Bret Taylor's Sierra raises nearly $1 billion months after last capital push

Bret Taylor, co-founder and CEO of Sierra, speaking to CNBC at the World Economic Forum in Davos, Switzerland on Jan. 22nd, 2026. CNBC Artificial intelligence startup Sierra is raising nearly a billion dollars in a new funding round as venture capital investors search for winners in an ongoing deal spree. The San Francisco-based company brought in $950 million in fresh capital at a $15.8 post-money valuation, led by Tiger and Google's GV. …