TSPI vs VONG: 1% overlap
TSP I Fund — shown via international proxy and Vanguard Russell 1000 Growth ETF share 0.6% 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 VONG hold 26 of the same securities. The ten contributing most to the overlap figure:
| Holding | in TSPI | in VONG | Δ |
|---|---|---|---|
| CASH | 2.4% | 0.3% | 2.2% |
| HEI-A | 0.0% | 0.1% | 0.0% |
| HEI | 0.1% | 0.0% | 0.0% |
| QSR | 0.1% | 0.0% | 0.0% |
| BAM | 0.0% | 0.0% | 0.0% |
| AAL | 0.1% | 0.0% | 0.1% |
| H | 0.0% | 0.0% | 0.0% |
| MTN | 0.1% | 0.0% | 0.0% |
| ADP | 0.0% | 0.1% | 0.1% |
| EL | 0.1% | 0.0% | 0.1% |
Where TSPI and VONG 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 | VONG | Δ |
|---|---|---|---|
| Information Technology | 20.9% | 54.3% | −33.4pp |
| Financials | 19.7% | 4.3% | +15.4pp |
| Communication Services | 3.3% | 16.1% | −12.8pp |
| Unclassified | 9.1% | 0.0% | +9.1pp |
| Industrials | 13.8% | 8.8% | +5.0pp |
| Materials | 5.2% | 0.3% | +4.9pp |
| Consumer Staples | 4.9% | 1.3% | +3.6pp |
| Utilities | 3.0% | 0.3% | +2.7pp |
Δ is TSPI minus VONG, 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
96.9% of TSPI by weight, held in no part of VONG.
97.3% of VONG 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 | VONG | |
|---|---|---|
| Top 10 holdings | 16.3% | 54.3% |
| Positions held | 8,453 | 370 |
| Cost per $10,000 held, per year | $5 | $6 |
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 VONG overlap?
TSPI and VONG overlap 0.6% by portfolio weight — largely distinct portfolios. They share 26 holdings. The figure comes from current issuer holdings files (TSPI as of 2026-06-30, VONG as of 2026-06-30).
How is the overlap between TSPI and VONG 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 VONG 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 VONG?
That depends on your goals — we state facts, not advice. At 0.6% overlap, each fund still contributes meaningfully distinct exposure.
What does TSPI own that VONG doesn't?
TSPI holds 8,453 positions and VONG holds 370; 8,427 of TSPI's positions don't appear in VONG at all, and they are 96.9% of TSPI by weight.
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Related comparisons
Sources: issuer holdings files, TSPI as of 2026-06-30, VONG as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.