Arqit Quantum director acquires 1,698 RSUs

Arqit Quantum Inc. director Carlo Calabria reported compensation-related equity activity rather than open-market trading.

Rhea-AI Filing Summary

Arqit Quantum Inc. director Carlo Calabria reported compensation-related equity activity rather than open-market trading. On May 6, 2026, he exercised 1,698 Restricted Stock Units (RSUs), which convert into ordinary shares on a one-for-one basis, and received 1,698 ordinary shares at a stated price of $0.00 per share. The filing also shows a new grant of 1,698 RSUs that vested immediately on the grant date. Following these transactions, Calabria holds 110,922 ordinary shares directly, plus the newly granted RSUs as an additional derivative position.

Insider Trade Summary

1,698 shares exercised/converted

Exercise 3 txns

Insider Calabria Carlo

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units	1,698	$0.00	$0.00
Exercise	Restricted Stock Units	1,698	$0.00	$0.00
Exercise	Ordinary Shares	1,698	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 0 contracts (Direct); Ordinary Shares — 110,922 shares (Direct)

Footnotes (1)

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

Key Figures

RSUs converted: 1,698 units New RSU grant: 1,698 units Shares held after transactions: 110,922 shares +1 more

4 metrics

RSUs converted 1,698 units Restricted Stock Units converted into ordinary shares on May 6, 2026

New RSU grant 1,698 units Restricted Stock Units granted and vested immediately on grant date

Shares held after transactions 110,922 shares Ordinary shares directly owned by Carlo Calabria after May 6, 2026

Exercise price per share $0.00 per share Stated price for converting RSUs into ordinary shares

Key Terms

Restricted Stock Units, derivative security, Ordinary Shares

3 terms

Restricted Stock Units financial

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

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.

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.

Ordinary Shares financial

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

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.

FAQ

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

What insider transaction did ARQQ director Carlo Calabria report?

Carlo Calabria reported exercising 1,698 Restricted Stock Units into 1,698 Arqit Quantum ordinary shares and receiving a new grant of 1,698 RSUs. These events are equity compensation movements, not open-market buying or selling of ARQQ stock.

Did Carlo Calabria buy or sell Arqit Quantum (ARQQ) shares on the market?

No, the Form 4 shows no open-market purchases or sales. Calabria’s activity reflects an RSU grant and the conversion of 1,698 RSUs into 1,698 ordinary shares at a stated price of $0.00, typical for stock-based compensation.

How many Arqit Quantum (ARQQ) shares does Carlo Calabria own after this Form 4?

After these transactions, Carlo Calabria directly holds 110,922 Arqit Quantum ordinary shares. This total reflects his position following the conversion of 1,698 RSUs into ordinary shares, as disclosed in the Form 4 filing.

What are the key details of the RSU grant reported for ARQQ?

The filing discloses a grant of 1,698 Restricted Stock Units to Carlo Calabria. The RSUs convert into Arqit Quantum ordinary shares on a one-for-one basis and vested immediately on the grant date, providing compensation in the form of equity rather than cash.

Do the reported RSUs for ARQQ have a conversion ratio or special terms?

Yes, the footnote states that each Restricted Stock Unit converts into one ARQQ ordinary share. The RSUs vested immediately on the date of grant, meaning Calabria earned the right to receive the underlying ordinary shares without a waiting period.

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

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Accepted by SEC EDGAR 05/08/2026 - 05:11 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^*

Calabria Carlo

(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)
05/06/2026

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	05/06/2026		M		1,698	A	$0(1)	110,922	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)	05/06/2026		A		1,698		(1)	(1)	Ordinary Shares	1,698	$0	1,698	D
Restricted Stock Units	(1)	05/06/2026		M			1,698	(1)	(1)	Ordinary Shares	1,698	$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 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)