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HowShorted

How shorted is Aeluma, Inc.? ALMU

#155most shorted US stockof 3,805 ranked stocks, more shorted than 95%

18.80%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−1.45
5 reports (~10 weeks)
−0.18
days to cover
8.86
Aggregate net short position time series for Aeluma, Inc.

Markers along the chart's base: â–² results announced (an 8-K reporting results was filed) â–² 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 Aeluma, 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
13 May 202619.96% 30 Apr 202617.35% 15 May 2026−2.61
11 Feb 202612.55% 30 Jan 202612.99% 13 Feb 2026+0.44
12 Nov 20256.81% 31 Oct 20258.28% 14 Nov 2025+1.47
7 May 20250.63% 30 Apr 20250.64% 15 May 2025+0.01

Fails to deliver

The SEC's fails-to-deliver figure for ALMU: 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
27
11 Sep 2026
Highest in window
65,735
30 Mar 2026
Days with a balance
93
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Aeluma, 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 66K shares.

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Sector: Technology · By year: 2025 · 2026

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202618.80%−1.45
31 Aug 202620.25%+0.62
14 Aug 202619.63%−1.30
31 Jul 202620.93%+1.37
15 Jul 202619.56%+0.58
30 Jun 202618.98%+2.39
15 Jun 202616.59%−0.53
29 May 202617.12%−0.23
15 May 202617.35%−2.61
30 Apr 202619.96%−0.45
15 Apr 202620.41%+3.20
31 Mar 202617.21%+2.71
13 Mar 202614.50%+1.96
27 Feb 202612.54%−0.45
13 Feb 202612.99%+0.44
30 Jan 202612.55%+2.98
15 Jan 20269.57%−1.34
31 Dec 202510.91%+1.92
15 Dec 20258.99%+0.20
28 Nov 20258.79%+0.51
14 Nov 20258.28%+1.47
31 Oct 20256.81%+0.89
15 Oct 20255.92%−1.03
30 Sep 20256.95%−0.96
15 Sep 20257.91%+6.47
13 Jun 20251.44%+0.37
30 May 20251.07%+0.43
15 May 20250.64%+0.01
30 Apr 20250.63%+0.01
15 Apr 20250.62%−0.30
31 Mar 20250.92%–

Newest first. Scroll inside the table for earlier dates, back to 31 Mar 2025.

Frequently asked questions

How shorted is Aeluma, Inc. right now?
18.80% of Aeluma, Inc.'s (ALMU) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 155th 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 ALMU'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 ALMU's days to cover?
8.86 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.