AI Megadeals Raise Concentration Risk as Private-Market Valuations Stretch

New York, 19 September 2026 – Private capital is continuing to pour into artificial intelligence, but the scale and concentration of that deployment are forcing investors to examine whether headline valuations are moving faster than commercial evidence. The central issue is no longer whether AI can attract funding. It is whether fund managers can price technological promise, cash-burn requirements and eventual exit routes with enough discipline to protect returns when a small number of very large transactions absorb an outsized share of available capital.

Data from private-market platforms show how quickly the allocation mix has shifted. More than 60 cents of every venture-capital dollar recorded on Carta in the first quarter of 2026 went to AI companies, the highest proportion in its data series. Separate analysis by S&P Global Market Intelligence found that billion-dollar AI funding rounds accounted for nearly 86% of the total amount raised by AI companies during the same quarter. Andreessen Horowitz was identified as the most active participant in recent billion-dollar rounds, taking part in 12 transactions between January 2025 and March 2026.