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ATII

Archimedes Tech SPAC Partners II Co.

Company with tickers: ATII, ATIIU, ATIIW

CIK
2028516
CUSIP
G04537109
Shares Outstanding
29,590,000
13F Activity (30d)
53 filings 51 filers
Holders: 54
Total Value: $230,953,536
Total Shares: 22,185,740

Institutional Ownership Trend

4 quarters

Holder Concentration

Across 54 13F filers · Δ vs Dec 31, 2025
Top Holder
6.8%
Jun 2025 → Mar 2026 · range 6.7% – 7.1%
+0.0 pts
Top 5
26.4%
Jun 2025 → Mar 2026 · range 26.4% – 29.4%
−0.1 pts
Top 10
44.7%
Jun 2025 → Mar 2026 · range 44.7% – 49.4%
−0.6 pts
HHI
320
Jun 2025 → Mar 2026 · range 320 – 367
Broadly held −9

Quarterly Activity

vs Dec 31, 2025
New
9
Increased
6
Decreased
10
Sold Out
4
Unchanged
29
Holder count: +5
Institutional value: +0.2%
Shares held: -0.3%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Large TORONTO DOMINION BANK +499,998 650,000
Large Clear Street Group Inc. +73,257 77,452
Mega GOLDMAN SACHS GROUP INC +3,596 327,450
Small Radcliffe Capital Management, L.P. +3,015 661,337
Mid READYSTATE ASSET MANAGEMENT LP +1,200 148,734

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Mid METEORA CAPITAL, LLC −422,821 295,612
Mid MIZUHO SECURITIES USA LLC −284,358 19,469
Mid WOLVERINE ASSET MANAGEMENT LLC −221,074 134,280
Mid GLAZER CAPITAL, LLC −114,303 750,000
Small Periscope Capital Inc. −95,220 352,880

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Small RLH Capital LLC 400,907 $4,173,441
Mid J. Goldman & Co LP 369,778 $3,849,388
Small Quarry LP 285,000 $2,966,850
Mid O'Connor Alternative Investments LLC 200,000 $2,082,000
Small Lineage Point Capital LP 95,895 $998,266

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Large Driehaus Capital Management LLC 573,083 $5,937,139
Mid OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) 200,000 $2,072,000
Small StoneX Group Inc. 50,613 $524,350
Micro Warberg Asset Management LLC 10,000 $103,600
Filter: New 9 Increased 6 Reduced 10 Sold out 4 Unchanged 29
Showing 54 of 54
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mid TENOR CAPITAL MANAGEMENT Co., L.P. $15,615,000 6.76% 1,500,000
Mid Magnetar Financial LLC $13,533,000 5.86% 1,300,000
Mega D. E. Shaw & Co., Inc. $11,851,785 5.13% 1,138,500
Mid Linden Advisors LP $10,410,000 4.51% 1,000,000
Mid AQR Arbitrage LLC $9,584,195 4.15% 920,672
Mid Westchester Capital Management, LLC $9,443,367 4.09% 907,144
Large LMR Partners LLP $8,848,500 3.83% 850,000
Mid Ghisallo Capital Management LLC $8,328,000 3.61% 800,000
Mid Governors Lane LP $7,906,977 3.42% 759,556
Mid GLAZER CAPITAL, LLC $7,807,500 3.38% 750,000
Mid Alberta Investment Management Corp $7,807,500 3.38% 750,000
Mega TWO SIGMA INVESTMENTS, LP $7,547,250 3.27% 725,000
Large Hudson Bay Capital Management LP $7,287,000 3.16% 700,000
Small Radcliffe Capital Management, L.P. $6,884,518 2.98% 661,337
Large TORONTO DOMINION BANK Bank $6,766,500 2.93% 650,000
Mid Sculptor Capital LP $6,252,724 2.71% 600,646
Large Jain Global LLC $5,205,000 2.25% 500,000
Mid PICTON MAHONEY ASSET MANAGEMENT $5,205,000 2.25% 500,000
Mid MOORE CAPITAL MANAGEMENT, LP $4,684,500 2.03% 450,000
Mid RIVERNORTH CAPITAL MANAGEMENT, LLC $4,450,275 1.93% 427,500
Small RLH Capital LLC $4,173,441 1.81% 400,907
Large COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS $4,164,000 1.80% 400,000
Mid J. Goldman & Co LP $3,849,388 1.67% 369,778
Small Periscope Capital Inc. $3,673,480 1.59% 352,880
Mega GOLDMAN SACHS GROUP INC $3,408,754 1.48% 327,450
Mega MILLENNIUM MANAGEMENT LLC $3,206,123 1.39% 307,985
Small Mint Tower Capital Management B.V. $3,123,000 1.35% 300,000
Mid METEORA CAPITAL, LLC $3,077,320 1.33% 295,612
Large Centiva Capital, LP $2,972,211 1.29% 285,515
Small Quarry LP $2,966,850 1.28% 285,000
Small Shaolin Capital Management LLC $2,818,851 1.22% 270,783
Mid ARISTEIA CAPITAL, L.L.C. $2,602,500 1.13% 250,000
Mid WHITEBOX ADVISORS LLC $2,602,500 1.13% 250,000
Large Verition Fund Management LLC $2,409,602 1.04% 231,470
Mid BERKLEY W R CORP $2,165,956 0.94% 208,065
Micro L1 Global Manager Pty Ltd $2,082,000 0.90% 200,000
Mid O'Connor Alternative Investments LLC $2,082,000 0.90% 200,000
Large Schonfeld Strategic Advisors LLC $1,806,291 0.78% 173,515
Small DLD Asset Management, LP $1,561,500 0.68% 150,000
Mid READYSTATE ASSET MANAGEMENT LP $1,548,320 0.67% 148,734
Mid WOLVERINE ASSET MANAGEMENT LLC $1,397,854 0.61% 134,280
Small MMCAP International Inc. SPC $1,301,250 0.56% 125,000
Micro GRITSTONE ASSET MANAGEMENT LLC $1,031,433 0.45% 99,081
Small Lineage Point Capital LP $998,266 0.43% 95,895
Small K2 PRINCIPAL FUND, L.P. $915,039 0.40% 87,900
Large Baird Financial Group, Inc. $817,185 0.35% 78,500
Large Clear Street Group Inc. $806,275 0.35% 77,452
Small CSS LLC/IL $594,858 0.26% 57,143
Mid Virtu Financial LLC $558,871 0.24% 53,686
Mega BNP PARIBAS ARBITRAGE, SA $392,915 0.17% 37,744
Mid MIZUHO SECURITIES USA LLC Broker-Dealer $202,672 0.09% 19,469
Mega GEODE CAPITAL MANAGEMENT, LLC $115,571 0.05% 11,102
Mega CITADEL ADVISORS LLC $108,024 0.05% 10,377
Mega MORGAN STANLEY $645 0.00% 62

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