Executive at SEALSQ Corp (LAES) sells 20,000 shares under Rule 10b5-1 plan

Rhea-AI Filing Summary

SEALSQ Corp Vice-President of Global Sales Franck Jean Buonanno sold 20,000 Ordinary Shares of LAES in an open-market transaction. The shares were sold at an average price of $2.90 per share, and he now directly holds 10,000 Ordinary Shares after the sale.

The transaction was carried out pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 13, 2025, indicating the sale was pre-scheduled rather than timed at discretion.

Insider Trade Summary 10b5-1

Net Seller: 20,000 shares ($58,000)

Net Sell 1 txn

Insider Buonanno Franck Jean

Role Vice-President, Global Sales

Sold 20,000 shs ($58K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares	20,000	$2.90	$58K

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

Footnotes (1)

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Key Figures

Shares sold: 20,000 shares Sale price per share: $2.90 per share Shares owned after sale: 10,000 shares +1 more

4 metrics

Shares sold 20,000 shares Open-market sale of Ordinary Shares on May 14, 2026

Sale price per share $2.90 per share Average price for the 20,000 Ordinary Shares sold

Shares owned after sale 10,000 shares Directly held Ordinary Shares following the transaction

Net shares sold 20,000 shares Net selling activity reported in the transaction summary

Key Terms

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

4 terms

Rule 10b5-1 trading plan regulatory

"The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person"

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 sale reported in this Form 4 was 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)
05/14/2026

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	05/14/2026(1)		S		20,000	D	$2.9	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 sale reported in this Form 4 was 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	05/15/2026
	** 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 of Global Sales Franck Jean Buonanno sold 20,000 Ordinary Shares. The transaction was an open-market sale and reduced his direct holdings to 10,000 Ordinary Shares following the trade.

At what price were SEALSQ Corp (LAES) shares sold in the latest Form 4?

The reported sale of SEALSQ Corp (LAES) Ordinary Shares was executed at an average price of $2.90 per share. This open-market transaction covered 20,000 shares and left the executive with 10,000 shares directly owned afterward.

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

Following the reported transaction, Franck Jean Buonanno directly holds 10,000 Ordinary Shares of SEALSQ Corp (LAES). Before this, he sold 20,000 shares in an open-market sale at $2.90 per share under a pre-established trading plan.

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

Yes. The filing states the sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 13, 2025. Such plans pre-schedule trades, reducing the role of day-to-day market timing decisions.

What role does the insider in the SEALSQ Corp (LAES) Form 4 hold at the company?

The reporting person in the SEALSQ Corp (LAES) Form 4, Franck Jean Buonanno, serves as Vice-President, Global Sales. The filing links his role with a recent open-market sale of 20,000 Ordinary Shares at $2.90 per share.