AVTR · Avantor, Inc.

Represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of RSUs.

Represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of RSUs.

Represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of RSUs.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $8.30 to $8.32, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each price within the range set forth above.

By a trust of which the reporting person serves as trustee and is a beneficiary. The reporting person disclaims beneficial ownership except to the extent of his pecuniary interest therein.

Reflects a grant of restricted stock units that vests on May 07, 2027.

Reflects a grant of restricted stock units that vests on May 7, 2027.

Reflects a grant of restricted stock units that vests on May 07, 2027.

Reflects a grant of restricted stock units that vests on May 7, 2027.

Reflects a grant of restricted stock units that vests on May 7, 2027.

Reflects a grant of restricted stock units that vests on May 07, 2027.

Reflects a grant of restricted stock units that vests on May 07, 2027.

Reflects a grant of restricted stock units that vests on May 07, 2027.

Reflects a grant of restricted stock units that vest in three equal annual installments beginning on May 1, 2027.

Reflects a grant of stock options that vest in three equal annual installments beginning on May 1, 2027.

Reflects a grant of restricted stock units that vest in three equal annual installments beginning on April 3, 2027.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $7.98 to $8.05, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each price within the range set forth above.

The Reporting Person disclaims beneficial ownership of the securities reported herein as indirectly beneficially owned, except to the extent of any pecuniary interest therein.

Represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of RSUs.

Represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of RSUs.

Represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of RSUs.

Represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of RSUs.

Represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of RSUs.

Represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of RSUs.

Represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of RSUs.

Represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of RSUs.

Represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of RSUs.

Represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of RSUs.

Represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of RSUs.

Represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of RSUs.

Represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of RSUs.

Reflects a grant of stock options that vest in three equal annual installments beginning on February 19, 2027.

Reflects a grant of stock options that vest in three equal annual installments beginning on February 19, 2027.

Reflects a grant of restricted stock units that vest in three equal annual installments beginning on February 19, 2027.

Reflects a grant of restricted stock units that vest in three equal annual installments beginning on February 19, 2027.

Reflects a grant of stock options that vest in three equal annual installments beginning on February 19, 2027.

Reflects a grant of stock options that vest in three equal annual installments beginning on February 19, 2027.

Reflects a grant of stock options that vest in three equal annual installments beginning on February 19, 2027.

Reflects a grant of restricted stock units that vest in three equal annual installments beginning on February 19, 2027.

Reflects a grant of restricted stock units that vest in three equal annual installments beginning on February 19, 2027.

Reflects a grant of restricted stock units that vest in three equal annual installments beginning on February 19, 2027.

Reflects a grant of restricted stock units that vest in three equal annual installments beginning on February 19, 2027.

Reflects a grant of restricted stock units that vest in three equal installments beginning on February 19, 2027.

Reflects a grant of stock options that vest in three equal installments beginning on February 19, 2027.

Reflects a grant of stock options that vest in three equal annual installments beginning on February 19, 2027.

Reflects a grant of stock options that vest in three equal annual installments beginning on February 19, 2027.

Reflects a grant of restricted stock units that vest in three equal annual installments beginning on February 19, 2027.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $9.06 to $9.25, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each price within the range set forth above.

By a trust of which the reporting person serves as trustee and is a beneficiary. The reporting person disclaims beneficial ownership except to the extent of his pecuniary interest therein.

By a trust. The reporting person reports beneficial ownership of AVTR common stock held by the trust but disclaims beneficial ownership except to the extent of his pecuniary interest therein.

Reflects a grant of restricted stock units that vests on May 6, 2026.