Changes in Beneficial Ownership · 4
Arqit Quantum Inc.
ARQQNASDAQEQUITYCurrent
Changes in Beneficial Ownership
Structured filing — 4
form4.xml
Filing details
- Report period
- 2026-10-15
- Issuer
- Arqit Quantum Inc.
- Issuer CIK
- 0001859690
- Trading symbol
- ARQQ
Reporting owner 1
- Name
- Ritchie Garth
- Reporting owner CIK
- 0001840684
- Relationship
- Director
- Address
- 3 ORCHARD PLACE, LONDON, UNITED KINGDOM, X0, SW1H 0BF
Non-derivative transactions
| Security | Transaction date | Code | Amount | A / D | Price (USD) | Owned after | Ownership |
|---|---|---|---|---|---|---|---|
| Ordinary Shares | 2026-10-16 | M · Form 4 | 1,021 | A | 0[F1] | 106,855 | D |
Table key
- M · Form 4
- Exempt derivative exercise or conversion under Rule 16b-3
- A
- Acquired
- D
- Direct
Derivative transactions
| Security | Conversion / exercise price (USD) | Transaction date | Code | Amount | A / D | Price (USD) | Exercisable | Expires | Underlying security | Underlying shares | Owned after | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Restricted Share Units | [F1] | 2026-10-15 | A · Form 4 | 1,021 | A | 0 | [F1] | [F1] | Ordinary Shares | 1,021 | 1,021 | D |
| Restricted Share Units | [F1] | 2026-10-16 | M · Form 4 | 1,021 | D | 0 | [F1] | [F1] | Ordinary Shares | 1,021 | 0 | D |
Table key
- A · Form 4
- Acquisition by grant, award or otherwise under Rule 16b-3(d)
- A
- Acquired
- D
- Direct
- M · Form 4
- Exempt derivative exercise or conversion under Rule 16b-3
Footnotes
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. Ex.24 - Power of Attorney
Signature 1
- Signed
- /s/ Noleen McDonnell, as Attorney-in-Fact
- Date
- 2026-10-20
Filed exhibits
Company context
Arqit Quantum Inc. (Nasdaq: ARQQ) secures the world’s most critical data with quantum-safe encryption software. Simple, scalable, and compliant, its products integrate with existing infrastructure, and requires no rip and replace of hardware. Arqit provides a complete “Detect, Protect, Comply” solution for governments and enterprises that detects and inventories cryptographic assets, protects data, ensures compliance, and safeguards transition to the post-quantum era.