Arqit Quantum CEO Andrew Leaver sells 2,818 shares

Q: How many ARQQ shares did Andrew Leaver sell, and at what price?

Andrew Leaver sold 2,818 ordinary shares at 24.4743 per share on October 2, 2026. That day, he also converted 5,208 RSUs into ordinary shares on a one-for-one basis. No Rule 10b5-1 plan is reported.

After the conversion, the chief executive reported 192,708 RSUs remaining; the units vest in quarterly installments through October 1, 2029.

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Rhea-AI Filing Summary

Arqit Quantum Inc. Chief Executive Officer Andrew Leaver converted 5,208 restricted share units into 5,208 ordinary shares on October 2, 2026, on a one-for-one basis. He also sold 2,818 ordinary shares at 24.4743 per share that day. His reported post-transaction balance was 192,708 RSUs, which vest in quarterly installments through October 1, 2029. No Rule 10b5-1 plan is reported.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 3 txns

Insider Leaver Andrew

Role Chief Executive Officer

Sold 2,818 shs ($69K)

Approx. gross sale proceeds $69K

Type	Security	Shares	Price	Value
Exercise	Restricted Share Units ^{F2, F1}	5,208	--	--
Exercise	Ordinary Shares ^F1	5,208	$0.00	$0.00
Sale	Ordinary Shares	2,818	$24.4743	$69K

Holdings After Transaction: Restricted Share Units — 192,708 contracts (Direct); Ordinary Shares — 59,082 shares (Direct)

Footnotes (2)

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, 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: 5,208 units Ordinary shares acquired: 5,208 shares Ordinary shares sold: 2,818 shares +2 more

5 metrics

RSUs converted 5,208 units Converted into ordinary shares on October 2, 2026

Ordinary shares acquired 5,208 shares Received through the one-for-one RSU conversion on October 2, 2026

Ordinary shares sold 2,818 shares Sale on October 2, 2026

Sale price 24.4743 per share Andrew Leaver's ordinary-share sale on October 2, 2026

RSUs after transaction 192,708 units Reported following the October 2, 2026 transaction

Key Terms

Restricted Share Units, one-for-one basis, foreign private issuer

3 terms

one-for-one basis technical

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

foreign private issuer regulatory

"Due to 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.

FAQ

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

How many ARQQ shares did Andrew Leaver sell, and at what price?

Andrew Leaver sold 2,818 ordinary shares at 24.4743 per share on October 2, 2026. That day, he also converted 5,208 RSUs into ordinary shares on a one-for-one basis. No Rule 10b5-1 plan is reported.

When do Andrew Leaver's ARQQ RSUs vest?

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

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

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Available on EDGAR 10/06/2026 - 07:42 PM Accepted by SEC EDGAR 10/06/2026 - 07:42 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^*

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)
10/02/2026

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		5,208	A	$0⁽¹⁾	61,900	D
Ordinary Shares	10/02/2026		S		2,818	D	$24.4743	59,082	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			5,208	⁽²⁾	⁽²⁾	Ordinary Shares	5,208	⁽¹⁾	192,708	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, 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.

	/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