SES AI director granted 141,593 RSUs

Boyd Andrew J reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Boyd Andrew J reported acquisition or exercise transactions in this Form 4 filing.

SES AI Corp director Andrew J. Boyd received a new equity award in the form of restricted stock units. He was granted 141,593 shares of Class A Common Stock at no purchase price, reflecting stock-based compensation rather than an open-market trade.

The RSUs were granted under SES AI Corp's 2021 Incentive Award Plan. They will vest in full on the first anniversary of the May 18, 2026 grant date, as long as Boyd continues his service through that date. After this grant, he holds 437,889 Class A shares directly.

Insider Trade Summary

Grant/Award: 141,593 shares

Grant/Award 1 txn

Insider Boyd Andrew J

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 — 437,889 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 Grant price: $0.0000 per share Holdings after grant: 437,889 shares

3 metrics

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

Grant price $0.0000 per share RSU grant under 2021 Incentive Award Plan

Holdings after grant 437,889 shares Total Class A shares directly held following transaction

Key Terms

restricted stock units ("RSUs"), 2021 Incentive Award Plan, Class A Common Stock, vest in full

4 terms

restricted stock units ("RSUs") financial

"underlying restricted stock units ("RSUs") granted to the reporting person on May 18, 2026"

Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.

2021 Incentive Award Plan financial

"granted to the reporting person on May 18, 2026 ... 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")"

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 of Class A Common Stock will be deliverable"

FAQ

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

What insider transaction did SES director Andrew J. Boyd report?

Andrew J. Boyd reported receiving 141,593 restricted stock units of SES AI Corp Class A Common Stock as a stock grant. The units were awarded at no purchase price as part of his equity compensation under the company’s 2021 Incentive Award Plan.

How many SES (SES) shares did Andrew J. Boyd hold after this grant?

Following the grant, Andrew J. Boyd directly held 437,889 shares of SES AI Corp Class A Common Stock. This total includes the newly granted 141,593 restricted stock units, which are scheduled to vest after one year of continued service from the May 18, 2026 grant date.

What are the vesting terms of Andrew J. Boyd’s SES restricted stock units?

The 141,593 SES AI Corp restricted stock units will vest in full on the first anniversary of the May 18, 2026 grant date. Vesting requires Boyd to remain in service through that vesting date, after which an equal number of Class A shares will be delivered.

Did Andrew J. Boyd buy SES (SES) shares on the open market?

No, Andrew J. Boyd did not buy SES shares on the open market. He received 141,593 shares underlying restricted stock units as a grant at a price of $0.0000 per share, reflecting equity compensation rather than a market purchase or sale.

Under which plan were Andrew J. Boyd’s SES RSUs granted?

The restricted stock units granted to Andrew J. Boyd were issued under SES AI Corp’s 2021 Incentive Award Plan. This plan is used to provide equity-based compensation, and the RSUs will convert into Class A Common Stock after they fully vest following one year of 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^*

Boyd Andrew J

(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	A	$0	437,889(1)	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)