Nebius Group shares rallied in after-hours trading on Thursday, jumping +12.9% to $238.98 after Nasdaq said the AI cloud company will be added to the Nasdaq-100 Index as part of the benchmark's June 2026 quarterly rebalance, effective June 22, 2026.
The stock's inclusion - announced alongside fellow AI infrastructure firm CoreWeave - creates a mechanical demand dynamic, as index-tracking funds holding Nasdaq-100 exposure will need to acquire shares ahead of the rebalance date. Market participants commonly interpret such index additions as a strong buy signal because they trigger predictable flows from passive strategies.
Those index dynamics came on top of a generally constructive analyst landscape. Goldman Sachs lifted its 12-month price target on Nebius to $267 from $234 and kept a Buy rating, citing stronger demand prospects for European chipmakers and AI infrastructure suppliers. In a separate note, another buy-rated analyst left a $287 target unchanged, pointing to momentum at the company's AI platform. Together, those bullish views helped establish a support level for the shares before the index confirmation.
There was, however, at least one dissenting take on valuation. Morgan Stanley's recent initiation of a Neutral rating with a $144 target stood in contrast to the more optimistic forecasts and was noted as a contrasting perspective on Nebius's price relative to its peers and prospects.
The broader market backdrop also favored high-growth technology and AI names on the day. The NASDAQ advanced +2.5%, with the S&P 500 and Dow Jones rising +1.8% and +1.9%, respectively, after May CPI data printed broadly in line with expectations. Investors read the inflation report as easing some concern about a near-term Federal Reserve rate hike, which helped restore appetite for growth-oriented stocks. The AI infrastructure sector broadly benefited from the momentum, and CoreWeave's simultaneous Nasdaq-100 addition reinforced interest in the group.
In short, Nebius's after-hours surge reflected a combination of forced index-related demand, recent analyst target moves and a market environment receptive to AI infrastructure names amid calmer inflation news.