SEM US Equity

SELECT MEDICAL HOLDINGS CORP

NYSEdelisted+ Compare Tear sheet →

Health Care · Services-Hospitals · CIK 1320414 · FYE 1231

$16.51

—

USD · final close, as of 2026-06-30 · marketstack

Delisted — merged 2026-07-01

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

276 holders

% of shares outstanding held

78.8%

Shares held (13F)

97,775,393

Reporting holders

276

Top holders

largest 100 of 276 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	BlackRock, Inc.	17,263,32717.3M	$281M	13.92%	TRIM -8%
2	VANGUARD PORTFOLIO MANAGEMENT LLC	6,723,5576.7M	$110M	5.42%	NEW†
3	DIMENSIONAL FUND ADVISORS LP	5,536,3315.5M	$90M	4.46%	ADD 4%
4	FIL Ltd	4,960,7325.0M	$81M	4.00%	NEW†
5	VANGUARD CAPITAL MANAGEMENT LLC	4,819,6854.8M	$79M	3.89%	NEW†
6	STATE STREET CORP	4,319,8774.3M	$70M	3.48%	—
7	GEODE CAPITAL MANAGEMENT, LLC	2,661,9442.7M	$43M	2.15%	TRIM -15%
8	HSBC HOLDINGS PLC	2,245,1632.2M	$37M	1.81%	ADD 3727%
9	GOLDMAN SACHS GROUP INC	2,081,8832.1M	$34M	1.68%	ADD 319%
10	T. Rowe Price Investment Management, Inc.	2,032,3922.0M	$33M	1.64%	TRIM -48%
11	SOROS FUND MANAGEMENT LLC	1,833,4731.8M	$30M	1.48%	NEW
12	AQR Arbitrage LLC	1,798,3601.8M	$29M	1.45%	NEW
13	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	1,704,6031.7M	$28M	1.37%	—
14	Qube Research & Technologies Ltd	1,495,4331.5M	$24M	1.21%	ADD 708%
15	NEXPOINT ASSET MANAGEMENT, L.P.	1,478,7701.5M	$24M	1.19%	NEW
16	Polar Asset Management Partners Inc.	1,400,0001.4M	$23M	1.13%	NEW
17	NORTHERN TRUST CORP	1,366,8821.4M	$22M	1.10%	ADD 6%
18	D. E. Shaw & Co., Inc.	1,360,9251.4M	$22M	1.10%	TRIM -38%
19	Woodline Partners LP	1,226,1951.2M	$20M	0.99%	TRIM -9%
20	ALPINE ASSOCIATES MANAGEMENT INC.	1,176,7001.2M	$19M	0.95%	NEW
21	TIG Advisors, LLC	1,071,0461.1M	$17M	0.86%	ADD 1319%
22	Bank of New York Mellon Corp	1,067,6401.1M	$17M	0.86%	—
23	Grantham, Mayo, Van Otterloo & Co. LLC	986,809986,809	$16M	0.80%	NEW
24	Invesco Ltd.	934,413934,413	$15M	0.75%	TRIM -9%
25	Balyasny Asset Management L.P.	904,737904,737	$15M	0.73%	ADD 1502%
26	MILLENNIUM MANAGEMENT LLC	853,442853,442	$14M	0.69%	ADD 56%
27	MORGAN STANLEY	851,429851,429	$14M	0.69%	TRIM -12%
28	VANGUARD FIDUCIARY TRUST CO	709,077709,077	$12M	0.57%	NEW
29	Dana Investment Advisors, Inc.	676,987676,987	$11M	0.55%	—
30	ADAGE CAPITAL PARTNERS GP, L.L.C.	658,467658,467	$11M	0.53%	TRIM -44%
31	BANK OF AMERICA CORP /DE/	639,398639,398	$10M	0.52%	TRIM -51%
32	Cambria Investment Management, L.P.	553,728553,728	$9M	0.45%	—
33	GARDNER LEWIS ASSET MANAGEMENT L P	551,920551,920	$9M	0.45%	NEW
34	PRINCIPAL FINANCIAL GROUP INC	535,625535,625	$9M	0.43%	—
35	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	528,194528,194	$9M	0.43%	ADD 44%
36	PICTON MAHONEY ASSET MANAGEMENT	500,000500,000	$8M	0.40%	NEW
37	VICTORY CAPITAL MANAGEMENT INC	435,643435,643	$7M	0.35%	ADD 21%
38	Public Sector Pension Investment Board	394,194394,194	$6M	0.32%	ADD 3%
39	TWO SIGMA INVESTMENTS, LP	385,804385,804	$6M	0.31%	ADD 5%
40	CAXTON ASSOCIATES LLP	349,564349,564	$6M	0.28%	ADD 1869%
41	RHUMBLINE ADVISERS	316,066316,066	$5M	0.25%	—
42	BRIDGEWAY CAPITAL MANAGEMENT, LLC	312,836312,836	$5M	0.25%	TRIM -60%
43	HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND	300,000300,000	$5M	0.24%	NEW
44	Man Group plc	300,000300,000	$5M	0.24%	NEW
45	JPMORGAN CHASE & CO	290,638290,638	$5M	0.23%	ADD 31%
46	Groupe la Francaise	282,497282,497	$5M	0.23%	NEW
47	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	271,754271,754	$4M	0.22%	ADD 5%
48	Squarepoint Ops LLC	270,752270,752	$4M	0.22%	ADD 536%
49	DENALI ADVISORS LLC	263,100263,100	$4M	0.21%	—
50	Legal & General Group Plc	262,383262,383	$4M	0.21%	TRIM -8%
51	UBS Group AG	257,440257,440	$4M	0.21%	ADD 36%
52	Nuveen, LLC	233,085233,085	$4M	0.19%	ADD 2%
53	FIRST TRUST ADVISORS LP	232,046232,046	$4M	0.19%	TRIM -25%
54	SG Americas Securities, LLC	231,988231,988	$4M	0.19%	ADD 544%
55	PRELUDE CAPITAL MANAGEMENT, LLC	231,705231,705	$4M	0.19%	NEW
56	Swiss National Bank	220,100220,100	$4M	0.18%	—
57	Capula Management Ltd	206,810206,810	$3M	0.17%	NEW
58	AMERIPRISE FINANCIAL INC	185,824185,824	$3M	0.15%	TRIM -26%
59	STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM	178,230178,230	$3M	0.14%	ADD 9%
60	CLOUGH CAPITAL PARTNERS L P	173,010173,010	$3M	0.14%	—
61	GABELLI FUNDS LLC	173,000173,000	$3M	0.14%	NEW
62	CREDIT INDUSTRIEL ET COMMERCIAL	167,503167,503	$3M	0.14%	NEW
63	PRICE T ROWE ASSOCIATES INC /MD/	165,144165,144	$3M	0.13%	TRIM -99%
64	Larson Financial Group LLC	161,326161,326	$3M	0.13%	ADD 14%
65	Empowered Funds, LLC	159,689159,689	$3M	0.13%	TRIM -66%
66	HRT FINANCIAL LP	159,632159,632	$3M	0.13%	ADD 114%
67	OMERS ADMINISTRATION Corp	159,400159,400	$3M	0.13%	NEW
68	WOLVERINE ASSET MANAGEMENT LLC	155,190155,190	$3M	0.13%	NEW
69	Hudson Bay Capital Management LP	150,970150,970	$2M	0.12%	NEW
70	MOORE CAPITAL MANAGEMENT, LP	145,500145,500	$2M	0.12%	ADD 482%
71	Versor Investments LP	144,727144,727	$2M	0.12%	NEW
72	GABELLI & Co INVESTMENT ADVISERS, INC.	140,650140,650	$2M	0.11%	NEW
73	ALLIANCEBERNSTEIN L.P.	151,668151,668	$2M	0.12%	—
74	Atom Investors LP	136,415136,415	$2M	0.11%	TRIM -46%
75	CITIGROUP INC	136,009136,009	$2M	0.11%	ADD 324%
76	TEACHER RETIREMENT SYSTEM OF TEXAS	130,785130,785	$2M	0.11%	ADD 9%
77	Y-Intercept (Hong Kong) Ltd	123,005123,005	$2M	0.10%	ADD 16%
78	Russell Investments Group, Ltd.	122,583122,583	$2M	0.10%	TRIM -10%
79	Linden Thomas Advisory Services, LLC	118,519118,519	$2M	0.10%	ADD 95%
80	PRUDENTIAL FINANCIAL INC	113,490113,490	$2M	0.09%	TRIM -13%
81	JANE STREET GROUP, LLC	111,408111,408	$2M	0.09%	TRIM -57%
82	AQR CAPITAL MANAGEMENT LLC	109,584109,584	$2M	0.09%	ADD 25%
83	VANGUARD ASSET MANAGEMENT, Ltd	106,079106,079	$2M	0.09%	NEW
84	First Trust Capital Management L.P.	105,446105,446	$2M	0.09%	NEW
85	CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	105,245105,245	$2M	0.08%	—
86	WATER ISLAND CAPITAL LLC	103,467103,467	$2M	0.08%	NEW
87	OCCUDO QUANTITATIVE STRATEGIES LP	102,636102,636	$2M	0.08%	NEW
88	OP Asset Management Ltd	101,953101,953	$2M	0.08%	NEW
89	NEW YORK STATE COMMON RETIREMENT FUND	99,37799,377	$2M	0.08%	—
90	DEUTSCHE BANK AG\	98,88398,883	$2M	0.08%	ADD 12%
91	CANADA LIFE ASSURANCE Co	91,89691,896	$1M	0.07%	TRIM -5%
92	FRANKLIN RESOURCES INC	85,24985,249	$1M	0.07%	TRIM -41%
93	Brevan Howard Capital Management LP	82,02782,027	$1M	0.07%	ADD 104%
94	COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS	77,25177,251	$1M	0.06%	ADD 183%
95	Thrivent Financial for Lutherans	73,75373,753	$1M	0.06%	TRIM -3%
96	Voleon Capital Management LP	69,81269,812	$1M	0.06%	TRIM -53%
97	Blackstone Inc.	65,82565,825	$1M	0.05%	NEW
98	Jump Financial, LLC	65,49065,490	$1M	0.05%	ADD 3%
99	Engineers Gate Manager LP	63,53963,539	$1M	0.05%	ADD 239%
100	Schonfeld Strategic Advisors LLC	63,11063,110	$1M	0.05%	TRIM -66%

† 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.

20.0M

20.1M

19.5M

19.1M

18.7M

17.3M

$281M

VANGUARD PORTFOLIO MANAGEMENT LLC

—

6.7M

$110M

DIMENSIONAL FUND ADVISORS LP

4.4M

4.2M

5.0M

5.2M

5.3M

5.5M

$90M

FIL Ltd

—

5.0M

$81M

VANGUARD CAPITAL MANAGEMENT LLC

—

4.8M

$79M

STATE STREET CORP

4.3M

4.2M

4.3M

4.4M

4.3M

$70M

GEODE CAPITAL MANAGEMENT, LLC

2.4M

3.0M

3.1M

2.7M

$43M

HSBC HOLDINGS PLC

92K

94K

82K

28K

59K

2.2M

$37M

GOLDMAN SACHS GROUP INC

582K

729K

478K

759K

497K

2.1M

$34M

T. Rowe Price Investment Management, Inc.

4.4M

4.0M

3.6M

2.9M

3.9M

2.0M

$33M

SOROS FUND MANAGEMENT LLC

—

1.8M

$30M

AQR Arbitrage LLC

—

1.8M

$29M

CHARLES SCHWAB INVESTMENT MANAGEMENT INC

1.7M

1.6M

1.7M

$28M

Qube Research & Technologies Ltd

162K

44K

—

576K

185K

1.5M

$24M

NEXPOINT ASSET MANAGEMENT, L.P.

—

1.5M

$24M

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	276	97,775,393	78.8%	$1.5B
2025-Q4

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 · SEM

Activists — 13D, active intent

ORTENZIO ROBERT A0%EXITEDSCHEDULE 13D/A · Amd 3 · event 2026-07-01SEC →

0 shares · 3 reporting persons

“Item 4 of the Original Schedule 13D is hereby amended and supplemented to incorporate the following: Closing On June 30, 2026, the Issuer announced the consummation of the transactions contemplated by the Merger Agreement. Effective July 1, 2026, Merger Sub merged with and into the Issuer, with the Issuer continuing as the surviving corporation. At the Effective Time, each Share issued and outstanding immediately prior to the Effective Time (other than Rollover Shares, Shares owned by Parent or ”

Large holders — 13G, passive (top 5 of 6 by % of class)

Holder	% of class	Type	As of
BlackRock, Inc.	12.4%	QII	2025-03-31	SEC →
VANGUARD PORTFOLIO MANAGEMENT LLC	5.45%	QII	2026-03-31	SEC →

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

276 holders

% of shares outstanding held

78.8%

Shares held (13F)

97,775,393

Reporting holders

276

Top holders

largest 100 of 276 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	BlackRock, Inc.	17,263,32717.3M	$281M	13.92%	TRIM -8%
2	VANGUARD PORTFOLIO MANAGEMENT LLC	6,723,5576.7M	$110M	5.42%	NEW†
3	DIMENSIONAL FUND ADVISORS LP	5,536,3315.5M	$90M	4.46%	ADD 4%
4	FIL Ltd	4,960,7325.0M	$81M	4.00%	NEW†
5	VANGUARD CAPITAL MANAGEMENT LLC	4,819,6854.8M	$79M	3.89%	NEW†
6	STATE STREET CORP	4,319,8774.3M	$70M	3.48%	—
7	GEODE CAPITAL MANAGEMENT, LLC	2,661,9442.7M	$43M	2.15%	TRIM -15%
8	HSBC HOLDINGS PLC	2,245,1632.2M	$37M	1.81%	ADD 3727%
9	GOLDMAN SACHS GROUP INC	2,081,8832.1M	$34M	1.68%	ADD 319%
10	T. Rowe Price Investment Management, Inc.	2,032,3922.0M	$33M	1.64%	TRIM -48%
11	SOROS FUND MANAGEMENT LLC	1,833,4731.8M	$30M	1.48%	NEW
12	AQR Arbitrage LLC	1,798,3601.8M	$29M	1.45%	NEW
13	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	1,704,6031.7M	$28M	1.37%	—
14	Qube Research & Technologies Ltd	1,495,4331.5M	$24M	1.21%	ADD 708%
15	NEXPOINT ASSET MANAGEMENT, L.P.	1,478,7701.5M	$24M	1.19%	NEW
16	Polar Asset Management Partners Inc.	1,400,0001.4M	$23M	1.13%	NEW
17	NORTHERN TRUST CORP	1,366,8821.4M	$22M	1.10%	ADD 6%
18	D. E. Shaw & Co., Inc.	1,360,9251.4M	$22M	1.10%	TRIM -38%
19	Woodline Partners LP	1,226,1951.2M	$20M	0.99%	TRIM -9%
20	ALPINE ASSOCIATES MANAGEMENT INC.	1,176,7001.2M	$19M	0.95%	NEW
21	TIG Advisors, LLC	1,071,0461.1M	$17M	0.86%	ADD 1319%
22	Bank of New York Mellon Corp	1,067,6401.1M	$17M	0.86%	—
23	Grantham, Mayo, Van Otterloo & Co. LLC	986,809986,809	$16M	0.80%	NEW
24	Invesco Ltd.	934,413934,413	$15M	0.75%	TRIM -9%
25	Balyasny Asset Management L.P.	904,737904,737	$15M	0.73%	ADD 1502%
26	MILLENNIUM MANAGEMENT LLC	853,442853,442	$14M	0.69%	ADD 56%
27	MORGAN STANLEY	851,429851,429	$14M	0.69%	TRIM -12%
28	VANGUARD FIDUCIARY TRUST CO	709,077709,077	$12M	0.57%	NEW
29	Dana Investment Advisors, Inc.	676,987676,987	$11M	0.55%	—
30	ADAGE CAPITAL PARTNERS GP, L.L.C.	658,467658,467	$11M	0.53%	TRIM -44%
31	BANK OF AMERICA CORP /DE/	639,398639,398	$10M	0.52%	TRIM -51%
32	Cambria Investment Management, L.P.	553,728553,728	$9M	0.45%	—
33	GARDNER LEWIS ASSET MANAGEMENT L P	551,920551,920	$9M	0.45%	NEW
34	PRINCIPAL FINANCIAL GROUP INC	535,625535,625	$9M	0.43%	—
35	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	528,194528,194	$9M	0.43%	ADD 44%
36	PICTON MAHONEY ASSET MANAGEMENT	500,000500,000	$8M	0.40%	NEW
37	VICTORY CAPITAL MANAGEMENT INC	435,643435,643	$7M	0.35%	ADD 21%
38	Public Sector Pension Investment Board	394,194394,194	$6M	0.32%	ADD 3%
39	TWO SIGMA INVESTMENTS, LP	385,804385,804	$6M	0.31%	ADD 5%
40	CAXTON ASSOCIATES LLP	349,564349,564	$6M	0.28%	ADD 1869%
41	RHUMBLINE ADVISERS	316,066316,066	$5M	0.25%	—
42	BRIDGEWAY CAPITAL MANAGEMENT, LLC	312,836312,836	$5M	0.25%	TRIM -60%
43	HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND	300,000300,000	$5M	0.24%	NEW
44	Man Group plc	300,000300,000	$5M	0.24%	NEW
45	JPMORGAN CHASE & CO	290,638290,638	$5M	0.23%	ADD 31%
46	Groupe la Francaise	282,497282,497	$5M	0.23%	NEW
47	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	271,754271,754	$4M	0.22%	ADD 5%
48	Squarepoint Ops LLC	270,752270,752	$4M	0.22%	ADD 536%
49	DENALI ADVISORS LLC	263,100263,100	$4M	0.21%	—
50	Legal & General Group Plc	262,383262,383	$4M	0.21%	TRIM -8%
51	UBS Group AG	257,440257,440	$4M	0.21%	ADD 36%
52	Nuveen, LLC	233,085233,085	$4M	0.19%	ADD 2%
53	FIRST TRUST ADVISORS LP	232,046232,046	$4M	0.19%	TRIM -25%
54	SG Americas Securities, LLC	231,988231,988	$4M	0.19%	ADD 544%
55	PRELUDE CAPITAL MANAGEMENT, LLC	231,705231,705	$4M	0.19%	NEW
56	Swiss National Bank	220,100220,100	$4M	0.18%	—
57	Capula Management Ltd	206,810206,810	$3M	0.17%	NEW
58	AMERIPRISE FINANCIAL INC	185,824185,824	$3M	0.15%	TRIM -26%
59	STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM	178,230178,230	$3M	0.14%	ADD 9%
60	CLOUGH CAPITAL PARTNERS L P	173,010173,010	$3M	0.14%	—
61	GABELLI FUNDS LLC	173,000173,000	$3M	0.14%	NEW
62	CREDIT INDUSTRIEL ET COMMERCIAL	167,503167,503	$3M	0.14%	NEW
63	PRICE T ROWE ASSOCIATES INC /MD/	165,144165,144	$3M	0.13%	TRIM -99%
64	Larson Financial Group LLC	161,326161,326	$3M	0.13%	ADD 14%
65	Empowered Funds, LLC	159,689159,689	$3M	0.13%	TRIM -66%
66	HRT FINANCIAL LP	159,632159,632	$3M	0.13%	ADD 114%
67	OMERS ADMINISTRATION Corp	159,400159,400	$3M	0.13%	NEW
68	WOLVERINE ASSET MANAGEMENT LLC	155,190155,190	$3M	0.13%	NEW
69	Hudson Bay Capital Management LP	150,970150,970	$2M	0.12%	NEW
70	MOORE CAPITAL MANAGEMENT, LP	145,500145,500	$2M	0.12%	ADD 482%
71	Versor Investments LP	144,727144,727	$2M	0.12%	NEW
72	GABELLI & Co INVESTMENT ADVISERS, INC.	140,650140,650	$2M	0.11%	NEW
73	ALLIANCEBERNSTEIN L.P.	151,668151,668	$2M	0.12%	—
74	Atom Investors LP	136,415136,415	$2M	0.11%	TRIM -46%
75	CITIGROUP INC	136,009136,009	$2M	0.11%	ADD 324%
76	TEACHER RETIREMENT SYSTEM OF TEXAS	130,785130,785	$2M	0.11%	ADD 9%
77	Y-Intercept (Hong Kong) Ltd	123,005123,005	$2M	0.10%	ADD 16%
78	Russell Investments Group, Ltd.	122,583122,583	$2M	0.10%	TRIM -10%
79	Linden Thomas Advisory Services, LLC	118,519118,519	$2M	0.10%	ADD 95%
80	PRUDENTIAL FINANCIAL INC	113,490113,490	$2M	0.09%	TRIM -13%
81	JANE STREET GROUP, LLC	111,408111,408	$2M	0.09%	TRIM -57%
82	AQR CAPITAL MANAGEMENT LLC	109,584109,584	$2M	0.09%	ADD 25%
83	VANGUARD ASSET MANAGEMENT, Ltd	106,079106,079	$2M	0.09%	NEW
84	First Trust Capital Management L.P.	105,446105,446	$2M	0.09%	NEW
85	CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	105,245105,245	$2M	0.08%	—
86	WATER ISLAND CAPITAL LLC	103,467103,467	$2M	0.08%	NEW
87	OCCUDO QUANTITATIVE STRATEGIES LP	102,636102,636	$2M	0.08%	NEW
88	OP Asset Management Ltd	101,953101,953	$2M	0.08%	NEW
89	NEW YORK STATE COMMON RETIREMENT FUND	99,37799,377	$2M	0.08%	—
90	DEUTSCHE BANK AG\	98,88398,883	$2M	0.08%	ADD 12%
91	CANADA LIFE ASSURANCE Co	91,89691,896	$1M	0.07%	TRIM -5%
92	FRANKLIN RESOURCES INC	85,24985,249	$1M	0.07%	TRIM -41%
93	Brevan Howard Capital Management LP	82,02782,027	$1M	0.07%	ADD 104%
94	COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS	77,25177,251	$1M	0.06%	ADD 183%
95	Thrivent Financial for Lutherans	73,75373,753	$1M	0.06%	TRIM -3%
96	Voleon Capital Management LP	69,81269,812	$1M	0.06%	TRIM -53%
97	Blackstone Inc.	65,82565,825	$1M	0.05%	NEW
98	Jump Financial, LLC	65,49065,490	$1M	0.05%	ADD 3%
99	Engineers Gate Manager LP	63,53963,539	$1M	0.05%	ADD 239%
100	Schonfeld Strategic Advisors LLC	63,11063,110	$1M	0.05%	TRIM -66%

† 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.

20.0M

20.1M

19.5M

19.1M

18.7M

17.3M

$281M

VANGUARD PORTFOLIO MANAGEMENT LLC

—

6.7M

$110M

DIMENSIONAL FUND ADVISORS LP

4.4M

4.2M

5.0M

5.2M

5.3M

5.5M

$90M

FIL Ltd

—

5.0M

$81M

VANGUARD CAPITAL MANAGEMENT LLC

—

4.8M

$79M

STATE STREET CORP

4.3M

4.2M

4.3M

4.4M

4.3M

$70M

GEODE CAPITAL MANAGEMENT, LLC

2.4M

3.0M

3.1M

2.7M

$43M

HSBC HOLDINGS PLC

92K

94K

82K

28K

59K

2.2M

$37M

GOLDMAN SACHS GROUP INC

582K

729K

478K

759K

497K

2.1M

$34M

T. Rowe Price Investment Management, Inc.

4.4M

4.0M

3.6M

2.9M

3.9M

2.0M

$33M

SOROS FUND MANAGEMENT LLC

—

1.8M

$30M

AQR Arbitrage LLC

—

1.8M

$29M

CHARLES SCHWAB INVESTMENT MANAGEMENT INC

1.7M

1.6M

1.7M

$28M

Qube Research & Technologies Ltd

162K

44K

—

576K

185K

1.5M

$24M

NEXPOINT ASSET MANAGEMENT, L.P.

—

1.5M

$24M

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	276	97,775,393	78.8%	$1.5B
2025-Q4

Short interest has its own tab now — open SI →

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

Activists — 13D, active intent

ORTENZIO ROBERT A0%EXITEDSCHEDULE 13D/A · Amd 3 · event 2026-07-01SEC →

0 shares · 3 reporting persons

Large holders — 13G, passive (top 5 of 6 by % of class)

Holder	% of class	Type	As of
BlackRock, Inc.	12.4%	QII	2025-03-31	SEC →
VANGUARD PORTFOLIO MANAGEMENT LLC	5.45%	QII	2026-03-31	SEC →

SEM US Equity☆

Institutional ownership· 13F filers holding SEM · 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 · SEM

Institutional ownership· 13F filers holding SEM · 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 · SEM

SEM US Equity