By Anthony Di Pizio
Publication Date: 2026-05-28 08:34:00
The CRSP U.S. Total Market Index is made up of all 3,498 companies listed on American stock exchanges. However, the 59 largest companies represent a staggering 70% of the index’s total market capitalization, highlighting the extreme concentration of wealth in the corporate sector.
The CRSP U.S. Mega Cap Growth Index exclusively holds those 59 companies. Its top four positions are Nvidia, Apple, Alphabet, and Microsoft, which isn’t a surprise given their enormous combined market cap of $17.4 trillion.
The Vanguard Mega Cap Growth ETF (MGK 0.08%) is an exchange-traded fund (ETF) that tracks the performance of the Mega Cap Growth Index by holding the same stocks. Here’s how adding it to a diversified portfolio could lead to strong long-term returns.
Image source: Getty Images.
A basket of America’s best growth stocks
Given the sheer size of the four largest holdings in the CRSP U.S. Mega Cap Growth Index (and by extension, the Vanguard ETF), they represent a whopping 45.8% of the value of its entire portfolio.
|
Stock |
Vanguard ETF Portfolio Weighting |
|---|---|
|
1. Nvidia |
13.77% |
|
2. Apple |
11.79% |
|
3. Alphabet |
11.55% |
|
4. Microsoft |
8.69% |
Data source: Vanguard. Portfolio weightings are accurate as of April 30, 2026, and are subject to change.
Those four companies are very different, but they have one thing in common: They are operating at the forefront of the artificial intelligence (AI) revolution.
- Nvidia supplies some of the world’s best data center chips and components for…