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ATIIW · Archimedes Tech SPAC Partners II Co. · Shareholders & Ownership

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$0.83 +0.11 (+15.92%) At close · Oct 21
Market Cap
$290.28M
Shares
29.59M
Volume · Oct 21 214.67K Avg daily vol (3M) 52.22K

Every disclosed holder of ATIIW in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

Who Owns ATIIW

13F quarter Jun 30, 2026; this listing alone: insiders and shares outstanding are issuer-wide, so they are left out

No chart: shares outstanding cannot be set against these holders.

Holder group Shares % Out
Institutional (13F) 8,366,999 —
Insiders (Forms 3, 4, 5) 0 —
13D/G-only blocks 0 —
Registered funds (N-PORT, not summed) 0 —

% Out is unavailable: shares outstanding is an issuer-wide count, not one listing's.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of ATIIW

# Holder Shares
1
Harraden Circle Investments, LLC
13F CIK 1910592 · Registered investment adviser · Jun 30, 2026
1,131,600
2
ARISTEIA CAPITAL, L.L.C.
13F CIK 1080171 · Registered investment adviser · Jun 30, 2026
788,491
3
TENOR CAPITAL MANAGEMENT Co., L.P.
13F CIK 1346554 · Registered investment adviser · Jun 30, 2026
750,000
4
LMR Partners LLP
13F CIK 1578621 · Exempt reporting adviser · Jun 30, 2026
613,701
5
Linden Advisors LP
13F CIK 1279396 · Registered investment adviser · Jun 30, 2026
504,138
6
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND
13F CIK 1535845 · Non-US institution · Jun 30, 2026
500,000
7
AQR Arbitrage LLC
13F CIK 1167456 · Registered investment adviser · Jun 30, 2026
481,366
8
Magnetar Financial LLC
13F CIK 1352851 · Registered investment adviser · Jun 30, 2026
437,600
9
Alberta Investment Management Corp
13F CIK 1463559 · Non-US institution · Jun 30, 2026
375,000
10
Decagon Asset Management LLP
13F CIK 1950677 · Unknown · Jun 30, 2026
331,302
11
D. E. Shaw & Co., Inc.
13F CIK 1009207 · Unknown · Jun 30, 2026
287,500
12
K2 PRINCIPAL FUND, L.P.
13F CIK 1461790 · Unknown · Jun 30, 2026
280,718
13
MOORE CAPITAL MANAGEMENT, LP
13F CIK 1448574 · Registered investment adviser · Jun 30, 2026
225,000
14
RIVERNORTH CAPITAL MANAGEMENT, LLC
13F CIK 1447578 · Registered investment adviser · Jun 30, 2026
224,942
15
Shaolin Capital Management LLC
13F CIK 1766806 · Registered investment adviser · Jun 30, 2026
181,640
16
BNP PARIBAS ARBITRAGE, SA
13F CIK 1166588 · Non-US institution · Jun 30, 2026
161,927
17
CSS LLC/IL
13F CIK 1103646 · Unknown · Jun 30, 2026
151,718
18
Sculptor Capital LP
13F CIK 1054587 · Registered investment adviser · Jun 30, 2026
150,200
19
Mint Tower Capital Management B.V.
13F CIK 1666606 · Unknown · Jun 30, 2026
130,000
20
WHITEBOX ADVISORS LLC
13F CIK 1257391 · Registered investment adviser · Jun 30, 2026
125,000
21
Alpine Global Management, LLC
13F CIK 1581655 · Unknown · Jun 30, 2026
71,039
22
DLD Asset Management, LP
13F CIK 1578299 · Registered investment adviser · Jun 30, 2026
69,400
23
MMCAP International Inc. SPC
13F CIK 1304857 · Unknown · Jun 30, 2026
62,500
24
Clear Street Group Inc.
13F CIK 1881567 · Unknown · Jun 30, 2026
60,000
25
SUSQUEHANNA INTERNATIONAL GROUP, LLP
13F CIK 1446194 · Unknown · Jun 30, 2026
48,825
26
Fort Baker Capital Management LP
13F CIK 1688382 · Registered investment adviser · Jun 30, 2026
41,177
27
Periscope Capital Inc.
13F CIK 1695320 · Exempt reporting adviser · Jun 30, 2026
40,000
28
Hudson Bay Capital Management LP
13F CIK 1393825 · Registered investment adviser · Jun 30, 2026
39,994
29
Lineage Point Capital LP
13F CIK 2093311 · Investment adviser · Jun 30, 2026
35,771
30
Centiva Capital, LP
13F CIK 1692507 · Registered investment adviser · Jun 30, 2026
31,450
31
Schonfeld Strategic Advisors LLC
13F CIK 1665241 · Registered investment adviser · Jun 30, 2026
30,000
32
Thomas J. Herzfeld Advisors, Inc.
13F CIK 1509510 · Registered investment adviser · Jun 30, 2026
5,000

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Key facts CIK 2028516 CUSIP G04537109 Visit website Investor relations