Builders FirstSource, Inc.
DE ˙ DB ˙ US12008R1077
64,22 € ↓ -0,04 (-0,06%)
2026-06-03
DEL PRIS
SecurityDE:B1F / Builders FirstSource, Inc.
InstitutionXTX Topco Ltd
Latest Disclosed Ownership62,966 shares
Latest Disclosed Value $ 5,183,991
XTX Topco Ltd reports 407.50% increase in ownership of B1F / Builders FirstSource, Inc.

On May 15, 2026 - XTX Topco Ltd filed a 13F-HR form disclosing ownership of 62,966 shares of Builders FirstSource, Inc. (DE:B1F) valued at $4,348,432 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 12,407 shares of Builders FirstSource, Inc.. This represents a change in shares of 407.50% during the quarter. The current value of the position is $4,043,677 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 62,966 50,559 407.50 5,184 306.19 0.0901
2026-02-17 2025-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 12,407 4,170 50.63 1,277 27.86 0.0335
2025-11-14 2025-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 8,237 8,237 999 0.0518
2025-08-12 2025-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 0 -7,593 -100.00 0 -100.00
2025-05-08 2025-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 7,593 7,593 949 0.0485
2025-02-13 2024-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 0 -10,579 -100.00 0 -100.00
2024-11-14 2024-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 10,579 9,011 574.68 2,051 844.70 0.1483
2024-08-12 2024-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 1,568 -1,093 -41.07 217 -60.83 0.0186
2024-05-13 2024-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 2,661 1,181 79.80 555 124.29 0.0748
2024-02-13 2023-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 1,480 -5,394 -78.47 247 -71.11 0.0541
2023-11-13 2023-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 6,874 -247 -3.47 856 -11.67 0.1461
2023-08-14 2023-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 7,121 7,121 968 0.1735
2022-08-15 2022-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 0 -8,802 -100.00 0 -100.00
2022-05-13 2022-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 8,802 8,802 568 0.2491
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.