AOL stock plunged after it split from Time Warner in 2010, falling from $23 to under $12 a share last summer. But it's rebounded this year and closed Tuesday off 0.73% at $27.19. The runup last April was triggered in large part by a sale of patents to Microsoft for more than $1 billion. Activist investor Starboard Value had suggested such a patent sale but AOL insisted that it was already exploring a transaction before Starboard weighed in.