Arqit Quantum counsel Willcocks sells 557 shares

The three RSU awards carry separate quarterly vesting schedules, with the longest schedule ending on October 1, 2028.

Rhea-AI Filing Summary

Arqit Quantum Inc. General Counsel Patrick Willcocks converted 1,148 restricted share units into 1,148 ordinary shares on October 2, 2026, on a one-for-one basis. He also sold 557 ordinary shares that day at $24.4743 per share. The reported ordinary-share acquisitions were at $0.0000 per share. The 694-, 149-, and 305-unit awards have quarterly vesting schedules ending October 1, 2027, July 1, 2027, and October 1, 2028, respectively.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 9 txns

Insider Willcocks Patrick

Role General Counsel

Sold 557 shs ($14K)

Approx. gross sale proceeds $14K

Type	Security	Shares	Price	Value
Exercise	Restricted Share Units F2, F1	694	--	--
Exercise	Restricted Share Units F3, F1	149	--	--
Exercise	Restricted Share Units F4, F1	305	--	--
Exercise	Ordinary Shares F1	694	$0.00	$0.00
Exercise	Ordinary Shares F1	149	$0.00	$0.00
Exercise	Ordinary Shares F1	305	$0.00	$0.00
Sale	Ordinary Shares	166	$24.4743	$4K
Sale	Ordinary Shares	70	$24.4743	$2K
Sale	Ordinary Shares	321	$24.4743	$8K

Holdings After Transaction: Restricted Share Units — 18,138 contracts (Direct); Ordinary Shares — 11,204 shares (Direct)

Footnotes (4)

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, and July 1, 2027.
4. F4. 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 converted: 1,148 units Ordinary shares acquired: 1,148 shares Ordinary shares sold: 557 shares +5 more

8 metrics

Restricted share units converted 1,148 units October 2, 2026

Ordinary shares acquired 1,148 shares October 2, 2026

Ordinary shares sold 557 shares October 2, 2026

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

Acquisition price per share $0.0000 per share Ordinary shares acquired on October 2, 2026

Restricted share units in award 694 units Quarterly vesting schedule through October 1, 2027

Restricted share units in award 149 units Quarterly vesting schedule through July 1, 2027

Restricted share units in award 305 units Quarterly vesting schedule through October 1, 2028

Key Terms

Restricted Share Units ("RSUs"), one-for-one basis, foreign private issuer

3 terms

Restricted Share Units ("RSUs") financial

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

one-for-one basis technical

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

foreign private issuer regulatory

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

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.

How many ARQQ shares did Patrick Willcocks sell, and at what price?

Patrick Willcocks sold 557 ARQQ ordinary shares on October 2, 2026, at $24.4743 per share. The sale was reported as not made under a Rule 10b5-1 plan.

How many ARQQ restricted share units did Patrick Willcocks convert?

Patrick Willcocks converted 1,148 restricted share units into 1,148 ordinary shares on October 2, 2026. The RSUs convert into ordinary shares on a one-for-one basis.

When do Patrick Willcocks's ARQQ restricted share units vest?

The 694-unit award vests in equal quarterly installments on October 1, 2026, and January 1, April 1, July 1, and October 1, 2027. The 149-unit award's listed installments extend through July 1, 2027. The 305-unit award includes installments through October 1, 2028.

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

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Available on EDGAR 10/06/2026 - 07:46 PM Accepted by SEC EDGAR 10/06/2026 - 07:46 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^*

Willcocks Patrick

(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 Counsel

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		M		694	A	$0(1)	11,307	D
Ordinary Shares	10/02/2026		M		149	A	$0(1)	11,456	D
Ordinary Shares	10/02/2026		M		305	A	$0(1)	11,761	D
Ordinary Shares	10/02/2026		S		166	D	$24.4743	11,595	D
Ordinary Shares	10/02/2026		S		70	D	$24.4743	11,525	D
Ordinary Shares	10/02/2026		S		321	D	$24.4743	11,204	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			694	(2)	(2)	Ordinary Shares	694	(1)	9,024	D
Restricted Share Units	(3)	10/02/2026		M			149	(3)	(3)	Ordinary Shares	149	(1)	1,485	D
Restricted Share Units	(4)	10/02/2026		M			305	(4)	(4)	Ordinary Shares	305	(1)	7,629	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, and July 1, 2027.

4. 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.

	/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)