Sierra helps businesses to build and deploy AI agents that communicate with users across channels such as chat, voice, email, and messaging.
Sierra has raised $950.0M in total funding. The most recent round was Series E. The last funding was announced in May 2026.
Sierra's investors include Sequoia Capital, Thrive Capital, SV Angel, Benchmark, Greenoaks.
Sierra is headquartered in San Francisco, United States.
Sierra helps businesses to build and deploy AI agents that communicate with users across channels such as chat, voice, email, and messaging.
Sierra is at the Series E stage.
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"Sierra — Funding & Investors." VCBacked, May 4, 2026, https://www.vcbacked.co/company/sierra. Accessed July 18, 2026.
VCBacked. (2026). Sierra — Funding & Investors. Retrieved July 18, 2026, from https://www.vcbacked.co/company/sierra
{{cite web |title=Sierra — Funding & Investors |url=https://www.vcbacked.co/company/sierra |website=VCBacked |access-date=July 18, 2026}}Profile data sourced and verified per the VCbacked methodology · Last funding round dated