Facebook Inc. Chief Executive Officer Mark Zuckerberg added more to his net worth in one morning than he has during the first four months of 2016.

Zuckerberg saw his fortune rise by more than $4 billion by midday Thursday in New York, reaching $51.5 billion as shares surged on financial results that blew past analyst estimates. As of Wednesday evening, Zuckerberg’s net worth had grown by $1.3 billion since year-end, according to the  Bloomberg Billionaires Index.