Builders FirstSource, Inc.
US ˙ NYSE ˙ US12008R1077

SecurityBLDR / Builders FirstSource, Inc.
InstitutionBrown Advisory Inc
Latest Disclosed Ownership9,749 shares
Latest Disclosed Value $ 802,635
Brown Advisory Inc reports 0.05% increase in ownership of BLDR / Builders FirstSource, Inc.

On May 15, 2026 - Brown Advisory Inc filed a 13F-HR form disclosing ownership of 9,749 shares of Builders FirstSource, Inc. (US:BLDR) valued at $802,635 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 9,744 shares of Builders FirstSource, Inc.. This represents a change in shares of 0.05% during the quarter. The current value of the position is $723,961 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)
2026-05-15 2026-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 9,749 5 0.05 803 -19.96 0.0006
2026-02-13 2025-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 9,744 -196 -1.97 1,003 -16.85 0.0014
2025-11-14 2025-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 9,940 117 1.19 1,205 5.15 0.0016
2025-08-13 2025-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 9,823 -623 -5.96 1,146 -12.18 0.0015
2025-04-30 2025-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 10,446 241 2.36 1,305 -10.49 0.0019
2025-02-14 2024-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 10,205 -31 -0.30 1,459 -26.51 0.0019
2024-11-13 2024-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 10,236 -3,439 -25.15 1,984 4.86 0.0025
2024-08-14 2024-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 13,675 -925 -6.34 1,893 -37.84 0.0025
2024-04-24 2024-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 14,600 30 0.21 3,045 25.16 0.0041
2024-02-08 2023-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 14,570 -441 -2.94 2,432 30.19 0.0034
2023-10-25 2023-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 15,011 -2,228 -12.92 1,869 -20.31 0.0031
2023-07-31 2023-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 17,239 -2,524 -12.77 2,345 33.64 0.0037
2023-05-08 2023-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 19,763 -1,139 -5.45 1,755 29.35 0.0030
2023-02-13 2022-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 20,902 -670 -3.11 1,356 6.69 0.0025
2022-11-14 2022-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 21,572 8,175 61.02 1,271 76.77 0.0025
2022-11-14 2022-06-30 13F/A-2 BUILDERS FIRSTSOURCE COM 12008R107 13,397 1,909 16.62 719 -2.97 0.0014
2022-09-13 2022-06-30 13F/A-1 BUILDERS FIRSTSOURCE COM 12008R107 13,397 1,909 719 0.0012
2022-08-02 2022-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 13,397 1,909 719 0.0012
2022-11-14 2022-03-31 13F/A-2 BUILDERS FIRSTSOURCE COM 12008R107 11,488 1,108 10.67 741 -16.74 0.0011
2022-09-13 2022-03-31 13F/A-1 BUILDERS FIRSTSOURCE COM 12008R107 11,488 1,108 741 0.0010
2022-05-09 2022-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 11,488 1,108 741 0.0010
2022-01-27 2021-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 10,380 -1,000 -8.79 890 51.10 0.0011
2021-11-12 2021-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 11,380 456 4.17 589 26.39 0.0009
2021-07-29 2021-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 10,924 430 4.10 466 -4.31 0.0007
2021-05-14 2021-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 10,494 1,170 12.55 487 27.82 0.0008
2021-02-12 2020-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 9,324 0 0.00 381 25.33 0.0007
2020-11-16 2020-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 9,324 -2,690 -22.39 304 22.09 0.0006
2020-08-14 2020-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 12,014 0 0.00 249 69.39 0.0006
2020-05-15 2020-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 12,014 1,824 17.90 147 -43.24 0.0005
2020-02-14 2019-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 10,190 0 0.00 259 23.33 0.0007
2019-11-14 2019-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 10,190 10,190 210 0.0006
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.