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HowShorted

How shorted is Onto Innovation Inc.? ONTO

#1,499most shorted US stockof 3,805 ranked stocks, more shorted than 60%

5.58%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.56
5 reports (~10 weeks)
+0.30
days to cover
2.94
Aggregate net short position time series for Onto Innovation 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 Onto Innovation 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 20265.39% 31 Jul 20265.21% 14 Aug 2026−0.18
5 May 20262.03% 30 Apr 20262.20% 15 May 2026+0.17
16 Apr 20262.38% 15 Apr 20262.03% 30 Apr 2026−0.35
19 Feb 20262.02% 13 Feb 20262.34% 27 Feb 2026+0.32
6 Nov 20253.26% 31 Oct 20253.58% 14 Nov 2025+0.32
7 Aug 20254.33% 31 Jul 20254.09% 15 Aug 2025−0.24
8 May 20253.97% 30 Apr 20253.85% 15 May 2025−0.12
6 Feb 20252.88% 31 Jan 20252.48% 14 Feb 2025−0.40

Fails to deliver

The SEC's fails-to-deliver figure for ONTO: 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.

Latest balance
437
14 Sep 2026
Highest in window
1,602,485
29 Jun 2026
Days with a balance
64
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Onto Innovation 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 1.6M shares.

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Sector: Technology

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20265.58%+0.56
31 Aug 20265.02%−0.19
14 Aug 20265.21%−0.18
31 Jul 20265.39%−0.01
15 Jul 20265.40%+0.12
30 Jun 20265.28%+0.11
15 Jun 20265.17%+1.24
29 May 20263.93%+1.73
15 May 20262.20%+0.17
30 Apr 20262.03%−0.35
15 Apr 20262.38%−0.32
31 Mar 20262.70%+0.81
13 Mar 20261.89%−0.45
27 Feb 20262.34%+0.32
13 Feb 20262.02%−0.15
30 Jan 20262.17%−0.52
15 Jan 20262.69%+0.05
31 Dec 20252.64%−0.83
15 Dec 20253.47%−0.56
28 Nov 20254.03%+0.45
14 Nov 20253.58%+0.32
31 Oct 20253.26%−0.68
15 Oct 20253.94%−0.90
30 Sep 20254.84%+0.36
15 Sep 20254.48%+0.28
29 Aug 20254.20%+0.11
15 Aug 20254.09%−0.24
31 Jul 20254.33%+0.13
15 Jul 20254.20%−0.17
30 Jun 20254.37%+0.53
13 Jun 20253.84%+0.42
30 May 20253.42%−0.43
15 May 20253.85%−0.12
30 Apr 20253.97%−0.27
15 Apr 20254.24%+1.19
31 Mar 20253.05%+0.62
14 Mar 20252.43%−0.63
28 Feb 20253.06%+0.58
14 Feb 20252.48%−0.40
31 Jan 20252.88%+0.46
15 Jan 20252.42%+0.07
31 Dec 20242.35%+0.55
13 Dec 20241.80%−0.15
29 Nov 20241.95%−0.11
15 Nov 20242.06%−0.14
31 Oct 20242.20%−0.37
15 Oct 20242.57%−0.17
30 Sep 20242.74%+0.77
13 Sep 20241.97%+0.33
30 Aug 20241.64%+0.20
15 Aug 20241.44%0.00
31 Jul 20241.44%−0.22
15 Jul 20241.66%−1.36
28 Jun 20243.02%−0.30
14 Jun 20243.32%+0.22
31 May 20243.10%−0.54
15 May 20243.64%+0.09
30 Apr 20243.55%+0.44
15 Apr 20243.11%+0.55
28 Mar 20242.56%−0.17
15 Mar 20242.73%−0.19
29 Feb 20242.92%+0.10
15 Feb 20242.82%−0.25
31 Jan 20243.07%+0.26
12 Jan 20242.81%−0.44
29 Dec 20233.25%−0.11
15 Dec 20233.36%+0.18
30 Nov 20233.18%−0.15
15 Nov 20233.33%−0.21
31 Oct 20233.54%−0.38
13 Oct 20233.92%+0.05
29 Sep 20233.87%+0.35
15 Sep 20233.52%+0.44
31 Aug 20233.08%+0.38
15 Aug 20232.70%+0.61
31 Jul 20232.09%+0.13
14 Jul 20231.96%0.00
30 Jun 20231.96%−0.55
15 Jun 20232.51%−0.01
31 May 20232.52%+0.03
15 May 20232.49%+0.19
28 Apr 20232.30%+0.17
14 Apr 20232.13%+0.12
31 Mar 20232.01%+0.06
15 Mar 20231.95%+0.20
28 Feb 20231.75%+0.13
15 Feb 20231.62%−0.08
31 Jan 20231.70%−0.08
13 Jan 20231.78%+0.08
30 Dec 20221.70%+0.10
15 Dec 20221.60%−0.31
30 Nov 20221.91%−0.35
15 Nov 20222.26%−0.03
31 Oct 20222.29%+0.02
14 Oct 20222.27%+0.33
30 Sep 20221.94%−0.09
15 Sep 20222.03%+0.24
31 Aug 20221.79%0.00
15 Aug 20221.79%−0.48
29 Jul 20222.27%−0.01
15 Jul 20222.28%−0.06
30 Jun 20222.34%−0.21
15 Jun 20222.55%+0.19
31 May 20222.36%+0.64
13 May 20221.72%−0.04
29 Apr 20221.76%+0.15
14 Apr 20221.61%−0.83
31 Mar 20222.44%+0.27
15 Mar 20222.17%+0.14
28 Feb 20222.03%+0.03
15 Feb 20222.00%−0.14
31 Jan 20222.14%+0.38
14 Jan 20221.76%−0.17
31 Dec 20211.93%+0.03
15 Dec 20211.90%+0.03
30 Nov 20211.87%0.00
15 Nov 20211.87%−0.39
29 Oct 20212.26%−0.16
15 Oct 20212.42%−0.23
30 Sep 20212.65%+0.03
15 Sep 20212.62%−0.18
31 Aug 20212.80%−0.24
13 Aug 20213.04%+0.36
30 Jul 20212.68%−0.12
15 Jul 20212.80%−0.18
30 Jun 20212.98%−0.19
15 Jun 20213.17%+0.15
28 May 20213.02%+0.27
14 May 20212.75%+0.39
30 Apr 20212.36%−0.37
15 Apr 20212.73%−0.17
31 Mar 20212.90%+0.23
15 Mar 20212.67%−0.02
26 Feb 20212.69%−0.17
12 Feb 20212.86%−0.45
29 Jan 20213.31%−0.17
15 Jan 20213.48%−0.02
31 Dec 20203.50%−0.07
15 Dec 20203.57%+0.10
30 Nov 20203.47%+0.18
13 Nov 20203.29%−0.17
30 Oct 20203.46%−0.69
15 Oct 20204.15%−0.09
30 Sep 20204.24%−0.15
15 Sep 20204.39%+0.13
31 Aug 20204.26%+0.05
14 Aug 20204.21%−0.53
31 Jul 20204.74%−0.66
15 Jul 20205.40%−0.44
30 Jun 20205.84%−0.07
15 Jun 20205.91%+0.29
29 May 20205.62%+0.49
15 May 20205.13%−1.00
30 Apr 20206.13%−0.21
15 Apr 20206.34%+0.72
31 Mar 20205.62%+1.96
13 Mar 20203.66%+0.09
28 Feb 20203.57%+0.04
14 Feb 20203.53%−0.04
31 Jan 20203.57%−0.07
15 Jan 20203.64%−5.30
15 Oct 20198.94%+0.56
30 Sep 20198.38%+1.09
13 Sep 20197.29%−0.73
30 Aug 20198.02%−0.26
15 Aug 20198.28%+0.47
31 Jul 20197.81%−1.30
15 Jul 20199.11%+1.04
28 Jun 20198.07%+0.63
14 Jun 20197.44%+0.58
31 May 20196.86%−0.71
15 May 20197.57%+0.39
30 Apr 20197.18%−0.49
15 Apr 20197.67%−0.14
29 Mar 20197.81%−0.92
15 Mar 20198.73%+0.69
28 Feb 20198.04%−0.28
15 Feb 20198.32%−0.13
31 Jan 20198.45%+0.33
15 Jan 20198.12%+0.45
31 Dec 20187.67%+0.26
14 Dec 20187.41%−0.19
30 Nov 20187.60%+0.29
15 Nov 20187.31%+0.43
31 Oct 20186.88%+0.94
15 Oct 20185.94%+0.94
28 Sep 20185.00%−0.54
14 Sep 20185.54%−0.60
31 Aug 20186.14%−0.38
15 Aug 20186.52%+0.94
31 Jul 20185.58%−0.98
13 Jul 20186.56%+0.56
29 Jun 20186.00%+0.96
15 Jun 20185.04%+2.30
31 May 20182.74%−0.07
15 May 20182.81%−0.72
30 Apr 20183.53%+0.21
13 Apr 20183.32%−0.20
29 Mar 20183.52%−0.23
15 Mar 20183.75%+0.18
28 Feb 20183.57%−0.36
15 Feb 20183.93%+0.96
31 Jan 20182.97%+0.45
12 Jan 20182.52%−0.01
29 Dec 20172.53%–

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

Frequently asked questions

How shorted is Onto Innovation Inc. right now?
5.58% of Onto Innovation Inc.'s (ONTO) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 1,499th 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 ONTO'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 ONTO's days to cover?
2.94 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.