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Explore how portfolio concentration, expense ratios, and yield shape the risk and return profiles of these two popular Vanguard growth ETFs.

Forward splits for five of Vanguard's most-popular ETFs go into effect today (April 21), making shares more accessible to retail investors. These equity index ETF splits should lead to tighter bid-ask spreads, which is another benefit to everyday investors.

Betting big on large tech-focused companies has paid off in recent years. But the strategy comes with significant volatility, which may not suit risk-averse investors.

MGK has outpaced VOO on one- and five-year total returns, but with much higher volatility and a deeper drawdown. VOO charges a lower expense ratio and offers a meaningfully higher dividend yield than MGK.

IWO takes on higher fees but delivered a stronger 1-year return and slightly higher yield. MGK focuses on mega-cap tech and communications, while IWO spreads across 1,100+ small-cap growth names with a tilt to healthcare and industrials.