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HowShorted

How shorted was Arcellx, Inc.? ACLX

Arcellx, Inc. left the US market in 2026. This page is a frozen archive of its reported short interest, ending 15 Apr 2026. The ticker ACLX no longer refers to this company and may since have been reassigned.
3.08%
of shares outstanding reported short · settlement date 15 Apr 2026
vs previous report
−0.80
5 reports (~10 weeks)
−12.67
days to cover
2.52
Aggregate net short position time series for Arcellx, 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 Arcellx, 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
5 Nov 20259.77% 31 Oct 202510.21% 14 Nov 2025+0.44
7 Aug 202511.67% 31 Jul 202511.59% 15 Aug 2025−0.08
8 May 202513.03% 30 Apr 202512.93% 15 May 2025−0.10
27 Feb 202513.38% 14 Feb 202513.25% 28 Feb 2025−0.13
7 Nov 20247.31% 31 Oct 20248.23% 15 Nov 2024+0.92
8 Aug 20248.35% 31 Jul 20249.35% 15 Aug 2024+1.00
9 May 20247.95% 30 Apr 20247.24% 15 May 2024−0.71
28 Feb 20247.31% 15 Feb 20247.05% 29 Feb 2024−0.26
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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Apr 20263.08%−0.80
31 Mar 20263.88%−4.15
13 Mar 20268.03%−1.83
27 Feb 20269.86%−6.21
13 Feb 202616.07%+0.32
30 Jan 202615.75%−0.02
15 Jan 202615.77%−0.28
31 Dec 202516.05%+2.02
15 Dec 202514.03%+2.88
28 Nov 202511.15%+0.94
14 Nov 202510.21%+0.44
31 Oct 20259.77%−1.52
15 Oct 202511.29%+0.51
30 Sep 202510.78%−1.35
15 Sep 202512.13%−0.52
29 Aug 202512.65%+1.06
15 Aug 202511.59%−0.08
31 Jul 202511.67%+0.74
15 Jul 202510.93%−0.20
30 Jun 202511.13%−0.20
13 Jun 202511.33%−0.61
30 May 202511.94%−0.99
15 May 202512.93%−0.10
30 Apr 202513.03%−0.01
15 Apr 202513.04%+0.18
31 Mar 202512.86%−0.17
14 Mar 202513.03%−0.22
28 Feb 202513.25%−0.13
14 Feb 202513.38%−0.14
31 Jan 202513.52%+1.13
15 Jan 202512.39%+1.65
31 Dec 202410.74%+0.66
13 Dec 202410.08%+0.41
29 Nov 20249.67%+1.44
15 Nov 20248.23%+0.92
31 Oct 20247.31%−0.44
15 Oct 20247.75%+0.38
30 Sep 20247.37%−1.47
13 Sep 20248.84%−0.58
30 Aug 20249.42%+0.07
15 Aug 20249.35%+1.00
31 Jul 20248.35%−0.99
15 Jul 20249.34%+0.42
28 Jun 20248.92%−0.07
14 Jun 20248.99%+0.84
31 May 20248.15%+0.91
15 May 20247.24%−0.71
30 Apr 20247.95%−0.32
15 Apr 20248.27%+0.53
28 Mar 20247.74%+0.33
15 Mar 20247.41%+0.36
29 Feb 20247.05%−0.26
15 Feb 20247.31%−0.84
31 Jan 20248.15%+0.09
12 Jan 20248.06%−0.10
29 Dec 20238.16%−1.43
15 Dec 20239.59%−0.82
30 Nov 202310.41%−0.88
15 Nov 202311.29%−0.96
31 Oct 202312.25%+0.73
13 Oct 202311.52%−1.43
29 Sep 202312.95%+0.14
15 Sep 202312.81%−0.85
31 Aug 202313.66%−2.78
15 Aug 202316.44%+0.13
31 Jul 202316.31%−0.01
14 Jul 202316.32%+0.36
30 Jun 202315.96%+2.29
15 Jun 202313.67%+0.92
31 May 202312.75%+0.07
15 May 202312.68%+0.65
28 Apr 202312.03%+0.77
14 Apr 202311.26%+0.81
31 Mar 202310.45%+2.44
15 Mar 20238.01%+0.90
28 Feb 20237.11%+0.53
15 Feb 20236.58%+0.29
31 Jan 20236.29%+0.11
13 Jan 20236.18%+0.73
30 Dec 20225.45%−0.15
15 Dec 20225.60%−0.90
30 Nov 20226.50%−0.23
15 Nov 20226.73%+0.51
31 Oct 20226.22%−0.45
14 Oct 20226.67%−0.25
30 Sep 20226.92%+3.91
15 Sep 20223.01%+0.76
31 Aug 20222.25%−0.13
15 Aug 20222.38%+1.66
31 May 20220.72%−0.03
13 May 20220.75%–

Newest first. Scroll inside the table for earlier dates, back to 13 May 2022.

Frequently asked questions

How shorted was Arcellx, Inc.?
Arcellx, Inc. left the US market in 2026. Its final reported figure was 3.08% of shares outstanding for settlement date 15 Apr 2026, 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 ACLX'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 ACLX's days to cover?
2.52 days for settlement date 15 Apr 2026: 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.