Arqit Quantum director receives 817-share stock grant

Q: How many ARQQ RSUs did director d'Ovidio Manfredi Lefebvre receive and convert?

He received 817 RSUs on October 15, 2026. They vested within the week of the grant date and converted one-for-one into 817 ordinary shares on October 16, 2026.

Q: How many ARQQ ordinary shares did the director hold after the conversion?

He held 53,924 ordinary shares directly after the conversion. Separately, 8,942,448 ordinary shares were beneficially owned through Heritage Assets SCSP as of October 15, 2026.

The 817 RSUs vested within the week of the grant date and converted one-for-one into ordinary shares.

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Rhea-AI Filing Summary

Arqit Quantum Inc. director d'Ovidio Manfredi Lefebvre received a grant of 817 restricted share units (RSUs) on October 15, 2026; the RSUs vested within the week of the grant date. On October 16, 2026, they converted one-for-one into 817 ordinary shares, leaving him with 53,924 directly held ordinary shares. Separately, 8,942,448 ordinary shares were beneficially owned through Heritage Assets SCSP as of October 15, 2026.

Insider Trade Summary

817 shares exercised/converted

Exercise 4 txns

Insider Lefebvre d'Ovidio Manfredi

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Share Units ^F1	817	$0.00	$0.00
Exercise	Ordinary Shares ^F1	817	$0.00	$0.00
Grant/Award	Restricted Share Units ^F1	817	$0.00	$0.00
holding	Ordinary Shares	--	--	--

Holdings After Transaction: Restricted Share Units — 0 contracts (Direct); Ordinary Shares — 53,924 shares (Direct); Ordinary Shares — 8,942,448 shares (Indirect, beneficially owned through Heritage Assets SCSP)

Footnotes (1)

F1. Restricted Stock Units ("RSUs") convert into ARQQ ordinary shares on a one-for-one basis. The RSUs vested within the week of the grant date.

Key Figures

Restricted share units granted: 817 RSUs Ordinary shares from RSU conversion: 817 shares Direct ordinary shares following conversion: 53,924 shares +1 more

4 metrics

Restricted share units granted 817 RSUs October 15, 2026

Ordinary shares from RSU conversion 817 shares Converted one-for-one on October 16, 2026

Direct ordinary shares following conversion 53,924 shares After the October 16, 2026 conversion

Ordinary shares beneficially owned through Heritage Assets SCSP 8,942,448 shares As of October 15, 2026

Key Terms

Restricted Stock Units, vested, one-for-one basis

3 terms

Restricted Stock Units financial

"Restricted Stock Units ("RSUs") convert into ARQQ ordinary shares"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

vested financial

"The RSUs vested within the week of the grant date."

one-for-one basis financial

"RSUs ("RSUs") convert into ARQQ ordinary shares on a one-for-one basis."

FAQ

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

How many ARQQ RSUs did director d'Ovidio Manfredi Lefebvre receive and convert?

He received 817 RSUs on October 15, 2026. They vested within the week of the grant date and converted one-for-one into 817 ordinary shares on October 16, 2026.

How many ARQQ ordinary shares did the director hold after the conversion?

He held 53,924 ordinary shares directly after the conversion. Separately, 8,942,448 ordinary shares were beneficially owned through Heritage Assets SCSP as of October 15, 2026.

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

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Available on EDGAR 10/20/2026 - 09:38 PM EDT Accepted by SEC EDGAR 10/20/2026 - 09:37 PM EDT

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^*

Lefebvre d'Ovidio Manfredi

(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)

X	Director	10% Owner
	Officer (give title below)	Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/15/2026

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	10/16/2026		M		817	A	$0⁽¹⁾	53,924	D
Ordinary Shares								8,942,448	I	beneficially owned through Heritage Assets SCSP

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	⁽¹⁾	10/15/2026		A		817		⁽¹⁾	⁽¹⁾	Ordinary Shares	817	$0	817	D
Restricted Share Units	⁽¹⁾	10/16/2026		M			817	⁽¹⁾	⁽¹⁾	Ordinary Shares	817	$0	0	D

Explanation of Responses:

1. Restricted Stock Units ("RSUs") convert into ARQQ ordinary shares on a one-for-one basis. The RSUs vested within the week of the grant date.

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. Ex.24 - Power of Attorney

	/s/ Noleen McDonnell, as Attorney-in-Fact	10/20/2026
	** 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