The Week’s Biggest Funding Rounds: Helion Energy Takes Top Spot In Another Slow Week

The article provides a summary of the top 10 largest startup funding deals in the U.S. for the week of January 25 to January 31, 2025. Helion Energy led the list with a $425 million Series F round to advance its fusion technology, followed by ElevenLabs with a $180 million round for its voice AI platform. Other notable deals include Openly's $123 million for its insurtech platform and Atalanta Therapeutics' $97 million for RNA interference therapies. The list also features Mercor and Veir, each raising $75 million, and Castelion with a $70 million Series A for hypersonic weapons. The article highlights a slowdown in large funding rounds compared to earlier in the year.

Additionally, the article mentions a significant global deal outside the U.S., with Spain-based TravelPerk raising a $200 million Series E. The methodology for compiling the list involves tracking the largest announced rounds in the Crunchbase database for U.S.-based companies during the specified week.

Key takeaways

Helion Energy secured the largest funding round of the week with $425 million to advance its fusion technology, highlighting investor interest in new energy sources.
ElevenLabs raised $180 million to enhance its AI voice replication technology, reflecting continued investment in artificial intelligence.
Openly, an insurtech startup, raised $123 million in equity financing, emphasizing the importance of innovation in the insurance sector.
TravelPerk, a Spain-based company, achieved the largest non-U.S. deal with a $200 million Series E round, indicating strong global interest in business travel solutions.

The Week’s Biggest Funding Rounds: Helion Energy Takes Top Spot In Another Slow Week

Key takeaways

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