ETF and Mutual Fund Analysis

Holdings as of March 31, 2026

ETF and Mutual Fund Analysis

Overlap, Comparison, and Diversification for Your Portfolio

Home > Compare > VB vs VIIIX Holdings as of March 31, 2026

VB vs VIIIX: Portfolio Overlap

Vanguard Small-Cap Index Fund vs Vanguard Institutional Index Fund

3.4%
Weighted portfolio overlap
Low Overlap

Low Overlap. The two portfolios have highly distinct allocations: little of the weight sits in the same stocks.

VB
1312 equity holdings
as of March 31, 2026
VIIIX
503 equity holdings
as of March 31, 2026
122 stocks held in common
Overlap View Venn Diagram
3.4% OVERLAP VB VIIIX
Overlapping Holdings
10 Top 10 of 122 shared, by overlap contribution
# Stock VB VIIIX Overlap%
1
CIEN
 0.39% 0.10% 0.10%
2
LITE
 0.35% 0.09% 0.09%
3
FIX
 0.34% 0.09% 0.09%
4
COHR
 0.31% 0.08% 0.08%
5
EQT
 0.28% 0.07% 0.07%
6
EME
 0.46% 0.06% 0.06%
7
NRG
 0.44% 0.06% 0.06%
8
ATO
 0.43% 0.05% 0.05%
9
DOW
 0.21% 0.05% 0.05%
10
TPR
 0.40% 0.05% 0.05%
Most Divergent Holdings Stocks held by one fund but absent from the other
Only in VB — VANGUARD SMALL-CAP INDEX FUND
StockWeight
FTI0.39%
CASY0.38%
UTHR0.37%
NTRA0.37%
FTAI0.35%
Only in VIIIX — VANGUARD INSTITUTIONAL INDEX FUND
StockWeight
NVDA7.60%
AAPL6.68%
MSFT4.93%
AMZN3.65%
GOOGL3.00%

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Frequently Asked Questions (FAQs)
What is the portfolio overlap between VB and VIIIX?

VB (Vanguard Small-Cap Index Fund) and VIIIX (Vanguard Institutional Index Fund) share 3.4% portfolio overlap as of their March 31, 2026 filings, across 122 common stocks. Overlap is the sum of the smaller weight of each shared stock, so it reads as the share of a dollar that lands on the same companies in both funds.

Do VB and VIIIX invest in the same stocks?

Mostly not. Only a small portion of their portfolios overlaps — these funds hold largely different stocks and genuinely diversify each other.

What are the top stocks held by both VB and VIIIX?

The most prominent shared holdings (by combined weight) are: CIEN, LITE, FIX. See the full common-holdings table on this page for weights in each fund.

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