ETF comparison
IVOO vs SPY
US Mid Cap vs US Large Cap.
Vanguard S&P Mid-Cap 400 Index Fund ETF Shares · State Street SPDR S&P 500 ETF Trust
Holdings overlap
4 positions appear in both funds. Buying equal dollars of IVOO and SPY would leave roughly 0.2% of each dollar exposed to the same underlying securities.
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.
Side by side
Sub-score comparison
Tracking quality isn't part of the composite — see what we don't score for why.
Cost difference
IVOO is 2 bps cheaper than SPY. On a $100,000 position that's about $24/yr more in fees for SPY.
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 IVOO vs SPY.
Top shared holdings
4 shared in total| # | Holding | In IVOO | In SPY | Overlap |
|---|---|---|---|---|
| 1 | Everpure Inc | 0.82% | 0.06% | 0.06% |
| 2 | Illumina Inc | 0.91% | 0.05% | 0.05% |
| 3 | Twilio Inc | 1.00% | 0.05% | 0.05% |
| 4 | Okta Inc | 0.81% | 0.05% | 0.05% |
Only in IVOO
396 total- TechnipFMC PLC 0.87%
- ATI Inc 0.78%
- nVent Electric PLC 0.68%
- Carpenter Technology Corp 0.66%
- US Foods Holding Corp 0.65%
- Tenet Healthcare Corp 0.64%
- XPO Inc 0.64%
- United Therapeutics Corp 0.61%
- Curtiss-Wright Corp 0.60%
- Coeur Mining Inc 0.60%
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 IVOO
More comparisons with SPY
- SPY vs SPMD · State Street SPDR Portfolio S&P 400 Mid Cap ETF 0.2%
- SPY vs IJJ · iShares S&P Mid-Cap 400 Value ETF 0.1%
- SPY vs MDY · State Street SPDR S&P MIDCAP 400 ETF Trust 0.0%
- SPY vs AVUV · Avantis US Small Cap Value ETF 0.0%
- SPY vs BBSC · JPMorgan BetaBuilders U.S. Small Cap Equity ETF 0.0%
- SPY vs DEM · WisdomTree Emerging Markets High Dividend Fund 0.0%
Percentages are holdings overlap with the named fund.
Open IVOO 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.