bluebird bio, Inc. short interest in 2019

In 2019, bluebird bio, Inc.'s disclosed short interest ran from 9.13% of shares outstanding on 15 Jan 2019 to 15.46% on 31 Dec 2019, a change of +6.33 percentage points. The year's high was 16.20% on 30 Sep 2019 and its low 9.13% on 15 Jan 2019, averaging 12.69% across 24 twice-monthly settlement dates. FINRA's days-to-cover figure peaked at 15.13 days on 30 Aug 2019. Full history: bluebird bio, Inc..

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Plain

Short position data for bluebird bio, Inc. short interest in 2019: FINRA, compiled by howshorted.com, settlement date 31 Dec 2019. https://howshorted.com/us/company/blue-2025/2019/

Wikipedia

<ref>{{cite web |title=bluebird bio, Inc. short interest in 2019 short position data |url=https://howshorted.com/us/company/blue-2025/2019/ |website=HowShorted |publisher=howshorted.com (data: FINRA) |date=2019-12-31 |access-date=2026-10-13}}</ref>

BibTeX

@misc{howshorted-bluebird-bio-inc-short-interest-in-2019-2019-12-31,
  title        = {bluebird bio, Inc. short interest in 2019 short position data},
  author       = {{HowShorted}},
  howpublished = {\url{https://howshorted.com/us/company/blue-2025/2019/}},
  note         = {Data: FINRA, settlement date 31 Dec 2019; accessed 2026-10-13},
  year         = {2019}
}

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2019 in figures

Start of year: 9.13% (15 Jan 2019)
End of year: 15.46% (31 Dec 2019)
Change: +6.33 pp
High: 16.20% (30 Sep 2019)
Low: 9.13% (15 Jan 2019)
Average: 12.69%
Highest days to cover: 15.13 (30 Aug 2019)
SEC filings marked: 8

Every report in 2019

bluebird bio, Inc. short interest in 2019
Settlement	Short interest	Days to cover	Filings since previous
15 Jan 2019	9.13%	8.69
31 Jan 2019	9.68%	7.75
15 Feb 2019	9.75%	14.60
28 Feb 2019	9.87%	7.49	10-K filed, results (8-K)
15 Mar 2019	9.42%	9.25
29 Mar 2019	9.36%	13.17
15 Apr 2019	9.76%	12.54
30 Apr 2019	9.34%	9.07
15 May 2019	9.42%	9.70	10-Q filed, results (8-K)
31 May 2019	10.03%	14.61
14 Jun 2019	11.42%	12.71
28 Jun 2019	14.57%	9.37
15 Jul 2019	13.54%	14.00
31 Jul 2019	13.58%	14.54
15 Aug 2019	14.81%	13.48	10-Q filed, results (8-K)
30 Aug 2019	15.29%	15.13
13 Sep 2019	15.79%	14.67
30 Sep 2019	16.20%	12.28
15 Oct 2019	16.12%	10.27
31 Oct 2019	15.91%	13.48	10-Q filed, results (8-K)
15 Nov 2019	15.96%	7.25
29 Nov 2019	14.69%	5.50
13 Dec 2019	15.56%	4.89
31 Dec 2019	15.46%	7.41

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.