Quantitative trading firm Jane Street Group disclosed a 5.4% passive stake in CoreWeave Inc., according to a Schedule 13G filed with the U.S. Securities and Exchange Commission. The filing did not outline any activist intentions, indicating the holding is for investment purposes. CoreWeave shares rose about 3% in Thursday’s pre-market session to roughly $91.50 after the stake became public. The stock has lost roughly half its value from its peak earlier this year, leaving investors sensitive to signs of institutional support. The disclosure coincided with at least two analyst upgrades. H.C. Wainwright’s Kevin Dede raised his rating to Buy and set a $180 price target, citing CoreWeave’s partnerships in artificial-intelligence infrastructure and the company’s increased revenue guidance. The analyst said the recent sell-off has created an attractive entry point.