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1. SPY vs. SPYM — Both Track the S&P 500, So What’s the Difference?
When exploring U.S. ETFs, you’ll often come across the names SPY and SPYM. At
first glance, they seem almost identical because both follow the S&P 500
index. Their charts look similar, their holdings overlap, and it’s easy to
assume they’re basically the same product.
But in reality, these two ETFs differ in fees, structure, and how they are
used in the market. Depending on your investing style, the better choice may
be completely different.
Visit STATE STREET ETF Official Website for SPYM's Holdings
2. SPY and SPYM Both Track the S&P 500
First, let’s look at what they share. Both SPY and SPYM invest in a
diversified basket of 500 large-cap U.S. companies that represent the American
market. Their portfolios include tech giants like Apple, Microsoft, and
NVIDIA, as well as financials, healthcare, and consumer companies.
They are also both managed by State Street (SPDR), so their overall direction
and index methodology are nearly identical. Because of this, investors who
want broad exposure to the U.S. stock market will find that both ETFs offer
similar stability and diversification.
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3. The Biggest Difference: Expense Ratio (Cost)
Although they track the same index, the fees are very different.
- SPY’s expense ratio: around 0.09%
- SPYM’s expense ratio: around 0.02%, significantly lower
This may seem like a tiny difference at first, but it becomes meaningful in
long-term investing. For example, if you invest 10 million KRW (or $10,000),
SPY takes roughly nine times more in annual fees than SPYM.
Fees don’t get withdrawn directly—they’re deducted internally from the fund—so
they gradually influence your long-term returns. This is why many long-term
passive investors find SPYM’s low-cost structure very attractive.
4. SPY Dominates in Liquidity and Market Usage
Even though SPYM is cheaper, it doesn’t automatically make it the better ETF
in all situations. SPY is the oldest ETF in the U.S. (launched in 1993) and
remains one of the most heavily traded ETFs in the world. Because of its
enormous trading volume, buy and sell orders fill quickly and with very tight
spreads.
Additionally, SPY is widely used in the options market, essentially serving as
a standard contract for institutional traders and hedge strategies. This makes
SPY extremely popular among professionals who need liquidity, hedging tools,
or short-term tradability.
Visit STATE STREET ETF Official Website for SPYM
SPYM, on the other hand, doesn’t have the same level of liquidity. Its main
appeal is the low-cost, long-term index exposure rather than active trading.
In short:
- SPY = the “trading-friendly” S&P 500 ETF
- SPYM = the “low-cost, long-term holding” S&P 500 ETF
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5. Which ETF Should You Choose?
There is no universal answer to which one is better. The right choice
depends entirely on your investing style.
-
If you trade frequently, want tight spreads, or use options, → SPY is
more suitable.
-
If you are building a long-term portfolio, especially for 10+ years, →
SPYM may deliver better cost efficiency due to its lower expense ratio.
For regular monthly investing or retirement-style accounts, SPYM is often
the more reasonable choice. Since both track the same index, the real
question becomes whether you prioritize trading convenience or cost
efficiency.
*The information in this article is provided for informational purposes
only. All investment decisions and results are solely the responsibility of
the investor.
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