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IRTC · iRhythm Holdings, Inc. · Shareholders & Ownership

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$113.55 -0.31 (-0.27%)
Market Cap
$3.75B
Shares
32.96M
Volume · Oct 21 48.38K Avg daily vol (3M) 564.11K

Every disclosed holder of IRTC in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

Who Owns IRTC

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

No chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.

Holder group Shares % Out
Institutional (13F) 35,642,913 108.13%
Insiders (Forms 3, 4, 5) 691,786 2.10%
13D/G-only blocks 0 0.00%
Remaining 3,371,696 -10.23%
Registered funds (N-PORT, not summed) 13,573,356 41.18%

Shares outstanding: 32,963,003, the issuer's latest cover-page count restated onto today's split basis.

Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of IRTC

# Holder Shares
1
BlackRock, Inc.
13F CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
2,985,667
1.1
iShares Russell 2000 ETF
Fund S000004344 · Registered fund · Jun 30, 2026
iShares Trust, not summed
860,238
1.2
iShares Russell 2000 Growth ETF
Fund S000004343 · Registered fund · Jun 30, 2026
iShares Trust, not summed
305,804
1.3
iShares U.S. Medical Devices ETF
Fund S000009419 · Registered fund · Jun 30, 2026
iShares Trust, not summed
153,887
1.4
Master Small Cap Index Series
Fund S000002716 · Registered fund · Jun 30, 2026
Quantitative Master Series LLC, not summed
60,932
1.5
BlackRock Advantage Small Cap Core Fund
Fund S000039982 · Registered fund · May 29, 2026
BlackRock Funds, not summed
58,581
2
RTW INVESTMENTS, LP
13F CIK 1493215 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,182,631
2.1
RTW INVESTMENTS, LP
13G CIK 1493215 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
2,182,631
3
VANGUARD PORTFOLIO MANAGEMENT LLC
13F CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,913,976
4
Artisan Partners Limited Partnership
13F CIK 1466153 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,660,307
4.1
Artisan Partners Limited Partnership
13G CIK 1466153 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
1,660,307
4.2
Artisan Mid Cap Fund
Fund S000006496 · Registered fund · Jun 30, 2026
Artisan Partners Funds Inc., not summed
378,618
4.3
Artisan Small Cap Fund
Fund S000006498 · Registered fund · Jun 30, 2026
Artisan Partners Funds Inc., not summed
65,058
4.4
Artisan Global Discovery Fund
Fund S000058458 · Registered fund · Jun 30, 2026
Artisan Partners Funds Inc., not summed
16,358
5
VANGUARD CAPITAL MANAGEMENT LLC
13F CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,463,211
6
FMR LLC
13F CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
1,191,982
6.1
Select Medical Technology and Devices Portfolio
Fund S000007473 · Registered fund · May 31, 2026
Fidelity Select Portfolios, not summed
450,000
6.2
Fidelity Small Cap Index Fund
Fund S000033638 · Registered fund · Jul 31, 2026
Fidelity Salem Street Trust, not summed
361,729
6.3
Select Health Care Portfolio
Fund S000007466 · Registered fund · May 31, 2026
Fidelity Select Portfolios, not summed
180,000
6.4
Fidelity Extended Market Index Fund
Fund S000006021 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
166,803
6.5
Fidelity Advisor Small Cap Fund
Fund S000005115 · Registered fund · May 31, 2026
Fidelity Advisor Series I, not summed
88,600
7
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
1,026,322
8
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC
13F CIK 861177 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
944,517
9
GEODE CAPITAL MANAGEMENT, LLC
13F CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
881,899
10
EVENTIDE ASSET MANAGEMENT, LLC
13F CIK 1442891 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
880,338
10.1
Eventide Gilead Fund
Fund S000022598 · Registered fund · Jun 30, 2026
MUTUAL FUND SERIES TRUST, not summed
582,472
10.2
Eventide Healthcare & Life Sciences Fund
Fund S000039514 · Registered fund · Jun 30, 2026
MUTUAL FUND SERIES TRUST, not summed
277,739
10.3
Eventide Exponential Technologies Fund
Fund S000068813 · Registered fund · Jun 30, 2026
MUTUAL FUND SERIES TRUST, not summed
13,017
10.4
Eventide Small Cap ETF
Fund S000095403 · Registered fund · Jul 31, 2026
Strategy Shares, not summed
913
11
BNP PARIBAS ASSET MANAGEMENT Holding S.A.
13F CIK 1520354 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
866,528
12
STATE STREET CORP
13F CIK 93751 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
856,517
12.1
State Street(R) SPDR(R) S&P Kensho New Economies Composite ETF
Fund S000063362 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
43,791
12.2
State Street(R) SPDR(R) S&P(R) Health Care Equipment ETF
Fund S000012330 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
21,712
12.3
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
11,239
12.4
State Street Institutional Small-Cap Equity Fund
Fund S000001631 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL FUNDS, not summed
7,890
12.5
State Street Total Return V.I.S. Fund
Fund S000001637 · Registered fund · Jun 30, 2026
STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
810
13
Holocene Advisors, LP
13F CIK 1700574 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
783,636
14
JPMORGAN CHASE & CO
13F CIK 19617 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
766,216
15
VANGUARD SMALL-CAP INDEX FUND
Fund S000002845 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
741,498
16
Stephens Investment Management Group LLC
13F CIK 1314440 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
693,437
17
FULLER & THALER ASSET MANAGEMENT, INC.
13F CIK 1082327 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
685,496
18
BRAIDWELL LP
13F CIK 1920938 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
654,262
19
D. E. Shaw & Co., Inc.
13F CIK 1009207 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
629,686
20
MANUFACTURERS LIFE INSURANCE COMPANY, THE
13F CIK 928047 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
561,251
21
BLAIR WILLIAM & CO/IL
13F CIK 902367 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
524,690
22
VANGUARD EXPLORER FUND
Fund S000002578 · Registered fund · Jul 31, 2026
VANGUARD EXPLORER FUND, not summed
521,698
23
BANK OF AMERICA CORP /DE/
13F CIK 70858 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
465,719
24
Polar Capital Holdings Plc
13F CIK 1837309 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
458,089
25
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
13F CIK 1164508 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
450,865
26
SCHRODER INVESTMENT MANAGEMENT GROUP
13F CIK 1086619 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
448,259
27
FULLERTHALER BEHAVIORAL SMALL-CAP GROWTH
Fund S000060086 · Registered fund · Jun 30, 2026
Capitol Series Trust, not summed
447,100
28
Bridge Builder Small/Mid Cap Growth Fund
Fund S000048336 · Registered fund · Jun 30, 2026
Bridge Builder Trust, not summed
435,607
29
VANGUARD SMALL-CAP GROWTH INDEX FUND
Fund S000002846 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
427,292
30
VANGUARD EXTENDED MARKET INDEX FUND
Fund S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
377,971
31
GOLDMAN SACHS GROUP INC
13F CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
362,346
31.1
Goldman Sachs Small Cap Growth Fund
Fund S000061413 · Registered fund · May 31, 2026
Goldman Sachs Trust, not summed
26,030
31.2
Goldman Sachs Small Cap Equity ETF
Fund S000081978 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
17,555
31.3
Goldman Sachs Small Cap Equity Insights Fund
Fund S000009329 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
9,090
31.4
Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF
Fund S000048296 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
8,928
31.5
Goldman Sachs Small Cap Growth Insights Fund
Fund S000014930 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
5,489
32
MILLENNIUM MANAGEMENT LLC
13G CIK 1273087 · Registered investment adviser · Sep 30, 2026
Rule 13d-1(c), passive investor, not summed
349,087
32.1
MILLENNIUM MANAGEMENT LLC
13F CIK 1273087 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,406,454
33
LOOMIS SAYLES & CO L P
13F CIK 312348 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
347,959
33.1
Loomis Sayles Small Cap Growth Fund
Fund S000006705 · Registered fund · Jun 30, 2026
LOOMIS SAYLES FUNDS II, not summed
128,974
33.2
Loomis Sayles Small/Mid Cap Growth Fund
Fund S000049859 · Registered fund · Jun 30, 2026
LOOMIS SAYLES FUNDS II, not summed
14,588
34
Capital Research Global Investors
13F CIK 1422848 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
335,209
35
SMALLCAP World Fund Inc
Fund S000009599 · Registered fund · Jun 30, 2026
SMALLCAP World Fund Inc, not summed
326,172
36
NORTHERN TRUST CORP
13F CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
307,995
36.1
Small Cap Index Fund
Fund S000001245 · Registered fund · Jun 30, 2026
Northern Funds, not summed
16,753
36.2
Small Cap Core Fund
Fund S000001244 · Registered fund · Jun 30, 2026
Northern Funds, not summed
3,005
36.3
FlexShares Morningstar US Market Factor Tilt Index Fund
Fund S000033312 · Registered fund · Jul 31, 2026
FlexShares Trust, not summed
2,212
37
Allspring Global Investments Holdings, LLC
13F CIK 1890906 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
300,057
37.1
Allspring SMID Cap Growth Fund
Fund S000007345 · Registered fund · Jun 30, 2026
ALLSPRING FUNDS TRUST, not summed
79,806
37.2
Allspring Emerging Growth Fund
Fund S000015703 · Registered fund · Jul 31, 2026
ALLSPRING FUNDS TRUST, not summed
36,168
37.3
Allspring VT Small Cap Growth Fund
Fund S000007228 · Registered fund · Jun 30, 2026
Allspring VARIABLE TRUST, not summed
34,322
37.4
Allspring Small Company Growth Fund
Fund S000007361 · Registered fund · Jul 31, 2026
ALLSPRING FUNDS TRUST, not summed
32,748
37.5
Allspring VT Discovery SMID Cap Growth Fund
Fund S000007218 · Registered fund · Jun 30, 2026
Allspring VARIABLE TRUST, not summed
15,483
38
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
298,301
38.1
Schwab U.S. Small-Cap ETF
Fund S000026636 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
155,045
38.2
Schwab Small-Cap Index Fund
Fund S000005912 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
80,448
38.3
Schwab Total Stock Market Index Fund
Fund S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
21,462
38.4
Schwab U.S. Broad Market ETF
Fund S000026631 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
18,379
38.5
Schwab 1000 Index Fund
Fund S000006807 · Registered fund · Jul 31, 2026
SCHWAB INVESTMENTS, not summed
10,338
39
AMERIPRISE FINANCIAL INC
13F CIK 820027 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
292,513
39.1
Columbia Acorn Fund
Fund S000009184 · Registered fund · Jun 30, 2026
COLUMBIA ACORN TRUST, not summed
169,788
39.2
Columbia Variable Portfolio - Acorn Fund
Fund S000008981 · Registered fund · Jun 30, 2026
COLUMBIA FUNDS VARIABLE SERIES TRUST, not summed
32,689
39.3
Variable Portfolio - Partners Small Cap Growth Fund
Fund S000028697 · Registered fund · Jun 30, 2026
Columbia Funds Variable Series Trust II, not summed
9,631
39.4
Columbia Integrated Small Cap Growth Fund
Fund S000074122 · Registered fund · May 31, 2026
Columbia Funds Series Trust II, not summed
639
39.5
Columbia Research Enhanced Small Cap ETF
Fund S000095313 · Registered fund · Jun 30, 2026
Columbia ETF Trust I, not summed
55
40
WESTFIELD CAPITAL MANAGEMENT CO LP
13F CIK 1177719 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
288,924
41
JANE STREET GROUP, LLC
13F CIK 1595888 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
275,262
42
Point72 Asset Management, L.P.
13F CIK 1603466 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
273,162
43
Qube Research & Technologies Ltd
13F CIK 1729829 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
271,624
44
Rock Springs Capital Management LP
13F CIK 1595725 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
269,650
45
CITIGROUP INC
13F CIK 831001 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
249,404
46
DEUTSCHE BANK AG\
13F CIK 948046 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
238,193
46.1
DWS Large Cap Focus Growth Fund
Fund S000005707 · Registered fund · Jul 31, 2026
DEUTSCHE DWS INVESTMENT TRUST, not summed
21,800
46.2
DWS Small Cap Index VIP
Fund S000006223 · Registered fund · Jun 30, 2026
DEUTSCHE DWS INVESTMENTS VIT FUNDS, not summed
5,139
47
VANGUARD FIDUCIARY TRUST CO
13F CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
235,963
48
Harbor Small Cap Growth Fund
Fund S000000686 · Registered fund · Jul 31, 2026
HARBOR FUNDS, not summed
230,080
49
Blackford Quentin S.
Insider CIK 1612451 · Aug 10, 2026
Director, issuer-wide
226,008
50
PERCEPTIVE ADVISORS LLC
13F CIK 1224962 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
223,766

50 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 452 holders

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Key facts CIK 1388658 CUSIP 450056106 13F (30d) 33 filings 31 filers Visit website Investor relations