IVV vs RGAGX: 50% overlap
iShares Core S&P 500 ETF and American Funds Growth Fund of America R6 share 49.5% 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 — RGAGX 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 1.5. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
IVV and RGAGX hold 170 of the same securities. The ten contributing most to the overlap figure:
| Holding | in IVV | in RGAGX | Δ |
|---|---|---|---|
| NVDA | 7.9% | 6.1% | 1.9% |
| MSFT | 4.4% | 4.0% | 0.4% |
| GOOGL | 2.9% | 2.9% | 0.0% |
| AVGO | 2.9% | 4.3% | 1.4% |
| AMZN | 3.6% | 2.9% | 0.7% |
| GOOG | 2.4% | 2.9% | 0.6% |
| META | 2.1% | 4.2% | 2.2% |
| AAPL | 7.4% | 1.8% | 5.6% |
| MU | 1.8% | 1.8% | 0.0% |
| LLY | 1.5% | 3.3% | 1.9% |
Where IVV 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 | IVV | RGAGX | Δ |
|---|---|---|---|
| Unclassified | 0.0% | 7.6% | −7.6pp |
| Information Technology | 37.5% | 30.6% | +6.9pp |
| Financials | 12.3% | 6.5% | +5.8pp |
| Communication Services | 9.3% | 13.2% | −4.0pp |
| Consumer Discretionary | 8.7% | 12.7% | −3.9pp |
| Consumer Staples | 4.6% | 2.4% | +2.2pp |
| Health Care | 9.1% | 11.0% | −1.8pp |
| Utilities | 2.3% | 0.5% | +1.8pp |
Δ is IVV 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
24.9% of IVV by weight, held in no part of RGAGX.
24.1% of RGAGX by weight, held in no part of IVV.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| IVV | RGAGX | |
|---|---|---|
| Top 10 holdings | 36.8% | 36.7% |
| Positions held | 506 | 309 |
| Cost per $10,000 held, per year | $3 | $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 IVV and RGAGX overlap?
IVV and RGAGX overlap 49.5% by portfolio weight — moderate overlap. They share 170 holdings. The figure comes from current issuer holdings files (IVV as of 2026-07-23, RGAGX as of 2026-02-28).
How is the overlap between IVV and RGAGX calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If IVV 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 IVV and RGAGX?
That depends on your goals — we state facts, not advice. At 49.5% overlap, each fund still contributes meaningfully distinct exposure.
What does IVV own that RGAGX doesn't?
IVV holds 506 positions and RGAGX holds 309; 335 of IVV's positions don't appear in RGAGX at all, and they are 24.9% of IVV by weight.
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Related comparisons
Sources: issuer holdings files, IVV as of 2026-07-23, RGAGX as of 2026-02-28. Weights are fractions of each fund. Diagnostics, not advice.