IJR vs IWM: how much do they overlap?
iShares Core S&P Small-Cap ETF (IJR) · iShares Russell 2000 ETF (IWM)
overlap by weight · 532 shared holdings
IJR: 605 holdings (as of 2026-03-31) · IWM: 1934 holdings (as of 2026-03-31)
Moderate overlap
What this means
IJR and IWM share a meaningful slice of holdings. They are related but not interchangeable; check the shared names below to see where your exposure doubles up.
Overlap by weight sums the smaller of the two funds' weights for every stock they both hold — it answers "how much of my money is in the same stocks either way?" See methodology.
Top shared holdings
| Company | Ticker | in IJR | in IWM |
|---|---|---|---|
| SM Energy Co. | SM | 0.46% | 0.26% |
| Primoris Services Corp. | PRIM | 0.5% | 0.26% |
| Viavi Solutions Inc | VIAV | 0.5% | 0.26% |
| Formfactor Inc | FORM | 0.49% | 0.26% |
| Argan Inc | AGX | 0.49% | 0.25% |
| ESCO Technologies Inc. | ESE | 0.48% | 0.25% |
| Semtech Corporation | SMTC | 0.46% | 0.24% |
| Sanmina Corp | SANM | 0.46% | 0.24% |
| Zurn Elkay Water Solutions Corporation | ZWS | 0.43% | 0.23% |
| JBT Marel Corp. | JBTM | 0.43% | 0.23% |
FAQ
How much do IJR and IWM overlap?
IJR and IWM have a 42.2% overlap by weight, sharing 532 holdings (out of 605 in IJR and 1934 in IWM), based on official issuer holdings as of 2026-03-31.
What does 42.2% overlap mean?
IJR and IWM share a meaningful slice of holdings. They are related but not interchangeable; check the shared names below to see where your exposure doubles up.
Which stocks do IJR and IWM both hold?
The largest shared positions are SM Energy Co., Primoris Services Corp., Viavi Solutions Inc, Formfactor Inc, Argan Inc. The full list of top shared holdings with weights in each fund is shown on this page.