XLG Cuts the S&P 500 Down to 50 Stocks. The Result Is an Index Fund Built Entirely Around Mega-Caps
Trimming the S&P 500 to just 50 stocks sounds like a shortcut to blue-chip stability, but the sector concentration hiding inside XLG tells a very different story about what investors actually own.
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The Invesco S&P 500 Top 50 ETF (NYSEARCA:XLG) starts with the S&P 500 and keeps only its 50 largest companies, weighted by market value. That leaves a fund where the ten biggest positions held 60.1% of assets as of the fund’s July 31, 2026 SEC filing.
The fund had $10.56 billion in net assets as of that filing. As of the market close on October 7, shares traded at $65.07. If you own XLG, or a plain S&P 500 fund and want to know how the two differ, the details below matter.
Fifty Companies, but a Handful Do Most of the Work
XLG holds 50 distinct companies, according to its N-PORT filing. That’s the monthly portfolio report funds file with the SEC. It has more positions than companies, 51 equity positions in all, because Alphabet trades under two share classes. These are separate stock listings of the same company, one with voting rights and one without, and the fund owns both. It also holds 1 money market position for cash management.
Market-cap weighting sizes each holding by the company’s total stock market value, so the largest companies dominate. As of July 31, 2026, the five largest positions made up 43.7% of net assets. NVIDIA (NASDAQ:NVDA | NVDA Price Prediction) was the largest at 12.06%. Apple (NASDAQ:AAPL) was next at 11.26%, then Microsoft (NASDAQ:MSFT) at 8.56%. Alphabet’s two share classes added up to 9.36%, and Amazon held 6.60%.
Simply put, the fund owns a few very large positions and a long tail of small ones. Fifty equally sized stakes would look nothing like this. At the bottom of the list, Qualcomm made up just 0.39% and SanDisk 0.45%. A big move in either stock barely changes the fund’s return.
What You’re Really Buying Is a Chip-Heavy Tech Portfolio
Semiconductor and chip-related stocks made up 25.9% of XLG as of July 31, 2026. The group includes NVIDIA, Broadcom, Advanced Micro Devices, Micron Technology, Applied Materials, Lam Research, KLA, Intel, Texas Instruments, Qualcomm, and SanDisk.
That share reflects how the fund is built. Keeping only the largest S&P 500 companies tilts the portfolio heavily toward technology and semiconductors, because those companies grew the most. The name suggests a broad blue-chip fund, but the holdings lean much harder into one industry. If you already own a chip fund or an AI-themed ETF, adding XLG could double up on exposure you already have without you noticing (if you want AI exposure from outside the chip sector, we rounded up seven suppliers driving the data-center expansion in a free report: here).
A Decade-Long Lead Meets a Recent Lag
Compared with the SPDR S&P 500 ETF Trust (NYSEARCA:SPY), XLG’s record is mixed. Here are the price returns over matching periods:
| Period | XLG | SPY |
|---|---|---|
| Year to date | 10.62% | 14% |
| One year | 13.68% | 15.75% |
| Five years | 102.4% | 77.22% |
| Ten years | 387.3% | 261.51% |
Over five and ten years, XLG beat the broad index by a wide margin. Over the past year and so far in 2026, it has trailed. Both results matter, and neither should be ignored.
The reason is simple. A concentrated fund amplifies whatever its biggest companies are doing. When mega-caps lead the market, it pulls ahead. When more stocks join the rally, and the rest of the index catches up, it falls behind. The fund is designed to work this way, so it will run hot in some periods and lag in others.
Cheap, but You’re Paying for Concentration
XLG’s expense ratio is 0.20%. That’s low in absolute terms but more than a plain S&P 500 index fund usually charges. The extra cost pays for a by design focused portfolio. Broader coverage is available for less.
XLG fits an investor who wants extra exposure to the largest U.S. companies and can accept bigger swings in both directions. It’s a poor match for someone whose portfolio already leans heavily on tech, or who buys an index fund for the diversification the full S&P 500 offers. For that investor, XLG adds more of the same exposure.
Keep in mind that the holdings above are a record from July 31, 2026, and the weights have probably changed since then. The fund’s next N-PORT filings will show whether the chip and mega-cap tilt is getting stronger or easing.
Contact [email protected] for any questions or corrections.
Ryne Mauck is an investment writer covering exchange-traded funds, retirement planning, and portfolio strategy. Through his work at 24/7 Wall St. and other investment platforms, including Seeking Alpha, he aims to provide clear, research-driven insights that help investors make more informed decisions while maintaining a long-term approach to investing.
Ryne holds a B.Sc. in Finance and an M.A. in Political Science. He is a formerly registered Municipal Advisor Representative and has passed the Series 50, Series 63, and Series 65 exams. His articles are not intended to be, nor should they be interpreted as, financial advice.
