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HowShorted

How shorted was ACELYRIN, INC.? SLRN

ACELYRIN, INC. left the US market in 2025. This page is a frozen archive of its reported short interest, ending 15 May 2025. The ticker SLRN no longer refers to this company and may since have been reassigned.
4.21%
of shares outstanding reported short · settlement date 15 May 2025
vs previous report
+0.67
5 reports (~10 weeks)
−0.08
days to cover
3.86
Aggregate net short position time series for ACELYRIN, 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 ACELYRIN, 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
6 Feb 20255.85% 31 Jan 20254.70% 14 Feb 2025−1.15
13 Nov 20244.71% 31 Oct 20245.72% 15 Nov 2024+1.01
13 Aug 20247.34% 31 Jul 20246.94% 15 Aug 2024−0.40
9 May 20248.67% 30 Apr 20247.14% 15 May 2024−1.53
28 Mar 20248.64% 15 Mar 20247.98% 15 Apr 2024−0.66
7 Nov 20238.46% 31 Oct 20236.42% 15 Nov 2023−2.04
14 Aug 20236.07% 31 Jul 20235.63% 15 Aug 2023−0.44
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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 May 20254.21%+0.67
30 Apr 20253.54%−0.13
15 Apr 20253.67%+0.05
31 Mar 20253.62%−1.03
14 Mar 20254.65%+0.36
28 Feb 20254.29%−0.41
14 Feb 20254.70%−1.15
31 Jan 20255.85%−0.66
15 Jan 20256.51%+0.39
31 Dec 20246.12%+0.15
13 Dec 20245.97%+0.27
29 Nov 20245.70%−0.02
15 Nov 20245.72%+1.01
31 Oct 20244.71%−0.46
15 Oct 20245.17%−1.23
30 Sep 20246.40%+0.29
13 Sep 20246.11%−1.10
30 Aug 20247.21%+0.27
15 Aug 20246.94%−0.40
31 Jul 20247.34%+0.42
15 Jul 20246.92%−0.28
28 Jun 20247.20%+0.10
14 Jun 20247.10%+0.14
31 May 20246.96%−0.18
15 May 20247.14%−1.53
30 Apr 20248.67%+0.69
15 Apr 20247.98%−0.10
28 Mar 20248.08%−0.56
15 Mar 20248.64%+1.52
29 Feb 20247.12%+0.24
15 Feb 20246.88%+0.26
31 Jan 20246.62%+0.32
12 Jan 20246.30%−0.65
29 Dec 20236.95%−0.52
15 Dec 20237.47%+0.61
30 Nov 20236.86%+0.44
15 Nov 20236.42%−2.04
31 Oct 20238.46%−0.50
13 Oct 20238.96%+0.03
29 Sep 20238.93%+2.64
15 Sep 20236.29%−0.24
31 Aug 20236.53%+0.90
15 Aug 20235.63%−0.44
31 Jul 20236.07%−0.22
14 Jul 20236.29%–

Newest first. Scroll inside the table for earlier dates, back to 14 Jul 2023.

Frequently asked questions

How shorted was ACELYRIN, INC.?
ACELYRIN, INC. left the US market in 2025. Its final reported figure was 4.21% of shares outstanding for settlement date 15 May 2025, 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 SLRN'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 SLRN's days to cover?
3.86 days for settlement date 15 May 2025: 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.