ALEXANDER MARK A - Insider Non-Derivative Transactions at Builders FirstSource, Inc. (BLDR) - (SEC)
Updated on January 3, 2026.
According to recent SEC insider information filed on Dec 1, 2025, ALEXANDER MARK A's relationship to Builders FirstSource, Inc. (BLDR) is Director, and currently has 44,647 shares of Common Stock, par value $0.01 per share.
The chart below shows the number of shares owned, and the table shows the recent insider transactions.
You can see similar information for other BLDR insiders.
Related Topics: SEC Topic List.
Data Source: SEC.
ALEXANDER MARK A - Insider Non-Derivative Transactions of BLDR Common Stock, par value $0.01 per share
ALEXANDER MARK A - Insider Non-Derivative Transactions at BLDR
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| Date | Transaction | No. of Shares | Price Per Share | Shares Owned After Transactions |
|---|---|---|---|---|
| Dec 2, 2025 | Acquisition -- (Common Stock, par value $0.01 per share) | 278 | 112.23 | 44647 |
| Sep 2, 2025 | Acquisition -- (Common Stock, par value $0.01 per share) | 225 | 138.68 | 44369 |
| Jun 2, 2025 | Acquisition -- (Common Stock, par value $0.01 per share) | 290 | 107.68 | 44144 |
| May 28, 2025 | Acquisition -- (Common Stock, par value $0.01 per share) | 1707 | 0 | 43854 |
| Mar 2, 2025 | Acquisition -- (Common Stock, par value $0.01 per share) | 224 | 138.99 | 42147 |
| Mar 1, 2025 | Acquisition -- (Common Stock, par value $0.01 per share) | 224 | 138.99 | 42147 |
| Dec 2, 2024 | Acquisition -- (Common Stock, par value $0.01 per share) | 167 | 186.47 | 41923 |
| Sep 2, 2024 | Acquisition -- (Common Stock, par value $0.01 per share) | 179 | 174 | 41756 |
| Jun 5, 2024 | Acquisition -- (Common Stock, par value $0.01 per share) | 1194 | 0 | 41577 |
| Jun 2, 2024 | Acquisition -- (Common Stock, par value $0.01 per share) | 194 | 160.79 | 40383 |
| Mar 2, 2024 | Acquisition -- (Common Stock, par value $0.01 per share) | 156 | 199.98 | 40189 |
| Dec 2, 2023 | Acquisition -- (Common Stock, par value $0.01 per share) | 224 | 139.28 | 40033 |
| Sep 2, 2023 | Acquisition -- (Common Stock, par value $0.01 per share) | 210 | 148.74 | 39809 |
| Jun 15, 2023 | Acquisition -- (Common Stock, par value $0.01 per share) | 1446 | 0 | 39599 |
| Jun 2, 2023 | Acquisition -- (Common Stock, par value $0.01 per share) | 269 | 115.86 | 38153 |
| Mar 2, 2023 | Acquisition -- (Common Stock, par value $0.01 per share) | 306 | 85.76 | 37884 |
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