AIVSX vs FSKAX: 46% overlap
American Funds Investment Company of America A and Fidelity Total Market Index share 45.8% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
Different holding dates. These holdings were published 31 days apart — FSKAX as of 2026-02-28, the rest through 2026-03-31. 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
AIVSX and FSKAX hold 124 of the same securities. The ten contributing most to the overlap figure:
| Holding | in AIVSX | in FSKAX | Δ |
|---|---|---|---|
| NVDA | 6.5% | 6.5% | 0.1% |
| MSFT | 5.7% | 4.4% | 1.3% |
| AMZN | 4.7% | 3.1% | 1.7% |
| GOOGL | 2.5% | 2.7% | 0.2% |
| AVGO | 6.1% | 2.3% | 3.9% |
| AAPL | 2.2% | 5.9% | 3.6% |
| GOOG | 2.1% | 2.2% | 0.0% |
| META | 2.6% | 2.1% | 0.5% |
| LLY | 3.4% | 1.3% | 2.1% |
| JPM | 1.1% | 1.2% | 0.2% |
Where AIVSX and FSKAX 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 | FSKAX | Δ |
|---|---|---|---|
| Financials | 8.2% | 12.2% | −4.0pp |
| Industrials | 11.8% | 9.6% | +2.2pp |
| Real Estate | 0.8% | 2.4% | −1.6pp |
| Energy | 1.9% | 3.5% | −1.5pp |
| Unclassified | 5.5% | 4.0% | +1.5pp |
| Health Care | 11.2% | 9.8% | +1.4pp |
| Materials | 3.1% | 1.8% | +1.3pp |
| Consumer Staples | 6.4% | 5.1% | +1.3pp |
Δ is AIVSX minus FSKAX, 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
18.1% of AIVSX by weight, held in no part of FSKAX.
41.8% of FSKAX 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 | FSKAX | |
|---|---|---|
| Top 10 holdings | 39.5% | 32.1% |
| Positions held | 168 | 3,754 |
| Cost per $10,000 held, per year | $58 | $1 |
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 FSKAX overlap?
AIVSX and FSKAX overlap 45.8% by portfolio weight — moderate overlap. They share 124 holdings. The figure comes from current issuer holdings files (AIVSX as of 2026-03-31, FSKAX as of 2026-02-28).
How is the overlap between AIVSX and FSKAX 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 FSKAX 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 FSKAX?
That depends on your goals — we state facts, not advice. At 45.8% overlap, each fund still contributes meaningfully distinct exposure.
What does AIVSX own that FSKAX doesn't?
AIVSX holds 168 positions and FSKAX holds 3,754; 44 of AIVSX's positions don't appear in FSKAX at all, and they are 18.1% of AIVSX by weight.
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Related comparisons
Sources: issuer holdings files, AIVSX as of 2026-03-31, FSKAX as of 2026-02-28. Weights are fractions of each fund. Diagnostics, not advice.