Builders FirstSource, Inc.
US ˙ NYSE ˙ US12008R1077

SecurityBLDR / Builders FirstSource, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership410,240 shares
Latest Disclosed Value $ 33,775,059
Citigroup Inc ownership in BLDR / Builders FirstSource, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 410,240 shares of Builders FirstSource, Inc. (US:BLDR) valued at $33,775,059 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 359,220 shares of Builders FirstSource, Inc.. This represents a change in shares of 14.20% during the quarter. The current value of the position is $30,464,422 USD.

Citigroup Inc 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 0 of underlying shares valued at $0 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.

Upgrade to unlock premium data and export to Excel .

Institutional Put/Call Ratios
(Premium Subscription Required)

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.

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)
2026-05-11 2026-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 410,240 51,020 14.20 33,775 -8.62 0.0072
2026-02-13 2025-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 359,220 81,195 29.20 36,960 9.64 0.0163
2025-11-10 2025-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 278,025 -130,473 -31.94 33,711 -29.28 0.0150
2025-08-11 2025-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 408,498 191,843 88.55 47,668 76.10 0.0234
2025-05-12 2025-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 216,655 -86,819 -28.61 27,069 -37.60 0.0138
2025-02-12 2024-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 303,474 146,275 93.05 43,376 42.33 0.0257
2024-11-12 2024-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 157,199 3,022 1.96 30,475 42.81 0.0177
2024-08-12 2024-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 154,177 -452 -0.29 21,340 -33.83 0.0137
2024-05-10 2024-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 154,629 26,890 21.05 32,248 51.22 0.0212
2024-02-09 2023-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 127,739 -1,216 -0.94 21,325 32.83 0.0150
2023-12-06 2023-09-30 13F/A-1 BUILDERS FIRSTSOURCE COM 12008R107 128,955 -153,530 -54.35 16,054 -58.21 0.0120
2023-11-09 2023-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 128,955 -153,530 16,054 0.0048
2023-08-10 2023-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 282,485 149,022 111.66 38,418 224.25 0.0252
2023-05-11 2023-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 133,463 -78,821 -37.13 11,849 -13.97 0.0083
2023-02-09 2022-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 212,284 -13,768 -6.09 13,773 3.40 0.0110
2022-11-10 2022-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 226,052 144,375 176.76 13,319 203.74 0.0095
2022-08-10 2022-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 81,677 -4,896 -5.66 4,385 -21.51 0.0033
2022-05-12 2022-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 86,573 -2,663 -2.98 5,587 -26.95 0.0034
2022-02-10 2021-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 89,236 -17,432 -16.34 7,648 38.58 0.0041
2021-11-10 2021-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 106,668 -13,524 -11.25 5,519 7.65 0.0033
2021-08-10 2021-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 120,192 11,448 10.53 5,127 1.69 0.0031
2021-05-13 2021-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 108,744 -19,441 -15.17 5,042 -3.61 0.0033
2021-02-11 2020-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 128,185 8,100 6.75 5,231 33.51 0.0031
2020-11-12 2020-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 120,085 -97 -0.08 3,918 57.48 0.0026
2020-08-12 2020-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 120,182 39,159 48.33 2,488 151.06 0.0019
2020-05-12 2020-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 81,023 -38,145 -32.01 991 -67.27 0.0009
2020-02-12 2019-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 119,168 81,150 213.45 3,028 287.21 0.0022
2019-11-08 2019-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 38,018 -20,123 -34.61 782 -20.29 0.0006
2019-08-12 2019-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 58,141 4,942 9.29 981 38.36 0.0008
2019-05-13 2019-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 53,199 3,628 7.32 709 31.05 0.0007
2019-02-12 2018-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 49,571 27,285 122.43 541 64.94 0.0005
2018-11-13 2018-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 22,286 -28,706 -56.30 328 -64.81 0.0003
2018-08-10 2018-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 50,992 -3,143 -5.81 932 -13.14 0.0009
2018-05-11 2018-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 54,135 23,046 74.13 1,073 58.49 0.0009
2018-02-12 2017-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 31,089 9,998 47.40 677 78.16 0.0005
2017-11-13 2017-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 21,091 10,903 107.02 380 143.59 0.0003
2017-08-11 2017-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 10,188 -6,851 -40.21 156 -38.58 0.0001
2017-05-12 2017-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 17,039 -57,069 -77.01 254 -68.72 0.0002
2017-02-10 2016-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 74,108 60,628 449.76 812 423.87 0.0007
2016-11-10 2016-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 13,480 6,252 86.50 155 91.36 0.0001
2016-08-12 2016-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 7,228 -29,229 -80.17 81 -80.29 0.0001
2016-05-13 2016-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 36,457 19,580 116.02 411 119.79 0.0005
2016-02-12 2015-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 16,877 15,281 957.46 187 835.00 0.0002
2015-11-13 2015-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 1,596 -780 -32.83 20 -33.33 0.0000
2015-08-13 2015-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 2,376 -8,736 -78.62 30 -59.46 0.0000
2015-05-14 2015-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 11,112 -6,999 -38.65 74 -40.32 0.0001
2015-02-17 2014-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 18,111 10,624 141.90 124 202.44 0.0001
2014-11-14 2014-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 7,487 2,093 38.80 41 2.50 0.0000
2014-08-14 2014-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 5,394 -14,187 -72.45 40 -77.53 0.0000
2014-05-15 2014-03-31 13F BUILDERS FIRSTSOURCE COM 12008R107 19,581 -9,931 -33.65 178 -15.64 0.0002
2014-02-14 2013-12-31 13F BUILDERS FIRSTSOURCE COM 12008R107 29,512 13,762 87.38 211 129.35 0.0002
2013-11-14 2013-09-30 13F BUILDERS FIRSTSOURCE COM 12008R107 15,750 -1,934 -10.94 92 -12.38 0.0001
2013-08-14 2013-06-30 13F BUILDERS FIRSTSOURCE COM 12008R107 17,684 17,684 105 0.0001
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
(%)
2024-05-10 2024-03-31 13F BUILDERS FIRSTSOURCE COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2024-02-09 2023-12-31 13F BUILDERS FIRSTSOURCE COM Call 60,000 -39.70 10,016 -19.13 n/a n/a n/a
2023-12-06 2023-09-30 13F/A BUILDERS FIRSTSOURCE COM Call 99,500 -0.50 12,387 -8.93 n/a n/a n/a
2023-11-09 2023-09-30 13F BUILDERS FIRSTSOURCE COM Call 99,500 12,387 n/a n/a n/a
2023-08-10 2023-06-30 13F BUILDERS FIRSTSOURCE COM Call 100,000 13,600 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
(%)
2024-08-12 2024-06-30 13F BUILDERS FIRSTSOURCE COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2024-05-10 2024-03-31 13F BUILDERS FIRSTSOURCE COM Put 100,000 -71.43 20,855 -64.31 n/a n/a n/a
2024-02-09 2023-12-31 13F BUILDERS FIRSTSOURCE COM Put 350,000 58,429 n/a n/a n/a
2023-12-06 2023-09-30 13F/A BUILDERS FIRSTSOURCE COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2023-11-09 2023-09-30 13F BUILDERS FIRSTSOURCE COM Put 0 0 n/a n/a n/a
2023-08-10 2023-06-30 13F BUILDERS FIRSTSOURCE COM Put 135,000 -10.00 18,360 37.87 n/a n/a n/a
2023-05-11 2023-03-31 13F BUILDERS FIRSTSOURCE COM Put 150,000 13,317 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.