SES AI Corp (SES) legal chief sells 25,000 shares in planned 10b5-1 trade

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 a weighted average price of $1.2003 per share. The transaction was executed on May 22, 2026 pursuant to a pre-arranged Rule 10b5-1 trading plan entered into on November 12, 2025.

Following this sale, Pilkington directly holds 1,023,548 shares of Class A Common Stock. This figure includes 733,646 shares underlying restricted stock units (RSUs) that remain subject to forfeiture until they vest.

Insider Trade Summary 10b5-1

Net Seller: 25,000 shares ($30,007)

Net Sell 1 txn

Insider Pilkington Kyle

Role CHIEF LEGAL OFFICER

Sold 25,000 shs ($30K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock	25,000	$1.2003	$30K

Holdings After Transaction: Class A Common Stock — 1,023,548 shares (Direct)

Footnotes (1)

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. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.20 to $1.21, 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. Includes 733,646 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.

Key Figures

Shares sold: 25,000 shares Average sale price: $1.2003 per share Shares held after transaction: 1,023,548 shares +2 more

5 metrics

Shares sold 25,000 shares Open-market sale on May 22, 2026

Average sale price $1.2003 per share Weighted average, trades between $1.20 and $1.21

Shares held after transaction 1,023,548 shares Direct Class A Common Stock holdings post-sale

RSU underlying shares 733,646 shares Class A shares underlying RSUs subject to forfeiture until vesting

Rule 10b5-1 plan date November 12, 2025 Date trading plan was entered into by reporting person

Key Terms

Rule 10b5-1 plan, weighted average price, restricted stock units (RSUs), Class A Common Stock

4 terms

Rule 10b5-1 plan regulatory

"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"

A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.

weighted average price financial

"The price reported is a weighted average price. These shares were sold in multiple transactions"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

restricted stock units (RSUs) financial

"Includes 733,646 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest"

Restricted stock units (RSUs) are a type of company promise to give employees shares of stock in the future, usually after certain conditions like working for a set time. They are like a gift promised today that you receive later, which can become valuable if the company's stock price goes up. RSUs matter because they are a way companies reward employees and can be a significant part of compensation.

Class A Common Stock financial

"The sale of Class A Common Stock of the issuer was executed pursuant to a Rule 10b5-1 plan"

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.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 05/27/2026 - 05:30 PM Accepted by SEC EDGAR 05/27/2026 - 05:30 PM Learn about SEC filing dates

FAQ

What insider transaction did SES (SES) disclose for Kyle Pilkington?

SES AI Corp disclosed that Chief Legal Officer Kyle Pilkington sold 25,000 shares of Class A Common Stock in an open-market transaction. The sale occurred at a weighted average price of $1.2003 per share on May 22, 2026, as reported in a Form 4 filing.

At what price did the SES (SES) insider shares sell in this Form 4?

The reported SES AI Corp insider sale used a weighted average price of $1.2003 per share. The 25,000 shares were sold in multiple trades within a range from $1.20 to $1.21, according to the Form 4 footnote describing pricing details.

How many SES (SES) shares does Kyle Pilkington hold after the reported sale?

After the reported sale, Kyle Pilkington directly holds 1,023,548 SES AI Corp Class A Common shares. This total includes 733,646 shares underlying restricted stock units (RSUs), which are subject to forfeiture until they vest under the terms of his equity awards.

Was the SES (SES) insider stock sale made under a Rule 10b5-1 plan?

Yes. The SES AI Corp Form 4 states the sale was executed pursuant to a Rule 10b5-1 trading plan. The plan was entered into by Kyle Pilkington on November 12, 2025, indicating the transaction was pre-arranged rather than timed discretionarily.

What role does Kyle Pilkington hold at SES (SES) in this Form 4 filing?

In this Form 4, Kyle Pilkington is identified as the Chief Legal Officer of SES AI Corp. His position is disclosed in the reporting person details, confirming he is an officer but not a director or 10% owner in this specific filing.

What are the RSUs mentioned in the SES (SES) insider holding disclosure?

The Form 4 notes that Pilkington’s holdings include 733,646 shares of Class A Common Stock underlying RSUs. These restricted stock units are subject to forfeiture until they vest, meaning he must satisfy vesting conditions before fully owning those underlying shares.

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).

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 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 LEGAL OFFICER

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/22/2026

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	05/22/2026		S(1)		25,000	D	$1.2003(2)	1,023,548(3)	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. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.20 to $1.21, 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.

3. Includes 733,646 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.

	/s/ Kyle Pilkington	05/27/2026
	** 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)