ABALX vs VBIAX: 9% overlap
American Funds American Balanced A and Vanguard Balanced Index Admiral share 8.9% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
You would hold two tickers and get the diversification of 1.9. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
ABALX and VBIAX hold 386 of the same securities. The ten contributing most to the overlap figure:
| Holding | in ABALX | in VBIAX | Δ |
|---|---|---|---|
| AGENCY-MBS | 2.7% | 8.1% | 5.3% |
| LLY | 1.3% | 0.7% | 0.6% |
| IBM | 0.4% | 0.2% | 0.2% |
| 46647P | 0.2% | 0.2% | 0.0% |
| 06051G | 0.2% | 0.2% | 0.0% |
| TMO | 0.3% | 0.2% | 0.1% |
| DIS | 0.2% | 0.2% | 0.1% |
| T | 0.2% | 0.2% | 0.0% |
| 68389X | 0.4% | 0.1% | 0.3% |
| 95000U | 0.2% | 0.1% | 0.1% |
Where ABALX 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 | ABALX | VBIAX | Δ |
|---|---|---|---|
| Unclassified | 22.7% | 55.1% | −32.4pp |
| Information Technology | 16.0% | 1.0% | +15.0pp |
| Treasuries | 12.3% | 19.1% | −6.9pp |
| Health Care | 6.7% | 1.2% | +5.5pp |
| MBS Pass-Through | 2.7% | 8.1% | −5.3pp |
| Financials | 8.9% | 3.6% | +5.3pp |
| Industrials | 6.0% | 0.7% | +5.2pp |
| Communication Services | 5.1% | 0.5% | +4.6pp |
Δ is ABALX 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
85.5% of ABALX by weight, held in no part of VBIAX.
82.1% of VBIAX by weight, held in no part of ABALX.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| ABALX | VBIAX | |
|---|---|---|
| Top 10 holdings | 36.3% | 45.2% |
| Positions held | 1,439 | 5,119 |
| Cost per $10,000 held, per year | $56 | $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 ABALX and VBIAX overlap?
ABALX and VBIAX overlap 8.9% by portfolio weight — largely distinct portfolios. They share 386 holdings. The figure comes from current issuer holdings files (ABALX as of 2026-03-31, VBIAX as of 2026-03-31).
How is the overlap between ABALX and VBIAX calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If ABALX 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 ABALX and VBIAX?
That depends on your goals — we state facts, not advice. At 8.9% overlap, each fund still contributes meaningfully distinct exposure.
What does ABALX own that VBIAX doesn't?
ABALX holds 1,439 positions and VBIAX holds 5,119; 1,052 of ABALX's positions don't appear in VBIAX at all, and they are 85.5% of ABALX by weight.
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Related comparisons
Sources: issuer holdings files, ABALX as of 2026-03-31, VBIAX as of 2026-03-31. Weights are fractions of each fund. Diagnostics, not advice.