SEALSQ Corp (LAES) director files Form 3 on option holdings

Rhea-AI Filing Summary

SEALSQ Corp director Ruma Bose has filed an initial ownership report detailing existing stock option holdings. The Form 3 lists three direct positions in Employee Stock Option Plan awards, each giving rights to acquire SEALSQ ordinary shares at an exercise price of $0.01 per share.

The reported option positions cover underlying ordinary shares in amounts of 21,824, 16,062 and 34,291, with expiration dates in 2031 and 2032. These entries reflect current derivative holdings rather than new market purchases or sales, making this a routine disclosure of beneficial ownership.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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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1. Name and Address of Reporting Person^*

Bose Ruma

(Last) (First) (Middle)

C/O SEALSQ CORP

AVENUE LOUIS-CASAI 58

(Street)

COINTRIN 1216

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/18/2026

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

3a. Foreign Trading Symbol

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

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

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Employee Stock Option Plan (right to buy)	07/15/2024	05/29/2031	Ordinary Shares	21,824	$0.01	D
Employee Stock Option Plan (right to buy)	07/15/2024	07/03/2031	Ordinary Shares	16,062	$0.01	D
Employee Stock Option Plan (right to buy)	05/08/2025	04/30/2032	Ordinary Shares	34,291	$0.01	D

Explanation of Responses:

	/s/ John O'Hara, Attorney-in-Fact	03/19/2026
	** 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 5 (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 3: SEC 1473 (03-26)

FAQ

What does SEALSQ Corp (LAES) disclose about Ruma Bose in this Form 3?

SEALSQ Corp reports that director Ruma Bose holds several employee stock options. The filing lists three direct option positions under the Employee Stock Option Plan, each tied to SEALSQ ordinary shares, establishing her initial reported beneficial ownership in derivative securities.

What type of securities does Ruma Bose report holding in SEALSQ Corp (LAES)?

Ruma Bose reports holdings in Employee Stock Option Plan rights to buy ordinary shares. These are derivative securities giving her the right, but not the obligation, to purchase SEALSQ ordinary shares at a fixed exercise price of $0.01 per share.

Are there any buy or sell transactions for SEALSQ Corp (LAES) in this Form 3?

No buy or sell transactions are reported in this Form 3. The entries are labeled as holdings, and the transaction summary shows zero buys, zero sells, and three unknown-code records reflecting existing option positions rather than new trades.

What are the expiration dates of the SEALSQ Corp (LAES) options held by Ruma Bose?

The reported employee stock options expire between 2031 and 2032. The underlying positions include grants with expiration dates of May 29, 2031, July 3, 2031, and April 30, 2032, defining how long the options remain exercisable.

How many SEALSQ Corp (LAES) ordinary shares underlie Ruma Bose’s option holdings?

The filing lists three blocks of underlying ordinary shares. These blocks cover 21,824, 16,062 and 34,291 ordinary shares through employee stock options, all held directly, illustrating the scale of her derivative exposure to SEALSQ equity.