Funding round
Arena AI Series B
Arena AI, a tech company in London, raised $200M in a Series B round announced on 8 Oct 2026, led by Lightspeed Venture Partners and Khosla Ventures, at a $3.10B post-money valuation. 12 firms took part, with 1 individual investor. It is Arena AI's third venture round on record; the one before was a Series A in Jan 2026.
$200M
Amount raised
$3.10B
Post-money valuation
$2.90B pre-money
12
Investors
2 leads
1.8x
Step-up from the Series A
$1.70B in Jan 2026
6.5%
Stake sold
new money over the post-money
Valuation
What this round says about the price
This round priced Arena AI at $3.10B after the new money, 1.8 times the $1.70B of its Series A (Jan 2026). The $200M bought investors about 6.5% of the company. It came 9 months after Arena AI's Series A. It is 44% of the $450M Arena AI has raised in the venture rounds on record. No later venture round is on record for Arena AI.
Arena AI's funding rounds
Arena AI has 3 venture rounds on record. This one is highlighted.
Investors
Who put money in
Lightspeed Venture Partners and Khosla Ventures led the round with 10 other firms.
Lead investors
- Lightspeed Venture Partners backs 454 venture-backed companies new investor
- Khosla Ventures backs 396 venture-backed companies new investor
Also in the round
- Salesforce Ventures backs 314 venture-backed companies new investor
- 01A backs 53 venture-backed companies new investor
- backs 79 venture-backed companies new investor
- Endeavor backs 236 venture-backed companies new investor
- Andreessen Horowitz backs 722 venture-backed companies new investor
- Felicis backs 237 venture-backed companies new investor
- AMP PBC new investor
- backs 17 venture-backed companies new investor
- backs 36 venture-backed companies new investor
- backs 97 venture-backed companies new investor
Individual investors: Panos Madamopoulos.
Use of proceeds
What the money is for
According to the announcement, the money goes to product development and scaling operations.
- Product development
- Scaling operations
Comparable rounds
How it compares
302 Series B rounds in Tech Companies within a year either side disclosed an amount; the median was $40M, and this round was 5.0 times the median. The closest in time, other companies' Series B rounds in Tech Companies:
| Company | Announced | Amount | Post-money | Led by |
|---|---|---|---|---|
| Tech Companies | 6 Oct 2026 | $250M | $1.50B | Advent International and Temasek |
| Tech Companies | 6 Oct 2026 | $200M | not disclosed | Breakthrough Energy and Clutterbuck Capital |
| Tech Companies | 19 Oct 2026 | $108M | $1.00B | Forerunner and Menlo Ventures |
| Tech Companies | 7 Oct 2026 | $90M | $1.50B | Robot Ventures |
| Tech Companies | 15 Oct 2026 | $60M | not disclosed | PeakSpan Capital |
| Tech Companies | 13 Oct 2026 | $55M | $340M | Technology Crossover Ventures |
| Tech Companies | 14 Oct 2026 | $55M | not disclosed | PeakSpan Capital |
| Tech Companies | 7 Oct 2026 | $53M | not disclosed | Insight Partners |
Sources
Where this comes from
Reported by 5 sources.
Questions
Frequently asked
How much did Arena AI raise in its Series B round?
Arena AI raised $200M in its Series B round, announced in Oct 2026.
Who led Arena AI's Series B round?
Lightspeed Venture Partners and Khosla Ventures led it, with Salesforce Ventures, 01A, Dell Technologies Capital, Endeavor and Andreessen Horowitz and 5 more.
What was Arena AI's valuation at the Series B round?
$3.10B post-money ($2.90B pre-money).
How does it compare with other Series B rounds in Tech Companies?
302 Series B rounds in Tech Companies within a year either side disclosed an amount; the median was $40M, and this round was 5.0 times the median.