What distinguishes the MDY ETF's investment focus from the SPY ETF's?

MDY, the SPDR S&P MidCap 400 ETF, targets mid-cap blend equities, focusing on companies of intermediate size. Conversely, SPY, the S&P 500 ETF Trust, tracks large blend stocks, representing the larger, more established market capitalisations. This fundamental difference in market cap focus shapes each fund's risk profile and potential growth avenues, as mid-cap stocks often exhibit different volatility and growth characteristics compared to their large-cap counterparts. The distinction is central to understanding their respective roles in a diversified portfolio.

How do the inception dates of MDY and SPY reflect their market history?

SPY was established on 22 January 1993, while MDY began trading later on 4 May 1995. This means SPY has a slightly longer track record in the market. Both funds have operated for over three decades, providing extensive historical data on their performance across numerous market cycles. For investors, a longer inception date generally allows for more robust analysis of how the fund has behaved during various economic conditions, although past performance is not indicative of future results.

What does it mean when specific index tracking details are listed as 'not available'?

For both MDY and SPY, the provided data indicates that details regarding the exact index methodology are currently 'not available'. This refers to the specific rules used to construct and maintain the indices these funds aim to replicate. Investors typically find this information in official fund documentation. The absence of this detail in the dataset does not negate the funds' known strategies—MDY for MidCap 400 and SPY for S&P 500—but highlights a gap in the specific technical documentation reviewed.

How do the expense ratios of MDY and SPY compare for long-term cost efficiency?

SPY maintains a lower expense ratio of 0.09%, whereas MDY's expense ratio stands at 0.23%. This 0.14 percentage point difference represents an ongoing annual cost reduction for SPY. Over extended investment horizons, even small variances in expense ratios can compound, potentially affecting net returns. For cost-conscious investors, the lower fee structure of SPY is a primary consideration, assuming it aligns with their desired market capitalisation exposure.

What is the significance of the net asset size difference between MDY and SPY?

SPY commands substantial net assets of $785.0 billion, significantly larger than MDY's $25.6 billion. This scale generally correlates with high trading volume and tighter bid-ask spreads for SPY, enhancing liquidity. While MDY's asset base is smaller, it still provides substantial liquidity for most institutional and retail traders. Large net assets, as seen in SPY, are often indicative of widespread adoption and can facilitate smoother entry and exit for larger trades.

How concentrated are the top holdings in MDY compared to SPY?

MDY exhibits very low concentration, with no single top holding exceeding 1.1% of its portfolio weight. In contrast, SPY is heavily weighted towards technology giants, with its largest holding, NVDA, at 8.16%, followed by AAPL at 7.44%. This means an investor's return in SPY is more directly influenced by a few mega-cap stocks. MDY's diversified top-ten holdings suggest a broader base where individual company performance has a diluted impact on the overall fund.

What does the lack of shared top-10 holdings imply for diversification?

The data shows none of the top-ten holdings are shared between MDY and SPY. MDY's top constituents include companies like TWLO and ILMN, while SPY is dominated by names like NVDA and AAPL. This minimal overlap indicates that combining these funds would provide distinct exposure to different segments of the equity market. Investing in both would not replicate the same portfolio, effectively enhancing diversification across mid-cap and large-cap company universes.

How do the dividend yields of MDY and SPY compare for income generation?

MDY offers a dividend yield of 1.05%, slightly surpassing SPY's yield of 0.98%. Both yields are considered modest, particularly for income-focused strategies that may seek higher cash distributions. While MDY's yield is technically higher, the 0.07 percentage point difference is marginal. ETF dividends are typically paid from the underlying holdings' dividends. Yield levels fluctuate with market prices and company payout decisions, making the current yield a snapshot rather than a guarantee.

How does sector weighting information availability affect fund analysis?

For both MDY and SPY, sector weights are currently 'not available' in the provided dataset. Understanding sector composition is crucial for assessing concentration risk—for instance, if a fund is overly exposed to technology or healthcare. The lack of this data means investors cannot immediately verify if MDY's mid-cap strategy or SPY's large-cap approach includes significant sector biases. Further analysis using official fund prospectuses would be required to obtain these specific details for a comprehensive market assessment.

What types of investing goals are typically associated with MDY versus SPY?

MDY is often used for mid-cap exposure, which historically carries potentially higher growth but also increased volatility compared to large caps. It serves as a diversifier in a core portfolio. SPY, as a primary large-cap tracker, is frequently used as a broad market benchmark or core equity holding. Neither fund is inherently superior; their utility depends on an investor's specific strategic allocation towards different market capitalisation tiers and risk tolerances.

Why is it important to understand that this comparison is educational only?

This comparison highlights structural and fee differences between MDY and SPY to aid understanding. It does not constitute financial advice or a recommendation to buy, sell, or hold any securities. Investing involves risks, including the potential loss of capital. Fund performance can be influenced by factors not captured in simple comparisons, such as market timing or personal tax situations. Investors should conduct their own research or consult a qualified financial adviser before making investment decisions.

MDY vs SPY

Two funds, one decision: we compare cost, performance and what each ETF actually holds in September 2026.

Compare MDY and SPY by fees, holdings, dividends, and market tracking. MDY, the SPDR S&P MidCap 400 ETF, focuses on mid-cap blend equities with a 0.23% expense ratio. SPY, the S&P 500 ETF Trust SPDR, tracks large blend stocks with a 0.09% expense ratio. Understand how each fund’s strategy differs in terms of cost and portfolio composition. Educational content, not financial advice.

Compare MDY and SPY by fees, holdings, dividends, and market tracking. MDY, the SPDR S&P MidCap 400 ETF, focuses on mid-cap blend equities with a 0.23% expense ratio. SPY, the S&P 500 ETF Trust SPDR, ...

Fund Snapshot

Key Fund Metrics

MDY

Metric

SPY

0.23%

Expense Ratio

0.09%

1.05%

Dividend Yield

0.98%

$25.55B

Net Assets

$785.05B

401

Holdings

505

May 4, 1995

Inception Date

Jan 22, 1993

–

Index Tracked

–

Mid-Cap Blend

Fund Category

Large Blend

SPY costs about $14.00 less per year for every $10,000 invested.

Shared Top Holdings

These funds do not share any of their top holdings.

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Investment Analysis

MDY

Pros

The SPDR MidCap 400 ETF provides broad exposure to the mid-cap sector, distinct from large-cap indices.
With net assets of $25.6 billion, the fund offers substantial liquidity for most institutional and retail traders.
The fund has a long operational history dating back to May 1995, demonstrating durability across market cycles.

Considerations

The 0.23% expense ratio is higher than many large-cap index funds, increasing the total cost of ownership.
Top holdings lack concentration, with no single position exceeding 1.1% of the total portfolio weight.
Fund data regarding the specific index tracked and sector weights is currently not available for review.

SPY

Pros

The fund boasts a low expense ratio of 0.09%, making it a cost-effective vehicle for large-cap exposure.
Net assets of $785.0 billion indicate massive scale, supporting high trading volumes and tight bid-ask spreads.
Established in January 1993, the trust has a lengthy track record of tracking the S&P 500 benchmark.

Considerations

Portfolio is heavily weighted towards technology and consumer discretionary giants, with the top holding exceeding 8%.
Dividend yield of 0.98% may be insufficient for income-focused investors prioritising cash distributions.
Specific details regarding the exact index methodology and sector weights are not available in the provided data.

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About MDY and SPY

MDY (MDY)

The SPDR S&P MidCap 400 ETF offers investors exposure to mid-sized companies in the US equity markets. As an exchange-traded fund, it aims to track the performance of the S&P MidCap 400 Index, which includes a diverse range of mid-cap blend stocks. With net assets of approximately $25.55 billion and 401 holdings, the fund provides a broad and balanced approach to mid-cap investing. The expense ratio of 0.23% makes it a cost-effective way to gain this exposure. Established in May 1995, the fund has a long-standing track record. It currently has a dividend yield of 1.05%, providing some income alongside potential capital appreciation. Investors should remember that values can rise and fall, and returns are not guaranteed.

SPY (SPY)

SPDR S&P 500 ETF Trust (SPY) is an exchange‑traded fund designed to track the S&P 500 index, offering investors broad exposure to large‑capitalisation US equities. It is widely used by retail and institutional investors for core portfolio allocation, tactical trading and hedging because of its deep liquidity and transparent holdings. SPY distributes dividends (typically quarterly) and reflects the performance of the underlying index, so returns move with the US large‑cap market. As with any equity product, value can fall as well as rise and past performance is not a guide to the future. Costs, tax considerations and suitability will depend on an individual’s circumstances; consult official documents and consider seeking independent advice where appropriate. This summary is general educational information and not personalised investment advice.

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MDY vs SPY

Fund Snapshot