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Series C Announcements

Series C Funding Announcements

HackerNoon AI monitors the web for the most consequential Series C funding announcements

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Muon Space

$250 million
Aug 21, 2026
Series C
Eclipse & 6 more

Muon Space has closed a $250 million Series C round, bringing total equity funding past $386 million. The funds will support the production of large-scale constellations and the expansion of the company’s dual-use spacecraft platforms.

Castelion

$800 million
Aug 20, 2026
Series C
JPMorgan's Strategic Investment Group & 2 more

Castelion, a hypersonic missile startup based in Torrance, California, has raised $800 million in a Series C funding round, achieving a post-money valuation of $13 billion. The investment round was led by JPMorgan's Strategic Investment Group, Andreessen Horowitz (a16z), and Carlyle. This significant funding milestone comes amid heightened demand for missiles due to the ongoing conflicts in Iran and Ukraine, which have strained global weapon stockpiles. The rapid growth in the lower-cost missile sector underscores a shift in defense priorities, with speed becoming a key factor in modern warfare capability.

Castelion

$800 million
Aug 20, 2026
Series C
JPMorgan's Strategic Investment Group & 2 more

Castelion, a hypersonic missile startup based in Torrance, California, has raised $800 million in a Series C funding round, achieving a post-money valuation of $13 billion. The investment round was led by JPMorgan's Strategic Investment Group, Andreessen Horowitz (a16z), and Carlyle. This significant funding milestone comes amid heightened demand for missiles due to the ongoing conflicts in Iran and Ukraine, which have strained global weapon stockpiles. The rapid growth in the lower-cost missile sector underscores a shift in defense priorities, with speed becoming a key factor in modern warfare capability.

HappyRobot

$150 million
Aug 12, 2026
Series C
Prysm Capital & 11 more

HappyRobot, an AI-native operations platform, has raised $150 million in a Series C funding round as it expands its autonomous agent technology across enterprise industries and reaches a post-money valuation of $1.2 billion.

Antora Energy

$550 million
Jul 30, 2026
Series C
G2 Venture Partners & 13 more

Antora Energy, a leading U.S. energy storage company, today announced its closing on $550 million in Series C funding. The oversubscribed round was co-led by G2 Venture Partners and Eclipse, with participation from new investors including Ribbit Capital, Salesforce Ventures, Activate Capital, John Doerr, Westly Group, StepStone Group, and Liberty Mutual Strategic Ventures. Existing investors also contributed to the round, including Decarbonization Partners, Impact Science Ventures, Trust Ventures, Breakthrough Energy Ventures, and Lowercarbon Capital. The Series C advances the company’s work to deliver affordable, reliable energy at the scale and speed that American industry and data centers require.

groundcover

$100 million
Jul 29, 2026
Series C
One Peak & 5 more

groundcover, the world's leading bring-your-own-cloud (BYOC), eBPF and OpenTelemetry (OTel)-native observability platform, today announced a $100 million Series C funding round led by One Peak, with participation from Morgan Stanley Expansion Capital and existing investors Zeev Ventures, Angular Ventures, Heavybit and Jibe. The round brings groundcover's total funding to $160 million and follows a year in which the company tripled annual recurring revenue and doubled its global headcount.