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HowShorted

How shorted is ACM Research, Inc.? ACMR

#1,397most shorted US stockof 3,805 ranked stocks, more shorted than 63%

5.94%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.24
5 reports (~10 weeks)
+1.04
days to cover
4.64
Aggregate net short position time series for ACM Research, 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 ACM Research, 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
7 Aug 20265.44% 31 Jul 20264.72% 14 Aug 2026−0.72
7 May 20264.17% 30 Apr 20264.23% 15 May 2026+0.06
27 Apr 20264.06% 15 Apr 20264.17% 30 Apr 2026+0.11
26 Feb 20265.63% 13 Feb 20265.11% 27 Feb 2026−0.52
22 Jan 20265.54% 15 Jan 20264.69% 30 Jan 2026−0.85
5 Nov 20256.27% 31 Oct 20256.96% 14 Nov 2025+0.69
29 Oct 20256.88% 15 Oct 20256.27% 31 Oct 2025−0.61
6 Aug 20254.92% 31 Jul 20256.27% 15 Aug 2025+1.35

Fails to deliver

The SEC's fails-to-deliver figure for ACMR: the aggregate net balance of shares that failed to be delivered at each settlement date, published by the SEC twice a month and shown here verbatim for the trailing window. A balance is not a daily flow, and a fail has many ordinary causes; the SEC says it cannot guarantee the accuracy of the data. See what fails to deliver are and the largest balances today.

Last balance on file
29,486
9 Sep 2026
Highest in window
86,810
24 Nov 2025
Days with a balance
54
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for ACM Research, Inc. fails to deliver

Source: U.S. Securities and Exchange Commission, fails-to-deliver data (public domain). Only settlement days with a positive balance appear; the largest balance in the window was 87K shares.

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Sector: Industrials

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20265.94%+0.24
31 Aug 20265.70%+0.98
14 Aug 20264.72%−0.72
31 Jul 20265.44%−0.47
15 Jul 20265.91%+1.01
30 Jun 20264.90%+1.34
15 Jun 20263.56%−0.99
29 May 20264.55%+0.32
15 May 20264.23%+0.06
30 Apr 20264.17%+0.11
15 Apr 20264.06%−0.69
31 Mar 20264.75%−0.13
13 Mar 20264.88%−0.23
27 Feb 20265.11%−0.52
13 Feb 20265.63%+0.94
30 Jan 20264.69%−0.85
15 Jan 20265.54%−0.86
31 Dec 20256.40%−0.71
15 Dec 20257.11%+0.38
28 Nov 20256.73%−0.23
14 Nov 20256.96%+0.69
31 Oct 20256.27%−0.61
15 Oct 20256.88%−1.47
30 Sep 20258.35%+1.67
15 Sep 20256.68%+0.25
29 Aug 20256.43%+0.16
15 Aug 20256.27%+1.35
31 Jul 20254.92%−0.14
15 Jul 20255.06%−0.17
30 Jun 20255.23%−0.69
13 Jun 20255.92%+0.47
30 May 20255.45%−0.35
15 May 20255.80%−1.42
30 Apr 20257.22%+1.99
15 Apr 20255.23%−0.11
31 Mar 20255.34%−0.27
14 Mar 20255.61%−0.65
28 Feb 20256.26%−0.30
14 Feb 20256.56%+0.98
31 Jan 20255.58%−1.11
15 Jan 20256.69%−0.42
31 Dec 20247.11%+0.23
13 Dec 20246.88%+0.62
29 Nov 20246.26%−0.11
15 Nov 20246.37%−0.92
31 Oct 20247.29%−0.64
15 Oct 20247.93%+0.36
30 Sep 20247.57%−0.37
13 Sep 20247.94%+0.58
30 Aug 20247.36%+0.01
15 Aug 20247.35%+0.09
31 Jul 20247.26%+0.90
15 Jul 20246.36%−0.47
28 Jun 20246.83%+0.31
14 Jun 20246.52%+0.20
31 May 20246.32%−0.22
15 May 20246.54%+0.33
30 Apr 20246.21%−0.44
15 Apr 20246.65%+0.73
28 Mar 20245.92%+0.61
15 Mar 20245.31%−2.55
29 Feb 20247.86%+1.91
15 Feb 20245.95%−0.17
31 Jan 20246.12%+0.26
12 Jan 20245.86%+0.74
29 Dec 20235.12%−0.23
15 Dec 20235.35%+0.63
30 Nov 20234.72%−0.16
15 Nov 20234.88%−0.02
31 Oct 20234.90%+0.51
13 Oct 20234.39%+0.33
29 Sep 20234.06%+0.74
15 Sep 20233.32%+0.32
31 Aug 20233.00%−0.39
15 Aug 20233.39%+0.12
31 Jul 20233.27%−0.01
14 Jul 20233.28%−0.14
30 Jun 20233.42%−0.25
15 Jun 20233.67%+0.07
31 May 20233.60%−0.12
15 May 20233.72%+0.26
28 Apr 20233.46%−0.24
14 Apr 20233.70%−0.21
31 Mar 20233.91%+0.05
15 Mar 20233.86%−0.12
28 Feb 20233.98%−0.86
15 Feb 20234.84%+0.23
31 Jan 20234.61%+0.01
13 Jan 20234.60%−0.22
30 Dec 20224.82%−3.62
15 Dec 20228.44%+0.27
30 Nov 20228.17%+2.26
15 Nov 20225.91%−1.28
31 Oct 20227.19%−0.46
14 Oct 20227.65%−0.66
30 Sep 20228.31%−0.10
15 Sep 20228.41%−0.46
31 Aug 20228.87%−1.50
15 Aug 202210.37%−1.02
29 Jul 202211.39%−1.86
15 Jul 202213.25%+2.25
30 Jun 202211.00%+3.77
15 Jun 20227.23%−0.44
31 May 20227.67%+0.94
13 May 20226.73%−1.29
15 Mar 20228.02%+1.98
28 Feb 20226.04%+0.56
15 Feb 20225.48%+0.10
31 Jan 20225.38%−0.57
14 Jan 20225.95%−0.39
31 Dec 20216.34%+0.08
15 Dec 20216.26%−0.39
30 Nov 20216.65%−1.26
15 Nov 20217.91%−1.55
29 Oct 20219.46%+1.42
15 Oct 20218.04%−0.44
30 Sep 20218.48%−0.74
15 Sep 20219.22%−0.53
31 Aug 20219.75%+2.52
13 Aug 20217.23%+2.26
30 Jul 20214.97%−1.31
15 Jul 20216.28%+1.02
30 Jun 20215.26%+0.04
15 Jun 20215.22%−0.37
28 May 20215.59%+0.40
14 May 20215.19%+0.17
30 Apr 20215.02%+0.14
15 Apr 20214.88%−0.69
31 Mar 20215.57%+0.28
15 Mar 20215.29%+0.71
26 Feb 20214.58%−0.10
12 Feb 20214.68%−0.43
29 Jan 20215.11%−0.66
15 Jan 20215.77%−0.11
31 Dec 20205.88%+0.06
15 Dec 20205.82%−0.02
30 Nov 20205.84%−0.48
13 Nov 20206.32%0.00
30 Oct 20206.32%+0.39
15 Oct 20205.93%−0.14
30 Sep 20206.07%−0.18
15 Sep 20206.25%+0.11
31 Aug 20206.14%−0.25
14 Aug 20206.39%+5.55
29 Nov 20190.84%+0.02
15 Nov 20190.82%+0.13
31 Oct 20190.69%−0.02
15 Oct 20190.71%–

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

Frequently asked questions

How shorted is ACM Research, Inc. right now?
5.94% of ACM Research, Inc.'s (ACMR) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 1,397th most shorted US stock, out of 3,805 we rank.
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 ACMR'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 ACMR's days to cover?
4.64 days for settlement date 15 Sep 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.