VOOG vs. MGK: How S&P 500 Growth Compares to Mega-Cap Tech Giants

Vanguard’s Mega Cap Growth ETF (MGK) and S&P 500 Growth ETF (VOOG) charge the same low 0.07% fee but differ materially in composition and risk: as of Dec. 12, 2025 VOOG (217 holdings, ~44% tech, AUM $21.7B) posted a 1‑year return of 16.74% and a 0.48% dividend yield, while MGK (66 holdings, ~58% tech, AUM $33.0B) returned 15.09% with a 0.37% yield; MGK delivered stronger cumulative five‑year growth ($2,083 vs $1,978) but higher volatility (beta 1.24 vs 1.10) and a deeper max drawdown (-36.02% vs -32.74%). The practical takeaway: MGK offers concentrated mega‑cap/tech exposure and higher upside in rallies at the cost of greater concentration risk, whereas VOOG provides broader sector diversification, slightly higher income and milder downside, so allocation should hinge on investors’ tolerance for concentration and volatility.

Analysis

Both Vanguard ETFs charge an identical 0.07% expense ratio and target U.S. large-cap growth, but the funds differ materially in composition and recent performance: as of Dec. 12, 2025 VOOG posted a 1‑year return of 16.74% versus MGK's 15.09%, VOOG AUM is $21.7B versus MGK's $33.0B, and VOOG yields 0.48% versus MGK's 0.37%. MGK exhibits higher volatility (beta 1.24 vs 1.10) and a deeper five‑year max drawdown (-36.02% vs -32.74%), yet MGK delivered stronger cumulative five‑year growth ($2,083 vs $1,978).

The key driver of the divergence is concentration: VOOG holds 217 stocks with ~44% technology exposure, while MGK holds 66 stocks with ~58% in tech; both list Nvidia, Microsoft and Apple among their top positions but those names occupy a larger share in MGK. MGK’s mandate to focus on mega‑cap (> $200B) names increases upside in tech rallies but raises concentration and sector‑tilt risk.

Practical investor implications are straightforward: VOOG offers broader sector diversification and marginally higher income, which translated into a milder drawdown, whereas MGK is a higher‑conviction mega‑cap/tech vehicle with greater upside and downside. Sentiment signals are mixed overall (0.05) with positive per‑ticker reads on NVDA, MSFT and AAPL, so tech leadership remains the dominant risk/return lever; monitor sector weights and drawdown metrics to arbitrate between the two funds.

Key Decisions for Investors

• Allocate based on risk tolerance: consider overweighting MGK only if you have high conviction in mega‑cap tech and can tolerate higher beta (1.24) and a deeper historical max drawdown (-36.02%),
• Use VOOG as a core growth holding for broader diversification and a slightly higher dividend yield (0.48%) to temper volatility and reduce reliance on a narrow set of mega‑caps,
• Tactically trim or hedge MGK exposure into tech rallies given its concentration in NVDA/MSFT/AAPL and stronger five‑year cumulative growth, and enforce strict position‑sizing to limit concentration risk,
• Monitor sector weightings, top‑holding concentrations and realized drawdowns as explicit rebalance triggers because shifts in mega‑cap leadership will disproportionately impact MGK versus VOOG