SLIETER KELLY 4

What Happened
Kelly Slieter, SVP and Chief HR Officer of AdvanSix (ASIX), had 5,424 shares withheld to satisfy tax withholding obligations related to restricted stock units (RSUs) that vested on February 28, 2026. The withholding was recorded at $17.47 per share, for a total value of approximately $94,757. This was a tax-withholding disposition (routine) rather than an open-market sale or a purchase.

Key Details

• Transaction date: February 28, 2026; Form 4 filed March 3, 2026.
• Transaction code: F (payment of exercise price or tax liability / shares withheld).
• Shares withheld: 5,424 at $17.47 per share; total value ≈ $94,757.
• Shares owned after transaction: Not disclosed in the provided filing.
• Footnote: F1 — shares were withheld to satisfy tax withholding on RSUs that vested 2/28/2026.
• Timeliness: Filing date is 2026-03-03; no late-filing indicator shown in the record.

Context
Withholding shares to cover taxes on vested RSUs is a common, administrative transaction and does not necessarily indicate the insider is selling shares in the open market or signaling a view on the company. Purchases generally carry more informational weight for investors than routine tax-withholdings or dispositions.