Builders FirstSource, Inc.
MX ˙ BMV ˙ US12008R1077
SecurityMX:BLDR / Builders FirstSource, Inc.
InstitutionProShare Advisors LLC
Latest Disclosed Ownership20,167 shares
Latest Disclosed Value $ 1,660,349
ProShare Advisors LLC reports 17.35% decrease in ownership of BLDR / Builders FirstSource, Inc.

On April 24, 2026 - ProShare Advisors LLC filed a 13F-HR form disclosing ownership of 20,167 shares of Builders FirstSource, Inc. (MX:BLDR) valued at $1,660,349 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 24,401 shares of Builders FirstSource, Inc.. This represents a change in shares of -17.35% during the quarter.

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)
2026-04-24 2026-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 20,167 -4,234 -17.35 1,660 -33.86 0.0025
2026-02-06 2025-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 24,401 1,568 6.87 2,511 -9.32 0.0044
2025-11-06 2025-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 22,833 -4,846 -17.51 2,769 -14.28 0.0058
2025-08-07 2025-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 27,679 568 2.10 3,230 -4.66 0.0064
2025-05-08 2025-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 27,111 1,524 5.96 3,387 -7.38 0.0076
2025-02-14 2024-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 25,587 6,534 34.29 3,657 -0.97 0.0084
2024-11-14 2024-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 19,053 -163 -0.85 3,694 38.89 0.0091
2024-08-13 2024-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 19,216 3,517 22.40 2,660 -18.78 0.0071
2024-05-08 2024-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 15,699 -553 -3.40 3,274 20.68 0.0087
2024-02-14 2023-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 16,252 9,499 140.66 2,713 222.98 0.0083
2023-11-13 2023-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 6,753 -734 -9.80 841 -17.49 0.0026
2023-08-10 2023-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 7,487 -1,269 -14.49 1,018 31.02 0.0030
2023-05-26 2023-03-31 13F/A-1 BUILDERS FIRSTSOURCE COM 12008R107 8,756 -828 -8.64 777 25.12 0.0024
2023-05-12 2023-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 8,756 -828 777 0.0025
2023-02-02 2022-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 9,584 625 6.98 622 17.61 0.0022
2022-11-07 2022-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 8,959 -1,052 -10.51 528 -1.86 0.0020
2022-08-01 2022-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 10,011 -5,471 -35.34 538 -46.20 0.0018
2022-05-10 2022-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 15,482 -2,766 -15.16 1,000 -36.10 0.0021
2022-02-08 2021-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 18,248 3,027 19.89 1,565 98.60 0.0031
2021-11-12 2021-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 15,221 -454 -2.90 788 17.79 0.0022
2021-08-13 2021-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 15,675 -54,757 -77.74 669 -79.52 0.0020
2021-05-14 2021-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 70,432 35,629 102.37 3,266 130.00 0.0103
2021-02-09 2020-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 34,803 12,717 57.58 1,420 97.22 0.0053
2020-11-13 2020-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 22,086 6,324 40.12 720 120.86 0.0033
2020-08-03 2020-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 15,762 15,762 326 0.0017
2020-05-15 2020-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 0 -15,506 -100.00 0 -100.00
2020-02-12 2019-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 15,506 2,452 18.78 394 46.47 0.0018
2019-11-12 2019-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 13,054 999 8.29 269 32.51 0.0015
2019-08-13 2019-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 12,055 -339 -2.74 203 23.03 0.0012
2019-05-15 2019-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 12,394 475 3.99 165 26.92 0.0010
2019-02-14 2018-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 11,919 -1,909 -13.81 130 -35.96 0.0009
2018-11-14 2018-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 13,828 -1,062 -7.13 203 -25.37 0.0014
2018-08-13 2018-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 14,890 776 5.50 272 -2.86 0.0018
2018-05-14 2018-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 14,114 -2,277 -13.89 280 -21.57 0.0018
2018-02-14 2017-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 16,391 16,391 357 0.0025
2017-05-08 2017-03-31 13F/A-1 BUILDERS FIRSTSOURCE COM 12008R107 0 -13,472 -100.00 0 -100.00
2017-02-13 2016-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 13,472 13,472 0.00 148 0.0016
2016-11-10 2016-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 0 -10,813 -100.00 0 -100.00
2016-08-12 2016-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 10,813 10,813 0.00 122 0.0016
2015-01-30 2014-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 0 -18,144 -100.00 0 -100.00
2014-11-06 2014-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 18,144 -4,108 -18.46 99 -40.36 0.0013
2014-08-08 2014-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 22,252 -22,978 -50.80 166 -59.71 0.0022
2014-05-07 2014-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 45,230 45,230 60.30 412 148.19 0.0052
2014-02-04 2013-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 0 -28,215 -100.00 0 -100.00
2013-11-07 2013-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 28,215 -1,053 -3.60 166 -5.14 0.0039
2013-07-25 2013-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 29,268 29,268 175 0.0034
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.