Holocene Advisors
IRTC icon

Holocene Advisors’s iRhythm Holdings IRTC Stock Holding History

Holocene Advisors’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 		$147M Buy
1,248,658
+565,090
+83% +$81.5M 0.36% 77
2025
Q4 		$121M Buy
683,568
+210,288
+44% +$37.3M 0.25% 110
2025
Q3 		$81.4M Buy
473,280
+160,186
+51% +$25.5M 0.19% 131
2025
Q2 		$48.2M Buy
313,094
+298,347
+2,023% +$38.6M 0.12% 176
2025
Q1 		$1.54M Sell
14,747
-71,106
-83% -$7.53M ﹤0.01% 582
2024
Q4 		$7.74M Sell
85,853
-95,132
-53% -$7.47M 0.02% 323
2024
Q3 		$13.4M Sell
180,985
-861,685
-83% -$68.6M 0.05% 227
2024
Q2 		$112M Buy
1,042,670
+124,021
+14% +$12.7M 0.47% 70
2024
Q1 		$107M Sell
918,649
-44,717
-5% -$5.03M 0.39% 85
2023
Q4 		$103M Buy
963,366
+330,869
+52% +$28.8M 0.4% 88
2023
Q3 		$59.6M Buy
632,497
+205,141
+48% +$20.9M 0.26% 122
2023
Q2 		$44.6M Sell
427,356
-55,071
-11% -$6.61M 0.19% 144
2023
Q1 		$59.8M Sell
482,427
-278,015
-37% -$30.2M 0.29% 111
2022
Q4 		$71.2M Sell
760,442
-216,325
-22% -$23.5M 0.43% 78
2022
Q3 		$122M Buy
976,767
+64,844
+7% +$9.36M 0.78% 34
2022
Q2 		$98.5M Buy
911,923
+160,415
+21% +$21.3M 0.6% 52
2022
Q1 		$118M Buy
751,508
+120,110
+19% +$15.4M 0.62% 49
2021
Q4 		$74.3M Buy
631,398
+255,924
+68% +$23.5M 0.39% 87
2021
Q3 		$22M Buy
375,474
+300,808
+403% +$15.9M 0.12% 190
2021
Q2 		$4.95M Buy
74,666
+48,056
+181% +$3.81M 0.03% 366
2021
Q1 		$3.69M Sell
26,610
-141,669
-84% -$25.4M 0.02% 457
2020
Q4 		$39.9M Sell
168,279
-344,624
-67% -$78.5M 0.25% 133
2020
Q3 		$122M Buy
512,903
+508,187
+10,776% +$89.9M 0.93% 19
2020
Q2 		$547K Sell
4,716
-415,034
-99% -$45.8M ﹤0.01% 503
2020
Q1 		$34.1M Sell
419,750
-332,912
-44% -$27.6M 0.37% 84
2019
Q4 		$51.2M Buy
752,662
+724,583
+2,581% +$49.2M 0.46% 71
2019
Q3 		$2.08M Buy
+28,079
New +$2.18M 0.02% 291

Other funds holding IRTC

BlackRock
BlackRock New York $5.72T AUM 30.48% 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
UBS AM
UBS AM Chicago, Illinois $481B AUM 26.39% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Holocene Advisors's IRTC Position: Q1 2026 in Review

Holocene Advisors increased its iRhythm Holdings (IRTC) stake by 83% in Q1 2026, buying an estimated $81.5M and bringing the position to 1,248,658 shares worth $147M. The position accounts for 0.36% of the portfolio, ranked #77.

Holocene Advisors first reported a position in IRTC in Q3 2019 and has held it in 27 quarters since. 304 funds tracked by Wall St. Rank hold IRTC as of Q1 2026.

  • Holocene Advisors held 1,248,658 shares of iRhythm Holdings worth $147M as of Q1 2026.
  • Holocene Advisors bought 565,090 iRhythm Holdings shares in Q1 2026, an estimated $81.5M.
  • iRhythm Holdings made up 0.36% of Holocene Advisors's portfolio in Q1 2026, its #77 holding.
  • Holocene Advisors first reported a position in iRhythm Holdings in Q3 2019 and has held it in 27 quarters since.
  • 304 funds tracked by Wall St. Rank held iRhythm Holdings as of Q1 2026.

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