Key facts
- This page summarizes Garth Ritchie's Form 4 filing for Arqit Quantum Inc. (ARQQ).
- 9 reported transactions and 4 derivative rows are listed below.
- Accepted by SEC: 07 Oct 2026, 19:44.
Garth Ritchie - 05 Oct 2026 Form 4 Insider Report for Arqit Quantum Inc. (ARQQ)
- Reporting relationship
- Director
- Issuer ticker
- ARQQ
- Reported as of
- 05 Oct 2026
- Net transaction value
- -$3,021
- SEC form
- 4
- Accepted by SEC
- 07 Oct 2026, 19:44:01 UTC
- Prior SEC filing
- 06 Oct 2026
- Next SEC filing
- 08 Oct 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Noleen McDonnell, as Attorney-in-Fact
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Garth Ritchie filed Form 4 for Arqit Quantum Inc. (ARQQ) on 07 Oct 2026.
Change
- Previous filing in this sequence was filed on 06 Oct 2026.
- Current net transaction value: -$3,021.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001840684
Primary reporting owner
Ritchie Garth
- Relationship
- Director
- Address
- 3 ORCHARD PLACE, LONDON, UNITED KINGDOM
- Signature
- /s/ Noleen McDonnell, as Attorney-in-Fact
- Signature date
- 07 Oct 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
ARQQ
transaction
Ordinary Shares
Options Exercise
- Transaction value
- Shares
- +16
- Change %
- +0.02%
- Price
- $0.000000*
- Shares after
- 105,847
- Date
- 05 Oct 2026
- Ownership
- Direct
- Footnotes
- F1
ARQQ
transaction
Ordinary Shares
Options Exercise
- Transaction value
- Shares
- +66
- Change %
- +0.06%
- Price
- $0.000000*
- Shares after
- 105,913
- Date
- 05 Oct 2026
- Ownership
- Direct
- Footnotes
- F1
ARQQ
transaction
Ordinary Shares
Options Exercise
- Transaction value
- Shares
- +83
- Change %
- +0.08%
- Price
- $0.000000*
- Shares after
- 105,996
- Date
- 05 Oct 2026
- Ownership
- Direct
- Footnotes
- F1
ARQQ
transaction
Ordinary Shares
Options Exercise
- Transaction value
- Shares
- +83
- Change %
- +0.08%
- Price
- $0.000000*
- Shares after
- 106,079
- Date
- 05 Oct 2026
- Ownership
- Direct
- Footnotes
- F1
ARQQ
transaction
Ordinary Shares
Sale
- Transaction value
- $3,021
- Shares
- -127
- Change %
- -0.12%
- Price
- $23.78
- Shares after
- 105,952
- Date
- 05 Oct 2026
- Ownership
- Direct
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
ARQQ
transaction
Derivative
Restricted Share Units
Options Exercise
- Transaction value
- Shares
- -16
- Change %
- -1.9%
- Price
- $0.000000*
- Shares after
- 816
- Date
- 05 Oct 2026
- Ownership
- Direct
- Underlying class
- Ordinary Shares
- Underlying amount
- 16
- Exercise price
- Footnotes
- F2
ARQQ
transaction
Derivative
Restricted Share Units
Options Exercise
- Transaction value
- Shares
- -66
- Change %
- -8.1%
- Price
- $0.000000*
- Shares after
- 750
- Date
- 05 Oct 2026
- Ownership
- Direct
- Underlying class
- Ordinary Shares
- Underlying amount
- 66
- Exercise price
- Footnotes
- F2
ARQQ
transaction
Derivative
Restricted Share Units
Options Exercise
- Transaction value
- Shares
- -83
- Change %
- -7.7%
- Price
- $0.000000*
- Shares after
- 1,001
- Date
- 05 Oct 2026
- Ownership
- Direct
- Underlying class
- Ordinary Shares
- Underlying amount
- 83
- Exercise price
- Footnotes
- F3
ARQQ
transaction
Derivative
Restricted Share Units
Options Exercise
- Transaction value
- Shares
- -83
- Change %
- -4%
- Price
- $0.000000*
- Shares after
- 2,000
- Date
- 05 Oct 2026
- Ownership
- Direct
- Underlying class
- Ordinary Shares
- Underlying amount
- 83
- Exercise price
- Footnotes
- F4
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 4 footnotes
Footnote F1
The Restricted Share Units ("RSUs") convert into ARQQ ordinary shares on a one-for-one basis.
Footnote F2
The RSUs vest quarterly in equal installments on October 1, 2026, and January 1, April 1, and July 1, 2027.
Footnote F3
The RSUs vest quarterly in equal installments on October 1, 2026, and January 1, April 1, July 1, and October 1, 2027.
Footnote 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.
SEC 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.