iRhythm Holdings, Inc.
DE ˙ DB ˙ US4500561067
89,00 € ↑1,00 (1,14%)
2026-06-04
DEL PRIS
SecurityDE:I25 / iRhythm Holdings, Inc.
InstitutionRenaissance Technologies Llc
ManagerJames Simons
Latest Disclosed Ownership53,800 shares
Latest Disclosed Value $ 6,349,476
Renaissance Technologies Llc reports 48.22% decrease in ownership of I25 / iRhythm Holdings, Inc.

On May 14, 2026 - Renaissance Technologies Llc filed a 13F-HR form disclosing ownership of 53,800 shares of iRhythm Holdings, Inc. (DE:I25) valued at $5,272,400 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 103,900 shares of iRhythm Holdings, Inc.. This represents a change in shares of -48.22% during the quarter. The current value of the position is $4,788,200 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)
2026-05-14 2026-03-31 13F IRHYTHM HOLDINGS COM 450056106 53,800 -50,100 -48.22 6,349 -65.56 0.0099
2026-02-12 2025-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 103,900 -17,500 -14.42 18,436 -11.70 0.0286
2025-11-13 2025-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 121,400 -19,800 -14.02 20,880 -3.96 0.0276
2025-08-13 2025-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 141,200 119,100 538.91 21,739 839.86 0.0289
2025-05-14 2025-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 22,100 22,100 2,313 0.0035
2024-02-13 2023-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 0 -72,800 -100.00 0 -100.00
2023-11-14 2023-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 72,800 -10,700 -12.81 7 -25.00 0.0117
2023-08-11 2023-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 83,500 73,900 769.79 9 700.00 0.0126
2023-05-12 2023-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 9,600 -92,200 -90.57 1 -88.89 0.0016
2023-02-13 2022-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 101,800 101,800 10 0.0130
2022-11-14 2022-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 0 -16,400 -100.00 0 -100.00
2022-08-12 2022-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 16,400 -2,300 -12.30 1,772 -39.83 0.0021
2022-05-13 2022-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 18,700 18,700 2,945 0.0035
2022-02-11 2021-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 0 -242,100 -100.00 0 -100.00
2021-11-12 2021-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 242,100 -93,500 -27.86 14,177 -36.33 0.0183
2021-08-13 2021-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 335,600 193,100 135.51 22,267 12.53 0.0278
2021-05-13 2021-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 142,500 142,500 -57.54 19,788 -11.13 0.0246
2020-05-14 2020-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 0 -177,500 -100.00 0 -100.00
2020-02-13 2019-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 177,500 177,500 12,086 0.0093
2019-08-12 2019-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 0 -87,400 -100.00 0 -100.00
2019-05-14 2019-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 87,400 -110,200 -55.77 6,552 -52.28 0.0060
2019-02-12 2018-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 197,600 17,500 9.72 13,729 -19.47 0.0150
2018-11-13 2018-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 180,100 -45,200 -20.06 17,048 -6.73 0.0175
2018-08-13 2018-06-30 13F/A-1 IRHYTHM TECHNOLOGIES COM 450056106 225,300 -180,000 -44.41 18,279 -28.36 0.0199
2018-08-13 2018-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 405,300 25,514
2018-05-14 2018-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 405,300 161,000 65.90 25,514 86.33 0.0279
2018-02-13 2017-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 244,300 41,800 20.64 13,693 30.34 0.0151
2017-11-13 2017-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 202,500 -72,300 -26.31 10,506 -10.02 0.0124
2017-08-11 2017-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 274,800 187,600 215.14 11,676 256.08 0.0149
2017-05-12 2017-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 87,200 87,200 3,279 0.0046
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.