** Shares of Central Bank of India CBI.NS fall 6% to 31.88 rupees
** Set for biggest daily pct drop since April 2025
** Government to sell up to 4% stake in lender via Offer for Sale (OFS), with an option to offload additional 4% through greenshoe
** Sets floor price at 31 rupees per share, a discount of 8.6% to Thursday's closing price
** OFS opens for non-retail investors on Friday; retail investors to bid on Monday
** Trading vols at about 20.8 million shares, vs 30-day average of 5.2 million shares
** YTD, stock down ~14.2%
(Reporting by Bipasha Dey in Bengaluru)
((Bipasha.Dey@thomsonreuters.com;))