SONARDYNE INTERNATIONAL LIMITED
Company number 01299452 · Monitor this company
Free AI analysis
Have an AI read this company's filings and write an assessment — financial health, risks, and what the numbers say.
Shareholders' funds
£41,610,007
Balance sheet as at 2023-12-31
What it does
The principal activity of the company continued to be that of the design, manufacture and supply of electronic and mechanical instruments for the offshore energy, ocean science and maritime security and defence markets.
The company's own description, from its latest filed accounts.
Overview
- Company type
- Private Limited Company
- Incorporated
- 1977-02-21
- Employees
- 309 (2023 accounts · was 266 in 2022)
- Registered office
- Ocean House Blackbushe Business Park, Saxony Way, Yateley, Hampshire, GU46 6GD
- Postcode
- GU46 6GD
- Capital
- 12,286,362 GBP
- Accounts category
- Full
- Charges
- 0 outstanding
Accounts
- Last made up to
- 2025-12-31
- Next due by
- 2027-09-30
- Financial year end
- 31 December
Confirmation statement
- Last statement dated
- 2025-09-23
- Next due by
- 2026-10-07
Nature of business (SIC)
- 26511 Manufacture of electronic measuring, testing etc. equipment, not for industrial process control
Officers 3 current · 33 resigned
Group structure 3 subsidiaries
Controlled by COVELYA GROUP LIMITED — since 2020-03-31
From persons-with-significant-control filings on the public register.
Public contracts won 3
£594,389 total awarded value where published.
Contains public sector information licensed under the Open Government Licence v3.0 (Contracts Finder).
Licensed visa sponsor
Licensed by the Home Office to sponsor worker visas: Global Business Mobility: Graduate Trainee (Temporary Worker (A rating)), Global Business Mobility: Senior or Specialist Worker (Worker (A rating)), Skilled Worker (Worker (A rating)).
Matched by registered name to the register of licensed sponsors (Home Office, updated daily) — check the register itself before relying on it. Contains public sector information licensed under the Open Government Licence v3.0.
Modern slavery statement
Registered a modern slavery statement for 2026 (period to 2025-12-31) as part of the COVELYA GROUP LIMITED group statement — 7 years on the registry.
Read the statement summary on the government modern slavery statement registry. Contains public sector information licensed under the Open Government Licence v3.0.
Gender pay gap
37.3%
Women's median hourly pay below men's, 2025/26 · in the bottom 10% for parity
Contact details
- Website
- sonardyne.com
Sonardyne have been engineering the future of underwater technology for over 50 years. Track, monitor, image, survey, navigate.
Previous company names
| Name | Date changed |
|---|---|
| SONARDYNE (WESTERN) LIMITED | 1992-06-15 |
| SONARDYNE CONSULTANTS LIMITED | 1983-03-21 |
| SONARDYNE MARKETING LIMITED | 1980-12-31 |
Previous registered addresses 1
| Address | Changed on |
|---|---|
| STATION APPROACH IND EST, FLEET, ALDERSHOT, HANTS GU13 8QY | 1996-07-15 |
Among its peers
Top 5%
by shareholders' funds, of 29 similar companies in GU
The largest employer among its local peers (309 staff).
3rd oldest of its local peers, trading since 1977.
Competitors Guildford
This company ranks 1 among manufacture of electronic measuring, testing etc. equipment, not for industrial process control in Guildford.
The class of 1977
51%
of the 7,313 companies incorporated in 1977 are still active today; 41% have since been dissolved.
A fact about the year, not a forecast for this company.
Property in England & Wales 5 titles
- Freehold
- 4
- Leasehold
- 1
- Most recent registration
- 2021-03-01
- Price paid, where recorded
- £325,000
- Where
- Hampshire (4), City Of Plymouth (1)
| Title number | County | Tenure | Registered | Price paid |
|---|---|---|---|---|
| DN300400 | City Of Plymouth | Leasehold | 2021-03-01 | £325,000 |
| HP625040 | Hampshire | Freehold | 2012-12-03 | — |
| HP625041 | Hampshire | Freehold | 2012-12-03 | — |
| HP626610 | Hampshire | Freehold | 2012-12-03 | — |
| HP494782 | Hampshire | Freehold | 2007-08-31 | — |
For addresses and the authoritative register entry, use HM Land Registry's official search (£3 per title).
Information produced by HM Land Registry. © Crown copyright 2026. Dataset as at 2026-08.