FXAIX vs RGAGX: 50% overlap
Fidelity 500 Index and American Funds Growth Fund of America R6 share 49.8% 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 1.5. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
FXAIX and RGAGX hold 162 of the same securities. The ten contributing most to the overlap figure:
| Holding | in FXAIX | in RGAGX | Δ |
|---|---|---|---|
| NVDA | 7.3% | 6.1% | 1.3% |
| MSFT | 5.0% | 4.0% | 0.9% |
| GOOGL | 3.1% | 2.9% | 0.2% |
| AMZN | 3.5% | 2.9% | 0.6% |
| AVGO | 2.6% | 4.3% | 1.7% |
| GOOG | 2.5% | 2.9% | 0.5% |
| META | 2.4% | 4.2% | 1.9% |
| TSLA | 1.9% | 2.6% | 0.7% |
| AAPL | 6.6% | 1.8% | 4.8% |
| LLY | 1.4% | 3.3% | 1.9% |
Where FXAIX and RGAGX 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 | FXAIX | RGAGX | Δ |
|---|---|---|---|
| Financials | 12.0% | 6.5% | +5.5pp |
| Unclassified | 3.3% | 7.6% | −4.3pp |
| Consumer Discretionary | 9.7% | 12.7% | −3.0pp |
| Consumer Staples | 5.4% | 2.4% | +2.9pp |
| Communication Services | 10.5% | 13.2% | −2.7pp |
| Utilities | 2.4% | 0.5% | +1.9pp |
| Energy | 3.4% | 1.9% | +1.5pp |
| Industrials | 8.3% | 9.8% | −1.5pp |
Δ is FXAIX minus RGAGX, 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
26.2% of FXAIX by weight, held in no part of RGAGX.
26.3% of RGAGX by weight, held in no part of FXAIX.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| FXAIX | RGAGX | |
|---|---|---|
| Top 10 holdings | 36.4% | 36.7% |
| Positions held | 506 | 309 |
| Cost per $10,000 held, per year | $1 | $30 |
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 FXAIX and RGAGX overlap?
FXAIX and RGAGX overlap 49.8% by portfolio weight — moderate overlap. They share 162 holdings. The figure comes from current issuer holdings files (FXAIX as of 2026-02-28, RGAGX as of 2026-02-28).
How is the overlap between FXAIX and RGAGX calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If FXAIX holds a stock at 6% and RGAGX 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 FXAIX and RGAGX?
That depends on your goals — we state facts, not advice. At 49.8% overlap, each fund still contributes meaningfully distinct exposure.
What does FXAIX own that RGAGX doesn't?
FXAIX holds 506 positions and RGAGX holds 309; 343 of FXAIX's positions don't appear in RGAGX at all, and they are 26.2% of FXAIX by weight.
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Related comparisons
Sources: issuer holdings files, FXAIX as of 2026-02-28, RGAGX as of 2026-02-28. Weights are fractions of each fund. Diagnostics, not advice.