SES AI (SES) chief science officer uses 74,682 shares for RSU tax withholding

Rhea-AI Filing Summary

SES AI Corp chief science officer Gan Hong had 74,682 shares of Class A Common Stock withheld on March 27, 2026 to cover withholding tax obligations from vesting restricted stock units. According to the filing, these shares were not sold on the market. After this tax-withholding disposition, Hong directly owned 1,063,714 shares, including 544,316 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	74,682	$0.9873	$74K

Holdings After Transaction: Class A Common Stock — 1,063,714 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 544,316 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

Key Figures

Shares withheld for taxes: 74,682 shares Price per share used: $0.9873 per share Shares owned after transaction: 1,063,714 shares +1 more

4 metrics

Shares withheld for taxes 74,682 shares Tax-withholding disposition on March 27, 2026

Price per share used $0.9873 per share Value applied to withheld shares

Shares owned after transaction 1,063,714 shares Direct Class A Common Stock holdings following transaction

Shares underlying RSUs 544,316 shares Class A shares underlying restricted stock units subject to forfeiture until vesting

Key Terms

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

4 terms

restricted stock units financial

"vesting of restricted stock units ("RSUs"). These shares were not sold"

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

"shares withheld to cover the Reporting Person's withholding tax obligations in connection"

Class A Common Stock financial

"Includes 544,316 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.

tax-withholding disposition financial

"transaction_action": "tax-withholding disposition""

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

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)
03/27/2026

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	03/27/2026		F(1)		74,682	D	$0.9873	1,063,714(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 544,316 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

	/s/ Kyle Pilkington, Attorney-in-Fact	03/31/2026
	** 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 did SES (SES) insider Gan Hong report in this Form 4?

Gan Hong reported a tax-related disposition of 74,682 SES AI Corp Class A shares. The shares were withheld by the company to satisfy withholding tax obligations from vesting restricted stock units, and were not sold in the open market.

Were SES (SES) shares sold on the market in Gan Hong’s recent filing?

No, the Form 4 states the 74,682 SES AI shares were withheld to cover Gan Hong’s tax obligations on vesting RSUs. The footnote clarifies these shares were not sold by the reporting person in any open-market transaction.

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

After the tax-withholding disposition, Gan Hong directly holds 1,063,714 SES AI Class A shares. This total includes 544,316 shares underlying restricted stock units that remain subject to forfeiture until they vest in the future.

What are the restricted stock units mentioned in SES (SES) insider filing?

The filing notes 544,316 SES AI shares underlying restricted stock units held by Gan Hong. These RSUs represent future share delivery that is still subject to forfeiture and will only fully belong to the holder as they continue to vest over time.

What does transaction code F mean in the SES (SES) Form 4?

Transaction code F indicates a tax-withholding disposition, where shares are delivered to cover tax or exercise costs. In this SES AI filing, 74,682 shares were withheld to satisfy Gan Hong’s withholding tax obligations tied to RSU vesting, not a discretionary sale.