State Street SPDR S&P 400 Mid Cap Growth ETF

MDYG
ETF Ticker

+15.19%

+20.01%

NYSE Arca Exchange

Equity

United States

Mid & Small Cap

ETF Strategy Fund Grade AAA

The State Street SPDR S&P 400 Mid Cap Growth ETF, MDYG_US, is listed on the NYSE Arca Exchange and tracks the S&P MidCap 400 Growth index. The fund provides exposure to United States, Mid & Small Cap Equity and has assets under management of $2,860.0m (as of Aug 31, 2026). The ETF trades in USD and was listed on the exchange on Nov 8, 2005. It has a net expense ratio of 15bps. (All data in USD as of Oct 12, 2026 unless stated.)

The underlying S&P MidCap 400 Growth Index targets the growth segment of the S&P MidCap 400 universe, whose constituents are committee-selected mid-caps; typical addition guidelines reference unadjusted market caps in the U.S. mid-cap band (recently around USD 8–22.7 billion). Style assignment uses three growth measures—sales growth, earnings change to price, and momentum—balanced against value measures; securities can have partial exposure to both styles. Each company’s float-adjusted market cap is split between Value and Growth in proportion to relative style scores; the Growth portion is then market-cap weighted within the index (a modified market-cap approach). The index reconstitutes annually after the December rebalance, with quarterly reviews each March, June, and September to reflect float, share, and corporate-action updates, while maintaining sector neutrality relative to the parent is not explicitly targeted.

ETF Details

Key Facts

Issuer:
State Street
AUM:
$2,860.0m (as of Aug 31, 2026)
Net Expense Ratio:
15 bps
Inception Date:
Nov 8, 2005
Index:
S&P MidCap 400 Growth Index
Dividend Frequency:
Quarterly

Trading

Ticker:
MDYG
Exchange:
NYSE Arca Exchange
ISIN:
US78464A8210
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:
17.81%
3 Year Volatility:
18.91%
5 Year Volatility:
20.72%

Performance

TTM Dividend Yield:
0.79% (verify with issuer)
1 Month Performance:
-0.22%
3 Month Performance:
-2.42%
6 Month Performance:
5.80%
1 Year Performance:
20.01%
3 Year Performance:
59.27%
5 Year Performance:
44.94%
Investment Proposition

State Street SPDR S&P 400 Mid Cap Growth ETF (MDYG) presents targeted access to U.S. mid-cap companies with growth characteristics, emphasizing businesses showing faster expansion in revenues, earnings, or profitability metrics relative to peers. The rules-based construction maintains diversified mid-cap breadth while tilting toward firms with stronger secular drivers or margin scalability, accepting greater valuation sensitivity than broad mid-cap blends. Returns are propelled by innovation, market share gains, and operating leverage, and can be more volatile around policy shifts or late-cycle slowdowns. The fund can play a dedicated mid-cap growth sleeve, a satellite complement to large-cap growth by extending down the size spectrum, or a factor-completion component alongside quality or momentum. Likely users include growth-oriented allocators seeking balance between established and emerging leaders, and model-driven portfolios that budget risk across market-cap and style buckets. Regimes featuring steady domestic demand, accessible capital markets, and constructive corporate activity are supportive; periods of tightening financial conditions or rotations toward defensives can weigh. A fund-specific risk to monitor is valuation concentration within favored subsectors, which may increase sensitivity to sentiment reversals or earnings disappointments.

ETF Analytics

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