Latest Period
Q1 2026
Security Snapshot
iRhythm Holdings, Inc. - Common Stock, $0.001 par value (IRTC) Institutional Ownership
CUSIP: 450056106
13F Institutional Holders and Ownership History from Q4 2016 to Q1 2026
Institutions Reporting
300
Shares (Excl. Options)
35,464,538
Price
$118.02
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- Security type / class
- Equity / Common Stock, $0.001 par value
- Symbol
- IRTC on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 35,464,538
- Total 13F value
- $4,181,244,420
- Portfolio coverage rank
- 0%
- Share change
- +233,354
- Value change
- -$168,044,559
- Number of holders
- 300
- Shares outstanding
- 32,086,538
- SEC-reported price per share
- $125.96
- Insider filing price
- $125.96
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- IRTC - iRhythm Holdings, Inc. - Common Stock, $0.001 par value is tracked under CUSIP 450056106.
- 300 institutions reported positions in Q1 2026.
- 6 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 335 to 300 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $6,241,802,584 to $4,181,244,420.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 300 institutions filings for Q1 2026.
Security key
450056106
Latest holder period
Q1 2026
13F holders
300
13D/G owners
6
CIK / CUSIP context first
Open Q1 2026 holders
IRTC full holder history
iRhythm Holdings, Inc. SEC filings
iRhythm Holdings, Inc. company facts
iRhythm Holdings, Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 450056106:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
6
Security
IRTC
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5.6% | $215,279,102 | 1,824,090 | Vanguard Portfolio Management | 31 Mar 2026 | |||
| VANGUARD CAPITAL MANAGEMENT LLC | 5.2% | $199,628,993 | 1,691,483 | Vanguard Capital Management | 31 Mar 2026 | |||
| RTW INVESTMENTS, LP | 5.2% | $197,149,960 | 1,668,500 | RTW Investments, LP | 31 Mar 2026 | |||
| MILLENNIUM MANAGEMENT LLC | 5.1% | $251,228,085 | 1,664,203 | Millennium Management LLC | 16 Mar 2026 | |||
| Artisan Partners Limited Partnership | 4.7% | $268,287,860 | 1,511,992 | Artisan Partners Asset Management Inc. | 31 Dec 2025 | |||
| Capital Research Global Investors | 4.7% | -33% | $204,843,092 | -$94,581,343 | 1,506,864 | -32% | Capital Research Global Investors | 30 Jun 2025 |
As of 31 Mar 2026, 300 institutional investors reported holding 35,464,538 shares of iRhythm Holdings, Inc. - Common Stock, $0.001 par value (IRTC). This represents 111% of the company’s total 32,086,538 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
76%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 8.5% | 2,741,505 | -2.6% | 0.01% | $323,552,391 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5.6% | 1,796,372 | 0% | 0.01% | $212,007,823 |
| RTW INVESTMENTS, LP | 5.2% | 1,668,500 | +41% | 2% | $196,916,370 |
| MILLENNIUM MANAGEMENT LLC | 5% | 1,608,014 | +95% | 0.14% | $189,777,812 |
| Artisan Partners Limited Partnership | 4.5% | 1,450,907 | -4% | 0.28% | $171,236,007 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.5% | 1,445,710 | 0% | 0% | $170,622,694 |
| FMR LLC | 4.2% | 1,361,919 | +117% | 0.01% | $160,733,672 |
| Holocene Advisors, LP | 3.9% | 1,248,658 | +83% | 0.36% | $147,366,617 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 3.3% | 1,047,452 | +26% | 0.03% | $123,620,286 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.5% | 817,110 | -4.8% | 0.01% | $96,452,668 |
| STATE STREET CORP | 2.5% | 788,302 | +3.1% | 0% | $93,035,402 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 2.4% | 762,062 | +31% | 0.1% | $89,938,558 |
| EVENTIDE ASSET MANAGEMENT, LLC | 2.4% | 760,825 | +9.9% | 1.5% | $89,770,578 |
| JPMORGAN CHASE & CO | 2.2% | 714,896 | -5.8% | 0.01% | $81,648,338 |
| FULLER & THALER ASSET MANAGEMENT, INC. | 2.1% | 674,698 | +5.5% | 0.27% | $79,627,894 |
| BLAIR WILLIAM & CO/IL | 2% | 628,385 | -13% | 0.21% | $74,161,984 |
| BRAIDWELL LP | 1.9% | 610,192 | +181% | 2.4% | $72,014,860 |
| Point72 Asset Management, L.P. | 1.9% | 599,405 | +173% | 0.12% | $70,741,778 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1.8% | 582,879 | -4% | 0.04% | $68,791,380 |
| Stephens Investment Management Group LLC | 1.8% | 561,530 | +8.1% | 0.91% | $66,271,771 |
| D. E. Shaw & Co., Inc. | 1.7% | 554,266 | +54% | 0.05% | $65,414,473 |
| Capital Research Global Investors | 1.6% | 509,590 | -57% | 0.01% | $60,141,812 |
| Allspring Global Investments Holdings, LLC | 1.5% | 467,113 | +15% | 0.09% | $55,222,099 |
| BANK OF AMERICA CORP /DE/ | 1.3% | 432,539 | +22% | 0% | $51,048,251 |
| Polar Capital Holdings Plc | 1.3% | 421,612 | +37% | 0.22% | $49,758,648 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
38
Latest
Q1 2026
Rows shown
1-25 of 38
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 35,464,538 | $4,181,244,420 | -$168,044,559 | $118.02 | 300 |
| 2025 Q4 | 35,179,892 | $6,241,802,584 | +$101,371,006 | $177.44 | 335 |
| 2025 Q3 | 34,675,630 | $5,961,418,750 | -$102,787,901 | $171.99 | 335 |
| 2025 Q2 | 35,390,889 | $5,441,652,911 | -$82,751,717 | $153.96 | 301 |
| 2025 Q1 | 35,983,114 | $3,768,006,864 | +$183,883,851 | $104.68 | 254 |
| 2024 Q4 | 34,327,817 | $3,094,792,701 | +$24,985,709 | $90.17 | 226 |
| 2024 Q3 | 34,300,712 | $2,546,184,989 | -$113,241,307 | $74.24 | 240 |
| 2024 Q2 | 35,528,920 | $3,823,722,858 | +$145,294,737 | $107.64 | 227 |
| 2024 Q1 | 34,502,287 | $4,002,590,157 | +$189,963,417 | $116.00 | 251 |
| 2023 Q4 | 32,945,986 | $3,526,898,502 | -$20,629,057 | $107.04 | 222 |
| 2023 Q3 | 33,182,374 | $3,120,212,405 | -$15,033,608 | $94.26 | 223 |
| 2023 Q2 | 33,299,268 | $3,474,118,901 | -$48,486,102 | $104.32 | 201 |
| 2023 Q1 | 33,708,853 | $4,180,854,132 | +$324,314,586 | $124.03 | 208 |
| 2022 Q4 | 31,151,995 | $2,917,984,399 | -$5,898,665 | $93.67 | 204 |
| 2022 Q3 | 30,401,944 | $3,801,930,092 | +$14,889,346 | $125.28 | 228 |
| 2022 Q2 | 30,387,197 | $3,283,148,343 | +$4,234,235 | $108.03 | 234 |
| 2022 Q1 | 30,296,272 | $4,768,481,076 | +$216,728,151 | $157.47 | 215 |
| 2021 Q4 | 29,128,389 | $3,428,231,271 | +$107,786,048 | $117.69 | 208 |
| 2021 Q3 | 28,055,658 | $1,643,173,747 | -$57,734,125 | $58.56 | 180 |
| 2021 Q2 | 29,024,558 | $1,925,764,915 | -$499,916,095 | $66.35 | 174 |
| 2021 Q1 | 31,071,273 | $4,314,496,144 | -$544,239,396 | $138.86 | 207 |
| 2020 Q4 | 33,270,792 | $7,891,976,678 | +$487,856,041 | $237.21 | 227 |
| 2020 Q3 | 31,198,367 | $7,423,363,500 | +$109,682,337 | $238.11 | 230 |
| 2020 Q2 | 30,796,747 | $3,570,869,382 | -$118,374,619 | $115.89 | 191 |
| 2020 Q1 | 32,167,984 | $2,614,776,733 | -$40,915,934 | $81.35 | 163 |