bluebird bio, Inc. short interest in 2018

In 2018, bluebird bio, Inc.'s disclosed short interest ran from 6.68% of shares outstanding on 12 Jan 2018 to 9.26% on 31 Dec 2018, a change of +2.58 percentage points. The year's high was 9.26% on 31 Dec 2018 and its low 6.68% on 12 Jan 2018, averaging 7.74% across 24 twice-monthly settlement dates. FINRA's days-to-cover figure peaked at 8.49 days on 31 Aug 2018. Full history: bluebird bio, Inc..

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Plain

Short position data for bluebird bio, Inc. short interest in 2018: FINRA, compiled by howshorted.com, settlement date 31 Dec 2018. https://howshorted.com/us/company/blue-2025/2018/

Wikipedia

<ref>{{cite web |title=bluebird bio, Inc. short interest in 2018 short position data |url=https://howshorted.com/us/company/blue-2025/2018/ |website=HowShorted |publisher=howshorted.com (data: FINRA) |date=2018-12-31 |access-date=2026-10-13}}</ref>

BibTeX

@misc{howshorted-bluebird-bio-inc-short-interest-in-2018-2018-12-31,
  title        = {bluebird bio, Inc. short interest in 2018 short position data},
  author       = {{HowShorted}},
  howpublished = {\url{https://howshorted.com/us/company/blue-2025/2018/}},
  note         = {Data: FINRA, settlement date 31 Dec 2018; accessed 2026-10-13},
  year         = {2018}
}

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2018 in figures

Start of year: 6.68% (12 Jan 2018)
End of year: 9.26% (31 Dec 2018)
Change: +2.58 pp
High: 9.26% (31 Dec 2018)
Low: 6.68% (12 Jan 2018)
Average: 7.74%
Highest days to cover: 8.49 (31 Aug 2018)
SEC filings marked: 9

Every report in 2018

bluebird bio, Inc. short interest in 2018
Settlement	Short interest	Days to cover	Filings since previous
12 Jan 2018	6.68%	4.90	results (8-K)
31 Jan 2018	7.09%	2.56
15 Feb 2018	7.82%	4.55
28 Feb 2018	7.55%	6.23	10-K filed, results (8-K)
15 Mar 2018	7.81%	5.28
29 Mar 2018	7.41%	2.80
13 Apr 2018	7.68%	4.29
30 Apr 2018	7.52%	7.99
15 May 2018	7.16%	7.00	10-Q filed, results (8-K)
31 May 2018	7.31%	5.25
15 Jun 2018	7.56%	4.19
29 Jun 2018	7.81%	2.36
13 Jul 2018	7.10%	4.92
31 Jul 2018	7.21%	4.60
15 Aug 2018	7.14%	6.98	10-Q filed, results (8-K)
31 Aug 2018	7.08%	8.49
14 Sep 2018	7.92%	6.15
28 Sep 2018	7.69%	7.78
15 Oct 2018	8.86%	5.29
31 Oct 2018	8.40%	5.07
15 Nov 2018	8.95%	6.41	10-Q filed, results (8-K)
30 Nov 2018	8.71%	7.84
14 Dec 2018	8.13%	4.43
31 Dec 2018	9.26%	5.54

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.