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[Form 4] SES AI Corporation Insider Trading Activity

Filing Impact
(Low)
Filing Sentiment
(Neutral)
Form Type
4
Rhea-AI Filing Summary

Kyle Pilkington, Chief Legal Officer of SES AI Corporation (SES), reported a change in beneficial ownership tied to the vesting of restricted stock units (RSUs). On 08/08/2025 the Form 4 shows 5,452 shares were withheld to satisfy withholding tax obligations arising from RSU vesting; the form explicitly states these shares were not sold.

After this withholding, the report lists 861,277 shares of Class A common stock beneficially owned by Pilkington, which include 681,778 shares underlying RSUs that remain subject to forfeiture until they vest. Ownership is reported as direct. The form records a price of $1.13 associated with the reported transaction and uses transaction code F indicating tax withholding.

Kyle Pilkington, Chief Legal Officer di SES AI Corporation (SES), ha segnalato una variazione nella proprietà beneficiaria legata alla maturazione delle restricted stock unit (RSU). In data 08/08/2025 il Form 4 indica che sono state trattenute 5,452 azioni per soddisfare gli obblighi di ritenuta fiscale derivanti dalla maturazione delle RSU; il modulo specifica esplicitamente che queste azioni non sono state vendute.

Dopo questa ritenuta, il rapporto riporta che Pilkington possiede beneficiariamente 861,277 azioni di classe A, che includono 681,778 azioni sottostanti alle RSU che restano soggette a perdita (forfeiture) fino alla loro maturazione. La proprietà è dichiarata come diretta. Il modulo riporta un prezzo di $1.13 associato alla transazione segnalata e utilizza il codice transazione F, che indica ritenuta fiscale.

Kyle Pilkington, Chief Legal Officer de SES AI Corporation (SES), informó un cambio en la propiedad beneficiaria vinculado a la consolidación (vesting) de unidades restringidas de acciones (RSU). El 08/08/2025 el Formulario 4 muestra que se retuvieron 5,452 acciones para cubrir obligaciones fiscales por retención derivadas del vesting de las RSU; el formulario especifica explícitamente que dichas acciones no fueron vendidas.

Tras esta retención, el informe indica que Pilkington posee beneficiariamente 861,277 acciones de la clase A, que incluyen 681,778 acciones subyacentes a RSU que permanecen sujetas a pérdida (forfeiture) hasta que se consoliden. La titularidad se reporta como directa. El formulario registra un precio de $1.13 asociado a la transacción informada y utiliza el código de transacción F, que indica retención fiscal.

SES AI Corporation(SES)의 최고법무책임자(Chief Legal Officer)인 Kyle Pilkington은 제한주식단위(RSU)의 권리 확정(vesting)에 따른 수익적 소유권 변경을 보고했습니다. 2025년 08월 08일 제출된 Form 4에는 RSU 베스팅으로 발생한 원천징수 세금 의무를 충족하기 위해 5,452주가 원천징수용으로 보류되었다고 기재되어 있으며, 해당 주식은 매도되지 않았다고 명시되어 있습니다.

이 원천징수 이후 보고서는 Pilkington이 861,277주의 클래스 A 보통주를 수익적으로 보유하고 있음을 기재하고 있으며, 여기에는 베스팅될 때까지 몰수 대상(포퍼처)로 남아 있는 681,778주의 RSU 기초 주식이 포함됩니다. 소유권은 직접 소유로 보고되었습니다. 양식에는 보고된 거래와 관련된 $1.13의 가격이 기록되어 있으며, 세금 원천징수를 나타내는 거래 코드 F가 사용되었습니다.

Kyle Pilkington, Chief Legal Officer de SES AI Corporation (SES), a déclaré une modification de la propriété bénéficiaire liée à la levée des restrictions des restricted stock units (RSU). Le 08/08/2025, le Formulaire 4 indique que 5,452 actions ont été retenues pour satisfaire des obligations fiscales de retenue à la source résultant du vesting des RSU ; le formulaire précise explicitement que ces actions n'ont pas été vendues.

Après cette retenue, le rapport indique que Pilkington détient bénéficiairement 861,277 actions de classe A, qui incluent 681,778 actions sous-jacentes aux RSU et restées soumises à confiscation (forfeiture) jusqu'à leur vesting. La propriété est déclarée comme directe. Le formulaire mentionne un prix de $1.13 lié à la transaction signalée et utilise le code de transaction F, indiquant une retenue fiscale.

Kyle Pilkington, Chief Legal Officer der SES AI Corporation (SES), meldete eine Änderung des wirtschaftlichen Eigentums im Zusammenhang mit dem Vesting von Restricted Stock Units (RSUs). Am 08.08.2025 weist das Formblatt 4 aus, dass 5,452 Aktien einbehalten wurden, um die aus dem RSU-Vesting resultierenden Steuerabzugsverpflichtungen zu erfüllen; das Formular stellt ausdrücklich fest, dass diese Aktien nicht verkauft wurden.

Nach diesem Einbehalt gibt der Bericht an, dass Pilkington wirtschaftlich 861,277 Aktien der Klasse A besitzt, darunter 681,778 Aktien, die den RSUs zugrunde liegen und bis zum Vesting weiterhin dem Verlust (Forfeiture) unterliegen. Die Eigentümerschaft wird als direkt angegeben. Das Formular verzeichnet einen Preis von $1.13 für die gemeldete Transaktion und verwendet den Transaktionscode F, der auf Steuerabzug hinweist.

Positive
  • Significant retained stake: Reporting person beneficially owns 861,277 shares, indicating continued alignment with shareholder interests.
  • Shares withheld, not sold: The 5,452 shares were withheld to cover taxes on RSU vesting and the form explicitly states these shares were not sold.
Negative
  • Large unvested portion: 681,778 shares underlying RSUs are still subject to forfeiture and are not currently fully vested.
  • Limited immediate economic rights: Because a majority of the reported stake is unvested, the effective, fully vested ownership is materially lower than the total beneficial ownership figure.

Insights

Routine RSU tax-withholding; maintains direct ownership but many shares remain unvested.

The Form 4 indicates a standard post-vesting administrative step rather than an active sale: 5,452 shares were withheld to cover taxes rather than being sold on-market, preserving the reporting person’s stake. Beneficial ownership of 861,277 shares is substantial in absolute terms, but the disclosure that 681,778 shares are unvested RSUs materially limits the immediate economic rights attached to a large portion of that holding. Transaction code F appropriately describes tax withholding; no derivative transactions are reported.

Insider retained long-term exposure via RSUs; withholding is administrative, not a disposition signal.

The filing reflects executive compensation mechanics: shares withheld to satisfy withholding tax on RSU vesting are routine and explicitly "not sold," which preserves alignment with shareholders. However, 681,778 underlying RSUs remain subject to forfeiture, indicating that a majority of the reported stake lacks full vesting rights today. For governance assessment, this highlights continued incentive alignment but also limited immediate liquidity or voting availability for much of the position.

Kyle Pilkington, Chief Legal Officer di SES AI Corporation (SES), ha segnalato una variazione nella proprietà beneficiaria legata alla maturazione delle restricted stock unit (RSU). In data 08/08/2025 il Form 4 indica che sono state trattenute 5,452 azioni per soddisfare gli obblighi di ritenuta fiscale derivanti dalla maturazione delle RSU; il modulo specifica esplicitamente che queste azioni non sono state vendute.

Dopo questa ritenuta, il rapporto riporta che Pilkington possiede beneficiariamente 861,277 azioni di classe A, che includono 681,778 azioni sottostanti alle RSU che restano soggette a perdita (forfeiture) fino alla loro maturazione. La proprietà è dichiarata come diretta. Il modulo riporta un prezzo di $1.13 associato alla transazione segnalata e utilizza il codice transazione F, che indica ritenuta fiscale.

Kyle Pilkington, Chief Legal Officer de SES AI Corporation (SES), informó un cambio en la propiedad beneficiaria vinculado a la consolidación (vesting) de unidades restringidas de acciones (RSU). El 08/08/2025 el Formulario 4 muestra que se retuvieron 5,452 acciones para cubrir obligaciones fiscales por retención derivadas del vesting de las RSU; el formulario especifica explícitamente que dichas acciones no fueron vendidas.

Tras esta retención, el informe indica que Pilkington posee beneficiariamente 861,277 acciones de la clase A, que incluyen 681,778 acciones subyacentes a RSU que permanecen sujetas a pérdida (forfeiture) hasta que se consoliden. La titularidad se reporta como directa. El formulario registra un precio de $1.13 asociado a la transacción informada y utiliza el código de transacción F, que indica retención fiscal.

SES AI Corporation(SES)의 최고법무책임자(Chief Legal Officer)인 Kyle Pilkington은 제한주식단위(RSU)의 권리 확정(vesting)에 따른 수익적 소유권 변경을 보고했습니다. 2025년 08월 08일 제출된 Form 4에는 RSU 베스팅으로 발생한 원천징수 세금 의무를 충족하기 위해 5,452주가 원천징수용으로 보류되었다고 기재되어 있으며, 해당 주식은 매도되지 않았다고 명시되어 있습니다.

이 원천징수 이후 보고서는 Pilkington이 861,277주의 클래스 A 보통주를 수익적으로 보유하고 있음을 기재하고 있으며, 여기에는 베스팅될 때까지 몰수 대상(포퍼처)로 남아 있는 681,778주의 RSU 기초 주식이 포함됩니다. 소유권은 직접 소유로 보고되었습니다. 양식에는 보고된 거래와 관련된 $1.13의 가격이 기록되어 있으며, 세금 원천징수를 나타내는 거래 코드 F가 사용되었습니다.

Kyle Pilkington, Chief Legal Officer de SES AI Corporation (SES), a déclaré une modification de la propriété bénéficiaire liée à la levée des restrictions des restricted stock units (RSU). Le 08/08/2025, le Formulaire 4 indique que 5,452 actions ont été retenues pour satisfaire des obligations fiscales de retenue à la source résultant du vesting des RSU ; le formulaire précise explicitement que ces actions n'ont pas été vendues.

Après cette retenue, le rapport indique que Pilkington détient bénéficiairement 861,277 actions de classe A, qui incluent 681,778 actions sous-jacentes aux RSU et restées soumises à confiscation (forfeiture) jusqu'à leur vesting. La propriété est déclarée comme directe. Le formulaire mentionne un prix de $1.13 lié à la transaction signalée et utilise le code de transaction F, indiquant une retenue fiscale.

Kyle Pilkington, Chief Legal Officer der SES AI Corporation (SES), meldete eine Änderung des wirtschaftlichen Eigentums im Zusammenhang mit dem Vesting von Restricted Stock Units (RSUs). Am 08.08.2025 weist das Formblatt 4 aus, dass 5,452 Aktien einbehalten wurden, um die aus dem RSU-Vesting resultierenden Steuerabzugsverpflichtungen zu erfüllen; das Formular stellt ausdrücklich fest, dass diese Aktien nicht verkauft wurden.

Nach diesem Einbehalt gibt der Bericht an, dass Pilkington wirtschaftlich 861,277 Aktien der Klasse A besitzt, darunter 681,778 Aktien, die den RSUs zugrunde liegen und bis zum Vesting weiterhin dem Verlust (Forfeiture) unterliegen. Die Eigentümerschaft wird als direkt angegeben. Das Formular verzeichnet einen Preis von $1.13 für die gemeldete Transaktion und verwendet den Transaktionscode F, der auf Steuerabzug hinweist.

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*
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)
08/08/2025
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 08/08/2025 F(1) 5,452 D $1.13 861,277(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 681,778 shares of Class A Common Stock underlying RSUs, which are subject to forfeiture until they vest.
/s/ Kyle Pilkington 08/11/2025
** 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.
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.

FAQ

What did the SES (SES) Form 4 filed by Kyle Pilkington report?

The Form 4 reports that 5,452 shares were withheld to cover withholding taxes on RSU vesting and that the reporting person beneficially owns 861,277 Class A shares.

Why were 5,452 shares withheld in the SES insider report?

The filing explains those shares were withheld to satisfy the reporting person’s withholding tax obligations in connection with RSU vesting and were not sold.

How many of Kyle Pilkington’s SES shares are unvested RSUs?

The report states 681,778 shares underlying RSUs are subject to forfeiture until they vest.

What transaction code and price are shown on the Form 4?

The transaction is recorded with transaction code F and shows a price of $1.13 associated with the reported transaction.

What is Kyle Pilkington’s role at SES as stated in the Form 4?

The Form 4 identifies the reporting person as Chief Legal Officer of SES AI Corporation.
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