Vault-13

ARCHIMEDES TECH SPAC PTNRS I ARCI

ORD SHS · Common Stock · CUSIP G0453R105

52 institutional holders +12 vs Q1 2026
20,236,81520.2m shares reported held*
57.4% of all shares outstanding*
$202.6mreported value*
16 new 9 added 4 reduced 4 sold out net bought ≈ $46.8m (+4.7m 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. Shares outstanding: 35.3m as of 2026-08-12, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $10.01.

Trends to Q2 2026

Institutional holders

Managers reporting a position, each quarter

0204060Q1 26: 40Q2 26: 5252Q1 26Q2 26
Numbers
QuarterHolders
Q1 202640
Q2 202652

Biggest buyers

Alberta Investment Management Corp New +1,000,000+1.0m
AQR Arbitrage LLC New +757,612+757.6k
RIVERNORTH CAPITAL MANAGEMENT, LLC New +500,000+500.0k
BNP PARIBAS FINANCIAL MARKETS New +492,372+492.4k
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS New +400,000+400.0k
MMCAP International Inc. SPC New +300,000+300.0k
Schonfeld Strategic Advisors LLC New +297,404+297.4k
MANGROVE PARTNERS IM, LLC New +200,000+200.0k
Wealthspring Capital LLC New +160,960+161.0k
MILLENNIUM MANAGEMENT LLC New +150,000+150.0k

Biggest sellers

Alpine Global Management, LLC Sold out -150,000-150.0k
Clear Street Group Inc. Reduced -93,153-93.2k
Virtu Financial LLC Sold out -90,734-90.7k
Meteora Capital, LLC Reduced -59,251-59.3k
Parallax Volatility Advisers, L.P. Sold out -50,000-50.0k
Shaolin Capital Management LLC Reduced -30,068-30.1k
GLAZER CAPITAL, LLC Reduced -7,793-7.8k
ROYAL BANK OF CANADA Sold out -2,700-2.7k

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
Adage Capital Management, L.P. 13G · institution new · filed 2026-05-13 5.1% new 1.8m≈ $18.0m 2026-05-13

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
101Q4 24: 0 buyingQ4 24: 0 sellingQ1 25: 0 buyingQ1 25: 0 sellingQ1 25Q2 25: 0 buyingQ2 25: 0 sellingQ3 25: 0 buyingQ3 25: 0 sellingQ3 25Q4 25: 0 buyingQ4 25: 0 sellingQ1 26: 1 buyingQ1 26: 0 sellingQ1 26Q2 26: 0 buyingQ2 26: 0 sellingQ3 26: 0 buyingQ3 26: 0 sellingQ3 26
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q4 20240—0——
Q1 20250—0——
Q2 20250—0——
Q3 20250—0——
Q4 20250—0——
Q1 20261—0——
Q2 20260—0——
Q3 20260—0——

None reported since 1 Apr 2026.

Holders, Q2 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 ADAGE CAPITAL PARTNERS GP, L.L.C. 0.03% of their portfolio Boston, MA 1,800,0001.8m $18.0m $18.0m 0.03% Unchanged
2 Linden Advisors LP 0.06% of their portfolio New York, NY 1,200,0001.2m $12.0m $12.0m 0.06% Unchanged
3 Magnetar Financial LLC 0.11% of their portfolio EVANSTON, IL 1,200,0001.2m $12.0m $12.0m 0.11% Unchanged
4 Governors Lane LP 1.15% of their portfolio NEW YORK, NY 1,146,6101.1m $11.5m $11.5m 1.15% Added +146.6k +146,610
5 TENOR CAPITAL MANAGEMENT Co., L.P. 0.14% of their portfolio NEW YORK, NY 1,000,0001.0m $10.0m $10.0m 0.14% Unchanged
6 Alberta Investment Management Corp 0.06% of their portfolio EDMONTON, A0 1,000,0001.0m $10.0m $10.0m 0.06% New
7 Verition Fund Management LLC 0.06% of their portfolio GREENWICH, CT 815,355815.4k $8.2m $8.2m 0.06% Added +65.4k +65,355
8 SONA ASSET MANAGEMENT (US) LLC 0.30% of their portfolio NEW YORK, NY 800,000800.0k $8.0m $8.0m 0.30% Unchanged
9 AQR Arbitrage LLC 0.11% of their portfolio Greenwich, CT 757,612757.6k $7.6m $7.6m 0.11% New
10 HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND 0.01% of their portfolio TORONTO, A6 550,000550.0k $5.5m $5.5m 0.01% Unchanged
11 Shaolin Capital Management LLC 0.29% of their portfolio Miami, FL 510,386510.4k $5.1m $5.1m 0.29% Reduced -30.1k -30,068
12 Radcliffe Capital Management, L.P. 0.38% of their portfolio BALA CYNWYD, PA 504,673504.7k $5.1m $5.1m 0.38% Added +90.4k +90,376
13 Polar Asset Management Partners Inc. 0.09% of their portfolio TORONTO, A6 500,000500.0k $5.0m $5.0m 0.09% Unchanged
14 RIVERNORTH CAPITAL MANAGEMENT, LLC 0.24% of their portfolio WEST PALM BEACH, FL 500,000500.0k $5.1m $5.1m 0.24% New
15 MOORE CAPITAL MANAGEMENT, LP 0.11% of their portfolio NEW YORK, NY 500,000500.0k $5.0m $5.0m 0.11% Unchanged
16 GLAZER CAPITAL, LLC 0.12% of their portfolio New York, NY 496,809496.8k $5.0m $5.0m 0.12% Reduced -7.8k -7,793
17 BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio PARIS, I0 492,372492.4k $4.9m $4.9m 0.00% New
18 D. E. Shaw & Co., Inc. 0.00% of their portfolio New York, NY 450,500450.5k $4.5m $4.5m 0.00% Added +25.5k +25,500
19 Meteora Capital, LLC 0.35% of their portfolio Boca Raton, FL 424,489424.5k $4.2m $4.2m 0.35% Reduced -59.3k -59,251
20 Periscope Capital Inc. 0.65% of their portfolio Toronto, A6 409,001409.0k $4.1m $4.1m 0.65% Unchanged
21 COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS 0.02% of their portfolio HARRISBURG, PA 400,000400.0k $4.0m $4.0m 0.02% New
22 K2 PRINCIPAL FUND, L.P. 0.28% of their portfolio TORONTO, A6 308,333308.3k $3.1m $3.1m 0.28% Added +8.8k +8,797
23 MMCAP International Inc. SPC 0.25% of their portfolio GRAND CAYMAN, E9 300,000300.0k $3.0m $3.0m 0.25% New
24 Hudson Bay Capital Management LP 0.01% of their portfolio STAMFORD, CT 300,000300.0k $3.0m $3.0m 0.01% Unchanged
25 Schonfeld Strategic Advisors LLC 0.02% of their portfolio NEW YORK, NY 297,404297.4k $3.0m $3.0m 0.02% New
26 TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio NEW YORK, NY 273,791273.8k $2.7m $2.7m 0.00% Unchanged
27 HBK INVESTMENTS L P 0.03% of their portfolio DALLAS, TX 250,004250.0k $2.5m $2.5m 0.03% Unchanged
28 Ghisallo Capital Management LLC 0.05% of their portfolio BOSTON, MA 250,000250.0k $2.5m $2.5m 0.05% Unchanged
29 BERKLEY W R CORP 0.12% of their portfolio Greenwich, CT 248,000248.0k $2.5m $2.5m 0.12% Unchanged
30 683 Capital Management, LLC 0.18% of their portfolio NEW YORK, NY 200,000200.0k $2.0m $2.0m 0.18% Unchanged
31 MANGROVE PARTNERS IM, LLC 0.13% of their portfolio Greenwich, CT 200,000200.0k $2.0m $2.0m 0.13% New
32 First Trust Capital Management L.P. 0.12% of their portfolio CHICAGO, IL 200,000200.0k $2.0m $2.0m 0.12% Unchanged
33 TORONTO DOMINION BANK 0.00% of their portfolio TORONTO, ONTARIO, A6 175,916175.9k $1.8m $1.8m 0.00% Added +80.5k +80,518
34 DLD Asset Management, LP 0.14% of their portfolio NEW YORK, NY 170,000170.0k $1.7m $1.7m 0.14% Unchanged
35 Wealthspring Capital LLC 0.36% of their portfolio WEST HARRISON, NY 160,960161.0k $1.6m $1.6m 0.36% New
36 StoneX Group Inc. 0.06% of their portfolio NEW YORK, NY 150,309150.3k $1.5m $1.5m 0.06% Added +40.6k +40,564
37 MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio NEW YORK, NY 150,000150.0k $1.5m $1.5m 0.00% New
38 Mint Tower Capital Management B.V. 0.18% of their portfolio AMSTERDAM, P7 150,000150.0k $1.5m $1.5m 0.18% Unchanged
39 PICTON MAHONEY ASSET MANAGEMENT 0.01% of their portfolio Toronto, A6 149,996150.0k $1.5m $1.5m 0.01% New
40 Clear Street Group Inc. 0.00% of their portfolio NEW YORK, NY 147,610147.6k $1.5m $1.5m 0.00% Reduced -93.2k -93,153
41 WHITEBOX ADVISORS LLC 0.02% of their portfolio MINNEAPOLIS, MN 100,000100.0k $1.0m $1.0m 0.02% Unchanged
42 Context Capital Management, LLC 0.02% of their portfolio LAJOLLA, CA 100,000100.0k $1.0m $1.0m 0.02% Unchanged
43 BOOTHBAY FUND MANAGEMENT, LLC 0.02% of their portfolio NEW YORK, NY 95,00095.0k $951.0k $951.0k 0.02% New
44 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 87,66487.7k $876.6k $876.6k 0.00% Unchanged
45 L1 Global Manager Pty Ltd 0.61% of their portfolio Melbourne, C3 75,00075.0k $750.8k $750.8k 0.61% Unchanged
46 Centiva Capital, LP 0.02% of their portfolio New York, NY 70,05070.0k $701.2k $701.2k 0.02% New
47 Bulldog Investors, LLP 0.14% of their portfolio SADDLE BROOK, NJ 64,50064.5k $645.6k $645.6k 0.14% New
48 DELTEC ASSET MANAGEMENT LLC 0.05% of their portfolio New York, NY 35,00035.0k $350.4k $350.4k 0.05% Unchanged
49 ABC ARBITRAGE SA 0.04% of their portfolio PARIS, I0 35,00035.0k $350.4k $350.4k 0.04% New
50 WOLVERINE ASSET MANAGEMENT LLC 0.00% of their portfolio CHICAGO, IL 32,94732.9k $329.8k $329.8k 0.00% Added +22.9k +22,860
51 Arax Advisory Partners 0.00% of their portfolio NEW YORK, NY 1,5001.5k $15.0k $15.0k 0.00% New
52 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 2424 $240 $240 0.00% Added +7 +7