Archimedes Tech SPAC Partners II Co. - ATII

Detailed investor-level table based on 13F positions.

Shareholders (13F)

Quarter: Q4 2025 · Compare: Q3 2025
13D/13G major owners: Ownership tab.
Methodology: Market value and % of portfolio use SEC reported VALUE ($000). For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received. Details.
Rows: 0
Investor History Status Shares held Market value ($000) % of portfolio Previous % Rank Change in shares % change in shares Source Date reported
TENOR CAPITAL MANAGEMENT Co., L.P. History No change 1,500,000 15,540 0.22% 0.2% 1 0 0.0% Q4 2025 Feb 17, 2026
Magnetar Financial LLC History No change 1,300,000 13,468 0.13% 0.08% 2 0 0.0% Q4 2025 Feb 17, 2026
D. E. Shaw & Co., Inc. History No change 1,138,500 11,794 0.01% 0.01% 3 0 0.0% Q4 2025 Feb 17, 2026
LINDEN ADVISORS LP History No change 1,000,000 10,360 0.06% 0.07% 4 0 0.0% Q4 2025 Feb 17, 2026
AQR Arbitrage LLC History No change 964,382 9,990 0.21% 0.25% 5 0 0.0% Q4 2025 Feb 17, 2026
Westchester Capital Management, LLC History Added to 907,144 9,398 0.39% 0.42% 6 +7,144 0.79% Q4 2025 Feb 13, 2026
GLAZER CAPITAL, LLC History Reduced 864,303 8,954 0.24% 0.3% 7 -10,784 -1.23% Q4 2025 Feb 13, 2026
LMR Partners LLP History No change 850,000 8,806 0.02% 0.04% 8 0 0.0% Q4 2025 Feb 17, 2026
Ghisallo Capital Management LLC History No change 800,000 8,288 0.37% 0.27% 9 0 0.0% Q4 2025 Feb 17, 2026
Governors Lane LP History Added to 758,617 7,859 0.47% 0.59% 10 +8,617 1.15% Q4 2025 Feb 17, 2026
Alberta Investment Management Corp History No change 750,000 7,770 0.05% 0.05% 11 0 0.0% Q4 2025 Feb 19, 2026
TWO SIGMA INVESTMENTS, LP History No change 725,000 7,511 0.01% 0.01% 12 0 0.0% Q4 2025 Feb 17, 2026
METEORA CAPITAL, LLC History Added to 718,433 7,442 0.62% 0.7% 13 +68,533 10.55% Q4 2025 Feb 17, 2026
Hudson Bay Capital Management LP History No change 700,000 7,252 0.02% 0.02% 14 0 0.0% Q4 2025 Feb 13, 2026
Radcliffe Capital Management, L.P. History Added to 658,322 6,820 0.37% 0.39% 15 +46,800 7.65% Q4 2025 Feb 17, 2026
Sculptor Capital LP History Reduced 600,646 6,222 0.06% 0.09% 16 -139,354 -18.83% Q4 2025 Feb 13, 2026
DRIEHAUS CAPITAL MANAGEMENT LLC History No change 573,083 5,937 0.04% 0.04% 17 0 0.0% Q4 2025 Feb 17, 2026
PICTON MAHONEY ASSET MANAGEMENT History No change 500,000 5,180 0.04% 0.05% 18 0 0.0% Q4 2025 Feb 11, 2026
Jain Global LLC History No change 500,000 5,180 0.03% 0.02% 19 0 0.0% Q4 2025 Feb 17, 2026
MOORE CAPITAL MANAGEMENT, LP History No change 450,000 4,662 0.07% 0.06% 20 0 0.0% Q4 2025 Feb 17, 2026
PERISCOPE CAPITAL INC. History Reduced 448,100 4,642 0.53% 0.81% 21 -51,900 -10.38% Q4 2025 Feb 10, 2026
RIVERNORTH CAPITAL MANAGEMENT, LLC History Reduced 447,750 4,638 0.22% 0.26% 22 -2,135 -0.47% Q4 2025 Feb 17, 2026
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS History No change 400,000 4,144 0.02% 0.02% 23 0 0.0% Q4 2025 Feb 10, 2026
WOLVERINE ASSET MANAGEMENT LLC History Reduced 355,354 3,681 0.03% 0.03% 24 -100,972 -22.13% Q4 2025 Feb 02, 2026
GOLDMAN SACHS GROUP INC History No change 323,854 3,355 0.0% 0.0% 25 0 0.0% Q4 2025 Mar 25, 2026
MILLENNIUM MANAGEMENT LLC History Added to 307,985 3,190 0.0% 0.0% 26 +4,020 1.32% Q4 2025 Feb 17, 2026
MIZUHO SECURITIES USA LLC History Reduced 303,827 3,114 0.05% 0.07% 27 -31,271 -9.33% Q4 2025 Feb 09, 2026
Mint Tower Capital Management B.V. History No change 300,000 3,108 0.36% 0.36% 28 0 0.0% Q4 2025 Feb 12, 2026
Centiva Capital, LP History No change 285,515 2,957 0.02% 0.03% 29 0 0.0% Q4 2025 Feb 13, 2026
Shaolin Capital Management LLC History Added to 270,783 2,805 0.09% 0.09% 30 +70,783 35.39% Q4 2025 Feb 17, 2026
ARISTEIA CAPITAL, L.L.C. History No change 250,000 2,590 0.06% 0.06% 31 0 0.0% Q4 2025 Feb 17, 2026
WHITEBOX ADVISORS LLC History No change 250,000 2,590 0.04% 0.04% 32 0 0.0% Q4 2025 Feb 17, 2026
Verition Fund Management LLC History Reduced 231,470 2,398 0.01% 0.01% 33 -20,000 -7.95% Q4 2025 Feb 13, 2026
BERKLEY W R CORP History No change 228,206 2,364 0.11% 0.13% 34 0 0.0% Q4 2025 Feb 13, 2026
L1 Global Manager Pty Ltd History New 200,000 2,072 1.36% 37 +200,000 New Q4 2025 Feb 13, 2026
DLD Asset Management, LP History Reduced 200,000 2,072 0.15% 0.11% 36 -25,000 -11.11% Q4 2025 Feb 13, 2026
OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) History No change 200,000 2,072 2.86% 0.33% 35 0 0.0% Q4 2025 Mar 04, 2026
Schonfeld Strategic Advisors LLC History Reduced 173,515 1,797 0.01% 0.01% 38 -48,150 -21.72% Q4 2025 Feb 17, 2026
TORONTO DOMINION BANK History Added to 150,002 1,554 0.0% 0.0% 39 +1 0.0% Q4 2025 Feb 17, 2026
READYSTATE ASSET MANAGEMENT LP History No change 147,534 1,528 0.06% 0.06% 40 0 0.0% Q4 2025 Feb 17, 2026
MMCAP International Inc. SPC History No change 125,000 1,295 0.13% 0.15% 41 0 0.0% Q4 2025 Feb 09, 2026
JPMORGAN CHASE & CO History Reduced 100,000 1,059 0.0% 0.0% 42 -38,380 -27.74% Q4 2025 Feb 11, 2026
GRITSTONE ASSET MANAGEMENT LLC History No change 99,081 1,026 0.98% 1.04% 43 0 0.0% Q4 2025 Jan 23, 2026
K2 PRINCIPAL FUND, L.P. History Reduced 87,900 910 0.07% 0.09% 44 -25,770 -22.67% Q4 2025 Feb 13, 2026
Clear Street Group Inc. History Added to 78,853 827 0.0% 0.0% 45 +11,892 17.76% Q4 2025 Feb 13, 2026
Baird Financial Group, Inc. History New 78,500 813 0.0% 46 +78,500 New Q4 2025 Feb 13, 2026
CSS LLC/IL History Added to 57,143 592 0.03% 0.02% 47 +7,143 14.29% Q4 2025 Feb 17, 2026
StoneX Group Inc. History New 50,613 524 0.02% 48 +50,613 New Q4 2025 Feb 12, 2026
JANE STREET GROUP, LLC History Reduced 46,060 487 0.0% 0.0% 49 -11 -0.02% Q4 2025 Feb 12, 2026
Warberg Asset Management LLC History No change 10,000 103 0.01% 0.02% 50 0 0.0% Q4 2025 Feb 13, 2026
UBS Group AG History Added to 4,136 43 0.0% 0.0% 51 +6 0.15% Q4 2025 Jan 29, 2026
MORGAN STANLEY History Added to 130 1 0.0% 52 +79 154.9% Q4 2025 Feb 13, 2026