG | 29 funds | $168.7M |
| Meshflow Acquisition Co-CL AMESH | 29 funds | $168.0M |
Ranked by how many of ARCI's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in ARCI.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Jan 26, 2026 | Long Long | Chief Executive Officer, Director, 10% Owner | Buy (P) | 390K | — |
| Jan 26, 2026 | Archimedes Tech SPAC Sponsors III LLC | 10% Owner | Buy (P) | 390K | — |
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 | 5 | 3 | – |
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 |
|---|---|---|
| ARCIthis pageORD SHS | 44 funds | $172.3M |
| ARCIWWarrant | 34 funds | $3.0M |
| ARCIUUnit | 14 funds | $48.5M |
Same issuer, multiple share classes. The consensus leaderboards count this company once across all classes; this is the per-class detail.
Connected entities for ARCI
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/ARCI/capital-change-brief"
Use Arkolith's capital_change_brief for ARCI. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
13F holdings + Form 4 insider transactions + the live filing stream, joined for ARCI. Filings are public domain, sourced to SEC EDGAR.