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BLAIR WILLIAM & CO/IL

Position in IRTC — iRhythm Holdings, Inc.

CIK 902367 CHICAGO, IL

Position in IRTC

as of Mar 31, 2026 · filed May 8, 2026
Position Value
$74,161,997
-$53,381,342 QoQ
Shares Held
628,385
-12.6% QoQ
Ownership
1.91%
of shares outstanding
% of Portfolio
0.26%
of 13F equity value
Holder Rank
not a current holder
Holding Since
Mar 2020
25 quarters on record
Voting authority Sole 63.20981563850188.ToString("F0")% Shared 0.ToString("F0")% None 36.79018436149812.ToString("F0")%

Common Shares in IRTC Over Time

Shares Held

Position Value (USD)

Position in Medical Devices

Healthcare · as of Mar 31, 2026

BLAIR WILLIAM & CO/IL holds $713,437,167 across 22 Medical Devices names. IRTC ranks #4 (10.4% of the industry book) .

# Ticker Company Shares Value (USD) Open
4 IRTC
iRhythm Holdings, Inc.
This page
628,385 $74,161,997

All Filings in IRTC

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25 filing rows on record
Report Date Value (USD) Shares
2026-03-31 $74,161,997 628,385
2025-12-31 $127,543,339 718,797
2025-09-30 $127,396,604 740,721
2025-06-30 $113,827,400 739,331
2025-03-31 $82,697,095 789,999
2024-12-31 $54,529,135 604,737
2024-09-30 $47,843,299 644,441
2024-06-30 $86,012,971 799,080
2024-03-31 $96,620,344 832,934
2023-12-31 $86,177,047 805,092
2023-09-30 $104,762,166 1,111,417
2023-06-30 $108,746,714 1,042,434
2023-03-31 $125,107,696 1,008,689
2022-12-31 $85,516,213 912,952
2022-09-30 $103,115,587 823,081
2022-06-30 $73,287,119 678,396
2022-03-31 $108,837,437 691,163
2021-12-31 $88,862,422 755,055
2021-09-30 $40,419,517 690,224
2021-06-30 $42,111,283 634,684
2021-03-31 $69,174,914 498,163
2020-12-31 $50,432,743 212,608
2020-09-30 $39,933,428 167,710
2020-06-30 $21,477,893 185,330
2020-03-31 $2,306,760 28,356