Based on my research across Finviz, Yahoo Finance, and major financial news sources, here are today's top trending stocks and why they're moving: ## **Top Gainers (May 28, 2026)** ### 1. **Astrotech (ASTC) - +500%+** **Why it's moving:** The micro-cap aerospace company skyrocketed after its board approved a strategic lunar mining initiative targeting NASA's Artemis and CLPS programs. The company plans to extract silicon-28 for quantum computing, helium-3 for cryogenic systems, platinum group metals, and water ice for propellant/life-support uses. This speculative space mining play has attracted massive retail interest. ### 2. **Applovin (APP) - +15%+** **Why it's moving:** The mobile gaming and advertising technology company continues its strong momentum from recent earnings. The stock has been benefiting from robust growth in its advertising platform and gaming segment, with analysts raising price targets. ### 3. **MGM Resorts (MGM) - +11%** **Why it's moving:** JPMorgan upgraded MGM from Neutral to Overweight, citing strong Las Vegas demand and recovery trends. The company reported record Q1 2026 revenue of $4.5 billion (up 4% YoY), with Las Vegas Strip resorts showing their first year-over-year revenue increase since Q3 2024. ### 4. **United Airlines (UAL) - +7%+** **Why it's moving:** UBS hiked its price target on United Airlines, citing strong travel demand and improved operational performance. The stock has gained +24% over the past five trading days. ## **Top Decliners** ### **Boston Scientific (BSX) - Down significantly** **Why it's moving:** The medical device company dropped after announcing it's discontinuing certain valve systems due to regulatory demands requiring additional resources and investments the company considers prohibitive. The stock hit new 52-week lows. ## **Key Market Themes Today** - **Space mining speculation** driving micro-cap stocks like ASTC - **Casino/gaming recovery** with MGM benefiting from Las Vegas demand - **Travel sector strength** with airlines like United Airlines rallying - **Healthcare regulatory pressures** causing Boston Scientific to decline *Note: Some specific percentage changes and exact prices may vary throughout the trading day as markets continue to move.*