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 ALDR'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 ALDR's days to cover?

2.50 days for settlement date 15 Oct 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 ALDER BIOPHARMACEUTICALS INC? ALDR

ALDER BIOPHARMACEUTICALS INC left the US market in 2019. This page is a frozen archive of its reported short interest, ending 15 Oct 2019. The ticker ALDR no longer refers to this company and may since have been reassigned.

11.28%

of shares outstanding reported short · settlement date 15 Oct 2019

vs previous report: −3.13
5 reports (~10 weeks): −6.89
days to cover: 2.50

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
6 Aug 2019	18.17% 31 Jul 2019	18.82% 15 Aug 2019	+0.65
2 May 2019	15.72% 30 Apr 2019	16.91% 15 May 2019	+1.19
25 Feb 2019	19.58% 15 Feb 2019	20.12% 28 Feb 2019	+0.54
5 Nov 2018	16.89% 31 Oct 2018	17.81% 15 Nov 2018	+0.92
7 Aug 2018	15.92% 31 Jul 2018	15.75% 15 Aug 2018	−0.17
8 May 2018	16.69% 30 Apr 2018	16.67% 15 May 2018	−0.02
26 Feb 2018	11.50% 15 Feb 2018	12.32% 28 Feb 2018	+0.82

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<iframe src="https://howshorted.com/embed/us/aldr-2020/" width="100%" height="430" style="border:0" loading="lazy" title="ALDER BIOPHARMACEUTICALS INC short interest chart"></iframe>
<p>Source: FINRA data compiled by <a href="https://howshorted.com/us/company/aldr-2020/">howshorted.com</a></p>

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Plain

Short position data for ALDER BIOPHARMACEUTICALS INC: FINRA, compiled by howshorted.com, settlement date 15 Oct 2019. https://howshorted.com/us/company/aldr-2020/

Wikipedia

<ref>{{cite web |title=ALDER BIOPHARMACEUTICALS INC short position data |url=https://howshorted.com/us/company/aldr-2020/ |website=HowShorted |publisher=howshorted.com (data: FINRA) |date=2019-10-15 |access-date=2026-10-13}}</ref>

BibTeX

@misc{howshorted-alder-biopharmaceuticals-inc-2019-10-15,
  title        = {ALDER BIOPHARMACEUTICALS INC short position data},
  author       = {{HowShorted}},
  howpublished = {\url{https://howshorted.com/us/company/aldr-2020/}},
  note         = {Data: FINRA, settlement date 15 Oct 2019; accessed 2026-10-13},
  year         = {2019}
}

Sector: Healthcare · By year: 2018 · 2019

History

Full reported short interest history
Settlement date	Short %	Change
15 Oct 2019	11.28%	−3.13
30 Sep 2019	14.41%	−5.47
13 Sep 2019	19.88%	+0.70
30 Aug 2019	19.18%	+0.36
15 Aug 2019	18.82%	+0.65
31 Jul 2019	18.17%	+0.21
15 Jul 2019	17.96%	−0.49
28 Jun 2019	18.45%	+2.56
14 Jun 2019	15.89%	−0.30
31 May 2019	16.19%	−0.72
15 May 2019	16.91%	+1.19
30 Apr 2019	15.72%	−3.46
15 Apr 2019	19.18%	+0.32
29 Mar 2019	18.86%	−0.07
15 Mar 2019	18.93%	−1.19
28 Feb 2019	20.12%	+0.54
15 Feb 2019	19.58%	+0.18
31 Jan 2019	19.40%	+1.12
15 Jan 2019	18.28%	+1.36
31 Dec 2018	16.92%	+0.85
14 Dec 2018	16.07%	−1.70
30 Nov 2018	17.77%	−0.04
15 Nov 2018	17.81%	+0.92
31 Oct 2018	16.89%	+0.90
15 Oct 2018	15.99%	−0.40
28 Sep 2018	16.39%	+0.61
14 Sep 2018	15.78%	+0.09
31 Aug 2018	15.69%	−0.06
15 Aug 2018	15.75%	−0.17
31 Jul 2018	15.92%	+0.19
13 Jul 2018	15.73%	−0.29
29 Jun 2018	16.02%	−1.85
15 Jun 2018	17.87%	+1.05
31 May 2018	16.82%	+0.15
15 May 2018	16.67%	−0.02
30 Apr 2018	16.69%	+0.44
13 Apr 2018	16.25%	+0.22
29 Mar 2018	16.03%	+2.41
15 Mar 2018	13.62%	+1.30
28 Feb 2018	12.32%	+0.82
15 Feb 2018	11.50%	+2.04
31 Jan 2018	9.46%	+0.28
12 Jan 2018	9.18%	+0.47
29 Dec 2017	8.71%	–

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

Frequently asked questions

How shorted was ALDER BIOPHARMACEUTICALS INC?: ALDER BIOPHARMACEUTICALS INC left the US market in 2019. Its final reported figure was 11.28% of shares outstanding for settlement date 15 Oct 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 ALDR'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 ALDR's days to cover?: 2.50 days for settlement date 15 Oct 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.