Arqit Quantum COO converts grants into 445 shares

The two RSU awards have quarterly vesting schedules that extend through October 1, 2027 and October 1, 2028, respectively.

Rhea-AI Filing Summary

Arqit Quantum Inc. Chief Operating Officer Ben Simon Wilder reported that 445 restricted share units vested on October 1, 2026, converting one-for-one into 445 ordinary shares. The 278 RSUs vest in equal quarterly installments on October 1, 2026, and January 1, April 1, July 1 and October 1, 2027; the 167 RSUs follow quarterly installments through October 1, 2028.

Insider Trade Summary

445 shares exercised/converted

Exercise 4 txns

Insider Wilder Ben Simon

Role Chief Operating Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Share Units F2, F1	278	--	--
Exercise	Restricted Share Units F3, F1	167	--	--
Exercise	Ordinary Shares F1	278	$0.00	$0.00
Exercise	Ordinary Shares F1	167	$0.00	$0.00

Holdings After Transaction: Restricted Share Units — 8,220 contracts (Direct); Ordinary Shares — 4,027.47 shares (Direct)

Footnotes (3)

1. F1. The Restricted Share Units ("RSUs") convert into ARQQ ordinary shares on a one-for-one basis.
2. F2. The RSUs vest quarterly in equal installments on October 1, 2026, and January 1, April 1, July 1, and October 1, 2027.
3. F3. The RSUs vest quarterly in equal installments on 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.

Key Figures

Restricted share units vested: 445 restricted share units RSUs in first award: 278 RSUs RSUs in second award: 167 RSUs +1 more

4 metrics

Restricted share units vested 445 restricted share units October 1, 2026

RSUs in first award 278 RSUs Vesting schedule through October 1, 2027

RSUs in second award 167 RSUs Vesting schedule through October 1, 2028

RSU conversion ratio 1 RSU for 1 ordinary share RSUs convert into ordinary shares

Key Terms

Restricted Share Units, one-for-one basis, vest quarterly in equal installments, foreign private issuer

4 terms

Restricted Share Units financial

"The Restricted Share Units ("RSUs") convert into ARQQ ordinary shares"

Restricted share units (RSUs) are a promise from a company to give an employee or service provider actual shares or cash equal to the shares after certain conditions are met, typically staying with the company for a set time or hitting performance targets. Think of them like a time-locked gift card that becomes usable only after you’ve earned it. For investors, RSUs matter because they align employee incentives with company performance and can increase the number of shares outstanding over time, diluting existing ownership and affecting earnings per share.

one-for-one basis financial

"convert into ARQQ ordinary shares on a one-for-one basis"

vest quarterly in equal installments financial

"The RSUs vest quarterly in equal installments"

foreign private issuer regulatory

"issuer's status as a foreign private issuer"

A foreign private issuer is a company organized outside the United States that meets tests showing it is primarily foreign-controlled and therefore qualifies for a different set of U.S. reporting rules. For investors, that means the company files less frequent or differently formatted disclosures with U.S. regulators and may follow home-country accounting and governance practices, so buying its stock is like dining at a well-reviewed restaurant that follows its home kitchen’s rules instead of the local menu — you get access but should check what standards apply.

FAQ

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

What RSU transaction did ARQQ COO Ben Simon Wilder report?

Ben Simon Wilder reported that 445 restricted share units vested and converted into 445 ordinary shares on October 1, 2026. The RSUs convert into ordinary shares on a one-for-one basis.

When are the ARQQ RSUs scheduled to vest?

The 278 RSUs vest in equal quarterly installments on October 1, 2026, and January 1, April 1, July 1 and October 1, 2027. The 167 RSUs vest in equal quarterly installments on October 1, 2026, and January 1, April 1, July 1 and October 1 in both 2027 and 2028.

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

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Available on EDGAR 10/05/2026 - 08:24 PM Accepted by SEC EDGAR 10/05/2026 - 08:24 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).

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^*

Wilder Ben Simon

(Last) (First) (Middle)

3 ORCHARD PLACE

(Street)

LONDON SW1H 0BF

(City) (State) (Zip)

UNITED KINGDOM

(Country)

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

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Operating Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2026

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	10/01/2026		M		278	A	$0(1)	3,860.47	D
Ordinary Shares	10/01/2026		M		167	A	$0(1)	4,027.47	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
Restricted Share Units	(2)	10/01/2026		M			278	(2)	(2)	Ordinary Shares	278	(1)	3,887	D
Restricted Share Units	(3)	10/01/2026		M			167	(3)	(3)	Ordinary Shares	167	(1)	4,333	D

Explanation of Responses:

1. The Restricted Share Units ("RSUs") convert into ARQQ ordinary shares on a one-for-one basis.

2. The RSUs vest quarterly in equal installments on October 1, 2026, and January 1, April 1, July 1, and October 1, 2027.

3. The RSUs vest quarterly in equal installments on 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/ Noleen McDonnell, as Attorney-in-Fact	10/05/2026
	** 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)