FSKAX vs TSPS: 11% overlap
Fidelity Total Market Index and TSP S Fund — shown via extended-market proxy share 11.0% 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 1.9. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
FSKAX and TSPS hold 2,758 of the same securities. The ten contributing most to the overlap figure:
| Holding | in FSKAX | in TSPS | Δ |
|---|---|---|---|
| CASH | 0.7% | 3.8% | 3.1% |
| SNOW | 0.1% | 1.0% | 0.9% |
| NET | 0.1% | 0.9% | 0.8% |
| FERG | 0.1% | 0.5% | 0.4% |
| LNG | 0.1% | 0.6% | 0.5% |
| RBLX | 0.1% | 0.4% | 0.3% |
| ALNY | 0.1% | 0.5% | 0.4% |
| MSTR | 0.1% | 0.3% | 0.3% |
| BE | 0.1% | 0.9% | 0.8% |
| RKLB | 0.0% | 0.6% | 0.5% |
Where FSKAX and TSPS 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 | TSPS | Δ |
|---|---|---|---|
| Information Technology | 29.9% | 17.6% | +12.2pp |
| Industrials | 9.6% | 19.8% | −10.2pp |
| Communication Services | 9.7% | 4.5% | +5.2pp |
| Health Care | 9.8% | 13.2% | −3.4pp |
| Cash and/or Derivatives | 0.7% | 3.8% | −3.1pp |
| Unclassified | 4.0% | 1.0% | +2.9pp |
| Real Estate | 2.4% | 4.8% | −2.4pp |
| Consumer Staples | 5.1% | 2.7% | +2.4pp |
Δ is FSKAX minus TSPS, 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
89.4% of FSKAX by weight, held in no part of TSPS.
8.5% of TSPS 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 | TSPS | |
|---|---|---|
| Top 10 holdings | 32.1% | 10.6% |
| Positions held | 3,754 | 3,327 |
| 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 TSPS overlap?
FSKAX and TSPS overlap 11.0% by portfolio weight — largely distinct portfolios. They share 2,758 holdings. The figure comes from current issuer holdings files (FSKAX as of 2026-02-28, TSPS as of 2026-06-30).
How is the overlap between FSKAX and TSPS 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 TSPS 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 TSPS?
That depends on your goals — we state facts, not advice. At 11.0% overlap, each fund still contributes meaningfully distinct exposure.
What does FSKAX own that TSPS doesn't?
FSKAX holds 3,754 positions and TSPS holds 3,327; 995 of FSKAX's positions don't appear in TSPS at all, and they are 89.4% of FSKAX by weight.
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Related comparisons
Sources: issuer holdings files, FSKAX as of 2026-02-28, TSPS as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.