SEALSQ (LAES) CFO exercises options, lifts stake to 265,595 shares

Rhea-AI Filing Summary

SEALSQ Corp Chief Financial Officer John Charles O'Hara received and exercised stock options linked to the company’s ordinary shares. He was granted 100,000 employee stock options with a $0.01 exercise price per share and then exercised all of them to acquire 100,000 ordinary shares.

Following these transactions, his direct ownership in SEALSQ increased to 265,595 ordinary shares. A footnote states that the option exercise was carried out under a pre-arranged Rule 10b5-1 trading plan adopted by O'Hara on October 17, 2025, indicating the timing was set in advance.

Insider Trade Summary 10b5-1

100,000 shares exercised/converted

Mixed 3 txns

Insider O'Hara John Charles

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Grant/Award	Employee Stock Option (right to buy)	100,000	$0.00	--
Exercise	Employee Stock Option (right to buy)	100,000	$0.00	--
Exercise	Ordinary Shares	100,000	$0.01	$1K

Holdings After Transaction: Employee Stock Option (right to buy) — 100,000 shares (Direct); Ordinary Shares — 265,595 shares (Direct)

Footnotes (1)

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Key Figures

Options granted: 100,000 options Exercise price: $0.01 per share Shares acquired via exercise: 100,000 ordinary shares +1 more

4 metrics

Options granted 100,000 options Employee Stock Option grant on March 30, 2026

Exercise price $0.01 per share Conversion/exercise price for 100,000 options

Shares acquired via exercise 100,000 ordinary shares Options exercised on March 30, 2026

Shares owned after transaction 265,595 ordinary shares Direct ownership following Form 4 transactions

Key Terms

Employee Stock Option (right to buy), derivative security, Rule 10b5-1 trading plan

3 terms

Employee Stock Option (right to buy) financial

"security_title": "Employee Stock Option (right to buy)""

derivative security financial

"transaction_code_description": "Exercise or conversion of derivative security""

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

Rule 10b5-1 trading plan financial

"was effected pursuant to a Rule 10b5-1 trading plan adopted"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

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).

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^*

O'Hara John Charles

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/30/2026

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	03/30/2026		M		100,000	A	$0.01	265,595	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	03/30/2026		A		100,000		03/30/2026	04/30/2032	Ordinary Shares	100,000	$0	100,000	D
Employee Stock Option (right to buy)	$0.01	03/30/2026(1)		M		100,000		03/30/2026	04/30/2032	Ordinary Shares	100,000	$0	0	D

Explanation of Responses:

1. The options exercise reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 17, 2025.

	/s/ John O'Hara	03/31/2026
	** 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 (LAES) report for its CFO?

SEALSQ reported that CFO John Charles O'Hara received 100,000 employee stock options and exercised them to acquire 100,000 ordinary shares at a $0.01 exercise price, increasing his direct share ownership.

How many SEALSQ (LAES) shares does the CFO hold after this Form 4?

After the reported transactions, CFO John Charles O'Hara directly owns 265,595 SEALSQ ordinary shares, reflecting the 100,000 shares acquired through exercising employee stock options at a $0.01 exercise price.

What was the exercise price of the SEALSQ (LAES) stock options?

The employee stock options granted to SEALSQ CFO John Charles O'Hara had an exercise price of $0.01 per underlying ordinary share, and he exercised 100,000 of these options to receive 100,000 ordinary shares.

Were the SEALSQ (LAES) CFO’s transactions under a Rule 10b5-1 plan?

Yes. A footnote explains that the options exercise reported for SEALSQ CFO John Charles O'Hara was effected pursuant to a Rule 10b5-1 trading plan that he adopted on October 17, 2025, indicating pre-planned trading activity.

Did SEALSQ (LAES) CFO dispose of any shares in this Form 4?

No share dispositions were reported. The Form 4 shows only acquisitions: the grant of employee stock options and their exercise into 100,000 ordinary shares, resulting in 265,595 shares directly owned afterward.