Billionaire Couple Plans to Give Away Their $20 Billion Facebook Fortune

Former journalist Cari Tuna, along with her husband, Facebook cofounder Dustin Moskovitz, is one of the world’s most generous philanthropists.

Tuna and Moskovitz remain focused on a key part of their mission: ramping up grants that could help make AI models safer. (Photo: Seb Daly / Web Summit via Sportsfile Flickr) 

A decade ago, the couple donated $1 million to the Future of Life Institute to reduce artificial intelligence (AI) risk, Katie Thompson reported for Forbes Daily.

They later contributed $30 million to OpenAI’s nonprofit in 2017 through their foundation, and Moskovitz invested in Anthropic’s $124 million funding round in 2021.

Back then, both labs focused intensely on AI safety. Tuna emphasizes that neither the couple nor their foundation currently holds a stake in OpenAI, and their Anthropic stake (worth an estimated $500 million) was moved into a nonprofit vehicle in early 2025.

Much has changed in the world’s embrace of AI, with massive deals now being struck daily among the world’s biggest tech companies, investors, and governments.

But Tuna and Moskovitz remain focused on a key part of their mission: ramping up grants that could help make AI models safer—sometimes shaping work at OpenAI and Anthropic through research, policy advocacy, and lobbying.

The couple has said they intend to give away the vast majority of their fortune during their lifetimes.

They have already donated more than $4 billion and control another $11 billion from Moskovitz’s personal fortune, plus about $10 billion in their private foundation, the Good Ventures Foundation, along with additional funds in donor-advised accounts.