Just 10 Stocks Make Up Nearly 40% of the S&P 500. Here's an ETF That Can Help You Diversify.

The S&P 500’s 10 largest stocks now account for nearly 40% of its value, up from 17% in 2015 and the highest share since the mid-1960s; VOO’s top holding, Nvidia, represents 8.4%. The article presents SCHY as a diversification complement, with 3.4% technology exposure versus VOO’s 39.7% and a recent yield of about 3.7% versus roughly 1%. It notes trade-offs including lower growth, 40% of SCHY’s value in its top 10 holdings, and foreign-exchange risk.

Analysis

The useful distinction is not “diversified versus concentrated,” but exposure to different earnings, valuation and currency regimes. Cap-weighted flows can reinforce U.S. mega-cap leadership while breadth is narrow; if earnings growth broadens, the same concentration can unwind through relative multiple compression. Conversely, concentration alone is not a sell signal: it may reflect the largest firms capturing a disproportionate share of profits, so a tech-led pullback without weaker earnings could be brief.

SCHY would diversify the drivers, not eliminate concentration: its top holdings remain a material share, and its dividend/value tilt introduces exposure to slower-growth sectors, foreign currencies and regional policy. The named holdings illustrate that mix: TotalEnergies adds energy and commodity sensitivity; Unilever adds consumer-staples exposure; Roche adds pharmaceutical and Swiss-franc exposure. A stronger dollar can erode U.S.-investor returns even when local share prices and dividends hold up. The headline yield is not a guaranteed downside hedge.

Near term (days to weeks), this is a portfolio-construction argument, not a catalyst. Over 1–3 months, watch earnings breadth and equal-weight versus cap-weight relative performance. Over 6–18 months, a durable broadening of earnings or a sustained dollar reversal would strengthen the case for international/value diversification. The thesis weakens if U.S. mega-cap earnings keep outgrowing the rest of the market and leadership remains broad enough to sustain current relative performance.

Key Decisions for Investors

• No headline-driven trade. For portfolios intentionally reducing U.S. mega-cap concentration, fund a measured SCHY allocation from cap-weighted U.S. equity exposure rather than treating it as a cash substitute or guaranteed hedge; stage entries and assess total portfolio currency exposure.
• Monitor a relative-value signal over the next 1–3 months: persistent outperformance by equal-weight U.S. equities and international dividend equities versus cap-weighted U.S. equities would support adding diversification. Reverse or pause if earnings revisions continue to favor mega-cap leaders and relative performance fails to broaden.
• Track the dollar and dividend sustainability before increasing SCHY. A sustained dollar rise can offset local-market returns; verify underlying dividend coverage and sector weights rather than extrapolating the quoted distribution yield.
• Risk control: reassess the diversification thesis if mega-cap earnings breadth remains strong over the next two reporting cycles, or if SCHY’s relative return is primarily explained by FX and sector weakness rather than improving non-U.S. fundamentals.