Jiong Ma - 18 May 2026 Form 4 Insider Report for SES AI Corp (SES)

Reporting relationship: Director
Issuer ticker: SES
Reported as of: 18 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 20 May 2026, 17:30:07 UTC
Prior SEC filing: 02 Apr 2025
Source filing: View source filing
Reporting owner signature: /s/ Kyle Pilkington, Attorney-in-Fact

Key filing fact

Jiong Ma filed Form 4 for SES AI Corp (SES) on 20 May 2026.

Key facts

This page summarizes Jiong Ma's Form 4 filing for SES AI Corp (SES).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 20 May 2026, 17:30.

Change

Previous filing in this sequence was filed on 02 Apr 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001854872 Primary reporting owner

Ma Jiong

Relationship: Director
Address: C/O SES AI CORPORATION, 35 CABOT ROAD, WOBURN
Signature: /s/ Kyle Pilkington, Attorney-in-Fact
Signature date: 20 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

SES transaction

Class A Common Stock

Award

Transaction value
Shares: +141,593
Change %: +37%
Price: $0.000000^*
Shares after: 524,993
Date: 18 May 2026
Ownership: Direct
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

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.