New Delhi, Sept. 7 -- Lululemon founder Chip Wilson's estimated $6.1 billion fortune is facing renewed scrutiny following his divorce proceedings, even as the athleticwear company he founded battles slowing sales, and falling market share.

Wilson, who founded Lululemon in Vancouver in 2000, is divorcing his wife of 20 years, Shannon "Summer" Wilson. According to reports, the couple does not have a prenuptial agreement, while family litigation filed in the British Columbia Supreme Court remains sealed.

The divorce has drawn attention to Wilson's substantial holdings in Lululemon and other companies, as well as assets controlled through his family investment structure.

Wilson opened the first Lululemon store in Vancouver in 2000 and took...