X0508 4 2025-12-15 0001819142 SES AI Corp SES 0001907008 Gan Hong C/O SES AI CORPORATION 35 CABOT ROAD WOBURN MA 01801 false true false false CHIEF SCIENCE OFFICER 1 Class A Common Stock 2025-12-15 4 M 0 93277 0.15 A 1346563 D Class A Common Stock 2025-12-15 4 M 0 6723 0.16 A 1353286 D Class A Common Stock 2025-12-15 4 S 0 100000 1.9789 D 1253286 D Stock Option (Right to Buy) 0.15 2025-12-15 4 M 0 93277 0 D 2029-03-13 Class A Common Stock 93277 0 D Stock Option (Right to Buy) 0.16 2025-12-15 4 M 0 6723 0 D 2031-02-09 Class A Common Stock 6723 1179832 D 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 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. Reflects fully vested options granted on March 14, 2019. Reflects fully vested options granted on February 10, 2021. /s/ Kyle Pilkington, Attorney-in-Fact 2025-12-16