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HowShorted

How shorted is Fastenal Company? FAST

#2,420most shorted US stockof 3,805 ranked stocks, more shorted than 36%

3.11%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.09
5 reports (~10 weeks)
+0.42
days to cover
5.78
Aggregate net short position time series for Fastenal Company

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 Fastenal Company 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
14 Jul 20262.69% 30 Jun 20262.74% 15 Jul 2026+0.05
13 Apr 20262.40% 31 Mar 20262.11% 15 Apr 2026−0.29
20 Jan 20262.74% 15 Jan 20263.02% 30 Jan 2026+0.28
14 Oct 20252.25% 30 Sep 20252.07% 15 Oct 2025−0.18
11 Apr 20252.48% 31 Mar 20252.52% 15 Apr 2025+0.04
17 Jan 20252.14% 15 Jan 20252.29% 31 Jan 2025+0.15
11 Oct 20242.31% 30 Sep 20242.42% 15 Oct 2024+0.11
12 Jul 20242.51% 28 Jun 20242.79% 15 Jul 2024+0.28

Fails to deliver

The SEC's fails-to-deliver figure for FAST: 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
9
11 Sep 2026
Highest in window
345,402
26 Jan 2026
Days with a balance
75
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Fastenal Company 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 345K shares.

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Sector: Consumer retail

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20263.11%+0.09
31 Aug 20263.02%+0.30
14 Aug 20262.72%−0.41
31 Jul 20263.13%+0.39
15 Jul 20262.74%+0.05
30 Jun 20262.69%−0.04
15 Jun 20262.73%+0.25
29 May 20262.48%+0.03
15 May 20262.45%+0.31
30 Apr 20262.14%+0.03
15 Apr 20262.11%−0.29
31 Mar 20262.40%−0.31
13 Mar 20262.71%−0.07
27 Feb 20262.78%−0.11
13 Feb 20262.89%−0.13
30 Jan 20263.02%+0.28
15 Jan 20262.74%0.00
31 Dec 20252.74%0.00
15 Dec 20252.74%+0.18
28 Nov 20252.56%+0.15
14 Nov 20252.41%+0.12
31 Oct 20252.29%+0.22
15 Oct 20252.07%−0.18
30 Sep 20252.25%+0.14
15 Sep 20252.11%−0.09
29 Aug 20252.20%+0.05
15 Aug 20252.15%−0.07
31 Jul 20252.22%+0.01
15 Jul 20252.21%−0.27
15 May 20252.48%−0.08
30 Apr 20252.56%+0.04
15 Apr 20252.52%+0.04
31 Mar 20252.48%+0.09
14 Mar 20252.39%+0.01
28 Feb 20252.38%+0.02
14 Feb 20252.36%+0.07
31 Jan 20252.29%+0.15
15 Jan 20252.14%+0.04
31 Dec 20242.10%+0.13
13 Dec 20241.97%−0.13
29 Nov 20242.10%−0.13
15 Nov 20242.23%−0.09
31 Oct 20242.32%−0.10
15 Oct 20242.42%+0.11
30 Sep 20242.31%−0.25
13 Sep 20242.56%+0.09
30 Aug 20242.47%+0.14
15 Aug 20242.33%−0.10
31 Jul 20242.43%−0.36
15 Jul 20242.79%+0.28
28 Jun 20242.51%−0.69
14 Jun 20243.20%+0.85
31 May 20242.35%+0.11
15 May 20242.24%−0.44
30 Apr 20242.68%−0.31
15 Apr 20242.99%−0.29
28 Mar 20243.28%+0.07
15 Mar 20243.21%−0.05
29 Feb 20243.26%−0.05
15 Feb 20243.31%−0.12
31 Jan 20243.43%+0.24
12 Jan 20243.19%−0.19
29 Dec 20233.38%+0.11
15 Dec 20233.27%+0.15
30 Nov 20233.12%+0.19
15 Nov 20232.93%+0.21
31 Oct 20232.72%+0.07
13 Oct 20232.65%−0.03
29 Sep 20232.68%+0.03
15 Sep 20232.65%−0.15
31 Aug 20232.80%+0.09
15 Aug 20232.71%+0.22
31 Jul 20232.49%−0.21
14 Jul 20232.70%+0.14
30 Jun 20232.56%+0.02
15 Jun 20232.54%+0.01
31 May 20232.53%+0.05
15 May 20232.48%0.00
28 Apr 20232.48%+0.14
14 Apr 20232.34%−0.09
31 Mar 20232.43%+0.09
15 Mar 20232.34%−0.24
28 Feb 20232.58%+0.14
15 Feb 20232.44%−0.23
31 Jan 20232.67%+0.15
13 Jan 20232.52%+0.07
30 Dec 20222.45%+0.14
15 Dec 20222.31%+0.39
30 Nov 20221.92%−0.19
15 Nov 20222.11%−0.08
31 Oct 20222.19%+0.08
14 Oct 20222.11%−0.01
30 Sep 20222.12%−0.14
15 Sep 20222.26%−0.03
31 Aug 20222.29%−0.04
15 Aug 20222.33%−0.18
29 Jul 20222.51%+0.45
15 Jul 20222.06%−0.44
30 Jun 20222.50%+0.24
15 Jun 20222.26%−0.02
31 May 20222.28%+0.06
13 May 20222.22%+0.39
29 Apr 20221.83%−0.28
14 Apr 20222.11%−0.01
31 Mar 20222.12%+0.02
15 Mar 20222.10%+0.24
28 Feb 20221.86%−0.58
15 Feb 20222.44%+0.66
31 Jan 20221.78%−0.16
14 Jan 20221.94%−0.30
31 Dec 20212.24%−0.10
15 Dec 20212.34%+0.44
30 Nov 20211.90%−0.23
15 Nov 20212.13%−0.23
29 Oct 20212.36%0.00
15 Oct 20212.36%+0.41
30 Sep 20211.95%−0.08
15 Sep 20212.03%−0.22
31 Aug 20212.25%−0.36
13 Aug 20212.61%−0.06
30 Jul 20212.67%−0.03
15 Jul 20212.70%−0.03
30 Jun 20212.73%+0.05
15 Jun 20212.68%+0.25
28 May 20212.43%−0.01
14 May 20212.44%−0.11
30 Apr 20212.55%−0.16
15 Apr 20212.71%+0.02
31 Mar 20212.69%+0.12
15 Mar 20212.57%+0.14
26 Feb 20212.43%+0.10
12 Feb 20212.33%+0.18
29 Jan 20212.15%−0.22
15 Jan 20212.37%−0.29
31 Dec 20202.66%+0.34
15 Dec 20202.32%+0.01
30 Nov 20202.31%−0.06
13 Nov 20202.37%+0.03
30 Oct 20202.34%−0.38
15 Oct 20202.72%−0.02
30 Sep 20202.74%−0.11
15 Sep 20202.85%−0.16
31 Aug 20203.01%+0.02
14 Aug 20202.99%−0.13
31 Jul 20203.12%+0.15
15 Jul 20202.97%−0.14
30 Jun 20203.11%−0.24
15 Jun 20203.35%−0.35
29 May 20203.70%−0.65
15 May 20204.35%−0.02
30 Apr 20204.37%−0.14
15 Apr 20204.51%−0.16
31 Mar 20204.67%+0.03
13 Mar 20204.64%+0.42
28 Feb 20204.22%−0.37
14 Feb 20204.59%−0.57
31 Jan 20205.16%+0.17
15 Jan 20204.99%−0.02
31 Dec 20195.01%−0.16
13 Dec 20195.17%−0.15
29 Nov 20195.32%−0.64
15 Nov 20195.96%−0.19
31 Oct 20196.15%−0.96
15 Oct 20197.11%+0.22
30 Sep 20196.89%+0.27
13 Sep 20196.62%+0.10
30 Aug 20196.52%+0.12
15 Aug 20196.40%−0.23
31 Jul 20196.63%−0.73
15 Jul 20197.36%+0.56
15 May 20196.80%−0.06
30 Apr 20196.86%−0.90
15 Apr 20197.76%+0.09
29 Mar 20197.67%−0.22
15 Mar 20197.89%−0.12
28 Feb 20198.01%−0.28
15 Feb 20198.29%−0.89
31 Jan 20199.18%+0.78
15 Jan 20198.40%+0.53
31 Dec 20187.87%+0.02
14 Dec 20187.85%−0.77
30 Nov 20188.62%+0.39
15 Nov 20188.23%+0.21
31 Oct 20188.02%−0.05
15 Oct 20188.07%+0.27
28 Sep 20187.80%+0.16
14 Sep 20187.64%+0.27
31 Aug 20187.37%−0.23
15 Aug 20187.60%+0.19
31 Jul 20187.41%+0.03
13 Jul 20187.38%−1.13
29 Jun 20188.51%+0.43
15 Jun 20188.08%−0.14
31 May 20188.22%+0.21
15 May 20188.01%−0.26
30 Apr 20188.27%−0.67
13 Apr 20188.94%−0.71
29 Mar 20189.65%−0.32
15 Mar 20189.97%+0.93
28 Feb 20189.04%−0.43
15 Feb 20189.47%−1.19
31 Jan 201810.66%+2.10
12 Jan 20188.56%−0.28
29 Dec 20178.84%–

Newest first. Scroll inside the table for earlier dates, back to 29 Dec 2017.

Frequently asked questions

How shorted is Fastenal Company right now?
3.11% of Fastenal Company's (FAST) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 2,420th 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 FAST'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 FAST's days to cover?
5.78 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.