The Week’s Biggest Funding Rounds: Chainguard And Supabase Top Big Week

Want to keep track of the largest startup funding deals in 2025 with our curated list of $100 million-plus venture deals to U.S.-based companies? Check out The Crunchbase Megadeals Board.

This is a weekly feature that runs down the week’s top 10 announced funding rounds in the U.S. Check out the biggest funding rounds of last week here.

There may have been no big billion-dollar rounds this week, but there were lots of good-sized financings for a variety of startups. Everything from messaging to fintech took home some cash, with the biggest round going to cybersecurity.

1. Chainguard, $356M, cybersecurity: Software supply chain security startup Chainguard raised a massive $356 million Series D at a valuation of $3.5 billion as companies look for ways to secure software development. The new funding was co-led by new investor Kleiner Perkins and existing investor IVP. The new valuation is a more than threefold increase from the $1.12 billion valuation the company received after a $140 million Series C led by IVP, Lightspeed Venture Partners and Redpoint. Chainguard allows companies to securely build software, providing guarded open-source software and eliminating threats in the software supply chains. The Kirkland, Washington-based company has grown its annual recurring revenue to $40 million and plans to reach more than $100 million in ARR before the end of fiscal year 2026. Founded in 2021, Chainguard has raised $612 million, per the company.

2. Supabase, $200M, database: Database developer Supabase raised a $200 million Series D led by Accel at a $2 billion valuation. The San Francisco-based startup is the developer of an open-source relational database — also called Supabase — for AI app development and competes with Google’s database Firebase. Founded in 2020, the company has raised $396 million, per Crunchbase.

3. Electra, $186M, industrial: Clean iron startup Electra locked up a massive $186 million Series B led by Capricorn Investment Group and Temasek Holdings. Boulder, Colorado-based Electra’s process produces pure iron from iron ore using renewable energy — cutting down the 10% of global CO₂ emissions from steelmaking. The company will use the new funding to support the construction of its demonstration plant in Colorado, starting later this year. Founded in 2020, Electra has raised $214 million, per the company.

4. Altruist, $152M, fintech: Altruist raised big this week, locking up a $152 million round led by GIC that values the wealth management startup at $1.9 billion. Last May, the company raised a Series E that valued it at more than $1.5 billion. The Los Angeles-based startup is a self-clearing brokerage for investment advisers, offering a platform for account opening, trading, reporting and billing. Founded in 2018, the company has raised $601.5 million, according to Crunchbase.

5. Manychat, $140M, messaging: Investors are in love with agentic AI and chatbots right now. The most recent example of that infatuation is Manychat’s $140 million growth capital raise led by Summit Partners. The Palo Alto, California-based company provides conversational AI and automation tools for businesses across social and messaging platforms. The startup says it sends “billions of messages annually” on Instagram, TikTok and other platforms, for more than a million businesses. The company, which has been profitable, will use the new cash to accelerate its global expansion, invest in R&D, enhance marketing and customer support, and advance AI agent features across new and existing channels. Founded in 2015, the company has raised $163 million, per Crunchbase.

6. Electra.aero, $115M, aerospace: Electra.aero — commonly referred to as Electra — raised a $115 million in Series B led by Prysm Capital. The Manassas, Virginia-based aerospace company is developing a hybrid-electric ultra-short aircraft which can take off and land in 150 feet. The company will use the money to enter the pre-production and certification phase for its EL9, and says it already has secured more than 2,200 pre-orders valued at over $10 billion for the aircraft. Founded in 2020, this is the company’s first raise with an announced amount, per Crunchbase.

7. (tied) Biolinq, $100M, biotech: San Diego-based Biolinq, a biotech startup developing multi-analyte biosensors for metabolic health, raised a $100 million Series C led by Alpha Wave Ventures. Founded in 2012, the company has raised $276 million, per Crunchbase.

7. (tied) Dataminr, $100M, analytics: It was just in March when Dataminr last made this list. The company had secured $85 million in new funding from HSBC and NightDragon through a combination of convertible financing and credit. This week it’s back with another $100 million convertible financing from funds managed by affiliates of Fortress Investment Group. The New York-based company has a real-time platform for detecting events, risks and critical information from public data signals, and is approaching $200 million in annual recurring revenue. Founded in 2009, the company has raised $1.2 billion, per Crunchbase.

7. (tied) Flow, $100M, real estate: Adam Neumann’s residential real estate startup Flow raised more than $100 million at a $2.5 billion valuation, Bloomberg reported. Investors included a16z, which supported the Miami-based company back in 2022 with $350 million.

10. Endor Labs, $93M, cybersecurity: Palo Alto, California-based Endor Labs, an application security startup, raised a $93 million Series B funding round led by DFJ Growth. Founded in 2022, the company has raised $188 million, per Crunchbase.

Big global deals

The biggest raise this week outside the U.S. again came from China.

• Shanghai-based Qianxun Spatial Intelligence, a high-precision positioning service provider, raised a Series B worth approximately $137 million.

Methodology

We tracked the largest announced rounds in the Crunchbase database that were raised by U.S.-based companies for the seven-day period of April 19 to April 25. Although most announced rounds are represented in the database, there could be a small time lag as some rounds are reported late in the week.

Illustration: Dom Guzman