民丰特纸：控股股东拟2000万元至4000万元增持股份

Group 1 - The core point of the article is that Minfeng Special Paper (600235) announced a plan for its controlling shareholder, Minfeng Group, to increase its stake in the company through centralized bidding within six months [1] - The total number of shares to be acquired will be no less than 3 million shares and no more than 6 million shares [1] - The total investment amount for the share buyback will be no less than 20 million yuan and no more than 40 million yuan [1]