etf overlap tool · little overlap
IWM vs IEFA overlap
0.0% of IWM and IEFA is the same money, spread over 2 companies both funds hold.
Holdings as of October 16, 2026 · source: iShares (IWM), iShares (IEFA) · How we measured all 1,431 pairs
- same money
- same companies, extra weight
- only in this fund
What only one of them gives you
Where each fund puts its money
IWM and IEFA: what people ask
How much do IWM and IEFA overlap?
0.0% by weight, as of October 16, 2026: little overlap. 2 companies appear in both funds; they make up 0.1% of IWM and 0.0% of IEFA.
Which stocks do IWM and IEFA both hold?
The largest shared positions are BTDR and ODD. Ranked by the smaller of the two weights, which is the part you would own twice.
Is it redundant to hold both IWM and IEFA?
Out of every $100 split evenly between them, about $0 (half in each fund) buys identical positions. The rest is exposure only one of the two funds gives you: 1,969 names only in IWM, 2,616 only in IEFA. Half in each behaves like 800 equally weighted stocks, against 834 for IWM alone and 263 for IEFA alone. Whether that duplication is a problem depends on the mix you want; this is a description, not advice.
How is ETF overlap calculated here?
For every company held by both funds we take the smaller of its two weights and add them up. The weights come from the full holdings files iShares publish, not a top-10 sample, and companies are matched by their ISIN so share classes stay apart. Sector overlap applies the same rule to the issuers' sector labels; "behaves like N equally weighted stocks" is one over the sum of the squared weights.
Weights come from each issuer's published holdings file and are matched company by company on their ISIN. Cash, futures and currency positions are left out. This page describes what the funds hold; it is not investment advice.