SES · SES AI Corp

The sale of Class A Common Stock of the issuer was executed pursuant to a Rule 10b5-1 plan entered into by the Reporting Person on November 12, 2025.

The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.20 to $1.21, inclusive. The Reporting Person undertakes to provide to 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 sold at each separate price within the ranges set forth in this footnote to this Form 4.

Includes 733,646 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.

Represents shares of Class A common stock, par value $0.0001 per share ("Class A Common Stock"), underlying restricted stock units ("RSUs") granted to the reporting person on May 18, 2026 (the "Grant Date") pursuant to the Issuer's 2021 Incentive Award Plan. The RSUs will vest, and an equal number of shares of Class A Common Stock will be deliverable to the reporting person, in three equal installments on the first, second and third anniversaries of the Grant Date, subject to continued employment or service through each applicable vesting date.

Includes 331,858 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.

Represents shares of Class A common stock, par value $0.0001 per share ("Class A Common Stock"), underlying restricted stock units ("RSUs") granted to the reporting person on May 18, 2026 (the "Grant Date") pursuant to the Issuer's 2021 Incentive Award Plan. The RSUs will vest in full, and an equal number of shares of Class A Common Stock will be deliverable to the reporting person, on the first anniversary of the Grant Date, subject to continued service through such vesting date.

Represents shares of Class A common stock, par value $0.0001 per share ("Class A Common Stock"), underlying restricted stock units ("RSUs") granted to the reporting person on May 18, 2026 (the "Grant Date") pursuant to the Issuer's 2021 Incentive Award Plan. The RSUs will vest in full, and an equal number of shares of Class A Common Stock will be deliverable to the reporting person, on the first anniversary of the Grant Date, subject to continued service through such vesting date.

Represents shares of Class A common stock, par value $0.0001 per share ("Class A Common Stock"), underlying restricted stock units ("RSUs") granted to the reporting person on May 18, 2026 (the "Grant Date") pursuant to the Issuer's 2021 Incentive Award Plan. The RSUs will vest in full, and an equal number of shares of Class A Common Stock will be deliverable to the reporting person, on the first anniversary of the Grant Date, subject to continued service through such vesting date.

Represents shares of Class A common stock, par value $0.0001 per share ("Class A Common Stock"), underlying restricted stock units ("RSUs") granted to the reporting person on May 18, 2026 (the "Grant Date") pursuant to the Issuer's 2021 Incentive Award Plan. The RSUs will vest, and an equal number of shares of Class A Common Stock will be deliverable to the reporting person, in three equal installments on the first, second and third anniversaries of the Grant Date, subject to continued employment or service through each applicable vesting date.

Includes 733,646 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.

Represents shares of Class A common stock, par value $0.0001 per share ("Class A Common Stock"), underlying restricted stock units ("RSUs") granted to the reporting person on May 18, 2026 (the "Grant Date") pursuant to the Issuer's 2021 Incentive Award Plan. The RSUs will vest, and an equal number of shares of Class A Common Stock will be deliverable to the reporting person, in three equal installments on the first, second and third anniversaries of the Grant Date, subject to continued employment or service through each applicable vesting date.

Includes 3,497,664 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.

Represents shares of Class A common stock, par value $0.0001 per share ("Class A Common Stock"), underlying restricted stock units ("RSUs") granted to the reporting person on May 18, 2026 (the "Grant Date") pursuant to the Issuer's 2021 Incentive Award Plan. The RSUs will vest, and an equal number of shares of Class A Common Stock will be deliverable to the reporting person, in three equal installments on the first, second and third anniversaries of the Grant Date, subject to continued employment or service through each applicable vesting date.

Includes 537,894 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

Includes 836,871 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

Includes 474,580 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

Includes 1,993,239 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

Includes 379,664 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

Includes 435,453 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

Includes 2,272,184 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

Includes 316,655 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

Includes 906,607 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

Includes 544,316 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

The sale of Class A Common Stock of the issuer was executed pursuant to a Rule 10b5-1 plan entered into by the Reporting Person on November 12, 2025.

Includes 568,785 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

Includes 710,981 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

Includes 568,785 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

Includes 2,972,177 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

Includes 1,223,271 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

Includes 399,988 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

The option exercise and sale of Class A Common Stock of the issuer was executed pursuant to a Rule 10b5-1 plan entered into by the Reporting Person on August 14, 2025.

The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.48 to $2.56, inclusive. The Reporting Person undertakes to provide to 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 sold at each separate price within the ranges set forth in this footnote to this Form 4.

Includes 852,222 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

The option exercise and sale of Class A Common Stock of the issuer was executed pursuant to a Rule 10b5-1 plan entered into by the Reporting Person on August 14, 2025.

Reflects fully vested options granted on February 10, 2021.

The option exercise and sale of Class A Common Stock of the issuer was executed pursuant to a Rule 10b5-1 plan entered into by the Reporting Person on August 14, 2025.

Includes 852,222 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

The option exercise and sale of Class A Common Stock of the issuer was executed pursuant to a Rule 10b5-1 plan entered into by the Reporting Person on August 14, 2025.

The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.48 to $2.53, inclusive. The Reporting Person undertakes to provide to 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 sold at each separate price within the ranges set forth in this footnote to this Form 4.

Includes 852,222 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

The option exercise and sale of Class A Common Stock of the issuer was executed pursuant to a Rule 10b5-1 plan entered into by the Reporting Person on August 14, 2025.

Reflects fully vested options granted on February 10, 2021.

The option exercise and sale of Class A Common Stock of the issuer was executed pursuant to a Rule 10b5-1 plan entered into by the Reporting Person on August 14, 2025.

Includes 852,222 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

The option exercise and sale of Class A Common Stock of the issuer was executed pursuant to a Rule 10b5-1 plan entered into by the Reporting Person on August 14, 2025.

Reflects fully vested options granted on March 14, 2019.

The option exercise and sale of Class A Common Stock of the issuer was executed pursuant to a Rule 10b5-1 plan entered into by the Reporting Person on August 14, 2025.

The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.935 to $2.07, inclusive. The Reporting Person undertakes to provide to 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 sold at each separate price within the ranges set forth in this footnote to this Form 4.

Includes 852,222 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

The option exercise and sale of Class A Common Stock of the issuer was executed pursuant to a Rule 10b5-1 plan entered into by the Reporting Person on August 14, 2025.

Includes 852,222 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

The option exercise and sale of Class A Common Stock of the issuer was executed pursuant to a Rule 10b5-1 plan entered into by the Reporting Person on August 14, 2025.

Reflects fully vested options granted on February 10, 2021.

The option exercise and sale of Class A Common Stock of the issuer was executed pursuant to a Rule 10b5-1 plan entered into by the Reporting Person on August 14, 2025.

Includes 852,222 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

The option exercise and sale of Class A Common Stock of the issuer was executed pursuant to a Rule 10b5-1 plan entered into by the Reporting Person on August 14, 2025.

The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.85 to $1.99, inclusive. The Reporting Person undertakes to provide to 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 sold at each separate price within the ranges set forth in this footnote to this Form 4.

Includes 852,222 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

The option exercise and sale of Class A Common Stock of the issuer was executed pursuant to a Rule 10b5-1 plan entered into by the Reporting Person on August 14, 2025.

Includes 852,222 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

The option exercise and sale of Class A Common Stock of the issuer was executed pursuant to a Rule 10b5-1 plan entered into by the Reporting Person on August 14, 2025.

Reflects fully vested options granted on March 14, 2019.

Represents shares of Class A common stock, par value $0.0001 per share ("Class A Common Stock"), underlying restricted stock units ("RSUs") granted to the reporting person on September 8, 2025 (the "Grant Date") pursuant to the Issuer's 2021 Incentive Award Plan. The RSUs will vest in full, and an equal number of shares of Class A Common Stock will be deliverable to the reporting person, on the first anniversary of the Grant Date, subject to continued service through such vesting date.

Includes 296,296 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

Includes 470,609 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of a restricted share award. These shares were not sold by the Reporting Person.

Includes 1,426,800 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

Includes 681,778 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of a restricted share award. These shares were not sold by the Reporting Person.

Includes 30,900 unvested shares of Class A Common Stock under a restricted share award granted on August 16, 2021. The restricted share award vested 25% on the first anniversary of the grant date and will vest in equal monthly installments over the following 36 months, subject to the reporting person's continued service on each vesting date.

Includes 1,426,800 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of a restricted share award. These shares were not sold by the Reporting Person.

Includes 61,800 unvested shares of Class A Common Stock under a restricted share award granted on August 16, 2021. The restricted share award vested 25% on the first anniversary of the grant date and will vest in equal monthly installments over the following 36 months, subject to the reporting person's continued service on each vesting date.

Includes 1,426,800 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of a restricted share award. These shares were not sold by the Reporting Person.

Includes 92,700 unvested shares of Class A Common Stock under a restricted share award granted on August 16, 2021. The restricted share award vested 25% on the first anniversary of the grant date and will vest in equal monthly installments over the following 36 months, subject to the reporting person's continued service on each vesting date.

Includes 1,426,800 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

Includes 3,565,391 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units. These shares were not sold by the Reporting Person.

Includes 852,222 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

Includes 123,600 unvested shares of Class A Common Stock under a restricted share award granted on August 16, 2021. The restricted share award vested 25% on the first anniversary of the grant date and will vest in equal monthly installments over the following 36 months, subject to the reporting person's continued service on each vesting date.

Includes 1,426,800 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

Includes 694,047 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.