# Sierra funding rounds and investors

As of 13 Oct 2026, Sierra has raised $1.58B across 4 verified rounds on record; latest: $950 million Series E led by Tiger Global Management and Google’s GV, announced 4 May 2026.

Sierra helps businesses build better, more human customer experiences with AI.

Website: https://sierra.ai  
Headquarters: San Francisco  
Page: https://fireround.dev/companies/sierra.ai

## Verified rounds

| Announced | Round | Amount | Lead investors | Other investors | Sources |
| --- | --- | --- | --- | --- | --- |
| 2026-05-04 | Series E | $950 million | Tiger Global Management, Google’s GV | Benchmark Capital, Sequoia Capital, Greenoaks | [cnbc.com](https://www.cnbc.com/2026/05/04/bret-taylor-sierra-fundraise-openai.html) |
| 2025-09-04 | Funding round | $350M | Greenoaks | none named | [sierra.ai](https://sierra.ai/blog/theres-an-agent-for-that-and-it-runs-on-sierra) |
| 2024-10-28 | Funding round | $175 million | Greenoaks | Thrive Capital, Iconiq | [reuters.com](https://www.reuters.com/technology/artificial-intelligence/openai-chairs-ai-startup-sierra-gets-45-bln-valuation-latest-funding-round-2024-10-28) |
| 2024-02-13 | Funding round | $110 million | Sequoia Capital, Benchmark Capital | none named | [fortune.com](https://fortune.com/2024/02/13/bret-taylor-clay-bavor-ai-startup-sierra-110-million-funding-sequoia-benchmark) |

Source: Fireround (https://fireround.dev), an open-source funding feed. Each round is checked against the pages listed with it.