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ETF comparison

MDY vs SPYM

US Mid Cap vs US Large Cap.

State Street SPDR S&P MIDCAP 400 ETF Trust · State Street SPDR Portfolio S&P 500 ETF

Holdings overlap

Weighted by ISIN/CUSIP
0.1 %

1 positions appear in both funds. Buying equal dollars of MDY and SPYM would leave roughly 0.1% of each dollar exposed to the same underlying securities.

MDY unmatched 99.9% Shared 0.1% SPYM unmatched 99.8%

Unmatched is the part of a fund's weight the other fund doesn't match: names only it holds, plus any extra weight it puts in names both funds hold.

In MDY only
400 positions
Shared
1 positions
In SPYM only
505 positions

Side by side

MDY

State Street SPDR S&P MIDCAP 400 ETF Trust

State Street · US Mid Cap

88 composite / 100
Expense ratio
0.23%
Net assets
$25.95B
TTM yield
1.04%
Top-10 conc.
7.2%
SPYM

State Street SPDR Portfolio S&P 500 ETF

State Street · US Large Cap

91 composite / 100
Expense ratio
0.020%
Net assets
$181.85B
TTM yield
1.03%
Top-10 conc.
36.4%

Sub-score comparison

77
Cost
98
88
Tax efficiency
88
100
Liquidity
100
100
Concentration
62
—
Tracking quality
—
MDY sub-score SPYM

Tracking quality isn't part of the composite — see what we don't score for why.

Cost difference

SPYM is 21 bps cheaper than MDY. On a $100,000 position that's about $210/yr more in fees for MDY.

Fee figure is the annual expense charged on $100,000. To see how the gap compounds over a multi-decade holding period, open the cost calculator pre-filled with MDY vs SPYM.

Top shared holdings

1 shared in total
# Holding In MDY In SPYM Overlap
1 Corteva Inc 0.23% 0.09% 0.09%

Only in MDY

400 total
  • U.S. Dollar 0.77%
  • United Therapeutics Corporation 0.75%
  • TechnipFMC plc 0.72%
  • ATI Inc 0.70%
  • US Foods Holding Corp. 0.68%
  • Tenet Healthcare Corporation 0.67%
  • Reliance Inc. 0.65%
  • XPO Inc. 0.63%
  • Entegris Inc. 0.63%
  • Roku Inc. Class A 0.62%

Only in SPYM

505 total
  • NVIDIA Corp 7.51%
  • Apple Inc 6.59%
  • Microsoft Corp 4.29%
  • Amazon.com Inc 3.62%
  • Alphabet Inc 3.25%
  • Broadcom Inc 2.77%
  • Alphabet Inc 2.59%
  • Micron Technology Inc 2.02%
  • Meta Platforms Inc 1.92%
  • Tesla Inc 1.83%

Related comparisons

More comparisons with MDY

More comparisons with SPYM

Percentages are holdings overlap with the named fund.

Open MDY or SPYM at a brokerage

Both funds trade commission-free at major US brokerages.

Open at Fidelity

Affiliate links — opening an account through these earns PlainIndex a one-time referral. Scoring is computed before any affiliate consideration; see our methodology and funding disclosure.

Holdings overlap is the sum of min(weight_a, weight_b) over positions matched on ISIN (CUSIP fallback). Methodology: see /methodology/.

Comparing two funds doesn't endorse swapping one for the other. Tax-lot history, account type, and personal goals matter — PlainIndex publishes data and methodology, not investment advice.