Byron Allen Photo by Jason Mendez/Getty Images for Tribeca Festival Share on Facebook Share on X Google Preferred Share to Flipboard Show additional share options Share on LinkedIn Share on Pinterest Share on Reddit Share on Tumblr Share on Whats App Send an Email Print the Article Post a Comment Starz is adopting a so-called "Poison Pill" after the media mogul Byron Allen acquired 10.7 percent of the company last week in a surprise deal. The poison pill, also called a shareholder rights plan, is typically enacted by companies seeking to ward off hostile or unwelcome acquisition efforts.