Group One Trading
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Group One Trading’s iRhythm Holdings IRTC Stock Holding History

Group One Trading’s Portfolio IRTC Stock Details IRTC Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		– Sell
-4,700
Closed -$808K – 8630
2025
Q3 		$808K Buy
4,700
+4,500
+2,250% +$715K ﹤0.01% 3238
2025
Q2 		$30.8K Sell
200
-1,800
-90% -$233K ﹤0.01% 5958
2025
Q1 		$209K Buy
2,000
+1,300
+186% +$138K ﹤0.01% 3969
2024
Q4 		$63.1K Sell
700
-1,200
-63% -$94.3K ﹤0.01% 4879
2024
Q3 		$141K Buy
1,900
+1,400
+280% +$112K ﹤0.01% 3908
2024
Q2 		$53.8K Sell
500
-100
-17% -$10.2K ﹤0.01% 4477
2024
Q1 		$69.6K Sell
600
-1,700
-74% -$191K ﹤0.01% 4432
2023
Q4 		$246K Sell
2,300
-9,300
-80% -$811K ﹤0.01% 3679
2023
Q3 		$1.09M Buy
11,600
+8,100
+231% +$824K ﹤0.01% 2173
2023
Q2 		$365K Sell
3,500
-2,000
-36% -$240K ﹤0.01% 3347
2023
Q1 		$682K Sell
5,500
-1,100
-17% -$119K ﹤0.01% 2468
2022
Q4 		$618K Sell
6,600
-29,200
-82% -$3.18M ﹤0.01% 2849
2022
Q3 		$4.49M Sell
35,800
-1,300
-4% -$188K 0.01% 1245
2022
Q2 		$4.01M Buy
37,100
+8,800
+31% +$1.17M 0.01% 1468
2022
Q1 		$4.46M Buy
28,300
+17,800
+170% +$2.29M ﹤0.01% 1641
2021
Q4 		$1.24M Sell
10,500
-50,400
-83% -$4.62M ﹤0.01% 3131
2021
Q3 		$3.57M Buy
60,900
+37,100
+156% +$1.97M ﹤0.01% 2053
2021
Q2 		$1.58M Buy
23,800
+10,100
+74% +$800K ﹤0.01% 2895
2021
Q1 		$1.9M Sell
13,700
-3,900
-22% -$699K ﹤0.01% 2527
2020
Q4 		$4.17M Sell
17,600
-3,700
-17% -$843K 0.01% 1415
2020
Q3 		$5.07M Buy
21,300
+5,700
+37% +$1.01M 0.02% 911
2020
Q2 		$1.81M Buy
15,600
+9,100
+140% +$1M 0.01% 1535
2020
Q1 		$529K Sell
6,500
-25,400
-80% -$2.11M ﹤0.01% 2013
2019
Q4 		$2.17M Buy
31,900
+30,500
+2,179% +$2.07M 0.01% 1231
2019
Q3 		$104K Buy
+1,400
New +$108K ﹤0.01% 3527
2019
Q2 		– Sell
-8,000
Closed -$600K – 5148
2019
Q1 		$600K Buy
8,000
+1,000
+14% +$85.5K 0.01% 1797
2018
Q4 		$486K Sell
7,000
-700
-9% -$53.1K ﹤0.01% 2006
2018
Q3 		$729K Buy
+7,700
New +$671K 0.01% 1951

Other funds holding IRTC

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
RI
RTW Investments New York $11.7B AUM 174.13% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Artisan Partners
Artisan Partners Milwaukee, Wisconsin $63.1B AUM 35.51% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
UBS AM
UBS AM Chicago, Illinois $550B AUM 43.33% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
EAM
Eventide Asset Management Boston, Massachusetts $7.48B AUM 104.76% 1-Year Est. Return

Group One Trading's IRTC Position: Q2 2026 in Review

Group One Trading reduced its iRhythm Holdings (IRTC) stake by 79% in Q2 2026, selling an estimated $160K and leaving 371 shares worth $44.1K. The position accounts for ﹤0.01% of the portfolio, ranked #5473.

Group One Trading first reported a position in IRTC in Q4 2017 and has held it in 20 quarters since. The position peaked at $4.93M in Q4 2021. 303 funds tracked by Wall St. Rank hold IRTC as of Q2 2026.

  • Group One Trading held 371 shares of iRhythm Holdings worth $44.1K as of Q2 2026.
  • Group One Trading sold 1,378 iRhythm Holdings shares in Q2 2026, an estimated $160K.
  • iRhythm Holdings made up ﹤0.01% of Group One Trading's portfolio in Q2 2026, its #5473 holding.
  • Group One Trading first reported a position in iRhythm Holdings in Q4 2017 and has held it in 20 quarters since.
  • Group One Trading's iRhythm Holdings position peaked at $4.93M in Q4 2021.
  • 303 funds tracked by Wall St. Rank held iRhythm Holdings as of Q2 2026.

Based on Group One Trading's 13F filing for Q2 2026, filed 14 Aug 2026.