# Sierra Technologies

Startup profile on Capital Atlas: https://capitalatlas.ai/startups/sierra-technologies

- Industry: Software
- Headquarters: San Francisco, US
- Website: www.sierra.ai
- Total disclosed funding: $1.4B
- Latest round: Series E (May 4, 2026)
- Investors on record: 6

## About

Founded in 2023 and based in California, US, Sierra Technologies, Inc. operates as a software company that offers conversational AI solutions. The company was founded by Bret Taylor and Clay Bavor. In May 2026, Sierra Technologies, Inc. raised USD 950 million in series E funding co-led by new investors Tiger Global Management and GV, with participation from returning investors Benchmark, Sequoia, and Greenoaks Capital. Other unspecified investors also participated in the round.

Sierra offers a conversational AI platform for small and medium-sized businesses. The company’s product line includes an AI agent that can be used by companies to improve their customer experience and an Agent OS, a cloud-based operating system that uses the company’s software developer’s kit (Agent SDK) to develop and deploy conversational AI agents. The agent can answer customer questions, solve problems, and take action on customer requests. Its client base includes Sonos, SiriusXM, and Weight Watchers.

The company will use the May 2026 funding to support its growth and further development of its AI customer service platform.

## Funding rounds

- Series E, May 4, 2026, $950M — Benchmark, Sequoia, Tiger Global Management, GV, Greenoaks Capital
- Series C, Sep 2, 2025, $350M — Greenoaks Capital
- Series B, Jan 26, 2024, $85M — Benchmark, Hong Shan

## Investors

- Benchmark (https://capitalatlas.ai/funds/benchmark) — Series B, Series E
- Hong Shan — Series B
- Greenoaks Capital (https://capitalatlas.ai/funds/greenoaks-capital) — Series C, Series E
- Sequoia (https://capitalatlas.ai/funds/sequoia) — Series E
- Tiger Global Management (https://capitalatlas.ai/funds/tiger-global-management) — Series E
- GV (https://capitalatlas.ai/funds/gv) — Series E