Security key
450056106
iRhythm Holdings, Inc. - Common Stock, $0.001 par value (IRTC)
CUSIP: 450056106
Q2 2026 13F Holders as of 30 Jun 2026
- Security type / class
- Equity / Common Stock, $0.001 par value
- Total 13F shares
- 35,625,887
- Total 13F value
- $4,238,800,755
- Share change
- +69,730
- Put/Call ratio
- 109%
- SEC-reported price per share
- $118.95
- Number of holders
- 303
- Value change
- +$8,009,055
- Number of buys
- 159
- Number of sells
- 130
- Shares outstanding
- 33,070,167
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q2 2026
Institutions
303
Top holders
10
IRTC full security history
Ownership snapshot
Full 13F holder table
iRhythm Holdings, Inc. SEC filings
iRhythm Holdings, Inc. company facts
Broader feeds
Ownership snapshot
Top reported holders of IRTC - iRhythm Holdings, Inc. - Common Stock, $0.001 par value (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
RTW INVESTMENTS, LP
Disclosed value leader
RTW INVESTMENTS, LP
Comparable rows
15/15
Latest evidence
30 Jun 2026
13D/G
13F
3/4/5
Lead comparable stake: 6.6%
13D/G row: RTW INVESTMENTS, LP
Showing 1-6 of 15 holder rows.
Quick read
RTW INVESTMENTS, LP leads the comparable SEC ownership view at 6.6%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens RTW INVESTMENTS, LP's linked filing trail.
Comparable ownership
Top 5
RTW INVESTMENTS, LP
6.6%
VANGUARD PORTFOLIO MANAGEMENT LLC
5.6%
VANGUARD CAPITAL MANAGEMENT LLC
5.2%
MILLENNIUM MANAGEMENT LLC
5.1%
Artisan Partners Limited Partnership
5.1%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| RTW INVESTMENTS, LP |
13D/G
13F
Company
|
6.6%
|
$273,025,312
2,182,631 shares
|
+$64,312,647 | 30 Jun 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13D/G
13F
Vanguard Portfolio Management · Company
|
5.6%
|
$215,279,102
1,824,090 shares
|
$0 | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
13F
Vanguard Capital Management · Company
|
5.2%
|
$199,628,993
1,691,483 shares
|
$0 | 31 Mar 2026 |
| MILLENNIUM MANAGEMENT LLC |
13D/G
13F
Company
|
5.1%
|
$251,228,085
1,664,203 shares
|
$0 | 16 Mar 2026 |
| Artisan Partners Limited Partnership |
13D/G
13F
Artisan Partners Asset Management Inc. · Company
|
5.1%
|
$207,687,803
1,660,307 shares
|
+$18,552,723 | 30 Jun 2026 |
| Capital Research Global Investors |
13D/G
13F
Company
|
4.7%
|
$204,843,092
1,506,864 shares
|
-$94,581,343 | 30 Jun 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q2 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
303
Shares
35,625,887
Rows available
303
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q2 2026 vs Q1 2026 Across Filers
Q1 2026 holders
302
Q2 2026 holders
303
Holder diff
1
| Investor | Q1 2026 Shares | Q2 2026 Shares | Share Diff | Share Chg % | Q1 2026 value | Q2 2026 value | Value change | Value Chg % |
|---|