etf overlap tool · little overlap
IWM vs ARKK overlap
1.2% of IWM and ARKK is the same money, spread over 11 companies both funds hold.
Holdings as of September 25, 2026 · source: iShares (IWM), ARK Invest (ARKK) · How we measured all 1,431 pairs
- same money
- same companies, extra weight
- only in this fund
Hold IWM and ARKK with other funds or stocks? The free portfolio optimizer opens IWM and ARKK beside the rest of what you own: the companies you hold twice, what the funds cost a year, and where the next deposit should go. No account.
What only one of them gives you
TSLATESLA INC9.18%
COINCOINBASE GLOBAL INC -CLASS A4.57%
SHOPSHOPIFY INC - CLASS A3.08%
Where each fund puts its money
IWM and ARKK: what people ask
How much do IWM and ARKK overlap?
1.2% by weight, as of September 25, 2026: little overlap. 11 companies appear in both funds; they make up 1.2% of IWM and 21% of ARKK.
Which stocks do IWM and ARKK both hold?
The largest shared positions are TWST, TXG, CRSP, VCYT and ACHR. Ranked by the smaller of the two weights, which is the part you would own twice.
Is it redundant to hold both IWM and ARKK?
Out of every $100 split evenly between them, about $1 (half in each fund) buys identical positions. The rest is exposure only one of the two funds gives you: 1,960 names only in IWM, 34 only in ARKK. Half in each behaves like 103 equally weighted stocks, against 834 for IWM alone and 27 for ARKK 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 and ARK Invest 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.