TSPC vs TSPS: 0% overlap
TSP C Fund — shown via S&P 500 proxy and TSP S Fund — shown via extended-market proxy share 0.2% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
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
TSPC and TSPS hold 4 of the same securities. The ten contributing most to the overlap figure:
| Holding | in TSPC | in TSPS | Δ |
|---|---|---|---|
| CASH | 0.2% | 3.8% | 3.6% |
| CAG | 0.0% | 0.1% | 0.1% |
| FLEX | 0.1% | 0.0% | 0.1% |
| MRVL | 0.4% | 0.0% | 0.4% |
Where TSPC 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 | TSPC | TSPS | Δ |
|---|---|---|---|
| Information Technology | 38.0% | 17.6% | +20.4pp |
| Industrials | 8.9% | 19.8% | −10.9pp |
| Communication Services | 9.7% | 4.5% | +5.2pp |
| Health Care | 8.9% | 13.2% | −4.3pp |
| Cash and/or Derivatives | 0.2% | 3.8% | −3.6pp |
| Real Estate | 1.8% | 4.8% | −3.0pp |
| Financials | 11.6% | 13.9% | −2.3pp |
| Materials | 1.8% | 4.1% | −2.2pp |
Δ is TSPC 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
99.3% of TSPC by weight, held in no part of TSPS.
96.2% of TSPS by weight, held in no part of TSPC.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| TSPC | TSPS | |
|---|---|---|
| Top 10 holdings | 36.4% | 10.6% |
| Positions held | 505 | 3,327 |
| Cost per $10,000 held, per year | $5 | $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 TSPC and TSPS overlap?
TSPC and TSPS overlap 0.2% by portfolio weight — largely distinct portfolios. They share 4 holdings. The figure comes from current issuer holdings files (TSPC as of 2026-06-30, TSPS as of 2026-06-30).
How is the overlap between TSPC and TSPS calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If TSPC 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 TSPC and TSPS?
That depends on your goals — we state facts, not advice. At 0.2% overlap, each fund still contributes meaningfully distinct exposure.
What does TSPC own that TSPS doesn't?
TSPC holds 505 positions and TSPS holds 3,327; 501 of TSPC's positions don't appear in TSPS at all, and they are 99.3% of TSPC by weight.
You probably hold more than two funds
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Related comparisons
Sources: issuer holdings files, TSPC as of 2026-06-30, TSPS as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.