Builders FirstSource, Inc.
US ˙ NYSE ˙ US12008R1077

SecurityBLDR / Builders FirstSource, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership2,967,744 shares
Latest Disclosed Value $ 244,300,941
Dimensional Fund Advisors Lp reports 12.34% increase in ownership of BLDR / Builders FirstSource, Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 2,967,744 shares of Builders FirstSource, Inc. (US:BLDR) valued at $244,334,364 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 2,641,809 shares of Builders FirstSource, Inc.. This represents a change in shares of 12.34% during the quarter. The current value of the position is $220,384,669 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-07 2026-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 2,967,744 325,935 12.34 244,301 -10.12 0.0109
2026-02-12 2025-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 2,641,809 725,905 37.89 271,816 17.02 0.0570
2025-11-12 2025-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 1,915,904 -278,358 -12.69 232,279 -9.29 0.0498
2025-08-12 2025-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 2,194,262 -50,187 -2.24 256,062 -8.68 0.0593
2025-05-13 2025-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 2,244,449 6,453 0.29 280,387 -12.35 0.0697
2025-02-13 2024-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 2,237,996 77,666 3.60 319,898 -23.62 0.0768
2024-11-07 2024-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 2,160,330 -53,437 -2.41 418,811 36.68 0.1016
2024-08-09 2024-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 2,213,767 -268,712 -10.82 306,419 -40.81 0.0800
2024-05-10 2024-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 2,482,479 -516,695 -17.23 517,721 3.40 0.1402
2024-02-07 2023-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 2,999,174 -1,158,056 -27.86 500,721 -3.26 0.1462
2023-11-09 2023-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 4,157,230 -61,394 -1.46 517,588 -9.79 0.1698
2023-08-09 2023-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 4,218,624 -157,978 -3.61 573,753 47.68 0.1829
2023-05-12 2023-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 4,376,602 -166,261 -3.66 388,508 132,045.24 0.1309
2023-02-09 2022-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 4,542,863 -21,050 -0.46 295 -99.89 0.0871
2022-11-10 2022-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 4,563,913 64,900 1.44 268,900 11.32 0.1032
2022-08-12 2022-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 4,499,013 41,378 0.93 241,555 -16.06 0.0866
2022-05-13 2022-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 4,457,635 117,308 2.70 287,766 -22.64 0.0886
2022-02-09 2021-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 4,340,327 82,305 1.93 371,973 68.82 0.1125
2021-11-12 2021-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 4,258,022 -157,433 -3.57 220,332 16.97 0.0710
2021-08-12 2021-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 4,415,455 -2,124,255 -32.48 188,361 -37.88 0.0596
2021-05-14 2021-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 6,539,710 2,755,390 72.81 303,242 96.34 0.1003
2021-03-08 2020-12-31 13F/A-2 BUILDERS FIRSTSOURCE COM 12008R107 3,784,320 -102,296 -2.63 154,450 21.83 0.0558
2021-02-11 2020-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 3,784,320 -102,296 154,450 55,779.1305
2020-11-12 2020-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 3,886,616 -508,341 -11.57 126,774 39.35 0.0538
2020-08-13 2020-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 4,394,957 400,940 10.04 90,973 86.22 0.0400
2020-05-14 2020-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 3,994,017 87,106 2.23 48,852 -50.79 0.0255
2020-02-14 2019-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 3,906,911 -22,790 -0.58 99,275 22.79 0.0362
2019-11-12 2019-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 3,929,701 848 0.02 80,852 22.06 0.0314
2019-08-13 2019-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 3,928,853 57,551 1.49 66,237 28.26 0.0257
2019-08-12 2019-03-31 13F/A-2 BUILDERS FIRSTSOURCE COM 12008R107 3,871,302 328,792 9.28 51,643 33.62 0.0206
2019-05-10 2019-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 3,871,302 328,792 51,643
2019-02-26 2018-12-31 13F/A-1 BUILDERS FIRSTSOURCE COM 12008R107 3,542,510 182,727 5.44 38,649 -21.64 0.0175
2019-02-13 2018-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 3,542,510 182,727 38,649
2018-11-13 2018-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 3,359,783 -19,336 -0.57 49,322 -20.20 0.0188
2018-08-10 2018-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 3,379,119 2,286 0.07 61,804 -7.75 0.0246
2018-05-11 2018-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 3,376,833 31,109 0.93 66,996 -8.10 0.0279
2018-02-12 2017-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 3,345,724 88,082 2.70 72,904 24.40 0.0302
2017-11-13 2017-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 3,257,642 63,672 1.99 58,604 19.77 0.0256
2017-08-11 2017-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 3,193,970 174,777 5.79 48,931 8.77 0.0226
2017-05-12 2017-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 3,019,193 71,261 2.42 44,986 39.10 0.0215
2017-02-09 2016-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 2,947,932 130,963 4.65 32,340 -0.26 0.0162
2016-11-10 2016-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 2,816,969 164,161 6.19 32,423 8.65 0.0175
2016-08-09 2016-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 2,652,808 250,408 10.42 29,843 10.23 0.0172
2016-05-13 2016-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 2,402,400 127,766 5.62 27,073 7.43 0.0162
2016-02-10 2015-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 2,274,634 530,249 30.40 25,201 13.93 0.0157
2015-11-13 2015-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 1,744,385 500,286 40.21 22,119 38.47 0.0145
2015-08-14 2015-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 1,244,099 335,838 36.98 15,974 163.68 0.0098
2015-05-14 2015-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 908,261 149,925 19.77 6,058 16.28 0.0038
2015-02-06 2014-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 758,336 -73,097 -8.79 5,210 14.99 0.0034
2014-11-13 2014-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 831,433 -78,531 -8.63 4,531 -33.44 0.0032
2014-08-08 2014-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 909,964 -52,528 -5.46 6,807 -22.37 0.0047
2014-05-14 2014-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 962,492 -142,952 -12.93 8,768 11.09 0.0066
2014-02-12 2013-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 1,105,444 -120,345 -9.82 7,893 9.50 0.0062
2013-11-13 2013-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 1,225,789 -141,309 -10.34 7,208 -11.83 0.0062
2013-08-15 2013-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 1,367,098 1,367,098 8,175 0.0077
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.