I found the below information from the Appeal From The United States Court of Federal Claims case No. 95-CV-0039
It says that 2/3 executed received distributions
WMI subsequently reached a settlement with the LTW class, whereby the
LTW holders were offered a distribution of cash as well as a percentage of the
common stock of the reorganized WMI that would emerge from Chapter 11. The
LTW plaintiffs stipulated that all claims asserted by the LTW holders in the
adversary action “shall be deemed dismissed, with prejudice.” A.1189, ¶ 6.
Distributions of cash and shares of common stock of the reorganized WMI were
made on April 17, 2012, to “those LTW holders who executed and delivered
releases.” A.1167. LTW holders owning approximately two-thirds of the
outstanding warrants have executed releases and received their distributions. The
17
releases included releases of all claims by the executing LTW holders against
WMI, the FDIC, and JPMorgan.
So if 2/3 opted in that leaves about 37,000,000 shares outstanding.