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Archimedes Tech SPAC Partners III Co.

ARCIU
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; 15 institutions reported holding it in 13F filings for Q2 2026, worth $47.3M in total; no superinvestor holds it.

Other share classesARCIARCIW

Key figures

Insider buysOpen market, last 90 days
0
Insider sellsOpen market, last 90 days
0
13F holdersQ2 2026, −14 vs. previous quarter
15
13F valueReported value at the end of Q2 2026
$47.3M
Superinvestors holdingAt the end of Q2 2026
0

Price chart

Superinvestors holding ARCIU, Q2 2026

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No superinvestor reported holding ARCIU at the end of Q2 2026.

Latest insider trades

Open-market purchases and sales by Archimedes Tech SPAC Partners III Co. insiders from Form 4, newest first.

See all insider trades
Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Jan 26, 2026 (view filing)Jan 26Same dayArchimedes Tech SPAC Sponsors III LLC10% OwnerPPurchase+390.0K––New position390.0K afterDuplicate filing
Jan 26, 2026 (view filing)Jan 26Same dayArchimedes Tech SPAC Sponsors III LLC10% OwnerPPurchase+97.5K–––97.5K afterDerivativeDuplicate filing
Jan 26, 2026 (view filing)Jan 26Same dayLong LongChief Executive OfficerPPurchase+390.0K––New position390.0K after
Jan 26, 2026 (view filing)Jan 26Same dayLong LongChief Executive OfficerPPurchase+97.5K–––97.5K afterDerivative

Top 10 13F holders, Q2 2026

The largest institutional positions in Archimedes Tech SPAC Partners III Co. at the end of Q2 2026; share changes are against Q1 2026.

See all 15 holders
Institutions holding ARCIU in Q2 2026
InstitutionSharesValue% of portfolioChange in sharesAction
LMR Partners LLP1,250,000$12.7M0.09%00.0%Unchanged
Tudor Investment Corp Et Al650,000$6.62M0.03%00.0%Unchanged
Toronto Dominion Bank646,217$6.59M0.01%+396,217+158.5%Added
Omers Administration Corp480,000$4.89M0.03%00.0%Unchanged
Aristeia Capital LLC400,779$4.08M0.06%+989+0.2%Added
Lineage Point Capital LP288,776$3.01M0.62%+13,776+5.0%Added
BlueCrest Capital Management Ltd275,000$2.82M0.12%00.0%Unchanged
Millennium Management LLC179,743$1.83M0.00%−170,257−48.6%Reduced
Qube Research & Technologies Ltd150,000$1.54M0.00%00.0%Unchanged
Calamos Advisors LLC124,000$1.29M0.00%00.0%Unchanged