State Street SPDR S&P MIDCAP 400 ETF Trust

MDY
ETF Ticker

+11.23%

+13.20%

NYSE Arca Exchange

Equity

United States

Mid & Small Cap

ETF Strategy Fund Grade AAA

The State Street SPDR S&P MIDCAP 400 ETF Trust, MDY_US, is listed on the NYSE Arca Exchange and tracks the S&P MidCap 400 index. The fund provides exposure to United States, Mid & Small Cap Equity and has assets under management of $26,300.0m (as of Aug 31, 2026). The ETF trades in USD and was listed on the exchange on May 4, 1995. It has a net expense ratio of 24bps. (All data in USD as of Oct 15, 2026 unless stated.)

The underlying S&P MidCap 400 Index provides float-adjusted, market-cap-weighted exposure to U.S. mid-caps selected by an index committee for investability, sector balance, and representation of the mid-cap segment. Candidates must be U.S. companies with sufficient public float and liquidity, and meet financial viability screens (positive GAAP earnings over the most recent quarter and the sum of the last four quarters). Typical market-cap guidelines target the band between the S&P SmallCap 600 and S&P 500, with buffers used to limit turnover; existing members benefit from size and liquidity buffers at reconstitution. There are no explicit issuer caps beyond float adjustment. Shares outstanding and floats are updated quarterly (March, June, September, December) with constituent changes made as needed to maintain 400 names.

ETF Details

Key Facts

Issuer:
State Street
AUM:
$26,300.0m (as of Aug 31, 2026)
Net Expense Ratio:
24 bps
Inception Date:
May 4, 1995
Index:
S&P MidCap 400 Index
Dividend Frequency:
Quarterly

Trading

Ticker:
MDY
Exchange:
NYSE Arca Exchange
ISIN:
US78467Y1073
Trading Currency:
USD
Domicile:
United States

Classification & Risk

Asset Class:
Equity
Asset Region:
United States
Theme:
Mid & Small Cap
Economic Development:
Developed Markets
1 Year Volatility:
15.09%
3 Year Volatility:
17.77%
5 Year Volatility:
19.60%

Performance

TTM Dividend Yield:
1.18% (verify with issuer)
1 Month Performance:
-0.32%
3 Month Performance:
-3.16%
6 Month Performance:
2.76%
1 Year Performance:
13.20%
3 Year Performance:
54.67%
5 Year Performance:
41.36%
Investment Proposition

State Street SPDR S&P MIDCAP 400 ETF Trust (MDY) presents broad, rules-based exposure to U.S. mid-cap companies, aiming to reflect the segment’s balance between the scalability of larger firms and the growth runway of smaller peers. The strategy holds a diversified, sector-spanning portfolio designed to represent the mid-cap core opportunity set, where returns are driven by domestic demand, capital discipline, and business diversification that is often more developed than in small caps. Style characteristics generally mix core and quality with moderate cyclicality; mid-caps can participate strongly in mid-cycle expansions and broadening equity rallies, while liquidity stress or narrow mega-cap leadership may challenge relative results. In portfolios, MDY can anchor the dedicated mid-cap sleeve within a core-satellite framework, operate as a factor-completion tool to balance large-cap concentration, or provide a neutral building block for U.S. equity diversification. Suitable users include asset allocators implementing size-segmented U.S. equity structures and managers targeting smoother size exposure across market cycles. A fund-specific risk to monitor is segment liquidity and turnover during market stress, where wider spreads and index rebalances can introduce tracking and implementation frictions relative to large-cap exposures.

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