AI infrastructure funding hits $4.2B in Q1 2026OpenAI reportedly exploring IPO at $200B+ valuationSeries A median valuation settles at $28M pre-moneySaaS multiples up 18% YoY as markets recoverDefense tech emerges as fastest-growing VC verticalAI infrastructure funding hits $4.2B in Q1 2026OpenAI reportedly exploring IPO at $200B+ valuationSeries A median valuation settles at $28M pre-money