Shares of Warner Bros. Discovery were Thursday's top gainers on the S&P 500. Victor J. Blue/Bloomberg via Getty Images Close Key Takeaways News of a possible takeover bid helped send shares of two media and entertainment powerhouses streaming higher, while a blistering rally ran out of steam for a major enterprise software player. Shares of Synopsys (SNPS) jumped 13%, clawing back a portion of the previous session's 36% plunge. The volatility came after the electronic design automation software provider mis ...