ABALX vs MGK: 19% overlap
American Funds American Balanced A and Vanguard Mega Cap Growth ETF share 19.1% 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 3 months apart — ABALX as of 2026-03-31, the rest through 2026-06-30. 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 1.8. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
ABALX and MGK hold 26 of the same securities. The ten contributing most to the overlap figure:
| Holding | in ABALX | in MGK | Δ |
|---|---|---|---|
| AVGO | 3.4% | 4.3% | 0.9% |
| NVDA | 2.0% | 13.2% | 11.2% |
| MSFT | 2.0% | 7.5% | 5.5% |
| GOOGL | 1.7% | 5.9% | 4.2% |
| GOOG | 1.4% | 4.6% | 3.2% |
| LLY | 1.3% | 3.4% | 2.1% |
| V | 1.0% | 1.8% | 0.8% |
| AMZN | 0.8% | 4.4% | 3.6% |
| META | 0.7% | 4.1% | 3.3% |
| AAPL | 0.6% | 12.1% | 11.5% |
Where ABALX and MGK 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 | MGK | Δ |
|---|---|---|---|
| Information Technology | 16.0% | 58.6% | −42.6pp |
| Unclassified | 22.7% | 0.0% | +22.7pp |
| Treasuries | 12.3% | 0.0% | +12.3pp |
| Communication Services | 5.1% | 16.2% | −11.1pp |
| Consumer Discretionary | 4.7% | 11.2% | −6.5pp |
| Financials | 8.9% | 4.0% | +4.9pp |
| Consumer Staples | 4.4% | 0.4% | +4.0pp |
| Corporate — industrial & other | 3.6% | 0.0% | +3.6pp |
Δ is ABALX minus MGK, 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
81.1% of ABALX by weight, held in no part of MGK.
22.7% of MGK 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 | MGK | |
|---|---|---|
| Top 10 holdings | 36.3% | 63.5% |
| Positions held | 1,439 | 57 |
| Cost per $10,000 held, per year | $56 | $5 |
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 MGK overlap?
ABALX and MGK overlap 19.1% by portfolio weight — moderate overlap. They share 26 holdings. The figure comes from current issuer holdings files (ABALX as of 2026-03-31, MGK as of 2026-06-30).
How is the overlap between ABALX and MGK 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 MGK 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 MGK?
That depends on your goals — we state facts, not advice. At 19.1% overlap, each fund still contributes meaningfully distinct exposure.
What does ABALX own that MGK doesn't?
ABALX holds 1,439 positions and MGK holds 57; 1,412 of ABALX's positions don't appear in MGK at all, and they are 81.1% of ABALX by weight.
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Related comparisons
Sources: issuer holdings files, ABALX as of 2026-03-31, MGK as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.