SEALSQ CFO sells 14,689 shares in planned trades

SEALSQ Corp Chief Financial Officer John Charles O'Hara reported selling a total of 14,689 ordinary shares of LAES in two open-market transactions.

Rhea-AI Filing Summary

SEALSQ Corp Chief Financial Officer John Charles O'Hara reported selling a total of 14,689 ordinary shares of LAES in two open-market transactions. The sales occurred on May 27 and May 29, 2026 at weighted average prices of about $3.50 per share, within disclosed price ranges between $3.50 and $3.53. These transactions were carried out under a pre-established Rule 10b5-1 trading plan. Following the sales, O'Hara directly holds 266,156 ordinary shares of SEALSQ Corp.

Insider Trade Summary 10b5-1

Net Seller: 14,689 shares

Net Sell 2 txns

Insider O'Hara John Charles

Role Chief Financial Officer

Sold 14,689 shs ($52K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares	10,000	$3.5076	$35K
Sale	Ordinary Shares	4,689	$3.504	$16K

Holdings After Transaction: Ordinary Shares — 266,156 shares (Direct)

Footnotes (3)

1. F1. 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. F2. 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 $3.51, 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. F3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.5 to $3.53, 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 $3.5076 Shares sold May 27, 2026: 4,689 shares at $3.5040 Total shares sold: 14,689 shares +3 more

6 metrics

Shares sold May 29, 2026 10,000 shares at $3.5076 Open-market sale of ordinary shares

Shares sold May 27, 2026 4,689 shares at $3.5040 Open-market sale of ordinary shares

Total shares sold 14,689 shares Combined open-market sales reported in this Form 4

Shares held after transactions 266,156 shares Direct ownership following reported sales

Price range May 29 sales $3.50–$3.51 Weighted average price disclosed with range

Price range May 27 sales $3.50–$3.53 Weighted average price disclosed with range

Key Terms

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

4 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 17, 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. These shares were sold in multiple transactions at prices ranging from $3.50 to $3.51, inclusive."

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" and transaction_code_description: "Sale in open market or private transaction""

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" for the ordinary share sales"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transactions did SEALSQ Corp (LAES) report for its CFO?

SEALSQ Corp reported that CFO John Charles O'Hara sold 14,689 ordinary shares of LAES in two open-market transactions. The trades occurred on May 27 and May 29, 2026, under a pre-arranged Rule 10b5-1 trading plan.

How many SEALSQ (LAES) shares did the CFO sell and at what prices?

The CFO sold 10,000 shares at a weighted average price of $3.5076 and 4,689 shares at $3.5040. Footnotes state these were multiple trades within price ranges between $3.50 and $3.53 per share.

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

After the reported transactions, CFO John Charles O'Hara directly holds 266,156 ordinary shares of SEALSQ Corp. This figure reflects his remaining position following the combined sale of 14,689 shares across the two trading days.

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

Yes, the filing states the sales were effected pursuant to a Rule 10b5-1 trading plan adopted on October 17, 2025. Such plans allow insiders to pre-schedule trades, reducing the significance of short-term market timing.

What type of Form 4 transactions did SEALSQ (LAES) disclose for its CFO?

The Form 4 shows two non-derivative open-market sales of ordinary shares, each coded as an “S” transaction. Both are described as sales in the open market or private transactions, with directly held ownership reported after the trades.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/29/2026 - 04:57 PM Learn about SEC filing dates

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)
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		4,689	D	$3.504(2)	276,156	D
Ordinary Shares	05/29/2026(1)		S		10,000	D	$3.5076(3)	266,156	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 $3.50 to $3.51, 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 $3.5 to $3.53, 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	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)