UBS O'Connor
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UBS O'Connor’s Archimedes Tech SPAC Partners II Co ATII Stock Holding History

UBS O'Connor’s Portfolio ATII Stock Details ATII Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		$2.07M Hold
200,000
– – 0.06% 106
2025
Q3 		$2.05M Hold
200,000
– – 0.06% 133
2025
Q2 		$2.05M Buy
+200,000
New +$2.02M 0.06% 156

Other funds holding ATII

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Magnetar Financial
Magnetar Financial Evanston, Illinois $11B AUM 3.37% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $210B AUM 57.28% 1-Year Est. Return
LA
Linden Advisors New York $19.3B AUM 1.47% 1-Year Est. Return
AQR Arbitrage
AQR Arbitrage Greenwich, Connecticut $7.02B AUM 31.58% 1-Year Est. Return
Westchester Capital Management (New York)
Westchester Capital Management (New York) Valhalla, New York $2.04B AUM 31.03% 1-Year Est. Return
Glazer Capital LLC
Glazer Capital LLC New York $4.07B AUM 78.71% 1-Year Est. Return
LMR Partners
LMR Partners London, United Kingdom $26.8B AUM 68.38% 1-Year Est. Return
Ghisallo Capital Management
Ghisallo Capital Management Boston, Massachusetts $5.1B AUM 39.13% 1-Year Est. Return
Governors Lane
Governors Lane New York $1.2B AUM 26.21% 1-Year Est. Return

UBS O'Connor's ATII Position: Q4 2025 in Review

UBS O'Connor held its Archimedes Tech SPAC Partners II Co (ATII) position steady in Q4 2025 at 200,000 shares worth $2.07M. The position accounts for 0.06% of the portfolio, ranked #106.

UBS O'Connor first reported a position in ATII in Q2 2025 and has held it in 3 quarters since. 49 funds tracked by Wall St. Rank hold ATII as of Q4 2025.

  • UBS O'Connor held 200,000 shares of Archimedes Tech SPAC Partners II Co worth $2.07M as of Q4 2025.
  • UBS O'Connor left its Archimedes Tech SPAC Partners II Co share count unchanged in Q4 2025.
  • Archimedes Tech SPAC Partners II Co made up 0.06% of UBS O'Connor's portfolio in Q4 2025, its #106 holding.
  • UBS O'Connor first reported a position in Archimedes Tech SPAC Partners II Co in Q2 2025 and has held it in 3 quarters since.
  • 49 funds tracked by Wall St. Rank held Archimedes Tech SPAC Partners II Co as of Q4 2025.

Based on UBS O'Connor's 13F filing for Q4 2025, filed 13 Feb 2026.