Sierra's latest raise brings total investor commitment past $1B as its AI agents expand from support into sales, retention and the full customer lifecycle.

The Gist

Sierra raises $950M at $15B valuation. Tiger Global and GV led the round, bringing Sierra's total capital past $1 billion and tripling its valuation from the $4.5 billion it carried just 18 months ago.

From support to the full customer lifecycle. Sierra-built agents have expanded beyond order tracking and password resets into mortgage origination, insurance claims, subscription management and healthcare revenue cycle — a shift the company frames as moving from one-time transactions to ongoing customer relationships.

Fortune 50 adoption backs the momentum.…