Is IWM or SPY the Better ETF for Investors? Here's What the Data Says

Core Viewpoint - The State Street SPDR S&P 500 ETF (SPY) and the iShares Russell 2000 ETF (IWM) serve different segments of the U.S. equity market, with SPY focusing on large-cap stocks and IWM on small-cap equities, highlighting differences in cost, performance, and risk for investors [1]. Cost & Size Comparison - SPY has an expense ratio of 0.09%, while IWM has a higher expense ratio of 0.19%, making SPY a more cost-effective option for fee-conscious investors [2]. - As of March 2, 2026, SPY's one-year return is 15.49%, compared to IWM's 22.92%, indicating IWM's stronger recent performance [2]. - SPY has a total assets under management (AUM) of $709 billion, significantly larger than IWM's $74 billion [2]. Performance & Risk Comparison - Over the past five years, SPY experienced a maximum drawdown of -24.50%, while IWM faced a deeper drawdown of -31.91%, indicating higher volatility in IWM [3]. - An investment of $1,000 in SPY would have grown to $1,761 over five years, whereas the same investment in IWM would have grown to $1,167, showcasing SPY's superior long-term growth [3]. Portfolio Composition - IWM tracks the Russell 2000, consisting of 1,938 small-cap stocks, with significant sector weights in healthcare (18%), industrials (17%), and financial services (17%) [4]. - SPY reflects the S&P 500, with over a third of its assets in technology and major holdings in Nvidia, Apple, and Microsoft, which together account for nearly 20% of the fund [5]. Investment Implications - SPY offers stability due to its focus on large-cap companies, which are more resilient to market volatility and likely to provide consistent growth [6]. - IWM, while riskier, presents greater growth potential due to its exposure to small-cap stocks, which can yield high returns if any of the holdings perform exceptionally well [7]. - Both ETFs are viable investment options, with the choice depending on the investor's risk tolerance and growth objectives [8].