IRTC · iRhythm Holdings, Inc. · Shareholders & Ownership
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 positionsNo 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 | As of | Notes |
|---|---|---|---|---|
| 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 |
|
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 |
|
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 |
|
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.
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