MF
ATII

Magnetar Financial’s Archimedes Tech SPAC Partners II Co ATII Stock Holding History

Magnetar Financial’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
2026
Q1 		$13.6M Hold
1,300,000
– – 0.14% 100
2025
Q4 		$13.5M Hold
1,300,000
– – 0.13% 93
2025
Q3 		$13.3M Hold
1,300,000
– – 0.08% 95
2025
Q2 		$13.2M Buy
+1,300,000
New +$13.1M 0.06% 87

Other funds holding ATII

TCM
Tenor Capital Management New York $6.49B AUM 3.01% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return
LA
Linden Advisors New York $17.9B AUM 1.72% 1-Year Est. Return
AA
AQR Arbitrage Greenwich, Connecticut $6.09B AUM 27.01% 1-Year Est. Return
WCMNY
Westchester Capital Management (New York) Valhalla, New York $2.21B AUM 26.02% 1-Year Est. Return
LP
LMR Partners London, United Kingdom $45.4B AUM 60.68% 1-Year Est. Return
GCM
Ghisallo Capital Management Boston, Massachusetts $3.63B AUM 30.51% 1-Year Est. Return
GL
Governors Lane New York $1.56B AUM 30.42% 1-Year Est. Return
AIMCA
Alberta Investment Management Corp (AIMCo) Edmonton, Alberta, Canada $16.7B AUM 23.27% 1-Year Est. Return
GCL
Glazer Capital LLC New York $4.71B AUM 81.93% 1-Year Est. Return

Magnetar Financial's ATII Position: Q1 2026 in Review

Magnetar Financial held its Archimedes Tech SPAC Partners II Co (ATII) position steady in Q1 2026 at 1,300,000 shares worth $13.6M. The position accounts for 0.14% of the portfolio, ranked #100.

Magnetar Financial first reported a position in ATII in Q2 2025 and has held it in 4 quarters since. 54 funds tracked by Wall St. Rank hold ATII as of Q1 2026.

  • Magnetar Financial held 1,300,000 shares of Archimedes Tech SPAC Partners II Co worth $13.6M as of Q1 2026.
  • Magnetar Financial left its Archimedes Tech SPAC Partners II Co share count unchanged in Q1 2026.
  • Archimedes Tech SPAC Partners II Co made up 0.14% of Magnetar Financial's portfolio in Q1 2026, its #100 holding.
  • Magnetar Financial first reported a position in Archimedes Tech SPAC Partners II Co in Q2 2025 and has held it in 4 quarters since.
  • 54 funds tracked by Wall St. Rank held Archimedes Tech SPAC Partners II Co as of Q1 2026.

Based on Magnetar Financial's 13F filing for Q1 2026, filed 13 May 2026.