SES AI (NYSE: SES) CLO sells 25,000 shares under 10b5-1 plan

Rhea-AI Filing Summary

SES AI Corp’s chief legal officer, Kyle Pilkington, reported an open-market sale of 25,000 shares of Class A Common Stock at $1.20 per share. After this transaction, he directly holds 780,203 shares, which the disclosure notes include 568,785 shares underlying RSUs that may be forfeited if they do not vest. The company states the sale was executed under a Rule 10b5-1 trading plan that Pilkington entered into on November 12, 2025, indicating the disposition was pre-planned rather than a discretionary market-timing decision.

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

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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^*

Pilkington Kyle

(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 LEGAL OFFICER

3. Date of Earliest Transaction (Month/Day/Year)
03/09/2026

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	03/09/2026		S(1)		25,000	D	$1.2	780,203(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. The 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 November 12, 2025.

2. Includes 568,785 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.

	/s/ Kyle Pilkington	03/11/2026
	** 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).
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FAQ

What insider transaction did SES (SES) disclose in this Form 4?

SES AI Corp disclosed an insider sale of 25,000 Class A shares. Chief legal officer Kyle Pilkington executed an open-market transaction at $1.20 per share, reducing but not eliminating his position and leaving substantial direct holdings reported after the sale.

Who at SES (SES) sold shares and what is their role?

Kyle Pilkington, SES AI Corp’s chief legal officer, sold shares. He is identified as an officer, not a director or 10% owner, and reported a single open-market sale of 25,000 Class A Common Stock shares in this Form 4 filing.

How many SES (SES) shares did the insider sell and at what price?

The insider sold 25,000 SES AI Class A shares at $1.20 each. The Form 4 characterizes this as an open-market sale, giving a total transaction value based on the disclosed per-share price and reported share count sold.

How many SES (SES) shares does the insider hold after this transaction?

After the sale, the insider directly holds 780,203 SES shares. This figure reflects total Class A Common Stock holdings, including a large component of restricted stock units that may be forfeited if vesting conditions are not ultimately satisfied.

Were SES (SES) shares sold under a Rule 10b5-1 trading plan?

Yes, the sale was executed pursuant to a Rule 10b5-1 plan. A footnote states the plan was entered into on November 12, 2025, indicating the timing of the 25,000-share disposition was pre-arranged rather than an ad hoc market decision.

What portion of the SES (SES) insider’s holdings are restricted stock units (RSUs)?

The filing notes 568,785 SES shares are underlying RSUs. These restricted stock units are included within the reported 780,203 post-transaction shares and remain subject to potential forfeiture until they fully vest under the applicable terms.