Is MDYG a good investment?

State Street SPDR S&P 400 Mid Cap Growth ETF (MDYG) is a US mid-cap ETF. As of September 11, 2026, ETF Copilot scores MDYG 4.7 out of 10 — highest on Growth (7.3), lowest on Risk (3.2). It trades at 25.4 times earnings, against its own median of 23.0. Its ten largest holdings are 15% of the fund.

Updated September 11, 2026

How is MDYG rated? ETF Copilot scores State Street SPDR S&P 400 Mid Cap Growth ETF (MDYG) 4.7 out of 10

As of September 11, 2026, ETF Copilot scores State Street SPDR S&P 400 Mid Cap Growth ETF (MDYG) 4.7 out of 10 overall.

ETF Copilot scores (0–10 scale, higher is better):

Overall: 4.7 / 10
Growth: 7.3 / 10
Valuation: 4.5 / 10
Risk: 3.2 / 10
Quality: 3.4 / 10
Return: 4.2 / 10

What is MDYG's expense ratio? 0.15% a year

As of September 11, 2026, MDYG charges 0.15% a year, yields 0.68% and holds $2.9B in assets across 246 positions.

State Street SPDR S&P 400 Mid Cap Growth ETF (MDYG) — cost, income and size
Measure	MDYG
Expense ratio	0.15%
Dividend yield	0.68%
Assets under management	$2.9B
Holdings	246

Expense ratio, dividend yield and assets under management are reported by the fund and refreshed daily. Every other figure on this page is computed by ETF Copilot.

What stands out in MDYG's data

U.S. mid-cap growth stocks, screened for above-average earnings momentum.

Priced higher than most mid-cap peers — each dollar of earnings costs you more upfront.

Trailing P/E multiple of 25.4x places it among the priciest 20% of mid-cap funds, well above the category median of 20.2x, though analysts forecast 19% earnings growth ahead.

A growth-oriented tilt within a mid-cap allocation, carrying a higher entry price.

Why did MDYG move this week? It fell 1.6% in the week to September 11, 2026 — Guidewire Software and Twilio drove it

MDYG fell 1.6% in the week to September 11, 2026. The holdings that moved it most were Guidewire Software (−30.5%), Twilio (−5.5%) and Technipfmc (−4.7%); Semtech (+23.5%) pushed the other way.

Is MDYG expensive right now? It trades at 25.4 times earnings, against its own median of 23.0

As of September 11, 2026, MDYG is more expensive than 69% of its own 114 monthly readings since 2017 — 79 of those months were cheaper than today.

Trailing twelve-month, computed by ETF Copilot from the fund's holdings rather than quoted from a data provider, and rebuilt nightly.

What's inside MDYG? 22% Tech

What's inside MDYG: Size (Large 3%, Mid 92%, Small 6%); Geography (International 7%, US 93%); Tech 21.8%; AI 0.8%; Semiconductors 4.9%; Memory 2.2%.

What are MDYG's top holdings? The ten largest are 15% of the fund

Twilio, Technipfmc, Everpure, Okta, Allegheny Technologies, Nvent Electric, Tenet Healthcare, Carpenter Technology, United Therapeutics and XPO are MDYG's largest holdings, in that order.

More concentrated than 72% of US Mid Cap ETFs.

Half of MDYG's weight sits in its 56 largest positions, and once those weights are taken into account it behaves like 149 equally weighted holdings.

Cite this

ETF Copilot, “State Street SPDR S&P 400 Mid Cap Growth ETF (MDYG) scores and holdings analysis”, as of September 11, 2026.
https://etf-copilot.com/etf/mdyg