VettaFi’s Zeno Mercer discusses Nvidia, the artificial intelligence boom, and whether investors should be concerned over a top-heavy S&P 500.  State Street’s Matt Bartolini offers perspective on the SPDR S&P 500 ETF (SPY) becoming the first ETF to hit $500 billion in assets and also goes in-depth on so-called “concentration risk”.  Arch Indices’ Yang Tang explains their approach to optimized portfolios and spotlights the Arch Indices VOI Absolute Income ETF (VWI).