Arqit Quantum (ARQQ) COO discloses initial RSU grants and share stake

Rhea-AI Filing Summary

Arqit Quantum Inc. Chief Operating Officer Wilder Ben Simon filed an initial ownership report showing direct holdings of restricted stock units (RSUs) and ordinary shares. The filing lists RSUs tied to 5,831 underlying ordinary shares and a second RSU award tied to 5,500 underlying ordinary shares, both with a zero exercise price.

The RSUs vest in equal quarterly installments on specified dates from April 1, 2026 through October 1, 2028, giving him a staged path to receive ordinary shares over time. He also directly holds 2,368.47 ordinary shares. This Form 3 does not reflect any new purchase or sale, only current holdings.

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

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1. Name and Address of Reporting Person^*

Wilder Ben Simon

(Last) (First) (Middle)

C/O ARQIT INC.

1209 ORANGE STREET

(Street)

WILMINGTON 19801

(City) (State) (Zip)

(Country)

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

3. Issuer Name and Ticker or Trading Symbol
Arqit Quantum Inc. [ ARQQ ]

3a. Foreign Trading Symbol

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

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Operating 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	2,368.47	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
Restricted Stock Units	(1)	(1)	Ordinary Shares	5,831	(1)	D
Restricted Stock Units	(2)	(2)	Ordinary Shares	5,500	(2)	D

Explanation of Responses:

1. Each Restricted Stock Unit ("RSU") represents a contingent right to receive one ARQQ ordinary share. The RSUs vest quarterly in equal installments on April 1, July 1, and October 1, 2026, and January 1, April 1, July 1, and October 1, 2027.

2. Each RSU represents a contingent right to receive one ARQQ ordinary share. The RSUs vest quarterly in equal installments on April 1, July 1, and October 1, 2026, and January 1, April 1, July 1, and October 1, 2027, and January 1, April 1, July 1, and October 1, 2028.

Remarks:

Due to the issuer's status as a foreign private issuer pursuant to Rule 3a12-3(b) under the Securities Exchange Act of 1934 (the "Act"), the reporting person's transactions in the issuer's securities are exempt from Sections 16(b) and 16(c) of the Act. Ex. 24 - Power of Attorney

	/s/ Nicholas Pointon, as Attorney-in-Fact	03/18/2026
	** 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)

FAQ

What does the Arqit Quantum Inc. (ARQQ) Form 3 filing show for Wilder Ben Simon?

The Form 3 shows Wilder Ben Simon’s initial reported holdings in ARQQ, including restricted stock units and ordinary shares. It details how many shares are underlying the RSUs and clarifies that this filing records existing ownership, not new market purchases or sales.

How many Arqit Quantum (ARQQ) shares are underlying Wilder Ben Simon’s RSUs?

The filing lists RSUs tied to 5,831 underlying ARQQ ordinary shares and another RSU award tied to 5,500 underlying ordinary shares. Each RSU represents a contingent right to receive one ordinary share, subject to the vesting schedule described in the footnotes.

What vesting schedule applies to Wilder Ben Simon’s ARQQ restricted stock units?

The RSUs vest quarterly in equal installments on April 1, July 1, and October 1, 2026, then January 1, April 1, July 1, and October 1, 2027. A second award also vests on those dates and further on January 1, April 1, July 1, and October 1, 2028.

How many Arqit Quantum (ARQQ) ordinary shares does Wilder Ben Simon directly hold?

The Form 3 states that Wilder Ben Simon directly holds 2,368.47 ARQQ ordinary shares. This figure reflects his direct equity position separate from the restricted stock units, which are contingent rights that convert into ordinary shares as they vest over time.

Does the ARQQ Form 3 for Wilder Ben Simon indicate any insider buying or selling?

The filing does not indicate insider buying or selling activity. It classifies the entries as holdings, with no transaction codes showing open‑market purchases or sales. The Form 3’s purpose here is to disclose his existing RSUs and ordinary share ownership as a company officer.

What role does Wilder Ben Simon hold at Arqit Quantum Inc. (ARQQ) according to the Form 3?

The Form 3 identifies Wilder Ben Simon as an officer of Arqit Quantum Inc., serving as Chief Operating Officer. As an executive, he must report his equity holdings in the company, including restricted stock units and ordinary shares, when he becomes a reporting insider.