iRhythm Holdings, Inc.
DE ˙ DB ˙ US4500561067
89,00 € ↑1,00 (1,14%)
2026-06-04
DEL PRIS
SecurityDE:I25 / iRhythm Holdings, Inc.
InstitutionFred Alger Management, Llc
Latest Disclosed Ownership280,040 shares
Latest Disclosed Value $ 33,050,321
Fred Alger Management, Llc reports 9.83% decrease in ownership of I25 / iRhythm Holdings, Inc.

On May 15, 2026 - Fred Alger Management, Llc filed a 13F-HR form disclosing ownership of 280,040 shares of iRhythm Holdings, Inc. (DE:I25) valued at $27,443,920 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 310,582 shares of iRhythm Holdings, Inc.. This represents a change in shares of -9.83% during the quarter. The current value of the position is $24,923,560 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)
2026-05-15 2026-03-31 13F iRhythm Holdings Equity 450056106 280,040 -30,542 -9.83 33,050 -40.03 0.0924
2026-02-17 2025-12-31 13F iRhythm Technologies Equity 450056106 310,582 -9,517 -2.97 55,110 0.10 0.2161
2025-11-14 2025-09-30 13F iRhythm Technologies Equity 450056106 320,099 -5,444 -1.67 55,054 9.84 0.2143
2025-08-14 2025-06-30 13F iRhythm Technologies Equity 450056106 325,543 75,829 30.37 50,121 91.74 0.2243
2025-05-16 2025-03-31 13F iRhythm Technologies Equity 450056106 249,714 -23,059 -8.45 26,140 6.28 0.1489
2025-02-14 2024-12-31 13F iRhythm Technologies Equity 450056106 272,773 -41,344 -13.16 24,596 5.47 0.1172
2024-11-14 2024-09-30 13F IRHYTHM TECHNOLOGIES Common 450056106 314,117 61,696 24.44 23,320 -14.17 0.1130
2024-08-14 2024-06-30 13F IRHYTHM TECHNOLOGIES Common 450056106 252,421 28,132 12.54 27,171 4.43 0.1321
2024-05-15 2024-03-31 13F IRHYTHM TECHNOLOGIES Common 450056106 224,289 -5,581 -2.43 26,018 5.74 0.1290
2024-02-14 2023-12-31 13F IRHYTHM TECHNOLOGIES Common 450056106 229,870 214,110 1,358.57 24,605 1,556.90 0.1328
2023-11-14 2023-09-30 13F IRHYTHM TECHNOLOGIES Common 450056106 15,760 15,760 1,486 0.0079
2023-11-14 2023-09-30 13F IRHYTHM TECHNOLOGIES Common 450056106 15,760 15,760 1,486 0.0079
2023-08-14 2023-06-30 13F IRHYTHM TECHNOLOGIES Common 450056106 0 -3,467 -100.00 0 -100.00
2023-05-16 2023-03-31 13F/A-1 IRHYTHM TECHNOLOGIES Common 450056106 3,467 3,467 430 0.0023
2023-05-15 2023-03-31 13F IRHYTHM TECHNOLOGIES Common 450056106 3,467 3,467 430 0.0021
2022-08-15 2022-06-30 13F IRHYTHM TECHNOLOGIES Common 450056106 0 -32,252 -100.00 0 -100.00
2022-05-16 2022-03-31 13F IRHYTHM TECHNOLOGIES Common 450056106 32,252 32,252 5,079 0.0162
2021-05-17 2021-03-31 13F IRHYTHM TECHNOLOGIES Common 450056106 0 -644,466 -100.00 0 -100.00
2021-02-16 2020-12-31 13F IRHYTHM TECHNOLOGIES Common 450056106 644,466 140,826 27.96 152,874 27.48 0.3977
2020-11-13 2020-09-30 13F IRHYTHM TECHNOLOGIES Common 450056106 503,640 503,640 119,922 0.3481
2020-02-14 2019-12-31 13F IRHYTHM TECHNOLOGIES Common 450056106 0 -537,616 -100.00 0 -100.00
2019-11-14 2019-09-30 13F IRHYTHM TECHNOLOGIES Common 450056106 537,616 6,608 1.24 39,843 -5.12 0.1563
2019-08-14 2019-06-30 13F IRHYTHM TECHNOLOGIES Common 450056106 531,008 51,612 10.77 41,992 16.85 0.1613
2019-05-14 2019-03-31 13F IRHYTHM TECHNOLOGIES Common 450056106 479,396 479,378 2,663,211.11 35,936 3,593,500.00 0.1431
2019-02-14 2018-12-31 13F IRHYTHM TECHNOLOGIES Common 450056106 18 18 1 0.0000
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.