Slovnaft a.s.
- Refinery and petrochemical company processing crude oil and nation wide chain of petrol stations. Part of Hungarian MOL group. Site includes media and investor information, product list and company's environmental policy.
- http://www.slovnaft.sk/

SPP a.s.
- Slovensky Plynarensky Priemysel (in English: Slovak Gas Industry) is major Slovak firm with core activities including transit of natural gas and distribution of gas and its supply to customers. Site contains ecological activities of company.
- http://www.spp.sk/