Arqit Quantum Inc. (ARQQ) director converts 757 RSUs into shares

Rhea-AI Filing Summary

Arqit Quantum Inc. director Carlo Calabria exercised 757 restricted share units on July 17, 2026, converting them on a one-for-one basis into 757 ordinary shares at $0.00 per share. The RSUs vested within the week of the grant date. Following the transaction, he directly owns 232,478 ordinary shares. Because Arqit Quantum is a foreign private issuer, these transactions are exempt from Sections 16(b) and 16(c) of the Exchange Act and were not made under a Rule 10b5-1 trading plan.

Insider Trade Summary

Net Buyer: 757 shares

Net Buy 2 txns

Insider Calabria Carlo

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Share Units F1	757	$0.00	$0.00
Exercise	Ordinary Shares F1	757	$0.00	$0.00

Holdings After Transaction: Restricted Share Units — 0 shares (Direct); Ordinary Shares — 232,478 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 exercised: 757.0000 Ordinary shares acquired: 757.0000 Ordinary shares held after transaction: 232478.0000 +1 more

4 metrics

RSUs exercised 757.0000 Restricted Share Units converted into ordinary shares on July 17, 2026

Ordinary shares acquired 757.0000 Ordinary Shares received from RSU conversion on July 17, 2026

Ordinary shares held after transaction 232478.0000 Direct holdings following the July 17, 2026 RSU exercise

RSU exercise price per share 0.0000 Per-share price for RSU conversion into ordinary shares

Key Terms

Restricted Share Units, foreign private issuer, Sections 16(b) and 16(c)

3 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.

Sections 16(b) and 16(c) regulatory

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

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/21/2026 - 02:16 PM Accepted by SEC EDGAR 07/21/2026 - 02:16 PM Learn about SEC filing dates

FAQ

What insider transaction did Arqit Quantum (ARQQ) report for Carlo Calabria?

Carlo Calabria exercised 757 restricted share units (RSUs) into 757 ordinary shares of Arqit Quantum on July 17, 2026. The RSUs converted one-for-one into ordinary shares at $0.00 per share and had vested within the week of their grant date.

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

After the reported transaction, Carlo Calabria directly owns 232,478 ordinary shares of Arqit Quantum. This reflects the addition of 757 ordinary shares received from the conversion of vested RSUs, with no same-day sales reported in this filing.

What were the terms of the Arqit Quantum (ARQQ) RSUs in Carlo Calabria’s transaction?

The reported RSUs convert into ARQQ ordinary shares on a one-for-one basis and vested within the week of the grant date. Calabria exercised 757 RSUs at $0.00 per share, receiving 757 ordinary shares and eliminating those RSUs from his derivative holdings.

Was Carlo Calabria’s Arqit Quantum (ARQQ) transaction made under a Rule 10b5-1 trading plan?

The Form 4 indicates the transaction was not made pursuant to a Rule 10b5-1 trading plan. The document’s Rule 10b5-1 checkbox is unchecked, and no footnotes describe any pre-arranged trading arrangement for the reported RSU exercise.

Why are Carlo Calabria’s Arqit Quantum (ARQQ) trades exempt from Sections 16(b) and 16(c)?

The issuer is described as a foreign private issuer under Rule 3a12-3(b) of the Exchange Act. As a result, Calabria’s transactions in Arqit Quantum securities are stated to be exempt from the short-swing profit rules in Sections 16(b) and 16(c).

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)
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		757	A	$0(1)	232,478	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			757	(1)	(1)	Ordinary Shares	757	$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)