빌더스 FirstSource, Inc.
MX ˙ BMV ˙ US12008R1077
SecurityMX:BLDR / Builders FirstSource, Inc.
InstitutionCWM Advisors, LLC
Latest Disclosed Ownership6,120 shares
Latest Disclosed Value $ 503,859
CWM Advisors, LLC reports 55.73% decrease in ownership of BLDR / Builders FirstSource, Inc.

On May 13, 2026 - CWM Advisors, LLC filed a 13F-HR/A form disclosing ownership of 6,120 shares of Builders FirstSource, Inc. (MX:BLDR) valued at $503,859 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 13,825 shares of Builders FirstSource, Inc.. This represents a change in shares of -55.73% 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)
2026-05-13 2026-03-31 13F/A-1 BUILDERS FIRSTSOURCE COM 12008R107 6,120 -7,705 -55.73 504 -64.63 0.1011
2026-04-23 2026-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 15,102 1,277 1,243 0.1023
2026-02-17 2025-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 13,825 -1,343 -8.85 1,422 -22.68 0.1280
2025-10-15 2025-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 15,168 2,790 22.54 1,839 27.35 0.1790
2025-07-24 2025-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 12,378 -646 -4.96 1,444 -11.25 0.1573
2025-06-03 2025-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 13,024 1,045 8.72 1,627 -4.96 0.1934
2025-01-17 2024-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 11,979 -209 -1.71 1,712 -27.52 0.1916
2024-10-10 2024-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 12,188 -1,868 -13.29 2,363 21.44 0.2417
2024-08-12 2024-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 14,056 -836 -5.61 1,945 -37.36 0.2242
2024-05-07 2024-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 14,892 -4,034 -21.31 3,106 -1.71 0.3178
2024-02-12 2023-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 18,926 -10,507 -35.70 3,160 -13.78 0.3475
2023-10-26 2023-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 29,433 -15,792 -34.92 3,664 -40.42 0.4678
2023-07-31 2023-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 45,225 16,273 56.21 6,151 139.30 0.7440
2023-04-24 2023-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 28,952 5,670 24.35 2,570 70.20 0.3271
2023-01-26 2022-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 23,282 9,707 71.51 1,511 88.75 0.1944
2022-11-07 2022-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 13,575 9,645 245.42 800 279.15 0.1130
2022-08-10 2022-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 3,930 328 9.11 211 -9.05 0.0280
2022-04-21 2022-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 3,602 691 23.74 232 -7.20 0.0268
2022-02-14 2021-12-31 13F/A-1 BUILDERS FIRSTSOURCE COM 12008R107 2,911 -1,379 -32.14 250 12.61 0.0287
2021-11-09 2021-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 4,290 -4,488 -51.13 222 -40.64 0.0281
2021-08-10 2021-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 8,778 266 3.12 374 -5.32 0.0492
2021-04-30 2021-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 8,512 8,512 395 0.0606
2021-02-12 2020-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 0 -6,696 -100.00 0 -100.00
2020-11-16 2020-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 6,696 6,696 218 0.0600
2019-11-13 2019-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 0 -10,951 -100.00 0 -100.00
2019-07-16 2019-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 10,951 -1,229 -10.09 185 14.20 0.0778
2019-05-16 2019-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 12,180 12,180 162 0.0752
2019-02-22 2018-03-31 13F/A-1 Builders FirstSource COM 12008R107 0 -2,838 -100.00 0 -100.00
2019-02-21 2017-12-31 13F/A-1 BUILDERS FIRSTSOURCE COM 12008R107 2,838 2,838 62 0.0527
2018-02-15 2017-12-31 13F Builders FirstSource COM 12008R107 2,838 62 0.0494
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.