Filing status
- Accounts due
- 31 December 2026
- Last accounts
- 31 December 2024
- Conf. stmt due
- 2 February 2027
- Last conf. stmt
- 19 January 2026
Yellowstone Biosciences Limited
- Incorporated
- 20 January 2023 (3 years)
- Industry
- Research and experimental development on biotechnology (72110)
- Directors
- James Jay Macdonald
- Owned by
- Syncona Limited
- Accounts type
- Small
- Region
- South East
- Address
- 4100 Chancellor CourtJohn Smith DriveArc OxfordOxfordOX4 2GX
Charges
- Total
- 1
- Outstanding
- 1
- Part satisfied
- 0
- Satisfied
- 0
Officers 5 active
Officer details are public data from the Companies House register.
Macdonald, James Jay
Director · Appointed 15 September 2025
American
Born May 1974 (52)
Hirst, Julian Clement
Secretary · Appointed 25 April 2024
Director · Appointed 28 March 2024
British,Chilean
Born March 1989 (37)
Director · Appointed 28 March 2024
British
Born December 1974 (51)
Director · Appointed 28 March 2024
British
Born December 1961 (64)
Officer history (3 former)
31 October 2025
15 September 2025
Appointed Macdonald, James Jay as Director
25 April 2024
Appointed Hirst, Julian Clement as Secretary
28 March 2024
28 March 2024
28 March 2024
28 March 2024
28 March 2024
Resigned Hirst, Julian Clement as Secretary
28 March 2024
Resigned Hirst, Julian Clement as Director
20 January 2023
Appointed Hirst, Julian Clement as Secretary
20 January 2023
Appointed Hirst, Julian Clement as Director
Ownership 1 active
People and entities with significant control, from the Companies House PSC register
Syncona Limited
Corporate entity · Notified 12 June 2024
Owns 50–75% of shares
Holds 50–75% of voting rights
Right to appoint and remove directors
Non-Cellular Company
Reg. no. 55514
Former controllers (3)
24 June 2024
28 March 2024
Ceased Julian Clement Hirst — Owns 75–100% of shares
30 January 2024
Ceased Giridharan Ramsingh — Owns 25–50% of shares
Financials
Figures from 2024 accounts. Newer accounts, made up to 31 December 2024, are filed but not read yet. See them on Companies House
- Net Assets
- £53
- Cash
- £35
Balance sheet detail
| 2024 | |
|---|---|
| Cash | £35 |
| Net Assets | £53 |
| Shareholder Funds | £53 |
Filings
Recent filings only. See the full history on Companies House
| Date | Description | Made Up To | Pages | |
|---|---|---|---|---|
| 29 January 2026 | Confirmation statement with no updates | 19 January 2026 | 3 | |
| 31 October 2025 | Termination of appointment of a director | 1 | ||
| 21 October 2025 | Appointment of a director | 2 | ||
| 7 October 2025 | Accounts for a small company | 31 December 2024 | 13 | |
| 2 May 2025 | Second filing of a statement of capital following an allotment of shares | 7 |
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