iRhythm Holdings, Inc. - Common Stock, $0.001 par value (IRTC)

CUSIP: 450056106

Q1 2026 13F Holders as of 31 Mar 2026

Security type / class
Equity / Common Stock, $0.001 par value
Total 13F shares
35,464,528
Total 13F value
$4,181,243,240
Holder snapshot 6 visible 7 signals
Share change
+233,354
Put/Call ratio
74%
SEC-reported price per share
$118.02
Number of holders
299
Value change
-$168,044,559
Number of buys
150
Show 1 more signal
Number of sells
170
Security identity 1 source field
Shares outstanding
32,086,538

Security key

450056106

Report period

Q1 2026

Institutions

299

Top holders

10

IRTC full security history Ownership snapshot Full 13F holder table Previous quarter: Q4 2025 iRhythm Holdings, Inc. SEC filings iRhythm Holdings, Inc. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

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
VANGUARD PORTFOLIO MANAGE...
Disclosed value leader
Artisan Partners Limited ...
Comparable rows
15/15
Latest evidence
31 Mar 2026
13D/G 13F 3/4/5 Lead comparable stake: 5.6% 13D/G row: VANGUARD PORTFOLIO MANAGEMENT LLC Showing 1-6 of 15 holder rows.

Quick read

VANGUARD PORTFOLIO MANAGEMENT LLC leads the comparable SEC ownership view at 5.6%.

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.

Comparable ownership Top 5
VANGUARD PORTFOLIO MANAGEMENT LLC 5.6%
VANGUARD CAPITAL MANAGEMENT LLC 5.2%
RTW INVESTMENTS, LP 5.2%
MILLENNIUM MANAGEMENT LLC 5.1%
Artisan Partners Limited Partnership 4.7%

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
VANGUARD PORTFOLIO MANAGEMENT LLC
13D/G
Vanguard Portfolio Management
13D/G
5.6%
$215,279,102
1,824,090 shares
 $0 31 Mar 2026
VANGUARD CAPITAL MANAGEMENT LLC
13D/G
Vanguard Capital Management
13D/G
5.2%
$199,628,993
1,691,483 shares
 $0 31 Mar 2026
RTW INVESTMENTS, LP
13F 13D/G
Company
13F 13D/G
5.2%
from 13D/G
$209,732,306
1,181,990 shares
 — 31 Dec 2025
MILLENNIUM MANAGEMENT LLC
13D/G 13F
Company
13D/G 13F
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
13D/G 13F
4.7%
$268,287,860
1,511,992 shares
 $0 31 Dec 2025
Capital Research Global Investors
13F 13D/G
Company
13F 13D/G
4.7%
from 13D/G
$210,221,330
1,184,746 shares
 — 31 Dec 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 Q1 2026

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions
299
Shares
35,464,528
Rows available
299
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 Q1 2026 vs Q4 2025 Across Filers

Q4 2025 holders
335
Q1 2026 holders
299
Holder diff
-36
Investor Q4 2025 Shares Q1 2026 Shares Share Diff Share Chg % Q4 2025 value Q1 2026 value Value change Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend
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