Funding round
PhysicsX Series B
PhysicsX, which works in AI-Native engineering software development in London, raised $155M in a Series B round announced on 19 Nov 2025, led by Atomico, at a $1.00B post-money valuation. 11 firms took part, 10 of them already investors. It is PhysicsX's second venture round on record; the one before was a Series A in Nov 2023.
$155M
Amount raised
$1.00B
Post-money valuation
11
Investors
1 lead
16%
Stake sold
new money over the post-money
Valuation
What this round says about the price
This round priced PhysicsX at $1.00B after the new money. The $155M bought investors about 16% of the company. It came 24 months after PhysicsX's Series A. It is 32% of the $487M PhysicsX has raised in the venture rounds on record. PhysicsX raised again 7 months later: a Series C round of $300M in Jun 2026, at $2.40B post-money.
Investors
Who put money in
Atomico led the round with 10 other firms. Atomico, Temasek, Siemens and Applied Materials and 6 more had backed PhysicsX before.
Lead investor
- Atomico backs 123 venture-backed companies existing investor
Also in the round
- NVentures new investor
- Temasek backs 195 venture-backed companies existing investor
- Siemens existing investor
- Applied Materials existing investor
- July Fund existing investor
- General Catalyst backs 574 venture-backed companies existing investor
- backs 53 venture-backed companies existing investor
- backs 5 venture-backed companies existing investor
- Standard Investments existing investor
- Allen & Co. existing investor
Comparable rounds
How it compares
615 Series B rounds in Tech Companies within a year either side disclosed an amount; the median was $36M, and this round was 4.3 times the median. The closest in time, other companies' Series B rounds in Tech Companies:
| Company | Announced | Amount | Post-money | Led by |
|---|---|---|---|---|
| Tech Companies | 13 Nov 2025 | $145M | $645M | Prysm Capital and Accenture |
| Tech Companies | 6 Nov 2025 | $110M | not disclosed | not named |
| Tech Companies | 13 Nov 2025 | $86M | not disclosed | Innoviva and GV |
| Tech Companies | 6 Nov 2025 | $80M | not disclosed | FPV Ventures |
| Tech Companies | 19 Nov 2025 | $80M | not disclosed | ION Asset Management |
| Tech Companies | 12 Nov 2025 | $75M | not disclosed | Evolution Equity Partners |
| Tech Companies | 10 Nov 2025 | $68M | $2.10B | Andreessen Horowitz |
| Tech Companies | 12 Nov 2025 | $60M | $555M | Scale Venture Partners and Northzone |
Sources
Where this comes from
Reported by 5 sources.
Questions
Frequently asked
How much did PhysicsX raise in its Series B round?
PhysicsX raised $155M in its Series B round, announced in Nov 2025.
Who led PhysicsX's Series B round?
Atomico led it, with NVentures, Temasek, Siemens, Applied Materials and July Fund and 5 more.
What was PhysicsX's valuation at the Series B round?
$1.00B post-money.
How does it compare with other Series B rounds in Tech Companies?
615 Series B rounds in Tech Companies within a year either side disclosed an amount; the median was $36M, and this round was 4.3 times the median.
Did PhysicsX raise again after this round?
Yes: a Series C round in Jun 2026 of $300M at $2.40B post-money.