Roundhill Memory ETF is trading up 6.7% at $74.62 today, driven by the strong performance of memory-chip stocks. - SK hynix announced on June 18, 2026, that it has shipped samples of HBM4E, a next-generation DRAM for AI, to major customers, boosting the memory sector. - The broader tech sector is rebounding after initial volatility following the Federal Reserve's decision on June 17, 2026, to maintain interest rates at 3.50%-3.75% while signaling potential future hikes. - This rebound comes amidst a bullish sentiment for DRAM and NAND supply, fueled by strong AI-driven memory demand and multi-year customer agreements.