AGTHX vs DIA: 19% overlap
American Funds Growth Fund of America A and SPDR Dow Jones Industrial Average ETF share 18.6% 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 5 months apart — AGTHX as of 2026-02-28, 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 1.8. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
AGTHX and DIA hold 23 of the same securities. The ten contributing most to the overlap figure:
| Holding | in AGTHX | in DIA | Δ |
|---|---|---|---|
| MSFT | 4.0% | 4.4% | 0.4% |
| GOOGL | 2.9% | 3.6% | 0.7% |
| AMZN | 2.9% | 2.7% | 0.2% |
| NVDA | 6.1% | 2.4% | 3.7% |
| AAPL | 1.8% | 3.7% | 1.9% |
| V | 0.8% | 4.0% | 3.2% |
| BA | 0.5% | 2.4% | 1.9% |
| AMGN | 0.5% | 4.3% | 3.8% |
| CAT | 0.5% | 10.3% | 9.8% |
| CRM | 0.4% | 1.8% | 1.4% |
Where AGTHX and DIA 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 | AGTHX | DIA | Δ |
|---|---|---|---|
| Financials | 6.5% | 28.6% | −22.1pp |
| Information Technology | 30.6% | 15.9% | +14.6pp |
| Communication Services | 13.2% | 4.7% | +8.5pp |
| Industrials | 9.8% | 17.5% | −7.6pp |
| Unclassified | 7.6% | 0.0% | +7.6pp |
| Consumer Discretionary | 12.7% | 9.9% | +2.8pp |
| Health Care | 11.0% | 13.6% | −2.6pp |
| Materials | 1.5% | 3.6% | −2.0pp |
Δ is AGTHX minus DIA, 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
76.5% of AGTHX by weight, held in no part of DIA.
15.5% of DIA by weight, held in no part of AGTHX.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| AGTHX | DIA | |
|---|---|---|
| Top 10 holdings | 36.7% | 56.2% |
| Positions held | 309 | 31 |
| Cost per $10,000 held, per year | $61 | $16 |
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 AGTHX and DIA overlap?
AGTHX and DIA overlap 18.6% by portfolio weight — moderate overlap. They share 23 holdings. The figure comes from current issuer holdings files (AGTHX as of 2026-02-28, DIA as of 2026-07-23).
How is the overlap between AGTHX and DIA calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If AGTHX holds a stock at 6% and DIA 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 AGTHX and DIA?
That depends on your goals — we state facts, not advice. At 18.6% overlap, each fund still contributes meaningfully distinct exposure.
What does AGTHX own that DIA doesn't?
AGTHX holds 309 positions and DIA holds 31; 285 of AGTHX's positions don't appear in DIA at all, and they are 76.5% of AGTHX by weight.
You probably hold more than two funds
This page compares AGTHX and DIA. Paste your whole portfolio — brokerage, 401(k), IRA — and see the overlap across every fund at once, plus what you actually own underneath them and your own Effective Funds number. Free, no account, nothing stored.
X-ray my portfolio — free →Watch AGTHX vs DIA
We re-read both funds’ published holdings every weeknight. Leave an address and we'll tell you when what's inside actually changes.
Not sending yet — email alerts are built but switched off, and you'll be among the first when they turn on. No spam, one-click unsubscribe.
Related comparisons
Sources: issuer holdings files, AGTHX as of 2026-02-28, DIA as of 2026-07-23. Weights are fractions of each fund. Diagnostics, not advice.