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 October 16, 2026.
VCBacked. (2026). Sierra — Funding & Investors. Retrieved October 16, 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=October 16, 2026}}Profile data sourced and verified per the VCbacked methodology · Last funding round dated