SEALSQ (LAES) CFO executes 10b5-1 sales, retains 215,595 shares

Rhea-AI Filing Summary

SEALSQ Corp Chief Financial Officer John Charles O'Hara sold 30,000 Ordinary Shares in open-market trades. The sales occurred over three days, with 10,000 shares sold on each of April 7, 8, and 9, 2026 at weighted average prices of $2.1382, $2.1984, and $2.0820 per share, respectively.

The transactions were executed as part of a pre-arranged Rule 10b5-1 trading plan adopted by the reporting person on October 17, 2025. Following these sales, O'Hara directly holds 215,595 Ordinary Shares of SEALSQ Corp.

Insider Trade Summary 10b5-1

Net Seller: 30,000 shares ($64,186)

Net Sell 3 txns

Insider O'Hara John Charles

Role Chief Financial Officer

Sold 30,000 shs ($64K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares	10,000	$2.082	$21K
Sale	Ordinary Shares	10,000	$2.1984	$22K
Sale	Ordinary Shares	10,000	$2.1382	$21K

Holdings After Transaction: Ordinary Shares — 215,595 shares (Direct)

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 $2.11 to $2.31, 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 $2.13 to $2.41, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.025 to $2.12, 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 (4) to this Form 4.

Key Figures

Total shares sold: 30,000 shares Shares sold per day: 10,000 shares April 7 weighted average price: $2.1382 per share +3 more

6 metrics

Total shares sold 30,000 shares Aggregate open-market sales reported on Form 4

Shares sold per day 10,000 shares Each of April 7, 8, and 9, 2026

April 7 weighted average price $2.1382 per share Ordinary Shares sold on April 7, 2026

April 8 weighted average price $2.1984 per share Ordinary Shares sold on April 8, 2026

April 9 weighted average price $2.0820 per share Ordinary Shares sold on April 9, 2026

Shares held after transactions 215,595 shares Direct ownership following final sale

Key Terms

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

3 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..."

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. These shares were sold in multiple transactions..."

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.

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)
04/07/2026

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	04/07/2026		S(1)		10,000	D	$2.1382(2)	235,595	D
Ordinary Shares	04/08/2026		S(1)		10,000	D	$2.1984(3)	225,595	D
Ordinary Shares	04/09/2026		S(1)		10,000	D	$2.082(4)	215,595	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

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 $2.11 to $2.31, 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 $2.13 to $2.41, 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.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.025 to $2.12, 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 (4) to this Form 4.

	/s/ John O'Hara	04/09/2026
	** 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) CFO John Charles O'Hara report in this Form 4?

He reported selling 30,000 SEALSQ Ordinary Shares in open-market transactions. The sales occurred over three consecutive days in April 2026, with 10,000 shares sold each day at weighted average prices slightly above $2 per share.

How many SEALSQ (LAES) shares does the CFO still own after these sales?

After the reported sales, the CFO directly holds 215,595 Ordinary Shares of SEALSQ. This figure reflects his position immediately following the final transaction disclosed in the Form 4, providing context for the scale of the disposals relative to his remaining stake.

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

Yes. The Form 4 states the sales were effected under a Rule 10b5-1 trading plan adopted on October 17, 2025. Such plans pre-schedule trades, indicating these dispositions were arranged in advance rather than timed in response to short-term market developments.

What prices did the SEALSQ (LAES) CFO receive for the shares sold?

The reported prices are weighted averages for each day’s trades. On April 7, 2026, the average was $2.1382; on April 8 it was $2.1984; and on April 9 it was $2.0820, each based on multiple trades within disclosed price ranges.

How many SEALSQ (LAES) shares did the CFO sell in total and over what period?

He sold a total of 30,000 Ordinary Shares over three days. The transactions were 10,000 shares each on April 7, 8, and 9, 2026, all reported as open-market sales of non-derivative Ordinary Shares according to the Form 4.

Are the SEALSQ (LAES) CFO’s reported sale prices exact trade prices?

No. The Form 4 specifies that the prices shown are weighted average prices. Each day’s shares were sold in multiple transactions within price ranges, and detailed per-trade pricing is available on request from the reporting person or SEALSQ.