ARCHIMEDES TECH SPAC PTNRS I ARCIU
UNIT 01/23/2031 · Unit · CUSIP G0453R121
- SectorBlank check (SPAC)
- IndustryBlank Checks
- HeadquartersClaymont, DE
- FilingsSEC EDGAR
15
institutional holders
-14 vs Q1 2026
4.6m
shares reported held*
$47.3mreported value*
1 new
6 added
1 reduced
15 sold out
net sold ≈ $45.6m (-4.5m shares)
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Implied quarter-end price ≈ $10.22.
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q1 2026 | 29 |
| Q2 2026 | 15 |
Biggest buyers
| TORONTO DOMINION BANK | Added | +396.2k |
| Clear Street Group Inc. | Added | +24.2k |
| Lineage Point Capital LP | Added | +13.8k |
| GLAZER CAPITAL, LLC | New | +10.5k |
| ARISTEIA CAPITAL, L.L.C. | Added | +989 |
| Tuttle Capital Management, LLC | Added | +769 |
| HRT FINANCIAL LP | Added | +4 |
Biggest sellers
| Alberta Investment Management Corp | Sold out | -1.0m |
| AQR Arbitrage LLC | Sold out | -757.6k |
| Lighthouse Investment Partners, LLC | Sold out | -500.0k |
| RIVERNORTH CAPITAL MANAGEMENT, LLC | Sold out | -500.0k |
| BNP PARIBAS FINANCIAL MARKETS | Sold out | -492.4k |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS | Sold out | -400.0k |
| MMCAP International Inc. SPC | Sold out | -300.0k |
| Schonfeld Strategic Advisors LLC | Sold out | -236.4k |
| MILLENNIUM MANAGEMENT LLC | Reduced | -170.3k |
| Wealthspring Capital LLC | Sold out | -166.5k |
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
BuyingSelling
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 0 | — | 0 | — | — |
| Q1 2025 | 0 | — | 0 | — | — |
| Q2 2025 | 0 | — | 0 | — | — |
| Q3 2025 | 0 | — | 0 | — | — |
| Q4 2025 | 0 | — | 0 | — | — |
| Q1 2026 | 1 | — | 0 | — | — |
| Q2 2026 | 0 | — | 0 | — | — |
| Q3 2026 | 0 | — | 0 | — | — |
None reported since 1 Apr 2026.
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| LMR Partners LLP 0.09% of their portfolio | 1.2m $12.7m | Unchanged |
| TUDOR INVESTMENT CORP ET AL 0.03% of their portfolio | 650.0k $6.6m | Unchanged |
| TORONTO DOMINION BANK 0.01% of their portfolio | 646.2k $6.6m | Added +396.2k |
| OMERS ADMINISTRATION Corp 0.03% of their portfolio | 480.0k $4.9m | Unchanged |
| ARISTEIA CAPITAL, L.L.C. 0.06% of their portfolio | 400.8k $4.1m | Added +989 |
| Lineage Point Capital LP 0.62% of their portfolio | 288.8k $3.0m | Added +13.8k |
| BlueCrest Capital Management Ltd 0.12% of their portfolio | 275.0k $2.8m | Unchanged |
| MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio | 179.7k $1.8m | Reduced -170.3k |
| Qube Research & Technologies Ltd 0.00% of their portfolio | 150.0k $1.5m | Unchanged |
| Calamos Advisors LLC 0.00% of their portfolio | 124.0k $1.3m | Unchanged |
| Westchester Capital Management, LLC 0.05% of their portfolio | 100.0k $1.0m | Unchanged |
| Clear Street Group Inc. 0.00% of their portfolio | 34.3k $349.1k | Added +24.2k |
| HRT FINANCIAL LP 0.00% of their portfolio | 25.0k $256.0k | Added +4 |
| Tuttle Capital Management, LLC 0.07% of their portfolio | 10.8k $109.4k | Added +769 |
| GLAZER CAPITAL, LLC 0.00% of their portfolio | 10.5k $110.0k | New |