Arqit Quantum US general manager sells 494 shares

The General Manager-US had 6,711 restricted share units reported following the conversion.

Rhea-AI Filing Summary

Arqit Quantum Inc. General Manager-US Nicholas William Nilan converted 960 restricted share units into 960 ordinary shares on October 2, 2026, on a one-for-one basis. He sold 494 ordinary shares at $24.4743 per share that day; no Rule 10b5-1 plan is reported. The derivative transaction row reports 6,711 restricted share units following the transaction.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 3 txns

Insider Nilan Nicholas William

Role General Manager-US

Sold 494 shs ($12K)

Approx. gross sale proceeds $12K

Type	Security	Shares	Price	Value
Exercise	Restricted Share Units F2, F1	960	--	--
Sale	Ordinary Shares	494	$24.4743	$12K
Exercise	Ordinary Shares F1	960	$0.00	$0.00

Holdings After Transaction: Restricted Share Units — 6,711 contracts (Direct); Ordinary Shares — 1,426 shares (Direct)

Footnotes (2)

1. F1. The Restricted Share Units ("RSUs") convert into ARQQ ordinary shares on a one-for-one basis.
2. F2. Each restricted stock unit ("RSU") represents a contingent right to receive one ARQQ ordinary share. 2,879 RSUs vest on October 1, 2026 and the remaining RSUs vest quarterly in equal installments on 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 converted: 960 RSUs Ordinary shares acquired on conversion: 960 ordinary shares Ordinary shares sold: 494 ordinary shares +2 more

5 metrics

Restricted share units converted 960 RSUs October 2, 2026

Ordinary shares acquired on conversion 960 ordinary shares October 2, 2026

Ordinary shares sold 494 ordinary shares October 2, 2026

Sale price $24.4743 per share Sale on October 2, 2026

Restricted share units following transaction 6,711 RSUs Reported following the October 2, 2026 transaction

Key Terms

Restricted Share Units, contingent right, one-for-one basis

3 terms

Restricted Share Units technical

"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.

contingent right technical

"Each restricted stock unit ("RSU") represents a contingent right to receive one ARQQ ordinary share."

one-for-one basis technical

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

FAQ

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

How many ARQQ ordinary shares did the General Manager-US sell, and at what price?

Nicholas William Nilan, Arqit Quantum Inc.'s General Manager-US, sold 494 ordinary shares at $24.4743 per share on October 2, 2026; no Rule 10b5-1 plan is reported.

What vesting schedule does Arqit Quantum disclose for these RSUs?

The footnote states that 2,879 RSUs vest on October 1, 2026; the remaining RSUs vest in equal quarterly installments on January 1, April 1, July 1 and October 1, 2027, and on those same dates in 2028.

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

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Available on EDGAR 10/06/2026 - 07:43 PM Accepted by SEC EDGAR 10/06/2026 - 07:43 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^*

Nilan Nicholas William

(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)
	General Manager-US

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/02/2026

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	10/02/2026		S		494	D	$24.4743	466	D
Ordinary Shares	10/02/2026		M		960	A	$0(1)	1,426	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)	10/02/2026		M			960	(2)	(2)	Ordinary Shares	960	(1)	6,711	D

Explanation of Responses:

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

2. Each restricted stock unit ("RSU") represents a contingent right to receive one ARQQ ordinary share. 2,879 RSUs vest on October 1, 2026 and the remaining RSUs vest quarterly in equal installments on 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.

	/s/ Noleen McDonnell, as Attorney-in-Fact	10/06/2026
	** 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)