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 PTX'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 PTX's days to cover?

1.00 days for settlement date 28 Feb 2019: 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.

How shorted was Pernix Therapeutics Holdings,? PTX

Pernix Therapeutics Holdings, left the US market in 2019. This page is a frozen archive of its reported short interest, ending 28 Feb 2019. The ticker PTX no longer refers to this company and may since have been reassigned.

18.77%

of shares outstanding reported short · settlement date 28 Feb 2019

vs previous report: +0.65
5 reports (~10 weeks): +2.33
days to cover: 1.00

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.

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 filed	Settlement before	Settlement after	Change
13 Nov 2018	16.36% 31 Oct 2018	15.46% 15 Nov 2018	−0.90
9 Aug 2018	17.41% 31 Jul 2018	15.71% 15 Aug 2018	−1.70
10 May 2018	19.24% 30 Apr 2018	18.72% 15 May 2018	−0.52
8 Mar 2018	20.28% 28 Feb 2018	19.31% 15 Mar 2018	−0.97

Embed this chart

Paste this snippet to embed the interactive chart. It updates with each FINRA report and keeps the source attribution. Preview

<iframe src="https://howshorted.com/embed/us/ptx-2021/" width="100%" height="430" style="border:0" loading="lazy" title="Pernix Therapeutics Holdings, short interest chart"></iframe>
<p>Source: FINRA data compiled by <a href="https://howshorted.com/us/company/ptx-2021/">howshorted.com</a></p>

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Plain

Short position data for Pernix Therapeutics Holdings,: FINRA, compiled by howshorted.com, settlement date 28 Feb 2019. https://howshorted.com/us/company/ptx-2021/

Wikipedia

<ref>{{cite web |title=Pernix Therapeutics Holdings, short position data |url=https://howshorted.com/us/company/ptx-2021/ |website=HowShorted |publisher=howshorted.com (data: FINRA) |date=2019-02-28 |access-date=2026-10-13}}</ref>

BibTeX

@misc{howshorted-pernix-therapeutics-holdings-2019-02-28,
  title        = {Pernix Therapeutics Holdings, short position data},
  author       = {{HowShorted}},
  howpublished = {\url{https://howshorted.com/us/company/ptx-2021/}},
  note         = {Data: FINRA, settlement date 28 Feb 2019; accessed 2026-10-13},
  year         = {2019}
}

Sector: Healthcare · By year: 2018

History

Full reported short interest history
Settlement date	Short %	Change
28 Feb 2019	18.77%	+0.65
15 Feb 2019	18.12%	+3.89
31 Jan 2019	14.23%	+0.43
15 Jan 2019	13.80%	−2.66
31 Dec 2018	16.46%	+0.02
14 Dec 2018	16.44%	+1.71
30 Nov 2018	14.73%	−0.73
15 Nov 2018	15.46%	−0.90
31 Oct 2018	16.36%	−0.33
15 Oct 2018	16.69%	+0.49
28 Sep 2018	16.20%	+0.35
14 Sep 2018	15.85%	+0.23
31 Aug 2018	15.62%	−0.09
15 Aug 2018	15.71%	−1.70
31 Jul 2018	17.41%	−0.21
13 Jul 2018	17.62%	−0.22
29 Jun 2018	17.84%	−0.15
15 Jun 2018	17.99%	−0.18
31 May 2018	18.17%	−0.55
15 May 2018	18.72%	−0.52
30 Apr 2018	19.24%	−0.53
13 Apr 2018	19.77%	−0.03
29 Mar 2018	19.80%	+0.49
15 Mar 2018	19.31%	−0.97
28 Feb 2018	20.28%	−0.75
15 Feb 2018	21.03%	+1.81
31 Jan 2018	19.22%	+0.76
12 Jan 2018	18.46%	+0.54
29 Dec 2017	17.92%	–

Newest first. Scroll inside the table for earlier dates, back to 29 Dec 2017.

Frequently asked questions

How shorted was Pernix Therapeutics Holdings,?: Pernix Therapeutics Holdings, left the US market in 2019. Its final reported figure was 18.77% of shares outstanding for settlement date 28 Feb 2019, per FINRA's consolidated short interest report; this page preserves its full history.
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 PTX'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 PTX's days to cover?: 1.00 days for settlement date 28 Feb 2019: 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.