IRTC US Equity

iRhythm Holdings, Inc.

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Health Care · Surgical & Medical Instruments & Apparatus · CIK 1388658 · FYE 1231

$117.37

+5.22 (+4.65%)

USD · as of 2026-07-28 · marketstack

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Institutional ownership· 13F filers holding IRTC · 2026-Q1 methodology → sources →

302 holders

% of shares outstanding held

108.1%

Shares held (13F)

35,524,879

Reporting holders

302

Institutional 13F holdings sum to 108.1% of shares outstanding. Readings above 100% reflect securities-lending double counting: shares on loan to short sellers are reported long by both the lending institution and the one that bought them. FINRA short interest of 2,854,326 shares (settlement 2026-04-30) accounts for the excess.

Top holders

largest 100 of 302 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	BlackRock, Inc.	2,741,5052.7M	$324M	8.34%	TRIM -3%
2	VANGUARD PORTFOLIO MANAGEMENT LLC	1,796,3721.8M	$212M	5.47%	NEW†
3	RTW INVESTMENTS, LP	1,668,5001.7M	$197M	5.08%	ADD 41%
4	MILLENNIUM MANAGEMENT LLC	1,608,0141.6M	$190M	4.89%	ADD 95%
5	Artisan Partners Limited Partnership	1,450,9071.5M	$171M	4.42%	TRIM -4%
6	VANGUARD CAPITAL MANAGEMENT LLC	1,445,7101.4M	$171M	4.40%	NEW†
7	FMR LLC	1,361,9191.4M	$161M	4.14%	ADD 117%
8	Holocene Advisors, LP	1,248,6581.2M	$147M	3.80%	ADD 83%
9	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	1,047,4521.0M	$124M	3.19%	ADD 26%
10	GEODE CAPITAL MANAGEMENT, LLC	817,110817,110	$96M	2.49%	TRIM -5%
11	STATE STREET CORP	788,302788,302	$93M	2.40%	ADD 3%
12	BNP PARIBAS ASSET MANAGEMENT Holding S.A.	762,062762,062	$90M	2.32%	ADD 31%
13	EVENTIDE ASSET MANAGEMENT, LLC	760,825760,825	$90M	2.32%	ADD 10%
14	JPMORGAN CHASE & CO	714,896714,896	$82M	2.18%	TRIM -6%
15	FULLER & THALER ASSET MANAGEMENT, INC.	674,698674,698	$80M	2.05%	TRIM -47%
16	BLAIR WILLIAM & CO/IL	628,385628,385	$74M	1.91%	TRIM -13%
17	BRAIDWELL LP	610,192610,192	$72M	1.86%	ADD 181%
18	Point72 Asset Management, L.P.	599,405599,405	$71M	1.82%	ADD 173%
19	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	582,879582,879	$69M	1.77%	TRIM -4%
20	Stephens Investment Management Group LLC	561,530561,530	$66M	1.71%	ADD 8%
21	D. E. Shaw & Co., Inc.	554,266554,266	$65M	1.69%	ADD 54%
22	Capital Research Global Investors	509,590509,590	$60M	1.55%	TRIM -57%
23	Allspring Global Investments Holdings, LLC	467,113467,113	$55M	1.42%	ADD 15%
24	BANK OF AMERICA CORP /DE/	432,539432,539	$51M	1.32%	ADD 22%
25	Polar Capital Holdings Plc	421,612421,612	$50M	1.28%	ADD 37%
26	MANUFACTURERS LIFE INSURANCE COMPANY, THE	390,577390,577	$46M	1.19%	ADD 99%
27	MACKENZIE FINANCIAL CORP	371,475371,475	$44M	1.13%	ADD 7%
28	LOOMIS SAYLES & CO L P	367,894367,894	$43M	1.12%	TRIM -6%
29	GOLDMAN SACHS GROUP INC	348,563348,563	$41M	1.06%	ADD 6%
30	Ophir Asset Management Pty Ltd	335,807335,807	$40M	1.02%	ADD 163%
31	Invesco Ltd.	297,452297,452	$35M	0.91%	TRIM -40%
32	NORTHERN TRUST CORP	285,086285,086	$34M	0.87%	ADD 2%
33	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	281,897281,897	$33M	0.86%	—
34	FRED ALGER MANAGEMENT, LLC	280,040280,040	$33M	0.85%	TRIM -10%
35	Assenagon Asset Management S.A.	270,221270,221	$32M	0.82%	ADD 20%
36	Rock Springs Capital Management LP	261,750261,750	$31M	0.80%	ADD 11%
37	SCHRODER INVESTMENT MANAGEMENT GROUP	247,746247,746	$28M	0.75%	ADD 53%
38	MORGAN STANLEY	237,799237,799	$28M	0.72%	ADD 40%
39	AMERIPRISE FINANCIAL INC	236,786236,786	$28M	0.72%	ADD 92%
40	CITIGROUP INC	232,123232,123	$27M	0.71%	ADD 22%
41	Qube Research & Technologies Ltd	226,884226,884	$27M	0.69%	ADD 57%
42	VANGUARD FIDUCIARY TRUST CO	223,699223,699	$26M	0.68%	NEW
43	DEUTSCHE BANK AG\	215,758215,758	$25M	0.66%	ADD 15%
44	SEI INVESTMENTS CO	198,904198,904	$23M	0.61%	TRIM -2%
45	Balyasny Asset Management L.P.	194,429194,429	$23M	0.59%	ADD 16%
46	BARCLAYS PLC	188,345188,345	$22M	0.57%	TRIM -3%
47	BAMCO INC /NY/	183,900183,900	$22M	0.56%	NEW
48	NEXT CENTURY GROWTH INVESTORS LLC	169,306169,306	$20M	0.52%	TRIM -2%
49	First Light Asset Management, LLC	168,116168,116	$20M	0.51%	ADD 9%
50	MASSACHUSETTS FINANCIAL SERVICES CO /MA/	166,637166,637	$20M	0.51%	ADD 11%
51	OBERWEIS ASSET MANAGEMENT INC/	156,004156,004	$18M	0.47%	ADD 30%
52	FEDERATED HERMES, INC.	149,459149,459	$18M	0.45%	ADD 40%
53	RAYMOND JAMES FINANCIAL INC	145,123145,123	$17M	0.44%	TRIM -6%
54	JENNISON ASSOCIATES LLC	137,040137,040	$16M	0.42%	—
55	FRANKLIN RESOURCES INC	121,558121,558	$14M	0.37%	ADD 3%
56	CITADEL ADVISORS LLC	113,600113,600	$13M	0.35%	NEW
57	JANE STREET GROUP, LLC	112,864112,864	$13M	0.34%	TRIM -41%
58	Nuveen, LLC	111,732111,732	$13M	0.34%	TRIM -16%
59	Trexquant Investment LP	111,311111,311	$13M	0.34%	ADD 42%
60	Bank of New York Mellon Corp	107,789107,789	$13M	0.33%	TRIM -4%
61	PERCEPTIVE ADVISORS LLC	105,026105,026	$12M	0.32%	TRIM -3%
62	WCM INVESTMENT MANAGEMENT, LLC	108,078108,078	$12M	0.33%	ADD 47%
63	NEW YORK STATE COMMON RETIREMENT FUND	102,594102,594	$12M	0.31%	TRIM -21%
64	SEGALL BRYANT & HAMILL, LLC	99,79699,796	$12M	0.30%	TRIM -11%
65	Granahan Investment Management, LLC	96,02296,022	$11M	0.29%	ADD 568%
66	UBS Group AG	91,90391,903	$11M	0.28%	TRIM -40%
67	TimesSquare Capital Management, LLC	90,65290,652	$11M	0.28%	ADD 52%
68	WELLINGTON MANAGEMENT GROUP LLP	90,46090,460	$11M	0.28%	TRIM -78%
69	Man Group plc	88,21088,210	$10M	0.27%	ADD 57%
70	Schonfeld Strategic Advisors LLC	88,13388,133	$10M	0.27%	ADD 683%
71	M&G PLC	85,06285,062	$10M	0.26%	—
72	C WorldWide Group Holding A/S	80,00080,000	$9M	0.24%	—
73	Susquehanna Portfolio Strategies, LLC	75,96175,961	$9M	0.23%	NEW
74	Thrivent Financial for Lutherans	75,16275,162	$9M	0.23%	NEW
75	FRONTIER CAPITAL MANAGEMENT CO LLC	68,45468,454	$8M	0.21%	TRIM -4%
76	PEREGRINE CAPITAL MANAGEMENT LLC	65,87565,875	$8M	0.20%	ADD 16%
77	Swiss National Bank	63,70063,700	$8M	0.19%	—
78	SILVERCREST ASSET MANAGEMENT GROUP LLC	61,68161,681	$7M	0.19%	ADD 29%
79	CANADA PENSION PLAN INVESTMENT BOARD	58,80058,800	$7M	0.18%	ADD 95%
80	ALLIANCEBERNSTEIN L.P.	36,29936,299	$6M	0.11%	TRIM -3%
81	RENAISSANCE TECHNOLOGIES LLC	53,80053,800	$6M	0.16%	TRIM -48%
82	PRINCIPAL FINANCIAL GROUP INC	53,47653,476	$6M	0.16%	TRIM -23%
83	Atle Fund Management AB	22,32222,322	$6M	0.07%	TRIM -41%
84	TWO SIGMA INVESTMENTS, LP	52,60052,600	$6M	0.16%	NEW
85	Legal & General Group Plc	51,56951,569	$6M	0.16%	—
86	Amundi	49,57549,575	$6M	0.15%	ADD 48%
87	Engineers Gate Manager LP	49,26949,269	$6M	0.15%	TRIM -36%
88	STATE OF WISCONSIN INVESTMENT BOARD	48,05048,050	$6M	0.15%	TRIM -6%
89	FIRST TRUST ADVISORS LP	47,58947,589	$6M	0.14%	TRIM -22%
90	Jump Financial, LLC	44,98444,984	$5M	0.14%	ADD 119%
91	Connor, Clark & Lunn Investment Management Ltd.	42,34642,346	$5M	0.13%	—
92	Campbell & CO Investment Adviser LLC	40,81840,818	$5M	0.12%	NEW
93	Parkman Healthcare Partners LLC	40,12540,125	$5M	0.12%	NEW
94	RHUMBLINE ADVISERS	39,42239,422	$5M	0.12%	TRIM -3%
95	CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	37,32437,324	$4M	0.11%	ADD 22%
96	PRICE T ROWE ASSOCIATES INC /MD/	35,68735,687	$4M	0.11%	TRIM -93%
97	Hillsdale Investment Management Inc.	34,95034,950	$4M	0.11%	ADD 3%
98	SIRIOS CAPITAL MANAGEMENT L P	34,74434,744	$4M	0.11%	NEW
99	AQR CAPITAL MANAGEMENT LLC	34,59034,590	$4M	0.11%	TRIM -14%
100	Verition Fund Management LLC	34,56534,565	$4M	0.11%	ADD 76%

† a filer this large appearing as NEW usually reflects a renamed or succeeded filing entity (the old name stops filing the same quarter) — not a brand-new position.

Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.

Holder trends· top 15 holders · shares held over 6 quarters

green added · red trimmed

Holder

2024-Q4

2025-Q1

2025-Q2

2025-Q3

2025-Q4

2026-Q1

Latest value

BlackRock, Inc.

2.7M

2.9M

2.8M

2.7M

$324M

VANGUARD PORTFOLIO MANAGEMENT LLC

—

1.8M

$212M

RTW INVESTMENTS, LP

—

1.2M

1.7M

$197M

MILLENNIUM MANAGEMENT LLC

60K

400K

336K

278K

826K

1.6M

$190M

Artisan Partners Limited Partnership

2.8M

2.7M

2.6M

1.5M

$171M

VANGUARD CAPITAL MANAGEMENT LLC

—

1.4M

$171M

FMR LLC

475K

463K

420K

624K

629K

1.4M

$161M

Holocene Advisors, LP

86K

15K

313K

473K

684K

1.2M

$147M

UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC

335K

903K

608K

570K

830K

1.0M

$124M

GEODE CAPITAL MANAGEMENT, LLC

731K

750K

767K

790K

858K

817K

$96M

STATE STREET CORP

949K

918K

869K

848K

765K

788K

$93M

BNP PARIBAS ASSET MANAGEMENT Holding S.A.

900K

880K

735K

570K

583K

762K

$90M

EVENTIDE ASSET MANAGEMENT, LLC

739K

740K

692K

761K

$90M

JPMORGAN CHASE & CO

707K

563K

879K

759K

715K

$82M

FULLER & THALER ASSET MANAGEMENT, INC.

—

518K

586K

595K

1.3M

675K

$80M

Shares reported each quarter by the largest current holders. Green = added vs the prior filing, red = trimmed, grey = roughly held; a dash is a quarter with no 13F on file (a gap is skipped, not read as an exit). 13F is filed up to 45 days after quarter-end. Up to 40 quarters (10 years) available — use the selector above.

Institutional footprint by quarter

Line breaks are honest gaps — quarters with no 13F record, or a suppressed % — never interpolated. % of shares outstanding uses today's share count for every quarter (the only count stored).

Quarter	Holders	Shares held	% shares out	Value held
2026-Q1	302	35,524,879	108.1%	$4.2B
2025-Q4	334	35,836,311	109.0%	$6.4B
2025-Q3	337	35,145,117	106.9%	$6.0B
2025-Q2	304	35,468,658	107.9%	$5.5B
2025-Q1	256	35,991,795	109.5%	$3.8B
2024-Q4	227

Short interest has its own tab now — open SI →

Source: SEC Form 13F — every institution manager (≥ $100M in 13F securities) reporting a long US-listed position, across ~10,250 filers over 10 years of history. 13F is long-only, US-listed, filed up to 45 days after quarter-end.

Activists & large holders· Schedule 13D/G beneficial owners · IRTC

Large holders — 13G, passive (top 5 of 8 by % of class)

Holder

% of class

Type

As of

VANGUARD PORTFOLIO MANAGEMENT LLC

5.64%

QII

2026-03-31

SEC →

VANGUARD CAPITAL MANAGEMENT LLC

5.23%

QII

2026-03-31

SEC →

RTW INVESTMENTS, LP

5.2%

QII

2026-03-31

SEC →

MILLENNIUM MANAGEMENT LLC

5.1%

Passive

2026-03-16

SEC →

Artisan Partners Limited Partnership

4.7%

QII

Institutional ownership· 13F filers holding IRTC · 2026-Q1 methodology → sources →

302 holders

% of shares outstanding held

108.1%

Shares held (13F)

35,524,879

Reporting holders

302

Top holders

largest 100 of 302 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	BlackRock, Inc.	2,741,5052.7M	$324M	8.34%	TRIM -3%
2	VANGUARD PORTFOLIO MANAGEMENT LLC	1,796,3721.8M	$212M	5.47%	NEW†
3	RTW INVESTMENTS, LP	1,668,5001.7M	$197M	5.08%	ADD 41%
4	MILLENNIUM MANAGEMENT LLC	1,608,0141.6M	$190M	4.89%	ADD 95%
5	Artisan Partners Limited Partnership	1,450,9071.5M	$171M	4.42%	TRIM -4%
6	VANGUARD CAPITAL MANAGEMENT LLC	1,445,7101.4M	$171M	4.40%	NEW†
7	FMR LLC	1,361,9191.4M	$161M	4.14%	ADD 117%
8	Holocene Advisors, LP	1,248,6581.2M	$147M	3.80%	ADD 83%
9	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	1,047,4521.0M	$124M	3.19%	ADD 26%
10	GEODE CAPITAL MANAGEMENT, LLC	817,110817,110	$96M	2.49%	TRIM -5%
11	STATE STREET CORP	788,302788,302	$93M	2.40%	ADD 3%
12	BNP PARIBAS ASSET MANAGEMENT Holding S.A.	762,062762,062	$90M	2.32%	ADD 31%
13	EVENTIDE ASSET MANAGEMENT, LLC	760,825760,825	$90M	2.32%	ADD 10%
14	JPMORGAN CHASE & CO	714,896714,896	$82M	2.18%	TRIM -6%
15	FULLER & THALER ASSET MANAGEMENT, INC.	674,698674,698	$80M	2.05%	TRIM -47%
16	BLAIR WILLIAM & CO/IL	628,385628,385	$74M	1.91%	TRIM -13%
17	BRAIDWELL LP	610,192610,192	$72M	1.86%	ADD 181%
18	Point72 Asset Management, L.P.	599,405599,405	$71M	1.82%	ADD 173%
19	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	582,879582,879	$69M	1.77%	TRIM -4%
20	Stephens Investment Management Group LLC	561,530561,530	$66M	1.71%	ADD 8%
21	D. E. Shaw & Co., Inc.	554,266554,266	$65M	1.69%	ADD 54%
22	Capital Research Global Investors	509,590509,590	$60M	1.55%	TRIM -57%
23	Allspring Global Investments Holdings, LLC	467,113467,113	$55M	1.42%	ADD 15%
24	BANK OF AMERICA CORP /DE/	432,539432,539	$51M	1.32%	ADD 22%
25	Polar Capital Holdings Plc	421,612421,612	$50M	1.28%	ADD 37%
26	MANUFACTURERS LIFE INSURANCE COMPANY, THE	390,577390,577	$46M	1.19%	ADD 99%
27	MACKENZIE FINANCIAL CORP	371,475371,475	$44M	1.13%	ADD 7%
28	LOOMIS SAYLES & CO L P	367,894367,894	$43M	1.12%	TRIM -6%
29	GOLDMAN SACHS GROUP INC	348,563348,563	$41M	1.06%	ADD 6%
30	Ophir Asset Management Pty Ltd	335,807335,807	$40M	1.02%	ADD 163%
31	Invesco Ltd.	297,452297,452	$35M	0.91%	TRIM -40%
32	NORTHERN TRUST CORP	285,086285,086	$34M	0.87%	ADD 2%
33	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	281,897281,897	$33M	0.86%	—
34	FRED ALGER MANAGEMENT, LLC	280,040280,040	$33M	0.85%	TRIM -10%
35	Assenagon Asset Management S.A.	270,221270,221	$32M	0.82%	ADD 20%
36	Rock Springs Capital Management LP	261,750261,750	$31M	0.80%	ADD 11%
37	SCHRODER INVESTMENT MANAGEMENT GROUP	247,746247,746	$28M	0.75%	ADD 53%
38	MORGAN STANLEY	237,799237,799	$28M	0.72%	ADD 40%
39	AMERIPRISE FINANCIAL INC	236,786236,786	$28M	0.72%	ADD 92%
40	CITIGROUP INC	232,123232,123	$27M	0.71%	ADD 22%
41	Qube Research & Technologies Ltd	226,884226,884	$27M	0.69%	ADD 57%
42	VANGUARD FIDUCIARY TRUST CO	223,699223,699	$26M	0.68%	NEW
43	DEUTSCHE BANK AG\	215,758215,758	$25M	0.66%	ADD 15%
44	SEI INVESTMENTS CO	198,904198,904	$23M	0.61%	TRIM -2%
45	Balyasny Asset Management L.P.	194,429194,429	$23M	0.59%	ADD 16%
46	BARCLAYS PLC	188,345188,345	$22M	0.57%	TRIM -3%
47	BAMCO INC /NY/	183,900183,900	$22M	0.56%	NEW
48	NEXT CENTURY GROWTH INVESTORS LLC	169,306169,306	$20M	0.52%	TRIM -2%
49	First Light Asset Management, LLC	168,116168,116	$20M	0.51%	ADD 9%
50	MASSACHUSETTS FINANCIAL SERVICES CO /MA/	166,637166,637	$20M	0.51%	ADD 11%
51	OBERWEIS ASSET MANAGEMENT INC/	156,004156,004	$18M	0.47%	ADD 30%
52	FEDERATED HERMES, INC.	149,459149,459	$18M	0.45%	ADD 40%
53	RAYMOND JAMES FINANCIAL INC	145,123145,123	$17M	0.44%	TRIM -6%
54	JENNISON ASSOCIATES LLC	137,040137,040	$16M	0.42%	—
55	FRANKLIN RESOURCES INC	121,558121,558	$14M	0.37%	ADD 3%
56	CITADEL ADVISORS LLC	113,600113,600	$13M	0.35%	NEW
57	JANE STREET GROUP, LLC	112,864112,864	$13M	0.34%	TRIM -41%
58	Nuveen, LLC	111,732111,732	$13M	0.34%	TRIM -16%
59	Trexquant Investment LP	111,311111,311	$13M	0.34%	ADD 42%
60	Bank of New York Mellon Corp	107,789107,789	$13M	0.33%	TRIM -4%
61	PERCEPTIVE ADVISORS LLC	105,026105,026	$12M	0.32%	TRIM -3%
62	WCM INVESTMENT MANAGEMENT, LLC	108,078108,078	$12M	0.33%	ADD 47%
63	NEW YORK STATE COMMON RETIREMENT FUND	102,594102,594	$12M	0.31%	TRIM -21%
64	SEGALL BRYANT & HAMILL, LLC	99,79699,796	$12M	0.30%	TRIM -11%
65	Granahan Investment Management, LLC	96,02296,022	$11M	0.29%	ADD 568%
66	UBS Group AG	91,90391,903	$11M	0.28%	TRIM -40%
67	TimesSquare Capital Management, LLC	90,65290,652	$11M	0.28%	ADD 52%
68	WELLINGTON MANAGEMENT GROUP LLP	90,46090,460	$11M	0.28%	TRIM -78%
69	Man Group plc	88,21088,210	$10M	0.27%	ADD 57%
70	Schonfeld Strategic Advisors LLC	88,13388,133	$10M	0.27%	ADD 683%
71	M&G PLC	85,06285,062	$10M	0.26%	—
72	C WorldWide Group Holding A/S	80,00080,000	$9M	0.24%	—
73	Susquehanna Portfolio Strategies, LLC	75,96175,961	$9M	0.23%	NEW
74	Thrivent Financial for Lutherans	75,16275,162	$9M	0.23%	NEW
75	FRONTIER CAPITAL MANAGEMENT CO LLC	68,45468,454	$8M	0.21%	TRIM -4%
76	PEREGRINE CAPITAL MANAGEMENT LLC	65,87565,875	$8M	0.20%	ADD 16%
77	Swiss National Bank	63,70063,700	$8M	0.19%	—
78	SILVERCREST ASSET MANAGEMENT GROUP LLC	61,68161,681	$7M	0.19%	ADD 29%
79	CANADA PENSION PLAN INVESTMENT BOARD	58,80058,800	$7M	0.18%	ADD 95%
80	ALLIANCEBERNSTEIN L.P.	36,29936,299	$6M	0.11%	TRIM -3%
81	RENAISSANCE TECHNOLOGIES LLC	53,80053,800	$6M	0.16%	TRIM -48%
82	PRINCIPAL FINANCIAL GROUP INC	53,47653,476	$6M	0.16%	TRIM -23%
83	Atle Fund Management AB	22,32222,322	$6M	0.07%	TRIM -41%
84	TWO SIGMA INVESTMENTS, LP	52,60052,600	$6M	0.16%	NEW
85	Legal & General Group Plc	51,56951,569	$6M	0.16%	—
86	Amundi	49,57549,575	$6M	0.15%	ADD 48%
87	Engineers Gate Manager LP	49,26949,269	$6M	0.15%	TRIM -36%
88	STATE OF WISCONSIN INVESTMENT BOARD	48,05048,050	$6M	0.15%	TRIM -6%
89	FIRST TRUST ADVISORS LP	47,58947,589	$6M	0.14%	TRIM -22%
90	Jump Financial, LLC	44,98444,984	$5M	0.14%	ADD 119%
91	Connor, Clark & Lunn Investment Management Ltd.	42,34642,346	$5M	0.13%	—
92	Campbell & CO Investment Adviser LLC	40,81840,818	$5M	0.12%	NEW
93	Parkman Healthcare Partners LLC	40,12540,125	$5M	0.12%	NEW
94	RHUMBLINE ADVISERS	39,42239,422	$5M	0.12%	TRIM -3%
95	CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	37,32437,324	$4M	0.11%	ADD 22%
96	PRICE T ROWE ASSOCIATES INC /MD/	35,68735,687	$4M	0.11%	TRIM -93%
97	Hillsdale Investment Management Inc.	34,95034,950	$4M	0.11%	ADD 3%
98	SIRIOS CAPITAL MANAGEMENT L P	34,74434,744	$4M	0.11%	NEW
99	AQR CAPITAL MANAGEMENT LLC	34,59034,590	$4M	0.11%	TRIM -14%
100	Verition Fund Management LLC	34,56534,565	$4M	0.11%	ADD 76%

† a filer this large appearing as NEW usually reflects a renamed or succeeded filing entity (the old name stops filing the same quarter) — not a brand-new position.

Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.

Holder trends· top 15 holders · shares held over 6 quarters

green added · red trimmed

Holder

2024-Q4

2025-Q1

2025-Q2

2025-Q3

2025-Q4

2026-Q1

Latest value

BlackRock, Inc.

2.7M

2.9M

2.8M

2.7M

$324M

VANGUARD PORTFOLIO MANAGEMENT LLC

—

1.8M

$212M

RTW INVESTMENTS, LP

—

1.2M

1.7M

$197M

MILLENNIUM MANAGEMENT LLC

60K

400K

336K

278K

826K

1.6M

$190M

Artisan Partners Limited Partnership

2.8M

2.7M

2.6M

1.5M

$171M

VANGUARD CAPITAL MANAGEMENT LLC

—

1.4M

$171M

FMR LLC

475K

463K

420K

624K

629K

1.4M

$161M

Holocene Advisors, LP

86K

15K

313K

473K

684K

1.2M

$147M

UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC

335K

903K

608K

570K

830K

1.0M

$124M

GEODE CAPITAL MANAGEMENT, LLC

731K

750K

767K

790K

858K

817K

$96M

STATE STREET CORP

949K

918K

869K

848K

765K

788K

$93M

BNP PARIBAS ASSET MANAGEMENT Holding S.A.

900K

880K

735K

570K

583K

762K

$90M

EVENTIDE ASSET MANAGEMENT, LLC

739K

740K

692K

761K

$90M

JPMORGAN CHASE & CO

707K

563K

879K

759K

715K

$82M

FULLER & THALER ASSET MANAGEMENT, INC.

—

518K

586K

595K

1.3M

675K

$80M

Institutional footprint by quarter

Line breaks are honest gaps — quarters with no 13F record, or a suppressed % — never interpolated. % of shares outstanding uses today's share count for every quarter (the only count stored).

Quarter	Holders	Shares held	% shares out	Value held
2026-Q1	302	35,524,879	108.1%	$4.2B
2025-Q4	334	35,836,311	109.0%	$6.4B
2025-Q3	337	35,145,117	106.9%	$6.0B
2025-Q2	304	35,468,658	107.9%	$5.5B
2025-Q1	256	35,991,795	109.5%	$3.8B
2024-Q4	227

Short interest has its own tab now — open SI →

Activists & large holders· Schedule 13D/G beneficial owners · IRTC

Large holders — 13G, passive (top 5 of 8 by % of class)

Holder

% of class

Type

As of

VANGUARD PORTFOLIO MANAGEMENT LLC

5.64%

QII

2026-03-31

SEC →

VANGUARD CAPITAL MANAGEMENT LLC

5.23%

QII

2026-03-31

SEC →

RTW INVESTMENTS, LP

5.2%

QII

2026-03-31

SEC →

MILLENNIUM MANAGEMENT LLC

5.1%

Passive

2026-03-16

SEC →

Artisan Partners Limited Partnership

4.7%

QII

IRTC US Equity☆

Institutional ownership· 13F filers holding IRTC · 2026-Q1 methodology → sources →

Top holders

Holder trends· top 15 holders · shares held over 6 quarters

Institutional footprint by quarter

Activists & large holders· Schedule 13D/G beneficial owners · IRTC

Institutional ownership· 13F filers holding IRTC · 2026-Q1 methodology → sources →

Top holders

Holder trends· top 15 holders · shares held over 6 quarters

Institutional footprint by quarter

Activists & large holders· Schedule 13D/G beneficial owners · IRTC

IRTC US Equity