MF
AACB

Magnetar Financial’s Artius II Acquisition Inc AACB Stock Holding History

Magnetar Financial’s Portfolio AACB Stock Details AACB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$6.2M Hold
600,000
– – 0.06% 198
2025
Q4 		$6.18M Hold
600,000
– – 0.06% 166
2025
Q3 		$6.08M Hold
600,000
– – 0.04% 200
2025
Q2 		$6.07M Buy
+600,000
New +$6.01M 0.03% 215

Other funds holding AACB

HIM
HGC Investment Management Toronto, Ontario, Canada $451M AUM 8.78% 1-Year Est. Return
AA
AQR Arbitrage Greenwich, Connecticut $6.09B AUM 27.01% 1-Year Est. Return
GCL
Glazer Capital LLC New York $4.71B AUM 81.93% 1-Year Est. Return
LA
Linden Advisors New York $17.9B AUM 1.72% 1-Year Est. Return
WCMNY
Westchester Capital Management (New York) Valhalla, New York $2.21B AUM 26.02% 1-Year Est. Return
AIMCA
Alberta Investment Management Corp (AIMCo) Edmonton, Alberta, Canada $16.7B AUM 23.27% 1-Year Est. Return
Healthcare of Ontario Pension Plan (HOOPP) Trust Fund
Healthcare of Ontario Pension Plan (HOOPP) Trust Fund Toronto, Ontario, Canada $62.2B AUM 31.35% 1-Year Est. Return
PAMP
Polar Asset Management Partners Toronto, Ontario, Canada $5.01B AUM 35.27% 1-Year Est. Return
PMAM
Picton Mahoney Asset Management Toronto, Ontario, Canada $13.5B AUM 50.48% 1-Year Est. Return
Two Sigma Investments
Two Sigma Investments New York $124B AUM 33.93% 1-Year Est. Return

Magnetar Financial's AACB Position: Q1 2026 in Review

Magnetar Financial held its Artius II Acquisition Inc (AACB) position steady in Q1 2026 at 600,000 shares worth $6.2M. The position accounts for 0.06% of the portfolio, ranked #198.

Magnetar Financial first reported a position in AACB in Q2 2025 and has held it in 4 quarters since. 52 funds tracked by Wall St. Rank hold AACB as of Q1 2026.

  • Magnetar Financial held 600,000 shares of Artius II Acquisition Inc worth $6.2M as of Q1 2026.
  • Magnetar Financial left its Artius II Acquisition Inc share count unchanged in Q1 2026.
  • Artius II Acquisition Inc made up 0.06% of Magnetar Financial's portfolio in Q1 2026, its #198 holding.
  • Magnetar Financial first reported a position in Artius II Acquisition Inc in Q2 2025 and has held it in 4 quarters since.
  • 52 funds tracked by Wall St. Rank held Artius II Acquisition Inc as of Q1 2026.

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