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Company number
15865489

A.T. BIO LIMITED

Active
✓ Active company on the official register. Next accounts due 30 April 2027.

Company details

Registered name
A.T. BIO LIMITED
Company number
15865489
Registered office
LEWIS HOUSE GREAT CHESTERFORD COURT, GREAT CHESTERFORD, SAFFRON WALDEN, ESSEX, CB10 1PF
Company type
Private Limited Company
Incorporated on
30 July 2024
Status
Active
Age
2 years
Nature of business (SIC)
70229 — Management consultancy activities other than financial management
Accounts — next due
30 Apr 2027
Accounts — last made up to
31 Jul 2025
Confirmation statement — next due
12 Aug 2026
Confirmation statement — last
29 Jul 2025

What the register says

Facts from the register, with the dates they are filed under. Not a score: what they mean is for you to judge, and every line can be checked against Companies House itself.

Companies House register snapshot, read 02/09/2026.

People with significant control

Beneficial owners holding over 25% of shares, voting rights or the right to appoint directors

Dr Tonya Jane Berthoud
Notified 30/07/2024

Corporate structure

Who controls this company, and who they control in turn

1 controller Drag to move · scroll to zoom · double-click to expand
Company Person Current control Ended

Connections

Dr Tonya Jane Berthoud
born 10/1968 · England owns 75–100% of shares · holds 75–100% of votes Notified 30/07/2024

Change history

Reconstructed from the dated records Companies House publishes

DateChangeWasNow
30/07/2024 Person with significant control added Dr Tonya Jane Berthoud

Documents for A.T. BIO LIMITED

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Company extract£1.99

The full registration record as held today — name, number, status, registered office, company type, previous names, officers, PSC and SIC codes, timestamped for your file.

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Financial statements£3.99

Every figure the company’s own accounts state, across each filed period, with year-on-year movement. Most UK companies file small or micro-entity accounts — a balance sheet and a headcount, no turnover or profit.

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Ownership report£3.99

Who controls the company: persons with significant control, the nature of that control, the ownership graph and every other company those controllers hold.

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Data protection register

No entry found on the ICO register of fee payers under this name.

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Get this company via API

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GET /v1/company/gb/15865489
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Read the API docs

Frequently asked questions

What is the company number of A.T. BIO LIMITED?
According to the official registry, the company number of A.T. BIO LIMITED is 15865489.
Where is A.T. BIO LIMITED registered?
The registered office is LEWIS HOUSE GREAT CHESTERFORD COURT, GREAT CHESTERFORD, SAFFRON WALDEN, ESSEX, CB10 1PF.
What is the SIC code of A.T. BIO LIMITED?
The nature of business is recorded under SIC code 70229 — Management consultancy activities other than financial management.
Who controls A.T. BIO LIMITED?
Dr Tonya Jane Berthoud is recorded as a person with significant control.
When are the next accounts of A.T. BIO LIMITED due?
The next annual accounts are due by 30 April 2027, and the last accounts were made up to 31 July 2025.

About A.T. BIO LIMITED (15865489)

A.T. BIO LIMITED is a private limited company incorporated on 30 July 2024 and registered in the United Kingdom under company number 15865489. Its registered office is at LEWIS HOUSE GREAT CHESTERFORD COURT, GREAT CHESTERFORD, SAFFRON WALDEN, ESSEX, CB10 1PF. The recorded nature of business is management consultancy activities other than financial management (SIC 70229). The company is currently active , with statutory accounts last made up to 31 July 2025. , and the person with significant control is Dr Tonya Jane Berthoud. This profile is provided by opendata.bot by Noetikos, aggregating official data from Companies House bulk data , last refreshed 2 September 2026.

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