SES director granted 141,593 RSUs

Luo Eric reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Luo Eric reported acquisition or exercise transactions in this Form 4 filing.

SES AI Corp director Eric Luo received a grant of restricted stock units representing 141,593 shares of Class A Common Stock. The RSUs were granted at no cash cost to him under the company’s 2021 Incentive Award Plan.

The award will vest in full on the first anniversary of the May 18, 2026 grant date, provided he continues to serve through that vesting date. Following this grant, Luo beneficially owns 524,993 shares of Class A Common Stock directly, giving him a larger equity stake tied to the company’s future performance.

Insider Trade Summary

Grant/Award: 141,593 shares

Grant/Award 1 txn

Insider Luo Eric

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

RSU grant size: 141,593 shares Post-grant holdings: 524,993 shares Grant price: $0.0000 per share +2 more

5 metrics

RSU grant size 141,593 shares Restricted stock units granted on May 18, 2026

Post-grant holdings 524,993 shares Total Class A Common Stock held after transaction

Grant price $0.0000 per share Reported transaction price for RSU grant

Vesting schedule 1-year cliff vesting RSUs vest on first anniversary of May 18, 2026 grant date

Transaction direction Acquisition Grant/award acquisition of non-derivative Class A Common Stock

Key Terms

restricted stock units, 2021 Incentive Award Plan, Class A Common Stock, vest in full

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.

vest in full financial

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

FAQ

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

What did SES (SES) director Eric Luo report in this Form 4 filing?

Eric Luo reported receiving a grant of 141,593 restricted stock units tied to SES AI Corp Class A Common Stock. The award was issued at no cash cost as equity compensation under the company’s 2021 Incentive Award Plan.

How many SES (SES) shares does Eric Luo hold after this RSU grant?

After the grant, Eric Luo beneficially owns 524,993 shares of SES AI Corp Class A Common Stock. This figure reflects his direct ownership position reported in the Form 4 following the 141,593-share RSU award.

When do Eric Luo’s newly granted SES (SES) RSUs vest?

The granted RSUs vest in full on the first anniversary of the May 18, 2026 grant date. Vesting is contingent on Eric Luo’s continued service with SES AI Corp through that one-year vesting date.

What security type did Eric Luo receive from SES (SES) in this transaction?

He received restricted stock units representing SES AI Corp Class A Common Stock. Each RSU will convert into one share of Class A Common Stock upon vesting, aligning his compensation with future company performance.

Was Eric Luo’s SES (SES) RSU grant an open-market purchase or compensation award?

The transaction was a compensation-related grant or award acquisition, not an open-market purchase. The Form 4 classifies it under a grant/award code, with a reported price of $0.0000 per share for the RSUs.

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^*

Luo Eric

(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)