ARQQ: Ritchie Garth discloses securities transactions

By AlphaYouPublished Oct 6, 2026Form 4

Stocks in this disclosure

Reported activity

Ritchie Garth

Reporting filer

Ritchie Garth reported Exercise or conversion in Arqit Quantum Inc.: 17 units of Ordinary Shares, dated 2026-10-02. The full Form 4 contains 12 transaction entries.

Disclosed: Oct 6, 2026

Reported details

12 entries

All validated entries in this disclosure
Security	Owner	Date	Code	Action	Quantity	Price	Following holdings	Reporting delay	Filed terms and references
Ordinary Shares	Ritchie Garth	2026-10-02	M	Exercise or conversion	17	0	105,719	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: 105719 direct Or Indirect Ownership: D
Ordinary Shares	Ritchie Garth	2026-10-02	M	Exercise or conversion	67	0	105,786	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: 105786 direct Or Indirect Ownership: D
Ordinary Shares	Ritchie Garth	2026-10-02	M	Exercise or conversion	83	0	105,869	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: 105869 direct Or Indirect Ownership: D
Ordinary Shares	Ritchie Garth	2026-10-02	M	Exercise or conversion	83	0	105,952	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: 105952 direct Or Indirect Ownership: D
Ordinary Shares	Ritchie Garth	2026-10-02	S	Sale	32	24.4743	105,920	4 days	Filed terms security Title: Ordinary Shares transaction Date: 2026-10-02 transaction Form Type: 4 transaction Code: S equity Swap Involved: 0 transaction Timeliness: transaction Shares: 32 transaction Price Per Share: 24.4743 transaction Acquired Disposed Code: D shares Owned Following Transaction: 105920 direct Or Indirect Ownership: D
Ordinary Shares	Ritchie Garth	2026-10-02	S	Sale	9	24.4743	105,911	4 days	Filed terms security Title: Ordinary Shares transaction Date: 2026-10-02 transaction Form Type: 4 transaction Code: S equity Swap Involved: 0 transaction Timeliness: transaction Shares: 9 transaction Price Per Share: 24.4743 transaction Acquired Disposed Code: D shares Owned Following Transaction: 105911 direct Or Indirect Ownership: D
Ordinary Shares	Ritchie Garth	2026-10-02	S	Sale	40	24.4743	105,871	4 days	Filed terms security Title: Ordinary Shares transaction Date: 2026-10-02 transaction Form Type: 4 transaction Code: S equity Swap Involved: 0 transaction Timeliness: transaction Shares: 40 transaction Price Per Share: 24.4743 transaction Acquired Disposed Code: D shares Owned Following Transaction: 105871 direct Or Indirect Ownership: D
Ordinary Shares	Ritchie Garth	2026-10-02	S	Sale	40	24.4743	105,831	4 days	Filed terms security Title: Ordinary Shares transaction Date: 2026-10-02 transaction Form Type: 4 transaction Code: S equity Swap Involved: 0 transaction Timeliness: transaction Shares: 40 transaction Price Per Share: 24.4743 transaction Acquired Disposed Code: D shares Owned Following Transaction: 105831 direct Or Indirect Ownership: D
Restricted Share Units (derivative)	Ritchie Garth	2026-10-02	M	Exercise or conversion	17	Not stated (see footnotes)	899	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: 899 direct Or Indirect Ownership: D
Restricted Share Units (derivative)	Ritchie Garth	2026-10-02	M	Exercise or conversion	67	Not stated (see footnotes)	832	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: 832 direct Or Indirect Ownership: D
Restricted Share Units (derivative)	Ritchie Garth	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)	Ritchie Garth	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: Ritchie Garth
Date: 2026-10-02
Code: M
Action: Exercise or conversion
Quantity: 17
Price: 0
Following holdings: 105,719
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: 105719
direct Or Indirect Ownership: D

Ordinary Shares

Owner: Ritchie Garth
Date: 2026-10-02
Code: M
Action: Exercise or conversion
Quantity: 67
Price: 0
Following holdings: 105,786
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: 105786
direct Or Indirect Ownership: D

Ordinary Shares

Owner: Ritchie Garth
Date: 2026-10-02
Code: M
Action: Exercise or conversion
Quantity: 83
Price: 0
Following holdings: 105,869
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: 105869
direct Or Indirect Ownership: D

Ordinary Shares

Owner: Ritchie Garth
Date: 2026-10-02
Code: M
Action: Exercise or conversion
Quantity: 83
Price: 0
Following holdings: 105,952
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: 105952
direct Or Indirect Ownership: D

Ordinary Shares

Owner: Ritchie Garth
Date: 2026-10-02
Code: S
Action: Sale
Quantity: 32
Price: 24.4743
Following holdings: 105,920
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: S
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 32
transaction Price Per Share: 24.4743
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 105920
direct Or Indirect Ownership: D

Ordinary Shares

Owner: Ritchie Garth
Date: 2026-10-02
Code: S
Action: Sale
Quantity: 9
Price: 24.4743
Following holdings: 105,911
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: S
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 9
transaction Price Per Share: 24.4743
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 105911
direct Or Indirect Ownership: D

Ordinary Shares

Owner: Ritchie Garth
Date: 2026-10-02
Code: S
Action: Sale
Quantity: 40
Price: 24.4743
Following holdings: 105,871
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: S
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 40
transaction Price Per Share: 24.4743
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 105871
direct Or Indirect Ownership: D

Ordinary Shares

Owner: Ritchie Garth
Date: 2026-10-02
Code: S
Action: Sale
Quantity: 40
Price: 24.4743
Following holdings: 105,831
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: S
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 40
transaction Price Per Share: 24.4743
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 105831
direct Or Indirect Ownership: D

Restricted Share Units (derivative)

Owner: Ritchie Garth
Date: 2026-10-02
Code: M
Action: Exercise or conversion
Quantity: 17
Price: Not stated (see footnotes)
Following holdings: 899
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: 899
direct Or Indirect Ownership: D

Restricted Share Units (derivative)

Owner: Ritchie Garth
Date: 2026-10-02
Code: M
Action: Exercise or conversion
Quantity: 67
Price: Not stated (see footnotes)
Following holdings: 832
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: 832
direct Or Indirect Ownership: D

Restricted Share Units (derivative)

Owner: Ritchie Garth
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: Ritchie Garth
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.
Ritchie Garth: 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

Ritchie Garth

2026-10-02

Exercise or conversion

105,719

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: 105719
direct Or Indirect Ownership: D

Ordinary Shares

Ritchie Garth

2026-10-02

Exercise or conversion

105,786

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: 105786
direct Or Indirect Ownership: D

Ordinary Shares

Ritchie Garth

2026-10-02

Exercise or conversion

105,869

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: 105869
direct Or Indirect Ownership: D

Ordinary Shares

Ritchie Garth

2026-10-02

Exercise or conversion

105,952

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: 105952
direct Or Indirect Ownership: D

Ordinary Shares

Ritchie Garth

2026-10-02

Sale

24.4743

105,920

4 days

Filed terms

security Title: Ordinary Shares
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 32
transaction Price Per Share: 24.4743
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 105920
direct Or Indirect Ownership: D

Ordinary Shares

Ritchie Garth

2026-10-02

Sale

24.4743

105,911

4 days

Filed terms

security Title: Ordinary Shares
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 9
transaction Price Per Share: 24.4743
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 105911
direct Or Indirect Ownership: D

Ordinary Shares

Ritchie Garth

2026-10-02

Sale

24.4743

105,871

4 days

Filed terms

security Title: Ordinary Shares
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 40
transaction Price Per Share: 24.4743
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 105871
direct Or Indirect Ownership: D

Ordinary Shares

Ritchie Garth

2026-10-02

Sale

24.4743

105,831

4 days

Filed terms

security Title: Ordinary Shares
transaction Date: 2026-10-02
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 40
transaction Price Per Share: 24.4743
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 105831
direct Or Indirect Ownership: D

Restricted Share Units (derivative)

Ritchie Garth

2026-10-02

Exercise or conversion

Not stated (see footnotes)

899

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: 899
direct Or Indirect Ownership: D

Restricted Share Units (derivative)

Ritchie Garth

2026-10-02

Exercise or conversion

Not stated (see footnotes)

832

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: 832
direct Or Indirect Ownership: D

Restricted Share Units (derivative)

Ritchie Garth

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)

Ritchie Garth

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.

Ritchie Garth: 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.