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HowShorted

How shorted is Amprius Technologies, Inc.? AMPX

#271most shorted US stockof 3,805 ranked stocks, more shorted than 92%

15.53%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.32
5 reports (~10 weeks)
−3.05
days to cover
5.08
Aggregate net short position time series for Amprius 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 Amprius 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
4 Aug 202616.38% 31 Jul 202615.16% 14 Aug 2026−1.22
6 May 202617.80% 30 Apr 202616.02% 15 May 2026−1.78
4 Mar 202614.67% 27 Feb 202613.68% 13 Mar 2026−0.99
6 Nov 202511.77% 31 Oct 202512.31% 14 Nov 2025+0.54
7 Aug 20257.82% 31 Jul 20258.05% 15 Aug 2025+0.23
8 May 20254.71% 30 Apr 20254.50% 15 May 2025−0.21
20 Mar 20253.18% 14 Mar 20255.87% 31 Mar 2025+2.69
4 Mar 20253.90% 28 Feb 20253.18% 14 Mar 2025−0.72

Fails to deliver

The SEC's fails-to-deliver figure for AMPX: 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
2,421
11 Sep 2026
Highest in window
1,179,933
2 Apr 2026
Days with a balance
81
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Amprius 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 1.2M shares.

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Sector: Technology

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202615.53%−0.32
31 Aug 202615.85%+0.69
14 Aug 202615.16%−1.22
31 Jul 202616.38%−3.41
15 Jul 202619.79%+1.21
30 Jun 202618.58%+2.47
15 Jun 202616.11%−1.99
29 May 202618.10%+2.08
15 May 202616.02%−1.78
30 Apr 202617.80%+1.28
15 Apr 202616.52%+2.79
31 Mar 202613.73%+0.05
13 Mar 202613.68%−0.99
27 Feb 202614.67%+1.61
13 Feb 202613.06%−0.44
30 Jan 202613.50%+0.28
15 Jan 202613.22%+0.74
31 Dec 202512.48%+2.29
15 Dec 202510.19%−0.17
28 Nov 202510.36%−1.95
14 Nov 202512.31%+0.54
31 Oct 202511.77%−1.70
15 Oct 202513.47%−0.94
30 Sep 202514.41%+3.50
15 Sep 202510.91%+1.75
29 Aug 20259.16%+1.11
15 Aug 20258.05%+0.23
31 Jul 20257.82%+1.67
15 Jul 20256.15%+2.13
30 Jun 20254.02%−0.54
13 Jun 20254.56%−0.41
30 May 20254.97%+0.47
15 May 20254.50%−0.21
30 Apr 20254.71%−0.06
15 Apr 20254.77%−1.10
31 Mar 20255.87%+2.69
14 Mar 20253.18%−0.72
28 Feb 20253.90%−0.34
14 Feb 20254.24%+0.48
31 Jan 20253.76%+1.12
15 Jan 20252.64%−0.12
31 Dec 20242.76%−0.70
13 Dec 20243.46%+0.19
29 Nov 20243.27%+0.12
15 Nov 20243.15%−1.38
31 Oct 20244.53%+1.49
15 Oct 20243.04%+0.54
30 Sep 20242.50%+0.18
13 Sep 20242.32%+0.10
30 Aug 20242.22%+0.17
15 Aug 20242.05%+0.47
31 Jul 20241.58%−1.55
14 Jun 20243.13%−2.09
31 May 20245.22%+1.22
15 May 20244.00%+2.00
30 Apr 20242.00%+0.45
15 Apr 20241.55%−0.19
28 Mar 20241.74%+0.01
15 Mar 20241.73%+0.29
29 Feb 20241.44%+0.29
15 Feb 20241.15%+0.27
31 Jan 20240.88%0.00
12 Jan 20240.88%−0.03
29 Dec 20230.91%−0.09
15 Dec 20231.00%−0.32
30 Nov 20231.32%−0.03
15 Nov 20231.35%+0.07
31 Oct 20231.28%−0.16
13 Oct 20231.44%+0.05
29 Sep 20231.39%−0.57
15 Sep 20231.96%+0.69
31 Aug 20231.27%+0.10
15 Aug 20231.17%−0.20
31 Jul 20231.37%−0.16
14 Jul 20231.53%+0.35
30 Jun 20231.18%+0.14
15 Jun 20231.04%+0.41
31 May 20230.63%−0.14
15 May 20230.77%+0.06
28 Apr 20230.71%+0.04
14 Apr 20230.67%−0.02
31 Mar 20230.69%+0.45
15 Mar 20230.24%−0.03
28 Feb 20230.27%−0.02
15 Feb 20230.29%+0.01
31 Jan 20230.28%−0.29
13 Jan 20230.57%−0.03
30 Dec 20220.60%−0.03
15 Dec 20220.63%+0.02
30 Nov 20220.61%−0.03
15 Nov 20220.64%–

Newest first. Scroll inside the table for earlier dates, back to 15 Nov 2022.

Frequently asked questions

How shorted is Amprius Technologies, Inc. right now?
15.53% of Amprius Technologies, Inc.'s (AMPX) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 271st 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 AMPX'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 AMPX's days to cover?
5.08 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.