Bristol shares rose $ 1.30 , or 5 percent , to $ 28.20 , after closing at $ 26.90 on the New York Stock Exchange .
Shares of Bristol-Myers rose to $ 28 in electronic trading from the $ 26.90 close on the New York Stock Exchange .
A coalition of campaign groups , including the militant national students body , is backing the protests , which the NLC called in defiance of a court order banning them .