IONIS USA LIMITED
Active Files dormant accounts to 31 December 2024 Company number 05508379
IONIS USA LIMITED (company number 05508379) is a private limited company incorporated on 14 July 2005. Its status on the Companies House register is Active. Its registered office is in 25 Old Broad Street, EC2N 1HQ. Its nature of business (SIC 2007) is research and experimental development on biotechnology (72110). Its latest accounts we hold, for the period ending 31 December 2024, report net assets of £1. The company files dormant accounts. The latest, to 31 December 2024, report no trading.
Source: Companies House register, as at 2 October 2026. How to cite this page
Information only, not advice. Register details and accounts figures are the company's own filings, shown as filed: CompanyStack does not audit or verify them and accepts no responsibility for decisions made on them. Check important facts at Companies House.
Company Report on IONIS USA LIMITED (PDF)
The register, the accounts and the people behind the company in one PDF, for your own business use.
- Summary and Health Score, with the reasons behind the score
- Red flags and what changed in the last 12 months
- Key figures against the year before, and filing deadlines
- Financials ledger: up to 10 years of filed accounts
- Who runs and owns it: directors, secretaries and PSCs
- Charges, filing history and methodology
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What dormant means
The company's latest accounts were filed as dormant: it reported no significant transactions in the year. Its register status can still be Active.
Dormant company: what it means on Companies House — what happens next, how long it lasts and what to do if the company owes you money.
Company details
- Company number
- 05508379
- Status
- Active
- Company type
- Private Limited Company
- Incorporated
- 14 July 2005
- Country of origin
- United Kingdom
- Registered office
- TOWER 42, LEVEL 30
INTERNATIONAL FINANCE CENTRE
25 OLD BROAD STREET
LONDON
EC2N 1HQ
Nature of business (SIC 2007)
Accounts and confirmation statement
- Accounting reference date
- 31 December
- Accounts filed
- Dormant accounts for the period to 31 December 2024 (no trading reported)
- Accounts last made up to
- 31 December 2024
- Next accounts due
- 31 December 2026
- Confirmation statement last made up to
- 14 July 2025
- Next confirmation statement due
- 28 July 2026 Overdue
Financial summary
| Period ending | 31 December 2024 | 31 December 2023 | 31 December 2022 | 31 December 2021 | 31 December 2020 | 31 December 2019 | 31 December 2018 | 31 December 2017 | 31 December 2016 | 31 December 2015 | 31 December 2014 | 31 December 2013 | 31 December 2012 | 31 December 2011 | 31 December 2010 | 31 December 2009 | 31 December 2008 | 31 December 2007 | 31 December 2006 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cash at bank | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 |
| Net assets | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 | £1 |
Figures read from filings at Companies House (ixbrl) and checked; see how we read them. Small-company accounts often omit turnover and profit. Spotted an error? Tell us.
Control, officers and charges
- Persons with significant control
- 1 current (1 including ceased)
- Corporate controllers
- Ionis Pharmaceuticals, Inc.
Previous names
- ISIS USA LIMITED (changed 31 January 2016)
Questions about IONIS USA LIMITED
Is IONIS USA LIMITED active?
Yes. The Companies House register shows the company's status as “Active”. (Companies House register, as at 2 October 2026.)
When was IONIS USA LIMITED incorporated?
IONIS USA LIMITED was incorporated on 14 July 2005, according to the Companies House register. (Companies House register, as at 2 October 2026.)
Where is IONIS USA LIMITED registered?
Its registered office is in 25 Old Broad Street, EC2N 1HQ. (Companies House register, as at 2 October 2026.)
Who controls IONIS USA LIMITED?
The register lists 1 current person with significant control (1 including those who have ceased). Corporate controllers named on the register: Ionis Pharmaceuticals, Inc.. The register shows control, not a list of shareholders. Individuals are named at https://find-and-update.company-information.service.gov.uk/company/05508379/persons-with-significant-control. (Companies House register, as at 2 October 2026.) Who owns a UK limited company: shareholders, PSCs and what the register shows
When are IONIS USA LIMITED's next accounts due?
The register shows the next accounts as due by 31 December 2026. Its latest accounts on the register were made up to 31 December 2024. (Companies House register, as at 2 October 2026.)
Does IONIS USA LIMITED file dormant accounts?
Yes. The register gives the category of its latest accounts, made up to 31 December 2024, as “Dormant”. (Companies House register, as at 2 October 2026.) What a dormant company is and what it must file
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Industry overview: 4,029 active companies in SIC 72110
Other active companies registered at EC2N 1HQ
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Official register entry: IONIS USA LIMITED on Companies House.
Developers can fetch this profile as JSON with GET https://api.companystack.co.uk/company/05508379 — see the API documentation and pricing.