Janus Henderson Group
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Janus Henderson Group’s iRhythm Holdings IRTC Stock Holding History

Janus Henderson Group’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 		$1.64M Hold
13,856
– – ﹤0.01% 1448
2025
Q4 		$2.46M Hold
13,856
– – ﹤0.01% 1238
2025
Q3 		$2.38M Hold
13,856
– – ﹤0.01% 1249
2025
Q2 		$2.13M Hold
13,856
– – ﹤0.01% 1260
2025
Q1 		$1.45M Hold
13,856
– – ﹤0.01% 1432
2024
Q4 		$1.25M Hold
13,856
– – ﹤0.01% 1570
2024
Q3 		$1.03M Hold
13,856
– – ﹤0.01% 1653
2024
Q2 		$1.49M Sell
13,856
-156
-1% -$15.9K ﹤0.01% 1397
2024
Q1 		$1.62M Buy
14,012
+1
+0% +$112 ﹤0.01% 1391
2023
Q4 		$1.5M Sell
14,011
-23
-0.2% -$2K ﹤0.01% 1401
2023
Q3 		$1.32M Sell
14,034
-234,427
-94% -$23.8M ﹤0.01% 1402
2023
Q2 		$25.9M Sell
248,461
-229,958
-48% -$27.6M 0.02% 512
2023
Q1 		$59.3M Buy
478,419
+8,603
+2% +$933K 0.04% 343
2022
Q4 		$44M Sell
469,816
-3,381
-0.7% -$368K 0.03% 398
2022
Q3 		$59.3M Sell
473,197
-160
-0% -$23.1K 0.04% 326
2022
Q2 		$51.1M Sell
473,357
-118
-0% -$15.6K 0.04% 371
2022
Q1 		$74.6M Sell
473,475
-20,161
-4% -$2.59M 0.04% 392
2021
Q4 		$58.1M Buy
+493,636
New +$45.3M 0.02% 502
2020
Q1 		– Sell
-3,874
Closed -$264K – 1359
2019
Q4 		$264K Buy
3,874
+289
+8% +$19.6K ﹤0.01% 1364
2019
Q3 		$266K Buy
3,585
+81
+2% +$6.28K ﹤0.01% 1352
2019
Q2 		$277K Sell
3,504
-316
-8% -$23K ﹤0.01% 1328
2019
Q1 		$286K Buy
+3,820
New +$326K ﹤0.01% 1297
2018
Q4 		– Sell
-2,822
Closed -$267K – 1384
2018
Q3 		$267K Buy
+2,822
New +$246K ﹤0.01% 1398

Other funds holding IRTC

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
RI
RTW Investments New York $11.7B AUM 174.13% 1-Year Est. Return
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return
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
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Holocene Advisors
Holocene Advisors New York $44.4B AUM 57.89% 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

Janus Henderson Group's IRTC Position: Q1 2026 in Review

Janus Henderson Group held its iRhythm Holdings (IRTC) position steady in Q1 2026 at 13,856 shares worth $1.64M. The position accounts for ﹤0.01% of the portfolio, ranked #1448.

Janus Henderson Group first reported a position in IRTC in Q3 2018 and has held it in 23 quarters since. The position peaked at $74.6M in Q1 2022. 305 funds tracked by Wall St. Rank hold IRTC as of Q1 2026.

  • Janus Henderson Group held 13,856 shares of iRhythm Holdings worth $1.64M as of Q1 2026.
  • Janus Henderson Group left its iRhythm Holdings share count unchanged in Q1 2026.
  • iRhythm Holdings made up ﹤0.01% of Janus Henderson Group's portfolio in Q1 2026, its #1448 holding.
  • Janus Henderson Group first reported a position in iRhythm Holdings in Q3 2018 and has held it in 23 quarters since.
  • Janus Henderson Group's iRhythm Holdings position peaked at $74.6M in Q1 2022.
  • 305 funds tracked by Wall St. Rank held iRhythm Holdings as of Q1 2026.

Based on Janus Henderson Group's 13F filing for Q1 2026, filed 15 May 2026.