ETF comparison
IWS vs VOO
US Mid Cap vs US Large Cap.
Holdings overlap
278 positions appear in both funds. Buying equal dollars of IWS and VOO would leave roughly 11.5% 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
VOO is 20 bps cheaper than IWS. On a $100,000 position that's about $200/yr more in fees for IWS.
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 IWS vs VOO.
Top shared holdings
278 shared in total| # | Holding | In IWS | In VOO | Overlap |
|---|---|---|---|---|
| 1 | ROBINHOOD MARKETS INC | 0.13% | 0.12% | 0.12% |
| 2 | ROYAL CARIBBEAN CRUISES LTD | 0.34% | 0.12% | 0.12% |
| 3 | COHERENT CORP | 0.54% | 0.12% | 0.12% |
| 4 | MARATHON PETROLEUM CORP | 0.36% | 0.12% | 0.12% |
| 5 | UNITED RENTALS INC | 0.53% | 0.11% | 0.11% |
| 6 | PHILLIPS 66 | 0.62% | 0.11% | 0.11% |
| 7 | WARNER BROS. DISCOVERY INC | 0.63% | 0.10% | 0.10% |
| 8 | KINDER MORGAN INC | 0.61% | 0.10% | 0.10% |
| 9 | ALLSTATE CORP (THE) | 0.60% | 0.09% | 0.09% |
| 10 | DELTA AIR LINES INC | 0.56% | 0.09% | 0.09% |
| 11 | KEYSIGHT TECHNOLOGIES INC | 0.25% | 0.09% | 0.09% |
| 12 | HEWLETT PACKARD ENTERPRISE COMPANY | 0.59% | 0.09% | 0.09% |
Only in IWS
442 total- CHENIERE ENERGY INC 0.46%
- FERGUSON ENTERPRISES INC 0.42%
- SUNBELT RENTALS HOLDINGS INC 0.30%
- MKS INC 0.27%
- ILLUMINA INC 0.26%
- TWILIO INC 0.25%
- MARKEL GROUP INC 0.24%
- ENTEGRIS INC 0.23%
- ROYALTY PHARMA PLC 0.23%
- OKTA INC 0.22%
Only in VOO
226 total- NVIDIA Corp 7.51%
- Apple Inc 6.59%
- Microsoft Corp 4.30%
- Amazon.com Inc 3.62%
- Alphabet Inc 3.25%
- Broadcom Inc 2.77%
- Alphabet Inc 2.59%
- Micron Technology Inc 2.02%
- Meta Platforms Inc 1.92%
- Tesla Inc 1.84%
Related comparisons
More comparisons with IWS
- IWS vs SPYM · State Street SPDR Portfolio S&P 500 ETF 11.5%
- IWS vs IVV · iShares Core S&P 500 ETF 11.5%
- IWS vs IWP · iShares Russell Mid-Cap Growth ETF 10.6%
- IWS vs SPY · State Street SPDR S&P 500 ETF Trust 10.4%
- IWS vs SCHD · Schwab U.S. Dividend Equity ETF 6.4%
- IWS vs VUG · Vanguard Morningstar Growth ETF 3.0%
More comparisons with VOO
- VOO vs NOBL · ProShares S&P 500 Dividend Aristocrats ETF 11.0%
- VOO vs VOE · Vanguard Morningstar Mid-Cap Value ETF 9.9%
- VOO vs RPV · Invesco S&P 500 Pure Value ETF 9.1%
- VOO vs HDV · iShares Core High Dividend ETF 8.7%
- VOO vs SCHD · Schwab U.S. Dividend Equity ETF 7.6%
- VOO vs DVY · iShares Select Dividend ETF 7.4%
Percentages are holdings overlap with the named fund.
Open IWS or VOO 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.