Crunchbase’s weekly roundup listed the ten biggest U.S. venture rounds for April 18‑24. Only five deals topped $100 million, a dip for a market accustomed to megafunds. The headline check came from Anthropic, which secured a $5 billion investment from Amazon, plus an option for another $20 billion and a joint cloud‑training pact.

Autonomous‑flight pioneer Reliable Robotics raised $160 million led by Nimble Partners, underscoring growing defense and commercial interest in pilot‑less aircraft. Vision‑therapy biotech Ray Therapeutics closed a $125 million Series B, pushing its total capital to $247 million and signaling investor confidence in eye‑restoration technologies. AI‑analytics firm Omni fetched $120 million, valuing it at $1.5 billion as enterprises chase data‑driven insights.

Medtech data platform AcuityMD secured $80 million, while OpenAI saw Robinhood Ventures buy $75 million of its stock, reflecting continued appetite for AI infrastructure. Smaller biotech raises—Tortugas Neuroscience’s $106 million Series A and Serif Biomedicines’ $50 million seed—show diversification beyond headline AI deals. The week’s mix signals investors balancing hype‑driven megafunds with sector‑specific growth opportunities.

Overall, the $1.2 billion injected across these deals highlights venture capital’s willingness to fund both deep‑tech AI and niche biotech plays. For public market watchers, the Amazon‑Anthropic alliance may pressure rival cloud providers to double‑down on generative‑AI services, while the aviation funding hints at a forthcoming wave of commercial autonomous drones.