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What does “100% stock dividend” mean?
A 100% stock dividend means that you get one share of the "stock dividend" for every share you own. For example, Google did this in 2014 when they gave all of their Class A shareholders one class C share for every Class A that they owned. If the 100% stock dividend is for the exactly the same stock, it is basically the same as a 2-for-1 stock split. If, however, the 100% stock dividend is to give you a different stock, then this is typically due to a corporate reorganization or demerger/spinoff event. Some countries have different tax treatments for the events - for example, with demergers in Australia, Class Rulings need to be obtained from the Australian Taxation Office to declare demergers as tax free.  A recent demerger was in Australia as South32, demerged from BHP Billiton. References: http://economix.blogs.nytimes.com/2014/04/02/the-many-classes-of-google-stock/ http://www.bhpbilliton.com/investors/shareholderinfo/demerger-taxation-information