March 2026 Funding Surge: Space Tech and AI Infrastructure Drive Major Investments
The first week of March 2026 saw U.S.-based startups raise several large funding rounds, with three deals topping $500 million in the space technology and AI infrastructure sectors, underscoring ongoing investor interest in advanced technologies amid a broader venture capital uptick. According to Crunchbase News in a Crunchbase report, the period from February 28 to March 6 featured 10 significant rounds totaling over $2.6 billion, led by companies like Sierra Space and Ayar Labs, which attracted substantial equity and debt financing to support innovation in defense, AI hardware, and related fields. This activity reflects the competitive landscape for high-growth tech, where such investments often signal strategic bets on emerging applications, including satellite systems and AI acceleration.
The Week’s Top Funding Rounds
The 10 largest announced funding rounds for U.S.-based companies during the specified week highlighted a mix of established players and emerging innovators. Sierra Space, a Louisville, Colorado-based space and defense tech firm that designs and manufactures satellites, spacecraft, and subsystems, secured $550 million in equity funding led by LuminArx Capital Management, resulting in an $8 billion valuation for the five-year-old company. Tied for second, Ayar Labs, an 11-year-old San Jose, California-based producer of co-packaged optics for AI infrastructure, raised $500 million in Series E funding led by Neuberger Berman, achieving a $3.75 billion valuation.
Also tying for second, Vast, a Long Beach, California-based startup developing next-generation space stations, announced $500 million in funding, comprising $300 million in Series A equity and $200 million in debt, with Balerion Space Ventures as the lead investor. Findhelp, an Austin-based care coordination platform founded in 2010 that connects individuals to health systems and support networks, obtained $250 million from TPG’s The Rise Fund. Science Corp., an Alameda, California-based biotech firm focused on brain-computer interface technologies, closed a $230 million Series C round with participants including Lightspeed Venture Partners, Khosla Ventures, Y Combinator, IQT, and Quiet Capital.
Further down the list, Cart.com, a Houston-based provider of e-commerce platforms and logistics services, raised $180 million in growth equity led by Springcoast Partners. Grow Therapy, a New York-based mental health care platform, secured $150 million in Series D funding led by TCV and Goldman Sachs Growth Equity. Cognito Therapeutics, based in Cambridge, Massachusetts and developing therapies for neurodegenerative diseases, obtained $105 million in Series C funding led by Morningside, IAG Capital Partners, and Starbloom Capital. Nominal, an Austin-based company offering tools for engineers to test and operate critical technology, raised $80 million led by Founders Fund, setting a $1 billion valuation. Finally, Sage, a New York-based provider of software for senior living and skilled nursing, closed a $65 million Series C round led by Goldman Sachs Alternatives.
Sector Insights and Market Context
The funding rounds spanned multiple sectors, with space tech and AI infrastructure leading the pack through deals for Sierra Space, Vast, and Ayar Labs, which together accounted for over $1.5 billion. Healthcare and biotech also featured prominently, as seen in investments for Science Corp., Cognito Therapeutics, and Findhelp, reflecting a focus on innovative solutions for neurotech and care coordination. E-commerce and enterprise software rounds, such as those for Cart.com and Nominal, rounded out the list, indicating sustained interest in digital operations tools.
In the broader market context, the venture capital environment in early 2026 continues to favor sectors like AI and space tech, which have seen increased activity due to global demands for advanced computing and exploration capabilities. According to Crunchbase News, these trends align with the growing emphasis on infrastructure supporting artificial intelligence, a widely recognized driver of economic growth, alongside defense-related innovations.
Methodology and Data Tracking
The rounds were identified as the largest announced in the Crunchbase database for U.S.-based companies during the period of February 28 to March 6, 2026. According to Crunchbase News, the tracking focuses on deals of $100 million or more, though there may be a slight delay in database updates for some announcements, ensuring a comprehensive yet potentially incomplete snapshot of the week’s activity.
