SEALSQ CFO updates insider share holdings baseline

SEALSQ Corp director and CFO John Charles O'Hara filed an amended Form 3 to correct his reported holdings of Ordinary Shares.

Rhea-AI Filing Summary

SEALSQ Corp director and CFO John Charles O'Hara filed an amended Form 3 to correct his reported holdings of Ordinary Shares. The amendment establishes a revised baseline of 215,595 Ordinary Shares held directly. A footnote explains that 412 Ordinary Shares were inadvertently omitted from his original Form 3 and from two subsequent Forms 4, and that past running balances of beneficial ownership should be recalculated using this corrected starting figure.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider O'Hara John Charles

Role Chief Financial Officer

Type	Security	Shares	Price	Value
holding	Ordinary Shares	--	--	--

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

Footnotes (1)

1. F1. 412 Ordinary Shares were inadvertently omitted from the reporting person's original Form 3, and also were omitted from two Forms 4 filed by the reporting person after his original Form 3 was filed.The running balance of beneficial ownership reflected in each such Form 4 should be recalculated by reference to the corrected baseline established by this Form 3/A.

Key Figures

Direct beneficial ownership: 215,595 Ordinary Shares Previously omitted shares: 412 Ordinary Shares Holding entries: 1 entry

3 metrics

Direct beneficial ownership 215,595 Ordinary Shares Total shares reported following the corrected Form 3/A baseline

Previously omitted shares 412 Ordinary Shares Omitted from original Form 3 and two subsequent Forms 4

Holding entries 1 entry Single holding-type entry with unknown transaction direction

Key Terms

Form 3/A, beneficial ownership, Ordinary Shares

3 terms

Form 3/A regulatory

"412 Ordinary Shares were inadvertently omitted from the reporting person's original Form 3"

An amended Form 3 (Form 3/A) is a corrected or updated disclosure filed with regulators that revises an insider’s initial report of their ownership in a public company — typically for officers, directors or large shareholders. Investors use it like a corrected inventory list: it clarifies who owns how many shares and whether earlier reports had errors, helping assess insider confidence, possible conflicts and the accuracy of ownership records that can affect stock valuation and trust.

beneficial ownership financial

"The running balance of beneficial ownership reflected in each such Form 4 should be recalculated"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

Ordinary Shares financial

"412 Ordinary Shares were inadvertently omitted from the reporting person's original Form 3"

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.

FAQ

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

What does SEALSQ Corp (LAES) disclose in this amended Form 3?

SEALSQ Corp reports that director and CFO John Charles O'Hara corrected his initial Form 3. The amendment updates his baseline beneficial ownership to 215,595 Ordinary Shares held directly, reflecting previously omitted shares and aligning future ownership calculations with this corrected starting point.

How many SEALSQ (LAES) shares does John Charles O'Hara now report owning?

The amended filing shows John Charles O'Hara beneficially owns 215,595 Ordinary Shares directly. This figure is the corrected total after adding 412 previously omitted shares, and serves as the new baseline for interpreting his subsequent Form 4 ownership balances and changes.

What error is SEALSQ (LAES) correcting with the 412 Ordinary Shares?

The company states that 412 Ordinary Shares were inadvertently omitted from O'Hara's original Form 3 and from two later Forms 4. As a result, all prior running balances of beneficial ownership should be recalculated using the corrected baseline disclosed in this amended Form 3/A.

Does this SEALSQ (LAES) Form 3/A show new insider buying or selling?

The amended Form 3/A does not report new purchases or sales. Instead, it corrects O'Hara’s previously reported holdings, establishing 215,595 Ordinary Shares as the accurate baseline of direct beneficial ownership for interpreting his historical and future ownership disclosures.

How should investors interpret prior SEALSQ (LAES) Form 4 filings by O'Hara?

The footnote explains that running balances of beneficial ownership in O'Hara’s earlier Forms 4 should be recalculated using the corrected baseline. This means the share-change transactions remain, but starting ownership amounts should now reflect 215,595 Ordinary Shares as corrected.

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

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Accepted by SEC EDGAR 03/30/2026 - 05:32 PM EDT Learn about SEC filing dates

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
Estimated average burden
hours per response:			0.5

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. Date of Event Requiring Statement (Month/Day/Year)
03/18/2026

3. Issuer Name and Ticker or Trading Symbol
SEALSQ Corp [ LAES ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)
03/18/2026

4. 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

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Ordinary Shares	215,595(1)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 412 Ordinary Shares were inadvertently omitted from the reporting person's original Form 3, and also were omitted from two Forms 4 filed by the reporting person after his original Form 3 was filed.The running balance of beneficial ownership reflected in each such Form 4 should be recalculated by reference to the corrected baseline established by this Form 3/A.

	/s/ John O'Hara	03/30/2026
	** 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 5 (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 3: SEC 1473 (03-26)