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A third of the companies listed come from Poland, followed by those from the Czech Republic, while Slovenian companies represent 3.6%.

Given Slovenia's GDP of EUR 35bn compared to Poland's EUR 380bn, "this is a good result", Deloitte Slovenija official Janez Škrubej said as he presented the survey to reporters in Ljubljana on Wednesday.

He said the feature of this year's survey was a slowdown in company revenues; the growth in revenues of all 500 companies listed dropped to 3.3% from 9.8% in a year.

The list, based on the companies' consolidated sales revenue in 2012, is topped by Polish oil company PKN (EUR 28.7bn), followed by its Hungarian counterpart MOL (EUR 19.2bn) and Czech car maker Škoda (EUR 10.4bn).

The leading Slovenian company, Petrol generated EUR 3.8bn in sales revenue last year to rank 32nd, followed by retailer Mercator in 44th and power utility HSE in 85th.

The list includes more companies from Slovenia than any other country in the region of former Yugoslavia, but the top ranking company is Croatia's oil company INA.

Croatian food conglomerate Agrokor placed 30th, but had it completed the takeover of Slovenia's Mercator, Agrokor would have ranked 13th or 14th.

Deloitte has also compiled lists of top 50 banks and insurance companies in the region. Only NLB made it to the list of largest banks by assets in 2012, but slipped four spots to 13th.

The list of insurance companies by gross premiums written includes five Slovenian companies, one more than last year. Zavarovalnica Triglav ranks highest in 7th, one down from a year ago.

Sava Re group made it among the top 50 for the first time ever, but the group would have placed among the top ten had it completed the takeover of Zavarovalnica Maribor, Kumar said.