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ETF comparison

SPMD vs SPY

US Mid Cap vs US Large Cap.

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

Holdings overlap

Weighted by ISIN/CUSIP
0.2 %

4 positions appear in both funds. Buying equal dollars of SPMD and SPY would leave roughly 0.2% of each dollar exposed to the same underlying securities.

SPMD unmatched 99.6% Shared 0.2% SPY unmatched 99.7%

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 SPMD only
396 positions
Shared
4 positions
In SPY only
500 positions

Side by side

SPMD

State Street SPDR Portfolio S&P 400 Mid Cap ETF

State Street · US Mid Cap

92 composite / 100
Expense ratio
0.15%
Net assets
$18.64B
TTM yield
1.29%
Top-10 conc.
7.7%
SPY

State Street SPDR S&P 500 ETF Trust

State Street · US Large Cap

88 composite / 100
Expense ratio
0.094%
Net assets
$796.87B
TTM yield
1.01%
Top-10 conc.
37.3%

Sub-score comparison

85
Cost
91
88
Tax efficiency
88
100
Liquidity
100
100
Concentration
61
—
Tracking quality
—
SPMD sub-score SPY

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

Cost difference

SPY is 6 bps cheaper than SPMD. On a $100,000 position that's about $56/yr more in fees for SPMD.

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 SPMD vs SPY.

Top shared holdings

4 shared in total
# Holding In SPMD In SPY Overlap
1 Everpure Inc 0.68% 0.06% 0.06%
2 Illumina Inc 0.73% 0.05% 0.05%
3 Twilio Inc 0.86% 0.05% 0.05%
4 Okta Inc 0.63% 0.05% 0.05%

Only in SPMD

396 total
  • Carpenter Technology Corp 0.84%
  • MKS Inc 0.83%
  • Curtiss-Wright Corp 0.77%
  • Entegris Inc 0.76%
  • nVent Electric PLC 0.76%
  • ATI Inc 0.74%
  • TechnipFMC PLC 0.73%
  • Sterling Infrastructure Inc 0.71%
  • MasTec Inc 0.71%
  • Woodward Inc 0.70%

Only in SPY

500 total
  • APPLE INC 7.69%
  • NVIDIA CORP 7.30%
  • MICROSOFT CORP 6.22%
  • AMAZON.COM INC 3.94%
  • ALPHABET INC CL A 2.56%
  • BROADCOM INC 2.33%
  • META PLATFORMS INC CLASS A 2.09%
  • ALPHABET INC CL C 2.06%
  • ELI LILLY + CO 1.71%
  • TESLA INC 1.64%

Related comparisons

More comparisons with SPMD

More comparisons with SPY

Percentages are holdings overlap with the named fund.

Open SPMD or SPY 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.