CFO of SEALSQ Corp (NASDAQ: LAES) sells 20,000 shares under 10b5-1 plan

Rhea-AI Filing Summary

SEALSQ Corp Chief Financial Officer John Charles O'Hara reported selling a total of 20,000 Ordinary Shares of LAES in open-market transactions over two days. He sold 10,000 shares on April 20, 2026 at a weighted average price of $2.7879 per share and another 10,000 shares on April 21, 2026 at a weighted average price of $3.0378 per share. According to the filing, these sales were carried out under a pre-established Rule 10b5-1 trading plan, indicating they were pre-arranged rather than discretionary. Following these transactions, O'Hara directly holds 306,095 Ordinary Shares of SEALSQ Corp.

Insider Trade Summary 10b5-1

Net Seller: 20,000 shares ($58,257)

Net Sell 2 txns

Insider O'Hara John Charles

Role Chief Financial Officer

Sold 20,000 shs ($58K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares	10,000	$3.0378	$30K
Sale	Ordinary Shares	10,000	$2.7879	$28K

Holdings After Transaction: Ordinary Shares — 306,095 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 17, 2025. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.64 to $2.95, 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 $2.95 to $3.22, 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 April 20, 2026: 10,000 shares at $2.7879 Shares sold April 21, 2026: 10,000 shares at $3.0378 Total shares sold: 20,000 shares +1 more

4 metrics

Shares sold April 20, 2026 10,000 shares at $2.7879 Open-market sale of Ordinary Shares

Shares sold April 21, 2026 10,000 shares at $3.0378 Open-market sale of Ordinary Shares

Total shares sold 20,000 shares Two open-market sales reported in Form 4

Shares held after transactions 306,095 shares Direct ownership following April 2026 sales

Key Terms

Rule 10b5-1 trading plan, weighted average price, open-market sale, Ordinary Shares

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.

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.

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^*

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)
04/20/2026

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	04/20/2026(1)		S		10,000	D	$2.7879(2)	316,095	D
Ordinary Shares	04/21/2026(1)		S		10,000	D	$3.0378(3)	306,095	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 17, 2025.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.64 to $2.95, 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 $2.95 to $3.22, 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	04/21/2026
	** 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 its CFO?

SEALSQ Corp reported that CFO John Charles O'Hara sold 20,000 Ordinary Shares. He executed two open-market sales of 10,000 shares each on April 20 and 21, 2026, as disclosed in a Form 4 insider trading report.

At what prices did the SEALSQ (LAES) CFO sell his shares?

The CFO sold 10,000 shares at a weighted average of $2.7879 and 10,000 at $3.0378. The filing notes these were multiple trades within price ranges around those averages, all summarized as single weighted-average prices.

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

After the reported transactions, the CFO directly holds 306,095 Ordinary Shares. This post-transaction balance appears in the Form 4 and shows that the 20,000 shares sold represent only a portion of his total direct holdings.

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

Yes, the filing states the sales were effected under a Rule 10b5-1 trading plan. The plan was adopted by the reporting person on October 17, 2025, indicating the trades were pre-arranged rather than timed on an ad hoc basis.

What does weighted average price mean in the SEALSQ (LAES) Form 4 filing?

The weighted average price reflects multiple trades aggregated into a single average price. The Form 4 explains that each 10,000-share sale was executed in several transactions within stated price ranges, then reported as one weighted-average figure.