IJH vs IWM: 12% overlap
iShares Core S&P Mid-Cap ETF and iShares Russell 2000 ETF share 12.0% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
You would hold two tickers and get the diversification of 1.9. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
IJH and IWM hold 81 of the same securities. The ten contributing most to the overlap figure:
| Holding | in IJH | in IWM | Δ |
|---|---|---|---|
| MOG-A | 0.3% | 0.4% | 0.1% |
| CYTK | 0.3% | 0.3% | 0.0% |
| BTSG | 0.3% | 0.4% | 0.1% |
| CTRE | 0.3% | 0.3% | 0.0% |
| UMBF | 0.3% | 0.3% | 0.1% |
| ONB | 0.3% | 0.3% | 0.0% |
| KRYS | 0.2% | 0.3% | 0.0% |
| HQY | 0.2% | 0.3% | 0.0% |
| TEX | 0.2% | 0.3% | 0.0% |
| FCFS | 0.2% | 0.3% | 0.1% |
Where IJH and IWM differ
Sector weights as a share of each fund, ordered by the size of the gap rather than the size of the sector — two funds that overlap heavily still usually diverge somewhere.
| Sector | IJH | IWM | Δ |
|---|---|---|---|
| Industrials | 25.5% | 14.7% | +10.8pp |
| Health Care | 10.0% | 19.9% | −9.9pp |
| Financials | 15.1% | 19.0% | −3.9pp |
| Materials | 5.5% | 4.2% | +1.2pp |
| Energy | 4.9% | 6.1% | −1.2pp |
| Information Technology | 13.9% | 12.8% | +1.1pp |
| Communication Services | 1.5% | 2.5% | −1.0pp |
| Real Estate | 6.9% | 5.9% | +1.0pp |
Δ is IJH minus IWM, in percentage points. Sector data is not published by every issuer, so “Unclassified” is a real category rather than a gap in the table.
What each fund holds alone
88.0% of IJH by weight, held in no part of IWM.
86.0% of IWM by weight, held in no part of IJH.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| IJH | IWM | |
|---|---|---|
| Top 10 holdings | 7.6% | 3.3% |
| Positions held | 404 | 1,967 |
| Cost per $10,000 held, per year | $5 | $19 |
Cost is the expense ratio applied to $10,000; it excludes any brokerage commission, bid-ask spread or tax consequence. Figures are facts about the funds, not a suggestion about which to hold.
Frequently asked
How much do IJH and IWM overlap?
IJH and IWM overlap 12.0% by portfolio weight — largely distinct portfolios. They share 81 holdings. The figure comes from current issuer holdings files (IJH as of 2026-07-23, IWM as of 2026-07-23).
How is the overlap between IJH and IWM calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If IJH holds a stock at 6% and IWM holds the same stock at 4%, 4% counts as shared. The result is bounded between 0% and 100%, and it is computed after looking through any fund-of-funds to the underlying holdings.
Is it redundant to hold both IJH and IWM?
That depends on your goals — we state facts, not advice. At 12.0% overlap, each fund still contributes meaningfully distinct exposure.
What does IJH own that IWM doesn't?
IJH holds 404 positions and IWM holds 1,967; 322 of IJH's positions don't appear in IWM at all, and they are 88.0% of IJH by weight.
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Related comparisons
Sources: issuer holdings files, IJH as of 2026-07-23, IWM as of 2026-07-23. Weights are fractions of each fund. Diagnostics, not advice.