Let's check out the Yahoo Finance charts of the day.
Cigna (CI): Shares are up in early trade, at around .23%. Activist Carl Icahn went public with his opposition to Cigna's proposed $54 billion purchase of Express Scripts, saying that the health insurer is overpaying and that Amazon.com represents an "existential threat" to pharmacy benefit managers.
Alibaba (BABA): Shares are up here, around 1.08%. Reuters reports that Alibaba will reportedly merge its food delivery units and raise funds for the combined business.
GlaxoSmithKline (GSK): Shares up here, around 1.83%. The drugmaker has named Iain MacKay from global bank HSBC as its new chief financial office as of January 14, 2019.
For more on today's big stock movers check out the Final Round, live at 3:55 p.m. ET, right here on Yahoo Finance.