SES AI Corp (SES) CSO has shares withheld for RSU tax obligations

Rhea-AI Filing Summary

SES AI Corp's Chief Science Officer Hong Gan reported a routine tax-related share disposition. On the vesting of restricted stock units, 32,138 shares of Class A Common Stock were withheld at $1.10 per share to cover withholding tax obligations; these shares were not sold in the market.

After this withholding, Gan directly holds 1,031,576 shares of Class A Common Stock, including 474,580 shares underlying restricted stock units that remain subject to forfeiture until they vest.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Gan Hong

Role CHIEF SCIENCE OFFICER

Type	Security	Shares	Price	Value
Tax Withholding	Class A Common Stock	32,138	$1.10	$35K

Holdings After Transaction: Class A Common Stock — 1,031,576 shares (Direct)

Footnotes (1)

1. Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person. Includes 474,580 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

Key Figures

Tax-withheld shares: 32,138 shares Withholding price: $1.10 per share Post-transaction holdings: 1,031,576 shares +1 more

4 metrics

Tax-withheld shares 32,138 shares Shares withheld to cover RSU tax obligations

Withholding price $1.10 per share Value used for RSU tax-withholding shares

Post-transaction holdings 1,031,576 shares Direct Class A Common Stock held after transaction

Unvested RSU underlying shares 474,580 shares Class A shares underlying RSUs subject to forfeiture

Key Terms

restricted stock units, withholding tax obligations, Class A Common Stock

3 terms

restricted stock units financial

"Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units"

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.

withholding tax obligations financial

"Represents shares withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units"

Class A Common Stock financial

"Includes 474,580 shares of 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.

Form 4 Insider Transactions: What Each Field Means →

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^*

Gan Hong

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/14/2026

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	04/14/2026		F(1)		32,138(1)	D	$1.1	1,031,576(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 withheld to cover the Reporting Person's withholding tax obligations in connection with the vesting of restricted stock units ("RSUs"). These shares were not sold by the Reporting Person.

2. Includes 474,580 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

	/s/ Kyle Pilkington, Attorney-in-Fact	04/16/2026
	** 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)

FAQ

What insider transaction did SES (SES) report for Hong Gan?

SES AI Corp reported that Chief Science Officer Hong Gan had 32,138 shares of Class A Common Stock withheld to cover tax obligations on vesting RSUs. This was a tax-withholding disposition, and the shares were not sold in the open market.

Were SES (SES) shares sold by Hong Gan in this Form 4 filing?

No shares were sold by Hong Gan. The 32,138 SES AI Corp shares reported were withheld by the company to satisfy withholding tax obligations tied to restricted stock unit vesting, rather than being sold in market transactions.

How many SES (SES) shares does Hong Gan hold after the reported transaction?

After the tax-withholding disposition, Chief Science Officer Hong Gan directly holds 1,031,576 shares of SES AI Corp Class A Common Stock. This total includes shares underlying restricted stock units that remain subject to forfeiture until they fully vest.

What role did restricted stock units play in this SES (SES) Form 4?

The Form 4 centers on restricted stock units vesting for Hong Gan. When the RSUs vested, 32,138 SES AI Corp shares were withheld to cover tax obligations. Additionally, 474,580 shares underlying RSUs remain unvested and subject to forfeiture.

How many SES (SES) restricted stock unit shares remain unvested for Hong Gan?

The filing notes that 474,580 shares of SES AI Corp Class A Common Stock underlie restricted stock units held by Hong Gan. These RSU-linked shares are subject to forfeiture until they vest according to their original award terms.