ETF comparison
SPY vs VO
US Large Cap vs US Mid Cap.
State Street SPDR S&P 500 ETF Trust · Vanguard Morningstar Mid-Cap ETF
Holdings overlap
248 positions appear in both funds. Buying equal dollars of SPY and VO would leave roughly 15.5% 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
VO is 6 bps cheaper than SPY. On a $100,000 position that's about $64/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 SPY vs VO.
Top shared holdings
248 shared in total| # | Holding | In SPY | In VO | Overlap |
|---|---|---|---|---|
| 1 | SEAGATE TECHNOLOGY HOLDINGS | 0.29% | 1.05% | 0.29% |
| 2 | WESTERN DIGITAL CORP | 0.22% | 1.06% | 0.22% |
| 3 | NEWMONT CORP | 0.18% | 0.48% | 0.18% |
| 4 | MARATHON PETROLEUM CORP | 0.18% | 0.72% | 0.18% |
| 5 | VALERO ENERGY CORP | 0.18% | 0.75% | 0.18% |
| 6 | FORTINET INC | 0.17% | 0.46% | 0.17% |
| 7 | PHILLIPS 66 | 0.16% | 0.66% | 0.16% |
| 8 | QUANTA SERVICES INC | 0.15% | 1.04% | 0.15% |
| 9 | VERTIV HOLDINGS CO A | 0.15% | 1.22% | 0.15% |
| 10 | LUMENTUM HOLDINGS INC | 0.14% | 0.65% | 0.14% |
| 11 | JOHNSON CONTROLS INTERNATION | 0.14% | 0.43% | 0.14% |
| 12 | DATADOG INC CLASS A | 0.14% | 0.83% | 0.14% |
Only in SPY
257 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%
Only in VO
34 total- Cloudflare Inc 0.76%
- Rocket Lab Corp 0.57%
- ONEOK Inc 0.53%
- Electronic Arts Inc 0.50%
- Cheniere Energy Inc 0.48%
- Waste Connections Inc 0.41%
- Snowflake Inc 0.41%
- Alnylam Pharmaceuticals Inc 0.39%
- Coreweave Inc 0.37%
- Astera Labs Inc 0.36%
Related comparisons
More comparisons with SPY
- SPY vs MOAT · VanEck Morningstar Wide Moat ETF 14.4%
- SPY vs VLUE · iShares MSCI USA Value Factor ETF 12.8%
- SPY vs IWR · iShares Russell Mid-Cap ETF 12.1%
- SPY vs SDY · State Street SPDR S&P Dividend ETF 11.8%
- SPY vs IWS · iShares Russell Mid-Cap Value ETF 10.4%
- SPY vs RPV · Invesco S&P 500 Pure Value ETF 9.5%
More comparisons with VO
- VO vs IWV · iShares Russell 3000 ETF 15.5%
- VO vs DFUS · Dimensional U.S. Equity Market ETF 15.4%
- VO vs VTHR · Vanguard Russell 3000 Index Fund ETF Shares 15.2%
- VO vs SPTM · State Street SPDR Portfolio S&P 1500 Composite Stock Market ETF 15.1%
- VO vs OMFL · Invesco Russell 1000 Dynamic Multifactor ETF 14.9%
- VO vs JAVA · JPMorgan Active Value ETF 14.1%
Percentages are holdings overlap with the named fund.
Open SPY or VO 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.