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HowShorted

How shorted was Rubius Therapeutics, Inc.? RUBY

Rubius Therapeutics, Inc. left the US market in 2023. This page is a frozen archive of its reported short interest, ending 28 Feb 2023. The ticker RUBY no longer refers to this company and may since have been reassigned.
3.10%
of shares outstanding reported short · settlement date 28 Feb 2023
vs previous report
+1.41
5 reports (~10 weeks)
+1.10
days to cover
1.00
Aggregate net short position time series for Rubius Therapeutics, Inc.

Markers along the chart's base: ▲ results announced (an 8-K reporting results was filed) ▲ quarterly or annual report filed. Dates are SEC filing dates; hover a point to see events since the previous settlement.

Days to cover

FINRA's own figure: reported shares short divided by the stock's average daily trading volume, published alongside each settlement. It expresses the short position in days of typical trading rather than as a percentage of the company; the two can move differently.

Aggregate net short position time series for Rubius Therapeutics, Inc. days to cover

Short interest around results

For each results announcement (an 8-K reporting results, by its SEC filing date), the FINRA settlement before it and the first one after. Settlements fall twice a month, so the two figures can sit up to a month apart and much else changes in between: this shows what was reported, not why.

Reported short interest before and after each results announcement
Results filedSettlement beforeSettlement afterChange
9 Aug 20224.17% 29 Jul 20223.89% 15 Aug 2022−0.28
10 May 20227.75% 29 Apr 20227.02% 13 May 2022−0.73
25 Feb 202211.75% 15 Feb 202212.18% 28 Feb 2022+0.43
8 Nov 20218.04% 29 Oct 20218.60% 15 Nov 2021+0.56
9 Aug 20217.43% 30 Jul 20217.43% 13 Aug 20210.00
10 May 20215.22% 30 Apr 20215.12% 14 May 2021−0.10
23 Feb 20219.13% 12 Feb 20219.24% 26 Feb 2021+0.11
9 Nov 202010.65% 30 Oct 202010.98% 13 Nov 2020+0.33
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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
28 Feb 20233.10%+1.41
15 Feb 20231.69%−0.38
31 Jan 20232.07%−0.68
13 Jan 20232.75%+0.49
30 Dec 20222.26%+0.26
15 Dec 20222.00%+0.12
30 Nov 20221.88%−0.19
15 Nov 20222.07%−0.35
31 Oct 20222.42%−0.53
14 Oct 20222.95%−0.36
30 Sep 20223.31%+0.54
15 Sep 20222.77%+0.11
31 Aug 20222.66%−1.23
15 Aug 20223.89%−0.28
29 Jul 20224.17%−0.09
15 Jul 20224.26%−0.13
30 Jun 20224.39%−1.70
15 Jun 20226.09%−0.57
31 May 20226.66%−0.36
13 May 20227.02%−0.73
29 Apr 20227.75%−0.37
14 Apr 20228.12%−2.10
31 Mar 202210.22%−0.66
15 Mar 202210.88%−1.30
28 Feb 202212.18%+0.43
15 Feb 202211.75%+1.33
31 Jan 202210.42%+1.29
14 Jan 20229.13%−1.09
31 Dec 202110.22%+0.41
15 Dec 20219.81%+1.64
30 Nov 20218.17%−0.43
15 Nov 20218.60%+0.56
29 Oct 20218.04%−0.07
15 Oct 20218.11%−0.14
30 Sep 20218.25%+0.05
15 Sep 20218.20%+0.09
31 Aug 20218.11%+0.68
13 Aug 20217.43%0.00
30 Jul 20217.43%+0.20
15 Jul 20217.23%−0.18
30 Jun 20217.41%+1.90
15 Jun 20215.51%+0.04
28 May 20215.47%+0.35
14 May 20215.12%−0.10
30 Apr 20215.22%−0.43
15 Apr 20215.65%−2.22
31 Mar 20217.87%−3.81
15 Mar 202111.68%+2.44
26 Feb 20219.24%+0.11
12 Feb 20219.13%−0.25
29 Jan 20219.38%−0.50
15 Jan 20219.88%−2.87
31 Dec 202012.75%+1.38
15 Dec 202011.37%+0.30
30 Nov 202011.07%+0.09
13 Nov 202010.98%+0.33
30 Oct 202010.65%+0.29
15 Oct 202010.36%+0.01
30 Sep 202010.35%+0.98
15 Sep 20209.37%−0.14
31 Aug 20209.51%−0.25
14 Aug 20209.76%−0.01
31 Jul 20209.77%−0.11
15 Jul 20209.88%+0.40
30 Jun 20209.48%+0.65
15 Jun 20208.83%+0.08
29 May 20208.75%+0.08
15 May 20208.67%−0.99
30 Apr 20209.66%−0.03
15 Apr 20209.69%+0.33
31 Mar 20209.36%−3.23
13 Mar 202012.59%−0.26
28 Feb 202012.85%−0.12
14 Feb 202012.97%+0.11
31 Jan 202012.86%+0.15
15 Jan 202012.71%+0.43
31 Dec 201912.28%+0.85
13 Dec 201911.43%−0.36
29 Nov 201911.79%−0.93
15 Nov 201912.72%+0.60
31 Oct 201912.12%+0.20
15 Oct 201911.92%–

Newest first. Scroll inside the table for earlier dates, back to 15 Oct 2019.

Frequently asked questions

How shorted was Rubius Therapeutics, Inc.?
Rubius Therapeutics, Inc. left the US market in 2023. Its final reported figure was 3.10% of shares outstanding for settlement date 28 Feb 2023, per FINRA's consolidated short interest report; this page preserves its full history.
What does this number include?
FINRA member firms must report their short positions in all US equities twice a month; FINRA consolidates them per security. We divide that official share count by the company's shares outstanding from its SEC filings. This is the regulatory figure, not a daily estimate.
Why does it only update twice a month?
US short interest is reported for settlement on the 15th and the last business day of each month, and FINRA publishes the consolidated figures about nine business days later. That cadence is set by regulation; no daily official figure exists.
Is this RUBY's short float?
No. This is short interest as a percentage of shares outstanding, the count in the company's SEC filings. "Short float" divides the same FINRA short count by the public float, which excludes closely held shares, so it comes out higher for the same company. We publish no float estimates: the float is not a regulatory figure.
What is RUBY's days to cover?
1.00 days for settlement date 28 Feb 2023: FINRA's own short interest ratio, the reported shares short divided by average daily trading volume. It is published in the same FINRA file and shown verbatim; we hold no volume data ourselves.
Which funds are short?
US public short interest is aggregate-only: individual short sellers are not named. Only some EU markets publish named positions.