Arqit Quantum revenue chief sells 506 shares

The three RSU tranches had vesting schedules ending on October 1, 2027, July 1, 2027, and October 1, 2028.

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Rhea-AI Filing Summary

Arqit Quantum Inc. Chief Revenue Officer Paul Feenan reported that on October 2, 2026, 1,034 restricted share units converted into ordinary shares on a one-for-one basis, and he sold 506 ordinary shares at 24.4743 per share. No Rule 10b5-1 plan is reported.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 9 txns

Insider Feenan Paul

Role Chief Revenue Officer

Sold 506 shs ($12K)

Approx. gross sale proceeds $12K

Type	Security	Shares	Price	Value
Exercise	Restricted Share Units ^{F2, F1}	555	--	--
Exercise	Restricted Share Units ^{F3, F1}	157	--	--
Exercise	Restricted Share Units ^{F4, F1}	322	--	--
Exercise	Ordinary Shares ^F1	555	$0.00	$0.00
Exercise	Ordinary Shares ^F1	157	$0.00	$0.00
Exercise	Ordinary Shares ^F1	322	$0.00	$0.00
Sale	Ordinary Shares	74	$24.4743	$2K
Sale	Ordinary Shares	175	$24.4743	$4K
Sale	Ordinary Shares	257	$24.4743	$6K

Holdings After Transaction: Restricted Share Units — 16,835 contracts (Direct); Ordinary Shares — 20,915 shares (Direct)

Footnotes (4)

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

Ordinary shares acquired on RSU conversion: 1,034 shares Ordinary shares sold: 506 shares Sale price: 24.4743 per share

3 metrics

Ordinary shares acquired on RSU conversion 1,034 shares October 2, 2026

Ordinary shares sold 506 shares October 2, 2026

Sale price 24.4743 per share October 2, 2026

Key Terms

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

3 terms

one-for-one basis technical

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

vest quarterly in equal installments technical

"The RSUs vest quarterly in equal installments"

FAQ

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

How many ARQQ ordinary shares did Paul Feenan sell, and at what price?

Paul Feenan sold 506 Arqit Quantum Inc. ordinary shares on October 2, 2026, at 24.4743 per share. The reported sales were 74, 175 and 257 shares; no Rule 10b5-1 plan is reported.

What were the vesting schedules for Paul Feenan's ARQQ RSUs?

The 555 RSUs vest in equal quarterly installments on October 1, 2026, and January 1, April 1, July 1 and October 1, 2027. The 157 RSUs vest on October 1, 2026, and January 1, April 1 and July 1, 2027. The 322 RSUs vest on October 1, 2026, then January 1, April 1, July 1 and October 1 in both 2027 and 2028.

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

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 10/06/2026 - 07:41 PM Accepted by SEC EDGAR 10/06/2026 - 07:41 PM

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^*

Feenan Paul

(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 Revenue Officer

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Ordinary Shares	10/02/2026		M		555	A	$0⁽¹⁾	20,942	D
Ordinary Shares	10/02/2026		M		157	A	$0⁽¹⁾	21,099	D
Ordinary Shares	10/02/2026		M		322	A	$0⁽¹⁾	21,421	D
Ordinary Shares	10/02/2026		S		74	D	$24.4743	21,347	D
Ordinary Shares	10/02/2026		S		175	D	$24.4743	21,172	D
Ordinary Shares	10/02/2026		S		257	D	$24.4743	20,915	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Share Units	⁽²⁾	10/02/2026		M			555	⁽²⁾	⁽²⁾	Ordinary Shares	555	⁽¹⁾	7,219	D
Restricted Share Units	⁽³⁾	10/02/2026		M			157	⁽³⁾	⁽³⁾	Ordinary Shares	157	⁽¹⁾	1,570	D
Restricted Share Units	⁽⁴⁾	10/02/2026		M			322	⁽⁴⁾	⁽⁴⁾	Ordinary Shares	322	⁽¹⁾	8,046	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)

Source: View Original Filing on SEC EDGAR