iRhythm Holdings, Inc.
DE ˙ DB ˙ US4500561067
89,00 € ↑1,00 (1,14%)
2026-06-04
DEL PRIS
SecurityDE:I25 / iRhythm Holdings, Inc.
InstitutionBlair William & Co/il
Latest Disclosed Ownership628,385 shares
Latest Disclosed Value $ 74,161,984
Blair William & Co/il reports 12.58% decrease in ownership of I25 / iRhythm Holdings, Inc.

On May 8, 2026 - Blair William & Co/il filed a 13F-HR form disclosing ownership of 628,385 shares of iRhythm Holdings, Inc. (DE:I25) valued at $61,581,730 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 718,797 shares of iRhythm Holdings, Inc.. This represents a change in shares of -12.58% during the quarter. The current value of the position is $55,926,265 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.

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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)
2026-05-08 2026-03-31 13F IRHYTHM HOLDINGS COM 450056106 628,385 -90,412 -12.58 74,162 -41.85 0.2125
2026-02-17 2025-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 718,797 -21,924 -2.96 127,543 0.12 0.3423
2025-11-12 2025-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 740,721 1,390 0.19 127,397 11.92 0.3391
2025-07-24 2025-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 739,331 -50,668 -6.41 113,827 37.64 0.3162
2025-05-09 2025-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 789,999 185,262 30.64 82,697 51.66 0.2494
2025-02-12 2024-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 604,737 -39,704 -6.16 54,529 13.97 0.1586
2024-11-12 2024-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 644,441 -154,639 -19.35 47,843 -44.38 0.1405
2024-08-12 2024-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 799,080 -33,854 -4.06 86,013 -10.98 0.2653
2024-05-09 2024-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 832,934 27,842 3.46 96,620 12.12 0.3035
2024-02-12 2023-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 805,092 -306,325 -27.56 86,177 -17.74 0.2937
2023-11-09 2023-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 1,111,417 68,983 6.62 104,762 -3.66 0.4018
2023-08-11 2023-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 1,042,434 33,745 3.35 108,747 -13.08 0.3984
2023-05-12 2023-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 1,008,689 95,737 10.49 125,108 46.30 0.4998
2023-02-10 2022-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 912,952 89,871 10.92 85,516 -17.07 0.3718
2022-11-09 2022-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 823,081 144,685 21.33 103,116 40.70 0.4736
2022-08-10 2022-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 678,396 -12,767 -1.85 73,287 -32.66 0.3251
2022-05-13 2022-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 691,163 -63,892 -8.46 108,837 22.48 0.3815
2022-02-14 2021-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 755,055 64,831 9.39 88,862 119.85 0.2787
2021-11-12 2021-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 690,224 55,540 8.75 40,420 -4.02 0.1376
2021-08-12 2021-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 634,684 136,521 27.40 42,111 -39.12 0.1459
2021-05-13 2021-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 498,163 285,555 134.31 69,175 37.16 0.2610
2021-02-09 2020-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 212,608 44,898 26.77 50,433 26.29 0.1849
2020-11-06 2020-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 167,710 -17,620 -9.51 39,933 85.93 0.1694
2020-08-12 2020-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 185,330 156,974 553.58 21,478 830.99 0.1024
2020-05-11 2020-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 28,356 23,814 524.31 2,307 646.60 0.0144
2020-02-13 2019-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 4,542 4,542 309 0.0016
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.