Arqit Quantum counsel Willcocks sells 588 shares

The 305 RSUs in one tranche vest in equal quarterly installments, with the schedule ending October 1, 2028.

Available on EDGAR 10/07/2026 - 07:40 PM EDT Accepted by SEC EDGAR 10/07/2026 - 07:40 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Arqit Quantum Inc. General Counsel Patrick Willcocks converted 1,148 restricted share units into 1,148 ordinary shares on October 5, 2026, and sold 588 ordinary shares at $23.7847 per share that day. The units convert one-for-one into ordinary shares; the cited vesting schedules specify equal quarterly installments, with the longest schedule extending through October 1, 2028. No Rule 10b5-1 plan is reported.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 7 txns

Insider Willcocks Patrick

Role General Counsel

Sold 588 shs ($14K)

Approx. gross sale proceeds $14K

Share of Position Sold 4.8%

Type	Security	Shares	Price	Value
Exercise	Restricted Share Units F2	694	$0.00	$0.00
Exercise	Restricted Share Units F3	149	$0.00	$0.00
Exercise	Restricted Share Units F4	305	$0.00	$0.00
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	588	$23.7847	$14K

Holdings After Transaction: Restricted Share Units — 16,990 contracts (Direct); Ordinary Shares — 11,764 shares (Direct)

Holdings Before and After: Restricted Share Units, 18,138 to 16,990 contracts (Direct); Ordinary Shares, 11,204 to 11,764 shares (Direct)

Other Insiders: 5 other insiders reported open-market sales of this stock in the 30 days up to this filing.

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: 588 shares +1 more

4 metrics

Restricted share units converted 1,148 units October 5, 2026

Ordinary shares acquired 1,148 shares October 5, 2026

Ordinary shares sold 588 shares October 5, 2026

Sale price $23.7847 per share October 5, 2026

Key Terms

Restricted Share Units, foreign private issuer, Rule 3a12-3(b), Sections 16(b) and 16(c)

4 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.

foreign private issuer regulatory

"the 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.

Rule 3a12-3(b) regulatory

"pursuant to Rule 3a12-3(b) under the Securities Exchange Act of 1934"

Sections 16(b) and 16(c) regulatory

"exempt from Sections 16(b) and 16(c) of the Act"

FAQ

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

How many ARQQ shares did Patrick Willcocks sell?

General Counsel Patrick Willcocks sold 588 Arqit Quantum Inc. ordinary shares at $23.7847 per share on October 5, 2026.

How many ARQQ shares did Patrick Willcocks receive from RSUs?

General Counsel Patrick Willcocks acquired 1,148 ordinary shares through the conversion of 1,148 restricted share units on October 5, 2026.

What are the ARQQ RSU vesting dates?

The 305-unit RSU tranche vests in equal quarterly installments from October 1, 2026, through October 1, 2028. The 694-unit tranche's listed dates run through October 1, 2027; the 149-unit tranche's listed dates run through July 1, 2027.

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

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

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)
10/05/2026

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	10/05/2026		M		694	A	$0(1)	11,898	D
Ordinary Shares	10/05/2026		M		149	A	$0(1)	12,047	D
Ordinary Shares	10/05/2026		M		305	A	$0(1)	12,352	D
Ordinary Shares	10/05/2026		S		588	D	$23.7847	11,764	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)	10/05/2026		M			694	(2)	(2)	Ordinary Shares	694	$0	8,330	D
Restricted Share Units	(3)	10/05/2026		M			149	(3)	(3)	Ordinary Shares	149	$0	1,336	D
Restricted Share Units	(4)	10/05/2026		M			305	(4)	(4)	Ordinary Shares	305	$0	7,324	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	10/07/2026
	** 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)