The boost only erased a small portion of investors' recent losses on this stock, which has underperformed the market by a wide margin over the past one-year and five-year periods.
April's rally came as Wall Street gained confidence in the business ahead of Discovery's upcoming merger with rival Scripps Networks (SNI). That acquisition has raised Discovery's debt needs, but strong cash flow might allow management to quickly resume aggressive stock buybacks, perhaps as early as late 2018, according to an analyst at Deutsche Bank who upgraded the stock in late April .
Temporary swings aside, Discovery's long-term results will depend on its ability to keep advertising revenue rising in its international markets while it strengthens its direct-to-consumer distribution platform.
Both of these metrics should be aided by the addition of Scripps Networks, but a lot can go wrong in a $15 billion acquisition like this. That's why investors will be listening for updates about the merger, in addition to the latest ratings trends, when Discovery reports first-quarter earnings results on May 8.