Jim Simons
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Jim Simons’s iRhythm Holdings IRTC Stock Holding History

Jim Simons’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
2026
Q1 		$6.35M Sell
53,800
-50,100
-48% -$7.23M 0.01% 1226
2025
Q4 		$18.4M Sell
103,900
-17,500
-14% -$3.1M 0.03% 639
2025
Q3 		$20.9M Sell
121,400
-19,800
-14% -$3.15M 0.03% 705
2025
Q2 		$21.7M Buy
141,200
+119,100
+539% +$15.4M 0.03% 677
2025
Q1 		$2.31M Buy
+22,100
New +$2.34M ﹤0.01% 1912
2023
Q4 		– Sell
-72,800
Closed -$6.86M – 3908
2023
Q3 		$6.86M Sell
72,800
-10,700
-13% -$1.09M 0.01% 1124
2023
Q2 		$8.71M Buy
83,500
+73,900
+770% +$8.87M 0.01% 1104
2023
Q1 		$1.19M Sell
9,600
-92,200
-91% -$10M ﹤0.01% 2358
2022
Q4 		$9.54M Buy
+101,800
New +$11.1M 0.01% 1109
2022
Q3 		– Sell
-16,400
Closed -$1.77M – 4222
2022
Q2 		$1.77M Sell
16,400
-2,300
-12% -$305K ﹤0.01% 2282
2022
Q1 		$2.94M Buy
+18,700
New +$2.4M ﹤0.01% 1939
2021
Q4 		– Sell
-242,100
Closed -$14.2M – 4064
2021
Q3 		$14.2M Sell
242,100
-93,500
-28% -$4.95M 0.02% 841
2021
Q2 		$22.3M Buy
335,600
+193,100
+136% +$15.3M 0.03% 700
2021
Q1 		$19.8M Buy
+142,500
New +$25.5M 0.02% 779
2020
Q1 		– Sell
-177,500
Closed -$12.1M – 3609
2019
Q4 		$12.1M Buy
+177,500
New +$12M 0.01% 1327
2019
Q2 		– Sell
-87,400
Closed -$6.55M – 3646
2019
Q1 		$6.55M Sell
87,400
-110,200
-56% -$9.42M 0.01% 1632
2018
Q4 		$13.7M Buy
197,600
+17,500
+10% +$1.33M 0.02% 1122
2018
Q3 		$17M Sell
180,100
-45,200
-20% -$3.94M 0.02% 1033
2018
Q2 		$18.3M Sell
225,300
-180,000
-44% -$12.6M 0.02% 977
2018
Q1 		$25.5M Buy
405,300
+161,000
+66% +$9.97M 0.03% 795
2017
Q4 		$13.7M Buy
244,300
+41,800
+21% +$2.18M 0.02% 1196
2017
Q3 		$10.5M Sell
202,500
-72,300
-26% -$3.27M 0.01% 1299
2017
Q2 		$11.7M Buy
274,800
+187,600
+215% +$6.83M 0.01% 1182
2017
Q1 		$3.28M Buy
+87,200
New +$3M ﹤0.01% 1960

Other funds holding IRTC

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
RI
RTW Investments New York $10B AUM 135.35% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return
Artisan Partners
Artisan Partners Milwaukee, Wisconsin $62.3B AUM 26.25% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Holocene Advisors
Holocene Advisors New York $41.5B AUM 42.97% 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

Jim Simons's IRTC Position: Q1 2026 in Review

Jim Simons reduced its iRhythm Holdings (IRTC) stake by 48% in Q1 2026, selling an estimated $7.23M and leaving 53,800 shares worth $6.35M. The position accounts for 0.01% of the portfolio, ranked #1226.

Jim Simons first reported a position in IRTC in Q1 2017 and has held it in 24 quarters since. The position peaked at $25.5M in Q1 2018. 304 funds tracked by Wall St. Rank hold IRTC as of Q1 2026.

  • Jim Simons held 53,800 shares of iRhythm Holdings worth $6.35M as of Q1 2026.
  • Jim Simons sold 50,100 iRhythm Holdings shares in Q1 2026, an estimated $7.23M.
  • iRhythm Holdings made up 0.01% of Jim Simons's portfolio in Q1 2026, its #1226 holding.
  • Jim Simons first reported a position in iRhythm Holdings in Q1 2017 and has held it in 24 quarters since.
  • Jim Simons's iRhythm Holdings position peaked at $25.5M in Q1 2018.
  • 304 funds tracked by Wall St. Rank held iRhythm Holdings as of Q1 2026.

Based on Renaissance Technologies's 13F filing for Q1 2026, filed 14 May 2026.