Archimedes Tech SPAC Partners II Co.
ATIIU- Exchange
- Nasdaq
- Industry
- Blank Checks
- SEC CIK
- 0002028516
No open-market purchases or sales by Archimedes Tech SPAC Partners II Co. insiders were filed in the last 90 days; 4 institutions reported holding it in 13F filings for Q2 2026, worth $1.32M in total; no superinvestor holds it.
13F holders, Q3 2025
Institutional positions in Archimedes Tech SPAC Partners II Co. as of Sep 30, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 6
- −2 vs. Q2 2025
- Shares held
- 318.5K
- −965.7K (−75.2%) vs. Q2 2025
- Total value
- $3.46M
- −$9.73M (−73.7%) vs. Q2 2025
- New holders
- 1
- 0 more added
- Sold out
- 3
- 2 more reduced
1 institution that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting ATIIU on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 4 | $1.32M |
| Q1 2026 | 5 | $1.18M |
| Q4 2025 | 4 | $2.37M |
| Q3 2025 | 6 | $3.46M |
| Q2 2025 | 9 | $13.4M |
| Q1 2025 | 44 | $194.1M |
| Q4 2024 | 0 | $0 |
| Q3 2024 | 0 | $0 |
| Q2 2024 | 0 | $0 |
| Q1 2024 | 0 | $0 |
| Q4 2023 | 0 | $0 |
| Q3 2023 | 0 | $0 |
| Q2 2023 | 0 | $0 |
| Q1 2023 | 0 | $0 |
| Q4 2022 | 0 | $0 |
| Q3 2022 | 0 | $0 |
| Q2 2022 | 0 | $0 |
| Q1 2022 | 0 | $0 |
| Q4 2021 | 0 | $0 |
| Q3 2021 | 0 | $0 |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q3 2025
Shares, value and share of portfolio for each institution holding Archimedes Tech SPAC Partners II Co.; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| JPMorgan Chase & Co | 138,380 | $1.43M | 0.00% | 00.0% | Unchanged |
| Rivernorth Capital Management, LLC | 92,135 | $939.8K | 0.05% | −357,865−79.5% | Reduced |
| Jane Street Group, LLC | 46,071 | $579.1K | 0.00% | −589−1.3% | Reduced |
| Clear Street Group Inc. | 37,766 | $474.7K | 0.00% | +37,766 | New |
| UBS Group AG | 4,130 | $42.1K | 0.00% | 00.0% | Unchanged |
| Toronto Dominion Bank | 1 | $13 | 0.00% | 00.0% | Unchanged |
| Millennium Management LLC | 0 | $0 | 0.00% | −500,000−100.0% | Sold out |
| MMCAP International Inc. SPC | 0 | $0 | 0.00% | −125,000−100.0% | Sold out |
| Tuttle Tactical Management | 0 | $0 | 0.00% | −20,000−100.0% | Sold out |
| Clear Street LLC | – | – | – | – | Not filed |