ALEXANDER MARK A 4

What Happened Mark A. Alexander, a director of Builders FirstSource, Inc. (BLDR), was granted 2,558 restricted stock units (RSUs) on May 14, 2026. The grant is reported as an award (Form 4 code A) at $0.00 per unit (no cash paid at grant); the RSUs vest on May 14, 2027 and each vested RSU entitles the holder to one share of common stock.

Key Details

• Transaction date: 2026-05-14. Filing date (Form 4): 2026-05-18 — filing appears timely (filed within the required 2 business days).
• Grant: 2,558 RSUs; reported price $0.00 (award, not a market purchase).
• Vesting: May 14, 2027; each RSU converts to one common share upon vesting (footnote F1).
• Immediate cash value per filing: $0 (award at no cash cost to the recipient).
• Shares owned after transaction: Not specified in the filing.
• Footnote: F1 confirms RSUs are under the 2014 Incentive Plan and vest 5/14/2027, converting 1-for-1 to common stock.

Context Restricted stock unit grants are a common form of director compensation and do not represent an open-market purchase or sale. RSUs are not tradable until they vest and convert to shares; the filing does not indicate any immediate sale or cashless exercise. This award aligns compensation with future equity ownership but, by itself, does not indicate the director’s short-term trading intent.