ARQQ: Lefebvre d'Ovidio Manfredi discloses securities transactions

By AlphaYouPublished Oct 6, 2026Form 4

Stocks in this disclosure

Reported activity

Lefebvre d'Ovidio Manfredi

Reporting filer

Lefebvre d'Ovidio Manfredi reported Exercise or conversion in Arqit Quantum Inc.: 1111 units of Ordinary Shares, dated 2026-10-02. The full Form 4 contains 10 transaction entries.

Disclosed: Oct 6, 2026

Reported details

10 entries

All validated entries in this disclosure
Security	Owner	Date	Code	Action	Quantity	Price	Following holdings	Reporting delay	Filed terms and references
Ordinary Shares	Lefebvre d'Ovidio Manfredi	2026-10-02	M	Exercise or conversion	1111	0	51,498	4 days	Filed terms security Title: Ordinary Shares transaction Date: 2026-10-02 transaction Form Type: 4 transaction Code: M equity Swap Involved: 0 transaction Timeliness: transaction Shares: 1111 transaction Price Per Share: 0 id: F1 transaction Acquired Disposed Code: A shares Owned Following Transaction: 51498 direct Or Indirect Ownership: D
Ordinary Shares	Lefebvre d'Ovidio Manfredi	2026-10-02	M	Exercise or conversion	83	0	51,581	4 days	Filed terms security Title: Ordinary Shares transaction Date: 2026-10-02 transaction Form Type: 4 transaction Code: M equity Swap Involved: 0 transaction Timeliness: transaction Shares: 83 transaction Price Per Share: 0 id: F1 transaction Acquired Disposed Code: A shares Owned Following Transaction: 51581 direct Or Indirect Ownership: D
Ordinary Shares	Lefebvre d'Ovidio Manfredi	2026-10-02	M	Exercise or conversion	17	0	51,598	4 days	Filed terms security Title: Ordinary Shares transaction Date: 2026-10-02 transaction Form Type: 4 transaction Code: M equity Swap Involved: 0 transaction Timeliness: transaction Shares: 17 transaction Price Per Share: 0 id: F1 transaction Acquired Disposed Code: A shares Owned Following Transaction: 51598 direct Or Indirect Ownership: D
Ordinary Shares	Lefebvre d'Ovidio Manfredi	2026-10-02	M	Exercise or conversion	67	0	51,665	4 days	Filed terms security Title: Ordinary Shares transaction Date: 2026-10-02 transaction Form Type: 4 transaction Code: M equity Swap Involved: 0 transaction Timeliness: transaction Shares: 67 transaction Price Per Share: 0 id: F1 transaction Acquired Disposed Code: A shares Owned Following Transaction: 51665 direct Or Indirect Ownership: D
Ordinary Shares	Lefebvre d'Ovidio Manfredi	2026-10-02	M	Exercise or conversion	83	0	51,748	4 days	Filed terms security Title: Ordinary Shares transaction Date: 2026-10-02 transaction Form Type: 4 transaction Code: M equity Swap Involved: 0 transaction Timeliness: transaction Shares: 83 transaction Price Per Share: 0 id: F1 transaction Acquired Disposed Code: A shares Owned Following Transaction: 51748 direct Or Indirect Ownership: D
Restricted Share Units (derivative)	Lefebvre d'Ovidio Manfredi	2026-10-02	M	Exercise or conversion	1111	Not stated (see footnotes)	12,021	4 days	Filed terms security Title: Restricted Share Units id: F2 transaction Date: 2026-10-02 transaction Form Type: 4 transaction Code: M equity Swap Involved: 0 transaction Timeliness: transaction Shares: 1111 id: F1 transaction Acquired Disposed Code: D id: F2 id: F2 underlying Security Title: Ordinary Shares underlying Security Shares: 1111 shares Owned Following Transaction: 12021 direct Or Indirect Ownership: D
Restricted Share Units (derivative)	Lefebvre d'Ovidio Manfredi	2026-10-02	M	Exercise or conversion	83	Not stated (see footnotes)	1,084	4 days	Filed terms security Title: Restricted Share Units id: F3 transaction Date: 2026-10-02 transaction Form Type: 4 transaction Code: M equity Swap Involved: 0 transaction Timeliness: transaction Shares: 83 id: F1 transaction Acquired Disposed Code: D id: F3 id: F3 underlying Security Title: Ordinary Shares underlying Security Shares: 83 shares Owned Following Transaction: 1084 direct Or Indirect Ownership: D
Restricted Share Units (derivative)	Lefebvre d'Ovidio Manfredi	2026-10-02	M	Exercise or conversion	17	Not stated (see footnotes)	12,004	4 days	Filed terms security Title: Restricted Share Units id: F2 transaction Date: 2026-10-02 transaction Form Type: 4 transaction Code: M equity Swap Involved: 0 transaction Timeliness: transaction Shares: 17 id: F1 transaction Acquired Disposed Code: D id: F2 id: F2 underlying Security Title: Ordinary Shares underlying Security Shares: 17 shares Owned Following Transaction: 12004 direct Or Indirect Ownership: D
Restricted Share Units (derivative)	Lefebvre d'Ovidio Manfredi	2026-10-02	M	Exercise or conversion	67	Not stated (see footnotes)	11,937	4 days	Filed terms security Title: Restricted Share Units id: F2 transaction Date: 2026-10-02 transaction Form Type: 4 transaction Code: M equity Swap Involved: 0 transaction Timeliness: transaction Shares: 67 id: F1 transaction Acquired Disposed Code: D id: F2 id: F2 underlying Security Title: Ordinary Shares underlying Security Shares: 67 shares Owned Following Transaction: 11937 direct Or Indirect Ownership: D
Restricted Share Units (derivative)	Lefebvre d'Ovidio Manfredi	2026-10-02	M	Exercise or conversion	83	Not stated (see footnotes)	2,083	4 days	Filed terms security Title: Restricted Share Units id: F4 transaction Date: 2026-10-02 transaction Form Type: 4 transaction Code: M equity Swap Involved: 0 transaction Timeliness: transaction Shares: 83 id: F1 transaction Acquired Disposed Code: D id: F4 id: F4 underlying Security Title: Ordinary Shares underlying Security Shares: 83 shares Owned Following Transaction: 2083 direct Or Indirect Ownership: D

Ordinary Shares

Owner: Lefebvre d'Ovidio Manfredi
Date: 2026-10-02
Code: M
Action: Exercise or conversion
Quantity: 1111
Price: 0
Following holdings: 51,498
Reporting delay: 4 days
Filed terms and references: Filed terms
security Title: Ordinary Shares
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 1111
transaction Price Per Share: 0
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 51498
direct Or Indirect Ownership: D

Ordinary Shares

Owner: Lefebvre d'Ovidio Manfredi
Date: 2026-10-02
Code: M
Action: Exercise or conversion
Quantity: 83
Price: 0
Following holdings: 51,581
Reporting delay: 4 days
Filed terms and references: Filed terms
security Title: Ordinary Shares
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 83
transaction Price Per Share: 0
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 51581
direct Or Indirect Ownership: D

Ordinary Shares

Owner: Lefebvre d'Ovidio Manfredi
Date: 2026-10-02
Code: M
Action: Exercise or conversion
Quantity: 17
Price: 0
Following holdings: 51,598
Reporting delay: 4 days
Filed terms and references: Filed terms
security Title: Ordinary Shares
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 17
transaction Price Per Share: 0
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 51598
direct Or Indirect Ownership: D

Ordinary Shares

Owner: Lefebvre d'Ovidio Manfredi
Date: 2026-10-02
Code: M
Action: Exercise or conversion
Quantity: 67
Price: 0
Following holdings: 51,665
Reporting delay: 4 days
Filed terms and references: Filed terms
security Title: Ordinary Shares
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 67
transaction Price Per Share: 0
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 51665
direct Or Indirect Ownership: D

Ordinary Shares

Owner: Lefebvre d'Ovidio Manfredi
Date: 2026-10-02
Code: M
Action: Exercise or conversion
Quantity: 83
Price: 0
Following holdings: 51,748
Reporting delay: 4 days
Filed terms and references: Filed terms
security Title: Ordinary Shares
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 83
transaction Price Per Share: 0
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 51748
direct Or Indirect Ownership: D

Restricted Share Units (derivative)

Owner: Lefebvre d'Ovidio Manfredi
Date: 2026-10-02
Code: M
Action: Exercise or conversion
Quantity: 1111
Price: Not stated (see footnotes)
Following holdings: 12,021
Reporting delay: 4 days
Filed terms and references: Filed terms
security Title: Restricted Share Units
id: F2
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 1111
id: F1
transaction Acquired Disposed Code: D
id: F2
id: F2
underlying Security Title: Ordinary Shares
underlying Security Shares: 1111
shares Owned Following Transaction: 12021
direct Or Indirect Ownership: D

Restricted Share Units (derivative)

Owner: Lefebvre d'Ovidio Manfredi
Date: 2026-10-02
Code: M
Action: Exercise or conversion
Quantity: 83
Price: Not stated (see footnotes)
Following holdings: 1,084
Reporting delay: 4 days
Filed terms and references: Filed terms
security Title: Restricted Share Units
id: F3
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 83
id: F1
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Ordinary Shares
underlying Security Shares: 83
shares Owned Following Transaction: 1084
direct Or Indirect Ownership: D

Restricted Share Units (derivative)

Owner: Lefebvre d'Ovidio Manfredi
Date: 2026-10-02
Code: M
Action: Exercise or conversion
Quantity: 17
Price: Not stated (see footnotes)
Following holdings: 12,004
Reporting delay: 4 days
Filed terms and references: Filed terms
security Title: Restricted Share Units
id: F2
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 17
id: F1
transaction Acquired Disposed Code: D
id: F2
id: F2
underlying Security Title: Ordinary Shares
underlying Security Shares: 17
shares Owned Following Transaction: 12004
direct Or Indirect Ownership: D

Restricted Share Units (derivative)

Owner: Lefebvre d'Ovidio Manfredi
Date: 2026-10-02
Code: M
Action: Exercise or conversion
Quantity: 67
Price: Not stated (see footnotes)
Following holdings: 11,937
Reporting delay: 4 days
Filed terms and references: Filed terms
security Title: Restricted Share Units
id: F2
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 67
id: F1
transaction Acquired Disposed Code: D
id: F2
id: F2
underlying Security Title: Ordinary Shares
underlying Security Shares: 67
shares Owned Following Transaction: 11937
direct Or Indirect Ownership: D

Restricted Share Units (derivative)

Owner: Lefebvre d'Ovidio Manfredi
Date: 2026-10-02
Code: M
Action: Exercise or conversion
Quantity: 83
Price: Not stated (see footnotes)
Following holdings: 2,083
Reporting delay: 4 days
Filed terms and references: Filed terms
security Title: Restricted Share Units
id: F4
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 83
id: F1
transaction Acquired Disposed Code: D
id: F4
id: F4
underlying Security Title: Ordinary Shares
underlying Security Shares: 83
shares Owned Following Transaction: 2083
direct Or Indirect Ownership: D

Purchases, sales, grants and option exercises are different transactions. The reported code identifies the action; it does not establish a motive.

Filing context

Quantities and prices are shown in the units filed. No trade value is inferred from their product.
Lefebvre d'Ovidio Manfredi: Director.
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.

Original sources

SEC ownership filing

Prepared automatically from public filing data. Report a correction.

Security

Owner

Date

Code

Action

Quantity

Price

Following holdings

Reporting delay

Filed terms and references

Ordinary Shares

Lefebvre d'Ovidio Manfredi

2026-10-02

Exercise or conversion

1111

51,498

4 days

Filed terms

security Title: Ordinary Shares
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 1111
transaction Price Per Share: 0
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 51498
direct Or Indirect Ownership: D

Ordinary Shares

Lefebvre d'Ovidio Manfredi

2026-10-02

Exercise or conversion

51,581

4 days

Filed terms

security Title: Ordinary Shares
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 83
transaction Price Per Share: 0
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 51581
direct Or Indirect Ownership: D

Ordinary Shares

Lefebvre d'Ovidio Manfredi

2026-10-02

Exercise or conversion

51,598

4 days

Filed terms

security Title: Ordinary Shares
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 17
transaction Price Per Share: 0
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 51598
direct Or Indirect Ownership: D

Ordinary Shares

Lefebvre d'Ovidio Manfredi

2026-10-02

Exercise or conversion

51,665

4 days

Filed terms

security Title: Ordinary Shares
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 67
transaction Price Per Share: 0
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 51665
direct Or Indirect Ownership: D

Ordinary Shares

Lefebvre d'Ovidio Manfredi

2026-10-02

Exercise or conversion

51,748

4 days

Filed terms

security Title: Ordinary Shares
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 83
transaction Price Per Share: 0
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 51748
direct Or Indirect Ownership: D

Restricted Share Units (derivative)

Lefebvre d'Ovidio Manfredi

2026-10-02

Exercise or conversion

1111

Not stated (see footnotes)

12,021

4 days

Filed terms

security Title: Restricted Share Units
id: F2
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 1111
id: F1
transaction Acquired Disposed Code: D
id: F2
id: F2
underlying Security Title: Ordinary Shares
underlying Security Shares: 1111
shares Owned Following Transaction: 12021
direct Or Indirect Ownership: D

Restricted Share Units (derivative)

Lefebvre d'Ovidio Manfredi

2026-10-02

Exercise or conversion

Not stated (see footnotes)

1,084

4 days

Filed terms

security Title: Restricted Share Units
id: F3
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 83
id: F1
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Ordinary Shares
underlying Security Shares: 83
shares Owned Following Transaction: 1084
direct Or Indirect Ownership: D

Restricted Share Units (derivative)

Lefebvre d'Ovidio Manfredi

2026-10-02

Exercise or conversion

Not stated (see footnotes)

12,004

4 days

Filed terms

security Title: Restricted Share Units
id: F2
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 17
id: F1
transaction Acquired Disposed Code: D
id: F2
id: F2
underlying Security Title: Ordinary Shares
underlying Security Shares: 17
shares Owned Following Transaction: 12004
direct Or Indirect Ownership: D

Restricted Share Units (derivative)

Lefebvre d'Ovidio Manfredi

2026-10-02

Exercise or conversion

Not stated (see footnotes)

11,937

4 days

Filed terms

security Title: Restricted Share Units
id: F2
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 67
id: F1
transaction Acquired Disposed Code: D
id: F2
id: F2
underlying Security Title: Ordinary Shares
underlying Security Shares: 67
shares Owned Following Transaction: 11937
direct Or Indirect Ownership: D

Restricted Share Units (derivative)

Lefebvre d'Ovidio Manfredi

2026-10-02

Exercise or conversion

Not stated (see footnotes)

2,083

4 days

Filed terms

security Title: Restricted Share Units
id: F4
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: M
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 83
id: F1
transaction Acquired Disposed Code: D
id: F4
id: F4
underlying Security Title: Ordinary Shares
underlying Security Shares: 83
shares Owned Following Transaction: 2083
direct Or Indirect Ownership: D

Filing context

Quantities and prices are shown in the units filed. No trade value is inferred from their product.

Lefebvre d'Ovidio Manfredi: Director.

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.