Key Highlights

  • SPYM lists a gross expense ratio of 0.02%, compared with 0.0945% for SPY.
  • The annual expense difference equals approximately USD 7.45 on a constant USD 10,000 holding.
  • Both funds track the float-adjusted market capitalisation-weighted S&P 500 Index.
  • SPY operates as a unit Investment trust, established in January 1993.
  • Operating expenses and Transaction Costs represent separate components of ETF ownership.

The State Street SPDR Portfolio S&P 500 ETF (NYSE American: SPYM) charges substantially less than the State Street SPDR S&P 500 ETF Trust (NYSE American: SPY), despite tracking the same benchmark. The difference illustrates how product positioning, operating arrangements and trading infrastructure influence ETF economics. Legal structure provides further context, although the issuer does not attribute a specific portion of the fee gap to that distinction.

S&P 500 ETF Fees Reflect Different Product Economics

The State Street SPDR Portfolio S&P 500 ETF lists annual gross expenses of 0.02%, against 0.0945% for the State Street SPDR S&P 500 ETF Trust, according to issuer information available on 8 October 2026. The difference amounts to 0.0745 percentage points, or 7.45 basis points. Tracking an identical benchmark does not require funds to charge identical fees.

An index defines portfolio exposure. It does not determine the commercial terms of the fund delivering that exposure. Administration, operating arrangements and issuer pricing decisions exist alongside the benchmark methodology.

The clearest documented distinction concerns product positioning. The issuer describes SPYM as part of its low-cost core portfolio range, while emphasising the secondary-market depth and execution flexibility of SPY. These differences support a commercial interpretation of the pricing gap, although they do not provide a disclosed allocation of its underlying causes.

ETF Structure Provides Context for the Fee Difference

SPY, launched on 22 January 1993, is a unit investment trust. Its governing arrangements differ from those of conventional open-end funds, including the rules under which its portfolio operates.

SPYM has an inception date of 8 November 2005 and separate management and distribution arrangements. Its benchmark history requires qualification: the fund adopted the S&P 500 in January 2020, having previously followed other large-cap indices. Its inception date therefore does not represent two decades of continuous S&P 500 tracking.

Structural differences can influence portfolio operations. However, attributing the entire expense gap to legal form would exceed the available evidence. Neither the funds’ ages nor their distribution arrangements establish how the issuer determined each expense ratio.

Annual Expense Ratios and Trading Costs Differ

On a hypothetical USD 10,000 investment maintained at constant value for one year, the stated ratios imply expenses of approximately USD 2.00 and USD 9.45 respectively. These expenses accrue within each fund and reduce its net asset value rather than appearing as a separate annual invoice.

The dollar difference scales with the holding and accumulates over time. Actual outcomes also depend on portfolio values and returns. A lower expense ratio alone cannot establish which fund delivered the higher realised return during a particular period.

The market data accompanying the comparison show average daily trading of approximately 44.7 million shares for SPY, against 13.2 million for SPYM (NYSEARCA: SPYM). Share counts provide an incomplete Liquidity comparison because the funds have substantially different share prices.

Bid-ask spreads, market depth and market impact affect execution costs. These costs arise when shares change hands, whereas operating expenses accrue throughout ownership. Their relative significance consequently varies with transaction size and holding period.

Similar S&P 500 Holdings Preserve Equity-Market Risks

As of 6 October 2026, information technology represented 40.18% of SPYM. Its largest holdings were NVIDIA (NASDAQ: NVDA), Apple (NASDAQ: AAPL) and Microsoft (NASDAQ: MSFT), accounting for a combined 21.63%.

Both funds therefore retain substantial exposure to the Earnings and valuations of large technology companies. Lower fees do not reduce the concentration embedded in their shared benchmark.

Tracking differences can also arise from cash balances, Dividend timing and portfolio transactions. Expense ratios explain one measurable source of return variation, while the principal exposure remains fluctuations in US large-cap equities.