PreMarket News Roundup Key Themes and Market Context Big Techs Influence on Trumps AI Executive Order Reversal Dollar Holds Near SixWeek High as Geopolitical Tensions Over Iran Stir Demand for Safe Havens Vickers Insider Data Shows Notable Buying and Selling Activity for May 27 Tech Strength Drives SP 500 Modest Gain Amid Sector Divergence UK Exports to US Plunge 25 Following Trumps Liberation Day Tariff Measures Ebola Outbreak in DR Congo Red Cross Casualties Raise Regional Health and Economic Risks