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HowShorted

How shorted is Ambarella, Inc.? AMBA

#418most shorted US stockof 3,805 ranked stocks, more shorted than 89%

12.93%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+3.04
5 reports (~10 weeks)
+5.42
days to cover
2.25
Aggregate net short position time series for Ambarella, 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 Ambarella, 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
3 Sep 20269.89% 31 Aug 202612.93% 15 Sep 2026+3.04
28 May 20265.50% 15 May 20265.05% 29 May 2026−0.45
26 Feb 20264.70% 13 Feb 20264.60% 27 Feb 2026−0.10
25 Nov 20254.52% 14 Nov 20256.53% 28 Nov 2025+2.01
28 Aug 20255.20% 15 Aug 20254.88% 29 Aug 2025−0.32
29 May 20253.04% 15 May 20253.48% 30 May 2025+0.44
26 Feb 20254.52% 14 Feb 20254.67% 28 Feb 2025+0.15
26 Nov 20243.45% 15 Nov 20243.72% 29 Nov 2024+0.27

Fails to deliver

The SEC's fails-to-deliver figure for AMBA: 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
230
4 Sep 2026
Highest in window
35,775
12 Nov 2025
Days with a balance
55
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Ambarella, 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 36K shares.

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Sector: Technology · By year: 2018 · 2019 · 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202612.93%+3.04
31 Aug 20269.89%+0.61
14 Aug 20269.28%−2.47
31 Jul 202611.75%+2.76
15 Jul 20268.99%+1.48
30 Jun 20267.51%+0.97
15 Jun 20266.54%+1.49
29 May 20265.05%−0.45
15 May 20265.50%−0.50
30 Apr 20266.00%+0.16
15 Apr 20265.84%+1.05
31 Mar 20264.79%−0.41
13 Mar 20265.20%+0.60
27 Feb 20264.60%−0.10
13 Feb 20264.70%−0.58
30 Jan 20265.28%−0.13
15 Jan 20265.41%+0.29
31 Dec 20255.12%−0.42
15 Dec 20255.54%−0.99
28 Nov 20256.53%+2.01
14 Nov 20254.52%+0.52
31 Oct 20254.00%−0.31
15 Oct 20254.31%−0.38
30 Sep 20254.69%+0.07
15 Sep 20254.62%−0.26
29 Aug 20254.88%−0.32
15 Aug 20255.20%+0.08
31 Jul 20255.12%+0.24
15 Jul 20254.88%−0.19
30 Jun 20255.07%+1.44
13 Jun 20253.63%+0.15
30 May 20253.48%+0.44
15 May 20253.04%−0.16
30 Apr 20253.20%+0.02
15 Apr 20253.18%−0.67
31 Mar 20253.85%+0.55
14 Mar 20253.30%−1.37
28 Feb 20254.67%+0.15
14 Feb 20254.52%+0.79
31 Jan 20253.73%+0.16
15 Jan 20253.57%+0.20
31 Dec 20243.37%−0.07
13 Dec 20243.44%−0.28
29 Nov 20243.72%+0.27
15 Nov 20243.45%+0.19
31 Oct 20243.26%−0.07
15 Oct 20243.33%−0.33
30 Sep 20243.66%−0.07
13 Sep 20243.73%+0.09
30 Aug 20243.64%−1.06
15 Aug 20244.70%+0.28
31 Jul 20244.42%+0.68
15 Jul 20243.74%−2.00
28 Jun 20245.74%+0.36
14 Jun 20245.38%−0.38
31 May 20245.76%−0.85
15 May 20246.61%−0.41
30 Apr 20247.02%+0.99
15 Apr 20246.03%−0.01
28 Mar 20246.04%−0.58
15 Mar 20246.62%−0.78
29 Feb 20247.40%−0.29
15 Feb 20247.69%+0.84
31 Jan 20246.85%+1.05
12 Jan 20245.80%+2.14
29 Dec 20233.66%+0.09
15 Dec 20233.57%+1.01
30 Nov 20232.56%−0.11
15 Nov 20232.67%−0.07
31 Oct 20232.74%−0.01
13 Oct 20232.75%−0.02
29 Sep 20232.77%−0.07
15 Sep 20232.84%−0.52
31 Aug 20233.36%+0.32
15 Aug 20233.04%−0.35
31 Jul 20233.39%+0.51
14 Jul 20232.88%−0.20
30 Jun 20233.08%−0.15
15 Jun 20233.23%+0.05
31 May 20233.18%−0.32
15 May 20233.50%+0.46
28 Apr 20233.04%−0.07
14 Apr 20233.11%+0.27
31 Mar 20232.84%+0.04
15 Mar 20232.80%−0.16
28 Feb 20232.96%+0.07
15 Feb 20232.89%−0.15
31 Jan 20233.04%−0.45
13 Jan 20233.49%−0.43
30 Dec 20223.92%+0.07
15 Dec 20223.85%+0.85
30 Nov 20223.00%+0.77
15 Nov 20222.23%−0.44
31 Oct 20222.67%−0.17
14 Oct 20222.84%−0.07
30 Sep 20222.91%−0.42
15 Sep 20223.33%−0.19
31 Aug 20223.52%−0.53
15 Aug 20224.05%+0.14
29 Jul 20223.91%+0.05
15 Jul 20223.86%−0.03
30 Jun 20223.89%+0.23
15 Jun 20223.66%−0.26
31 May 20223.92%+0.04
13 May 20223.88%+0.07
29 Apr 20223.81%+0.41
14 Apr 20223.40%−0.33
31 Mar 20223.73%+0.36
15 Mar 20223.37%+1.09
28 Feb 20222.28%−0.66
15 Feb 20222.94%−0.30
31 Jan 20223.24%+0.26
14 Jan 20222.98%−0.28
31 Dec 20213.26%−1.02
15 Dec 20214.28%+0.90
30 Nov 20213.38%−0.30
15 Nov 20213.68%−0.65
29 Oct 20214.33%+0.39
15 Oct 20213.94%−0.15
30 Sep 20214.09%−0.64
15 Sep 20214.73%+0.94
31 Aug 20213.79%+0.29
13 Aug 20213.50%−0.48
30 Jul 20213.98%+0.16
15 Jul 20213.82%−0.14
30 Jun 20213.96%−0.16
15 Jun 20214.12%−0.38
28 May 20214.50%+0.33
14 May 20214.17%−0.17
30 Apr 20214.34%−0.11
15 Apr 20214.45%−0.66
31 Mar 20215.11%−1.15
15 Mar 20216.26%+0.52
26 Feb 20215.74%−0.33
12 Feb 20216.07%+0.06
29 Jan 20216.01%−0.01
15 Jan 20216.02%−0.02
31 Dec 20206.04%−0.57
15 Dec 20206.61%−3.84
30 Nov 202010.45%+2.18
13 Nov 20208.27%+0.50
30 Oct 20207.77%+0.41
15 Oct 20207.36%−0.09
30 Sep 20207.45%−1.08
15 Sep 20208.53%+0.31
31 Aug 20208.22%+0.73
14 Aug 20207.49%+0.24
31 Jul 20207.25%−0.10
15 Jul 20207.35%+0.22
30 Jun 20207.13%+0.05
15 Jun 20207.08%−0.43
29 May 20207.51%+0.11
15 May 20207.40%+1.49
30 Apr 20205.91%+0.09
15 Apr 20205.82%+0.25
31 Mar 20205.57%−0.44
13 Mar 20206.01%−1.57
28 Feb 20207.58%−0.95
14 Feb 20208.53%+0.22
31 Jan 20208.31%−0.71
15 Jan 20209.02%−0.04
31 Dec 20199.06%+0.50
13 Dec 20198.56%−1.06
29 Nov 20199.62%−0.29
15 Nov 20199.91%−2.22
31 Oct 201912.13%+0.37
15 Oct 201911.76%−0.44
30 Sep 201912.20%−0.64
13 Sep 201912.84%+0.06
30 Aug 201912.78%+0.33
15 Aug 201912.45%−0.57
31 Jul 201913.02%−0.25
15 Jul 201913.27%−0.46
28 Jun 201913.73%−0.45
14 Jun 201914.18%+0.10
31 May 201914.08%−0.79
15 May 201914.87%−0.44
30 Apr 201915.31%−0.67
15 Apr 201915.98%−0.26
29 Mar 201916.24%−1.02
15 Mar 201917.26%+0.58
28 Feb 201916.68%−0.11
15 Feb 201916.79%−0.11
31 Jan 201916.90%+0.60
15 Jan 201916.30%−0.40
31 Dec 201816.70%−0.04
14 Dec 201816.74%−1.11
30 Nov 201817.85%−3.05
15 Nov 201820.90%−0.71
31 Oct 201821.61%−2.12
15 Oct 201823.73%−1.97
28 Sep 201825.70%+1.37
14 Sep 201824.33%+3.20
31 Aug 201821.13%+0.09
15 Aug 201821.04%+0.03
31 Jul 201821.01%+2.90
13 Jul 201818.11%+1.12
29 Jun 201816.99%−0.33
15 Jun 201817.32%+3.07
31 May 201814.25%−0.48
15 May 201814.73%+0.29
30 Apr 201814.44%+0.33
13 Apr 201814.11%+0.40
29 Mar 201813.71%−1.04
15 Mar 201814.75%+2.06
28 Feb 201812.69%−0.17
15 Feb 201812.86%+0.25
31 Jan 201812.61%−3.13
12 Jan 201815.74%+0.82
29 Dec 201714.92%–

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

Frequently asked questions

How shorted is Ambarella, Inc. right now?
12.93% of Ambarella, Inc.'s (AMBA) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 418th 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 AMBA'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 AMBA's days to cover?
2.25 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.