The "old boys club" in the boardroom is alive and well — and most prevalent among the biggest Japanese and Chinese companies.

French businesses meanwhile offer the most gender diversity on their boards of directors, according to a Bloomberg analysis of the boards of the world's 500 largest companies by market value.

Eleven percent of those companies worldwide didn't have a single woman on the board at the end of their most recent fiscal year, according to data compiled from company statements and filings. Of those with none, 15 were based in Japan and 13 in China.