IVOO vs IWM: Holdings Overlap
IVOOVanguard S&P Mid-cap 400 Index Fund
Vanguard · 400 holdings · $3.9B · as of 2026-05-31
iShares · 1941 holdings · $82.2B · as of 2026-03-31
Holdings snapshots are 61 days apart (IVOO: 2026-05-31, IWM: 2026-03-31). Weights and index membership change between snapshots, so the true current overlap is typically higher than shown. For funds tracking the same index, the gap can be 5–15 points.
How similar are IVOO and IWM?
Vanguard S&P Mid-cap 400 Index Fund (IVOO, by Vanguard) holds 400 positions; iShares Russell 2000 ETF (IWM, by iShares) holds 1941. They have 92 holdings in common, and by portfolio weight the two funds are 16.6% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 16.6%Sum of the smaller weight of each shared holding
- Shared Holdings
- 92IVOO holds 400 · IWM holds 1941
- Weight in Shared Holdings
- IVOO 18%·IWM 19%Share of each fund's weight in stocks both funds own
Based on each fund's latest official holdings. How is this calculated?
What makes each fund different
Only in IVOO
308 of 400 positions (81.8% of the fund) are not held by IWM. Showing the top 30 by weight.
Only in IWM
1849 of 1941 positions (81.0% of the fund) are not held by IVOO. Showing the top 30 by weight.
Sector Breakdown
| Sector | IVOO | IWM |
|---|---|---|
| Industrials | 25.6% | 17.9% |
| Health Care | 8.7% | 16.6% |
| Information Technology | 15.7% | 13.6% |
| Financials | 14.3% | 15.3% |
| Consumer Discretionary | 11.1% | 8.0% |
| Other Sectors | 24.4% | 22.7% |
| Unclassified | 0.0% | 5.5% |
Share of each fund's portfolio weight by GICS-style sector, compiled from issuer fund data and our own classification of the holdings, not the issuers' published sector charts. “Unclassified” is weight we could not classify (0% of IVOO, 5% of IWM).
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| IVOO | +3.1% | +18.5% | +26.0% | +14.6% | +9.0% | +11.2% | 1.14% |
| IWM | +1.8% | +23.0% | +38.6% | +17.1% | +7.5% | +10.8% | 0.88% |
Total returns including dividends, from adjusted daily closes as of 2026-08-07. 3Y/5Y/10Y are annualized. Yield is trailing-12-month distributions over the last close. Past performance does not predict future results.
Project the growth of $10,000 in IVOO vs IWM →
Shared Holdings(92)
The top 10 shared positions account for 24% of the overlap, led by FN, NXT and STRL.
 FNFabrinet COM USD0.01 | 0.67% | 0.64% | 0.64% |
|---|---|---|---|
 NXTNextpower Inc. CLASS A COM | 0.66% | 0.60% | 0.60% |
 STRLSterling Infrastructure Inc COM | 0.75% | 0.41% | 0.41% |
 HLHecla Mining Company COM | 0.34% | 0.40% | 0.34% |
 TTMITTM Technologies Inc COM | 0.51% | 0.34% | 0.34% |
 KTOSKratos Defense & Security Solutions, Inc. COM NEW | 0.34% | 0.43% | 0.34% |
 DYDycom Industries, Inc. COM | 0.44% | 0.34% | 0.34% |
 AEISAdvanced Energy Industries, Inc. COM | 0.33% | 0.41% | 0.33% |
 RMBSRambus Inc. COM | 0.45% | 0.32% | 0.32% |
 SPXCSPX Technologies, Inc. COM | 0.31% | 0.33% | 0.31% |
 ARWRArrowhead Pharmaceuticals Inc COM | 0.31% | 0.29% | 0.29% |
 MOG-AMoog, Inc., Class A | 0.29% | 0.28% | 0.28% |
 ENSGEnsign Group, Inc. (The) | 0.28% | 0.38% | 0.28% |
 CYTKCytokinetics Incorporated | 0.29% | 0.27% | 0.27% |
 UMBFUMB Financial Corporation | 0.27% | 0.28% | 0.27% |
| Chart Industries Inc COM | 0.27% | 0.32% | 0.27% |
 SITMSitime Corporation COM | 0.45% | 0.26% | 0.26% |
 CTRECaretrust Reit Inc COM | 0.26% | 0.28% | 0.26% |
 AHRAmerican Healthcare REIT Inc. COM SHS | 0.25% | 0.29% | 0.25% |
 FCFSFirstcash Holdings Inc COM | 0.24% | 0.25% | 0.24% |
 WTSWatts Water Technologies, Inc., Class A | 0.24% | 0.27% | 0.24% |
 ONBOld National Bancorp COM | 0.24% | 0.26% | 0.24% |
 CMCCommercial Metals Company COM | 0.24% | 0.23% | 0.23% |
 ORAOrmat Technologies Inc. COM | 0.24% | 0.23% | 0.23% |
 DOCNDigitalOcean Holdings Inc COM | 0.35% | 0.22% | 0.22% |
Frequently Asked Questions
How much do IVOO and IWM overlap?
IVOO and IWM overlap by 16.6% of portfolio weight. They share 92 holdings (IVOO holds 400 positions and IWM holds 1941), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IVOO and IWM?
The two portfolios are 16.6% identical by weight. Owning both is not redundant. Most of each portfolio is distinct, so the funds can serve different roles.
What are the biggest shared holdings of IVOO and IWM?
The largest positions held by both funds are FN, NXT, STRL, HL and TTMI. Together the top 10 shared positions account for 24% of the total overlap.
What does IVOO own that IWM doesn't?
308 positions (81.8% of IVOO) are unique to IVOO, led by FLEX, TWLO and FTI. In the other direction, 1849 positions (81.0% of IWM) are unique to IWM.