Arqit COO sells shares after exercising awards

Arqit Quantum Inc. Chief Operating Officer Ben Simon Wilder reported a combination of option exercises and a small share sale.

Rhea-AI Filing Summary

Arqit Quantum Inc. Chief Operating Officer Ben Simon Wilder reported a combination of option exercises and a small share sale. On July 1, 2026, he exercised derivative awards representing 1,333 Ordinary Shares at a conversion price of $0.00 per share, increasing his direct holdings.

On July 2, 2026, he executed an open-market sale of 769 Ordinary Shares at an average price of $25.2026 per share. Following these transactions, Wilder directly held approximately 3,582.47 Ordinary Shares. Footnotes state that the Restricted Share Units convert into Ordinary Shares on a one-for-one basis and vest in equal quarterly installments through October 1, 2028.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 5 txns

Insider Wilder Ben Simon

Role Chief Operating Officer

Sold 769 shs ($19K)

Approx. gross sale proceeds $19K

Approx. exercise cost $0.00

Type	Security	Shares	Price	Value
Sale	Ordinary Shares	769	$25.2026	$19K
Exercise	Restricted Share Units	833	$0.00	$0.00
Exercise	Restricted Share Units	500	$0.00	$0.00
Exercise	Ordinary Shares	833	$0.00	$0.00
Exercise	Ordinary Shares	500	$0.00	$0.00

Holdings After Transaction: Restricted Share Units — 8,665 contracts (Direct); Ordinary Shares — 3,582.47 shares (Direct)

Footnotes (3)

1. F1. The Restricted Share Units ("RSUs") convert into ARQQ ordinary shares on a one-for-one basis.
2. F2. 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.
3. F3. 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: 769 shares Sale price: $25.2026 per share Post-transaction holdings: 3,582.47 shares +3 more

6 metrics

Shares sold 769 shares Open-market sale of Ordinary Shares on July 2, 2026

Sale price $25.2026 per share Average price for 769 Ordinary Shares sold

Post-transaction holdings 3,582.47 shares Ordinary Shares directly held after reported transactions

RSU exercises (block 1) 500 units/shares Restricted Share Units converting one-for-one into Ordinary Shares

RSU exercises (block 2) 833 units/shares Additional Restricted Share Units converting into Ordinary Shares

Total RSU-related shares exercised 1,333 shares Sum of Ordinary Shares from RSU exercises in this filing

Key Terms

Restricted Share Units, open-market sale, derivative security, vesting

4 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 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.

vesting financial

"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."

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

FAQ

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

What did Arqit Quantum (ARQQ) COO Ben Simon Wilder do in this Form 4 filing?

Ben Simon Wilder reported exercising equity awards and then selling some Arqit Quantum Ordinary Shares. He converted Restricted Share Units into shares and later completed an open-market sale, updating his direct ownership position in ARQQ stock.

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

The COO sold 769 Arqit Quantum Ordinary Shares in an open-market transaction. The reported average sale price was approximately $25.2026 per share, reflecting a relatively modest-sized transaction compared with many executive stock sales.

How many Arqit Quantum (ARQQ) shares does the COO hold after these transactions?

After the reported transactions, the COO directly holds about 3,582.47 Arqit Quantum Ordinary Shares. This figure comes from the Form 4’s post-transaction ownership column, which summarizes his remaining direct position following the sale and exercises.

What equity awards did the Arqit Quantum (ARQQ) COO exercise in this filing?

The filing shows exercises of derivative awards linked to Restricted Share Units. These transactions covered 1,333 units in total, each converting into one Ordinary Share at a conversion price of $0.00 per share, increasing his share count before the subsequent sale.

How do Arqit Quantum (ARQQ) Restricted Share Units convert into shares for the COO?

The footnotes state that each Restricted Share Unit converts into one ARQQ Ordinary Share. The units vest in equal quarterly installments across several dates, and when vested, they can be settled into Ordinary Shares that add to the executive’s direct holdings.

What is the vesting schedule for the Arqit Quantum (ARQQ) COO’s Restricted Share Units?

Footnotes describe quarterly vesting on July 1 and October 1, 2026, and January 1, April 1, July 1, and October 1, 2027. Additional awards vest quarterly from July 1, 2026 through October 1, 2028, providing a staggered long-term equity incentive.

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

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Accepted by SEC EDGAR 07/06/2026 - 04:11 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^*

Wilder Ben Simon

(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 Operating Officer

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		833	A	$0(1)	3,851.47	D
Ordinary Shares	07/01/2026		M		500	A	$0(1)	4,351.47	D
Ordinary Shares	07/02/2026		S		769	D	$25.2026	3,582.47	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			833	(2)	(2)	Ordinary Shares	833	$0	4,165	D
Restricted Share Units	(1)	07/01/2026		M			500	(3)	(3)	Ordinary Shares	500	$0	4,500	D

Explanation of Responses:

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

2. 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.

3. 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

	/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)