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HowShorted

How shorted is Amylyx Pharmaceuticals, Inc.? AMLX

#481most shorted US stockof 3,805 ranked stocks, more shorted than 87%

12.13%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.70
5 reports (~10 weeks)
−0.81
days to cover
8.64
Aggregate net short position time series for Amylyx Pharmaceuticals, 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 Amylyx Pharmaceuticals, 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 202612.03% 31 Jul 202612.05% 14 Aug 2026+0.02
7 May 202613.31% 30 Apr 202613.05% 15 May 2026−0.26
3 Mar 202613.20% 27 Feb 202612.62% 13 Mar 2026−0.58
6 Nov 20259.52% 31 Oct 202510.85% 14 Nov 2025+1.33
7 Aug 20258.07% 31 Jul 20258.34% 15 Aug 2025+0.27
8 May 20254.71% 30 Apr 20255.58% 15 May 2025+0.87
4 Mar 20255.33% 28 Feb 20255.47% 14 Mar 2025+0.14
7 Nov 20241.88% 31 Oct 20242.23% 15 Nov 2024+0.35

Fails to deliver

The SEC's fails-to-deliver figure for AMLX: 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
1
31 Aug 2026
Highest in window
175,336
14 Oct 2025
Days with a balance
46
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Amylyx Pharmaceuticals, 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 175K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202612.13%+0.70
31 Aug 202611.43%−0.62
14 Aug 202612.05%+0.02
31 Jul 202612.03%+1.00
15 Jul 202611.03%−1.91
30 Jun 202612.94%+1.14
15 Jun 202611.80%−1.65
29 May 202613.45%+0.40
15 May 202613.05%−0.26
30 Apr 202613.31%−0.20
15 Apr 202613.51%+0.55
31 Mar 202612.96%+0.34
13 Mar 202612.62%−0.58
27 Feb 202613.20%+0.17
13 Feb 202613.03%+0.51
30 Jan 202612.52%+0.28
15 Jan 202612.24%−0.18
31 Dec 202512.42%+1.43
15 Dec 202510.99%+0.41
28 Nov 202510.58%−0.27
14 Nov 202510.85%+1.33
31 Oct 20259.52%−1.26
15 Oct 202510.78%−0.51
30 Sep 202511.29%+1.45
15 Sep 20259.84%+0.41
29 Aug 20259.43%+1.09
15 Aug 20258.34%+0.27
31 Jul 20258.07%−0.31
15 Jul 20258.38%+0.95
30 Jun 20257.43%+2.90
13 Jun 20254.53%−0.11
30 May 20254.64%−0.94
15 May 20255.58%+0.87
30 Apr 20254.71%−1.58
15 Apr 20256.29%+0.78
31 Mar 20255.51%+0.04
14 Mar 20255.47%+0.14
28 Feb 20255.33%+0.40
14 Feb 20254.93%+1.15
31 Jan 20253.78%+0.16
15 Jan 20253.62%+0.79
31 Dec 20242.83%+0.55
13 Dec 20242.28%+0.17
29 Nov 20242.11%−0.12
15 Nov 20242.23%+0.35
31 Oct 20241.88%+0.40
15 Oct 20241.48%−0.40
30 Sep 20241.88%+0.03
13 Sep 20241.85%−0.33
30 Aug 20242.18%−0.72
15 Aug 20242.90%+0.17
31 Jul 20242.73%−2.83
15 Jul 20245.56%−1.16
28 Jun 20246.72%−3.89
14 Jun 202410.61%−0.52
31 May 202411.13%−0.62
15 May 202411.75%−0.77
30 Apr 202412.52%+2.91
15 Apr 20249.61%+0.75
28 Mar 20248.86%+1.35
15 Mar 20247.51%+1.07
29 Feb 20246.44%−0.91
15 Feb 20247.35%−0.71
31 Jan 20248.06%−0.42
12 Jan 20248.48%+0.42
29 Dec 20238.06%−1.80
15 Dec 20239.86%−0.42
30 Nov 202310.28%−0.19
15 Nov 202310.47%−1.30
31 Oct 202311.77%−2.72
13 Oct 202314.49%+1.49
29 Sep 202313.00%−0.27
15 Sep 202313.27%+0.54
31 Aug 202312.73%−0.04
15 Aug 202312.77%+0.04
31 Jul 202312.73%+0.27
14 Jul 202312.46%−1.31
30 Jun 202313.77%−0.11
15 Jun 202313.88%+0.69
31 May 202313.19%+0.41
15 May 202312.78%+2.48
28 Apr 202310.30%+1.16
14 Apr 20239.14%−0.44
31 Mar 20239.58%+0.80
15 Mar 20238.78%+0.53
28 Feb 20238.25%−0.53
15 Feb 20238.78%+0.12
31 Jan 20238.66%+0.13
13 Jan 20238.53%+0.02
30 Dec 20228.51%+1.41
15 Dec 20227.10%−0.16
30 Nov 20227.26%−0.66
15 Nov 20227.92%−1.23
31 Oct 20229.15%−2.29
14 Oct 202211.44%+1.53
30 Sep 20229.91%+3.62
15 Sep 20226.29%+0.33
31 Aug 20225.96%+0.15
15 Aug 20225.81%+0.17
29 Jul 20225.64%−0.62
15 Jul 20226.26%+0.84
30 Jun 20225.42%+0.51
15 Jun 20224.91%+0.10
31 May 20224.81%+0.36
13 May 20224.45%–

Newest first. Scroll inside the table for earlier dates, back to 13 May 2022.

Frequently asked questions

How shorted is Amylyx Pharmaceuticals, Inc. right now?
12.13% of Amylyx Pharmaceuticals, Inc.'s (AMLX) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 481st 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 AMLX'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 AMLX's days to cover?
8.64 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.