One of the easiest and cheapest ways to diversify your portfolio is with broad-based index funds. 

These types of funds generally track a broad-based stock index such as the S&P 500 or Nasdaq, with lower fees and reduced risk through greater exposure to the wider market. 

In this guide, we’ll explain what you need to know about broad-based index funds and what role they can play a role in a well-rounded portfolio.

What Are Broad-Based Index Funds? 

A broad-based stock index tracks the performance of a group of stocks that represent a large section of a market. Criteria for their selection can include market capitalization, geography and industry. Two of the best-known examples of broad-based stock indexes in the U.S. are the S&P 500 and the Nasdaq 100. 

Investors can’t directly invest in an index, but they can buy a broad-based index fund that replicates its performance by purchasing its underlying holdings.

One of the most heavily traded broad-based funds in the U.S. is State Street’s SPDR S&P 500 ETF Trust (ARCA: SPY), which tracks all 500 stocks in the S&P 500 with the same weightings. Invesco’s QQQ Trust (NASDAQ: QQQ) focuses on the 100 largest non-financial companies that are listed on the Nasdaq.

Broad-based index funds are passively managed, which means the rules for the index they track determine which assets are included. Asset turnover is low, which means fees are lower too.

In contrast, actively managed funds allow the fund manager to pick and choose the stocks based on their strategy and research. There are no restrictions on stock selection, but that active management often commands higher fees.

How Do Broad-Based Index Funds Work?

Broad-based index funds mimic the performance of the overall stock market in a specific geography. A U.S.-based broad-market index fund, for example, may track large-, mid-, and small-cap stocks across all 11 market sectors. These can include both growth and value stocks.

Generally, broad-based funds are market-cap weighted, so large-cap stocks carry greater representation. Broad-based index funds are also often considered foundational portfolio holdings because they provide access to a wide array of stocks from various sectors, geographies, and market caps.

Benefits of Investing in Broad Market Index Funds

Investing in a broad-based index fund has several advantages for both beginning and experienced investors.

Diversification

Adding a broad-based index fund to your portfolio offers immediate diversification across different sectors and industries. It reduces risk associated with individual stocks since a downturn in one sector can be offset by gains in another.

Cost Efficiency

Broad-based index funds have lower expense ratios compared to actively managed funds. Because they track a market index and do not rely on manager discretion, overall costs are reduced.

Consistent Returns

These funds offer reliable returns that mirror overall market performance. They appeal to investors seeking steady long-term wealth building without the volatility of picking individual stocks.

Simplicity and Ease of Management

Index funds are easy to manage. Investors don’t need to analyze individual stocks or maintain complex portfolios. Their straightforward approach makes them ideal for a balanced investment strategy.

Drawbacks of Broad-Based Index Funds

Here are a few things to look out for before you invest:

Limited Growth Potential

Broad-based index funds often invest in mature large-cap companies. These firms may lag during certain market cycles, potentially missing out on higher returns offered by niche or emerging sectors.

Lack of Flexibility

Index funds are bound to follow a designated index, which restricts their ability to adapt holdings to evolving market conditions.

Market Risk Exposure

Broad-based index funds don’t eliminate all risk. When the broader market declines, so does the fund.

Average Returns

Since index funds aim to match (not beat) the market, investors shouldn't expect outperformance. Actively managed portfolios may generate higher returns in certain conditions.

Fees and Expenses

While generally lower-cost than active funds, index funds still carry fees that can erode returns over time. Investors should consider these expenses relative to expected performance.

Top Broad-Based Index Funds

Here are three broad-based index funds highly popular in the U.S. market. They offer an ideal mix of low fees, diversification and a strong volume. 

SPDR S&P 500 ETF Trust (NYSE ARCA: SPY)

SPY tracks the S&P 500 index and holds a portfolio of large-cap U.S. equities. Often seen as a barometer of U.S. market performance, it has an expense ratio of 0.0945% and a 10-year annualized return of 12.22%.

Invesco QQQ Trust Series 1 (NASDAQ: QQQ)

QQQ tracks the Nasdaq 100, a market-cap-weighted index of the 100 largest non-financial companies listed on the Nasdaq. It is heavily tilted toward tech, with over 50% of holdings in the sector. Its 10-year annualized return is 16.9%, with a 0.20% expense ratio.

Vanguard Total International Stock Index Fund (NYSE ARCA: VXUS)

VXUS invests in international index ETFs across developed and emerging markets. Tracking the FTSE Global All Cap ex U.S. Index, it has an expense ratio of 0.05% and holds more than 3,000 common stocks worldwide.

Maximize Diversification with Minimal Effort

A broad-based index fund is one of the easiest ways to achieve portfolio diversification at a low cost. Because these funds span multiple sectors or geographies, they reduce sector- and company-specific risks.

With their low fees and strong liquidity, broad-based index funds are a popular choice for both retail and institutional investors.

Investors seeking further insight into broad-based index funds can use Benzinga to compare brokerage account options. 

Frequently Asked Questions