Archimedes Tech SPAC Partners II Co. - Ordinary shares, $0.0001 Par Value (ATIIU)

Q: What does CUSIP G04537117 represent in this 13F holders report?

CUSIP G04537117 is the security identifier for ATIIU - Archimedes Tech SPAC Partners II Co. - Ordinary shares, $0.0001 Par Value used to aggregate holder disclosures.

Q: How many institutions held ATIIU - Archimedes Tech SPAC Partners II Co. - Ordinary shares, $0.0001 Par Value in Q1 2026?

4 institutional investors reported ATIIU - Archimedes Tech SPAC Partners II Co. - Ordinary shares, $0.0001 Par Value for Q1 2026. Use the holders table for investor-level position and value details.

CUSIP: G04537117

Q1 2026 13F Holders as of 31 Mar 2026

Security type / class: Equity / Ordinary shares, $0.0001 Par Value
Total 13F shares: 108,387
Total 13F value: $1,180,534
Share change: -116,467
SEC-reported price per share: $10.90
Number of holders: 4
Value change: -$1,268,803
Number of sells: 3
Shares outstanding: 29,411,765

Security key

G04537117

Report period

Q1 2026

Institutions

Top holders

ATIIU full security history Ownership snapshot Full 13F holder table Previous quarter: Q4 2025 Archimedes Tech SPAC Partners II Co. SEC filings Archimedes Tech SPAC Partners II Co. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP G04537117

Previous quarter: Q4 2025

Recent filing periods:

Q1 2026 Q4 2025 Q3 2025

Ownership snapshot

Top reported holders of ATIIU - Archimedes Tech SPAC Partners II Co. - Ordinary shares, $0.0001 Par Value (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

TENOR CAPITAL MANAGEMENT ...

Disclosed value leader

TENOR CAPITAL MANAGEMENT ...

Comparable rows

15/15

Latest evidence

31 Dec 2025

13F 13D/G Lead comparable stake: 5.1% 13D/G row: TENOR CAPITAL MANAGEMENT Co., L.P. Showing 1-6 of 15 holder rows.

Quick read

TENOR CAPITAL MANAGEMENT Co., L.P. leads the comparable SEC ownership view at 5.1%.

15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens TENOR CAPITAL MANAGEMENT Co., L.P.'s linked filing trail.

Comparable ownership Top 5

TENOR CAPITAL MANAGEMENT Co., L.P. 5.1%

Sculptor Capital LP 4.4%

BARCLAYS PLC 3.9%

Ghisallo Capital Management LLC 2.7%

TWO SIGMA INVESTMENTS, LP 2.4%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-6 of 15 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
TENOR CAPITAL MANAGEMENT Co., L.P.	13F 13D/G Company · Tenor Capital Management Company, L.P. 13F 13D/G	5.1% from 13D/G	$15,951,825 2,250,000 shares mixed-class rows	—	31 Dec 2025
Sculptor Capital LP	13D/G 13F Company 13D/G 13F	4.4%	$13,585,000 1,300,000 shares	$0	30 Jun 2025
BARCLAYS PLC	13D/G 13D/G	3.9%	$11,899,392 1,148,590 shares	-$7,415,843	31 Dec 2025
Ghisallo Capital Management LLC	13F Company 13F	2.7%	$8,288,000 800,000 shares	—	31 Dec 2025
TWO SIGMA INVESTMENTS, LP	13F Company 13F	2.4%	$7,511,000 725,000 shares	—	31 Dec 2025
METEORA CAPITAL, LLC	13F Company 13F	2.4%	$7,442,966 718,433 shares	—	31 Dec 2025

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q1 2026

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

108,387

Rows available

Investor	Option	Weight %	Change %	SEC-reported value	* Price	Shares	Share Change	Activity	Report Period

^* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.

Compare Q1 2026 vs Q4 2025 Across Filers

Q4 2025 holders

Q1 2026 holders

Holder diff

Investor	Q4 2025 Shares	Q1 2026 Shares	Share Diff	Share Chg %	Q4 2025 value	Q1 2026 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend