Archimedes Tech SPAC Partners II Co.

ATII

Exchange: Nasdaq
Industry: Blank Checks
SEC CIK: 0002028516

SEC filings (opens in a new tab)

No open-market purchases or sales by Archimedes Tech SPAC Partners II Co. insiders were filed in the last 90 days; 50 institutions reported holding it in 13F filings for Q2 2026, worth $189.6M in total; no superinvestor holds it.

Other share classesATIIU ATIIW

Q2 2025 vs. Q1 2025

How the institutions holding Archimedes Tech SPAC Partners II Co. changed between Q1 2025 and Q2 2025.

All holders in Q2 2025 All holders in Q1 2025

13F holders of ATII: Q1 2025 compared with Q2 2025
Measure	Q1 2025	Q2 2025	Change
Holders	0	42	+42
Shares	0	21.1M	+21.1M
Value	$0	$216.0M	+$216.0M

New holders (42)

Institutions that held Archimedes Tech SPAC Partners II Co. at the end of Q2 2025 but not at the end of Q1 2025.

Institutions new to ATII in Q2 2025
Institution	Shares	Value	% of portfolio
Tenor Capital Management Co., L.P.	1,500,000	$15.3M	0.21%
Sculptor Capital LP	1,300,000	$13.3M	0.22%
Magnetar Financial LLC	1,300,000	$13.2M	0.06%
D. E. Shaw & Co., Inc.	1,138,500	$11.6M	0.01%
Linden Advisors LP	1,000,000	$10.2M	0.06%
CNH Partners LLC	969,382	$9.92M	0.23%
Glazer Capital, LLC	875,087	$8.95M	0.32%
LMR Partners LLP	850,000	$8.70M	0.14%
Ghisallo Capital Management LLC	800,000	$8.18M	0.22%
Alberta Investment Management Corp	750,000	$7.67M	0.06%
Governors Lane LP	750,000	$7.67M	1.05%
Two Sigma Investments, LP	725,000	$7.42M	0.01%
Hudson Bay Capital Management LP	700,000	$7.16M	0.05%
Driehaus Capital Management LLC	664,298	$6.80M	0.05%
Westchester Capital Management, LLC	650,000	$6.65M	0.39%
Picton Mahoney Asset Management	500,000	$5.12M	0.07%
Jain Global LLC	500,000	$5.12M	0.08%
Moore Capital Management, LP	450,000	$4.60M	0.09%
Periscope Capital Inc.	450,000	$4.60M	1.74%
Mizuho Securities USA LLC	455,000	$4.60M	0.10%
Commonwealth of Pennsylvania Public School Empls Retrmt Sys	400,000	$4.09M	0.02%
Toronto Dominion Bank	394,700	$4.04M	0.01%
Meteora Capital, LLC	392,530	$4.02M	0.75%
Radcliffe Capital Management, L.P.	326,920	$3.34M	0.26%
Goldman Sachs Group Inc	323,854	$3.31M	0.00%
Schonfeld Strategic Advisors LLC	320,000	$3.27M	0.02%
DLD Asset Management, LP	300,000	$3.07M	0.36%
Mint Tower Capital Management B.V.	300,000	$3.07M	0.47%
Centiva Capital, LP	285,515	$2.92M	0.19%
Verition Fund Management LLC	251,475	$2.57M	0.01%
Aristeia Capital LLC	250,000	$2.56M	0.07%
Whitebox Advisors LLC	250,000	$2.56M	0.07%
Berkley W R Corp	228,206	$2.33M	0.14%
UBS Oconnor LLC	200,000	$2.05M	0.06%
Shaolin Capital Management LLC	200,000	$2.05M	0.09%
K2 Principal Fund, L.P.	160,170	$1.64M	0.30%
Gritstone Asset Management LLC	100,000	$1.02M	1.01%
CSS LLC	50,000	$511.5K	0.03%
Clear Street LLC	37,534	$384.0K	0.00%
Wolverine Asset Management LLC	15,141	$154.9K	0.00%
Warberg Asset Management LLC	10,000	$102.3K	0.03%
Morgan Stanley	121	$1.24K	0.00%

Sold out (0)

Institutions that held Archimedes Tech SPAC Partners II Co. at the end of Q1 2025 and filed for Q2 2025 without it.

None.