# ARCHIMEDES TECH SPAC PARTNER (ATII)

> Institutional ownership reported to the SEC as of Q2 2026, from Form 13F filings. Source: https://holderbook.com/stocks/ATII/

- Reporting holders: 50
- Reported value: $193.0M
- Shares held by institutions: 17,903,695 of 29,590,000 outstanding
- Held through calls: 0.0%
- Held through puts: 0.0%

A 13F reports long US equity positions only. Shorts, bonds, foreign listings and cash are not visible here, and positions are disclosed up to 45 days after the quarter ends.

## Largest holders

| Manager | Value | Shares | Share of their book | Quarters held |
|---|---|---|---|---|
| [TENOR CAPITAL MANAGEMENT Co., L.P.](https://holderbook.com/funds/1346554-tenor-capital-management-co-l-p/) | $14.7M | 1,367,830 | 0.2% | 5 |
| [Fort Baker Capital Management LP](https://holderbook.com/funds/1688382-fort-baker-capital-management-lp/) | $14.3M | 1,330,746 | 1.0% | 1 |
| [Magnetar Financial LLC](https://holderbook.com/funds/1352851-magnetar-financial-llc/) | $14.0M | 1,297,302 | 0.1% | 5 |
| [D. E. Shaw & Co., Inc.](https://holderbook.com/funds/1009207-d-e-shaw-co-inc/) | $12.3M | 1,138,500 | 0.0% | 5 |
| [Decagon Asset Management LLP](https://holderbook.com/funds/1950677-decagon-asset-management-llp/) | $10.1M | 937,829 | 1.9% | 1 |
| [Linden Advisors LP](https://holderbook.com/funds/1279396-linden-advisors-lp/) | $9.1M | 848,273 | 0.0% | 5 |
| [Ghisallo Capital Management LLC](https://holderbook.com/funds/1825214-ghisallo-capital-management-llc/) | $8.6M | 800,000 | 0.2% | 5 |
| [TWO SIGMA INVESTMENTS, LP](https://holderbook.com/funds/1179392-two-sigma-investments-lp/) | $7.8M | 725,000 | 0.0% | 5 |
| [Hudson Bay Capital Management LP](https://holderbook.com/funds/1393825-hudson-bay-capital-management-lp/) | $7.5M | 700,000 | 0.0% | 5 |
| [Shay Capital LLC](https://holderbook.com/funds/1723643-shay-capital-llc/) | $6.7M | 623,687 | 0.4% | 1 |
| [Governors Lane LP](https://holderbook.com/funds/1644187-governors-lane-lp/) | $6.5M | 604,857 | 0.5% | 5 |
| [AQR Arbitrage LLC](https://holderbook.com/funds/1167456-aqr-arbitrage-llc/) | $6.4M | 590,262 | 0.1% | 5 |
| [Sculptor Capital LP](https://holderbook.com/funds/1054587-sculptor-capital-lp/) | $6.0M | 552,619 | 0.0% | 5 |
| [K2 PRINCIPAL FUND, L.P.](https://holderbook.com/funds/1461790-k2-principal-fund-l-p/) | $5.7M | 526,227 | 0.4% | 5 |
| [CITADEL ADVISORS LLC](https://holderbook.com/funds/1423053-citadel-advisors-llc/) | $5.4M | 500,532 | 0.0% | 2 |
| [LMR Partners LLP](https://holderbook.com/funds/1578621-lmr-partners-llp/) | $5.2M | 478,978 | 0.0% | 5 |
| [Radcliffe Capital Management, L.P.](https://holderbook.com/funds/1218275-radcliffe-capital-management-l-p/) | $5.2M | 478,061 | 0.4% | 5 |
| [MOORE CAPITAL MANAGEMENT, LP](https://holderbook.com/funds/1448574-moore-capital-management-lp/) | $4.9M | 450,000 | 0.1% | 5 |
| [Alberta Investment Management Corp](https://holderbook.com/funds/1463559-alberta-investment-management-corp/) | $4.3M | 400,000 | 0.0% | 5 |
| [FNY Investment Advisers, LLC](https://holderbook.com/funds/1742998-fny-investment-advisers-llc/) | $3.5M | 327,200 | 1.3% | 1 |
| [Mint Tower Capital Management B.V.](https://holderbook.com/funds/1666606-mint-tower-capital-management-b-v/) | $3.2M | 300,000 | 0.4% | 5 |
| [Verition Fund Management LLC](https://holderbook.com/funds/1454027-verition-fund-management-llc/) | $3.0M | 281,594 | 0.0% | 5 |
| [WHITEBOX ADVISORS LLC](https://holderbook.com/funds/1257391-whitebox-advisors-llc/) | $2.7M | 250,000 | 0.0% | 5 |
| [Harraden Circle Investments, LLC](https://holderbook.com/funds/1910592-harraden-circle-investments-llc/) | $2.5M | 234,661 | 0.3% | 1 |
| [GOLDMAN SACHS GROUP INC](https://holderbook.com/funds/886982-goldman-sachs-group-inc/) | $2.2M | 205,090 | 0.0% | 5 |

## Quarter by quarter

| Quarter | Holders | Reported value |
|---|---|---|
| Q2 2026 | 50 | $193.0M |
| Q1 2026 | 54 | $231.3M |
| Q4 2025 | 49 | $230.4M |
| Q3 2025 | 46 | $225.0M |
| Q2 2025 | 42 | $216.0M |