Among active 13F managers last quarter, 7 opened and 3 added, while 16 reduced; the largest holder to move was Tenor Capital Management Co., L.P. (−8.8%). No open-market insider trades in the last 180 days.
Funds lean out and no leg opposes.
44 tracked 13F filers disclose a position in ATII as of the latest SEC 13F filings, a combined $196.1M 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 | Tenor Capital Management Co., L.P. | 1.4M | $14.7M | ▼−8.8% Reduced · −132K sh | Q2 2026 | |
| 2 | Fort Baker Capital Management LP | 1.3M | $14.3M | ▲New +1.3M sh | Q2 2026 | |
| 3 | Magnetar Financial LLC | 1.3M | $14.0M | ▼−0.2% Reduced · −3K sh | Q2 2026 | |
| 4 | D. E. Shaw & Co., Inc. | 1.1M | $11.9M | —Held | Q1 2026 | |
| 5 | Linden Advisors LP | 1.0M | $10.4M | —Held | Q1 2026 | |
| 6 | Decagon Asset Management LLP | 938K | $10.1M | ▲New +938K sh | Q2 2026 | |
| 7 | Ghisallo Capital Management LLC | 800K | $8.6M | —Held | Q2 2026 | |
| 8 | Two Sigma Investments, LP | 725K | $7.5M | —Held | Q1 2026 | |
| 9 | Hudson Bay Capital Management LP | 700K | $7.5M | —Held | Q2 2026 | |
| 10 | Toronto Dominion Bank | 650K | $6.8M | ▲+333% Added · +500K sh | Q1 2026 | |
| 11 | Shay Capital LLC | 624K | $6.7M | ▲New +624K sh | Q2 2026 | |
| 12 | Governors Lane LP | 605K | $6.5M | ▼−20% Reduced · −155K sh | Q2 2026 | |
| 13 | AQR Arbitrage LLC | 590K | $6.4M | ▼−36% Reduced · −330K sh | Q2 2026 | |
| 14 | Sculptor Capital LP | 553K | $6.0M | ▼−8.0% Reduced · −48K sh | Q2 2026 | |
| 15 | K2 Principal Fund, L.P. | 526K | $5.7M | ▲+499% Added · +438K sh | Q2 2026 | |
| 16 | LMR Partners LLP | 479K | $5.2M | ▼−44% Reduced · −371K sh | Q2 2026 | |
| 17 | Radcliffe Capital Management, L.P. | 478K | $5.2M | ▼−28% Reduced · −183K sh | Q2 2026 | |
| 18 | Moore Capital Management, LP | 450K | $4.9M | —Held | Q2 2026 | |
| 19 | Alberta Investment Management Corp | 400K | $4.3M | ▼−47% Reduced · −350K sh | Q2 2026 | |
| 20 | Commonwealth Of Pennsylvania Public School Empls Retrmt Sys | 400K | $4.2M | —Held | Q1 2026 | |
| 21 | Goldman Sachs Group Inc | 327K | $3.4M | ▲+1.1% Added · +4K sh | Q1 2026 | |
| 22 | Millennium Management LLC | 308K | $3.2M | —Held | Q1 2026 | |
| 23 | Citadel Advisors LLC | 250K | $2.7M | ▲24× Added · +240K sh | Q2 2026 | |
| 24 | Whitebox Advisors LLC | 250K | $2.7M | —Held | Q2 2026 | |
| 25 | Harraden Circle Investments, LLC | 235K | $2.5M | ▲New +235K 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, 7 funds opened a new position in ATII and 3 added to an existing one, while 16 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 |
|---|---|---|
| Cantor Equity Partners-CL ACEPF | 31 funds | $208.3M |
| Cantor Equity Partners-CL ACEPV | 31 funds | $114.6M |
| Viking Acquisition Corp - AVACI | 30 funds | $127.6M |
| Eqv Ventures Acquisition C-AEVAC | 28 funds | $213.6M |
| Newhold Investment Cor III-ANHIC | 28 funds | $127.7M |
| Gores Holdings X Inc-CL AGTEN | 27 funds | $228.4M |
| Aldel Financial II IncALDF | 27 funds | $166.3M |
| Cantor Equity Partners VI -ACEPS | 27 funds | $45.5M |
| Bleichroeder Acquis II-CL ABBCQ | 26 funds | $182.3M |
| Perimeter Acquis Corp I CL APMTR | 26 funds | $165.8M |
| Blue Water Acquisition C-ABLUW | 26 funds | $151.3M |
| Cohen Circle Acquisit II - ACCII | 26 funds | $146.9M |
Ranked by how many of ATII's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in ATII.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Feb 12, 2025 | Long Long | Chief Executive Officer, Director, 10% Owner | Buy (P) | 530K | — |
| Feb 12, 2025 | Archimedes Tech SPAC Sponsors II LLC | 10% Owner | Buy (P) | 530K | — |
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 | 18 | – |
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 |
|---|---|---|
| ATIIthis pageORDSH | 44 funds | $196.1M |
| ATIIWWarrant | 32 funds | $15.6M |
| ATIIUUNIT 10/15/2029 | 4 funds | $1.2M |
Same issuer, multiple share classes. The consensus leaderboards count this company once across all classes; this is the per-class detail.
Connected entities for ATII
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/ATII/capital-change-brief"
Use Arkolith's capital_change_brief for ATII. 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 ATII. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.