Archimedes Tech SPAC Partners ATIIW Institutional Ownership

NASDAQ ATIIW

$1.56 +0.06 (+3.99%)

As of: Aug 21, 2026 · 3:58 PM EDT

Institutions by Trading Activity

38 Institutions

Increased 8 21.1%

Unchanged 24 63.2%

Reduced 6 15.8%

Ownership Statistics

13F · as of 31 Mar, 2026

Institutional Ownership

50.56%

▼-1.59 pp QoQ

Shares Held by Institutions

10.26Mn

of 20.29Mn outstanding

▲+1.30% QoQ

Shares Outstanding

20.29Mn

10.03Mn held outside 13F filers

Institutional Investors

filed 13F for Mar 2026

▲+2 vs prior quarter

Net Shares Added (QoQ)

+131.39K

accumulated since last quarter

Value of Holdings

$14.77Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 31 Mar, 2026

Archimedes Tech SPAC Partners II Co. (NASDAQ:ATIIW) has 38 institutional investors that have filed 13F reports for the period ending March 2026.

These investors held 50.6% of outstanding shares in March 2026, down from 52.1% in December 2025.
Their total shares held in ATIIW increased 1.3% from the prior quarter, while the number of investors in Archimedes Tech SPAC Partners stayed flat year over year.
Among the 38 funds, 8 bought more Archimedes Tech SPAC Partners shares, 6 sold down, and 24 held their ground.
Institutional investors collectively held 10.26Mn shares in Archimedes Tech SPAC Partners as of March 2026, up by 131.39K shares quarter on quarter, and with no net change year over year.
Harraden Circle Investments, LLC holds the largest position in ATIIW at 1.61Mn shares as of March 31, 2026, or 7.93% of shares outstanding.
Leading buyers of Archimedes Tech SPAC Partners shares for the quarter ending March 2026 were Toronto Dominion Bank (515.4K), K2 PRINCIPAL FUND, L.P. (239.9K), Lineage Point Capital LP (87.69K), RLH Capital LLC (47.38K), Clear Street Group Inc. (40.38K).
The biggest sellers of Archimedes Tech SPAC Partners for the quarter ending March 2026 included Alberta Investment Management Corp (375.0K), DLD Asset Management, LP (241.9K), Harraden Circle Investments, LLC (125.0K), CSS LLC/IL (52.81K), GLAZER CAPITAL, LLC (30.15K).
Per Business Quant, the top 10 investors in ATIIW for the quarter ending March 2026 include Harraden Circle Investments, LLC (1.61Mn), LINDEN ADVISORS LP (860.96K), TENOR CAPITAL MANAGEMENT Co., L.P. (750.0K), Magnetar Financial LLC (650.0K), Toronto Dominion Bank (554.67K), HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND (500.0K), Shaolin Capital Management LLC (500.0K), CSS LLC/IL (487.62K), AQR Arbitrage LLC (479.21K), LMR Partners LLP (425.0K).

Form 13F Holdings

38 Institutional Holders

Report period 31 Mar, 2026

Total shares held 10.26Mn

Of outstanding 50.56%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	Harraden Circle Investments, LLC	0001910592	1,609,715	7.93%	▼125,000	-7.21%	$820.96K
2	LINDEN ADVISORS LP	0001279396	860,962	4.24%	0	0.00%	$378.82K
3	TENOR CAPITAL MANAGEMENT Co., L.P.	0001346554	750,000	3.70%	0	0.00%	$382.50K
4	Magnetar Financial LLC	0001352851	650,000	3.20%	0	0.00%	$331.50K
5	Toronto Dominion Bank	0000947263	554,674	2.73%	▲515,405	+1,312.50%	$282.88K
6	HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND	0001535845	500,000	2.46%	0	0.00%	$255.00K
6	Shaolin Capital Management LLC	0001766806	500,000	2.46%	0	0.00%	$255.00K
7	CSS LLC/IL	0001103646	487,619	2.40%	▼52,807	-9.77%	$248.69K
8	AQR Arbitrage LLC	0001167456	479,208	2.36%	▼10,483	-2.14%	$244.40K
9	LMR Partners LLP	0001578621	425,000	2.09%	0	0.00%	$216.75K
10	Alberta Investment Management Corp	0001463559	375,000	1.85%	▼375,000	-50.00%	$191.25K
11	D. E. Shaw & Co., Inc.	0001009207	287,500	1.42%	0	0.00%	$146.63K
12	K2 PRINCIPAL FUND, L.P.	0001461790	239,895	1.18%	▲239,895	0.00%	$122.35K
13	MOORE CAPITAL MANAGEMENT, LP	0001448574	225,000	1.11%	0	0.00%	$114.75K
14	RIVERNORTH CAPITAL MANAGEMENT, LLC	0001447578	224,942	1.11%	0	0.00%	$114.72K
15	Westchester Capital Management, LLC	0001512805	199,999	0.99%	0	0.00%	$102.00K
16	PERISCOPE CAPITAL INC.	0001695320	198,600	0.98%	0	0.00%	$101.29K
17	Governors Lane LP	0001644187	197,403	0.97%	0	0.00%	$100.68K
18	BNP PARIBAS FINANCIAL MARKETS	0001166588	161,927	0.80%	0	0.00%	$82.58K
19	Clear Street Group Inc.	0001881567	153,619	0.76%	▲40,379	+35.66%	$78.35K

Showing 1 to 20 of 38 holders