SES AI CFO granted 331,858 RSUs

Liu Yi Ray reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Liu Yi Ray reported acquisition or exercise transactions in this Form 4 filing.

SES AI Corp reported a compensation-related stock grant to its Chief Financial Officer, Liu Yi Ray. On May 18, 2026, he was awarded 331,858 shares of Class A common stock underlying restricted stock units at a grant price of $0.00 per share. These RSUs vest in three equal installments on the first, second and third anniversaries of the grant date, conditioned on continued employment or service. All 331,858 shares are shown as directly owned after the transaction but remain subject to forfeiture until they vest.

Insider Trade Summary

Grant/Award: 331,858 shares

Grant/Award 1 txn

Insider Liu Yi Ray

Role CHIEF FINANCIAL OFFICER

Type	Security	Shares	Price	Value
Grant/Award	Class A Common Stock	331,858	$0.00	$0.00

Holdings After Transaction: Class A Common Stock — 331,858 shares (Direct)

Footnotes (2)

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, 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.
2. F2. Includes 331,858 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.

Key Figures

RSUs granted: 331,858 shares Grant price: $0.00 per share Shares held after grant: 331,858 shares +1 more

4 metrics

RSUs granted 331,858 shares Class A Common Stock RSUs granted on May 18, 2026

Grant price $0.00 per share Equity compensation, not open-market purchase

Shares held after grant 331,858 shares Direct Class A Common Stock holdings following transaction

Vesting schedule 3 equal annual installments On first, second and third anniversaries of May 18, 2026

Key Terms

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

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.

2021 Incentive Award Plan financial

"granted to the reporting person ... 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.

vesting financial

"The RSUs will vest ... in three equal installments"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

FAQ

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

What insider transaction did SES (SES) report for its CFO?

SES AI Corp reported that CFO Liu Yi Ray received 331,858 shares of Class A common stock underlying restricted stock units. The grant was made as equity compensation with a grant price of $0.00 per share, not as an open-market purchase.

When do Liu Yi Ray’s SES (SES) RSUs vest?

The RSUs granted to Liu Yi Ray vest in three equal installments on the first, second and third anniversaries of May 18, 2026. Each vesting event requires his continued employment or service with SES AI Corp through the applicable vesting date.

How many SES (SES) shares does the CFO hold after this Form 4?

After this transaction, Liu Yi Ray is reported as directly holding 331,858 shares of Class A common stock underlying RSUs. These shares are subject to forfeiture until the restricted stock units vest according to the three-year vesting schedule.

Is the SES (SES) Form 4 transaction a stock purchase or a grant?

The Form 4 reflects a stock grant, not a market purchase. Liu Yi Ray acquired 331,858 shares underlying restricted stock units at a price of $0.00 per share as part of SES AI Corp’s 2021 Incentive Award Plan.

What plan governs the SES (SES) RSU grant to the CFO?

The RSU grant to Liu Yi Ray was made under SES AI Corp’s 2021 Incentive Award Plan. The plan provides for equity-based awards such as restricted stock units, which in this case vest over three years subject to continued employment or service.

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^*

Liu Yi Ray

(Last) (First) (Middle)

C/O SES AI CORPORATION

35 CABOT RD

(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)

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

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)		331,858	A	$0	331,858(2)	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, 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.

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

	/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)