Builders FirstSource (BLDR)
Builders FirstSource on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, financials, earnings dates and insider trades. Listed on NYSE, classified by the SEC as retail-lumber & other building materials dealers.
9.2M
Short interest
settlement 2026-09-30
1.9
Days to cover
-1.4 days vs prior
29.8%
Short share of volume
2026-10-09
154
Fails to deliver
settlement 2026-09-04
Thu 29 Oct
Next earnings
estimated date
$0
Insider flow, 90 days
0 buys, 0 sells
As of 2026-10-09.
Short interest
FINRA, twice a month. The newest 24 settlements in the table, 48 in the chart. JSONAs of 30 September 2026, short interest in BLDR is 9,165,569 shares, up 1,336,346 shares over the last month. Over the last 48 readings it ranged from 2,111,707 shares (29 November 2024) to 9,165,569 shares (30 September 2026). The latest reading sits at the top of that range. At the reported average volume of 4.7M shares a day that is 1.9 days to cover.
Embed this chart.The embed keeps its attribution line.
<iframe src="https://xoomar.com/embed/stocks/bldr" width="100%" height="440" style="border:0;max-width:100%" loading="lazy" title="XOOMAR chart"></iframe>
| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-09-30 | 9,165,569 | +2.9% | 4,723,820 | 1.94 |
| 2026-09-15 | 8,907,075 | +13.8% | 2,642,881 | 3.37 |
| 2026-08-31 | 7,829,223 | +7.8% | 1,789,115 | 4.38 |
| 2026-08-14 | 7,264,682 | -9.3% | 1,938,857 | 3.75 |
| 2026-07-31 | 8,013,450 | +11.3% | 2,627,706 | 3.05 |
| 2026-07-15 | 7,200,190 | -5.3% | 1,994,731 | 3.61 |
| 2026-06-30 | 7,603,336 | -4.2% | 2,651,727 | 2.87 |
| 2026-06-15 | 7,936,719 | -9.8% | 2,222,803 | 3.57 |
| 2026-05-29 | 8,797,863 | +1.3% | 3,394,283 | 2.59 |
| 2026-05-15 | 8,682,445 | +7.7% | 3,043,729 | 2.85 |
| 2026-04-30 | 8,059,726 | +11.5% | 2,569,008 | 3.14 |
| 2026-04-15 | 7,230,744 | +2.1% | 1,928,317 | 3.75 |
| 2026-03-31 | 7,084,828 | +7.3% | 2,159,622 | 3.28 |
| 2026-03-13 | 6,603,493 | +18.4% | 3,009,664 | 2.19 |
| 2026-02-27 | 5,576,445 | +18.7% | 2,122,556 | 2.63 |
| 2026-02-13 | 4,698,707 | +4.2% | 2,711,184 | 1.73 |
| 2026-01-30 | 4,508,345 | -5.2% | 1,863,688 | 2.42 |
| 2026-01-15 | 4,753,876 | -0.3% | 2,244,318 | 2.12 |
| 2025-12-31 | 4,765,888 | +4.1% | 1,486,785 | 3.21 |
| 2025-12-15 | 4,578,394 | -10.6% | 1,792,883 | 2.55 |
| 2025-11-28 | 5,122,241 | -8.1% | 2,596,118 | 1.97 |
| 2025-11-14 | 5,573,309 | -5.3% | 2,529,470 | 2.20 |
| 2025-10-31 | 5,884,781 | -6.2% | 1,799,172 | 3.27 |
| 2025-10-15 | 6,275,268 | -8.5% | 1,690,007 | 3.71 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 9 October 2026, the short share of BLDR volume is 29.8%, down 8.4 points over the last five sessions. Over the last 30 readings it ranged from 28.4% (9 September 2026) to 53.9% (5 October 2026). The latest reading sits at the bottom of that range. The latest reading is 10.0 points below the 30-session average of 39.8%, on 902K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-09 | 269K | 902K | 29.8% | 3 |
| 2026-10-08 | 356K | 1.1M | 33.4% | 44 |
| 2026-10-07 | 519K | 1.1M | 48.1% | 19,553 |
| 2026-10-06 | 357K | 979K | 36.5% | 29 |
| 2026-10-05 | 489K | 906K | 53.9% | 1,900 |
| 2026-10-02 | 315K | 823K | 38.3% | 839 |
| 2026-10-01 | 447K | 988K | 45.2% | 108 |
| 2026-09-30 | 455K | 1000K | 45.5% | 92 |
| 2026-09-29 | 426K | 864K | 49.3% | 61,061 |
| 2026-09-28 | 314K | 906K | 34.6% | 2 |
| 2026-09-25 | 223K | 654K | 34.1% | 145 |
| 2026-09-24 | 373K | 1.3M | 29.4% | 3,921 |
| 2026-09-23 | 261K | 739K | 35.4% | 2,285 |
| 2026-09-22 | 358K | 1.1M | 32.9% | 34 |
| 2026-09-21 | 452K | 1.5M | 30.3% | 140 |
| 2026-09-18 | 803K | 1.7M | 48.1% | 8 |
| 2026-09-17 | 582K | 1.6M | 37.4% | 9 |
| 2026-09-16 | 609K | 1.2M | 52.6% | 212 |
| 2026-09-15 | 395K | 1.1M | 36.8% | 0 |
| 2026-09-14 | 391K | 1.0M | 38.3% | 2,657 |
| 2026-09-11 | 411K | 930K | 44.2% | 0 |
| 2026-09-10 | 643K | 1.7M | 37.5% | 3,815 |
| 2026-09-09 | 293K | 1.0M | 28.4% | 69 |
| 2026-09-08 | 476K | 1.1M | 44.2% | 1,696 |
| 2026-09-04 | 378K | 1.0M | 37.5% | 25 |
| 2026-09-03 | 292K | 650K | 44.9% | 597 |
| 2026-09-02 | 292K | 934K | 31.3% | 550 |
| 2026-09-01 | 661K | 1.8M | 36.9% | 4,615 |
| 2026-08-31 | 403K | 774K | 52.0% | 0 |
| 2026-08-28 | 381K | 804K | 47.4% | 36 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 4 September 2026, the fails-to-deliver balance in BLDR is 154 shares, up 136 shares over the last settlement date. Over the last 30 readings it ranged from 18 shares (4 June 2026) to 34,528 shares (14 August 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-04 | 154 | $64.18 | $10K |
| 2026-08-20 | 18 | $72.55 | $1K |
| 2026-08-17 | 50 | $72.51 | $4K |
| 2026-08-14 | 34,528 | $73.56 | $2.5M |
| 2026-08-07 | 4,395 | $72.51 | $319K |
| 2026-08-06 | 834 | $75.86 | $63K |
| 2026-08-03 | 79 | $66.44 | $5K |
| 2026-07-31 | 300 | $66.01 | $20K |
| 2026-07-24 | 200 | $70.55 | $14K |
| 2026-07-23 | 200 | $71.03 | $14K |
| 2026-07-22 | 200 | $69.74 | $14K |
| 2026-07-15 | 11,023 | $75.16 | $828K |
| 2026-07-09 | 240 | $74.20 | $18K |
| 2026-07-08 | 189 | $78.42 | $15K |
| 2026-07-07 | 11,738 | $82.33 | $966K |
| 2026-07-06 | 32,784 | $84.69 | $2.8M |
| 2026-06-30 | 24,796 | $90.51 | $2.2M |
| 2026-06-29 | 561 | $89.14 | $50K |
| 2026-06-15 | 151 | $77.77 | $12K |
| 2026-06-10 | 145 | $77.54 | $11K |
| 2026-06-09 | 311 | $73.12 | $23K |
| 2026-06-05 | 1,538 | $74.98 | $115K |
| 2026-06-04 | 18 | $74.26 | $1K |
| 2026-06-01 | 10,076 | $76.26 | $768K |
| 2026-05-29 | 173 | $76.72 | $13K |
| 2026-05-28 | 327 | $77.47 | $25K |
| 2026-05-27 | 241 | $74.41 | $18K |
| 2026-05-26 | 152 | $74.15 | $11K |
| 2026-05-21 | 430 | $71.23 | $31K |
| 2026-05-19 | 558 | $70.18 | $39K |
Insider trades
SEC Form 4, newest first, 50 of 100 shown. JSONNo open-market insider trades were reported for BLDR in the last 90 days. The most recent filings are listed below. Latest filing: Steinke Craig Arthur (Director) on 2026-09-10.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-09-10 | Steinke Craig Arthur | Director | Grant | 564 | $0.00 | $0 | 103K |
| 2026-09-10 | Charles Dirkson R | Director | Grant | 470 | $0.00 | $0 | 15K |
| 2026-09-10 | OLEARY JAMES | Director | Grant | 564 | $0.00 | $0 | 92K |
| 2026-09-10 | Renz Maria | Director | Grant | 489 | $0.00 | $0 | 7K |
| 2026-09-10 | LEVY PAUL S | Director | Grant | 1K | $0.00 | $0 | 1.7M |
| 2026-09-10 | Hayes William B | Director | Grant | 583 | $0.00 | $0 | 20K |
| 2026-09-10 | CHRISTOPHE CLEVELAND A | Director | Grant | 564 | $0.00 | $0 | 39K |
| 2026-09-10 | Boydston Cory Jacobs | Director | Grant | 470 | $0.00 | $0 | 27K |
| 2026-07-18 | O'Brien Matthew Coley | Chief Human Resources Officer | Grant | 7K | $0.00 | $0 | 7K |
| 2026-07-18 | Vaughn Paul | President - West Division | Grant | 3K | $0.00 | $0 | 41K |
| 2026-07-18 | Vance Todd | President - East Division | Grant | 3K | $0.00 | $0 | 43K |
| 2026-06-13 | Narayan Gayatri | President - Tech & Digital | Tax withholding | 3K | $77.77 | $221K | 28K |
| 2026-06-05 | Herron Stephen J | Chief Operating Officer | Gift | 850 | $0.00 | $0 | 110K |
| 2026-06-04 | Hiller Michael | COO-Designate | Gift | 900 | $0.00 | $0 | 52K |
| 2026-06-01 | LEVY PAUL S | Director | Grant | 1K | $76.26 | $80K | 1.7M |
| 2026-06-01 | Renz Maria | Director | Grant | 426 | $76.26 | $32K | 6K |
| 2026-06-01 | OLEARY JAMES | Director | Grant | 491 | $76.26 | $37K | 91K |
| 2026-06-01 | CHRISTOPHE CLEVELAND A | Director | Grant | 491 | $76.26 | $37K | 38K |
| 2026-06-01 | Hayes William B | Director | Grant | 508 | $76.26 | $39K | 20K |
| 2026-06-01 | Charles Dirkson R | Director | Grant | 409 | $76.26 | $31K | 14K |
| 2026-06-01 | Steinke Craig Arthur | Director | Grant | 491 | $76.26 | $37K | 102K |
| 2026-06-01 | Boydston Cory Jacobs | Director | Grant | 409 | $76.26 | $31K | 27K |
| 2026-06-01 | ALEXANDER MARK A | Director | Grant | 409 | $76.26 | $31K | 48K |
| 2026-05-14 | LEVY PAUL S | Director | Grant | 3K | $0.00 | $0 | 1.7M |
| 2026-05-14 | Hayes William B | Director | Grant | 3K | $0.00 | $0 | 19K |
| 2026-05-14 | Renz Maria | Director | Grant | 3K | $0.00 | $0 | 6K |
| 2026-05-14 | CHRISTOPHE CLEVELAND A | Director | Grant | 3K | $0.00 | $0 | 38K |
| 2026-05-14 | Rush David E | Director | Grant | 3K | $0.00 | $0 | 125K |
| 2026-05-14 | MILGRIM BRETT N | Director | Grant | 3K | $0.00 | $0 | 83K |
| 2026-05-14 | Steinke Craig Arthur | Director | Grant | 3K | $0.00 | $0 | 102K |
| 2026-05-14 | Charles Dirkson R | Director | Grant | 3K | $0.00 | $0 | 14K |
| 2026-05-14 | OLEARY JAMES | Director | Grant | 3K | $0.00 | $0 | 91K |
| 2026-05-14 | Boydston Cory Jacobs | Director | Grant | 3K | $0.00 | $0 | 26K |
| 2026-05-14 | ALEXANDER MARK A | Director | Grant | 3K | $0.00 | $0 | 48K |
| 2026-05-14 | AINOA CHERYL | Director | Grant | 3K | $0.00 | $0 | 5K |
| 2026-05-08 | Rush David E | Director | Sell | 5K | $78.17 | $391K | 122K |
| 2026-03-15 | Vaughn Paul | President - Central Division | Tax withholding | 3K | $88.09 | $231K | 37K |
| 2026-03-15 | Vaughn Paul | President - Central Division | Grant | 2K | $0.00 | $0 | 40K |
| 2026-03-15 | Vaughn Paul | President - Central Division | Grant | 8K | $0.00 | $0 | 38K |
| 2026-03-15 | Herron Stephen J | Chief Operating Officer | Tax withholding | 6K | $88.09 | $513K | 111K |
| 2026-03-15 | Herron Stephen J | Chief Operating Officer | Grant | 7K | $0.00 | $0 | 117K |
| 2026-03-15 | Herron Stephen J | Chief Operating Officer | Grant | 15K | $0.00 | $0 | 110K |
| 2026-03-15 | Jackson Peter M. | President & CEO | Tax withholding | 9K | $88.09 | $749K | 272K |
| 2026-03-15 | Jackson Peter M. | President & CEO | Grant | 8K | $0.00 | $0 | 281K |
| 2026-03-15 | Jackson Peter M. | President & CEO | Grant | 43K | $0.00 | $0 | 272K |
| 2026-03-15 | Hiller Michael | Chief Talent Officer | Tax withholding | 3K | $88.09 | $290K | 53K |
| 2026-03-15 | Hiller Michael | Chief Talent Officer | Grant | 6K | $0.00 | $0 | 56K |
| 2026-03-15 | Hiller Michael | Chief Talent Officer | Grant | 11K | $0.00 | $0 | 51K |
| 2026-03-15 | Robins Scott L | President - West Division | Tax withholding | 5K | $88.09 | $445K | 151K |
| 2026-03-15 | Robins Scott L | President - West Division | Grant | 6K | $0.00 | $0 | 156K |
Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.
Planned sales (Form 144)
Newest first. JSON1 Form 144 notice on file for BLDR worth $391K at the prices reported; 0 in the last 90 days worth $0. Latest: Rush David E filed on 2026-05-08 to sell 5,000 shares ($391K) from 2026-05-08.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-05-08 | Rush David EDirector | 5K | $391K | 0.005% | 2026-05-08 | Charles Schwab & Co., Inc. |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON2 holders report 5% or more of BLDR in their latest filing, all on Schedule 13G (passive). The largest reported stake is BlackRock, Inc. at 12.0% of the class (12,897,766 shares), filed 2026-10-05 for an event on 2026-09-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-10-05 | 13G/Ano. 7 | BlackRock, Inc.parent holding company | 12.9M | 12.0% | 2026-09-30 |
| 2026-04-29 | 13G | Vanguard Capital Managementinvestment adviser | 8.0M | 7.2% | 2026-03-31 |
| 2026-03-26 | 13G/Ano. 10 | The Vanguard Groupinvestment adviser | 0 | 0.0% | 2026-03-13 |
| 2025-12-05 | 13G/Ano. 2 | FMR LLCparent holding company | 3.7M | 3.3% | 2025-11-28 |
| 2025-12-05 | 13G/Ano. 2 | Abigail P. Johnsonindividual | 3.7M | 3.3% | 2025-11-28 |
13F holders
Tracked managers holding BLDR at their latest 13F. JSON6 of the 30 tracked managers held BLDR at their latest 13F, $93.8M in total at quarter-end prices. Citadel Advisors is the largest at $41.7M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 3 added shares and 3 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Citadel Advisors | 2026-06-30 | 466K | $41.7M | 0.00% | -72K |
| Millennium Management | 2026-06-30 | 355K | $31.7M | 0.01% | -217K |
| AQR Capital Management | 2026-06-30 | 133K | $11.9M | 0.00% | -6K |
| Bridgewater Associates | 2026-06-30 | 51K | $4.6M | 0.02% | +47K |
| Two Sigma Investments | 2026-06-30 | 41K | $3.7M | 0.00% | +35K |
| D. E. Shaw & Co. | 2026-06-30 | 3K | $248K | 0.00% | new |
Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.
Financials
SEC XBRL, as filed. JSONIn Q2 FY 2026 (quarter ended 2026-06-30) Builders FirstSource reported revenue of $3.86B, down 8.8% from the same quarter a year earlier, and net loss of $3.9M (-0.04 diluted EPS). In FY 2025 it generated $1.22B of operating cash flow and spent $414.0M on buybacks.
- Cash
- $65.7M
- Equity
- $4.01B
- Total assets
- $11.32B
- Shares outstanding
- 107,596,457
Quarterly, last 8 quarters
| Quarter | Period end | Revenue | Net income | Margin | Diluted EPS |
|---|---|---|---|---|---|
| Q2 FY 2026 | 2026-06-30 | $3.86B | -$3.9M | -0.1% | -0.04 |
| Q1 FY 2026 | 2026-03-31 | $3.29B | -$47.4M | -1.4% | -0.43 |
| Q4 FY 2025derived | 2025-12-31 | $3.36B | $31.5M | 0.9% | n/a |
| Q3 FY 2025 | 2025-09-30 | $3.94B | $122.4M | 3.1% | 1.10 |
| Q2 FY 2025 | 2025-06-30 | $4.23B | $185.0M | 4.4% | 1.66 |
| Q1 FY 2025 | 2025-03-31 | $3.66B | $96.3M | 2.6% | 0.84 |
| Q4 FY 2024derived | 2024-12-31 | $3.82B | $190.2M | 5.0% | n/a |
| Q3 FY 2024 | 2024-09-30 | $4.23B | $284.8M | 6.7% | 2.44 |
Fiscal years, with buybacks and dividends
| Fiscal year | Ends | Revenue | Net income | Operating cash flow | Capex | Buybacks | Dividends |
|---|---|---|---|---|---|---|---|
| FY 2025 | 2025-12-31 | $15.19B | $435.2M | $1.22B | $362.6M | $414.0M | n/a |
| FY 2024 | 2024-12-31 | $16.40B | $1.08B | $1.87B | $380.6M | $1.52B | n/a |
| FY 2023 | 2023-12-31 | $17.10B | $1.54B | $2.31B | $476.3M | $1.81B | n/a |
| FY 2022 | 2022-12-31 | $22.73B | $2.75B | $3.60B | $340.2M | $2.59B | n/a |
| FY 2021 | 2021-12-31 | $19.89B | $1.73B | $1.74B | $227.9M | $1.71B | n/a |
Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are the cash the company paid to repurchase its common stock in the year, not the amount authorized. Balance sheet lines are as of 2026-06-30; shares outstanding as of 2026-07-23 from the cover page.
What this page is
Builders FirstSource in the regulatory record
Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.
Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.
This page follows Builders FirstSource (BLDR), SEC CIK 1316835, listed on NYSE, classified by the SEC as retail-lumber & other building materials dealers. The cross-market tables live on the short interest and insider transactions hubs.
Source and updates
- Short interest
- FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-09-30.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-09.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-04.JSON and CSV
- Planned sales
- SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-05-08.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-10-05.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Financials
- SEC EDGAR 10-K and 10-Q filingsSource: SEC.Weekly; values are as filed in the 10-Q and 10-K. Latest 2026-06-30.JSON and CSV
- Earnings dates
- SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-07-30.JSON and CSV
- Insider trades
- SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-09-10.JSON and CSV
- Company record
- EDGAR filing index for CIK 1316835Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 10 requests a minute without a key, 30 with a free key from a free account.
How to read it
- Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
- Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
- Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.
Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.
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Datasets
Frequently Asked Questions
How much of BLDR is sold short?
What is BLDR's daily short volume?
Does BLDR have fails to deliver?
Are BLDR insiders buying or selling?
Have BLDR insiders filed to sell?
Who owns 5% or more of BLDR?
What did BLDR report last quarter?
Which tracked 13F managers own BLDR?
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.