Brevan Howard, Stone Milliner founders back data firm Qi LONDON (Reuters) - Two of Europe's leading macro hedge fund investors are backing a machine learning data analytics firm that aims to give traders an edge in picking winning bets across stocks and indexes. Alan Howard, founder of Brevan Howard, and Jens-Peter Stein, founder of Stone Milliner, took part in the latest funding round for analytics firm Quant Insight (Qi), which aims to show how stocks are influenced by macroeconomic factors.