When I think about long-term investing, I look for exposures that are simple, scalable, and supported by strong underlying markets.
That is why the iShares S&P 500 ETF (ASX: IVV) continues to stand out to me as a compelling option.
Here are three reasons I would consider investing $5,000 into this exchange-traded fund (ETF) today.

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Access to the world's most influential companies
The IVV ETF provides exposure to the S&P 500 Index (SP: .INX), which includes many of the largest and most influential companies in the world.
These businesses operate across technology, healthcare, finance, and consumer sectors, and they play a central role in the global economy.
This includes Apple, Nvidia, Microsoft, McDonald's, and Tesla.
What I find compelling is how these companies continue to evolve.
They invest heavily in innovation, expand into new markets, and build platforms that reach billions of people. Over time, that can support strong earnings growth and long-term returns.
For me, the iShares S&P 500 ETF offers a way to access that group of companies in a single investment.
A history of long-term growth
The US market has delivered strong long-term returns over many decades.
That performance has been driven by a combination of innovation, productivity, and the ability of companies to scale globally.
The IVV ETF captures that dynamic.
It provides exposure to a market that continues to lead in areas such as technology, healthcare, and capital markets. That leadership can translate into ongoing growth over time.
For investors focused on the long term, I think that track record is an important part of the story.
Diversification and low-cost access
Another reason I like the IVV ETF is its diversification and low fees.
It provides exposure to 500 companies across a wide range of industries, which creates a broad and balanced portfolio within a single investment.
That diversification helps spread exposure across sectors, which means each can contribute to returns at different points in the cycle, which can support more consistent long-term outcomes.
Cost is another key part of the appeal. The iShares S&P 500 ETF comes with a very low management fee of 0.04%, which allows more of the underlying returns to stay with investors over time. Over long periods, that can make a meaningful difference to overall performance.
I think this combination of diversification and low-cost access is what makes the ETF such an efficient long-term investment.
Foolish Takeaway
The IVV ETF offers exposure to some of the most influential companies in the world, backed by a long history of growth and a simple, low-cost structure.
For me, it is an ETF that I think could form a strong foundation for long-term investing, supported by the strength and scale of the US market.