After only 4 years we finally have one of the most needed, long awaited and desperately desired updates to the game – Item Stack limit changes with Patch 4.1 from 99 to 9999! Thank you!!!
► Crafting Changes in 4.1 | 02.01.2016, 02:27 PM
One of the issues we have seen brought up quite a bit in this thread is storage space. Although we aren’t adding new bays at this time, one change to help with storage is that any item which previously stacked to 99, will now stack to 9,999. This change is coming in Game Update 4.1