SEALSQ (LAES) VP exercises options, now directly holds 20,000 shares

Rhea-AI Filing Summary

SEALSQ Corp Vice-President, Global Sales Franck Jean Buonanno exercised employee stock options to acquire 15,000 ordinary shares. The options had an exercise price of $0.01 per share. Following this derivative exercise, he directly holds a total of 20,000 ordinary shares. No open-market sale or gift was reported in this filing, indicating an exercise-and-hold transaction rather than a sale.

Insider Trade Summary

15,000 shares exercised/converted

Mixed 2 txns

Insider Buonanno Franck Jean

Role Vice-President, Global Sales

Type	Security	Shares	Price	Value
Exercise	Employee Stock Option (right to buy)	15,000	$0.00	--
Exercise	Ordinary Shares	15,000	$0.01	$150.00

Holdings After Transaction: Employee Stock Option (right to buy) — 20,000 shares (Direct); Ordinary Shares — 20,000 shares (Direct)

Footnotes (1)

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^*

Buonanno Franck Jean

(Last) (First) (Middle)

C/O SEALSQ CORP

AVENUE LOUIS-CASAI 58

(Street)

COINTRIN 1216

(City) (State) (Zip)

SWITZERLAND

(Country)

2. Issuer Name and Ticker or Trading Symbol
SEALSQ Corp [ LAES ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Vice-President, Global Sales

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
Ordinary Shares	03/27/2026		M		15,000	A	$0.01	20,000	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
Employee Stock Option (right to buy)	$0.01	03/27/2026		M			15,000	02/20/2026	04/30/2032	Ordinary Shares	15,000	$0	20,000	D

Explanation of Responses:

	/s/ John O'Hara, Attorney-in-Fact	03/27/2026
	** 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)

FAQ

What insider transaction did SEALSQ Corp (LAES) report for Franck Jean Buonanno?

SEALSQ Corp reported that Vice-President, Global Sales Franck Jean Buonanno exercised employee stock options. He converted options into 15,000 ordinary shares through a derivative exercise classified under code M, without any related open-market sale in this filing.

How many SEALSQ (LAES) shares did the executive acquire and at what exercise price?

Buonanno acquired 15,000 ordinary shares of SEALSQ Corp through an option exercise. The employee stock options carried an exercise price of $0.01 per share, reflecting a typical compensation-related equity grant being converted into directly held common shares.

What are Franck Jean Buonanno’s SEALSQ (LAES) holdings after this Form 4 transaction?

After the reported transactions, Buonanno directly holds 20,000 SEALSQ ordinary shares. The Form 4 shows total_shares_following_transaction of 20,000 for both the option exercise and resulting common shares, indicating his post-transaction direct ownership level.

Did the SEALSQ (LAES) executive sell any shares in this Form 4 filing?

No share sales were reported in this Form 4. The transactions both carry code M for exercise or conversion of a derivative security and are marked as acquisitions, with no open-market sale, tax withholding disposition, or gift shown in the transaction summary.

What type of security did SEALSQ (LAES) options convert into for the executive?

The employee stock options converted into SEALSQ ordinary shares. The filing lists an Employee Stock Option as the derivative security and 15,000 underlying ordinary shares, which became directly held shares upon exercise on the reported transaction date.

Were any SEALSQ (LAES) derivative positions left after Buonanno’s option exercise?

The filing shows no remaining derivative positions after this exercise. The derivativeSummary section is empty, and the transactionSummary records one exercise of 15,000 options, suggesting this Form 4 does not list additional unexercised options for this grant.