TSPI vs VTSAX: 2% overlap
TSP I Fund — shown via international proxy and Vanguard Total Stock Market Index Admiral share 2.0% 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
TSPI and VTSAX hold 212 of the same securities. The ten contributing most to the overlap figure:
| Holding | in TSPI | in VTSAX | Δ |
|---|---|---|---|
| CASH | 2.4% | 0.6% | 1.8% |
| WCN | 0.1% | 0.1% | 0.0% |
| PRU | 0.1% | 0.1% | 0.0% |
| ALL | 0.1% | 0.1% | 0.0% |
| MRK | 0.0% | 0.4% | 0.4% |
| ROP | 0.6% | 0.0% | 0.6% |
| HBAN | 0.0% | 0.0% | 0.0% |
| SUNB | 0.1% | 0.0% | 0.0% |
| DTE | 0.2% | 0.0% | 0.2% |
| PPL | 0.1% | 0.0% | 0.0% |
Where TSPI and VTSAX 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 | TSPI | VTSAX | Δ |
|---|---|---|---|
| Information Technology | 20.9% | 35.2% | −14.3pp |
| Unclassified | 9.1% | 0.2% | +8.9pp |
| Financials | 19.7% | 11.9% | +7.8pp |
| Communication Services | 3.3% | 9.1% | −5.8pp |
| Health Care | 5.3% | 9.5% | −4.3pp |
| Industrials | 13.8% | 10.4% | +3.4pp |
| Materials | 5.2% | 2.0% | +3.1pp |
| Cash and/or Derivatives | 2.5% | 0.6% | +1.8pp |
Δ is TSPI minus VTSAX, 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
91.7% of TSPI by weight, held in no part of VTSAX.
94.3% of VTSAX by weight, held in no part of TSPI.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| TSPI | VTSAX | |
|---|---|---|
| Top 10 holdings | 16.3% | 31.9% |
| Positions held | 8,453 | 3,495 |
| Cost per $10,000 held, per year | $5 | $4 |
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 TSPI and VTSAX overlap?
TSPI and VTSAX overlap 2.0% by portfolio weight — largely distinct portfolios. They share 212 holdings. The figure comes from current issuer holdings files (TSPI as of 2026-06-30, VTSAX as of 2026-06-30).
How is the overlap between TSPI and VTSAX calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If TSPI holds a stock at 6% and VTSAX 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 TSPI and VTSAX?
That depends on your goals — we state facts, not advice. At 2.0% overlap, each fund still contributes meaningfully distinct exposure.
What does TSPI own that VTSAX doesn't?
TSPI holds 8,453 positions and VTSAX holds 3,495; 8,241 of TSPI's positions don't appear in VTSAX at all, and they are 91.7% of TSPI by weight.
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Related comparisons
Sources: issuer holdings files, TSPI as of 2026-06-30, VTSAX as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.