SEALSQ Corp (LAES) CEO sells 14,139 shares in planned open-market trades

Rhea-AI Filing Summary

SEALSQ Corp Chief Executive Officer Carlos Moreira reported open-market sales of a total of 14,139 Ordinary Shares of LAES. He sold 4,139 shares on May 27, 2026 at a weighted average price of $3.5039 per share and 10,000 shares on May 29, 2026 at a weighted average price of $3.5086 per share.

After these transactions, Moreira directly holds 713,520 Ordinary Shares. The filing notes that these sales were carried out under a pre-arranged Rule 10b5-1 trading plan adopted on October 12, 2025, indicating they were scheduled in advance rather than timed discretionarily.

Insider Trade Summary 10b5-1

Net Seller: 14,139 shares ($49,589)

Net Sell 2 txns

Insider Moreira Carlos

Role Chief Executive Officer

Sold 14,139 shs ($50K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares	10,000	$3.5086	$35K
Sale	Ordinary Shares	4,139	$3.5039	$15K

Holdings After Transaction: Ordinary Shares — 713,520 shares (Direct, null)

Footnotes (1)

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 12, 2025. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.50 to $3.515, inclusive. The reporting person undertakes to provide to SEALSQ Corp, any security holder of SEALSQ Corp, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.50 to $3.66, inclusive. The reporting person undertakes to provide to SEALSQ Corp, any security holder of SEALSQ Corp, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (3) to this Form 4.

Key Figures

Shares sold May 29, 2026: 10,000 shares at $3.5086 Shares sold May 27, 2026: 4,139 shares at $3.5039 Total shares sold: 14,139 shares +3 more

6 metrics

Shares sold May 29, 2026 10,000 shares at $3.5086 Open-market sale of Ordinary Shares

Shares sold May 27, 2026 4,139 shares at $3.5039 Open-market sale of Ordinary Shares

Total shares sold 14,139 shares Net shares sold across two transactions

Post-transaction holdings 713,520 shares Ordinary Shares directly owned after sales

Price range footnote 1 $3.50–$3.515 Weighted average price range for one sale batch

Price range footnote 2 $3.50–$3.66 Weighted average price range for another sale batch

Key Terms

Rule 10b5-1 trading plan, weighted average price, open-market sale, non-derivative, +1 more

5 terms

Rule 10b5-1 trading plan regulatory

"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 12, 2025."

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.

weighted average price financial

"The price reported in Column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

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.

non-derivative financial

"transaction_type: "non-derivative""

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 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^*

Moreira Carlos

(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 Executive Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/27/2026

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	05/27/2026(1)		S		4,139	D	$3.5039(2)	723,520	D
Ordinary Shares	05/29/2026(1)		S		10,000	D	$3.5086(3)	713,520	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 12, 2025.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.50 to $3.515, inclusive. The reporting person undertakes to provide to SEALSQ Corp, any security holder of SEALSQ Corp, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2) to this Form 4.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.50 to $3.66, inclusive. The reporting person undertakes to provide to SEALSQ Corp, any security holder of SEALSQ Corp, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (3) to this Form 4.

	/s/ John O'Hara, Attorney-in-Fact	05/29/2026
	** 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

How many SEALSQ Corp (LAES) shares did CEO Carlos Moreira sell?

Carlos Moreira sold a total of 14,139 Ordinary Shares of SEALSQ Corp. The transactions included 4,139 shares on May 27, 2026 and 10,000 shares on May 29, 2026, all reported as open-market sales.

At what prices did SEALSQ Corp (LAES) CEO sell his shares?

The CEO sold shares at weighted average prices near $3.50 per share. He sold 4,139 shares at $3.5039 on May 27, 2026 and 10,000 shares at $3.5086 on May 29, 2026, with trades executed in multiple price ranges.

How many SEALSQ Corp (LAES) shares does the CEO hold after these sales?

After the reported sales, Carlos Moreira directly holds 713,520 Ordinary Shares of SEALSQ Corp. This figure reflects his remaining direct ownership position following the two open-market sale transactions disclosed in the Form 4.

Were the SEALSQ Corp (LAES) CEO share sales under a Rule 10b5-1 plan?

Yes, the filing states the sales were made under a Rule 10b5-1 trading plan. The plan was adopted on October 12, 2025, indicating the transactions were pre-arranged rather than newly decided at the time of sale.

What type of transactions did SEALSQ Corp (LAES) report in this Form 4?

The Form 4 reports open-market sales of non-derivative Ordinary Shares by CEO Carlos Moreira. Both transactions are coded as “S,” which denotes sales in open-market or private transactions under SEC reporting conventions.

Does the SEALSQ Corp (LAES) Form 4 mention multiple trade prices?

Yes, the filing notes that reported prices are weighted averages over multiple trades. It states shares were sold in ranges such as $3.50 to $3.515 and $3.50 to $3.66, and offers to provide detailed trade data upon request.