Director at Arqit Quantum (ARQQ) sells shares after exercising RSUs

Rhea-AI Filing Summary

Arqit Quantum Inc. director Ritchie Garth reported a combination of equity award exercises and a small share sale. On July 1, 2026, he exercised multiple Restricted Share Units (RSUs) that convert into ordinary shares on a one-for-one basis, moving an aggregate of 799 RSUs into ordinary shares at a conversion price of $0.00 per share.

Following these exercises, on July 2, 2026, he executed an open-market sale of 439 ordinary shares at an average price of $25.2026 per share. After the reported transactions, Garth directly holds 104,609 ordinary shares of Arqit Quantum Inc.

Insights

Equity compensation and insider-trading analyst

Director exercised RSUs and sold a modest number of shares while retaining a large stake.

The filing shows director Ritchie Garth exercising RSU-based awards that convert into ordinary shares of Arqit Quantum Inc. on a one-for-one basis. On July 1, 2026, he moved 799 RSUs into ordinary shares at a conversion price of $0.00, consistent with equity compensation rather than a market purchase.

On July 2, 2026, he then sold 439 ordinary shares at $25.2026 per share in an open-market or private transaction. After these moves, his reported direct holdings total 104,609 ordinary shares, indicating that only a small fraction of his stake was sold in this sequence.

The transaction pattern is typical of an equity award vest-and-sell cycle, where an insider converts awards to shares and sells a portion for liquidity while keeping a substantial position. The filing does not reference any Rule 10b5-1 trading plan in the provided excerpt, so the timing context beyond this pattern is not indicated here.

Insider Trade Summary

Net Seller: 439 shares ($11,064)

Net Sell 9 txns

Insider Ritchie Garth

Role null

Sold 439 shs ($11K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares	439	$25.2026	$11K
Exercise	Restricted Share Units	50	$0.00	--
Exercise	Restricted Share Units	250	$0.00	--
Exercise	Restricted Share Units	250	$0.00	--
Exercise	Restricted Share Units	249	$0.00	--
Exercise	Ordinary Shares	50	$0.00	--
Exercise	Ordinary Shares	250	$0.00	--
Exercise	Ordinary Shares	250	$0.00	--
Exercise	Ordinary Shares	249	$0.00	--

Holdings After Transaction: Ordinary Shares — 104,609 shares (Direct, null); Restricted Share Units — 0 shares (Direct, null)

Footnotes (1)

1. The Restricted Share Units ("RSUs") convert into ARQQ ordinary shares on a one-for-one basis. The RSUs vested on July 1, 2026. The RSUs vest quarterly in equal installments on July 1 and October 1, 2026, and January 1, April 1, and July 1, 2027. The RSUs vest quarterly in equal installments on July 1 and October 1, 2026, and January 1, April 1, July 1, and October 1, 2027. The RSUs vest quarterly in equal installments on July 1, and 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.

Key Figures

Shares sold: 439 ordinary shares Sale price: $25.2026 per share Holdings after transaction: 104,609 ordinary shares +2 more

5 metrics

Shares sold 439 ordinary shares Open-market or private sale on July 2, 2026

Sale price $25.2026 per share Average price for 439 shares sold on July 2, 2026

Holdings after transaction 104,609 ordinary shares Direct ownership following reported transactions

RSUs converted 799 RSUs RSUs exercised into ordinary shares at $0.00 on July 1, 2026

RSU conversion price $0.00 per share Conversion of RSUs into Arqit ordinary shares

Key Terms

Restricted Share Units, open-market sale, derivative exercise/conversion, derivative security, +1 more

5 terms

Restricted Share Units financial

"The Restricted Share 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.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

derivative exercise/conversion financial

"transaction_action": "derivative exercise/conversion""

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.

vest quarterly in equal installments financial

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/06/2026 - 05:19 PM Accepted by SEC EDGAR 07/06/2026 - 05:18 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)
07/01/2026

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	07/01/2026		M		50	A	$0(1)	104,299	D
Ordinary Shares	07/01/2026		M		250	A	$0(1)	104,549	D
Ordinary Shares	07/01/2026		M		250	A	$0(1)	104,799	D
Ordinary Shares	07/01/2026		M		249	A	$0(1)	105,048	D
Ordinary Shares	07/02/2026		S		439	D	$25.2026	104,609	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)	07/01/2026		M			50	(2)	(2)	Ordinary Shares	50	$0	0	D
Restricted Share Units	(1)	07/01/2026		M			250	(3)	(3)	Ordinary Shares	250	$0	1,000	D
Restricted Share Units	(1)	07/01/2026		M			250	(4)	(4)	Ordinary Shares	250	$0	1,251	D
Restricted Share Units	(1)	07/01/2026		M			249	(5)	(5)	Ordinary Shares	249	$0	2,250	D

Explanation of Responses:

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

2. The RSUs vested on July 1, 2026.

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

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

5. The RSUs vest quarterly in equal installments on July 1, and 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.

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 Ex. 24 - Power of Attorney

	/s/ Noleen McDonnell, as Attorney-in-Fact	07/06/2026
	** 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)

FAQ

What insider transaction did Arqit Quantum Inc. (ARQQ) report for director Ritchie Garth?

Arqit Quantum Inc. reported that director Ritchie Garth exercised RSU-based awards into ordinary shares on July 1, 2026 and then sold 439 ordinary shares on July 2, 2026 in an open-market or private transaction at $25.2026 per share.

How many Arqit Quantum (ARQQ) shares did the director sell and at what price?

Director Ritchie Garth sold 439 ordinary shares of Arqit Quantum Inc. at an average price of $25.2026 per share on July 2, 2026. This sale followed RSU exercises that converted equity awards into ordinary shares at a conversion price of $0.00.

How many Arqit Quantum Inc. (ARQQ) shares does the director hold after the Form 4 transactions?

After the reported transactions, director Ritchie Garth directly holds 104,609 ordinary shares of Arqit Quantum Inc. This figure reflects his position following both the RSU exercises on July 1, 2026 and the subsequent sale of 439 shares on July 2, 2026.

What happened with the Restricted Share Units (RSUs) in the Arqit Quantum (ARQQ) Form 4?

The Form 4 shows multiple Restricted Share Unit (RSU) transactions on July 1, 2026. These RSUs convert into Arqit Quantum ordinary shares on a one-for-one basis at a conversion price of $0.00, consistent with vesting and settlement of equity compensation grants.

Were the Arqit Quantum (ARQQ) director’s transactions open-market trades or equity award exercises?

The filing reflects both activities. On July 1, 2026, director Ritchie Garth executed multiple M-code transactions, exercising RSU-based derivative positions into ordinary shares. On July 2, 2026, he completed an S-code open-market or private sale of 439 ordinary shares at $25.2026.

Do the Arqit Quantum Inc. (ARQQ) RSUs have a stated vesting schedule in the filing excerpt?

Yes. Footnotes explain that certain RSUs vested on July 1, 2026, while others vest quarterly in equal installments on specific dates in 2026, 2027, and 2028. These details outline the ongoing equity compensation schedule for the director’s RSU awards.