March 22 (Reuters) - WeWork lost $3.2 billion last year according to documents shown to prospective investors by the office-sharing startup in a pitch for $1 billion in investment and a stock market listing, the Financial Times here reported on Monday. The documents described losses narrowed from $3.5 billion in 2019 and that the company plans to go public at a valuation of $9 billion including debt, through a merger with a special purpose acquisition company, the report said. WeWork declined to comment on the report.