Altimmune, Inc. short interest in 2021

In 2021, Altimmune, Inc.'s disclosed short interest ran from 7.86% of shares outstanding on 15 Jan 2021 to 11.29% on 31 Dec 2021, a change of +3.43 percentage points. The year's high was 16.76% on 15 Sep 2021 and its low 6.50% on 26 Feb 2021, averaging 12.12% across 24 twice-monthly settlement dates. FINRA's days-to-cover figure peaked at 7.49 days on 14 May 2021. Full history: Altimmune, Inc..

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Plain

Short position data for Altimmune, Inc. short interest in 2021: FINRA, compiled by howshorted.com, settlement date 31 Dec 2021. https://howshorted.com/us/company/alt/2021/

Wikipedia

<ref>{{cite web |title=Altimmune, Inc. short interest in 2021 short position data |url=https://howshorted.com/us/company/alt/2021/ |website=HowShorted |publisher=howshorted.com (data: FINRA) |date=2021-12-31 |access-date=2026-10-13}}</ref>

BibTeX

@misc{howshorted-altimmune-inc-short-interest-in-2021-2021-12-31,
  title        = {Altimmune, Inc. short interest in 2021 short position data},
  author       = {{HowShorted}},
  howpublished = {\url{https://howshorted.com/us/company/alt/2021/}},
  note         = {Data: FINRA, settlement date 31 Dec 2021; accessed 2026-10-13},
  year         = {2021}
}

By year: 2019 · 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026

2021 in figures

Start of year: 7.86% (15 Jan 2021)
End of year: 11.29% (31 Dec 2021)
Change: +3.43 pp
High: 16.76% (15 Sep 2021)
Low: 6.50% (26 Feb 2021)
Average: 12.12%
Highest days to cover: 7.49 (14 May 2021)
SEC filings marked: 8

Every report in 2021

Altimmune, Inc. short interest in 2021
Settlement	Short interest	Days to cover	Filings since previous
15 Jan 2021	7.86%	2.18
29 Jan 2021	7.89%	1.41
12 Feb 2021	7.63%	1.29
26 Feb 2021	6.50%	1.58	10-K filed, results (8-K)
15 Mar 2021	7.99%	2.20
31 Mar 2021	14.58%	3.47
15 Apr 2021	13.04%	6.87
30 Apr 2021	13.59%	5.78
14 May 2021	14.16%	7.49
28 May 2021	11.38%	4.27	10-Q filed, results (8-K)
15 Jun 2021	11.34%	3.86
30 Jun 2021	12.48%	1.00
15 Jul 2021	14.17%	2.45
30 Jul 2021	13.47%	6.67
13 Aug 2021	13.23%	4.49	10-Q filed, results (8-K)
31 Aug 2021	16.06%	5.52
15 Sep 2021	16.76%	4.66
30 Sep 2021	15.43%	2.20
15 Oct 2021	14.40%	7.27
29 Oct 2021	14.12%	7.42
15 Nov 2021	11.98%	5.70	10-Q filed, results (8-K)
30 Nov 2021	10.85%	6.85
15 Dec 2021	10.78%	5.62
31 Dec 2021	11.29%	5.18

About this data

US short interest data: FINRA (finra.org), shown as reported shares short divided by SEC-reported shares outstanding for each settlement date. FINRA® is a registered trademark of the Financial Industry Regulatory Authority, Inc. This site is not affiliated with or endorsed by FINRA or the SEC; displayed for personal reference, bulk redistribution is not permitted (see terms). Nothing here is investment advice. Method: methodology.