Ken Griffin
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Ken Griffin’s AtriCure ATRC Stock Holding History

Ken Griffin’s Portfolio ATRC Stock Details ATRC Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q2 		– Sell
-4,500
Closed -$145K – 12474
2025
Q1 		$145K Hold
4,500
– – ﹤0.01% 10926
2024
Q4 		$138K Sell
4,500
-2,700
-38% -$86.8K ﹤0.01% 11016
2024
Q3 		$202K Buy
7,200
+3,600
+100% +$88.7K ﹤0.01% 10135
2024
Q2 		$82K Sell
3,600
-500
-12% -$11.5K ﹤0.01% 11181
2024
Q1 		$125K Buy
4,100
+2,400
+141% +$80.4K ﹤0.01% 11057
2023
Q4 		$60.7K Buy
+1,700
New +$63.2K ﹤0.01% 11582
2023
Q3 		– Sell
-300
Closed -$14.8K – 14254
2023
Q2 		$14.8K Buy
+300
New +$13.8K ﹤0.01% 12987
2021
Q3 		– Sell
-5,000
Closed -$397K – 13772
2021
Q2 		$397K Sell
5,000
-1,800
-26% -$131K ﹤0.01% 10578
2021
Q1 		$446K Buy
+6,800
New +$419K ﹤0.01% 9929
2020
Q4 		– Sell
-6,700
Closed -$267K – 10887
2020
Q3 		$267K Buy
6,700
+1,200
+22% +$50.9K ﹤0.01% 8333
2020
Q2 		$247K Buy
+5,500
New +$239K ﹤0.01% 8224
2015
Q4 		– Sell
-500
Closed -$11K – 8707
2015
Q3 		$11K Buy
+500
New +$12.5K ﹤0.01% 8427

Other funds holding ATRC

AllianceBernstein
AllianceBernstein Nashville, Tennessee $309B AUM 23.92% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
HRCM
Hood River Capital Management Palm Beach Gardens, Florida $9.98B AUM 145.42% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
NAMI
Nomura Asset Management International Philadelphia, Pennsylvania $58.4B AUM
Goldman Sachs
Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $127B AUM 46.06% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Ken Griffin's ATRC Position: Q1 2026 in Review

Ken Griffin reduced its AtriCure (ATRC) stake by 64% in Q1 2026, selling an estimated $5.3M and leaving 87,347 shares worth $2.49M. The position accounts for ﹤0.01% of the portfolio, ranked #5629.

Ken Griffin first reported a position in ATRC in Q4 2013 and has held it in 40 quarters since. The position peaked at $65.8M in Q2 2021. 223 funds tracked by Wall St. Rank hold ATRC as of Q1 2026.

  • Ken Griffin held 87,347 shares of AtriCure worth $2.49M as of Q1 2026.
  • Ken Griffin sold 155,394 AtriCure shares in Q1 2026, an estimated $5.3M.
  • AtriCure made up ﹤0.01% of Ken Griffin's portfolio in Q1 2026, its #5629 holding.
  • Ken Griffin first reported a position in AtriCure in Q4 2013 and has held it in 40 quarters since.
  • Ken Griffin's AtriCure position peaked at $65.8M in Q2 2021.
  • 223 funds tracked by Wall St. Rank held AtriCure as of Q1 2026.

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