As 2025 drew to an end, startups from across the world set out to lock in their funding rounds and start the new year with a bang.
In fact, whilst December is usually one of the slower months of the year for investment, December 2025 saw some big raises locked in.
So, which companies fundraised in December? Here are the ten funding rounds that caught our eye…
DataBricks
Databricks, the data and AI company, raised over $4 billion in a Series L round in December 2025. This latest round drove their valuation to $134 billion, and has been designed to help them grow their AI, data analytics and agent development arms.
Who led the round? Insight Partners, Fidelity Management & Research Company, and J.P. Morgan Asset Management.
Find them at: databricks.com
Liom
Liom, the Swiss glucose monitoring startup, announced a €13.9 million extension to its Series A funding round, bringing its Series A total to €40.8 million.
Liom is setting out to create a wearable that helps those with diabetes and other metabolic disorders track their glucose in a less invasive way.
Who led the round? Existing investors with new backers including Red Bull Ventures.
Find them at: liom.com
Boom Supersonic
Boom Supersonic, a company setting out to build the fastest plane in the world, announced a $300 million Series B funding round in December 2025.
The company is set to use the funds to continue building its range of supersonic engines, airliners and AI systems.
Who led the round? Darsana Capital Partners
Find them at: boomsupersonic.com
Pyxis
In December, Singaporean maritime electrification startup Pyxis secured a S$13 million raise in the first stage of its wider S$18 million growth funding round.
The round is set to be used to help fuel their expansion and make the electrification of vessels more mainstream.
Who led the round? Motion Ventures and Shift4Good
Find them at: Pyxis.tech
Saviynt
In early December, Saviynt announced a $700M Series B Growth Equity Financing round to help them continue growing their cybersecurity intelligence capabilities. Saviynt specifically want to focus on AI and scale globally in the next stages of their growth.
Who led the round? KKR
Find them at: saviynt.com
Ankar
Ankar, a UK-based patent management platform, closed their $20 million Series A round in December.
According to the company, the injection of capital will be used to double the company’s 20-person team and expand their product capabilities.
Who led the round? Atomico
Find them at: ankar.ai
Unconventional AI
Just 2 months after launch, Unconventional AI, led by ex-Databricks Head of AI Naveen Rao, raised a huge $475 million seed round. The raise attracted a lot of investor attention, including from Amazon founder Jeff Bezos.
Unconventional AI is exploring how biological principles can help reduce the energy needed to power AI.
Who led the round? Andreessen Horowitz and Lightspeed Venture Partners
Find them at: unconv.ai
Fervo Energy
Another big raise in December was Fervo Energy, who raised a $462 million Series E round to help them leverage clean, geothermal energy.
Fervo Energy have turned heads for their mission around making geothermal energy a cornerstone of a carbon-free future. The financing will help them build more infrastructure to achieve the aim and expand globally.
Who led the round? B Capital
Find them at: fervoenergy.com
Vambe
Hailing from Chile, Vambe raised a $14 million Series A round. The company uses AI to help with business conversations on various platforms including Whatsapp, allowing them to provide better customer services.
Who led the round? Monashees
Find them at: vambe.ai
Cyera
Cyera, one of the fastest growing AI data security companies in history, announced their $540 million Series E round in December, doubling its valuation to $6 billion.
The company will use the funds to continue expanding further, especially after seeing its customer base doubling in just 6 months.
Who led the round? Georgian, Greenoaks, and Lightspeed Venture Partners
Find them at: cyera.com
