FSKAX vs TSPI: 2% overlap
Fidelity Total Market Index and TSP I Fund — shown via international proxy share 1.8% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
Different holding dates. These holdings were published about 4 months apart — FSKAX as of 2026-02-28, the rest through 2026-06-30. 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 2.0. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
FSKAX and TSPI hold 178 of the same securities. The ten contributing most to the overlap figure:
| Holding | in FSKAX | in TSPI | Δ |
|---|---|---|---|
| CASH | 0.7% | 2.4% | 1.7% |
| ROP | 0.1% | 0.6% | 0.6% |
| PRU | 0.1% | 0.1% | 0.0% |
| DG | 0.1% | 0.2% | 0.1% |
| ALL | 0.1% | 0.1% | 0.0% |
| MRK | 0.5% | 0.0% | 0.4% |
| DTE | 0.0% | 0.2% | 0.2% |
| HBAN | 0.1% | 0.0% | 0.0% |
| TSCO | 0.0% | 0.1% | 0.0% |
| EQT | 0.1% | 0.0% | 0.0% |
Where FSKAX and TSPI 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 | FSKAX | TSPI | Δ |
|---|---|---|---|
| Information Technology | 29.9% | 20.9% | +9.0pp |
| Financials | 12.2% | 19.7% | −7.5pp |
| Communication Services | 9.7% | 3.3% | +6.4pp |
| Unclassified | 4.0% | 9.1% | −5.2pp |
| Health Care | 9.8% | 5.3% | +4.5pp |
| Industrials | 9.6% | 13.8% | −4.2pp |
| Materials | 1.8% | 5.2% | −3.4pp |
| Consumer Discretionary | 9.6% | 7.5% | +2.1pp |
Δ is FSKAX minus TSPI, 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
95.1% of FSKAX by weight, held in no part of TSPI.
93.4% of TSPI by weight, held in no part of FSKAX.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| FSKAX | TSPI | |
|---|---|---|
| Top 10 holdings | 32.1% | 16.3% |
| Positions held | 3,754 | 8,453 |
| Cost per $10,000 held, per year | $1 | $5 |
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 FSKAX and TSPI overlap?
FSKAX and TSPI overlap 1.8% by portfolio weight — largely distinct portfolios. They share 178 holdings. The figure comes from current issuer holdings files (FSKAX as of 2026-02-28, TSPI as of 2026-06-30).
How is the overlap between FSKAX and TSPI calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If FSKAX holds a stock at 6% and TSPI 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 FSKAX and TSPI?
That depends on your goals — we state facts, not advice. At 1.8% overlap, each fund still contributes meaningfully distinct exposure.
What does FSKAX own that TSPI doesn't?
FSKAX holds 3,754 positions and TSPI holds 8,453; 3,575 of FSKAX's positions don't appear in TSPI at all, and they are 95.1% of FSKAX by weight.
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Related comparisons
Sources: issuer holdings files, FSKAX as of 2026-02-28, TSPI as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.