SES AI director awarded 141,593 RSUs

Ma Jiong reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Ma Jiong reported acquisition or exercise transactions in this Form 4 filing.

SES AI Corp director Jiong Ma received a grant of 141,593 shares of Class A Common Stock in the form of restricted stock units (RSUs). The RSUs were granted on May 18, 2026 under the company’s 2021 Incentive Award Plan at a stated price of $0.00 per share.

The RSUs will vest in full on the first anniversary of the grant date, and an equal number of Class A shares will be delivered at that time, subject to Ms. Ma’s continued service. After this award, she directly holds 524,993 shares of Class A Common Stock.

Insider Trade Summary

Grant/Award: 141,593 shares

Grant/Award 1 txn

Insider Ma Jiong

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Class A Common Stock	141,593	$0.00	$0.00

Holdings After Transaction: Class A Common Stock — 524,993 shares (Direct)

Footnotes (1)

1. 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.

Key Figures

RSUs granted: 141,593 shares Transaction price per share: $0.00 per share Shares held after transaction: 524,993 shares +1 more

4 metrics

RSUs granted 141,593 shares Class A Common Stock RSUs granted on May 18, 2026

Transaction price per share $0.00 per share Equity award grant price for RSUs

Shares held after transaction 524,993 shares Director Jiong Ma direct holdings following RSU grant

Vesting schedule 100% after one year RSUs vest in full on first anniversary of Grant Date

Key Terms

restricted stock units, RSUs, 2021 Incentive Award Plan, Class A Common Stock

4 terms

restricted stock units financial

"underlying restricted stock units ("RSUs") granted to the reporting person"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

RSUs financial

"The RSUs will vest in full, and an equal number of shares"

RSUs, or restricted stock units, are a form of company shares given to employees as part of their compensation. They are typically awarded with certain restrictions, such as a waiting period before they can be fully owned or sold, similar to earning a gift that becomes fully yours over time. For investors, RSUs can impact a company's stock offerings and reflect how much the company relies on stock-based incentives to attract and retain talent.

2021 Incentive Award Plan financial

"pursuant to the Issuer's 2021 Incentive Award Plan"

Class A Common Stock financial

"Represents shares of Class A common stock, par value $0.0001 per share"

Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did SES (SES) director Jiong Ma report in this Form 4 filing?

Director Jiong Ma reported receiving a grant of 141,593 restricted stock units representing Class A Common Stock. The award was made under SES AI Corp’s 2021 Incentive Award Plan and increases her direct holdings to 524,993 Class A shares after the transaction.

How many SES (SES) shares were granted to Jiong Ma and at what price?

Jiong Ma was granted 141,593 restricted stock units tied to SES AI Corp Class A Common Stock. The filing lists a transaction price of $0.00 per share, indicating a compensation award rather than an open-market purchase of SES shares.

When do Jiong Ma’s SES (SES) RSUs from this grant vest?

The RSUs granted to Jiong Ma on May 18, 2026 vest in full on the first anniversary of the grant date. On that vesting date, an equal number of SES Class A shares will be delivered, provided she remains in service through vesting.

How many SES (SES) shares does Jiong Ma hold after this RSU grant?

Following the grant of 141,593 restricted stock units, Jiong Ma directly holds 524,993 shares of SES AI Corp Class A Common Stock. This total includes the new award as reported in the Form 4 insider transaction summary for the director.

Under which plan were the new SES (SES) RSUs granted to Jiong Ma?

The 141,593 restricted stock units reported for Jiong Ma were granted under SES AI Corp’s 2021 Incentive Award Plan. This plan provides equity-based compensation, with these RSUs delivering an equal number of Class A shares upon vesting after one year.

Is Jiong Ma’s SES (SES) Form 4 transaction a market purchase or a compensation award?

The Form 4 shows a compensation award, not a market purchase. Code “A” and a price of $0.00 per share indicate 141,593 restricted stock units granted to director Jiong Ma as an equity award under the company’s 2021 Incentive Award Plan.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/20/2026 - 05:30 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Ma Jiong

(Last) (First) (Middle)

C/O SES AI CORPORATION

35 CABOT ROAD

(Street)

WOBURN MASSACHUSETTS 01801

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
SES AI Corp [ SES ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/18/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	05/18/2026		A(1)		141,593(1)	A	$0	524,993	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 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.

	/s/ Kyle Pilkington, Attorney-in-Fact	05/20/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)