bluebird bio, Inc. short interest in 2020

In 2020, bluebird bio, Inc.'s disclosed short interest ran from 15.46% of shares outstanding on 15 Jan 2020 to 10.87% on 31 Dec 2020, a change of -4.59 percentage points. The year's high was 15.46% on 15 Jan 2020 and its low 9.24% on 30 Sep 2020, averaging 12.15% across 24 twice-monthly settlement dates. FINRA's days-to-cover figure peaked at 14.13 days on 14 Feb 2020. Full history: bluebird bio, Inc..

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Plain

Short position data for bluebird bio, Inc. short interest in 2020: FINRA, compiled by howshorted.com, settlement date 31 Dec 2020. https://howshorted.com/us/company/blue-2025/2020/

Wikipedia

<ref>{{cite web |title=bluebird bio, Inc. short interest in 2020 short position data |url=https://howshorted.com/us/company/blue-2025/2020/ |website=HowShorted |publisher=howshorted.com (data: FINRA) |date=2020-12-31 |access-date=2026-10-13}}</ref>

BibTeX

@misc{howshorted-bluebird-bio-inc-short-interest-in-2020-2020-12-31,
  title        = {bluebird bio, Inc. short interest in 2020 short position data},
  author       = {{HowShorted}},
  howpublished = {\url{https://howshorted.com/us/company/blue-2025/2020/}},
  note         = {Data: FINRA, settlement date 31 Dec 2020; accessed 2026-10-13},
  year         = {2020}
}

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2020 in figures

Start of year: 15.46% (15 Jan 2020)
End of year: 10.87% (31 Dec 2020)
Change: -4.59 pp
High: 15.46% (15 Jan 2020)
Low: 9.24% (30 Sep 2020)
Average: 12.15%
Highest days to cover: 14.13 (14 Feb 2020)
SEC filings marked: 8

Every report in 2020

bluebird bio, Inc. short interest in 2020
Settlement	Short interest	Days to cover	Filings since previous
15 Jan 2020	15.46%	11.04	results (8-K)
31 Jan 2020	15.06%	8.29
14 Feb 2020	14.60%	14.13
28 Feb 2020	14.44%	6.79	10-K filed, results (8-K)
13 Mar 2020	13.91%	10.09
31 Mar 2020	13.77%	7.27
15 Apr 2020	13.65%	6.53
30 Apr 2020	13.34%	4.51
15 May 2020	13.79%	5.17	10-Q filed, results (8-K)
29 May 2020	13.65%	3.71
15 Jun 2020	13.57%	7.33
30 Jun 2020	13.21%	6.49
15 Jul 2020	12.53%	7.47
31 Jul 2020	10.60%	10.87
14 Aug 2020	10.38%	9.97	10-Q filed
31 Aug 2020	10.34%	14.02
15 Sep 2020	9.31%	9.92
30 Sep 2020	9.24%	9.54
15 Oct 2020	9.28%	10.11
30 Oct 2020	9.55%	12.41
13 Nov 2020	10.29%	4.00	10-Q filed, results (8-K)
30 Nov 2020	10.31%	7.97
15 Dec 2020	10.48%	5.91
31 Dec 2020	10.87%	7.86

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.