13F Insight
DOSSIER · 13F Holders · Q1 2026Healthcare · Surgical & Medical Instruments & ApparatusBellwetherCompounder
IRTC

IRHYTHM TECHNOLOGIES INC

318 institutions still hold IRHYTHM TECHNOLOGIES INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 450056106·Surgical & Medical Instruments & Apparatus·318 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 3.4%
vs prior quarter
13F value held
$2.6B
75.0% inst. owned
of float
Holders
318
-29 QoQ
filers reporting
Activity
+101 / −45
+931 added · −819 reduced
this quarter
Concentration
12.50%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q1 2026

318 institutions reported IRTC in Q1 2026. BlackRock, Inc. leads at 12.5% of the visible book. -29 net institutions QoQ — distribution reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$324M2.7M0.01%Q1 202602
Vanguard Portfolio Management
CIK 0002100121
$212M1.8M0.01%Q1 202603
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$197M1.7M0.08%Q1 202604
RTW INVESTMENTS, LP
CIK 0001493215
$197M1.7M1.96%Q1 202605
Artisan Partners Limited Partnership
CIK 0001466153
$171M1.5M0.27%Q1 202606
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$171M1.4M0.00%Q1 202607
FMR LLC
CIK 0000315066
$161M1.4M0.01%Q1 202608
Holocene Advisors, LP
CIK 0001700574
$147M1.2M0.36%Q1 202609
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC
CIK 0000861177
$124M1.0M0.03%Q1 202610
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$96M817K0.01%Q1 202611
STATE STREET CORP
CIK 0000093751
$93M788K0.00%Q1 202612
BNP Paribas Asset Management Holding S.A.
CIK 0001520354
$90M762K0.10%Q1 202613
EVENTIDE ASSET MANAGEMENT, LLC
CIK 0001442891
$90M761K1.48%Q1 202614
JPMORGAN CHASE & CO
CIK 0000019617
$82M715K0.01%Q1 202615
FULLER & THALER ASSET MANAGEMENT, INC.
CIK 0001082327
$80M675K0.27%Q1 202616
BLAIR WILLIAM & CO/IL
CIK 0000902367
$74M628K0.21%Q1 202617
Point72 Asset Management, L.P.
CIK 0001603466
$73M621K0.09%Q1 202618
BRAIDWELL LP
CIK 0001920938
$72M610K2.40%Q1 202619
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
CIK 0001164508
$69M583K0.04%Q1 202620
Stephens Investment Management Group LLC
CIK 0001314440
$66M562K0.91%Q1 2026
Page 1 of 16
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