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ETF comparison

OEF vs SPY

Both US Large Cap.

iShares S&P 100 ETF · State Street SPDR S&P 500 ETF Trust

Holdings overlap

Weighted by ISIN/CUSIP
70.5 %

98 positions appear in both funds. Buying equal dollars of OEF and SPY would leave roughly 70.5% of each dollar exposed to the same underlying securities.

OEF unmatched 29.4% Shared 70.5% SPY unmatched 29.4%

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 OEF only
4 positions
Shared
98 positions
In SPY only
406 positions

Side by side

OEF

iShares S&P 100 ETF

iShares · US Large Cap

81 composite / 100
Expense ratio
0.20%
Net assets
$20.04B
TTM yield
0.88%
Top-10 conc.
50.7%
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

80
Cost
91
89
Tax efficiency
88
100
Liquidity
100
42
Concentration
61
—
Tracking quality
—
OEF sub-score SPY

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

Cost difference

SPY is 11 bps cheaper than OEF. On a $100,000 position that's about $106/yr more in fees for OEF.

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 OEF vs SPY.

Top shared holdings

98 shared in total
# Holding In OEF In SPY Overlap
1 APPLE INC 9.18% 7.69% 7.69%
2 NVIDIA CORP 10.47% 7.30% 7.30%
3 MICROSOFT CORP 5.99% 6.22% 5.99%
4 AMAZON.COM INC 5.04% 3.94% 3.94%
5 ALPHABET INC 4.53% 2.56% 2.56%
6 BROADCOM INC 3.86% 2.33% 2.33%
7 META PLATFORMS INC 2.67% 2.09% 2.09%
8 ALPHABET INC 3.61% 2.06% 2.06%
9 ELI LILLY & COMPANY 2.05% 1.71% 1.71%
10 TESLA INC 2.56% 1.64% 1.64%
11 BERKSHIRE HATHAWAY INC 1.98% 1.63% 1.63%
12 JP MORGAN CHASE & COMPANY 1.89% 1.41% 1.41%

Only in OEF

4 total
  • EXXONMOBIL HOLDINGS CORP 1.22%
  • LINDE PLC 0.52%
  • MEDTRONIC PLC 0.22%
  • ACCENTURE PLC 0.17%

Only in SPY

406 total
  • EXXONMOBIL HOLDINGS CORP 1.05%
  • PALO ALTO NETWORKS INC 0.43%
  • CROWDSTRIKE HOLDINGS INC A 0.37%
  • LINDE PLC 0.36%
  • ANALOG DEVICES INC 0.30%
  • KLA CORP 0.30%
  • AMPHENOL CORP CL A 0.29%
  • ARISTA NETWORKS INC 0.28%
  • WELLTOWER INC 0.27%
  • ACCENTURE PLC CL A 0.24%

Percentages are holdings overlap with the named fund.

Open OEF or SPY at a brokerage

Both funds trade commission-free at major US brokerages.

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.