Arqit Quantum (ARQQ) director acquires 799 shares via RSU vesting

Rhea-AI Filing Summary

Arqit Quantum Inc. director Carlo Calabria reported the vesting and exercise of restricted share units into ordinary shares. On July 1, 2026, multiple RSU awards converted into a total of 799 ordinary shares at an exercise price of 0.0000 per share, classified as derivative exercises rather than open‑market purchases.

Following these transactions, Calabria directly owned 230,972 ordinary shares. Footnotes state that the RSUs convert into ordinary shares on a one‑for‑one basis and vest in equal quarterly installments on dates running through 2028, indicating a scheduled compensation program rather than discretionary trading.

Insider Trade Summary

799 shares exercised/converted

Mixed 8 txns

Insider Calabria Carlo

Role null

Type	Security	Shares	Price	Value
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: Restricted Share Units — 0 shares (Direct, null); Ordinary Shares — 230,972 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

RSU exercises: 799 shares Post-transaction holdings: 230,972 shares Exercise price: 0.0000 per share +2 more

5 metrics

RSU exercises 799 shares Total ordinary shares from RSU exercises on July 1, 2026

Post-transaction holdings 230,972 shares Ordinary shares directly owned after final transaction

Exercise price 0.0000 per share Price per share for RSU-to-share conversion

Derivative exercises count 4 transactions Exercise or conversion of derivative securities (code M)

Acquire transactions 8 entries All reported as acquisition-type transactions on Form 4

Key Terms

Restricted Share Units, Ordinary Shares, vested, quarterly in equal installments

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.

Ordinary Shares financial

"The Restricted Share Units ("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.

vested financial

"The RSUs vested on July 1, 2026."

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 - 06:10 PM Accepted by SEC EDGAR 07/06/2026 - 06:09 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^*

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)
07/01/2026

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)	230,972	D
Ordinary Shares	07/01/2026		M		250	A	$0(1)	231,222	D
Ordinary Shares	07/01/2026		M		250	A	$0(1)	231,472	D
Ordinary Shares	07/01/2026		M		249	A	$0(1)	231,721	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

	/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 did Arqit Quantum (ARQQ) director Carlo Calabria report on this Form 4?

Carlo Calabria reported vesting and exercise of restricted share units into ordinary shares. These entries reflect compensation-related derivative exercises, not open-market buying or selling, and increase his direct ownership position in Arqit Quantum Inc. ordinary shares.

How many Arqit Quantum ordinary shares were acquired through RSU exercises?

The filing shows RSU exercises totaling 799 ordinary shares. These came from several restricted share unit awards that converted into Arqit Quantum Inc. ordinary shares on a one-for-one basis at an exercise price of 0.0000 per share.

What is Carlo Calabria’s Arqit Quantum shareholding after these transactions?

After the reported RSU exercises, Carlo Calabria directly owned 230,972 ordinary shares of Arqit Quantum Inc. This figure represents his post-transaction direct holdings as disclosed in the Form 4 transaction tables.

Were these Arqit Quantum transactions open-market purchases or sales?

No, the transactions are coded “M” for derivative exercises. They represent restricted share units converting into ordinary shares, with a transaction price of 0.0000 per share, rather than open-market buying or selling activity in Arqit Quantum stock.

How do the Arqit Quantum RSUs held by Carlo Calabria vest over time?

Footnotes state that RSUs vest quarterly in equal installments on dates including July 1 and October 1, 2026, and January 1, April 1, July 1, October 1, 2027, and similar quarterly dates extending into 2028.

What is the conversion ratio for Arqit Quantum restricted share units in this filing?

The footnotes explain that each restricted share unit converts into one Arqit Quantum ordinary share. This one-for-one conversion applies to the RSUs that vested and were exercised in the reported Form 4 transactions.