Ralston Dianne B. 4

What Happened

• Dianne B. Ralston, Chief Legal Officer & Secretary of SLB (ticker: SLB), had 47,437 shares issued to her on Jan 23, 2026 upon vesting of performance share units (PSUs). To satisfy tax withholding, 17,667 shares were surrendered on Jan 23 at an effective value of $50.25 per share ($887,767). Separately, 18,617 shares were sold in the open market on Jan 26 at $49.50 per share, generating $921,542. In total, 36,284 shares were disposed for about $1,809,309 following the PSU vesting.

Key Details

• Award/vesting: 47,437 shares issued (A) on 2026-01-23 (per footnote: PSUs granted Jan 18, 2023 vested upon achievement of performance criteria).
• Tax withholding: 17,667 shares surrendered (F) on 2026-01-23 at $50.25/share = $887,767.
• Open-market sale: 18,617 shares sold (S) on 2026-01-26 at $49.50/share = $921,542.
• Total shares disposed: 36,284; total value of disposed shares ≈ $1,809,309.
• Shares owned after the transactions: not specified in the provided filing excerpt.
• Filing: Form 4 filed 2026-01-27 for transactions dated Jan 23 and Jan 26 — filing appears timely under Form 4 rules.
• Footnote: The issued shares were performance share units that vested after meeting performance criteria (PSUs originally granted Jan 18, 2023).

Context

• This was primarily an award vesting event followed by routine tax-withholding and an open-market sale. The surrender of shares to cover tax obligations (code F) is common after equity vesting; the additional open-market sale (code S) represents a sale of vested shares rather than a separate purchase or speculative trade. Such transactions are often administrative and do not necessarily signal a change in the insider’s long-term view.