Arqit Quantum director converts awards into 248 shares

Q: How many ARQQ ordinary shares did director Carlo Calabria acquire?

Carlo Calabria acquired 248 ordinary shares in the reported transactions on October 5, 2026. The report lists RSU positions of 16, 66, 83 and 83 units converted into corresponding ordinary shares.

The RSU awards include quarterly vesting schedules, with the longest schedule ending October 1, 2028.

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Rhea-AI Filing Summary

Arqit Quantum Inc. (ARQQ) director Carlo Calabria reported four restricted share unit (RSU) conversions on October 5, 2026: RSU positions of 16, 66, 83 and 83 units were disposed of as corresponding ordinary shares were acquired. The RSUs convert into ordinary shares on a one-for-one basis, and the transactions list 248 ordinary shares acquired.

The awards vest in equal quarterly installments on schedules beginning October 1, 2026; the longest schedule runs through October 1, 2028.

Insider Trade Summary

248 shares exercised/converted

Exercise 8 txns

Insider Calabria Carlo

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Share Units ^F2	16	$0.00	$0.00
Exercise	Restricted Share Units ^F2	66	$0.00	$0.00
Exercise	Restricted Share Units ^F3	83	$0.00	$0.00
Exercise	Restricted Share Units ^F4	83	$0.00	$0.00
Exercise	Ordinary Shares ^F1	16	$0.00	$0.00
Exercise	Ordinary Shares ^F1	66	$0.00	$0.00
Exercise	Ordinary Shares ^F1	83	$0.00	$0.00
Exercise	Ordinary Shares ^F1	83	$0.00	$0.00

Holdings After Transaction: Restricted Share Units — 3,751 contracts (Direct); Ordinary Shares — 233,228 shares (Direct)

Footnotes (4)

F1. The Restricted Share Units ("RSUs") convert into ARQQ ordinary shares on a one-for-one basis.
F2. The RSUs vest quarterly in equal installments on October 1, 2026, and January 1, April 1, and July 1, 2027.
F3. The RSUs vest quarterly in equal installments on October 1, 2026, and January 1, April 1, July 1, and October 1, 2027.
F4. The RSUs vest quarterly in equal installments on 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

RSUs disposed: 16 units RSUs disposed: 66 units RSUs disposed: 83 units +2 more

5 metrics

RSUs disposed 16 units Reported October 5, 2026

RSUs disposed 66 units Reported October 5, 2026

RSUs disposed 83 units One award reported October 5, 2026; vesting schedule runs through October 1, 2027

RSUs disposed 83 units One award reported October 5, 2026; vesting schedule runs through October 1, 2028

Ordinary shares acquired 248 shares Reported across the transactions on October 5, 2026

Key Terms

Restricted Share Units, one-for-one basis, vest quarterly in equal installments

3 terms

one-for-one basis financial

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

vest quarterly in equal installments financial

"The RSUs vest quarterly in equal installments"

FAQ

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

How many ARQQ ordinary shares did director Carlo Calabria acquire?

Carlo Calabria acquired 248 ordinary shares in the reported transactions on October 5, 2026. The report lists RSU positions of 16, 66, 83 and 83 units converted into corresponding ordinary shares.

When do Carlo Calabria’s ARQQ RSUs vest?

The 16-unit and 66-unit awards vest in equal quarterly installments on October 1, 2026, and January 1, April 1 and July 1, 2027. One 83-unit award schedule runs through October 1, 2027; the other runs through October 1, 2028.

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

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Available on EDGAR 10/07/2026 - 07:51 PM Accepted by SEC EDGAR 10/07/2026 - 07:51 PM

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)
10/05/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Ordinary Shares	10/05/2026		M		16	A	$0⁽¹⁾	232,996	D
Ordinary Shares	10/05/2026		M		66	A	$0⁽¹⁾	233,062	D
Ordinary Shares	10/05/2026		M		83	A	$0⁽¹⁾	233,145	D
Ordinary Shares	10/05/2026		M		83	A	$0⁽¹⁾	233,228	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Share Units	⁽²⁾	10/05/2026		M			16	⁽²⁾	⁽²⁾	Ordinary Shares	16	$0	816	D
Restricted Share Units	⁽²⁾	10/05/2026		M			66	⁽²⁾	⁽²⁾	Ordinary Shares	66	$0	750	D
Restricted Share Units	⁽³⁾	10/05/2026		M			83	⁽³⁾	⁽³⁾	Ordinary Shares	83	$0	1,001	D
Restricted Share Units	⁽⁴⁾	10/05/2026		M			83	⁽⁴⁾	⁽⁴⁾	Ordinary Shares	83	$0	2,000	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 October 1, 2026, and January 1, April 1, and July 1, 2027.

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

4. The RSUs vest quarterly in equal installments on 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.

	/s/ Noleen McDonnell, as Attorney-in-Fact	10/07/2026
	** 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)

Source: View Original Filing on SEC EDGAR