SES AI CTO granted 221,239 restricted stock units

SES AI Corp reported that Chief Technology Officer Xu Kang acquired 221,239 shares of Class A Common Stock through a grant of restricted stock units on May 18, 2026 under the company’s 2021 Incentive Award Plan.

Rhea-AI Filing Summary

SES AI Corp reported that Chief Technology Officer Xu Kang acquired 221,239 shares of Class A Common Stock through a grant of restricted stock units on May 18, 2026 under the company’s 2021 Incentive Award Plan. The RSUs were granted at a price of $0.00 per share.

The RSUs will vest, and an equal number of shares will be delivered, in three equal installments on the first, second and third anniversaries of the grant date, subject to continued employment or service. Following this award, Xu Kang directly holds 801,635 shares of Class A Common Stock, including 537,894 shares underlying RSUs that remain subject to forfeiture until they vest.

Insider Trade Summary

Grant/Award: 221,239 shares

Grant/Award 1 txn

Insider Xu Kang

Role CHIEF TECHNOLOGY OFFICER

Type	Security	Shares	Price	Value
Grant/Award	Class A Common Stock	221,239	$0.00	$0.00

Holdings After Transaction: Class A Common Stock — 801,635 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 537,894 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

Key Figures

RSU grant size: 221,239 shares Grant price: $0.00 per share Post-transaction holdings: 801,635 shares +3 more

6 metrics

RSU grant size 221,239 shares Class A Common Stock underlying RSUs granted on May 18, 2026

Grant price $0.00 per share Restricted stock units awarded under 2021 Incentive Award Plan

Post-transaction holdings 801,635 shares Class A Common Stock held directly after the RSU grant

Unvested RSU underlying shares 537,894 shares Class A Common Stock underlying RSUs subject to forfeiture until vesting

Par value per share $0.0001 per share Class A Common Stock par value referenced in RSU footnote

Vesting schedule 3 equal installments First, second and third anniversaries of May 18, 2026 grant date

Key Terms

restricted stock units, 2021 Incentive Award Plan, Class A Common Stock, subject to forfeiture

4 terms

restricted stock units financial

"Represents shares of Class A common stock ... 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

"RSUs ... 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"), underlying restricted stock units..."

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.

subject to forfeiture financial

"Includes 537,894 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest."

FAQ

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

What insider transaction did SES (SES) Chief Technology Officer Xu Kang report?

Xu Kang reported an acquisition of 221,239 shares of SES AI Corp Class A Common Stock via a grant of restricted stock units on May 18, 2026. The award was made under the 2021 Incentive Award Plan at a grant price of $0.00 per share.

How many SES (SES) shares were granted to Xu Kang in the latest Form 4?

Xu Kang was granted restricted stock units underlying 221,239 shares of SES AI Corp Class A Common Stock. These RSUs vest in three equal installments on the first, second and third anniversaries of the May 18, 2026 grant date, subject to continued employment or service.

What is the vesting schedule of Xu Kang’s new SES (SES) restricted stock units?

The restricted stock units granted to Xu Kang vest in three equal installments on the first, second and third anniversaries of the May 18, 2026 grant date. On each vesting date, an equal number of Class A Common shares will be delivered, assuming continued employment or service.

How many SES (SES) shares does Xu Kang hold after this RSU grant?

After the reported transaction, Xu Kang directly holds 801,635 shares of SES AI Corp Class A Common Stock. This total includes 537,894 shares underlying restricted stock units that are still subject to forfeiture until the applicable vesting conditions are satisfied over time.

Are Xu Kang’s SES (SES) restricted stock units subject to forfeiture?

Yes. The filing notes that 537,894 shares of Class A Common Stock are underlying restricted stock units subject to forfeiture until they vest. Vesting depends on continued employment or service through each applicable vesting date specified in the award’s three-year schedule.

Under which plan were Xu Kang’s SES (SES) restricted stock units granted?

The restricted stock units reported in the Form 4 were granted to Xu Kang under SES AI Corp’s 2021 Incentive Award Plan. This plan governs equity-based compensation, including RSUs that convert into shares of Class A Common Stock as vesting conditions are met over time.

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^*

Xu Kang

(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 TECHNOLOGY 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)		221,239(1)	A	$0	801,635(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 537,894 shares of Class A Common Stock underlying restricted stock units, 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)