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Stock research / United States / BLDR / Short interest

Builders FirstSource, Inc. short interest

9.9M shares of Builders FirstSource were sold short at the 15 October 2026 settlement, the most since 15 Oct 2021. Short sellers would need 3.9 days of normal trading to buy them back.

Shares sold short9.9Mat 15 Oct 2026
Change on the settlement before+8.4%+58% over a year
Days to cover3.89at 2.6M shares a day
Of shares in issue9.24%shares short over shares outstanding
New to this? How to read this page
  1. Short interest is the number of shares investors have borrowed and sold, betting the price will fall, and not yet bought back.
  2. Days to cover is shares short over an average day's trading: how many days it would take short sellers to buy them all back. Above 5 or so is high.
  3. Rising short interest says more investors are betting against the stock. A crowded short can also rise fast if shorts rush to buy back.
  4. Brokers report it twice a month to FINRA, about ten days after each settlement date.
  5. What is short interest?

Short interest, days to cover and the price

Short interest is the most since 15 Oct 2021, and the share price moved -55% over the last year.

Shares sold shortDays to coverShare price

Three charts on one timeline. Top: shares sold short at each settlement. Middle: days to cover, taller meaning shorts would need longer to buy back. Bottom: the share price, so you can see whether shorts added as the price fell or rose.

How it compares

every company on the site

    The bar ranks every company on the site from the lowest on the left to the highest on the right, in three equal thirds; the small figures under it are the values where each third starts, and the black tick is the middle company. The orange dot is this company; the grey ticks are the other companies in its industry (hover or tap for names). A hatched block is companies tied at none.

    Every settlement since 29 Dec 2017 as a table
    SettlementShares shortChangeAverage daily volumeDays to cover
    15 October 20269.9M+8.4%2.6M3.89
    30 September 20269.2M+2.9%4.7M1.94
    15 September 20268.9M+13.8%2.6M3.37
    31 August 20267.8M+7.8%1.8M4.38
    14 August 20267.3M-9.3%1.9M3.75
    31 July 20268.0M+11.3%2.6M3.05
    15 July 20267.2M-5.3%2.0M3.61
    30 June 20267.6M-4.2%2.7M2.87
    15 June 20267.9M-9.8%2.2M3.57
    29 May 20268.8M+1.3%3.4M2.59
    15 May 20268.7M+7.7%3.0M2.85
    30 April 20268.1M+11.5%2.6M3.14
    15 April 20267.2M+2.1%1.9M3.75
    31 March 20267.1M+7.3%2.2M3.28
    13 March 20266.6M+18.4%3.0M2.19
    27 February 20265.6M+18.7%2.1M2.63
    13 February 20264.7M+4.2%2.7M1.73
    30 January 20264.5M-5.2%1.9M2.42
    15 January 20264.8M-0.3%2.2M2.12
    31 December 20254.8M+4.1%1.5M3.21
    15 December 20254.6M-10.6%1.8M2.55
    28 November 20255.1M-8.1%2.6M1.97
    14 November 20255.6M-5.3%2.5M2.20
    31 October 20255.9M-6.2%1.8M3.27
    15 October 20256.3M-8.5%1.7M3.71
    30 September 20256.9M-14.5%2.2M3.14
    15 September 20258.0M+12.8%1.7M4.69
    29 August 20257.1M+9.5%2.0M3.58
    15 August 20256.5M+7.8%2.4M2.74
    31 July 20256.0M-12.0%2.0M3.01
    15 July 20256.9M+11.0%2.6M2.64
    30 June 20256.2M-6.8%2.7M2.32
    13 June 20256.6M+8.5%1.9M3.56
    30 May 20256.1M+25.0%2.0M3.07
    15 May 20254.9M+13.2%2.6M1.91
    30 April 20254.3M+10.6%1.4M3.08
    15 April 20253.9M-7.3%1.9M2.00
    31 March 20254.2M-14.7%1.5M2.77
    14 March 20254.9M+18.7%1.8M2.74
    28 February 20254.2M+20.4%2.3M1.79
    14 February 20253.4M-14.3%1.4M2.50
    31 January 20254.0M+15.5%1.5M2.72
    15 January 20253.5M+10.4%1.7M2.02
    31 December 20243.2M+21.8%1.8M1.80
    13 December 20242.6M+22.8%1.1M2.46
    29 November 20242.1M-7.3%1.1M1.87
    15 November 20242.3M-8.1%1.6M1.42
    31 October 20242.5M-9.7%1.1M2.21
    15 October 20242.7M-6.1%1.0M2.72
    30 September 20242.9M-18.2%1.9M1.51
    13 September 20243.6M-1.2%1.4M2.57
    30 August 20243.6M+10.8%1.3M2.83
    15 August 20243.3M+21.5%2.1M1.57
    31 July 20242.7M-8.2%1.8M1.52
    15 July 20242.9M-6.0%1.8M1.63
    28 June 20243.1M+2.5%2.4M1.31
    14 June 20243.0M-19.9%1.9M1.61
    31 May 20243.8M+21.7%2.1M1.79
    15 May 20243.1M+20.7%2.7M1.15
    30 April 20242.6M-3.3%1.3M1.99
    15 April 20242.7M-2.1%1.1M2.42
    28 March 20242.7M-13.1%1.0M2.70
    15 March 20243.1M-5.0%1.4M2.26
    29 February 20243.3M-3.5%1.5M2.19
    15 February 20243.4M-0.1%1.1M3.20
    31 January 20243.4M-3.8%1.4M2.53
    12 January 20243.6M-5.1%1.2M3.06
    29 December 20233.8M-11.9%1.4M2.66
    15 December 20234.3M-1.1%4.2M1.01
    30 November 20234.3M-4.2%1.5M2.95
    15 November 20234.5M-14.7%1.9M2.37
    31 October 20235.3M+22.7%1.5M3.58
    13 October 20234.3M-1.8%1.4M3.06
    29 September 20234.4M+5.5%1.3M3.30
    15 September 20234.1M-2.1%1.8M2.36
    31 August 20234.2M-4.5%1.7M2.47
    15 August 20234.4M+23.6%1.5M3.03
    31 July 20233.6M+0.2%1.2M3.08
    14 July 20233.6M-8.9%1.5M2.34
    30 June 20233.9M-30.9%2.7M1.48
    15 June 20235.7M+14.1%2.6M2.23
    31 May 20235.0M+2.6%2.9M1.71
    15 May 20234.9M-1.4%2.8M1.76
    28 April 20234.9M-9.4%1.8M2.70
    14 April 20235.4M+29.2%2.4M2.28
    31 March 20234.2M+0.3%2.1M2.04
    15 March 20234.2M+3.5%2.4M1.78
    28 February 20234.1M-6.5%1.7M2.37
    15 February 20234.3M-13.6%1.6M2.74
    31 January 20235.0M-10.0%1.3M3.80
    13 January 20235.6M-5.2%1.6M3.40
    30 December 20225.9M-4.5%2.1M2.86
    15 December 20226.2M-2.1%2.2M2.84
    30 November 20226.3M+0.3%1.6M3.86
    15 November 20226.3M-8.0%2.2M2.91
    31 October 20226.8M-7.1%1.8M3.73
    14 October 20227.3M-6.0%2.2M3.39
    30 September 20227.8M-15.1%2.9M2.74
    15 September 20229.2M+17.3%2.1M4.42
    31 August 20227.8M+2.9%1.5M5.23
    15 August 20227.6M-7.6%2.5M3.11
    29 July 20228.3M-0.7%2.2M3.77
    15 July 20228.3M+9.5%2.7M3.12
    30 June 20227.6M+6.8%3.8M1.97
    15 June 20227.1M-3.6%2.5M2.79
    31 May 20227.4M+21.6%3.0M2.43
    13 May 20226.1M-10.7%3.0M2.05
    29 April 20226.8M-5.7%2.5M2.67
    14 April 20227.2M+4.6%2.7M2.67
    31 March 20226.9M-0.8%2.4M2.86
    15 March 20226.9M+15.6%2.8M2.45
    28 February 20226.0M-4.8%2.2M2.75
    15 February 20226.3M-2.5%2.2M2.91
    31 January 20226.5M+10.0%2.9M2.23
    14 January 20225.9M+0.3%2.8M2.07
    31 December 20215.9M-16.7%2.8M2.07
    15 December 20217.0M-12.9%3.2M2.19
    30 November 20218.1M-12.6%2.5M3.24
    15 November 20219.2M-3.9%2.4M3.87
    29 October 20219.6M-5.9%1.6M6.03
    15 October 202110.2M+8.4%1.6M6.35
    30 September 20219.4M+5.9%2.0M4.79
    15 September 20218.9M-5.2%1.8M4.85
    31 August 20219.4M+20.0%2.3M4.12
    13 August 20217.8M-11.6%2.6M3.02
    30 July 20218.9M-8.0%2.2M3.94
    15 July 20219.6M-14.2%2.6M3.76
    30 June 202111.2M-20.5%5.6M2.02
    15 June 202114.1M+16.8%3.6M3.93
    28 May 202112.1M+5.3%2.3M5.24
    14 May 202111.5M+14.2%2.8M4.12
    30 April 202110.0M-5.9%1.5M6.48
    15 April 202110.7M-3.1%1.5M7.12
    31 March 202111.0M+11.6%2.2M5.07
    15 March 20219.9M+5.6%1.9M5.20
    26 February 20219.3M-2.9%1.6M5.75
    12 February 20219.6M+8.1%1.4M6.87
    29 January 20218.9M-12.1%2.2M3.99
    15 January 202110.1M-35.9%2.7M3.71
    31 December 202015.8M+3.1%1.8M8.71
    15 December 202015.3M+9.2%1.4M10.89
    30 November 202014.0M-6.4%1.3M10.56
    13 November 202015.0M+19.6%2.2M6.70
    30 October 202012.5M-1.1%1.3M9.68
    15 October 202012.7M+2.6%1.5M8.39
    30 September 202012.3M-2.9%2.2M5.54
    15 September 202012.7M+65.4%3.0M4.21
    31 August 20207.7M+139.4%3.0M2.59
    14 August 20203.2M+19.1%2.4M1.32
    31 July 20202.7M-3.9%784K3.44
    15 July 20202.8M-1.0%771K3.64
    30 June 20202.8M-0.5%830K3.41
    15 June 20202.8M-12.9%1.1M2.52
    29 May 20203.3M+23.8%1.1M2.85
    15 May 20202.6M-22.1%1.1M2.48
    30 April 20203.4M+12.0%1.2M2.79
    15 April 20203.0M+2.3%1.5M2.07
    31 March 20203.0M-18.3%2.1M1.41
    13 March 20203.6M+33.5%1.8M1.97
    28 February 20202.7M+2.3%2.1M1.28
    14 February 20202.6M-2.3%1.1M2.39
    31 January 20202.7M-8.0%864K3.14
    15 January 20202.9M-4.1%922K3.20
    31 December 20193.1M-11.9%1.0M2.98
    13 December 20193.5M-16.0%954K3.66
    29 November 20194.2M+2.3%968K4.29
    15 November 20194.1M-7.2%1.6M2.52
    31 October 20194.4M+28.3%1.5M2.93
    15 October 20193.4M-6.9%975K3.49
    30 September 20193.7M+2.3%1.0M3.60
    13 September 20193.6M+12.4%1.0M3.56
    30 August 20193.2M+6.5%743K4.28
    15 August 20193.0M+0.5%1.8M1.68
    31 July 20193.0M+18.1%863K3.44
    15 July 20192.5M+35.2%759K3.32
    28 June 20191.9M-8.1%1.1M1.73
    14 June 20192.0M-41.9%1.1M1.77
    31 May 20193.5M+21.2%965K3.61
    15 May 20192.9M+0.1%1.5M1.95
    30 April 20192.9M+16.0%868K3.31
    15 April 20192.5M-0.3%624K3.97
    29 March 20192.5M-20.2%575K4.33
    15 March 20193.1M-12.8%1.3M2.36
    28 February 20193.6M-1.8%1.4M2.58
    15 February 20193.6M-11.6%864K4.21
    31 January 20194.1M-0.9%587K7.01
    15 January 20194.2M-4.0%1.0M4.13
    31 December 20184.3M-5.1%1.5M2.95
    14 December 20184.6M-10.9%1.6M2.86
    30 November 20185.1M-6.6%879K5.82
    15 November 20185.5M+9.5%1.8M3.02
    31 October 20185.0M+0.9%1.8M2.82
    15 October 20185.0M+31.3%1.6M3.08
    28 September 20183.8M-0.6%1.4M2.64
    14 September 20183.8M+16.8%1.4M2.66
    31 August 20183.3M+3.6%906K3.59
    15 August 20183.1M+3.8%1.7M1.81
    31 July 20183.0M-0.3%1.0M2.98
    13 July 20183.0M-4.7%585K5.18
    29 June 20183.2M+13.0%958K3.32
    15 June 20182.8M-6.2%904K3.11
    31 May 20183.0M+4.1%1.2M2.45
    15 May 20182.9M-15.9%1.5M1.91
    30 April 20183.4M-8.5%776K4.41
    13 April 20183.7M+4.1%974K3.84
    29 March 20183.6M-7.5%797K4.51
    15 March 20183.9M-5.3%1.3M3.03
    28 February 20184.1M-2.0%1.2M3.52
    15 February 20184.2M+18.8%1.7M2.47
    31 January 20183.5M-14.0%1.2M2.90
    12 January 20184.1M-2.6%1.4M3.03
    29 December 20174.2M1.3M3.25
    Shares in millions (M) or thousands (K); hold the pointer on a figure for the exact count. FINRA publishes consolidated short interest twice a month, about ten days after each settlement.