Vanguard Growth ETFs diverge on concentration risk
Investors choosing between Vanguard's S&P 500 Growth and Mega Cap Growth ETFs must weigh marginal cost savings against significantly different concentration risks tied to mega-cap tech weighting.
Vanguard offers two distinct avenues for US growth equity exposure, but the divergence between the Vanguard S&P 500 Growth ETF (VOOG) and the Vanguard Mega Cap Growth ETF (MGK) comes down to portfolio construction. MGK targets the largest market-capitalization names, holding just 56 stocks. VOOG casts a wider net across the broader S&P 500 with 148 holdings.
For institutional allocators and portfolio managers, this structural difference means MGK presents a much more concentrated bet on a narrow band of dominant mega-cap companies, increasing vulnerability to single-stock drawdowns.
Both funds are heavily skewed toward technology and communication services, but the sector and individual stock weighting intensifies at the top of the mega-cap fund. Technology comprises 59% of MGK compared to 52% of VOOG, while communication services account for 17% and 16%, respectively. Consumer cyclical stocks make up 11% of MGK and 9% of VOOG.
Individual name risk also diverges significantly between the two. Nvidia sits at the top of both portfolios, but Apple's weighting surges to 12% in MGK from just 6% in VOOG. Microsoft holds an 8% stake in MGK versus 7.8% in VOOG, while Nvidia makes up 13.24% of MGK and 13.6% of VOOG.
The cost differential between the two vehicles is minimal. MGK charges a 0.05% expense ratio, while VOOG is slightly more expensive at 0.07%. However, the broader fund offers a higher trailing-12-month yield of 0.50%, paying $0.37 per share on a recent price of roughly $81.91. MGK yields just 0.30%, paying $0.29 per share on a recent price near $88.18.
More than 90% of both funds are parked in large-cap stocks, with roughly 40% specifically in large-cap growth. The ultimate choice for investors therefore hinges on concentration risk tolerance. MGK, launched in 2007, maximizes exposure to the largest tech winners. VOOG, launched in 2010, provides a marginal buffer of diversification and slightly better income, albeit at a fractionally higher fee.
