Northern Gritstone Limited

Active12982592 Private limited company

Incorporated: 29 October 2020 (6 years)
Industry: Activities of venture and development capital companies (64303)
Directors: Anthony John Holden
Paddy Dowdall
Susan Elaine Hartley
all 10 directors
Accounts type: Group
Region: North West
Address: No.1 Circle Square
3 Symphony Park
Manchester
M1 7FS

Website & contact details

Website: northern-gritstone.com

Filing status

Accounts due: 31 December 2027
Last accounts: 31 March 2026
Conf. stmt due: 26 October 2027
Last conf. stmt: 12 October 2026

Officers 11 active

Officer details are public data from the Companies House register.

Holden, Anthony John, Professor

Director · Appointed 24 February 2026

Also at MSP Nominee 1 Limited, MSP Nominee 2 Limited, Manchester Science Partnerships Limited · more companies

British

Born August 1980 (46)

Dowdall, Paddy

Director · Appointed 1 April 2025

British

Born April 1975 (51)

Blackburn, Claire Helen

Secretary · Appointed 22 November 2023

Hartley, Susan Elaine

Director · Appointed 24 November 2022

British

Born July 1962 (64)

Sirdeshpande, Niranjan Srihari

Director · Appointed 19 May 2022

Also at Pragmatic Semiconductor Limited, Maslow V Limited · more companies

British

Born September 1980 (46)

Hadley, James Marshall

Director · Appointed 6 May 2022

British

Born December 1983 (42)

Johnson, Duncan Edward

Director · Appointed 9 September 2021

British

Born May 1970 (56)

Macpherson, Alexander Ian

Director · Appointed 9 September 2021

British

Born November 1964

Madeley, Jane Elisabeth

Director · Appointed 9 September 2021

Also at University of Leeds IP Limited · more companies

British

Born November 1967

O'Neill, Terence James, Lord

Director · Appointed 9 September 2021

Also at Shine: Support and Help in Education

British

Born March 1957 (69)

Graham, Andrew Mcculloch

Director · Appointed 23 December 2020

Also at Ifast Global Bank Limited · more companies

British

Born February 1964 (62)

Officer history (5 former)

24 February 2026

Resigned Georghiou, Gregory Loukas, Professor as Director

24 February 2026

Appointed Holden, Anthony John, Professor as Director

1 April 2025

Appointed Dowdall, Paddy as Director

22 November 2023

Appointed Blackburn, Claire Helen as Secretary

19 October 2023

Resigned Indigo Corporate Secretary Limited as Corporate Secretary

24 November 2022

Appointed Hartley, Susan Elaine as Director

1 September 2022

Resigned Petley, David Neil, Professor as Director

19 May 2022

Appointed Sirdeshpande, Niranjan Srihari as Director

6 May 2022

Appointed Hadley, James Marshall as Director

9 September 2021

Appointed Georghiou, Gregory Loukas, Professor as Director

9 September 2021

Appointed Petley, David Neil, Professor as Director

9 September 2021

Appointed O'Neill, Terence James, Lord as Director

9 September 2021

Appointed Indigo Corporate Secretary Limited as Corporate Secretary

9 September 2021

Appointed Madeley, Jane Elisabeth as Director

9 September 2021

Appointed Macpherson, Alexander Ian as Director

9 September 2021

Appointed Johnson, Duncan Edward as Director

9 September 2021

Resigned Pinsent Masons Secretarial Limited as Corporate Secretary

23 December 2020

Appointed Graham, Andrew Mcculloch as Director

23 December 2020

Resigned Booker, Russell Stuart as Director

29 October 2020

Appointed Booker, Russell Stuart as Director

29 October 2020

Appointed Pinsent Masons Secretarial Limited as Corporate Secretary

Ownership 0 active

People and entities with significant control, from the Companies House PSC register

The company has declared that it has no person with significant control.

Other holdings 3

Companies where Northern Gritstone Limited is registered as a person with significant control

Pixel-Flo Limited

Owns 25–50% of shares

Active

Silverray Ltd

Owns 25–50% of shares

Active

Silvia Bio Limited

Owns 25–50% of shares

Active

Former controllers (3)

14 March 2023

Ceased M&G FA Limited — Holds 25–50% of voting rights

19 May 2022

Ceased Duncan Edward Johnson — Owns 75–100% of shares

16 May 2022

Ceased Pinsent Masons Director Limited — Owns 75–100% of shares

Group structure 17 shown

Ownership group derived from the Companies House PSC register

Northern Gritstone Limited This company

Adsilico Limited Owns 25–50% of shares

Amplisi Limited Owns 25–50% of shares

Auxetec Limited Owns 25–50% of shares

Cavero Quantum Limited Owns 25–50% of shares

Cavero Secure Limited Owns 75–100% of shares

Crucible Therapeutics Limited Owns 25–50% of shares

Cytotrait Limited Owns 25–50% of shares

Exciting Instruments Limited Owns 25–50% of shares

Floreon Technology Limited Owns 25–50% of shares

Ivfmicro Limited Owns 25–50% of shares

Mimetrik Solutions Limited Owns 25–50% of shares

Northern Gritstone Innovation Services Limited Owns 75–100% of shares

Northern Gritstone Investment Manager Limited Owns 75–100% of shares

Olo Robotics Ltd Owns 25–50% of shares

Optalysys Ltd Holds 25–50% of voting rights

Phovir Technologies Limited Owns 25–50% of shares

And 3 more

Filings 84

Date	Description	Made Up To
5 November 2026	Confirmation statement with updates	12 October 2026
22 July 2026	Group of companies' accounts	31 March 2026
20 May 2026	Change of share class name or designation
18 April 2026	Memorandum and Articles of Association
18 April 2026	Resolutions