Chao John Tsung-chen 4

What Happened
John Tsung-chen Chao, a director of Westlake Corp (WLK), had 570 restricted stock units (RSUs) vest and convert into 570 shares of common stock on February 17, 2026 (exercise/conversion of a derivative). To satisfy tax withholding on the vesting, 242 of those shares were withheld on February 18, 2026 at an effective price of $98.95 per share, a withholding value of $23,946. The RSU grant was originally made on February 17, 2023 and vested on its third anniversary.

Key Details

• Transaction dates: RSU conversion on 2026-02-17; tax withholding (shares surrendered) on 2026-02-18.
• Conversion: 570 RSUs → 570 shares (code M: exercise/conversion of derivative) at $0.00 exercise price.
• Tax withholding (code F): 242 shares surrendered at $98.95 each, total $23,946.
• Footnotes: RSUs convert one-for-one into common stock (F1); the RSUs were granted 2026-02-17 with a 3-year vesting from 2023-02-17 (F2); shares were withheld to satisfy tax obligations (F3).
• Ownership note: Filing states a reconciliation added 400 shares that had been omitted from prior Form 4s (F4). The filing does not change that the 242-share withholding was for taxes.
• Filing: Report filed 2026-02-19 for the 2026-02-17 transaction (appears to be timely).

Context
This was a scheduled RSU vesting and a routine cashless-type withholding to meet tax obligations — not an open-market sale or discretionary purchase. The reporting codes show conversion of RSUs into common stock (M) and shares withheld for taxes (F). Such tax-withholding dispositions are common and generally reflect withholding mechanics rather than an active decision to sell shares on the market.