OSUR US Equity

ORASURE TECHNOLOGIES INC

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Health Care · Surgical & Medical Instruments & Apparatus · CIK 1116463 · FYE 1231

$4.02

+0.06 (+1.52%)

USD · as of 2026-07-28 · marketstack

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

141 holders

% of shares outstanding held

82.4%

Shares held (13F)

56,719,279

Reporting holders

141

Top holders

largest 100 of 141 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	BlackRock, Inc.	6,516,2166.5M	$20M	9.46%	—
2	PRIVATE MANAGEMENT GROUP INC	5,422,1295.4M	$16M	7.88%	—
3	NEUBERGER BERMAN GROUP LLC	4,361,9014.4M	$13M	6.34%	ADD 9%
4	VANGUARD CAPITAL MANAGEMENT LLC	3,030,8883.0M	$9M	4.40%	NEW†
5	DIMENSIONAL FUND ADVISORS LP	2,820,8302.8M	$8M	4.10%	TRIM -13%
6	SYSTEMATIC FINANCIAL MANAGEMENT LP	2,480,4832.5M	$7M	3.60%	—
7	RENAISSANCE TECHNOLOGIES LLC	2,083,3032.1M	$6M	3.03%	TRIM -3%
8	ACADIAN ASSET MANAGEMENT LLC	2,022,1192.0M	$6M	2.94%	—
9	CANNELL CAPITAL LLC	2,003,2712.0M	$6M	2.91%	ADD 3%
10	GEODE CAPITAL MANAGEMENT, LLC	1,820,0191.8M	$5M	2.64%	ADD 4%
11	GAGNON SECURITIES LLC	1,714,3911.7M	$5M	2.49%	ADD 9%
12	STATE STREET CORP	1,704,7801.7M	$5M	2.48%	ADD 6%
13	D. E. Shaw & Co., Inc.	1,382,3881.4M	$4M	2.01%	TRIM -17%
14	Gagnon Advisors, LLC	1,207,4401.2M	$4M	1.75%	—
15	Peapod Lane Capital LLC	1,018,4761.0M	$3M	1.48%	—
16	JACOBS LEVY EQUITY MANAGEMENT, INC	999,593999,593	$3M	1.45%	—
17	WELLS FARGO & COMPANY/MN	899,841899,841	$3M	1.31%	ADD 3%
18	Archon Capital Management LLC	747,909747,909	$2M	1.09%	ADD 30%
19	Yorkville Advisors Global, LP	635,000635,000	$2M	0.92%	NEW
20	NORTHERN TRUST CORP	595,172595,172	$2M	0.86%	ADD 3%
21	VANGUARD PORTFOLIO MANAGEMENT LLC	590,198590,198	$2M	0.86%	NEW
22	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	585,837585,837	$2M	0.85%	TRIM -6%
23	VANGUARD FIDUCIARY TRUST CO	454,775454,775	$1M	0.66%	NEW
24	SEI INVESTMENTS CO	417,958417,958	$1M	0.61%	ADD 127%
25	GOLDMAN SACHS GROUP INC	411,526411,526	$1M	0.60%	ADD 30%
26	MORGAN STANLEY	373,947373,947	$1M	0.54%	TRIM -29%
27	KLP KAPITALFORVALTNING AS	363,300363,300	$1M	0.53%	—
28	JPMORGAN CHASE & CO	360,524360,524	$1M	0.52%	TRIM -9%
29	INTRINSIC EDGE CAPITAL MANAGEMENT LLC	349,064349,064	$1M	0.51%	—
30	AQR CAPITAL MANAGEMENT LLC	330,901330,901	$992,703	0.48%	ADD 49%
31	Orion Porfolio Solutions, LLC	324,517324,517	$973,551	0.47%	ADD 11%
32	GSA CAPITAL PARTNERS LLP	288,621288,621	$866,000	0.42%	ADD 91%
33	BRIDGEWAY CAPITAL MANAGEMENT, LLC	284,563284,563	$853,689	0.41%	TRIM -35%
34	UBS Group AG	243,294243,294	$729,882	0.35%	TRIM -64%
35	AMERIPRISE FINANCIAL INC	218,233218,233	$654,699	0.32%	TRIM -17%
36	Bank of New York Mellon Corp	200,377200,377	$601,131	0.29%	TRIM -6%
37	AMERICAN CENTURY COMPANIES INC	199,924199,924	$599,772	0.29%	—
38	PRICE T ROWE ASSOCIATES INC /MD/	195,769195,769	$588,000	0.28%	ADD 7%
39	Invesco Ltd.	165,003165,003	$495,009	0.24%	ADD 2%
40	Nuveen, LLC	159,359159,359	$478,077	0.23%	—
41	SUSQUEHANNA INTERNATIONAL GROUP, LLP	153,610153,610	$460,830	0.22%	ADD 426%
42	HSBC HOLDINGS PLC	141,309141,309	$421,101	0.21%	TRIM -48%
43	STRS OHIO	137,000137,000	$411,000	0.20%	TRIM -9%
44	BANK OF AMERICA CORP /DE/	134,406134,406	$403,218	0.20%	—
45	Odyssean, LLC	133,937133,937	$401,811	0.19%	ADD 100%
46	JANE STREET GROUP, LLC	125,516125,516	$376,548	0.18%	TRIM -65%
47	SIMPLEX TRADING, LLC	118,051118,051	$354,153	0.17%	ADD 4833%
48	Murphy Pohlad Asset Management LLC	115,867115,867	$347,601	0.17%	—
49	XTX Topco Ltd	115,714115,714	$347,142	0.17%	TRIM -4%
50	BARCLAYS PLC	115,172115,172	$345,516	0.17%	TRIM -45%
51	DEUTSCHE BANK AG\	114,592114,592	$343,776	0.17%	ADD 22%
52	TUDOR INVESTMENT CORP ET AL	112,756112,756	$338,268	0.16%	TRIM -40%
53	ALLIANCEBERNSTEIN L.P.	124,816124,816	$302,055	0.18%	TRIM -4%
54	FULLER & THALER ASSET MANAGEMENT, INC.	99,24499,244	$297,732	0.14%	NEW
55	PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO	93,37993,379	$280,137	0.14%	—
56	RHUMBLINE ADVISERS	84,95784,957	$254,871	0.12%	TRIM -6%
57	Russell Investments Group, Ltd.	83,69783,697	$251,094	0.12%	ADD 92%
58	HighTower Advisors, LLC	63,26463,264	$189,792	0.09%	ADD 214%
59	TWO SIGMA INVESTMENTS, LP	56,10056,100	$168,300	0.08%	NEW
60	Nierenberg Investment Management Company, LLC	55,55555,555	$166,665	0.08%	ADD 25%
61	CITADEL ADVISORS LLC	55,30655,306	$165,918	0.08%	TRIM -86%
62	Empowered Funds, LLC	49,63149,631	$148,893	0.07%	—
63	BFSG, LLC	44,35044,350	$133,050	0.06%	—
64	MetLife Investment Management, LLC	38,23938,239	$114,717	0.06%	ADD 194%
65	Metis Global Partners, LLC	34,43034,430	$103,290	0.05%	TRIM -40%
66	STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM	34,33834,338	$103,014	0.05%	—
67	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	33,69833,698	$101,094	0.05%	ADD 2%
68	Manatuck Hill Partners, LLC	30,00030,000	$90,000	0.04%	—
69	Vanguard Global Advisers, LLC	25,57525,575	$76,725	0.04%	NEW
70	Graham Capital Management, L.P.	25,49825,498	$76,494	0.04%	—
71	SHIKIAR ASSET MANAGEMENT INC	25,00025,000	$75,000	0.04%	—
72	IMC-Chicago, LLC	23,51723,517	$70,551	0.03%	NEW
73	Aster Capital Management (DIFC) Ltd	20,08020,080	$67,670	0.03%	NEW
74	MANUFACTURERS LIFE INSURANCE COMPANY, THE	21,12521,125	$63,375	0.03%	TRIM -23%
75	Quadrant Private Wealth Management, LLC	20,26020,260	$60,780	0.03%	—
76	OneDigital Investment Advisors LLC	20,01120,011	$60,033	0.03%	ADD 19%
77	LPL Financial LLC	19,96619,966	$59,898	0.03%	ADD 2%
78	Significant Wealth Partners LLC	19,85719,857	$59,571	0.03%	ADD 2%
79	NEW YORK STATE COMMON RETIREMENT FUND	19,30719,307	$57,921	0.03%	—
80	BNP PARIBAS FINANCIAL MARKETS	19,25119,251	$57,753	0.03%	TRIM -2%
81	L2 Asset Management, LLC	19,00219,002	$57,006	0.03%	ADD 4%
82	MILLENNIUM MANAGEMENT LLC	18,95818,958	$56,874	0.03%	TRIM -98%
83	INTECH INVESTMENT MANAGEMENT LLC	18,85318,853	$56,559	0.03%	TRIM -39%
84	Vanguard Personalized Indexing Management, LLC	16,77516,775	$50,325	0.02%	NEW
85	PUBLIC EMPLOYEES RETIREMENT ASSOCIATION OF COLORADO	16,47616,476	$49,000	0.02%	—
86	NewEdge Advisors, LLC	47,75447,754	$47,754	0.07%	—
87	Squarepoint Ops LLC	15,19915,199	$45,597	0.02%	ADD 12%
88	Moors & Cabot, Inc.	14,75514,755	$44,265	0.02%	—
89	CITIGROUP INC	14,43514,435	$43,305	0.02%	ADD 799%
90	VOYA INVESTMENT MANAGEMENT LLC	14,26414,264	$42,792	0.02%	TRIM -7%
91	Police & Firemen's Retirement System of New Jersey	13,35913,359	$40,077	0.02%	—
92	Grantham, Mayo, Van Otterloo & Co. LLC	12,33112,331	$36,993	0.02%	—
93	DIVERSIFY WEALTH MANAGEMENT, LLC	12,18712,187	$36,074	0.02%	NEW
94	OSAIC HOLDINGS, INC.	11,74811,748	$35,244	0.02%	ADD 4%
95	PRUDENTIAL FINANCIAL INC	11,67711,677	$35,031	0.02%	NEW
96	CANANDAIGUA NATIONAL CORP	11,59911,599	$34,797	0.02%	NEW
97	Tower Research Capital LLC (TRC)	11,49911,499	$34,497	0.02%	ADD 80%
98	FMR LLC	10,39310,393	$31,179	0.02%	TRIM -5%
99	PNC FINANCIAL SERVICES GROUP, INC.	10,11410,114	$30,342	0.01%	TRIM -18%
100	ProShare Advisors LLC	10,09010,090	$30,270	0.01%	TRIM -22%

† 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.

7.0M

6.9M

6.6M

6.7M

6.4M

6.5M

$20M

PRIVATE MANAGEMENT GROUP INC

—

4.4M

5.5M

5.4M

$16M

NEUBERGER BERMAN GROUP LLC

3.6M

4.3M

4.2M

4.0M

4.4M

$13M

VANGUARD CAPITAL MANAGEMENT LLC

—

3.0M

$9M

DIMENSIONAL FUND ADVISORS LP

4.0M

3.8M

3.6M

3.3M

2.8M

$8M

SYSTEMATIC FINANCIAL MANAGEMENT LP

1.7M

1.6M

2.2M

2.5M

$7M

RENAISSANCE TECHNOLOGIES LLC

2.8M

2.6M

2.3M

2.1M

$6M

ACADIAN ASSET MANAGEMENT LLC

2.9M

2.8M

2.2M

2.1M

2.0M

$6M

CANNELL CAPITAL LLC

1.5M

1.4M

1.9M

2.1M

2.0M

$6M

GEODE CAPITAL MANAGEMENT, LLC

1.8M

1.9M

1.8M

$5M

GAGNON SECURITIES LLC

—

1.1M

1.6M

1.7M

$5M

STATE STREET CORP

1.6M

1.5M

1.6M

1.7M

$5M

D. E. Shaw & Co., Inc.

1.5M

1.7M

1.4M

$4M

Gagnon Advisors, LLC

—

797K

1.2M

$4M

Peapod Lane Capital LLC

479K

571K

667K

674K

1.0M

$3M

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	141	56,719,279	82.4%	$159M
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 · OSUR

Activists — 13D, active intent

Altai Capital Management, L.P.5.2%no changeSCHEDULE 13D/A · Amd 4 · event 2026-04-16SEC →

3,613,836 shares · 3 reporting persons

“Item 4 is hereby amended and supplemented as follows: On April 16, 2026, Investment Manager and IMGP entered into a cooperation agreement with the Issuer (the "Cooperation Agreement"), pursuant to which the Issuer agreed, among other things, to take all necessary actions to appoint John Bertrand to the Board for a term expiring at the Issuer's 2026 Annual Meeting of Stockholders (the "2026 Annual Meeting"), and to nominate and recommend in favor of Mr. Bertrand's election to the Board at the 202”

Large holders — 13G, passive (top 5 of 9 by % of class)

Holder	% of class	Type	As of
PRIVATE MANAGEMENT GROUP INC	7.3%	QII	2025-06-30	SEC →
BlackRock, Inc.	7.2%	QII	2025-03-31	SEC →

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

141 holders

% of shares outstanding held

82.4%

Shares held (13F)

56,719,279

Reporting holders

141

Top holders

largest 100 of 141 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	BlackRock, Inc.	6,516,2166.5M	$20M	9.46%	—
2	PRIVATE MANAGEMENT GROUP INC	5,422,1295.4M	$16M	7.88%	—
3	NEUBERGER BERMAN GROUP LLC	4,361,9014.4M	$13M	6.34%	ADD 9%
4	VANGUARD CAPITAL MANAGEMENT LLC	3,030,8883.0M	$9M	4.40%	NEW†
5	DIMENSIONAL FUND ADVISORS LP	2,820,8302.8M	$8M	4.10%	TRIM -13%
6	SYSTEMATIC FINANCIAL MANAGEMENT LP	2,480,4832.5M	$7M	3.60%	—
7	RENAISSANCE TECHNOLOGIES LLC	2,083,3032.1M	$6M	3.03%	TRIM -3%
8	ACADIAN ASSET MANAGEMENT LLC	2,022,1192.0M	$6M	2.94%	—
9	CANNELL CAPITAL LLC	2,003,2712.0M	$6M	2.91%	ADD 3%
10	GEODE CAPITAL MANAGEMENT, LLC	1,820,0191.8M	$5M	2.64%	ADD 4%
11	GAGNON SECURITIES LLC	1,714,3911.7M	$5M	2.49%	ADD 9%
12	STATE STREET CORP	1,704,7801.7M	$5M	2.48%	ADD 6%
13	D. E. Shaw & Co., Inc.	1,382,3881.4M	$4M	2.01%	TRIM -17%
14	Gagnon Advisors, LLC	1,207,4401.2M	$4M	1.75%	—
15	Peapod Lane Capital LLC	1,018,4761.0M	$3M	1.48%	—
16	JACOBS LEVY EQUITY MANAGEMENT, INC	999,593999,593	$3M	1.45%	—
17	WELLS FARGO & COMPANY/MN	899,841899,841	$3M	1.31%	ADD 3%
18	Archon Capital Management LLC	747,909747,909	$2M	1.09%	ADD 30%
19	Yorkville Advisors Global, LP	635,000635,000	$2M	0.92%	NEW
20	NORTHERN TRUST CORP	595,172595,172	$2M	0.86%	ADD 3%
21	VANGUARD PORTFOLIO MANAGEMENT LLC	590,198590,198	$2M	0.86%	NEW
22	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	585,837585,837	$2M	0.85%	TRIM -6%
23	VANGUARD FIDUCIARY TRUST CO	454,775454,775	$1M	0.66%	NEW
24	SEI INVESTMENTS CO	417,958417,958	$1M	0.61%	ADD 127%
25	GOLDMAN SACHS GROUP INC	411,526411,526	$1M	0.60%	ADD 30%
26	MORGAN STANLEY	373,947373,947	$1M	0.54%	TRIM -29%
27	KLP KAPITALFORVALTNING AS	363,300363,300	$1M	0.53%	—
28	JPMORGAN CHASE & CO	360,524360,524	$1M	0.52%	TRIM -9%
29	INTRINSIC EDGE CAPITAL MANAGEMENT LLC	349,064349,064	$1M	0.51%	—
30	AQR CAPITAL MANAGEMENT LLC	330,901330,901	$992,703	0.48%	ADD 49%
31	Orion Porfolio Solutions, LLC	324,517324,517	$973,551	0.47%	ADD 11%
32	GSA CAPITAL PARTNERS LLP	288,621288,621	$866,000	0.42%	ADD 91%
33	BRIDGEWAY CAPITAL MANAGEMENT, LLC	284,563284,563	$853,689	0.41%	TRIM -35%
34	UBS Group AG	243,294243,294	$729,882	0.35%	TRIM -64%
35	AMERIPRISE FINANCIAL INC	218,233218,233	$654,699	0.32%	TRIM -17%
36	Bank of New York Mellon Corp	200,377200,377	$601,131	0.29%	TRIM -6%
37	AMERICAN CENTURY COMPANIES INC	199,924199,924	$599,772	0.29%	—
38	PRICE T ROWE ASSOCIATES INC /MD/	195,769195,769	$588,000	0.28%	ADD 7%
39	Invesco Ltd.	165,003165,003	$495,009	0.24%	ADD 2%
40	Nuveen, LLC	159,359159,359	$478,077	0.23%	—
41	SUSQUEHANNA INTERNATIONAL GROUP, LLP	153,610153,610	$460,830	0.22%	ADD 426%
42	HSBC HOLDINGS PLC	141,309141,309	$421,101	0.21%	TRIM -48%
43	STRS OHIO	137,000137,000	$411,000	0.20%	TRIM -9%
44	BANK OF AMERICA CORP /DE/	134,406134,406	$403,218	0.20%	—
45	Odyssean, LLC	133,937133,937	$401,811	0.19%	ADD 100%
46	JANE STREET GROUP, LLC	125,516125,516	$376,548	0.18%	TRIM -65%
47	SIMPLEX TRADING, LLC	118,051118,051	$354,153	0.17%	ADD 4833%
48	Murphy Pohlad Asset Management LLC	115,867115,867	$347,601	0.17%	—
49	XTX Topco Ltd	115,714115,714	$347,142	0.17%	TRIM -4%
50	BARCLAYS PLC	115,172115,172	$345,516	0.17%	TRIM -45%
51	DEUTSCHE BANK AG\	114,592114,592	$343,776	0.17%	ADD 22%
52	TUDOR INVESTMENT CORP ET AL	112,756112,756	$338,268	0.16%	TRIM -40%
53	ALLIANCEBERNSTEIN L.P.	124,816124,816	$302,055	0.18%	TRIM -4%
54	FULLER & THALER ASSET MANAGEMENT, INC.	99,24499,244	$297,732	0.14%	NEW
55	PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO	93,37993,379	$280,137	0.14%	—
56	RHUMBLINE ADVISERS	84,95784,957	$254,871	0.12%	TRIM -6%
57	Russell Investments Group, Ltd.	83,69783,697	$251,094	0.12%	ADD 92%
58	HighTower Advisors, LLC	63,26463,264	$189,792	0.09%	ADD 214%
59	TWO SIGMA INVESTMENTS, LP	56,10056,100	$168,300	0.08%	NEW
60	Nierenberg Investment Management Company, LLC	55,55555,555	$166,665	0.08%	ADD 25%
61	CITADEL ADVISORS LLC	55,30655,306	$165,918	0.08%	TRIM -86%
62	Empowered Funds, LLC	49,63149,631	$148,893	0.07%	—
63	BFSG, LLC	44,35044,350	$133,050	0.06%	—
64	MetLife Investment Management, LLC	38,23938,239	$114,717	0.06%	ADD 194%
65	Metis Global Partners, LLC	34,43034,430	$103,290	0.05%	TRIM -40%
66	STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM	34,33834,338	$103,014	0.05%	—
67	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	33,69833,698	$101,094	0.05%	ADD 2%
68	Manatuck Hill Partners, LLC	30,00030,000	$90,000	0.04%	—
69	Vanguard Global Advisers, LLC	25,57525,575	$76,725	0.04%	NEW
70	Graham Capital Management, L.P.	25,49825,498	$76,494	0.04%	—
71	SHIKIAR ASSET MANAGEMENT INC	25,00025,000	$75,000	0.04%	—
72	IMC-Chicago, LLC	23,51723,517	$70,551	0.03%	NEW
73	Aster Capital Management (DIFC) Ltd	20,08020,080	$67,670	0.03%	NEW
74	MANUFACTURERS LIFE INSURANCE COMPANY, THE	21,12521,125	$63,375	0.03%	TRIM -23%
75	Quadrant Private Wealth Management, LLC	20,26020,260	$60,780	0.03%	—
76	OneDigital Investment Advisors LLC	20,01120,011	$60,033	0.03%	ADD 19%
77	LPL Financial LLC	19,96619,966	$59,898	0.03%	ADD 2%
78	Significant Wealth Partners LLC	19,85719,857	$59,571	0.03%	ADD 2%
79	NEW YORK STATE COMMON RETIREMENT FUND	19,30719,307	$57,921	0.03%	—
80	BNP PARIBAS FINANCIAL MARKETS	19,25119,251	$57,753	0.03%	TRIM -2%
81	L2 Asset Management, LLC	19,00219,002	$57,006	0.03%	ADD 4%
82	MILLENNIUM MANAGEMENT LLC	18,95818,958	$56,874	0.03%	TRIM -98%
83	INTECH INVESTMENT MANAGEMENT LLC	18,85318,853	$56,559	0.03%	TRIM -39%
84	Vanguard Personalized Indexing Management, LLC	16,77516,775	$50,325	0.02%	NEW
85	PUBLIC EMPLOYEES RETIREMENT ASSOCIATION OF COLORADO	16,47616,476	$49,000	0.02%	—
86	NewEdge Advisors, LLC	47,75447,754	$47,754	0.07%	—
87	Squarepoint Ops LLC	15,19915,199	$45,597	0.02%	ADD 12%
88	Moors & Cabot, Inc.	14,75514,755	$44,265	0.02%	—
89	CITIGROUP INC	14,43514,435	$43,305	0.02%	ADD 799%
90	VOYA INVESTMENT MANAGEMENT LLC	14,26414,264	$42,792	0.02%	TRIM -7%
91	Police & Firemen's Retirement System of New Jersey	13,35913,359	$40,077	0.02%	—
92	Grantham, Mayo, Van Otterloo & Co. LLC	12,33112,331	$36,993	0.02%	—
93	DIVERSIFY WEALTH MANAGEMENT, LLC	12,18712,187	$36,074	0.02%	NEW
94	OSAIC HOLDINGS, INC.	11,74811,748	$35,244	0.02%	ADD 4%
95	PRUDENTIAL FINANCIAL INC	11,67711,677	$35,031	0.02%	NEW
96	CANANDAIGUA NATIONAL CORP	11,59911,599	$34,797	0.02%	NEW
97	Tower Research Capital LLC (TRC)	11,49911,499	$34,497	0.02%	ADD 80%
98	FMR LLC	10,39310,393	$31,179	0.02%	TRIM -5%
99	PNC FINANCIAL SERVICES GROUP, INC.	10,11410,114	$30,342	0.01%	TRIM -18%
100	ProShare Advisors LLC	10,09010,090	$30,270	0.01%	TRIM -22%

† 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.

7.0M

6.9M

6.6M

6.7M

6.4M

6.5M

$20M

PRIVATE MANAGEMENT GROUP INC

—

4.4M

5.5M

5.4M

$16M

NEUBERGER BERMAN GROUP LLC

3.6M

4.3M

4.2M

4.0M

4.4M

$13M

VANGUARD CAPITAL MANAGEMENT LLC

—

3.0M

$9M

DIMENSIONAL FUND ADVISORS LP

4.0M

3.8M

3.6M

3.3M

2.8M

$8M

SYSTEMATIC FINANCIAL MANAGEMENT LP

1.7M

1.6M

2.2M

2.5M

$7M

RENAISSANCE TECHNOLOGIES LLC

2.8M

2.6M

2.3M

2.1M

$6M

ACADIAN ASSET MANAGEMENT LLC

2.9M

2.8M

2.2M

2.1M

2.0M

$6M

CANNELL CAPITAL LLC

1.5M

1.4M

1.9M

2.1M

2.0M

$6M

GEODE CAPITAL MANAGEMENT, LLC

1.8M

1.9M

1.8M

$5M

GAGNON SECURITIES LLC

—

1.1M

1.6M

1.7M

$5M

STATE STREET CORP

1.6M

1.5M

1.6M

1.7M

$5M

D. E. Shaw & Co., Inc.

1.5M

1.7M

1.4M

$4M

Gagnon Advisors, LLC

—

797K

1.2M

$4M

Peapod Lane Capital LLC

479K

571K

667K

674K

1.0M

$3M

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	141	56,719,279	82.4%	$159M
2025-Q4

Short interest has its own tab now — open SI →

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

Activists — 13D, active intent

Altai Capital Management, L.P.5.2%no changeSCHEDULE 13D/A · Amd 4 · event 2026-04-16SEC →

3,613,836 shares · 3 reporting persons

Large holders — 13G, passive (top 5 of 9 by % of class)

Holder	% of class	Type	As of
PRIVATE MANAGEMENT GROUP INC	7.3%	QII	2025-06-30	SEC →
BlackRock, Inc.	7.2%	QII	2025-03-31	SEC →

OSUR US Equity☆

Institutional ownership· 13F filers holding OSUR · 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 · OSUR

Institutional ownership· 13F filers holding OSUR · 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 · OSUR

OSUR US Equity