Builders FirstSource, Inc.
DE ˙ DB ˙ US12008R1077
64,26 € ↓ -1,00 (-1,53%)
2026-06-02
DEL PRIS
SecurityDE:B1F / Builders FirstSource, Inc.
InstitutionOssiam
Latest Disclosed Ownership8,386 shares
Latest Disclosed Value $ 690,419
Ossiam reports 0.07% decrease in ownership of B1F / Builders FirstSource, Inc.

On May 14, 2026 - Ossiam filed a 13F-HR form disclosing ownership of 8,386 shares of Builders FirstSource, Inc. (DE:B1F) valued at $579,137 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 8,392 shares of Builders FirstSource, Inc.. This represents a change in shares of -0.07% during the quarter. The current value of the position is $538,884 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)
2026-05-14 2026-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 8,386 -6 -0.07 690 -20.05 0.0121
2026-02-13 2025-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 8,392 1,512 21.98 863 3.48 0.0172
2025-11-14 2025-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 6,880 564 8.93 834 13.16 0.0107
2025-08-13 2025-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 6,316 15 0.24 737 -6.35 0.0083
2025-05-14 2025-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 6,301 -5,098 -44.72 787 -51.69 0.0110
2025-02-13 2024-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 11,399 1,161 11.34 1,629 -17.89 0.0281
2024-11-13 2024-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 10,238 454 4.64 1,985 46.53 0.0384
2024-08-13 2024-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 9,784 133 1.38 1,354 -32.70 0.0257
2024-05-13 2024-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 9,651 -3,364 -25.85 2,013 -7.37 0.0353
2024-02-13 2023-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 13,015 700 5.68 2,173 41.68 0.0350
2023-11-14 2023-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 12,315 244 2.02 1,533 -6.58 0.0271
2023-08-11 2023-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 12,071 9,725 414.54 1,642 688.94 0.0295
2023-05-12 2023-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 2,346 1,054 81.58 208 150.60 0.0043
2023-02-13 2022-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 1,292 0 0.00 84 9.21 0.0022
2022-11-14 2022-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 1,292 1,292 76 0.0022
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.