SES AI Corp (SES) Chief Science Officer trades stock under 10b5-1 plan

Rhea-AI Filing Summary

SES AI Corp's Chief Science Officer reported exercising stock options and selling shares of Class A Common Stock. On 12/15/2025, the officer exercised options for 93,277 shares at $0.15 and 6,723 shares at $0.16, then sold 100,000 shares at a weighted average price of $1.9789.

After these transactions, the officer beneficially owns 1,253,286 shares of SES Class A Common Stock, including 852,222 shares underlying restricted stock units that remain subject to forfeiture until they vest. The activity was carried out under a Rule 10b5-1 trading plan entered into on August 14, 2025.

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

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

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 MA 01801

(City) (State) (Zip)

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

3. Date of Earliest Transaction (Month/Day/Year)
12/15/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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	12/15/2025		M(1)		93,277	A	$0.15	1,346,563(2)	D
Class A Common Stock	12/15/2025		M(1)		6,723	A	$0.16	1,353,286(2)	D
Class A Common Stock	12/15/2025		S(1)		100,000	D	$1.9789(3)	1,253,286(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
Stock Option (Right to Buy)	$0.15	12/15/2025		M(1)			93,277	(4)	03/13/2029	Class A Common Stock	93,277	$0	0	D
Stock Option (Right to Buy)	$0.16	12/15/2025		M(1)			6,723	(5)	02/09/2031	Class A Common Stock	6,723	$0	1,179,832	D

Explanation of Responses:

1. The option exercise and sale of Class A Common Stock of the issuer was executed pursuant to a Rule 10b5-1 plan entered into by the Reporting Person on August 14, 2025.

2. Includes 852,222 shares of Class A Common Stock underlying restricted stock units, which are subject to forfeiture until they vest.

3. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.935 to $2.07, inclusive. The Reporting Person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

4. Reflects fully vested options granted on March 14, 2019.

5. Reflects fully vested options granted on February 10, 2021.

	/s/ Kyle Pilkington, Attorney-in-Fact	12/16/2025
	** 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.
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FAQ

What insider stock transactions did SES (SES) report for its Chief Science Officer?

The Chief Science Officer exercised stock options for 93,277 SES AI Corp Class A Common shares at $0.15 and 6,723 shares at $0.16 on 12/15/2025, then sold 100,000 shares at a weighted average price of $1.9789.

How many SES (SES) shares does the Chief Science Officer own after these transactions?

Following the reported transactions, the Chief Science Officer beneficially owns 1,253,286 SES AI Corp Class A Common shares. This total includes 852,222 shares underlying restricted stock units that are subject to forfeiture until they vest.

Were the SES (SES) transactions made under a Rule 10b5-1 trading plan?

Yes. The option exercises and sale of SES AI Corp Class A Common Stock were executed pursuant to a Rule 10b5-1 plan that the reporting person entered into on August 14, 2025.

What SES (SES) stock options were exercised and what are their terms?

The officer exercised a stock option for 93,277 shares at an exercise price of $0.15, which reflects fully vested options granted on March 14, 2019 and expiring on 03/13/2029. A second option for 6,723 shares at $0.16 was also exercised, reflecting fully vested options granted on February 10, 2021 and expiring on 02/09/2031.

What was the price range for the 100,000 SES (SES) shares sold?

The 100,000 SES AI Corp Class A Common shares were sold at a weighted average price of $1.9789. The individual sale prices ranged from $1.935 to $2.07, inclusive.

How many SES (SES) stock options does the Chief Science Officer still hold after these transactions?

After the reported exercises, the officer holds 1,179,832 SES AI Corp stock options with an exercise price of $0.16 per share, expiring on 02/09/2031, while the exercised $0.15 options show 0 remaining.