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HowShorted

How shorted is Builders FirstSource, Inc.? BLDR

#938most shorted US stockof 3,805 ranked stocks, more shorted than 75%

8.28%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+1.00
5 reports (~10 weeks)
+1.21
days to cover
3.37
Aggregate net short position time series for Builders FirstSource, 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 Builders FirstSource, 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
30 Jul 20266.69% 15 Jul 20267.45% 31 Jul 2026+0.76
30 Apr 20266.54% 15 Apr 20268.07% 15 May 2026+1.53
17 Feb 20264.25% 13 Feb 20265.04% 27 Feb 2026+0.79
30 Oct 20255.68% 15 Oct 20255.32% 31 Oct 2025−0.36
31 Jul 20256.20% 15 Jul 20255.88% 15 Aug 2025−0.32
1 May 20253.90% 30 Apr 20254.42% 15 May 2025+0.52
20 Feb 20253.04% 14 Feb 20253.65% 28 Feb 2025+0.61
5 Nov 20242.15% 31 Oct 20241.98% 15 Nov 2024−0.17

Fails to deliver

The SEC's fails-to-deliver figure for BLDR: 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
154
4 Sep 2026
Highest in window
143,770
6 Apr 2026
Days with a balance
53
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Builders FirstSource, 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 144K shares.

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Sector: Consumer retail

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20268.28%+1.00
31 Aug 20267.28%+0.53
14 Aug 20266.75%−0.70
31 Jul 20267.45%+0.76
15 Jul 20266.69%−0.38
30 Jun 20267.07%−0.31
15 Jun 20267.38%−0.80
29 May 20268.18%+0.11
15 May 20268.07%+0.58
30 Apr 20267.49%+0.95
15 Apr 20266.54%+0.13
31 Mar 20266.41%+0.44
13 Mar 20265.97%+0.93
27 Feb 20265.04%+0.79
13 Feb 20264.25%+0.17
30 Jan 20264.08%−0.22
15 Jan 20264.30%−0.01
31 Dec 20254.31%+0.17
15 Dec 20254.14%−0.49
28 Nov 20254.63%−0.41
14 Nov 20255.04%−0.28
31 Oct 20255.32%−0.36
15 Oct 20255.68%−0.52
30 Sep 20256.20%−1.06
15 Sep 20257.26%+0.83
29 Aug 20256.43%+0.55
15 Aug 20255.88%+0.43
31 Jul 20255.45%−0.75
15 Jul 20256.20%+0.61
30 Jun 20255.59%−0.40
13 Jun 20255.99%+0.47
30 May 20255.52%+1.10
15 May 20254.42%+0.52
30 Apr 20253.90%+0.47
15 Apr 20253.43%−0.27
31 Mar 20253.70%−0.64
14 Mar 20254.34%+0.69
28 Feb 20253.65%+0.61
14 Feb 20253.04%−0.46
31 Jan 20253.50%+0.47
15 Jan 20253.03%+0.29
31 Dec 20242.74%+0.49
13 Dec 20242.25%+0.42
29 Nov 20241.83%−0.15
15 Nov 20241.98%−0.17
31 Oct 20242.15%−0.21
15 Oct 20242.36%−0.15
30 Sep 20242.51%−0.56
13 Sep 20243.07%−0.03
30 Aug 20243.10%+0.30
15 Aug 20242.80%+0.60
31 Jul 20242.20%−0.20
15 Jul 20242.40%−0.15
28 Jun 20242.55%+0.06
14 Jun 20242.49%−0.61
31 May 20243.10%+0.55
15 May 20242.55%+0.46
30 Apr 20242.09%−0.07
15 Apr 20242.16%−0.05
28 Mar 20242.21%−0.33
15 Mar 20242.54%−0.14
29 Feb 20242.68%−0.09
15 Feb 20242.77%0.00
31 Jan 20242.77%−0.12
12 Jan 20242.89%−0.15
29 Dec 20233.04%−0.41
15 Dec 20233.45%−0.04
30 Nov 20233.49%−0.16
15 Nov 20233.65%−0.62
31 Oct 20234.27%+0.83
13 Oct 20233.44%−0.06
29 Sep 20233.50%+0.18
15 Sep 20233.32%−0.07
31 Aug 20233.39%−0.16
15 Aug 20233.55%+0.68
31 Jul 20232.87%+0.07
14 Jul 20232.80%−0.27
30 Jun 20233.07%−1.37
15 Jun 20234.44%+0.55
31 May 20233.89%+0.09
15 May 20233.80%−0.05
28 Apr 20233.85%+0.15
14 Apr 20233.70%+0.84
31 Mar 20232.86%0.00
15 Mar 20232.86%+0.10
28 Feb 20232.76%−0.19
15 Feb 20232.95%−0.47
31 Jan 20233.42%−0.38
13 Jan 20233.80%−0.20
30 Dec 20224.00%−0.19
15 Dec 20224.19%−0.09
30 Nov 20224.28%+0.01
15 Nov 20224.27%−0.10
31 Oct 20224.37%−0.34
14 Oct 20224.71%−0.30
30 Sep 20225.01%−0.89
15 Sep 20225.90%+0.87
31 Aug 20225.03%+0.14
15 Aug 20224.89%−0.40
29 Jul 20225.29%+0.48
15 Jul 20224.81%+0.42
30 Jun 20224.39%+0.28
15 Jun 20224.11%−0.16
31 May 20224.27%+0.76
13 May 20223.51%−0.04
29 Apr 20223.55%−0.21
14 Apr 20223.76%+0.17
31 Mar 20223.59%−0.03
15 Mar 20223.62%+0.49
28 Feb 20223.13%−0.16
15 Feb 20223.29%−0.08
31 Jan 20223.37%+0.30
14 Jan 20223.07%+0.01
31 Dec 20213.06%−0.61
15 Dec 20213.67%−0.55
30 Nov 20214.22%−0.61
15 Nov 20214.83%+0.19
29 Oct 20214.64%−0.29
15 Oct 20214.93%+0.38
30 Sep 20214.55%+0.25
15 Sep 20214.30%−0.23
31 Aug 20214.53%+0.75
13 Aug 20213.78%−0.49
30 Jul 20214.27%−0.38
15 Jul 20214.65%−0.77
30 Jun 20215.42%−1.39
15 Jun 20216.81%+0.98
28 May 20215.83%+0.29
14 May 20215.54%−3.06
30 Apr 20218.60%−0.53
15 Apr 20219.13%−0.29
31 Mar 20219.42%+0.98
15 Mar 20218.44%+0.44
26 Feb 20218.00%−0.23
12 Feb 20218.23%+0.62
29 Jan 20217.61%−1.05
15 Jan 20218.66%−4.85
31 Dec 202013.51%+0.40
15 Dec 202013.11%+1.10
30 Nov 202012.01%−0.81
13 Nov 202012.82%+2.10
30 Oct 202010.72%−0.12
15 Oct 202010.84%+0.27
30 Sep 202010.57%−0.31
15 Sep 202010.88%+4.30
31 Aug 20206.58%+3.83
14 Aug 20202.75%+0.44
31 Jul 20202.31%−0.10
15 Jul 20202.41%−0.02
30 Jun 20202.43%−0.01
15 Jun 20202.44%−0.36
29 May 20202.80%+0.53
15 May 20202.27%−0.64
30 Apr 20202.91%+0.30
15 Apr 20202.61%+0.06
31 Mar 20202.55%−0.58
13 Mar 20203.13%+0.79
28 Feb 20202.34%+0.05
14 Feb 20202.29%−0.05
31 Jan 20202.34%−0.21
15 Jan 20202.55%−0.10
31 Dec 20192.65%−0.36
13 Dec 20193.01%−0.58
29 Nov 20193.59%+0.08
15 Nov 20193.51%−0.27
31 Oct 20193.78%+0.83
15 Oct 20192.95%−0.22
30 Sep 20193.17%+0.08
13 Sep 20193.09%+0.34
30 Aug 20192.75%+0.16
15 Aug 20192.59%+0.02
31 Jul 20192.57%+0.39
15 Jul 20192.18%+0.57
28 Jun 20191.61%−0.14
14 Jun 20191.75%−1.27
31 May 20193.02%+0.53
15 May 20192.49%−0.02
30 Apr 20192.51%+0.35
15 Apr 20192.16%−0.01
29 Mar 20192.17%−0.55
15 Mar 20192.72%−0.39
28 Feb 20193.11%−0.06
15 Feb 20193.17%−0.42
31 Jan 20193.59%−0.03
15 Jan 20193.62%−0.15
31 Dec 20183.77%−0.20
14 Dec 20183.97%−0.49
30 Nov 20184.46%−0.31
15 Nov 20184.77%+0.41
31 Oct 20184.36%+0.04
15 Oct 20184.32%+1.03
28 Sep 20183.29%−0.02
14 Sep 20183.31%+0.48
31 Aug 20182.83%+0.10
15 Aug 20182.73%+0.08
31 Jul 20182.65%−0.01
13 Jul 20182.66%−0.13
29 Jun 20182.79%+0.32
15 Jun 20182.47%−0.16
31 May 20182.63%+0.11
15 May 20182.52%−0.48
30 Apr 20183.00%−0.28
13 Apr 20183.28%+0.13
29 Mar 20183.15%−0.26
15 Mar 20183.41%−0.19
28 Feb 20183.60%−0.11
15 Feb 20183.71%+0.59
31 Jan 20183.12%−0.51
12 Jan 20183.63%−0.10
29 Dec 20173.73%–

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

Frequently asked questions

How shorted is Builders FirstSource, Inc. right now?
8.28% of Builders FirstSource, Inc.'s (BLDR) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 938th 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 BLDR'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 BLDR's days to cover?
3.37 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.