SEALSQ (LAES) VP sells 10,000 shares in Rule 10b5-1 stock plan

Rhea-AI Filing Summary

SEALSQ Corp Vice-President of Global Sales Franck Jean Buonanno sold 10,000 Ordinary Shares of LAES in an open-market transaction. The shares were sold at $2.35 per share, and he now directly holds 10,000 Ordinary Shares following the sale. According to the footnote, these sales were effected under a pre-arranged Rule 10b5-1 trading plan adopted on October 13, 2025, indicating they were scheduled in advance rather than timed discretionarily.

Insider Trade Summary 10b5-1

Net Seller: 10,000 shares ($23,500)

Net Sell 1 txn

Insider Buonanno Franck Jean

Role Vice-President, Global Sales

Sold 10,000 shs ($24K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares	10,000	$2.35	$24K

Holdings After Transaction: Ordinary Shares — 10,000 shares (Direct)

Footnotes (1)

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Key Figures

Shares sold: 10,000 shares Sale price: $2.35 per share Shares held after sale: 10,000 shares

3 metrics

Shares sold 10,000 shares Ordinary Shares sold on March 31, 2026

Sale price $2.35 per share Open-market sale of Ordinary Shares

Shares held after sale 10,000 shares Total Ordinary Shares directly owned following transaction

Key Terms

Rule 10b5-1 trading plan, open-market sale, Ordinary Shares, Form 4

4 terms

Rule 10b5-1 trading plan regulatory

"sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan"

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.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Ordinary Shares financial

""security_title": "Ordinary Shares""

Ordinary shares are a type of ownership stake in a company, giving shareholders a right to participate in the company’s profits and decision-making through voting. They are similar to owning a piece of a business, and their value can rise or fall based on the company's performance. Investors buy ordinary shares to potentially earn dividends and benefit from the company's growth over time.

Form 4 regulatory

"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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^*

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)
03/31/2026

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	03/31/2026		S(1)		10,000	D	$2.35	10,000	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

Explanation of Responses:

1. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 13, 2025.

	/s/ John O'Hara, Attorney-in-Fact	04/01/2026
	** 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 did SEALSQ (LAES) executive Franck Jean Buonanno report in this Form 4?

Franck Jean Buonanno reported selling 10,000 Ordinary Shares of SEALSQ Corp in an open-market transaction at $2.35 per share. After the sale, he directly holds 10,000 Ordinary Shares, according to the Form 4 disclosure.

At what price were the SEALSQ (LAES) shares sold by the vice president?

The 10,000 SEALSQ Corp Ordinary Shares were sold at $2.35 per share. This transaction was reported as an open-market sale and was executed under a pre-arranged Rule 10b5-1 trading plan adopted by the reporting person on October 13, 2025.

How many SEALSQ (LAES) shares does Franck Jean Buonanno hold after the transaction?

Following the reported sale, Franck Jean Buonanno directly holds 10,000 Ordinary Shares of SEALSQ Corp. The Form 4 lists this figure as the total number of shares owned after the transaction date of March 31, 2026.

Was the SEALSQ (LAES) insider sale made under a Rule 10b5-1 trading plan?

Yes. The footnote states the sales were effected pursuant to a Rule 10b5-1 trading plan adopted on October 13, 2025. Such plans allow insiders to schedule trades in advance, reducing the significance of trade timing as a discretionary decision.

What role does the reporting person hold at SEALSQ (LAES)?

The reporting person, Franck Jean Buonanno, serves as Vice-President, Global Sales at SEALSQ Corp. This officer role is disclosed in the Form 4, which identifies him as an executive but not as a director or ten-percent owner.