Stocks › QDEL

QuidelOrtho QDEL

US equityMarket cap rank #3366

$12.25 −$0.06 (-0.49%)

Market open · Oct 8, 11:40 am ET · After hours $12.51 +1.62%

Open$12.26

Prev close$12.31

Day range$11.72 – $12.32

Volume428.7K

Market cap$840.05M

P/E (TTM)–

Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership121.8%-0.50 pts vs. prior quarter

Institutions holding286+0 vs. prior quarter

Insider trades (recent)43 buys / 7 sellsNet buying

Short interest20.69% of floatDays to cover 10.8 · as of 15 Sep 2026

Short-sale volume share16.3%5-day average of daily volume

Short-sale volume as % of daily volume

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$6.52M (5 inflow days, 15 outflow days).

Net flow by order size, last 20 sessions

Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.

The five largest holders on file together own 47.9% of shares outstanding.

Largest holders

BlackRock16.34%
FMR10.73%
Newtyn Management, LLC9.66%
Vanguard Portfolio Management, LLC6.03%
Vanguard Capital Management, LLC5.14%
Neuberger Berman Investment Advisers LLC4.93%
American Century Investment Management4.82%
Rubric Capital Management LP4.82%

By investor type

Mutual Fund94.29%
Hedge Fund21.54%
Public Company3.51%
Individual/Insider1.12%
Government Pension Fund0.97%
Private Company0.84%
Insurance Company0.34%
Family Office/Trust0.22%

Reported short interest has risen from 16.87% to 20.69% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Recent institutional activity

Holder	Type	Period	Share change	New stake
Nuveen Asset Management LLC	Insurance Company	2026/Q3	+184,116	0.3%
Newtyn Management, LLC	Hedge Fund	2026/Q3	+2,066,528	9.7%
Paradigm Capital Management, Inc.	Mutual Fund	2026/Q3	+995,800	3.7%
Buckley Capital Advisors, LLC	Hedge Fund	2026/Q3	+850,335	1.2%
FMR	Mutual Fund	2026/Q3	+770,795	10.7%
BlackRock	Mutual Fund	2026/Q3	+753,396	16.3%
AQR Capital Management	Hedge Fund	2026/Q3	+720,763	1.3%
Private Management Group Inc	Mutual Fund	2026/Q3	+685,622	3.0%
Van Lanschot Kempen Investment Management N.V.	Mutual Fund	2026/Q3	+647,069	0.9%
Gagnon Securities, LLC	Mutual Fund	2026/Q3	+627,046	1.5%
American Century Investment Management	Mutual Fund	2026/Q3	+450,947	4.8%
Millennium Management LLC	Hedge Fund	2026/Q3	+440,263	1.1%
Eaton Vance Management	Mutual Fund	2026/Q3	+344,141	0.7%
Morgan Stanley	Public Company	2026/Q3	+307,874	1.7%
Gem Investment Advisors, LLC	Mutual Fund	2026/Q3	+269,333	0.8%

Institutional buy/sell activity by reporting period, largest moves first.

Insider transactions

Date	Insider	Title	Transaction	Shares	Price	Held after
14 Sep 2026	Ronald Bowman	Chief Human Resources Officer	Derivative Exercise and Sale	-921	$10.63	5,020
14 Sep 2026	Ronald Bowman	Chief Human Resources Officer	Derivative Exercise and Retained	+1,645	–	5,020
14 Aug 2026	Bryan Hanson	Senior Vice President of Clinical Labs & Transfusion Medicine	Derivative Exercise and Sale	-162	$14.30	8,055
14 Aug 2026	Bryan Hanson	Senior Vice President of Clinical Labs & Transfusion Medicine	Derivative Exercise and Retained	+284	–	8,055
14 Jul 2026	Micah Young	Chief Financial Officer & Principal Financial Officer	Other Derivative Acquisition	+356,555	–	356,555
30 Jun 2026	Bryan Hanson	Senior Vice President of Clinical Labs & Transfusion Medicine	Derivative Exercise and Sale	-2,096	$18.18	7,771
30 Jun 2026	Bryan Hanson	Senior Vice President of Clinical Labs & Transfusion Medicine	Derivative Exercise and Retained	+3,701	–	7,771
24 Jun 2026	Ann Rhoads	Independent Director	Other Derivative Acquisition	+369	–	369
24 Jun 2026	Ann Rhoads	Independent Director	Other Derivative Acquisition	+3,698	–	3,698
24 Jun 2026	Ann Rhoads	Independent Director	Other Derivative Acquisition	+15,532	–	15,532
24 Jun 2026	Kenneth Widder	Independent Director	Other Derivative Acquisition	+1,997	–	1,997
24 Jun 2026	Kenneth Widder	Independent Director	Other Derivative Acquisition	+6,656	–	6,656
24 Jun 2026	Kenneth Widder	Independent Director	Other Derivative Acquisition	+15,532	–	15,532
24 Jun 2026	Kenneth Buechler	Independent Non-Executive Chairperson	Other Derivative Acquisition	+3,661	–	3,661
24 Jun 2026	Kenneth Buechler	Independent Non-Executive Chairperson	Other Derivative Acquisition	+12,204	–	12,204
24 Jun 2026	Kenneth Buechler	Independent Non-Executive Chairperson	Other Derivative Acquisition	+15,532	–	15,532
24 Jun 2026	Edward Michael	Independent Director	Other Derivative Acquisition	+1,053	–	1,053
24 Jun 2026	Edward Michael	Independent Director	Other Derivative Acquisition	+3,513	–	3,513
24 Jun 2026	Edward Michael	Independent Director	Other Derivative Acquisition	+15,532	–	15,532
24 Jun 2026	Mary Polan	Independent Director	Other Derivative Acquisition	+1,664	–	1,664

From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.

Short interest, by report

Report date	Shares short	% of float	Days to cover
15 Sep 2026	14,190,525	20.7%	10.8
31 Aug 2026	14,128,210	20.6%	10.5
14 Aug 2026	14,962,267	21.8%	7.6
31 Jul 2026	13,005,131	19.1%	12.7
15 Jul 2026	11,802,749	17.3%	9.8
30 Jun 2026	11,505,504	16.9%	5.4

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