How shorted is LB Pharmaceuticals Inc right now?

17.41% of LB Pharmaceuticals Inc's (LBRX) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 197th 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 LBRX'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 LBRX's days to cover?

21.45 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.

How shorted is LB Pharmaceuticals Inc? LBRX

#197most shorted US stockof 3,805 ranked stocks, more shorted than 94%

17.41%

of shares outstanding reported short · settlement date 15 Sep 2026

vs previous report: +1.05
5 reports (~10 weeks): +1.54
days to cover: 21.45

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
11 Aug 2026	16.55% 31 Jul 2026	15.98% 14 Aug 2026	−0.57
12 May 2026	13.25% 30 Apr 2026	14.01% 15 May 2026	+0.76

Fails to deliver

The SEC's fails-to-deliver figure for LBRX: 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: 27,819; 8 Sep 2026
Highest in window: 117,417; 24 Dec 2025
Days with a balance: 73
Window: 16 Sep 2025 to 14 Sep 2026

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 117K shares.

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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/lbrx/" width="100%" height="430" style="border:0" loading="lazy" title="LB Pharmaceuticals Inc short interest chart"></iframe>
<p>Source: FINRA data compiled by <a href="https://howshorted.com/us/company/lbrx/">howshorted.com</a></p>

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Cite this page

Plain

Short position data for LB Pharmaceuticals Inc: FINRA, compiled by howshorted.com, settlement date 15 Sep 2026. https://howshorted.com/us/company/lbrx/

Wikipedia

<ref>{{cite web |title=LB Pharmaceuticals Inc short position data |url=https://howshorted.com/us/company/lbrx/ |website=HowShorted |publisher=howshorted.com (data: FINRA) |date=2026-09-15 |access-date=2026-10-13}}</ref>

BibTeX

@misc{howshorted-lb-pharmaceuticals-inc-2026-09-15,
  title        = {LB Pharmaceuticals Inc short position data},
  author       = {{HowShorted}},
  howpublished = {\url{https://howshorted.com/us/company/lbrx/}},
  note         = {Data: FINRA, settlement date 15 Sep 2026; accessed 2026-10-13},
  year         = {2026}
}

Sector: Healthcare

History

Full reported short interest history
Settlement date	Short %	Change
15 Sep 2026	17.41%	+1.05
31 Aug 2026	16.36%	+0.38
14 Aug 2026	15.98%	−0.57
31 Jul 2026	16.55%	+1.69
15 Jul 2026	14.86%	−1.01
30 Jun 2026	15.87%	+0.87
15 Jun 2026	15.00%	+1.00
29 May 2026	14.00%	−0.01
15 May 2026	14.01%	+0.76
30 Apr 2026	13.25%	+2.40
15 Apr 2026	10.85%	+1.71
31 Mar 2026	9.14%	+7.30
15 Dec 2025	1.84%	–

Newest first. Scroll inside the table for earlier dates, back to 15 Dec 2025.

Frequently asked questions

How shorted is LB Pharmaceuticals Inc right now?: 17.41% of LB Pharmaceuticals Inc's (LBRX) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 197th 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 LBRX'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 LBRX's days to cover?: 21.45 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.