The largest technical testing and analysis companies in Oxford

Ranked by shareholders' funds, from 27 active companies in the OX postcode area.

"Largest" here means shareholders' funds — what the most recent balance sheet says the company is worth. It is the only measure of size filed by enough companies to rank on.

Companies that have never filed accounts cannot appear, however big they are. Figures are as filed at Companies House and can be a year or more old.

Technical testing and analysis in Oxford top 20

1. ANALYTICAL SERVICES INTERNATIONAL LIMITED

£2,526,338 02704238 since 1992
2. RCD LOCKINGE LTD

£1,341,752 09088154 since 2014
3. AMIANTUS ENVIRONMENTAL CONSULTANTS LIMITED

£381,717 05648898 since 2005
4. GROUND INVESTIGATION SERVICES (SOUTHERN) LTD

£244,488 08561039 since 2013
5. GEOMAP LTD

£216,981 04643832 since 2003
6. CBS GLOBAL SOLUTION UK LIMITED

£105,865 10936524 since 2017
7. SERENOX LIMITED

£92,228 14255266 since 2022
8. MAUND GEO-CONSULTING LIMITED

£74,036 07488348 since 2011
9. SPARK MASON LTD

£46,553 03243597 since 1996
10. JPS CALIBRATION SERVICES LIMITED

£43,598 05629937 since 2005
11. EMPATHY ENVIRONMENTAL CONSULTANTS LIMITED

£25,563 06130157 since 2007
12. OPS QUAL LTD

£24,424 13001467 since 2020
13. G KHUTAN CONSULTING LTD

£16,852 15947419 since 2024
14. TERN AVIATION LIMITED

£9,100 05993893 since 2006
15. MNR IT TESTING SERVICES LTD

£7,094 14001468 since 2022
16. DENRIDGE ENGINEERING LIMITED

£177 04356748 since 2002
17. TEST MAGUS LIMITED

£101 08604626 since 2013
18. METALTEST UK LIMITED

£100 09972751 since 2016
18. CAMGREY LTD

£100 16244523 since 2025
20. BRITANNIA MINING SOLUTIONS (UK) LIMITED

£10 16196912 since 2025