ETF comparison

IWM vs IWO overlap

Compare IWM ETF and IWO ETF by shared holdings, expense ratio, issuer, category, and tracked overlap.

Tracked overlap56.59%

860 shared holdings

IWM expense0.00%

Unknown

IWO expense0.00%

Unknown

Data date2026-05-01

2026-05-01

Shared top holdings

Overlap uses the smaller fund weight for each shared holding.

BEBLOOM ENERGY CLASS A CORP

1.95%overlap weight

CRDOCREDO TECHNOLOGY GROUP HOLDING LTD

0.88%overlap weight

FNFABRINET

0.72%overlap weight

CDECOEUR MINING INC

0.53%overlap weight

NXTNEXTPOWER INC CLASS A

0.52%overlap weight

IONQIONQ INC

0.45%overlap weight

Interpretation

Should you own both IWM and IWO?

IWM and IWO share 860 tracked holdings with 56.59% overlap in the imported holdings set. High overlap can be fine when the funds serve a deliberate role, but it can also mean less diversification than the ticker count suggests.

Use the portfolio analyzer to test your actual allocations. Pairwise overlap does not account for how much of each ETF you own.