Builders FirstSource, Inc.
MX ˙ BMV ˙ US12008R1077
SecurityMX:BLDR / Builders FirstSource, Inc.
InstitutionCapital Fund Management S.a.
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
Capital Fund Management S.a. ownership in BLDR / Builders FirstSource, Inc.

On November 13, 2025 - Capital Fund Management S.a. filed a 13F-HR form disclosing ownership of 0 shares of Builders FirstSource, Inc. (MX:BLDR) valued at $0 USD as of September 30, 2025. The entity filed a previous 13F-HR on August 13, 2025 disclosing 49,428 shares of Builders FirstSource, Inc.. This represents a change in shares of -100.00% during the quarter.

Capital Fund Management S.a. has a history of taking positions in derivatives of the underlying security (BLDR) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD and put options representing 21,800 of underlying shares valued at $1,794,794 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:BLDR / Builders FirstSource, Inc. Historical Put/Call Ratio
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)
2025-11-13 2025-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 0 -49,428 -100.00 0 -100.00
2025-08-13 2025-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 49,428 49,428 5,768 0.0159
2025-05-14 2025-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 0 -60,238 -100.00 0 -100.00
2025-02-13 2024-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 60,238 60,238 8,610 0.0220
2024-08-13 2024-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 0 -37,265 -100.00 0 -100.00
2024-05-15 2024-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 37,265 -96,082 -72.05 7,772 -65.09 0.0225
2024-02-14 2023-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 133,347 -143,046 -51.75 22,261 -35.31 0.0598
2023-11-14 2023-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 276,393 211,831 328.10 34,408 291.89 0.1189
2023-08-14 2023-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 64,562 64,562 8,780 0.0356
2021-02-12 2020-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 0 -57,459 -100.00 0 -100.00
2020-11-13 2020-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 57,459 -20,827 -26.60 1,874 15.68 0.0231
2020-08-13 2020-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 78,286 -71,812 -47.84 1,621 -11.76 0.0257
2020-05-13 2020-03-31 13F Builders FirstSource COM 12008R107 150,098 99,100 194.32 1,836 41.67 0.0284
2020-02-13 2019-12-31 13F Builders FirstSource COM 12008R107 50,998 38,799 318.05 1,296 416.33 0.0102
2019-11-13 2019-09-30 13F Builders FirstSource COM 12008R107 12,199 -6,301 -34.06 251 -19.55 0.0023
2019-08-12 2019-06-30 13F Builders FirstSource COM 12008R107 18,500 -1,900 -9.31 312 14.71 0.0028
2019-05-13 2019-03-31 13F/A-1 Builders FirstSource COM 12008R107 20,400 20,400 272 0.0024
2018-11-14 2018-09-30 13F Builders FirstSource COM 12008R107 0 -25,700 -100.00 0 -100.00
2018-08-14 2018-06-30 13F Builders FirstSource COM 12008R107 25,700 10,000 63.69 470 51.13 0.0025
2018-05-15 2018-03-31 13F Builders FirstSource COM 12008R107 15,700 15,700 311 0.0019
2017-05-03 2017-03-31 13F Builders FirstSource COM 12008R107 0 -27,300 -100.00 0 -100.00
2017-02-08 2016-12-31 13F Builders FirstSource COM 12008R107 27,300 27,300 299 0.0026
2016-07-27 2016-06-30 13F Builders FirstSource COM 12008R107 0 -25,599 -100.00 0 -100.00
2016-05-02 2016-03-31 13F Builders FirstSource COM 12008R107 25,599 25,599 289 0.0028
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-14 2026-03-31 13F BUILDERS FIRSTSOURCE INC COM BUILDERS FIRSTSOURCE INC COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2026-02-17 2025-12-31 13F BUILDERS FIRSTSOURCE INC COM BUILDERS FIRSTSOURCE INC COM Call 41,600 -61.45 4,280 -67.28 n/a n/a n/a
2025-11-13 2025-09-30 13F BUILDERS FIRSTSOURCE COM Call 107,900 8.66 13,083 12.90 n/a n/a n/a
2025-08-13 2025-06-30 13F BUILDERS FIRSTSOURCE COM Call 99,300 11,587 n/a n/a n/a
2025-05-14 2025-03-31 13F BUILDERS FIRSTSOURCE COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-02-13 2024-12-31 13F BUILDERS FIRSTSOURCE COM Call 34,800 21.68 4,974 -10.30 n/a n/a n/a
2024-11-13 2024-09-30 13F BUILDERS FIRSTSOURCE COM Call 28,600 -6.23 5,544 31.34 n/a n/a n/a
2024-08-13 2024-06-30 13F BUILDERS FIRSTSOURCE COM Call 30,500 -18.23 4,222 -45.73 n/a n/a n/a
2024-05-15 2024-03-31 13F BUILDERS FIRSTSOURCE COM Call 37,300 -56.43 7,779 -45.57 n/a n/a n/a
2024-02-14 2023-12-31 13F BUILDERS FIRSTSOURCE COM Call 85,600 38.06 14,290 85.15 n/a n/a n/a
2023-11-14 2023-09-30 13F BUILDERS FIRSTSOURCE COM Call 62,000 -7.88 7,718 -15.67 n/a n/a n/a
2023-08-14 2023-06-30 13F BUILDERS FIRSTSOURCE COM Call 67,300 293.57 9,153 502.90 n/a n/a n/a
2023-05-15 2023-03-31 13F BUILDERS FIRSTSOURCE COM Call 17,100 1,518 n/a n/a n/a
2022-11-14 2022-09-30 13F BUILDERS FIRSTSOURCE COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2022-08-12 2022-06-30 13F BUILDERS FIRSTSOURCE COM Call 18,800 -80.19 1,010 -83.52 n/a n/a n/a
2022-05-12 2022-03-31 13F BUILDERS FIRSTSOURCE COM Call 94,900 46.22 6,125 10.10 n/a n/a n/a
2022-02-10 2021-12-31 13F BUILDERS FIRSTSOURCE COM Call 64,900 5,563 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-14 2026-03-31 13F BUILDERS FIRSTSOURCE INC COM BUILDERS FIRSTSOURCE INC COM Put 21,800 -40.11 1,795 -52.10 n/a n/a n/a
2026-02-17 2025-12-31 13F BUILDERS FIRSTSOURCE INC COM BUILDERS FIRSTSOURCE INC COM Put 36,400 -65.56 3,745 -70.78 n/a n/a n/a
2025-11-13 2025-09-30 13F BUILDERS FIRSTSOURCE COM Put 105,700 1.15 12,816 5.10 n/a n/a n/a
2025-08-13 2025-06-30 13F BUILDERS FIRSTSOURCE COM Put 104,500 12,194 n/a n/a n/a
2025-05-14 2025-03-31 13F BUILDERS FIRSTSOURCE COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2025-02-13 2024-12-31 13F BUILDERS FIRSTSOURCE COM Put 60,000 4.35 8,576 -23.07 n/a n/a n/a
2024-11-13 2024-09-30 13F BUILDERS FIRSTSOURCE COM Put 57,500 34.66 11,147 88.60 n/a n/a n/a
2024-08-13 2024-06-30 13F BUILDERS FIRSTSOURCE COM Put 42,700 -67.72 5,910 -78.58 n/a n/a n/a
2024-05-15 2024-03-31 13F BUILDERS FIRSTSOURCE COM Put 132,300 -22.50 27,591 -3.18 n/a n/a n/a
2024-02-14 2023-12-31 13F BUILDERS FIRSTSOURCE COM Put 170,700 56.89 28,497 110.40 n/a n/a n/a
2023-11-14 2023-09-30 13F BUILDERS FIRSTSOURCE COM Put 108,800 180.41 13,545 156.71 n/a n/a n/a
2023-08-14 2023-06-30 13F BUILDERS FIRSTSOURCE COM Put 38,800 169.44 5,277 312.83 n/a n/a n/a
2023-05-15 2023-03-31 13F BUILDERS FIRSTSOURCE COM Put 14,400 1,278 n/a n/a n/a
2022-11-14 2022-09-30 13F BUILDERS FIRSTSOURCE COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2022-08-12 2022-06-30 13F BUILDERS FIRSTSOURCE COM Put 22,900 -77.55 1,230 -81.33 n/a n/a n/a
2022-05-12 2022-03-31 13F BUILDERS FIRSTSOURCE COM Put 102,000 86.13 6,583 40.18 n/a n/a n/a
2022-02-10 2021-12-31 13F BUILDERS FIRSTSOURCE COM Put 54,800 4,697 n/a n/a n/a
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.