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Thirtyfivebio Limited

13157735

active
ltd
england wales
Companies House
Health Score
70 / 100

Some Concerns

30/30
Filing
0/30
Financial
40/40
Risk
  • Negative net worth (-10)
  • Current liabilities exceed current assets (-10)

Details

99 Park Drive, Milton, Abingdon, OX14 4RY
Incorporated 26/01/2021

Compliance

Last accounts

31/12/2025

total exemption full

Next accounts due

30/09/2027

On track

Confirmation statement

Last: 25/01/2026

Due 08/02/2027

On track

Industry

72110
Research and experimental development on biotechnology

Officers

Dr Thomas David Mccarthy

director · Since 26/01/2021

CHAIR PERSON

AUSTRALIAN · ENGLAND · Age 59

Also on 5 other boards

Brenton Karl Ahrens

director · Since 13/04/2021

VENTURE CAPITAL INVESTOR

AMERICAN · UNITED STATES · Age 63

Dr Nils Lonberg

director · Since 28/05/2021

EIR

AMERICAN · UNITED STATES · Age 70

Mr James Westcott

director · Since 29/06/2021

CEO

BRITISH · ENGLAND · Age 51

Ms Samantha Ann Harris

secretary · Since 22/06/2022

Dr Donmienne Doen Mun Leung

director · Since 11/03/2025

DIRECTOR

AMERICAN,AUSTRALIAN · ENGLAND · Age 53

Thomas David Mccarthy

director · Since 26/01/2021

Australian · England · Age 59

Brenton Karl Ahrens

director · Since 13/04/2021

American · United States · Age 63

Nils Lonberg

director · Since 28/05/2021

American · United States · Age 70

James Westcott

director · Since 29/06/2021

British · England · Age 51

Samantha Ann Harris

secretary · Since 22/06/2022

Donmienne Doen Mun Leung

director · Since 11/03/2025

American,Australian · England · Age 53

Former

Stuart Wynn Hughes

director · Resigned 13/04/2021

Peter Joyce

director · Resigned 13/04/2021

Kirsty Ann Mccarthy

director · Resigned 13/04/2021

Change History

statusactive
2026-08-17

Active

typeltd
2026-08-17

Private Limited Company

address line199 Park Drive
2026-08-17

99 PARK DRIVE

post townAbingdon
2026-08-17

ABINGDON

officer appointedHARRIS, Samantha Ann
2026-08-17
officer appointedAHRENS, Brenton Karl
2026-08-17
officer appointedLEUNG, Donmienne Doen Mun, Dr
2026-08-17
officer appointedLONBERG, Nils, Dr
2026-08-17
officer appointedMCCARTHY, Thomas David, Dr
2026-08-17
officer appointedWESTCOTT, James
2026-08-17

CompanyRankvs 2545+ SIC 72110 peers
37

Financial strength2th percentile among SIC peers · 1/25
Employees85th percentile among SIC peers · 13/15
LiquidityCurrent ratio 0.33× · 2/20
Longevity6 years trading (max 15) · 6/15
Filing complianceAll filings up to date · 15/15
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How is this score calculated?
Financial strength1/25 pts

Net worth compared to all companies in the same SIC code with published accounts. Top quartile earns the full 25 points.

Employees13/15 pts

Workforce size relative to sector peers from the most recent accounts. A larger team generally signals commercial scale.

Liquidity2/20 pts

Current assets ÷ current liabilities. A ratio above 2× earns full marks; between 1–2× scores partially; below 0.5× scores minimal points.

Longevity6/15 pts

One point per year of operation since incorporation, capped at 15. Older companies have a proven track record.

Filing compliance15/15 pts

Full 15 points when both annual accounts and confirmation statement are filed on time. Points are deducted for each overdue filing.

Maximum score is 100. Deductions apply for insolvency history, outstanding charges, going concern doubt, or disqualified officers.

Key FinancialsYear ending 31/12/2025

Net Worth

-£2.3M

Balance sheet strength

Cash

£394k

Cash in the bank

Net Current Assets

-£2.3M

Working capital

Current Assets

£1.2M

Current Liabilities

£3.5M

Fixed Assets

£865

Debtors

£759k

5avg. employees-3
Prepared with Caseware UK (AP4) 2025.0.111

EstimatesDerived

YearCurrent RatioImplied Profit
20250.33-£2.3M
20240.98-£2.4M
20236.82

Derived from filed accounts. Not audited figures.