Brin’s Mystery $700 Million Stock Gift Went to Philanthropies

Sergey Brin ’s mystery gift this week of Alphabet Inc. shares valued at almost $700 million went to a trio of philanthropic organizations, according to a spokesperson for his family office.

The largest portion of Brin’s gift went to Catalyst4, a nonprofit which Brin started in 2021 with a dual purpose of supporting research into central nervous system diseases and climate-change solutions, the spokesperson said Saturday. Those 3.2 million shares were split evenly between Alphabet Class A and Class C stock.