The largest technical testing and analysis companies in Reading

Ranked by shareholders' funds, from 39 active companies in the RG 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 Reading top 20

1. TSL LIGHTING LIMITED

£5,517,894 06457420 since 2007
2. DIAGNOSTICA STAGO UK LTD

£5,100,000 05335357 since 2005
3. MARCHWOOD SCIENTIFIC SERVICES LIMITED

£1,179,342 03604766 since 1998
4. INDEPENDENT TRAINING STANDARDS SCHEME AND REGISTER LIMITED

£605,955 03947778 since 2000
5. THE ENVIRONMENTAL LABORATORY LIMITED

£573,886 03882193 since 1999
6. PRESSURE TEST LIMITED

£447,122 03092881 since 1995
7. ARVIND PHARMA LIMITED

£323,002 09288695 since 2014
8. PC ENVIRONMENTAL HOLDINGS LIMITED

£250,600 10461629 since 2016
9. PHARMA QUALITY PARTNERS LTD

£201,591 08732166 since 2013
10. VERIF-I SG LTD

£177,405 11269190 since 2018
11. REDCURRENT LTD

£150,997 07153759 since 2010
12. ALPA MEDICAL LTD

£122,081 10396331 since 2016
13. VEXSEAL LIMITED

£115,207 04565514 since 2002
14. ENVIRONMENTAL TEST SERVICES LIMITED

£47,386 03110350 since 1995
15. BLC VEHICLE SAFETY LTD

£26,393 06544211 since 2008
16. BE INSIGHTFUL LIMITED

£17,746 12137600 since 2019
17. BS IT CONSULTANTS LIMITED

£17,496 11666148 since 2018
18. PHAZE ELECTRICAL PAT TESTING LTD

£15,123 16197765 since 2025
19. NDW ELECTRONIC TESTING SERVICES LIMITED

£10,407 14450896 since 2022
20. PC ENVIRONMENTAL LIMITED

£7,984 03455714 since 1997