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HowShorted

How shorted is Alumis Inc.? ALMS

#1,696most shorted US stockof 3,805 ranked stocks, more shorted than 55%

4.94%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.51
5 reports (~10 weeks)
−6.27
days to cover
1.00
Aggregate net short position time series for Alumis 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 Alumis 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 Aug 20264.52% 31 Jul 20264.59% 14 Aug 2026+0.07
14 May 20268.87% 30 Apr 20268.91% 15 May 2026+0.04
19 Mar 20267.05% 13 Mar 20268.83% 31 Mar 2026+1.78
9 Jan 20264.30% 31 Dec 20258.31% 15 Jan 2026+4.01
13 Nov 20252.70% 31 Oct 20253.38% 14 Nov 2025+0.68
13 Aug 20255.31% 31 Jul 20251.78% 15 Aug 2025−3.53
14 May 20256.50% 30 Apr 20258.52% 15 May 2025+2.02
19 Mar 20255.61% 14 Mar 20257.52% 31 Mar 2025+1.91

Fails to deliver

The SEC's fails-to-deliver figure for ALMS: 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
291,588
8 Sep 2026
Highest in window
1,219,882
7 Jan 2026
Days with a balance
67
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Alumis 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: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20264.94%+0.51
31 Aug 20264.43%−0.16
14 Aug 20264.59%+0.07
31 Jul 20264.52%−0.79
15 Jul 20265.31%−5.90
30 Jun 202611.21%+1.28
15 Jun 20269.93%+1.25
29 May 20268.68%−0.23
15 May 20268.91%+0.04
30 Apr 20268.87%−0.73
15 Apr 20269.60%+0.77
31 Mar 20268.83%+1.78
13 Mar 20267.05%−0.57
27 Feb 20267.62%−1.05
13 Feb 20268.67%+0.36
30 Jan 20268.31%0.00
15 Jan 20268.31%+4.01
31 Dec 20254.30%+0.59
15 Dec 20253.71%+0.32
28 Nov 20253.39%+0.01
14 Nov 20253.38%+0.68
31 Oct 20252.70%+0.67
15 Oct 20252.03%−0.71
30 Sep 20252.74%+0.47
15 Sep 20252.27%+0.31
29 Aug 20251.96%+0.18
15 Aug 20251.78%−3.53
31 Jul 20255.31%−0.62
15 Jul 20255.93%−1.48
30 Jun 20257.41%+1.49
13 Jun 20255.92%−0.85
30 May 20256.77%−1.75
15 May 20258.52%+2.02
30 Apr 20256.50%+0.77
15 Apr 20255.73%−1.79
31 Mar 20257.52%+1.91
14 Mar 20255.61%+0.21
28 Feb 20255.40%+0.23
14 Feb 20255.17%+0.81
31 Jan 20254.36%−0.03
15 Jan 20254.39%−0.01
31 Dec 20244.40%−0.27
13 Dec 20244.67%+0.20
29 Nov 20244.47%+0.40
15 Nov 20244.07%+0.09
31 Oct 20243.98%−0.04
15 Oct 20244.02%+0.08
30 Sep 20243.94%+1.23
13 Sep 20242.71%+0.35
30 Aug 20242.36%+0.77
15 Aug 20241.59%–

Newest first. Scroll inside the table for earlier dates, back to 15 Aug 2024.

Frequently asked questions

How shorted is Alumis Inc. right now?
4.94% of Alumis Inc.'s (ALMS) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 1,696th 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 ALMS'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 ALMS's days to cover?
1.00 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.