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ETF comparison

MDY vs SPMD

Both US Mid Cap.

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

Holdings overlap

Weighted by ISIN/CUSIP
85.8 %

375 positions appear in both funds. Buying equal dollars of MDY and SPMD would leave roughly 85.8% of each dollar exposed to the same underlying securities.

MDY only 14.2% Shared 85.8% SPMD only 14.1%
In MDY only
26 positions
Shared
375 positions
In SPMD only
26 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
$28.05B
TTM yield
1.02%
Top-10 conc.
7.8%
SPMD

State Street SPDR Portfolio S&P 400 Mid Cap ETF

State Street · US Mid Cap

96 composite / 100
Expense ratio
0.030%
Net assets
$18.39B
TTM yield
1.22%
Top-10 conc.
9.1%

Sub-score comparison

77
Cost
97
88
Tax efficiency
88
100
Liquidity
100
100
Concentration
100
—
Tracking quality
—
MDY sub-score SPMD

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

Cost difference

SPMD is 20 bps cheaper than MDY. On a $100,000 position that's about $200/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 SPMD.

Top shared holdings

375 shared in total
# Holding In MDY In SPMD Overlap
1 Curtiss-Wright Corporation 0.78% 0.79% 0.78%
2 XPO Inc. 0.67% 0.71% 0.67%
3 Woodward Inc. 0.69% 0.67% 0.67%
4 United Therapeutics Corporation 0.65% 0.80% 0.65%
5 US Foods Holding Corp. 0.64% 0.64% 0.64%
6 ATI Inc 0.71% 0.62% 0.62%
7 MasTec Inc. 0.64% 0.62% 0.62%
8 Carpenter Technology Corporation 0.82% 0.61% 0.61%
9 Twilio Inc. Class A 0.88% 0.60% 0.60%
10 Illumina Inc. 0.79% 0.59% 0.59%
11 Everpure Inc. Class A 0.64% 0.58% 0.58%
12 Entegris Inc. 0.62% 0.56% 0.56%

Only in MDY

26 total
  • U.S. Dollar 0.84%
  • TechnipFMC plc 0.74%
  • nVent Electric plc 0.68%
  • Roku Inc. Class A 0.52%
  • Fabrinet 0.50%
  • Coeur Mining Inc. 0.50%
  • Roivant Sciences Ltd. 0.44%
  • Jazz Pharmaceuticals Public Limited Company 0.42%
  • RenaissanceRe Holdings Ltd. 0.39%
  • Toast Inc. Class A 0.37%

Only in SPMD

26 total
  • TechnipFMC PLC 0.87%
  • Casey's General Stores Inc 0.84%
  • Flex Ltd 0.75%
  • nVent Electric PLC 0.60%
  • Fabrinet 0.58%
  • RenaissanceRe Holdings Ltd 0.40%
  • Roivant Sciences Ltd 0.39%
  • Jazz Pharmaceuticals PLC 0.36%
  • TopBuild Corp 0.31%
  • CNH Industrial NV 0.30%

Open MDY or SPMD 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.