IJR vs VBIAX: 2% overlap
iShares Core S&P Small-Cap ETF and Vanguard Balanced Index Admiral share 2.1% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
Different holding dates. These holdings were published about 4 months apart — VBIAX as of 2026-03-31, the rest through 2026-07-23. Each fund is compared using its most recent file, so any trading in between shows up as a difference.
You would hold two tickers and get the diversification of 2.0. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
IJR and VBIAX hold 117 of the same securities. The ten contributing most to the overlap figure:
| Holding | in IJR | in VBIAX | Δ |
|---|---|---|---|
| CASH | 2.1% | 1.8% | 0.3% |
| ESI | 0.5% | 0.0% | 0.5% |
| PAYC | 0.3% | 0.0% | 0.3% |
| BCPC | 0.3% | 0.0% | 0.3% |
| GVA | 0.3% | 0.0% | 0.3% |
| ACA | 0.4% | 0.0% | 0.4% |
| HCC | 0.2% | 0.0% | 0.2% |
| PECO | 0.3% | 0.0% | 0.3% |
| RAL | 0.4% | 0.0% | 0.4% |
| RDN | 0.2% | 0.0% | 0.2% |
Where IJR and VBIAX 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 | IJR | VBIAX | Δ |
|---|---|---|---|
| Unclassified | 0.0% | 55.1% | −55.1pp |
| Treasuries | 0.0% | 19.1% | −19.1pp |
| Industrials | 18.5% | 0.7% | +17.8pp |
| Financials | 17.8% | 3.6% | +14.2pp |
| Consumer Discretionary | 13.8% | 0.5% | +13.3pp |
| Information Technology | 12.1% | 1.0% | +11.2pp |
| Health Care | 10.5% | 1.2% | +9.3pp |
| MBS Pass-Through | 0.0% | 8.1% | −8.1pp |
Δ is IJR minus VBIAX, 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
78.7% of IJR by weight, held in no part of VBIAX.
98.8% of VBIAX by weight, held in no part of IJR.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| IJR | VBIAX | |
|---|---|---|
| Top 10 holdings | 6.6% | 45.2% |
| Positions held | 603 | 5,119 |
| Cost per $10,000 held, per year | $6 | $7 |
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 IJR and VBIAX overlap?
IJR and VBIAX overlap 2.1% by portfolio weight — largely distinct portfolios. They share 117 holdings. The figure comes from current issuer holdings files (IJR as of 2026-07-23, VBIAX as of 2026-03-31).
How is the overlap between IJR and VBIAX calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If IJR holds a stock at 6% and VBIAX 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 IJR and VBIAX?
That depends on your goals — we state facts, not advice. At 2.1% overlap, each fund still contributes meaningfully distinct exposure.
What does IJR own that VBIAX doesn't?
IJR holds 603 positions and VBIAX holds 5,119; 485 of IJR's positions don't appear in VBIAX at all, and they are 78.7% of IJR by weight.
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Related comparisons
Sources: issuer holdings files, IJR as of 2026-07-23, VBIAX as of 2026-03-31. Weights are fractions of each fund. Diagnostics, not advice.