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Livermore
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Archimedes Tech SPAC Partners II Co.

ATIIU
Exchange
Nasdaq
Industry
Blank Checks
SEC CIK
0002028516

No open-market purchases or sales by Archimedes Tech SPAC Partners II Co. insiders were filed in the last 90 days; 4 institutions reported holding it in 13F filings for Q2 2026, worth $1.32M in total; no superinvestor holds it.

Other share classesATIIATIIW

Q1 2025 vs. Q4 2024

How the institutions holding Archimedes Tech SPAC Partners II Co. changed between Q4 2024 and Q1 2025.

All holders in Q1 2025All holders in Q4 2024

13F holders of ATIIU: Q4 2024 compared with Q1 2025
MeasureQ4 2024Q1 2025Change
Holders044+44
Shares019.3M+19.3M
Value$0$194.1M+$194.1M

New holders (44)

Institutions that held Archimedes Tech SPAC Partners II Co. at the end of Q1 2025 but not at the end of Q4 2024.

Institutions new to ATIIU in Q1 2025
InstitutionSharesValue% of portfolio
Tenor Capital Management Co., L.P.1,500,000$15.2M0.22%
CNH Partners LLC1,303,242$13.1M0.32%
Magnetar Financial LLC1,300,000$13.1M0.17%
Healthcare of Ontario Pension Plan Trust Fund1,000,000$10.1M0.02%
Linden Advisors LP1,000,000$10.1M0.07%
LMR Partners LLP850,000$8.56M0.17%
Glazer Capital, LLC839,370$8.46M0.39%
CSS LLC820,803$8.27M0.58%
Ghisallo Capital Management LLC800,000$8.06M0.70%
Two Sigma Investments, LP725,000$7.31M0.02%
Hudson Bay Capital Management LP700,000$7.07M0.04%
Shaolin Capital Management LLC650,531$6.55M0.27%
Mizuho Securities USA LLC600,000$6.01M0.13%
D. E. Shaw & Co., Inc.575,000$5.81M0.01%
JPMorgan Chase & Co543,595$5.49M0.00%
Millennium Management LLC500,000$5.04M0.00%
Moore Capital Management, LP450,000$4.54M0.15%
Rivernorth Capital Management, LLC450,000$4.54M0.24%
Westchester Capital Management, LLC400,000$4.03M0.23%
Schonfeld Strategic Advisors LLC350,000$3.53M0.02%
K2 Principal Fund, L.P.319,790$3.22M0.49%
Periscope Capital Inc.300,000$3.03M1.69%
Mint Tower Capital Management B.V.300,000$3.02M1.12%
Verition Fund Management LLC291,500$2.94M0.02%
Aristeia Capital LLC250,000$2.52M0.08%
Picton Mahoney Asset Management250,000$2.52M0.09%
Crossingbridge Advisors, LLC250,000$2.52M1.34%
Whitebox Advisors LLC250,000$2.52M0.08%
Berkley W R Corp228,206$2.30M0.17%
Boothbay Fund Management, LLC218,600$2.21M0.08%
Atw Spac Management LLC218,600$2.20M3.67%
Clear Street LLC166,517$1.68M0.03%
Centiva Capital, LP150,000$1.51M0.09%
DLD Asset Management, LP150,000$1.51M0.22%
MMCAP International Inc. SPC125,000$1.26M0.21%
Parallax Volatility Advisers, L.P.100,000$1.01M0.03%
Gritstone Asset Management LLC100,000$1.01M1.06%
Wealthspring Capital LLC77,376$780.0K1.20%
Jane Street Group, LLC65,110$657.0K0.00%
Wolverine Asset Management LLC25,900$260.8K0.01%
Highbridge Capital Management LLC25,000$252.5K0.01%
Tuttle Tactical Management20,000$201.4K0.88%
Warberg Asset Management LLC10,000$100.9K0.03%
UBS Group AG1,000$10.1K0.00%

Sold out (0)

Institutions that held Archimedes Tech SPAC Partners II Co. at the end of Q4 2024 and filed for Q1 2025 without it.

None.