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ETF comparison

IJK vs SPY

US Mid Cap vs US Large Cap.

iShares S&P Mid-Cap 400 Growth ETF · State Street SPDR S&P 500 ETF Trust

Holdings overlap

Weighted by ISIN/CUSIP
0.1 %

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

IJK unmatched 99.7% Shared 0.1% SPY 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 IJK only
241 positions
Shared
2 positions
In SPY only
503 positions

Side by side

IJK

iShares S&P Mid-Cap 400 Growth ETF

iShares · US Mid Cap

91 composite / 100
Expense ratio
0.16%
Net assets
$10.29B
TTM yield
0.59%
Top-10 conc.
14.4%
SPY

State Street SPDR S&P 500 ETF Trust

State Street · US Large Cap

88 composite / 100
Expense ratio
0.094%
Net assets
$809.22B
TTM yield
0.99%
Top-10 conc.
37.9%

Sub-score comparison

84
Cost
91
89
Tax efficiency
89
100
Liquidity
100
94
Concentration
60
—
Tracking quality
—
IJK sub-score SPY

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

Cost difference

SPY is 7 bps cheaper than IJK. On a $100,000 position that's about $66/yr more in fees for IJK.

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 IJK vs SPY.

Top shared holdings

2 shared in total
# Holding In IJK In SPY Overlap
1 Everpure, Inc. 1.32% 0.07% 0.07%
2 Illumina, Inc. 0.76% 0.06% 0.06%

Only in IJK

241 total
  • Twilio, Inc. 1.66%
  • Carpenter Technology Corp. 1.62%
  • Curtiss-Wright Corp. 1.48%
  • nVent Electric plc 1.45%
  • ATI, Inc. 1.42%
  • TechnipFMC plc 1.40%
  • Sterling Infrastructure, Inc. 1.36%
  • MasTec, Inc. 1.36%
  • Woodward, Inc. 1.34%
  • MACOM Technology Solutions Holdings, Inc. 1.32%

Only in SPY

503 total
  • NVIDIA CORP 8.50%
  • APPLE INC 7.32%
  • MICROSOFT CORP 5.77%
  • AMAZON.COM INC 3.71%
  • ALPHABET INC CL A 3.03%
  • BROADCOM INC 2.54%
  • ALPHABET INC CL C 2.43%
  • META PLATFORMS INC CLASS A 2.41%
  • MICRON TECHNOLOGY INC 1.82%
  • TESLA INC 1.57%

Related comparisons

More comparisons with IJK

More comparisons with SPY

Percentages are holdings overlap with the named fund.

Open IJK 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.