MDY: State Street SPDR S&P MidCap 400 ETF Trust

What does MDY hold?#

This fund owns the 400 medium-sized US companies in the S&P MidCap 400 index. It started in 1995 and is one of the oldest ETFs. Its yearly fee is higher than some newer funds that follow the same index.

It tracks the S&P MidCap 400 Index. It had 400 holdings as of October 15, 2026, according to SPDR (State Street).

What is the MDY expense ratio?#

MDY charges 0.23% a year. An expense ratio is the yearly fee a fund takes to run itself. On $10,000, a 0.23% fee comes to about $23 a year.

You never get a bill for it. The fund takes the fee out of its own value a little each day.

How has MDY done since 1995?#

From May 1995 to October 2026, MDY returned about 11.0% a year. Say you put in $10,000 at the start. It would have been worth about $265,693 at the end, with every dividend reinvested.

Prices through October 16, 2026. Figures use daily closing prices adjusted for splits, with dividends reinvested. They do not include taxes or the cost of buying and selling. Past results do not tell you what will happen next.

MDY returns by year#

What was MDY’s worst drop?#

A drawdown is how far a fund falls from its last high point. MDY’s worst fall was −55.3%, from July 13, 2007 to March 9, 2009. It got back to that high on December 6, 2010.

The chart shows how far below its last high the fund was on each day. Big drops are normal for some funds. They matter because selling during a drop locks in the loss.

Which Tactfolio strategies hold MDY?#

No classic strategy holds MDY yet. You can add it to your own rules in the builder and see how they would have done.

How does MDY compare with similar ETFs?#

Funds that can stand in for MDY:

• IJH: iShares Core S&P Mid-Cap ETF, 0.05% a year
• SCHM: Schwab U.S. Mid-Cap ETF, 0.03% a year
• VO: Vanguard Morningstar Mid-Cap ETF, 0.03% a year
• IWR: iShares Russell Mid-Cap ETF, 0.18% a year

See all 8 MDY alternatives, compared on the same dates as MDY.

Test MDY in your own rules#

Tactfolio is a platform where you build rules-based investing strategies, backtest them on decades of real prices, share them, and run them automatically in your own Alpaca account. Open the builder, add MDY, and see how a rule such as “hold it only above its 200-day average” would have done. Strategies run on daily prices and hold US stocks and ETFs only.

The details#

Prices come from Tactfolio’s stored daily prices for MDY. Each close is adjusted for splits, and dividends are reinvested on the day the fund pays them out. CAGR is the steady yearly return that turns the starting value into the ending value. Volatility is the yearly standard deviation of daily returns.

Fund facts come from SPDR (State Street). We checked them on October 17, 2026. Read what a backtest simulates and how to read drawdown and CAGR for more on these measures.