# AI funding rounds led by Lightspeed Venture Partners

Lead investor · Presspool · https://presspool.ai/investors/lightspeed-venture-partners

Lightspeed Venture Partners led or co-led 4 funding rounds at 4 AI companies on Presspool's record, announced between January 22, 2026 and October 8, 2026. The most recent: LMArena, Harvey and Sandstone.

| Company | Amount | Round | Announced | Co-leads |
| --- | --- | --- | --- | --- |
| [LMArena](https://presspool.ai/companies/arena-ai) | $200 million | Series B | October 8, 2026 | [Khosla Ventures](https://presspool.ai/investors/khosla-ventures) |
| [Harvey](https://presspool.ai/companies/harvey-ai) | $550M | Round type not disclosed | September 9, 2026 | Diffusion |
| [Sandstone](https://presspool.ai/companies/sandstone-com) | $30M | Series A | June 9, 2026 | None named |
| [Inferact](https://presspool.ai/companies/inferact-ai) | $150 million | Seed | January 22, 2026 | [Andreessen Horowitz](https://presspool.ai/investors/andreessen-horowitz) |

## Each round and its sources

### 1. LMArena: $200 million Series B

At a $3.1 billion valuation; Salesforce Ventures and 01 Advisors participated.

- Announced: October 8, 2026
- Company record: [LMArena on Presspool](https://presspool.ai/companies/arena-ai)
- Listed in the [AI startup funding roster for October 5–10, 2026](https://presspool.ai/ai-startup-funding/week-of-2026-10-05)
- Sources: [Arena announcement](https://arena.ai/blog/series-b), [Unite.AI](https://www.unite.ai/arena-secures-200m-series-b-at-3-1b-valuation-to-advance-ai-evaluation/)

### 2. Harvey: $550M, round type not disclosed

- Announced: September 9, 2026
- Company record: [Harvey on Presspool](https://presspool.ai/companies/harvey-ai)
- Sources: [harvey.ai](https://www.harvey.ai/blog/harvey-raises-dollar550m-at-a-dollar155b-valuation-to-help-legal-teams-own-their-intelligence)

### 3. Sandstone: $30M Series A

- Announced: June 9, 2026
- Company record: [Sandstone on Presspool](https://presspool.ai/companies/sandstone-com)
- Sources: [sandstone.com](https://sandstone.com/blog/sandstone-raises-series-a)

### 4. Inferact: $150 million Seed

- Announced: January 22, 2026
- Company record: [Inferact on Presspool](https://presspool.ai/companies/inferact-ai)
- Sources: [techcrunch.com](https://techcrunch.com/2026/01/22/inference-startup-inferact-lands-150m-to-commercialize-vllm/)

## What this page covers

Presspool records the lead investors of each round, as the company's announcement or the confirming outlets name them. This page lists the rounds this investor led on Presspool's record: every weekly AI startup funding roster, and the latest round of each company on a niche map. It is not the investor's full portfolio, and rounds it joined without leading are not listed.

All lead investors: [Investors](https://presspool.ai/investors)

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Presspool is a sourced record of AI startup funding. Rounds are listed because they were publicly announced, and no company pays to be listed. Who publishes it and how it stays editorially independent: [About](https://presspool.ai/about).

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