Arqit Quantum CEO Andrew Leaver sells 2,535 shares

Leaver's RSUs vest quarterly in equal installments through October 1, 2029, while a related trade corrected an October 2 sell-to-cover transaction.

Rhea-AI Filing Summary

Arqit Quantum Inc. Chief Executive Officer Andrew Leaver reported transactions on October 5, 2026, including conversion of 5,208 restricted share units into ordinary shares and a sale of 2,535 ordinary shares at $23.7847 per share. Other entries report an acquisition of 5,209 RSUs, a disposition involving 5,208 RSUs, and dispositions of 5,209 and 2,818 ordinary shares. A related footnote says a trade cancelled an October 2 sell-to-cover transaction to correct the tax rate and number of units sold. RSUs convert one-for-one into ordinary shares.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 6 txns

Insider Leaver Andrew

Role Chief Executive Officer

Sold 2,535 shs ($60K)

Approx. gross sale proceeds $60K

Type	Security	Shares	Price	Value
Other	Restricted Share Units F4, F1, F2	5,209	$0.00	$0.00
Exercise	Restricted Share Units F4	5,208	$0.00	$0.00
Sale	Ordinary Shares	2,535	$23.7847	$60K
Other	Ordinary Shares F1, F2	5,209	$0.00	$0.00
Exercise	Ordinary Shares F2	5,208	$0.00	$0.00
Other	Ordinary Shares F1, F3	2,818	$24.4743	$69K

Holdings After Transaction: Restricted Share Units — 192,709 contracts (Direct); Ordinary Shares — 53,728 shares (Direct)

Footnotes (4)

1. F1. This trade cancelled out the transaction from October 2, 2026 to correct the applicable tax rate and number of units required to be sold in a sell-to-cover transaction.
2. F2. The Restricted Share Units ("RSUs") convert into ARQQ ordinary shares on a one-for-one basis.
3. F3. The price for acquiring these ordinary shares is the same price that the units were sold for on October 2.
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, and January 1, April 1, July 1, and October 1, 2029.

Key Figures

Ordinary shares sold: 2,535 shares Sale price: $23.7847 per share RSUs acquired: 5,209 units +3 more

6 metrics

Ordinary shares sold 2,535 shares Andrew Leaver, October 5, 2026

Sale price $23.7847 per share Ordinary share sale on October 5, 2026

RSUs acquired 5,209 units Andrew Leaver, October 5, 2026

RSUs in conversion 5,208 units Converted into 5,208 ordinary shares on October 5, 2026

Ordinary shares in other disposition 5,209 shares Andrew Leaver, October 5, 2026

Ordinary shares in other disposition 2,818 shares Andrew Leaver, October 5, 2026

Key Terms

Restricted Share Units, sell-to-cover transaction, one-for-one basis, foreign private issuer

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.

sell-to-cover transaction technical

"units required to be sold in a sell-to-cover transaction"

A sell-to-cover transaction is when a person granted company stock (for example as part of compensation or option exercise) immediately sells enough of those shares to pay required taxes or exercise costs and keeps the rest. Think of it like cashing part of a bonus to cover the tax bill; it provides necessary cash without the holder needing outside funds. Investors watch these sales because they increase trading volume and slightly reduce insider holdings, but they often reflect routine tax or cost management rather than a judgment on the company’s prospects.

one-for-one basis technical

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

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.

FAQ

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

How many ARQQ shares did CEO Andrew Leaver sell?

Andrew Leaver reported selling 2,535 ordinary shares on October 5, 2026, at $23.7847 per share. No Rule 10b5-1 plan is reported.

When do ARQQ CEO Andrew Leaver’s RSUs vest?

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

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

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Available on EDGAR 10/07/2026 - 07:53 PM Accepted by SEC EDGAR 10/07/2026 - 07:52 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^*

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)
10/05/2026

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		S		2,535	D	$23.7847	56,547	D
Ordinary Shares	10/05/2026		J(1)		5,209	D	$0(2)	51,338	D
Ordinary Shares	10/05/2026		M		5,208	A	$0(2)	56,546	D
Ordinary Shares	10/05/2026		J(1)		2,818	D	$24.4743(3)	53,728	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	(4)	10/05/2026		J(1)		5,209		(4)	(4)	Ordinary Shares	5,209	$0(2)	197,917	D
Restricted Share Units	(4)	10/05/2026		M			5,208	(4)	(4)	Ordinary Shares	5,208	$0	192,709	D

Explanation of Responses:

1. This trade cancelled out the transaction from October 2, 2026 to correct the applicable tax rate and number of units required to be sold in a sell-to-cover transaction.

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

3. The price for acquiring these ordinary shares is the same price that the units were sold for on October 2.

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, 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	10/07/2026
	** 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)