I am not clear when you said some of Coop shares were used to purchase Nationstar. Remember when they came out of bankcruptcy they had limited resources to make such a big move. The Sources and Uses of Funds Statement For that period could give you a better insight as to how the merger was funded resulting in a subsequent reverse split. Also take a look at this article which will give you an idea how limited the resources were at that time. https://www.housingwire.com/articles/46343-meet-the-mr-cooper-group-nationstar-completes-merger-with-washington-mutual-parent-wmih/