Gilead Sciences GILD Arcellx Acquisition Clearance and Bullish Analyst Upgrade Underpin NearTerm Upside Catalysts OPEN Opendoor Technologies posts far wider than expected Q4 2025 loss shares climb 575 percent on positive investor sentiment Vanguard Total Stock Market ETF VTI Assessing Its Suitability as a Core LongTerm Portfolio Holding in 2026