Arqit Quantum CEO converts grants into 5,209 shares

RSUs convert into ordinary shares one-for-one, with equal quarterly vesting dates scheduled through October 1, 2029.

Rhea-AI Filing Summary

Arqit Quantum Inc. Chief Executive Officer Andrew Leaver converted 5,209 restricted share units (RSUs) into 5,209 ordinary shares on October 1, 2026, under the one-for-one conversion terms. Afterward, his direct holdings were 56,692 ordinary shares and 197,916 RSUs. The RSUs vest in equal quarterly installments on dates running from July 1, 2026, through October 1, 2029.

Insider Trade Summary

5,209 shares exercised/converted

Exercise 2 txns

Insider Leaver Andrew

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Share Units F2, F1	5,209	--	--
Exercise	Ordinary Shares F1	5,209	$0.00	$0.00

Holdings After Transaction: Restricted Share Units — 197,916 contracts (Direct); Ordinary Shares — 56,692 shares (Direct)

Footnotes (2)

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 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, and January 1, April 1, July 1, and October 1, 2029.

Key Figures

RSUs converted: 5,209 RSUs Ordinary shares received: 5,209 ordinary shares Direct ordinary shares held after transaction: 56,692 ordinary shares +2 more

5 metrics

RSUs converted 5,209 RSUs October 1, 2026

Ordinary shares received 5,209 ordinary shares October 1, 2026

Direct ordinary shares held after transaction 56,692 ordinary shares Andrew Leaver's reported post-transaction holdings

RSUs held after transaction 197,916 RSUs Andrew Leaver's reported post-transaction holdings

Conversion ratio One ordinary share per RSU RSU conversion terms

Key Terms

Restricted Share Units, one-for-one basis, Rule 3a12-3(b)

3 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"

Rule 3a12-3(b) regulatory

"issuer's status as a foreign private issuer pursuant to Rule 3a12-3(b)"

FAQ

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

How many RSUs did ARQQ CEO Andrew Leaver convert?

Andrew Leaver converted 5,209 RSUs into 5,209 ordinary shares on October 1, 2026. The RSUs convert into ordinary shares on a one-for-one basis.

When do ARQQ RSUs vest?

The RSUs vest in equal quarterly installments on July 1 and October 1, 2026; January 1, April 1, July 1 and October 1, 2027; January 1, April 1, July 1 and October 1, 2028; and January 1, April 1, July 1 and October 1, 2029.

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

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Available on EDGAR 10/05/2026 - 08:28 PM Accepted by SEC EDGAR 10/05/2026 - 08:27 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^*

Leaver Andrew

(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 Executive 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		5,209	A	$0(1)	56,692	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			5,209	(2)	(2)	Ordinary Shares	5,209	(1)	197,916	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 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, and January 1, April 1, July 1, and October 1, 2029.

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)