Builders FirstSource, Inc.
DE ˙ DB ˙ US12008R1077
64,22 € ↓ -0,04 (-0,06%)
2026-06-03
CENA AKCJI
SecurityDE:B1F / Builders FirstSource, Inc.
InstitutionHolocene Advisors, LP
Latest Disclosed Ownership562,881 shares
Latest Disclosed Value $ 46,341,993
Holocene Advisors, LP reports 1,589.57% increase in ownership of B1F / Builders FirstSource, Inc.

On May 15, 2026 - Holocene Advisors, LP filed a 13F-HR form disclosing ownership of 562,881 shares of Builders FirstSource, Inc. (DE:B1F) valued at $38,872,562 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 33,315 shares of Builders FirstSource, Inc.. This represents a change in shares of 1,589.57% during the quarter. The current value of the position is $36,148,218 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 562,881 529,566 1,589.57 46,342 1,252.23 0.1118
2026-02-17 2025-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 33,315 14,883 80.75 3,428 53.40 0.0072
2025-11-14 2025-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 18,432 -20,443 -52.59 2,235 -50.75 0.0051
2025-08-14 2025-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 38,875 25,931 200.33 4,536 180.52 0.0111
2025-05-15 2025-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 12,944 5,177 66.65 1,617 45.68 0.0047
2025-02-14 2024-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 7,767 -187,588 -96.02 1,110 -97.07 0.0036
2024-11-14 2024-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 195,355 195,355 37,872 0.1529
2023-05-15 2023-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 0 -5,242 -100.00 0 -100.00
2023-02-14 2022-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 5,242 5,242 340 0.0021
2019-02-14 2018-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 0 -78,805 -100.00 0 -100.00
2018-11-14 2018-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 78,805 78,805 1,157 0.0187
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.