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HowShorted

How shorted is QuidelOrtho Corporation? QDEL

#107most shorted US stockof 3,805 ranked stocks, more shorted than 97%

The ticker QDEL previously referred to QuidelOrtho Corporation (to 2022).

20.69%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.09
5 reports (~10 weeks)
+3.82
days to cover
10.77
Aggregate net short position time series for QuidelOrtho Corporation

Markers along the chart's base: ▲ results announced (an 8-K reporting results was filed) ▲ quarterly or annual report filed. Dates are SEC filing dates; hover a point to see events since the previous settlement.

Days to cover

FINRA's own figure: reported shares short divided by the stock's average daily trading volume, published alongside each settlement. It expresses the short position in days of typical trading rather than as a percentage of the company; the two can move differently.

Aggregate net short position time series for QuidelOrtho Corporation days to cover

Short interest around results

For each results announcement (an 8-K reporting results, by its SEC filing date), the FINRA settlement before it and the first one after. Settlements fall twice a month, so the two figures can sit up to a month apart and much else changes in between: this shows what was reported, not why.

Reported short interest before and after each results announcement
Results filedSettlement beforeSettlement afterChange
6 Aug 202618.96% 31 Jul 202621.82% 14 Aug 2026+2.86
5 May 202618.79% 30 Apr 202617.30% 15 May 2026−1.49
15 Apr 202618.79% 31 Mar 202618.79% 30 Apr 20260.00
11 Feb 202615.27% 30 Jan 202614.96% 13 Feb 2026−0.31
5 Nov 202513.29% 31 Oct 202516.27% 14 Nov 2025+2.98
5 Aug 20259.70% 31 Jul 202510.72% 15 Aug 2025+1.02
7 May 20256.34% 30 Apr 20256.26% 15 May 2025−0.08
12 Feb 20255.07% 31 Jan 20256.47% 14 Feb 2025+1.40

Fails to deliver

The SEC's fails-to-deliver figure for QDEL: the aggregate net balance of shares that failed to be delivered at each settlement date, published by the SEC twice a month and shown here verbatim for the trailing window. A balance is not a daily flow, and a fail has many ordinary causes; the SEC says it cannot guarantee the accuracy of the data. See what fails to deliver are and the largest balances today.

Last balance on file
5
31 Aug 2026
Highest in window
102,112
30 Jun 2026
Days with a balance
85
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for QuidelOrtho Corporation fails to deliver

Source: U.S. Securities and Exchange Commission, fails-to-deliver data (public domain). Only settlement days with a positive balance appear; the largest balance in the window was 102K shares.

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Sector: Healthcare · By year: 2022 · 2023 · 2024 · 2025 · 2026

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202620.69%+0.09
31 Aug 202620.60%−1.22
14 Aug 202621.82%+2.86
31 Jul 202618.96%+1.65
15 Jul 202617.31%+0.44
30 Jun 202616.87%−1.25
15 Jun 202618.12%+0.48
29 May 202617.64%+0.34
15 May 202617.30%−1.49
30 Apr 202618.79%+1.67
15 Apr 202617.12%−1.67
31 Mar 202618.79%+2.64
13 Mar 202616.15%+1.02
27 Feb 202615.13%+0.17
13 Feb 202614.96%−0.31
30 Jan 202615.27%−0.22
15 Jan 202615.49%−1.07
31 Dec 202516.56%−0.12
15 Dec 202516.68%−0.21
28 Nov 202516.89%+0.62
14 Nov 202516.27%+2.98
31 Oct 202513.29%+0.93
15 Oct 202512.36%−0.45
30 Sep 202512.81%+0.80
15 Sep 202512.01%+0.76
29 Aug 202511.25%+0.53
15 Aug 202510.72%+1.02
31 Jul 20259.70%+0.46
15 Jul 20259.24%+0.56
30 Jun 20258.68%+2.67
13 Jun 20256.01%+0.23
30 May 20255.78%−0.48
15 May 20256.26%−0.08
30 Apr 20256.34%+0.69
15 Apr 20255.65%−0.38
31 Mar 20256.03%−0.50
14 Mar 20256.53%+0.19
28 Feb 20256.34%−0.13
14 Feb 20256.47%+1.40
31 Jan 20255.07%−1.08
15 Jan 20256.15%−0.05
31 Dec 20246.20%+0.57
13 Dec 20245.63%−0.19
29 Nov 20245.82%+0.12
15 Nov 20245.70%−0.47
31 Oct 20246.17%−0.13
15 Oct 20246.30%+0.10
30 Sep 20246.20%+0.21
13 Sep 20245.99%−0.34
30 Aug 20246.33%+0.42
15 Aug 20245.91%−0.70
31 Jul 20246.61%+1.02
15 Jul 20245.59%+0.68
28 Jun 20244.91%+0.49
14 Jun 20244.42%+0.07
31 May 20244.35%−0.57
15 May 20244.92%+0.23
30 Apr 20244.69%+0.63
15 Apr 20244.06%+0.69
28 Mar 20243.37%−0.29
15 Mar 20243.66%+0.12
29 Feb 20243.54%−3.06
15 Feb 20246.60%+0.66
31 Jan 20245.94%+0.59
12 Jan 20245.35%−0.55
29 Dec 20235.90%−0.16
15 Dec 20236.06%+0.39
30 Nov 20235.67%+0.63
15 Nov 20235.04%+0.83
31 Oct 20234.21%+0.89
13 Oct 20233.32%+0.03
29 Sep 20233.29%+0.08
15 Sep 20233.21%−0.51
31 Aug 20233.72%−0.23
15 Aug 20233.95%−0.19
31 Jul 20234.14%+0.29
14 Jul 20233.85%−0.27
30 Jun 20234.12%−0.83
15 Jun 20234.95%+0.31
31 May 20234.64%+0.39
15 May 20234.25%+0.07
28 Apr 20234.18%+0.58
14 Apr 20233.60%−0.25
31 Mar 20233.85%−0.08
15 Mar 20233.93%−0.11
28 Feb 20234.04%+0.77
15 Feb 20233.27%−1.02
31 Jan 20234.29%−0.82
13 Jan 20235.11%+0.62
30 Dec 20224.49%+0.36
15 Dec 20224.13%+0.04
30 Nov 20224.09%−0.66
15 Nov 20224.75%−0.02
31 Oct 20224.77%+0.08
14 Oct 20224.69%−0.26
30 Sep 20224.95%+0.17
15 Sep 20224.78%−0.27
31 Aug 20225.05%−1.01
15 Aug 20226.06%+1.42
29 Jul 20224.64%–

Newest first. Scroll inside the table for earlier dates, back to 29 Jul 2022.

Frequently asked questions

How shorted is QuidelOrtho Corporation right now?
20.69% of QuidelOrtho Corporation's (QDEL) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 107th most shorted US stock, out of 3,805 we rank.
What does this number include?
FINRA member firms must report their short positions in all US equities twice a month; FINRA consolidates them per security. We divide that official share count by the company's shares outstanding from its SEC filings. This is the regulatory figure, not a daily estimate.
Why does it only update twice a month?
US short interest is reported for settlement on the 15th and the last business day of each month, and FINRA publishes the consolidated figures about nine business days later. That cadence is set by regulation; no daily official figure exists.
Is this QDEL's short float?
No. This is short interest as a percentage of shares outstanding, the count in the company's SEC filings. "Short float" divides the same FINRA short count by the public float, which excludes closely held shares, so it comes out higher for the same company. We publish no float estimates: the float is not a regulatory figure.
What is QDEL's days to cover?
10.77 days for settlement date 15 Sep 2026: FINRA's own short interest ratio, the reported shares short divided by average daily trading volume. It is published in the same FINRA file and shown verbatim; we hold no volume data ourselves.
Which funds are short?
US public short interest is aggregate-only: individual short sellers are not named. Only some EU markets publish named positions.