Facebook CEO Mark Zuckerberg is taking steps toward fulfilling his promise to donate 99 percent of his Facebook stock to charity.

Zuckerberg and his wife, Priscilla Chan made their first cash infusion into their for-profit charitable group, the Chan Zuckerberg Initiative (CZI). On Wednesday and Thursday they sold 767,905 shares they had transferred to the organization, which was worth about $95 million, according to CNN Money.

A spokesperson for CZI declined to specify to The Huffington Post what projects the recent transaction will fund.

Zuckerberg and Chan announced the launch of CZI in December in a letter to their newborn daughter, Max. The couple pledged to give away 99 percent of their Facebook shares or around $45 billion to the cause.

For your generation to live in a better world, there is so much more our generation can do, Zuckerberg wrote in the letter . Today your mother and I are committing to spend our lives doing our small part to help solve these challenges.