VO vs VB: Holdings Overlap
Vanguard · 289 holdings · $109.2B · as of 2026-03-31
VBVanguard Small-cap Index Fund
Vanguard · 1312 holdings · $82.5B · as of 2026-03-31
How similar are VO and VB?
Vanguard Mid-cap Index Fund (VO, by Vanguard) holds 289 positions; Vanguard Small-cap Index Fund (VB, by Vanguard) holds 1312. They have 37 holdings in common, and by portfolio weight the two funds are 4.4% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 4.4%Sum of the smaller weight of each shared holding
- Shared Holdings
- 37VO holds 289 · VB holds 1312
- Weight in Shared Holdings
- VO 4%·VB 6%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 VO
252 of 289 positions (95.3% of the fund) are not held by VB. Showing the top 30 by weight.
Sector Breakdown
| Sector | VO | VB |
|---|---|---|
| Industrials | 18.4% | 21.2% |
| Information Technology | 14.2% | 13.8% |
| Financials | 13.8% | 13.4% |
| Health Care | 8.3% | 11.6% |
| Consumer Discretionary | 9.3% | 10.5% |
| Other Sectors | 35.7% | 28.5% |
| Unclassified | 0.0% | 0.7% |
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 VO, 1% of VB).
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| VO | +2.6% | +14.8% | +18.0% | +15.7% | +8.0% | +11.6% | 1.29% |
| VB | +2.5% | +19.5% | +29.1% | +15.9% | +8.1% | +11.3% | 1.18% |
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 VO vs VB →
Shared Holdings(37)
The top 10 shared positions account for 50% of the overlap, led by CIEN, LITE and FIX.
 CIENCiena Corporation COM NEW | 0.30% | 0.38% | 0.30% |
|---|---|---|---|
 LITELumentum Holdings Inc. COM | 0.27% | 0.35% | 0.27% |
 FIXComfort Systems USA Inc. COM | 0.26% | 0.34% | 0.26% |
 COHRCoherent Corp COM | 0.24% | 0.31% | 0.24% |
 EQTEQT Corporation COM | 0.22% | 0.28% | 0.22% |
 RKLBRocket Lab Corp. COM | 0.20% | 0.26% | 0.20% |
 BEBloom Energy Corporation COM CL A | 0.20% | 0.25% | 0.20% |
 INSMInsmed Inc COM PAR $.01 | 0.19% | 0.25% | 0.19% |
 DOWDow Inc COM | 0.16% | 0.21% | 0.16% |
 TPLTexas Pacific Land Corporation COM | 0.15% | 0.19% | 0.15% |
 HUBBHubbell Incorporated COM | 0.14% | 0.18% | 0.14% |
 STLDSteel Dynamics, Inc. COM | 0.14% | 0.17% | 0.14% |
 QQnity Electronics Inc. COMMON STOCK | 0.13% | 0.17% | 0.13% |
 NINiSource Inc. COM | 0.12% | 0.16% | 0.12% |
 LYBLyondellBasell Industries NV COM EUR0.04 CLASS 'A' | 0.11% | 0.15% | 0.11% |
 BURLBurlington Stores Inc. COM | 0.11% | 0.14% | 0.11% |
 FSLRFirst Solar Inc COM | 0.11% | 0.14% | 0.11% |
 LDOSLeidos Holdings Inc COM | 0.11% | 0.14% | 0.11% |
 EVRGEvergy Inc COM | 0.10% | 0.13% | 0.10% |
 WYWeyerhaeuser Company COM NEW | 0.10% | 0.12% | 0.10% |
 CNCCentene Corp. COM | 0.09% | 0.11% | 0.09% |
 CDWCDW Corp COM | 0.09% | 0.11% | 0.09% |
 ESSEssex Property Trust, Inc. COM | 0.09% | 0.11% | 0.09% |
 TRMBTrimble Inc COM | 0.08% | 0.11% | 0.08% |
 PODDInsulet Corporation COM | 0.08% | 0.10% | 0.08% |
Frequently Asked Questions
How much do VO and VB overlap?
VO and VB overlap by 4.4% of portfolio weight. They share 37 holdings (VO holds 289 positions and VB holds 1312), based on each fund's latest SEC-reported holdings.
Is it redundant to own both VO and VB?
The two portfolios are 4.4% identical by weight. Owning both is genuine diversification: the funds hold almost none of the same securities.
What are the biggest shared holdings of VO and VB?
The largest positions held by both funds are CIEN, LITE, FIX, COHR and EQT. Together the top 10 shared positions account for 50% of the total overlap.
What does VO own that VB doesn't?
252 positions (95.3% of VO) are unique to VO, led by VRT, HWM and WDC. In the other direction, 1275 positions (94.0% of VB) are unique to VB.