Arqit Quantum director exercises 1,887 RSUs into shares

Arqit Quantum Inc. director Garth Ritchie reported equity compensation activity involving Restricted Stock Units (RSUs) and ordinary shares.

Rhea-AI Filing Summary

Arqit Quantum Inc. director Garth Ritchie reported equity compensation activity involving Restricted Stock Units (RSUs) and ordinary shares. He exercised 1,887 RSUs, converting them into 1,887 ordinary shares at a stated price of $0.0000 per share, and his directly held ordinary shares increased to 30,687 after the transaction.

On the same date, he was granted 1,887 new RSUs that each convert into one ordinary share of ARQQ. According to the footnote, these RSUs vest immediately on the grant date and convert into ordinary shares on a one-for-one basis, meaning each RSU represents one future ordinary share once settled.

Insider Trade Summary

1,887 shares exercised/converted

Exercise 3 txns

Insider Ritchie Garth

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units	1,887	$0.00	$0.00
Exercise	Restricted Stock Units	1,887	$0.00	$0.00
Exercise	Ordinary Shares	1,887	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 0 contracts (Direct); Ordinary Shares — 30,687 shares (Direct)

Footnotes (1)

1. F1. Restricted Stock Units ("RSUs") convert into ARQQ ordinary shares on a one-for-one bases. The RSUs vest immediately on the date of grant.

Key Figures

RSUs exercised: 1,887 units Shares received from exercise: 1,887 shares Shares held after transaction: 30,687 shares +2 more

5 metrics

RSUs exercised 1,887 units Converted into ordinary shares on May 7, 2026

Shares received from exercise 1,887 shares Ordinary Shares acquired from RSU conversion

Shares held after transaction 30,687 shares Direct Ordinary Shares following RSU exercise

New RSU grant 1,887 units Restricted Stock Units granted and immediately vesting

Exercise price $0.0000 per share Stated price for RSU conversion into Ordinary Shares

Key Terms

Restricted Stock Units, Ordinary Shares, derivative security, grant, award, or other acquisition

4 terms

Restricted Stock Units financial

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

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.

Ordinary Shares financial

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

Ordinary shares are a type of ownership stake in a company, giving shareholders a right to participate in the company’s profits and decision-making through voting. They are similar to owning a piece of a business, and their value can rise or fall based on the company's performance. Investors buy ordinary shares to potentially earn dividends and benefit from the company's growth over time.

derivative security financial

"transaction_code_description": "Exercise or conversion of derivative security""

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

grant, award, or other acquisition financial

"transaction_code_description": "Grant, award, or other acquisition""

FAQ

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

What did ARQQ director Garth Ritchie report in this Form 4 filing?

Garth Ritchie reported an exercise of 1,887 Restricted Stock Units (RSUs) into 1,887 ordinary shares and a grant of 1,887 new RSUs. These transactions are equity compensation-related, not open-market buying or selling of Arqit Quantum Inc. stock.

How many Arqit Quantum (ARQQ) shares does Garth Ritchie hold after these transactions?

After exercising RSUs, Garth Ritchie directly holds 30,687 ordinary shares of Arqit Quantum Inc. This post-transaction figure reflects his updated common share position as reported in the Form 4, excluding any future conversions of newly granted RSUs.

What RSU grant did Garth Ritchie receive from Arqit Quantum (ARQQ)?

Garth Ritchie received a grant of 1,887 Restricted Stock Units. Each RSU converts into one Arqit Quantum ordinary share, vests immediately on the grant date, and represents additional equity compensation rather than a cash transaction in the open market.

How were Garth Ritchie’s Arqit Quantum (ARQQ) RSUs exercised in this filing?

He exercised 1,887 Restricted Stock Units, converting them into 1,887 ordinary shares at a stated price of $0.0000 per share. This reflects settlement of equity awards, turning derivative compensation into directly held common shares of Arqit Quantum Inc.

Do the Arqit Quantum (ARQQ) RSUs in this Form 4 vest over time?

The footnote states that the Restricted Stock Units vest immediately on the date of grant. This means the 1,887 newly granted RSUs are fully vested at grant, with each RSU convertible into one ordinary share of Arqit Quantum Inc.

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

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Accepted by SEC EDGAR 05/08/2026 - 05:37 PM EDT 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)
05/07/2026

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	05/07/2026		M		1,887	A	$0(1)	30,687	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 Stock Units	(1)	05/07/2026		A		1,887		(1)	(1)	Ordinary Shares	1,887	$0	1,887	D
Restricted Stock Units	(1)	05/07/2026		M			1,887	(1)	(1)	Ordinary Shares	1,887	$0	0	D

Explanation of Responses:

1. Restricted Stock Units ("RSUs") convert into ARQQ ordinary shares on a one-for-one bases. The RSUs vest immediately on the date of grant.

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	05/08/2026
	** 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)