iRhythm Holdings, Inc.
DE ˙ DB ˙ US4500561067
90,00 € ↓ -5,50 (-5,76%)
2026-06-02
DEL PRIS
SecurityDE:I25 / iRhythm Holdings, Inc.
InstitutionJanus Henderson Group Plc
Latest Disclosed Ownership13,856 shares
Latest Disclosed Value $ 1,635,701
Janus Henderson Group Plc ownership in I25 / iRhythm Holdings, Inc.

On May 18, 2026 - Janus Henderson Group Plc filed a 13F-HR/A form disclosing ownership of 13,856 shares of iRhythm Holdings, Inc. (DE:I25) valued at $1,357,888 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 13,856 shares of iRhythm Holdings, Inc.. This represents a change in shares of 0.00% during the quarter. The current value of the position is $1,247,040 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

Upgrade to unlock premium data and export to Excel .

Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-18 2026-03-31 13F/A-1 IRHYTHM HOLDINGS COM 450056106 13,856 0 0.00 1,636 -33.48 0.0003
2026-05-15 2026-03-31 13F IRHYTHM HOLDINGS COM 450056106 13,856 0 0.00 1,636 -33.48 0.0003
2026-02-17 2025-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 13,856 0 0.00 2,458 3.23 0.0011
2025-11-14 2025-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 13,856 0 0.00 2,382 11.73 0.0011
2025-08-14 2025-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 13,856 0 0.00 2,132 46.56 0.0010
2025-05-15 2025-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 13,856 0 0.00 1,454 16.32 0.0008
2025-02-14 2024-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 13,856 0 0.00 1,250 21.71 0.0006
2024-11-14 2024-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 13,856 0 0.00 1,028 -31.07 0.0005
2024-08-14 2024-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 13,856 -156 -1.11 1,490 -8.25 0.0008
2024-05-15 2024-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 14,012 1 0.01 1,625 8.27 0.0009
2024-02-14 2023-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 14,011 -23 -0.16 1,501 13.46 0.0009
2023-11-14 2023-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 14,034 -234,427 -94.35 1,322 -94.90 0.0009
2023-08-14 2023-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 248,461 -229,958 -48.07 25,920 -56.32 0.0161
2023-05-15 2023-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 478,419 8,603 1.83 59,338 34.84 0.0391
2023-02-14 2022-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 469,816 -3,381 -0.71 44,007 -25.77 0.0314
2023-01-13 2022-09-30 13F/A-1 IRHYTHM TECHNOLOGIES COM 450056106 473,197 -160 -0.03 59,282 15.93 0.0444
2022-11-14 2022-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 473,197 -160 59,282 0.0151
2022-08-15 2022-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 473,357 -118 -0.02 51,137 -31.41 0.0353
2022-05-16 2022-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 473,475 -20,161 -4.08 74,558 28.34 0.0360
2022-02-14 2021-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 493,636 493,636 58,096 0.0242
2020-05-14 2020-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 0 -3,874 -100.00 0 -100.00
2020-02-18 2019-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 3,874 289 8.06 264 -0.75 0.0001
2019-11-14 2019-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 3,585 81 2.31 266 -3.97 0.0001
2019-07-31 2019-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 3,504 -316 -8.27 277 -3.15 0.0002
2019-04-30 2019-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 3,820 3,820 286 0.0002
2019-02-06 2018-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 0 -2,822 -100.00 0 -100.00
2018-11-09 2018-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 2,822 2,822 267 0.0001
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.