 Shares of AGCO Corp. AGCO, 0.50 rose 0.3 in midday trading Thursday, after the the maker of agricultural machinery declared a variable special dividend of 4.50 a share, and boosted its regular quarterly dividend by 20. The special dividend will be payable June 21 to shareholders of record on May 20, while the new regular dividend of 24 cents a share, up from 20 cents a share, will be payable June 15 to shareholders of record on May 16. 