A Form 4 filed on August 18, 2026 with the U.S. Securities and Exchange Commission discloses that Brittany Hankamer, Executive Vice President and Chief HR Officer of Avantor, Inc. (NYSE:AVTR), had 181 shares of common stock withheld by the issuer on August 14, 2026 to satisfy tax obligations connected to the vesting of restricted stock units.

Key Highlights

  • Reporting person: Brittany Hankamer, EVP and Chief HR Officer of Avantor, Inc.
  • Transaction date: August 14, 2026
  • Shares withheld: 181 shares of common stock disposed of (code F) at $13.66 per share
  • Purpose: Shares withheld by the issuer to cover tax withholding obligations in connection with RSU vesting, per the filing's footnote
  • Beneficial ownership after transaction: 248,864 shares of common stock held directly
  • Filing signed: By Scott Baker, by power of attorney for Brittany Hankamer, on August 18, 2026

Avantor Chief HR Officer Reports RSU-Related Share Withholding

According to the Form 4 filing, Brittany Hankamer, who serves as Executive Vice President and Chief HR Officer at Avantor, Inc. (NYSE:AVTR), reported a single transaction in non-derivative securities. On August 14, 2026, 181 shares of Avantor common stock were disposed of under transaction code F at a price of $13.66 per share. The filing's footnote states that this disposal "represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of RSUs."

Following the reported transaction, the filing discloses that Hankamer directly holds 248,864 shares of Avantor common stock. No derivative securities transactions were reported in Table II of the filing. The filing was made by one reporting person and was not identified as an amendment to a previously filed form.

The Form 4 was signed by Scott Baker acting by power of attorney for Brittany Hankamer on August 18, 2026. No Rule 10b5-1(c) plan box was checked in connection with this transaction, and no indirect beneficial ownership was reported.

What Was Disclosed

Avantor EVP and Chief HR Officer Brittany Hankamer disclosed a tax-withholding disposition of 181 shares of common stock at $13.66 on August 14, 2026, related to RSU vesting, leaving her with direct beneficial ownership of 248,864 shares.