Ken Griffin
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Ken Griffin’s ATS Corp ATS Stock Holding History

Ken Griffin’s Portfolio ATS Stock Details ATS Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q2 		– Sell
-5,200
Closed -$130K – 12476
2025
Q1 		$130K Buy
5,200
+800
+18% +$22.3K ﹤0.01% 11092
2024
Q4 		$134K Sell
4,400
-1,000
-19% -$30.4K ﹤0.01% 11052
2024
Q3 		$157K Sell
5,400
-1,500
-22% -$43.4K ﹤0.01% 10512
2024
Q2 		$223K Buy
6,900
+6,200
+886% +$200K ﹤0.01% 9697
2024
Q1 		$23.6K Buy
+700
New +$27.8K ﹤0.01% 12892

Other funds holding ATS

MCM
Mason Capital Management New York $613M AUM 21.43% 1-Year Est. Return
Royal Bank of Canada
Royal Bank of Canada Toronto, Ontario, Canada $570B AUM 27.57% 1-Year Est. Return
EIG
EdgePoint Investment Group Toronto, Ontario, Canada $12.5B AUM 31.7% 1-Year Est. Return
BGC
Beutel, Goodman & Co Toronto, Ontario, Canada $13.6B AUM 17.82% 1-Year Est. Return
TCAM
Turtle Creek Asset Management Toronto, Ontario, Canada $2.67B AUM 0.64% 1-Year Est. Return
Bank of Montreal
Bank of Montreal Toronto, Ontario, Canada $304B AUM 35.64% 1-Year Est. Return
FFH
Fairfax Financial Holdings Toronto, Ontario, Canada $1.94B AUM 27.76% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Janus Henderson Group
Janus Henderson Group London, United Kingdom $209B AUM 37.72% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

Ken Griffin's ATS Position: Q1 2026 in Review

Ken Griffin reduced its ATS Corp (ATS) stake by 45% in Q1 2026, selling an estimated $2.03M and leaving 81,239 shares worth $2.29M. The position accounts for ﹤0.01% of the portfolio, ranked #5801.

Ken Griffin first reported a position in ATS in Q2 2023 and has held it in 10 quarters since. The position peaked at $27.9M in Q2 2023. 130 funds tracked by Wall St. Rank hold ATS as of Q1 2026.

  • Ken Griffin held 81,239 shares of ATS Corp worth $2.29M as of Q1 2026.
  • Ken Griffin sold 67,601 ATS Corp shares in Q1 2026, an estimated $2.03M.
  • ATS Corp made up ﹤0.01% of Ken Griffin's portfolio in Q1 2026, its #5801 holding.
  • Ken Griffin first reported a position in ATS Corp in Q2 2023 and has held it in 10 quarters since.
  • Ken Griffin's ATS Corp position peaked at $27.9M in Q2 2023.
  • 130 funds tracked by Wall St. Rank held ATS Corp as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.