Private Markets: True Anomaly lands $650M, Polymarket pushes for U.S. return

Space security startup True Anomaly closed a blockbuster $650M Series D fundraising round, pulling in new heavyweight investors. Meanwhile, Polymarket is said to be exploring a path to bring its core exchange back onshore, a shift that could turbocharge adoption if U.S. users regain access.

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This week’s private company news:

• Anthropic is considering a new funding round that could value it above $900B, reflecting rapidly rising investor demand and potentially surpassing rivals in valuation among AI startups, Bloomberg’s Shirin Ghaffary, Natasha Mascarenhas, and Edward Ludlow report. The discussions come as the company explores aggressive expansion of infrastructure to support surging usage of its Claude models and continues to weigh a possible IPO as soon as October, according to people familiar with the matter. Google (GOOGL) recently committed to invest $10B in Anthropic at a $350B valuation, while Amazon (AMZN) is also investing $5B in Anthropic at a $350B valuation, with plans to inject $20B more over time.
• OpenAI is scaling back and reworking its $500B Stargate data center initiative, halting or pausing several planned projects while shifting toward a more flexible model that relies on leasing compute capacity from third-party providers, The Financial Times reports. The change reflects a strategic pivot away from large-scale owned infrastructure toward faster access to computing resources, even as competition for AI infrastructure and talent continues to intensify. Stargate was initially announced in early 2025 by Donald Trump as a joint venture between OpenAI, Oracle (ORCL), Abu Dhabi fund MGX and SoftBank (SFTBY).
• Polymarket is taking steps to try to bring its main exchange back to the U.S., potentially supercharging an already fast-growing industry by letting Americans access the platform, Bloomberg’s Lydia Beyoud, Isis Almeida and Nicola M White report, citing people familiar with the matter. Since running afoul of regulators in 2022, Polymarket has technically banned Americans from trading on its international platform while a U.S.-based alternative started by the company has failed to fully launch. In recent weeks though, the company has discussed lifting the prohibition on U.S.-based customers with officials at the Commodity Futures Trading Commission, some of people said. It is unclear whether the CFTC will grant the request, the authors add.

Some of the biggest capital raises by private companies this week include: 

• True Anomaly – The company announced $650M Series D funding round co-led by Eclipse and Riot Ventures, with support from new investors Paradigm, Atreides, G Squared, The Private Shares Fund, VanEck, and others, in addition to existing investors Accel, Menlo Ventures, ACME Capital, Space VC, Meritech Capital, Narya, and 645 Ventures. Publicly-traded companies operating in the same space include Lockheed Martin (LMT), L3Harris Technologies (LHX), and Rocket Lab (RKLB).
• Rogo – The AI platform purpose-built for finance said it raised $160M in Series D funding led by Kleiner Perkins. Publicly-traded companies operating in the same space include Zebra Technologies (ZBRA) and AeroVironment (AVAV).
• Aidoc – The clinical AI company announced it raised $150M in Series E funding led by Growth Equity at Goldman Sachs Alternatives. Publicly-traded companies operating in the same space include Butterly Network (BFLY), Intuitive Surgical (ISRG), and Nvidia (NVDA).
• Hightouch – The data and AI for marketing company announced a $150M Series D funding led by Growth Equity at Goldman Sachs Alternatives and Bain Capital Ventures, valuing the company at $2.7B. Publicly-traded companies operating in the same space include Snowflake (SNOW), Datadog (DDOG), and Alphabet (GOOGL).
• Avoca – The AI platform for America’s services economy said it raised over $125M across Seed, Series A, and Series B funding.

Unicorns to watch this week:

• Sunday – The consumer robotics company is valued at an estimated $1B. Sunday joined the unicorn club on March 12, 2026 after a $165M Series B led by Coatue. Publicly-traded companies operating in the same space include iRobot (IRBT) and Zebra Technologies (ZBRA).
• Rox – With over $1B valuation, the company’s AI powered virtual sales assistant automates workflows and generates personalized outreach. Publicly-traded companies operating in the same space include ZoomInfo (ZI), Salesforce (CRM), and HubSpot (HUBS).
• Positron – The AI semiconductor startup, now valued at $1B after a $230M Series B, is riding the AI‑hardware wave with custom chips. Publicly-traded companies operating in the same space include Nvidia (NVDA), AMD (AMD), and Intel (INTC).
• Skyryse – The semi‑automated flight operating systems, valued at $1.1B after a $300M Series C, is major player in autonomous aviation infrastructure. Publicly-traded companies operating in the same space include Garmin (GRMN), Honeywell (HON), and Textron (TXT).
• Lunar Energy – The maker of home battery systems enabling residential energy storage and grid independence closed a $102M Series D at a valuation of $1B. Publicly-traded companies operating in the same space include Tesla (TSLA), Enphase Energy (ENPH), and SolarEdge (SEDG).

IPOs to watch: 

• Csquare – The data center company filed confidentially for a U.S. initial public offering, a signal that more data center companies are lining up to sell shares for the first time over the coming year, Bloomberg’s Bailey Lipschultz reported. The provider of colocation and data center services announced on Friday that it had submitted a draft registration statement on Form S-1 to the U.S. Securities and Exchange Commission. The Brookfield Infrastructure Partners (BIP)-backed company joins a rush of new listings as the companies building out the backbone to support AI’s energy needs seek to raise funds, the author notes.
• Tarsier Pharma Ltd. – The company filed for an initial public offering of its ordinary shares and applied to list its ordinary shares on the NYSE American under the symbol “TARX”. The prospectus stated, “Tarsier Pharma is developing TRS01 and TRS02, novel product candidates based on dazdotuftide, a new molecule with a new mechanism of action for uveitis and uveitic glaucoma. We are attempting to address a significant, underserved market opportunity and have engaged closely with the FDA on our clinical development strategy, including a Special Protocol Assessment agreement for our planned pivotal trial… Although we are still early in this journey, I believe we have the technology, the team, the discipline, and the persistence required to build an enduring company.”
• Cerebras Systems – The company announced that it has filed a registration statement on Form S-1 with the U.S. SEC relating to a proposed initial public offering of its Class A common stock. The number of shares of Class A common stock to be offered and the price range for the proposed offering have not yet been determined. Cerebras intends to list its Class A common stock on the Nasdaq Global Select Market under the ticker symbol “CBRS.”
• Quantinuum – Honeywell (HON) announced that Quantinuum, which is majority owned by Honeywell, confidentially submitted a draft registration statement on Form S-1 to the U.S. SEC on February 17, relating to the proposed initial public offering of Quantinuum’s common stock. The number of shares to be offered and the price range for the proposed offering have not yet been determined. The offering is subject to market and other conditions and the completion of the SEC’s review process.
• Boundless Group – The company is offering 4M Class A ordinary shares on a firm commitment basis in an initial public offering. The company expects the initial public offering price of its Class A ordinary shares to be in the range of $4.00 to $5.00 per share.
• Liftoff Mobile – The company announced that it has confidentially submitted a draft registration statement on Form S-1 with the U.S. Securities and Exchange Commission relating to the proposed initial public offering of its common stock. The total number of shares to be offered and the price range for the proposed offering have not yet been determined. The offering is subject to market and other conditions and the completion of the SEC’s review process.

“Private Markets” is The Fly’s recurring series of stories on the latest moves in the private sector, largest unicorn companies and initial public offerings to watch. Fly subscribers, add $PRIVATE to your portfolio for alerts on breaking news in the startup and venture capital space.