Garth Ritchie - 07 May 2026 Form 4 Insider Report for Arqit Quantum Inc. (ARQQ)

Reporting relationship: Director
Issuer ticker: ARQQ
Reported as of: 07 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 08 May 2026, 17:37:01 UTC
Prior SEC filing: 03 Apr 2026
Next SEC filing: 05 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Noleen McDonnell, as Attorney-in-Fact

Key filing fact

Garth Ritchie filed Form 4 for Arqit Quantum Inc. (ARQQ) on 08 May 2026.

Key facts

This page summarizes Garth Ritchie's Form 4 filing for Arqit Quantum Inc. (ARQQ).
3 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 08 May 2026, 17:37.

Change

Previous filing in this sequence was filed on 03 Apr 2026.
Current net transaction value: $0.

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

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

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: 08 May 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: +1,887
Change %: +6.6%
Price: $0.000000^*
Shares after: 30,687
Date: 07 May 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

ARQQ transaction Derivative

Restricted Stock Units

Award

Transaction value
Shares: +1,887
Change %
Price: $0.000000^*
Shares after: 1,887
Date: 07 May 2026
Ownership: Direct
Underlying class: Ordinary Shares
Underlying amount: 1,887
Exercise price
Footnotes: F1

ARQQ transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -1,887
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 07 May 2026
Ownership: Direct
Underlying class: Ordinary Shares
Underlying amount: 1,887
Exercise price
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

Restricted Stock Units ("RSUs") convert into ARQQ ordinary shares on a one-for-one bases. The RSUs vest immediately on the date of grant.

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.