ETF comparison

IBB vs IWM overlap

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

Tracked overlap8.65%

156 shared holdings

IBB expense0.00%

Unknown

IWM expense0.00%

Unknown

Data date2026-05-01

2026-05-01

Shared top holdings

Overlap uses the smaller fund weight for each shared holding.

BBIOBRIDGEBIO PHARMA INC

0.35%overlap weight

ARWRARROWHEAD PHARMACEUTICALS INC

0.30%overlap weight

MDGLMADRIGAL PHARMACEUTICALS INC

0.28%overlap weight

PRAXPRAXIS PRECISION MEDICINES INC

0.26%overlap weight

AXSMAXSOME THERAPEUTICS INC

0.24%overlap weight

CYTKCYTOKINETICS INC

0.22%overlap weight

Interpretation

Should you own both IBB and IWM?

IBB and IWM share 156 tracked holdings with 8.65% 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.