---
title: "Sierra revenue and valuation"
description: "Sierra's ARR is estimated at $330M–$480M, last reported at $400M. Valued at $15.8B after raising $1.58B. Funding rounds and competitors."
url: https://www.tryspecter.com/revenue-valuation/sierra.md
canonical_url: https://www.tryspecter.com/revenue-valuation/sierra
publisher: Specter
last_updated: 2026-11-01
---

# Sierra revenue and valuation

Specter estimates Sierra's annual revenue at $330M to $480M and its valuation at $14.3B to $19.4B. The company last reported $400M ARR in October 2026 and was priced at $15.8B in May 2026.

Sierra builds and manages conversational AI agents for customer service across chat and voice.

- Estimated revenue: $330M to $480M (October 2026)
- Estimated valuation: $14.3B to $19.4B (October 2026)
- Last reported ARR: $400M (October 2026)
- Total funding: $1.58B
- Founded: 2023
- Headquarters: San Francisco, United States
- Employees: 1,155
- Sector: AI agents
- Specter Rank: #49,234

## Sierra revenue

Sierra grew from $100M ARR in November 2025 to $400M in October 2026. Specter's model puts current ARR between $330M and $480M, anchored to four reported figures.

| Reported figure | Date | Source |
| --- | --- | --- |
| $400M ARR | October 2026 | [AI and Developer Tooling: Key Developments](https://x.com/lunkertw/status/2116160909874004397) (x.com) |
| $200M ARR | May 2026 | [Sierra just hit $200M in ARR.](https://www.linkedin.com/posts/brettaylor_sierra-just-hit-100m-in-arr-just-seven-activity-7466233808489566209-I79f) (linkedin.com) |
| $150M ARR | February 2026 | [After Sierra reached $100M in ARR in seven quarters, we followed with our first-ever $50M quarter — kicking off our third year with over $1…](https://www.linkedin.com/posts/brettaylor_after-sierra-reached-100m-in-arr-in-seven-activity-7425542578688835585-8L5G) (linkedin.com) |
| $100M ARR | November 2025 | [AI startups are turning their revenue into recruiting bait](https://www.theverge.com/column/826172/ai-startup-arr-numbers-sierra-bret-taylor) (theverge.com) |

| Month | Specter estimate | Low | High |
| --- | --- | --- | --- |
| October 2026 | $400M | $330M | $480M |
| September 2026 | $350M | $240M | $510M |
| August 2026 | $300M | $230M | $400M |
| July 2026 | $260M | $210M | $330M |
| June 2026 | $230M | $185M | $280M |
| May 2026 | $200M | $98M | $300M |
| April 2026 | $182M | $146M | $230M |
| March 2026 | $165M | $136M | $200M |
| February 2026 | $150M | $125M | $180M |
| January 2026 | $131M | $104M | $165M |
| December 2025 | $114M | $93M | $141M |
| November 2025 | $100M | $83M | $120M |
| October 2025 | $72M | $35M | $109M |
| September 2025 | $70M | $36M | $105M |
| August 2025 | $34M | $18M | $50M |
| July 2025 | $31M | $12M | $50M |
| June 2025 | $34M | $14M | $54M |
| May 2025 | $30M | $13M | $46M |
| April 2025 | $28M | $12M | $44M |
| March 2025 | $26M | $14M | $38M |
| February 2025 | $26M | $12M | $40M |
| January 2025 | $22M | $10M | $35M |
| December 2024 | $20M | $8.4M | $32M |
| November 2024 | $18M | $7.7M | $29M |
| October 2024 | $15M | $6.5M | $23M |
| September 2024 | $12M | $5.8M | $18M |
| August 2024 | $13M | $3.2M | $22M |
| July 2024 | $7.3M | $3.9M | $11M |
| June 2024 | $6M | $3.2M | $9M |

## Sierra valuation

Sierra's valuation rose from $1B at its venture round in February 2024 to $15.8B at its Series E in May 2026. Specter's live estimate sits between $14.3B and $19.4B.

| Month | Specter estimate | Low | High |
| --- | --- | --- | --- |
| October 2026 | $16.7B | $14.3B | $19.4B |
| September 2026 | $15.6B | $12.3B | $19.7B |
| August 2026 | $15.8B | $12.5B | $20B |
| July 2026 | $16B | $13B | $19.7B |
| June 2026 | $15.8B | $13.1B | $19B |
| May 2026 | $15.8B | $13.1B | $19B |
| April 2026 | $14.1B | $10.8B | $18.4B |
| March 2026 | $12.6B | $9.93B | $15.9B |
| February 2026 | $11.2B | $9.11B | $13.8B |
| January 2026 | $10B | $8.32B | $12B |
| December 2025 | $10B | $8.32B | $12B |
| November 2025 | $10B | $8.32B | $12B |
| October 2025 | $10B | $8.2B | $12.2B |
| September 2025 | $10B | $8.32B | $12B |
| August 2025 | $10B | $8.28B | $12.1B |
| July 2025 | $10B | $8.29B | $12.1B |
| June 2025 | $10B | $8.32B | $12B |
| May 2025 | $8.92B | $7.05B | $11.3B |
| April 2025 | $7.96B | $6.35B | $9.98B |
| March 2025 | $7.1B | $5.69B | $8.86B |
| February 2025 | $6.34B | $5.13B | $7.83B |
| January 2025 | $5.65B | $4.55B | $7.02B |
| December 2024 | $5.04B | $4.13B | $6.16B |
| November 2024 | $4.5B | $3.74B | $5.41B |
| October 2024 | $4.5B | $3.74B | $5.41B |
| September 2024 | $3.73B | $2.59B | $5.36B |
| August 2024 | $3.09B | $2.22B | $4.31B |
| July 2024 | $2.56B | $1.99B | $3.29B |
| June 2024 | $2.12B | $1.63B | $2.77B |

| Reported valuation | Month | Source |
| --- | --- | --- |
| $15.8B | June 2026 | [linkedin.com](https://www.linkedin.com/posts/sicross_im-delighted-to-share-that-ive-joined-sierra-activity-7475211674979995648--_lL) |
| $15.8B | May 2026 | Funding round |
| $10B | January 2026 | [forbes.at](https://www.forbes.at/artikel/wie-ki-2025-vermoegen-in-rekordtempo-schuf) |
| $10B | December 2025 | [finance.yahoo.com](https://finance.yahoo.com/news/bret-taylor-sierra-reaches-100m-230008702.html) |
| $10B | November 2025 | [forbes.at](https://www.forbes.at/artikel/wie-zwei-silicon-valley-veteranen-mit-ki-den-kundenservice-neu-definieren) |
| $10B | September 2025 | Funding round |
| $10B | June 2025 | [techcrunch.com](https://www.techcrunch.com/2025/06/19/bret-taylors-sierra-raises-350m-at-a-10b-valuation/) |
| $4.5B | November 2024 | [startupitalia.eu](https://startupitalia.eu/tech/ogni-casa-avra-un-robot-umanoide-come-suggerisce-musk-lai-in-cattedra-e-davvero-migliore-dei-prof/) |
| $4.5B | October 2024 | Funding round |
| $1B | February 2024 | Funding round |
| $15B | January 2024 | [theinformation.com](https://www.theinformation.com/briefings/ai-startup-sierra-says-raising-15-billion-valuation) |
| $10B | October 2023 | [techcrunch.com](https://www.techcrunch.com/latest/3042696/bret-taylors-sierra-raises-350m-at-a-10b-valuation/) |
| $10B | June 2023 | [techcrunch.com](https://www.techcrunch.com/latest/bret-taylors-sierra-raises-350m-at-a-10b-valuation/) |
| $10B | May 2023 | [techcrunch.com](https://www.techcrunch.com/venture/3042696/bret-taylors-sierra-raises-350m-at-a-10b-valuation/) |
| $10B | October 2021 | [techcrunch.com](https://www.techcrunch.com/startups/3042696/bret-taylors-sierra-raises-350m-at-a-10b-valuation/) |

## Sierra funding rounds

| Date | Round | Raised | Post-money | Lead investors |
| --- | --- | --- | --- | --- |
| 4 May 2026 | Series E | $950M | $15.8B | Tiger Global Management, Google Ventures |
| 4 Dec 2025 | Venture round | Undisclosed | Undisclosed | SoftBank Vision Fund |
| 4 Sep 2025 | Venture round | $350M | $10B | Greenoaks |
| 28 Oct 2024 | Venture round | $175M | $4.5B | Greenoaks |
| 13 Feb 2024 | Venture round | $110M | $1B | Sequoia Capital, Benchmark |

## Sierra vs competitors

Enterprise conversational AI splits between high-level autonomous reasoning and infrastructure-heavy voice automation.

| Company | Estimated revenue | Estimated valuation |
| --- | --- | --- |
| Sierra | $330M–$480M | $14.3B–$19.4B |
| Fin (Previously Intercom) (fin.ai) | $290M–$430M | $260M–$1.48B |
| PolyAI (poly.ai) | $37M–$139M | $600M–$1.06B |
| [24]7.ai (247.ai) | $250M–$1.15B | $940M–$4.44B |
| Decagon (decagon.ai) | $51M–$66M | $4.26B–$6.63B |

## Questions

### What is Sierra's revenue?

Specter estimates Sierra's annual recurring revenue at $330M to $480M as of October 2026. Sierra last reported $400M ARR in October 2026, up from $100M in November 2025.

### What is Sierra's valuation?

Sierra's latest post-money valuation is $15.8B, from a May 2026 Series E. Specter's live estimate is $14.3B to $19.4B.

### What is Sierra's revenue multiple?

Sierra is valued at about 39.5× ARR, based on its $15.8B May 2026 valuation and $400M last reported ARR. That works out to roughly $346K of ARR per employee.

### How much funding has Sierra raised?

$1.58B across five rounds, from a $110M venture round in February 2024 to a $950M Series E in May 2026.

### Who invested in Sierra?

10 investors, including Benchmark, Google Ventures, Greenoaks, Sequoia Capital, SoftBank Vision Fund and Tiger Global Management.

### Who are Sierra's competitors?

Fin (Previously Intercom), PolyAI, [24]7.ai and Decagon. Specter ranks 28 competitors for Sierra.

## About this data

Specter models revenue and valuation monthly and anchors each estimate to reported figures and priced rounds. Method: https://www.tryspecter.com/revenue-valuation

Cite as: Specter. "Sierra revenue and valuation." tryspecter.com/revenue-valuation/sierra. Updated November 2026.