SEALSQ (NASDAQ: LAES) CFO sells 30,000 shares under 10b5-1 plan

Rhea-AI Filing Summary

SEALSQ Corp director and CFO John Charles O'Hara reported open-market sales of 30,000 Ordinary Shares of LAES. The transactions occurred on March 23, 24, and 25, 2026, in three blocks of 10,000 shares at weighted average prices of about $2.99, $2.90, and $2.92 per share.

The filing states these sales were effected under a Rule 10b5-1 trading plan adopted on October 17, 2025, indicating they were pre-scheduled. After the most recent transaction, O'Hara continues to hold 165,183 Ordinary Shares directly.

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

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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)
03/23/2026

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	03/23/2026		S(1)		10,000	D	$2.9892(2)	185,183	D
Ordinary Shares	03/24/2026		S(1)		10,000	D	$2.8996(3)	175,183	D
Ordinary Shares	03/25/2026		S(1)		10,000	D	$2.9247(4)	165,183	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 $2.94 to $3.06, 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 $2.84 to $2.96, 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 $2.86 to $3.01, 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	03/25/2026
	** 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 (LAES) report for CFO John O'Hara?

SEALSQ reported that CFO John Charles O'Hara sold 30,000 Ordinary Shares in three open-market transactions. The sales occurred on March 23, 24, and 25, 2026, in 10,000-share blocks at weighted average prices around the high-$2 range per share.

At what prices did SEALSQ (LAES) CFO John O'Hara sell his shares?

John O'Hara sold 10,000 Ordinary Shares at a weighted average price of $2.9892, another 10,000 at $2.8996, and 10,000 at $2.9247. Footnotes note each figure is a weighted average across multiple trades within narrow intraday price ranges.

How many SEALSQ (LAES) shares does CFO John O'Hara hold after the sales?

Following the reported transactions, John O'Hara directly holds 165,183 Ordinary Shares of SEALSQ Corp. This figure reflects his position after selling a total of 30,000 shares over three days in March 2026 through open-market transactions.

Were SEALSQ (LAES) CFO John O'Hara's share sales under a 10b5-1 plan?

Yes. The Form 4 footnote states the sales were effected pursuant to a Rule 10b5-1 trading plan adopted by John O'Hara on October 17, 2025. Such plans pre-schedule trades, making their timing less indicative of short-term market views.

What type of transactions did SEALSQ (LAES) CFO John O'Hara execute?

All reported transactions were open-market sales of non-derivative Ordinary Shares, coded as "S" on the Form 4. No option exercises or derivative conversions were reported, and the derivative section of the filing shows no remaining derivative positions.