Wilshire Indexes' UK division has entered administration, signaling a potential collapse of the once-pioneering index provider, according to Financial Times Markets. CEO Mark Makepeace's LinkedIn activity and deleted posts suggest the sale of key assets is imminent. This development underscores the immense difficulty for new entrants to challenge the dominance of the Big Three (S&P Dow Jones, MSCI, FTSE Russell) in the lucrative index business.

The company's innovative Wilshire 5000 index, launched in 1974 as the first benchmark for the entire US market, now faces an uncertain future.