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HowShorted

How shorted is Fastly, Inc.? FSLY

#372most shorted US stockof 3,805 ranked stocks, more shorted than 90%

13.54%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.85
5 reports (~10 weeks)
−2.66
days to cover
3.95
Aggregate net short position time series for Fastly, 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 Fastly, 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
5 Aug 202614.18% 31 Jul 202613.46% 14 Aug 2026−0.72
6 May 202612.10% 30 Apr 202613.59% 15 May 2026+1.49
11 Feb 20269.31% 30 Jan 202611.26% 13 Feb 2026+1.95
5 Nov 20257.15% 31 Oct 20256.68% 14 Nov 2025−0.47
6 Aug 20256.60% 31 Jul 20256.44% 15 Aug 2025−0.16
7 May 20256.80% 30 Apr 20257.20% 15 May 2025+0.40
12 Feb 20256.64% 31 Jan 20257.67% 14 Feb 2025+1.03
6 Nov 20248.44% 31 Oct 20247.27% 15 Nov 2024−1.17

Fails to deliver

The SEC's fails-to-deliver figure for FSLY: 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.

Latest balance
200
14 Sep 2026
Highest in window
167,525
23 Mar 2026
Days with a balance
76
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Fastly, 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 168K shares.

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Sector: Technology

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202613.54%+0.85
31 Aug 202612.69%−0.77
14 Aug 202613.46%−0.72
31 Jul 202614.18%−2.13
15 Jul 202616.31%+0.11
30 Jun 202616.20%+4.27
15 Jun 202611.93%−0.64
29 May 202612.57%−1.02
15 May 202613.59%+1.49
30 Apr 202612.10%−0.82
15 Apr 202612.92%+0.83
31 Mar 202612.09%+0.33
13 Mar 202611.76%+1.19
27 Feb 202610.57%−0.69
13 Feb 202611.26%+1.95
30 Jan 20269.31%−0.43
15 Jan 20269.74%+1.23
31 Dec 20258.51%+0.13
15 Dec 20258.38%+2.06
28 Nov 20256.32%−0.36
14 Nov 20256.68%−0.47
31 Oct 20257.15%+0.09
15 Oct 20257.06%−0.46
30 Sep 20257.52%+1.46
15 Sep 20256.06%+0.09
29 Aug 20255.97%−0.47
15 Aug 20256.44%−0.16
31 Jul 20256.60%+0.28
15 Jul 20256.32%+0.27
30 Jun 20256.05%−0.84
13 Jun 20256.89%−0.11
30 May 20257.00%−0.20
15 May 20257.20%+0.40
30 Apr 20256.80%−0.04
15 Apr 20256.84%−0.47
31 Mar 20257.31%−0.09
14 Mar 20257.40%+0.07
28 Feb 20257.33%−0.34
14 Feb 20257.67%+1.03
31 Jan 20256.64%−0.51
15 Jan 20257.15%+0.55
31 Dec 20246.60%−0.61
13 Dec 20247.21%+0.15
29 Nov 20247.06%−0.21
15 Nov 20247.27%−1.17
31 Oct 20248.44%−0.48
15 Oct 20248.92%−1.46
30 Sep 202410.38%−0.24
13 Sep 202410.62%+0.31
30 Aug 202410.31%−0.81
15 Aug 202411.12%−0.85
31 Jul 202411.97%+0.06
15 Jul 202411.91%+0.12
28 Jun 202411.79%−0.17
14 Jun 202411.96%+1.77
31 May 202410.19%−0.33
15 May 202410.52%+1.34
30 Apr 20249.18%+0.40
15 Apr 20248.78%+0.99
28 Mar 20247.79%+0.96
15 Mar 20246.83%+0.46
29 Feb 20246.37%+0.34
15 Feb 20246.03%−0.02
31 Jan 20246.05%+0.40
12 Jan 20245.65%−0.70
29 Dec 20236.35%+0.25
15 Dec 20236.10%−1.00
30 Nov 20237.10%−0.46
15 Nov 20237.56%−0.02
31 Oct 20237.58%−1.05
13 Oct 20238.63%−1.26
29 Sep 20239.89%−1.01
15 Sep 202310.90%+0.06
31 Aug 202310.84%+0.43
15 Aug 202310.41%+1.58
31 Jul 20238.83%−0.31
14 Jul 20239.14%+0.41
30 Jun 20238.73%−0.30
15 Jun 20239.03%−0.67
31 May 20239.70%+0.10
15 May 20239.60%−0.58
28 Apr 202310.18%−0.95
14 Apr 202311.13%+1.08
31 Mar 202310.05%−1.07
15 Mar 202311.12%+0.50
28 Feb 202310.62%+0.15
15 Feb 202310.47%+1.03
31 Jan 20239.44%−0.17
13 Jan 20239.61%+0.57
30 Dec 20229.04%+0.32
15 Dec 20228.72%−0.33
30 Nov 20229.05%+0.34
15 Nov 20228.71%−0.94
31 Oct 20229.65%0.00
14 Oct 20229.65%−1.42
30 Sep 202211.07%+0.30
15 Sep 202210.77%+0.04
31 Aug 202210.73%+1.95
15 Aug 20228.78%−1.56
29 Jul 202210.34%−0.35
15 Jul 202210.69%−1.23
30 Jun 202211.92%+0.27
15 Jun 202211.65%−0.12
31 May 202211.77%−1.60
13 May 202213.37%+1.80
29 Apr 202211.57%−0.05
14 Apr 202211.62%−0.34
31 Mar 202211.96%+0.16
15 Mar 202211.80%+1.21
28 Feb 202210.59%+1.78
15 Feb 20228.81%−2.81
31 Jan 202211.62%−0.20
14 Jan 202211.82%−0.54
31 Dec 202112.36%−0.41
15 Dec 202112.77%−0.22
30 Nov 202112.99%+0.25
15 Nov 202112.74%−0.63
29 Oct 202113.37%−1.00
15 Oct 202114.37%+0.05
30 Sep 202114.32%+0.27
15 Sep 202114.05%−0.44
31 Aug 202114.49%−1.65
13 Aug 202116.14%−2.36
30 Jul 202118.50%–

Newest first. Scroll inside the table for earlier dates, back to 30 Jul 2021.

Frequently asked questions

How shorted is Fastly, Inc. right now?
13.54% of Fastly, Inc.'s (FSLY) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 372nd 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 FSLY'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 FSLY's days to cover?
3.95 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.