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Archimedes Tech SPAC Partners III Co.

ARCI
Exchange
Nasdaq
Industry
Blank Checks
SEC CIK
0002083910

No open-market purchases or sales by Archimedes Tech SPAC Partners III Co. insiders were filed in the last 90 days; 52 institutions reported holding it in 13F filings for Q2 2026, worth $202.6M in total; no superinvestor holds it.

Other share classesARCIUARCIW

13F holders, Q2 2026

Institutional positions in Archimedes Tech SPAC Partners III Co. as of Jun 30, 2026. 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
52
+12 vs. Q1 2026
Shares held
20.2M
+4.67M (+30.0%) vs. Q1 2026
Total value
$202.6M
+$49.3M (+32.2%) vs. Q1 2026
New holders
16
9 more added
Sold out
4
4 more reduced

Compare with Q1 2026: new holders, sold out and not filed yet

Holders and value by quarter

Institutions reporting ARCI 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.

Institutional holdersQ2 2026: 52 institutions
Q1 2021: 0 institutionsQ2 2021: 0 institutionsQ3 2021: 0 institutionsQ4 2021: 0 institutionsQ1 2022: 0 institutionsQ2 2022: 0 institutionsQ3 2022: 0 institutionsQ4 2022: 0 institutionsQ1 2023: 0 institutionsQ2 2023: 0 institutionsQ3 2023: 0 institutionsQ4 2023: 0 institutionsQ1 2024: 0 institutionsQ2 2024: 0 institutionsQ3 2024: 0 institutionsQ4 2024: 0 institutionsQ1 2025: 0 institutionsQ2 2025: 0 institutionsQ3 2025: 0 institutionsQ4 2025: 0 institutionsQ1 2026: 40 institutionsQ2 2026: 52 institutions
Value heldQ2 2026: $202.6M
Q1 2021: $0Q2 2021: $0Q3 2021: $0Q4 2021: $0Q1 2022: $0Q2 2022: $0Q3 2022: $0Q4 2022: $0Q1 2023: $0Q2 2023: $0Q3 2023: $0Q4 2023: $0Q1 2024: $0Q2 2024: $0Q3 2024: $0Q4 2024: $0Q1 2025: $0Q2 2025: $0Q3 2025: $0Q4 2025: $0Q1 2026: $153.3MQ2 2026: $202.6M
Institutions holding ARCI and their total value by quarter
QuarterHoldersValue
Q2 202652$202.6M
Q1 202640$153.3M
Q4 20250$0
Q3 20250$0
Q2 20250$0
Q1 20250$0
Q4 20240$0
Q3 20240$0
Q2 20240$0
Q1 20240$0
Q4 20230$0
Q3 20230$0
Q2 20230$0
Q1 20230$0
Q4 20220$0
Q3 20220$0
Q2 20220$0
Q1 20220$0
Q4 20210$0
Q3 20210$0
Q2 20210$0
Q1 20210$0

Institutions, Q2 2026

Shares, value and share of portfolio for each institution holding Archimedes Tech SPAC Partners III Co.; share changes are against Q1 2026.

Institutions holding ARCI in Q2 2026
InstitutionSharesValue% of portfolioChange in sharesAction
Adage Capital Partners GP, L.L.C.1,800,000$18.0M0.03%00.0%Unchanged
Linden Advisors LP1,200,000$12.0M0.06%00.0%Unchanged
Magnetar Financial LLC1,200,000$12.0M0.11%00.0%Unchanged
Governors Lane LP1,146,610$11.5M1.15%+146,610+14.7%Added
Tenor Capital Management Co., L.P.1,000,000$10.0M0.14%00.0%Unchanged
Alberta Investment Management Corp1,000,000$10.0M0.06%+1,000,000New
Verition Fund Management LLC815,355$8.16M0.06%+65,355+8.7%Added
Sona Asset Management (US) LLC800,000$8.01M0.30%00.0%Unchanged
CNH Partners LLC757,612$7.58M0.11%+757,612New
Healthcare of Ontario Pension Plan Trust Fund550,000$5.51M0.01%00.0%Unchanged
Shaolin Capital Management LLC510,386$5.11M0.29%−30,068−5.6%Reduced
Rivernorth Capital Management, LLC500,000$5.08M0.24%+500,000New
Radcliffe Capital Management, L.P.504,673$5.05M0.38%+90,376+21.8%Added
Polar Asset Management Partners Inc.500,000$5.00M0.09%00.0%Unchanged
Moore Capital Management, LP500,000$5.00M0.11%00.0%Unchanged
Glazer Capital, LLC496,809$4.97M0.12%−7,793−1.5%Reduced
BNP Paribas Arbitrage, SA492,372$4.93M0.00%+492,372New
D. E. Shaw & Co., Inc.450,500$4.51M0.00%+25,500+6.0%Added
Meteora Capital, LLC424,489$4.25M0.35%−59,251−12.2%Reduced
Periscope Capital Inc.409,001$4.09M0.65%00.0%Unchanged
Commonwealth of Pennsylvania Public School Empls Retrmt Sys400,000$4.00M0.02%+400,000New
K2 Principal Fund, L.P.308,333$3.09M0.28%+8,797+2.9%Added
Hudson Bay Capital Management LP300,000$3.00M0.01%00.0%Unchanged
MMCAP International Inc. SPC300,000$3.00M0.25%+300,000New
Schonfeld Strategic Advisors LLC297,404$2.98M0.02%+297,404New
Two Sigma Investments, LP273,791$2.74M0.00%00.0%Unchanged
HBK Investments L P250,004$2.50M0.03%00.0%Unchanged
Ghisallo Capital Management LLC250,000$2.50M0.05%00.0%Unchanged
Berkley W R Corp248,000$2.48M0.12%00.0%Unchanged
683 Capital Management, LLC200,000$2.00M0.18%00.0%Unchanged
Vivaldi Asset Management, LLC200,000$2.00M0.12%00.0%Unchanged
Mangrove Partners200,000$2.00M0.13%+200,000New
Toronto Dominion Bank175,916$1.76M0.00%+80,518+84.4%Added
DLD Asset Management, LP170,000$1.70M0.14%00.0%Unchanged
Wealthspring Capital LLC160,960$1.61M0.36%+160,960New
Mint Tower Capital Management B.V.150,000$1.50M0.18%00.0%Unchanged
Millennium Management LLC150,000$1.50M0.00%+150,000New
Picton Mahoney Asset Management149,996$1.50M0.01%+149,996New
StoneX Group Inc.150,309$1.50M0.06%+40,564+37.0%Added
Clear Street Group Inc.147,610$1.48M0.00%−93,153−38.7%Reduced
Whitebox Advisors LLC100,000$1.00M0.02%00.0%Unchanged
Context Capital Management, LLC100,000$1.00M0.02%00.0%Unchanged
Boothbay Fund Management, LLC95,000$951.0K0.02%+95,000New
JPMorgan Chase & Co87,664$876.6K0.00%00.0%Unchanged
L1 Global Manager Pty Ltd75,000$750.8K0.61%00.0%Unchanged
Centiva Capital, LP70,050$701.2K0.02%+70,050New
Bulldog Investors, LLP64,500$645.6K0.14%+64,500New
Deltec Asset Management LLC35,000$350.4K0.05%00.0%Unchanged
Abc Arbitrage SA35,000$350.4K0.04%+35,000New
Wolverine Asset Management LLC32,947$329.8K0.00%+22,860+226.6%Added
SRS Capital Advisors, Inc.1,500$15.0K0.00%+1,500New
Morgan Stanley24$2400.00%+7+41.2%Added
Alpine Global Management, LLC0$00.00%−150,000−100.0%Sold out
Virtu Financial LLC0$00.00%−90,734−100.0%Sold out
Parallax Volatility Advisers, L.P.0$00.00%−50,000−100.0%Sold out
Royal Bank of Canada0$00.00%−2,700−100.0%Sold out