Arqit Quantum director converts 841 RSUs to shares

Arqit Quantum director Ritchie Garth converted 841 Restricted Share Units into 841 Ordinary Shares on July 17, 2026, at a stated price of 0.0000 per share, with the RSUs converting one-for-one and vesting within the week of grant.

Rhea-AI Filing Summary

Arqit Quantum director Ritchie Garth converted 841 Restricted Share Units into 841 Ordinary Shares on July 17, 2026, at a stated price of 0.0000 per share, with the RSUs converting one-for-one and vesting within the week of grant. After this derivative exercise, he directly holds 105,450 Ordinary Shares. The company notes its status as a foreign private issuer, with these transactions exempt from Sections 16(b) and 16(c) of the Exchange Act.

Insider Trade Summary

841 shares exercised/converted

Exercise 2 txns

Insider Ritchie Garth

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Share Units F1	841	$0.00	$0.00
Exercise	Ordinary Shares F1	841	$0.00	$0.00

Holdings After Transaction: Restricted Share Units — 0 contracts (Direct); Ordinary Shares — 105,450 shares (Direct)

Footnotes (1)

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

RSUs converted: 841 Restricted Share Units Ordinary Shares acquired: 841 Ordinary Shares Shares held after transaction: 105,450 Ordinary Shares +2 more

5 metrics

RSUs converted 841 Restricted Share Units Restricted Share Units converted into Ordinary Shares on July 17, 2026

Ordinary Shares acquired 841 Ordinary Shares Shares received upon RSU conversion on July 17, 2026

Shares held after transaction 105,450 Ordinary Shares Direct Ordinary Share holdings following July 17, 2026 transactions

Stated transaction price 0.0000 per share Recorded price per Ordinary Share in the RSU conversion

Derivative exercises reported 1 Number of derivative exercise/conversion transactions (code M) in this report

Key Terms

Restricted Share Units, foreign private issuer, Section 16(b), Rule 3a12-3(b)

4 terms

Restricted Share Units financial

"Restricted Stock Units (RSUs) convert into ARQQ ordinary shares on a one-for-one basis"

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

"Due to the issuer's status as a foreign private issuer pursuant to Rule 3a12-3(b)"

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.

Section 16(b) regulatory

"transactions in the issuer's securities are exempt from Sections 16(b) and 16(c) of the Act"

A federal rule that requires company insiders—like officers, directors and large shareholders—to return any profits made from buying and selling the company’s stock within a six-month window. It matters to investors because it discourages short-term trades that could exploit non-public information and helps protect outside shareholders by creating a simple, enforceable way to recover unfair gains, much like a rule stopping someone from flipping a limited-edition item for quick profit after getting early access.

Rule 3a12-3(b) regulatory

"status as a foreign private issuer pursuant to Rule 3a12-3(b) under the Exchange Act"

FAQ

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

What insider transaction involving Arqit Quantum (ARQQ) did Ritchie Garth complete?

Director Ritchie Garth converted 841 Restricted Share Units into 841 Ordinary Shares on July 17, 2026. The RSUs converted on a one-for-one basis into Arqit Quantum ordinary shares after vesting within the week of their grant date.

How many Arqit Quantum (ARQQ) Ordinary Shares does Ritchie Garth hold after this transaction?

Following the July 17, 2026 RSU conversion, Ritchie Garth directly holds 105,450 Arqit Quantum Ordinary Shares. This figure represents his reported direct ownership position immediately after the derivative exercise and related acquisition of Ordinary Shares.

What is the conversion ratio between ARQQ Restricted Share Units and Ordinary Shares?

Each Arqit Quantum Restricted Share Unit converts into one Ordinary Share. A footnote states that these RSUs convert into ARQQ ordinary shares on a one-for-one basis, meaning 841 RSUs became 841 Ordinary Shares when they vested.

Were Ritchie Garth’s ARQQ transactions made under a Rule 10b5-1 trading plan?

The Form 4’s Rule 10b5-1 checkbox is not marked, and no footnote describes a trading plan. This indicates the reported RSU conversion and resulting share acquisition are not designated as occurring under a Rule 10b5-1 pre-arranged plan.

What regulatory status of Arqit Quantum (ARQQ) is highlighted in this Form 4?

Arqit Quantum is identified as a foreign private issuer under Rule 3a12-3(b) of the Exchange Act. Because of this status, Ritchie Garth’s transactions are described as exempt from Sections 16(b) and 16(c) of the Act.

What exercise price per share is recorded for the ARQQ RSUs converted by Ritchie Garth?

The RSU conversion into Ordinary Shares shows a stated transaction price of 0.0000 per share. This zero price reflects that the Restricted Share Units converted into shares without an additional cash exercise payment at the time of vesting.

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

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Accepted by SEC EDGAR 07/21/2026 - 02:09 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^*

Ritchie Garth

(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)
07/17/2026

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	07/17/2026		M		841	A	$0(1)	105,450	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	(1)	07/17/2026		M			841	(1)	(1)	Ordinary Shares	841	$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	07/21/2026
	** 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)