Sierra closed a $950 million round led by Tiger Global and GV, pushing its valuation past $15 billion. The funding will accelerate its push to become the global benchmark for AI‑powered customer experience.

The platform now serves over 40 % of the Fortune 50, with agents handling billions of interactions—from home refinancing to insurance claims. Sierra’s rapid adoption showcases how AI can replace legacy IVR systems.

Clients launch agents in record time: Nordstrom debuted a voice bot in five weeks; Singtel rolled out a solution in ten weeks, achieving 70 % resolution rates; Cigna cut patient authentication time by 80 % in eight weeks.

By moving beyond simple support, Sierra’s agents personalize, anticipate, and drive outcomes across the entire customer lifecycle, positioning the company as a key enabler for enterprises seeking end‑to‑end AI transformation.