ITOT vs VO: how much do they overlap?
iShares Core S&P Total U.S. Stock Market ETF (ITOT) · Vanguard Mid-Cap ETF (VO)
overlap by weight · 286 shared holdings
ITOT: 2470 holdings (as of 2026-03-31) · VO: 289 holdings (as of 2026-03-31)
Low overlap
What this means
ITOT and VO hold mostly different stocks. Combining them genuinely spreads your exposure across different parts of the market.
Overlap by weight sums the smaller of the two funds' weights for every stock they both hold — it answers "how much of my money is in the same stocks either way?" See methodology.
Top shared holdings
| Company | Ticker | in ITOT | in VO |
|---|---|---|---|
| Newmont Corp. | NEM | 0.19% | 0.64% |
| Corning, Inc. | GLW | 0.17% | 0.57% |
| Vertiv Holdings Co. | VRT | 0.15% | 1.03% |
| Howmet Aerospace, Inc. | HWM | 0.15% | 1.01% |
| Western Digital Corp. | WDC | 0.14% | 1% |
| Williams Cos., Inc. (The) | WMB | 0.14% | 0.48% |
| Constellation Energy Corp. | CEG | 0.14% | 0.94% |
| Marvell Technology, Inc. | MRVL | 0.14% | 0.47% |
| Seagate Technology Holdings plc | STX | 0.13% | 0.93% |
| Quanta Services, Inc. | PWR | 0.13% | 0.89% |
FAQ
How much do ITOT and VO overlap?
ITOT and VO have a 16.1% overlap by weight, sharing 286 holdings (out of 2470 in ITOT and 289 in VO), based on official issuer holdings as of 2026-03-31.
What does 16.1% overlap mean?
ITOT and VO hold mostly different stocks. Combining them genuinely spreads your exposure across different parts of the market.
Which stocks do ITOT and VO both hold?
The largest shared positions are Newmont Corp., Corning, Inc., Vertiv Holdings Co., Howmet Aerospace, Inc., Western Digital Corp.. The full list of top shared holdings with weights in each fund is shown on this page.