iRhythm Holdings, Inc.
DE ˙ DB ˙ US4500561067
88,00 € ↓ -2,00 (-2,22%)
2026-06-03
DEL PRIS
SecurityDE:I25 / iRhythm Holdings, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership237,799 shares
Latest Disclosed Value $ 28,065,076
Morgan Stanley reports 39.89% increase in ownership of I25 / iRhythm Holdings, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 237,799 shares of iRhythm Holdings, Inc. (DE:I25) valued at $23,304,302 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 169,991 shares of iRhythm Holdings, Inc.. This represents a change in shares of 39.89% during the quarter. The current value of the position is $20,926,312 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 COM 450056106 237,799 67,808 39.89 28,065 -6.96 0.0017
2026-05-27 2025-12-31 13F/A-1 IRHYTHM TECHNOLOGIES COM 450056106 169,991 15,120 9.76 30,163 13.24 0.0018
2026-02-13 2025-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 169,991 15,120 30,163 0.0018
2026-05-27 2025-09-30 13F/A-1 IRHYTHM TECHNOLOGIES COM 450056106 154,871 -23,027 -12.94 26,637 -2.75 0.0016
2025-11-14 2025-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 154,871 -23,027 26,637 0.0016
2025-08-15 2025-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 177,898 -54,771 -23.54 27,389 12.46 0.0018
2025-05-15 2025-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 232,669 -19,095 -7.58 24,356 7.29 0.0017
2025-05-15 2024-12-31 13F/A-1 IRHYTHM TECHNOLOGIES COM 450056106 251,764 -56,859 -18.42 22,702 -0.92 0.0016
2025-02-14 2024-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 251,764 -56,859 22,702 0.0016
2025-05-14 2024-09-30 13F/A-2 IRHYTHM TECHNOLOGIES COM 450056106 308,623 -45,883 -12.94 22,912 -39.96 0.0017
2025-02-14 2024-09-30 13F/A-1 IRHYTHM TECHNOLOGIES COM 450056106 308,623 -45,883 22,912 0.0017
2024-11-14 2024-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 308,623 -45,883 22,912 0.0017
2025-05-14 2024-06-30 13F/A-2 IRHYTHM TECHNOLOGIES COM 450056106 354,506 169,409 91.52 38,159 77.72 0.0030
2024-10-17 2024-06-30 13F/A-1 IRHYTHM TECHNOLOGIES COM 450056106 354,506 169,409 38,159 0.0030
2024-08-14 2024-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 354,506 169,409 38,159 0.0030
2024-10-17 2024-03-31 13F/A-2 IRHYTHM TECHNOLOGIES COM 450056106 185,097 -102,647 -35.67 21,471 -30.29 0.0017
2024-08-16 2024-03-31 13F/A-1 IRHYTHM TECHNOLOGIES COM 450056106 185,097 -102,647 21,471 0.0002
2024-05-15 2024-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 185,097 -102,647 21,471 0.0017
2024-08-16 2023-12-31 13F/A-1 IRHYTHM TECHNOLOGIES COM 450056106 287,744 126,803 78.79 30,800 103.03 0.0027
2024-02-13 2023-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 287,744 126,803 30,800 0.0027
2023-11-15 2023-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 160,941 8,307 5.44 15,170 -4.72 0.0015
2023-08-14 2023-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 152,634 -58,296 -27.64 15,923 -39.14 0.0016
2023-05-15 2023-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 210,930 59,484 39.28 26,162 84.43 0.0028
2023-02-14 2022-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 151,446 63,496 72.20 14,186 28.74 0.0016
2022-11-14 2022-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 87,950 -181,837 -67.40 11,018 -62.19 0.0015
2022-10-27 2022-06-30 13F/A-1 IRHYTHM TECHNOLOGIES COM 450056106 269,787 166,646 161.57 29,144 79.45 0.0038
2022-08-15 2022-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 269,787 166,646 29,144 0.0008
2022-10-27 2022-03-31 13F/A-1 IRHYTHM TECHNOLOGIES COM 450056106 103,141 25,545 32.92 16,241 77.83 0.0022
2022-05-13 2022-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 103,141 25,545 16,241 0.0022
2022-02-14 2021-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 77,596 -113,082 -59.31 9,133 -18.21 0.0011
2021-11-15 2021-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 190,678 -32,160 -14.43 11,166 -24.47 0.0015
2021-08-23 2021-06-30 13F/A-1 IRHYTHM TECHNOLOGIES COM 450056106 222,838 105,154 89.35 14,783 -9.53 0.0019
2021-08-16 2021-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 222,838 105,154 14,783 0.0004
2021-05-17 2021-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 117,684 33,329 39.51 16,341 -18.34 0.0024
2021-02-16 2020-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 84,355 21,702 34.64 20,010 34.12 0.0031
2020-11-13 2020-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 62,653 -317,924 -83.54 14,919 -66.17 0.0029
2020-08-14 2020-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 380,577 88,239 30.18 44,105 85.46 0.0098
2020-05-26 2020-03-31 13F/A-1 IRHYTHM TECHNOLOGIES COM 450056106 292,338 81,895 38.92 23,781 65.95 0.0065
2020-05-15 2020-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 292,338 81,895 23,781 1,826.8765
2020-02-14 2019-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 210,443 -66,644 -24.05 14,330 -30.22 0.0033
2019-11-14 2019-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 277,087 199,655 257.85 20,535 235.37 0.0054
2019-08-14 2019-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 77,432 -140,542 -64.48 6,123 -62.52 0.0016
2019-05-15 2019-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 217,974 148,109 211.99 16,338 236.59 0.0046
2019-02-14 2018-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 69,865 -223,646 -76.20 4,854 -82.53 0.0015
2019-04-23 2018-09-30 13F/A-2 IRHYTHM TECHNOLOGIES COM 450056106 293,511 65,801 28.90 27,783 50.39 0.0070
2018-11-20 2018-09-30 13F/A-1 IRHYTHM TECHNOLOGIES COM 450056106 293,511 0 27,783 0.0070
2018-11-14 2018-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 293,511 65,801 27,783
2019-04-23 2018-06-30 13F/A-1 IRHYTHM TECHNOLOGIES COM 450056106 227,710 170,649 299.06 18,474 414.31 0.0050
2018-08-14 2018-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 227,710 170,649 18,474
2019-04-23 2018-03-31 13F/A-1 IRHYTHM TECHNOLOGIES COM 450056106 57,061 -3,626 -5.97 3,592 5.62 0.0010
2018-05-14 2018-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 57,061 -3,626 3,592
2019-04-23 2017-12-31 13F/A-1 IRHYTHM TECHNOLOGIES COM 450056106 60,687 30,409 100.43 3,401 116.49 0.0009
2018-02-14 2017-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 60,687 30,409 3,401
2017-11-14 2017-09-30 13F IRHYTHM TECHNOLOGIES COM 450056106 30,278 -32,689 -51.91 1,571 -41.27 0.0005
2017-08-11 2017-06-30 13F IRHYTHM TECHNOLOGIES COM 450056106 62,967 47,017 294.78 2,675 345.83 0.0008
2017-05-22 2017-03-31 13F/A-1 IRHYTHM TECHNOLOGIES COM 450056106 15,950 -7,329 -31.48 600 -14.04 0.0002
2017-05-12 2017-03-31 13F IRHYTHM TECHNOLOGIES COM 450056106 15,950 600
2017-02-22 2016-12-31 13F/A-1 IRHYTHM TECHNOLOGIES COM 450056106 23,279 23,279 698 0.0002
2017-02-13 2016-12-31 13F IRHYTHM TECHNOLOGIES COM 450056106 23,279 698 0.0002
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.