Atara Biotherapeutics, Inc. short interest in 2021

In 2021, Atara Biotherapeutics, Inc.'s disclosed short interest ran from 14.49% of shares outstanding on 15 Jan 2021 to 10.66% on 31 Dec 2021, a change of -3.83 percentage points. The year's high was 16.88% on 31 Mar 2021 and its low 9.83% on 30 Nov 2021, averaging 13.95% across 24 twice-monthly settlement dates. FINRA's days-to-cover figure peaked at 23.30 days on 13 Aug 2021. Full history: Atara Biotherapeutics, Inc..

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Plain

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

Wikipedia

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

BibTeX

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

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2021 in figures

Start of year: 14.49% (15 Jan 2021)
End of year: 10.66% (31 Dec 2021)
Change: -3.83 pp
High: 16.88% (31 Mar 2021)
Low: 9.83% (30 Nov 2021)
Average: 13.95%
Highest days to cover: 23.30 (13 Aug 2021)
SEC filings marked: 8

Every report in 2021

Atara Biotherapeutics, Inc. short interest in 2021
Settlement	Short interest	Days to cover	Filings since previous
15 Jan 2021	14.49%	14.38
29 Jan 2021	15.21%	12.68
12 Feb 2021	15.10%	17.94
26 Feb 2021	14.29%	18.78
15 Mar 2021	15.07%	13.71	10-K filed, results (8-K)
31 Mar 2021	16.88%	14.43
15 Apr 2021	16.08%	19.89
30 Apr 2021	14.44%	10.00
14 May 2021	15.20%	14.77	10-Q filed, results (8-K)
28 May 2021	15.10%	18.46
15 Jun 2021	15.03%	15.82
30 Jun 2021	13.87%	10.82
15 Jul 2021	14.37%	16.48
30 Jul 2021	15.41%	22.97
13 Aug 2021	15.08%	23.30	10-Q filed, results (8-K)
31 Aug 2021	14.42%	13.94
15 Sep 2021	14.72%	19.71
30 Sep 2021	13.83%	13.16
15 Oct 2021	12.94%	11.32
29 Oct 2021	12.25%	17.50
15 Nov 2021	10.16%	9.94	10-Q filed, results (8-K)
30 Nov 2021	9.83%	11.97
15 Dec 2021	10.30%	12.07
31 Dec 2021	10.66%	10.24

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.