AIVSX vs IWF: 40% overlap
American Funds Investment Company of America A and iShares Russell 1000 Growth ETF share 40.2% 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 4 months apart — AIVSX as of 2026-03-31, 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 1.6. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
AIVSX and IWF hold 55 of the same securities. The ten contributing most to the overlap figure:
| Holding | in AIVSX | in IWF | Δ |
|---|---|---|---|
| NVDA | 6.5% | 15.1% | 8.6% |
| AVGO | 6.1% | 5.7% | 0.5% |
| MSFT | 5.7% | 4.4% | 1.3% |
| LLY | 3.4% | 2.9% | 0.4% |
| META | 2.6% | 3.4% | 0.8% |
| GOOGL | 2.5% | 5.7% | 3.2% |
| AAPL | 2.2% | 7.8% | 5.6% |
| GOOG | 2.1% | 4.7% | 2.6% |
| AMAT | 1.3% | 1.4% | 0.1% |
| GE | 2.2% | 1.1% | 1.1% |
Where AIVSX and IWF 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 | AIVSX | IWF | Δ |
|---|---|---|---|
| Information Technology | 29.2% | 55.0% | −25.8pp |
| Communication Services | 9.9% | 15.7% | −5.8pp |
| Health Care | 11.2% | 5.6% | +5.7pp |
| Unclassified | 5.5% | 0.0% | +5.5pp |
| Consumer Staples | 6.4% | 1.3% | +5.0pp |
| Financials | 8.2% | 4.7% | +3.5pp |
| Industrials | 11.8% | 8.5% | +3.3pp |
| Materials | 3.1% | 0.3% | +2.8pp |
Δ is AIVSX minus IWF, 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
43.6% of AIVSX by weight, held in no part of IWF.
26.9% of IWF by weight, held in no part of AIVSX.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| AIVSX | IWF | |
|---|---|---|
| Top 10 holdings | 39.5% | 56.1% |
| Positions held | 168 | 370 |
| Cost per $10,000 held, per year | $58 | $19 |
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 AIVSX and IWF overlap?
AIVSX and IWF overlap 40.2% by portfolio weight — moderate overlap. They share 55 holdings. The figure comes from current issuer holdings files (AIVSX as of 2026-03-31, IWF as of 2026-07-23).
How is the overlap between AIVSX and IWF calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If AIVSX holds a stock at 6% and IWF 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 AIVSX and IWF?
That depends on your goals — we state facts, not advice. At 40.2% overlap, each fund still contributes meaningfully distinct exposure.
What does AIVSX own that IWF doesn't?
AIVSX holds 168 positions and IWF holds 370; 113 of AIVSX's positions don't appear in IWF at all, and they are 43.6% of AIVSX by weight.
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Related comparisons
Sources: issuer holdings files, AIVSX as of 2026-03-31, IWF as of 2026-07-23. Weights are fractions of each fund. Diagnostics, not advice.