ATII — Archimedes Tech SPAC Partners II Co.
Price · 2025-04-03 → 2026-08-21
348 daily closes shownAnonymous view is capped at two years of history. A free account extends it to five, and Pro opens the whole archive back to 2025-04-03.
Performance
Technicals
Measured signals that fired on ATII
| date | signal | measured base rate |
|---|---|---|
| 2026-08-03 | Equal lows taken out structure | -0.64% over 21 days · t = -4.75 · n = 55,661 statistically distinguishable from its control group |
| 2026-05-20 | Breakout to a 52-week high price | -1.00% over 21 days · t = -8.58 · n = 24,386 statistically distinguishable from its control group |
| 2026-05-15 | Volume shock without a price move price | -1.33% over 21 days · t = -4.53 · n = 16,432 statistically distinguishable from its control group |
Excess return against a matched control group, on a point-in-time universe that includes delisted companies. Most families do not survive that. How the measurement works →
Insider transactions (Form 4)
| date | insider | what | shares | price | value |
|---|---|---|---|---|---|
| 2025-02-12 | Archimedes Tech SPAC Sponsors II LLC | Open-market purchase | 530.0K | — | — |
| 2025-02-12 | Long Long Chief Executive Officer | Open-market purchase | 530.0K | — | — |
Open-market purchases (code P) are the informative ones. Grants, option exercises and tax withholding are compensation mechanics, not decisions. How to read a Form 4 →
Largest institutional holders
| manager | value | shares |
|---|---|---|
| TENOR CAPITAL MANAGEMENT Co., L.P. | 15.6M | 1.5M |
| Magnetar Financial LLC | 13.6M | 1.3M |
| D. E. Shaw & Co., Inc. | 11.9M | 1.1M |
| Linden Advisors LP | 10.4M | 1.0M |
| AQR Arbitrage LLC | 9.6M | 920.7K |
| Westchester Capital Management, LLC | 9.4M | 907.1K |
| LMR Partners LLP | 8.8M | 850.0K |
| Ghisallo Capital Management LLC | 8.3M | 800.0K |
| Governors Lane LP | 7.9M | 759.6K |
| Alberta Investment Management Corp | 7.8M | 750.0K |
13F positions as of 2026-03-31, filed up to 45 days after quarter end. Long-only US equity — shorts and derivatives never appear. What 13F does and does not show →
Short selling
This is off-exchange short volume, not short interest: it is flow, not position, and 40–50% is normal because market makers short to fill your buy. Why that number misleads →
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