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HowShorted

How shorted is AXCELIS TECHNOLOGIES INC? ACLS

#1,798most shorted US stockof 3,805 ranked stocks, more shorted than 52%

4.65%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.61
5 reports (~10 weeks)
−1.53
days to cover
4.48
Aggregate net short position time series for AXCELIS TECHNOLOGIES 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 AXCELIS TECHNOLOGIES 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 Aug 20265.25% 31 Jul 20265.45% 14 Aug 2026+0.20
7 May 20269.65% 30 Apr 20268.56% 15 May 2026−1.09
17 Feb 202616.10% 13 Feb 202611.93% 27 Feb 2026−4.17
4 Nov 202513.94% 31 Oct 202512.31% 14 Nov 2025−1.63
5 Aug 202516.45% 31 Jul 202514.58% 15 Aug 2025−1.87
6 May 202517.26% 30 Apr 202516.24% 15 May 2025−1.02
10 Feb 202514.41% 31 Jan 202514.60% 14 Feb 2025+0.19
6 Nov 202413.20% 31 Oct 202413.60% 15 Nov 2024+0.40

Fails to deliver

The SEC's fails-to-deliver figure for ACLS: 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
300
24 Aug 2026
Highest in window
31,697
30 Jun 2026
Days with a balance
81
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for AXCELIS TECHNOLOGIES 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 32K shares.

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Sector: Technology

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20264.65%−0.61
31 Aug 20265.26%−0.19
14 Aug 20265.45%+0.20
31 Jul 20265.25%−0.51
15 Jul 20265.76%−0.42
30 Jun 20266.18%−0.05
15 Jun 20266.23%−2.06
29 May 20268.29%−0.27
15 May 20268.56%−1.09
30 Apr 20269.65%−1.65
15 Apr 202611.30%−0.95
31 Mar 202612.25%+0.30
13 Mar 202611.95%+0.02
27 Feb 202611.93%−4.17
13 Feb 202616.10%+0.77
30 Jan 202615.33%+0.36
15 Jan 202614.97%+2.03
31 Dec 202512.94%−0.65
15 Dec 202513.59%+0.46
28 Nov 202513.13%+0.82
14 Nov 202512.31%−1.63
31 Oct 202513.94%−0.30
15 Oct 202514.24%+1.63
30 Sep 202512.61%−2.25
15 Sep 202514.86%+0.32
29 Aug 202514.54%−0.04
15 Aug 202514.58%−1.87
31 Jul 202516.45%−0.23
15 Jul 202516.68%−0.15
30 Jun 202516.83%+0.33
13 Jun 202516.50%−0.44
30 May 202516.94%+0.70
15 May 202516.24%−1.02
30 Apr 202517.26%+0.93
15 Apr 202516.33%+1.92
31 Mar 202514.41%−0.04
14 Mar 202514.45%+0.68
28 Feb 202513.77%−0.83
14 Feb 202514.60%+0.19
31 Jan 202514.41%+0.47
15 Jan 202513.94%+0.28
31 Dec 202413.66%+0.14
13 Dec 202413.52%+0.07
29 Nov 202413.45%−0.15
15 Nov 202413.60%+0.40
31 Oct 202413.20%+7.71
15 Oct 20245.49%−0.94
30 Sep 20246.43%−0.29
13 Sep 20246.72%+0.51
30 Aug 20246.21%−0.39
15 Aug 20246.60%−0.25
31 Jul 20246.85%+0.47
15 Jul 20246.38%−0.35
28 Jun 20246.73%+1.09
14 Jun 20245.64%−1.77
31 May 20247.41%+1.55
15 May 20245.86%−0.39
30 Apr 20246.25%+0.08
15 Apr 20246.17%+0.14
28 Mar 20246.03%−0.13
15 Mar 20246.16%+1.11
29 Feb 20245.05%+0.28
15 Feb 20244.77%+0.20
31 Jan 20244.57%−0.52
12 Jan 20245.09%+0.89
29 Dec 20234.20%−0.91
15 Dec 20235.11%+0.10
30 Nov 20235.01%+0.36
15 Nov 20234.65%−0.09
31 Oct 20234.74%+0.02
13 Oct 20234.72%+0.13
29 Sep 20234.59%+0.93
15 Sep 20233.66%−0.48
31 Aug 20234.14%+0.48
15 Aug 20233.66%−0.39
31 Jul 20234.05%−0.96
14 Jul 20235.01%−0.59
30 Jun 20235.60%−0.45
15 Jun 20236.05%+0.72
31 May 20235.33%+0.73
15 May 20234.60%−0.24
28 Apr 20234.84%+0.32
14 Apr 20234.52%−0.29
31 Mar 20234.81%+0.26
15 Mar 20234.55%−1.22
28 Feb 20235.77%+1.24
15 Feb 20234.53%+0.39
31 Jan 20234.14%+0.65
13 Jan 20233.49%−0.57
30 Dec 20224.06%+0.63
15 Dec 20223.43%+0.50
30 Nov 20222.93%−0.52
15 Nov 20223.45%−0.38
31 Oct 20223.83%−0.38
14 Oct 20224.21%+0.78
30 Sep 20223.43%+0.09
15 Sep 20223.34%+0.05
31 Aug 20223.29%+0.03
15 Aug 20223.26%−0.01
29 Jul 20223.27%−0.12
15 Jul 20223.39%+0.29
30 Jun 20223.10%−0.92
15 Jun 20224.02%+0.31
31 May 20223.71%−0.30
13 May 20224.01%+0.44
29 Apr 20223.57%+0.44
14 Apr 20223.13%+0.10
31 Mar 20223.03%+0.15
15 Mar 20222.88%+0.82
28 Feb 20222.06%−0.31
15 Feb 20222.37%+0.05
31 Jan 20222.32%−0.07
14 Jan 20222.39%−0.47
31 Dec 20212.86%−0.04
15 Dec 20212.90%+0.71
30 Nov 20212.19%+0.03
15 Nov 20212.16%−1.02
29 Oct 20213.18%−0.08
15 Oct 20213.26%−0.03
30 Sep 20213.29%−0.34
15 Sep 20213.63%+0.43
31 Aug 20213.20%+0.50
13 Aug 20212.70%+0.24
30 Jul 20212.46%−0.02
15 Jul 20212.48%+0.26
30 Jun 20212.22%−0.03
15 Jun 20212.25%+0.23
28 May 20212.02%+0.19
14 May 20211.83%−0.20
30 Apr 20212.03%−0.28
15 Apr 20212.31%+0.20
31 Mar 20212.11%−0.38
15 Mar 20212.49%−0.42
26 Feb 20212.91%+0.26
12 Feb 20212.65%−0.25
29 Jan 20212.90%−0.52
15 Jan 20213.42%+1.06
31 Dec 20202.36%+0.34
15 Dec 20202.02%+0.37
30 Nov 20201.65%−0.22
13 Nov 20201.87%−0.32
30 Oct 20202.19%−0.01
15 Oct 20202.20%+0.15
30 Sep 20202.05%−0.11
15 Sep 20202.16%−0.08
31 Aug 20202.24%−0.41
14 Aug 20202.65%−0.21
31 Jul 20202.86%−0.29
15 Jul 20203.15%−0.42
30 Jun 20203.57%+0.25
15 Jun 20203.32%+0.09
29 May 20203.23%+0.04
15 May 20203.19%−0.06
30 Apr 20203.25%+0.21
15 Apr 20203.04%−0.38
31 Mar 20203.42%−0.97
13 Mar 20204.39%+0.55
28 Feb 20203.84%+0.29
14 Feb 20203.55%+0.14
31 Jan 20203.41%−0.69
15 Jan 20204.10%+0.16
31 Dec 20193.94%+0.05
13 Dec 20193.89%+0.09
29 Nov 20193.80%+0.37
15 Nov 20193.43%−0.02
31 Oct 20193.45%+1.07
15 Oct 20192.38%+0.14
30 Sep 20192.24%+0.32
13 Sep 20191.92%−0.18
30 Aug 20192.10%+0.18
15 Aug 20191.92%+0.32
31 Jul 20191.60%−0.62
15 Jul 20192.22%−0.31
28 Jun 20192.53%+0.17
14 Jun 20192.36%−0.16
31 May 20192.52%−0.81
15 May 20193.33%+0.33
30 Apr 20193.00%+0.17
15 Apr 20192.83%−0.37
29 Mar 20193.20%−0.10
15 Mar 20193.30%−0.70
28 Feb 20194.00%−0.31
15 Feb 20194.31%+0.69
31 Jan 20193.62%−0.17
15 Jan 20193.79%−0.63
31 Dec 20184.42%−0.83
14 Dec 20185.25%−0.10
30 Nov 20185.35%+0.54
15 Nov 20184.81%−0.10
31 Oct 20184.91%−0.87
15 Oct 20185.78%−0.09
28 Sep 20185.87%−0.68
14 Sep 20186.55%−0.20
31 Aug 20186.75%−0.34
15 Aug 20187.09%−0.29
31 Jul 20187.38%−1.07
13 Jul 20188.45%−0.27
29 Jun 20188.72%+0.43
15 Jun 20188.29%+0.22
31 May 20188.07%+1.35
15 May 20186.72%+0.04
30 Apr 20186.68%−0.43
13 Apr 20187.11%−0.54
29 Mar 20187.65%+0.68
15 Mar 20186.97%−0.17
28 Feb 20187.14%+0.81
15 Feb 20186.33%−0.57
31 Jan 20186.90%−1.54
12 Jan 20188.44%+0.33
29 Dec 20178.11%–

Newest first. Scroll inside the table for earlier dates, back to 29 Dec 2017.

Frequently asked questions

How shorted is AXCELIS TECHNOLOGIES INC right now?
4.65% of AXCELIS TECHNOLOGIES INC's (ACLS) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 1,798th 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 ACLS'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 ACLS's days to cover?
4.48 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.