https://www.siliconvalley.com/2020/04/07/twitter-co-founder-jack-dorsey-pledges-1-billion-in-stock-to-covid-19-relief/

Jack Dorsey, the co-founder of Twitter and founder of Square Inc., announced Tuesday he will transfer $1 billion in stock to fund global COVID-19 relief efforts.

Dorsey says the stock represents about 28 percent of his net worth.