Question 1

What percentage of ATII is owned by institutions?

Accepted Answer

Based on Q1 2026 13F filings, institutional ownership of Archimedes Tech SPAC Partners II Co. Ordinary Shares stands at 66.4%, held across 53 reporting institutions.

Question 2

Who is the largest institutional holder of ATII?

Accepted Answer

TENOR CAPITAL MANAGEMENT Co., L.P. is the largest reported institutional holder of ATII, with approximately 1,500,000 shares worth $0.02B as of Q1 2026.

Question 3

Is ATII a hedge fund favorite?

Accepted Answer

Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of ATII, including TWO SIGMA INVESTMENTS, LP, MILLENNIUM MANAGEMENT LLC.

Question 4

What is ATII's Smart Money Score?

Accepted Answer

Our composite Smart Money Score for ATII is 55 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.

Question 5

How many institutions bought ATII this quarter?

Accepted Answer

8 institutions opened new positions in ATII during Q1 2026, while 4 fully exited. 35 added to existing positions and 10 trimmed.

Question 6

How is institutional ownership of ATII changing?

Accepted Answer

ATII institutional ownership fell by 0.85 percentage points quarter-over-quarter, with a net change of +4 holders.

Question 7

How concentrated is ATII ownership among the top holders?

Accepted Answer

The top 10 institutions account for 48.0% of all reported 13F value in ATII, and the top 25 account for 83.1%.

Question 8

Where does this ATII institutional ownership data come from?

Accepted Answer

All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.

#	Institution	Shares Held	Market Value	QoQ Change	Ownership %	% of Fund
1	TENOR CAPITAL MANAGEMENT Co., L.P.	1.5M	$15.6M	0.0%	5.069%	0.24%
2	Magnetar Financial LLC	1.3M	$13.6M	0.0%	4.393%	0.14%
3	D. E. Shaw & Co., Inc.	1.1M	$11.9M	0.0%	3.848%	0.01%
4	LINDEN ADVISORS LP	1.0M	$10.4M	0.0%	3.379%	0.06%
5	CNH PARTNERS LLC	921K	$9.6M	-4.5%	3.111%	0.16%
6	Westchester Capital Management, LLC	907K	$9.4M	0.0%	3.066%	0.45%
7	LMR Partners LLP	850K	$8.8M	0.0%	2.873%	0.07%
8	Ghisallo Capital Management LLC	800K	$8.3M	0.0%	2.704%	0.23%
9	Governors Lane LP	760K	$7.9M	+0.1%	2.567%	0.77%
10	Alberta Investment Management Corp	750K	$7.8M	0.0%	2.535%	0.05%
11	TWO SIGMA INVESTMENTS, LP	725K	$7.5M	0.0%	2.450%	0.01%
12	Hudson Bay Capital Management LP	700K	$7.3M	0.0%	2.366%	0.08%
13	Radcliffe Capital Management, L.P.	661K	$6.9M	+0.5%	2.235%	0.52%
14	TORONTO DOMINION BANK	650K	$6.8M	+333.3%	2.197%	0.01%
15	Sculptor Capital LP	601K	$6.3M	0.0%	2.030%	0.07%
16	Jain Global LLC	500K	$5.2M	0.0%	1.690%	0.03%
17	PICTON MAHONEY ASSET MANAGEMENT	500K	$5.2M	0.0%	1.690%	0.05%
18	MOORE CAPITAL MANAGEMENT, LP	450K	$4.7M	0.0%	1.521%	0.11%
19	RIVERNORTH CAPITAL MANAGEMENT, LLC	428K	$4.5M	-4.5%	1.445%	0.22%
20	COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS	400K	$4.2M	0.0%	1.352%	0.02%
21	J. Goldman & Co LP	370K	$3.8M	—	1.250%	0.12%
22	PERISCOPE CAPITAL INC.	353K	$3.7M	-21.3%	1.193%	0.64%
23	GOLDMAN SACHS GROUP INC	327K	$3.4M	+1.1%	1.107%	0.00%
24	MILLENNIUM MANAGEMENT LLC	308K	$3.2M	0.0%	1.041%	0.00%
25	METEORA CAPITAL, LLC	296K	$3.1M	-58.9%	0.999%	0.23%

Quarter	Inst. Holders	Δ Holders	Ownership %	Δ Ownership	Total 13F Value	Δ Value
Q1 2026	53	+8.2%	66.36%	0.85 pp	$216M	1.3%
Q4 2025	49	+8.9%	67.21%	+3.86 pp	$218M	+6.1%
Q3 2025	45	+4.7%	63.35%	+2.13 pp	$206M	+3.5%
Q2 2025	43	—	61.22%	—	$199M	—

Archimedes Tech SPAC Partners II Co. Ordinary Shares (ATII) Institutional Ownership

AI Insights & Key Takeaways

Top Institutional Holders of ATII

Quarterly Institutional Activity

ATII Institutional Ownership by Quarter

ATII — Frequently Asked Questions