Industry sources that Samsung is hording the majority of the Snapdragon 835 SoCs to itself, causing other companies to have to use older, less desirable chipsets. The 835 is Qualcomm's design, but is being made using Samsung's 10nm manufacturing technology.
http://www.notebookcheck.net/Samsung-gets-first-dibs-on-Snapdragon-835-production-others-wait-until-April.193698.0.html