TSPS vs VIMAX: 9% overlap
TSP S Fund — shown via extended-market proxy and Vanguard Mid-Cap Index Admiral share 8.6% 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 1.9. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
TSPS and VIMAX hold 34 of the same securities. The ten contributing most to the overlap figure:
| Holding | in TSPS | in VIMAX | Δ |
|---|---|---|---|
| BE | 0.9% | 0.8% | 0.1% |
| NET | 0.9% | 0.8% | 0.1% |
| RKLB | 0.6% | 0.6% | 0.0% |
| LNG | 0.6% | 0.5% | 0.1% |
| CASH | 3.8% | 0.5% | 3.3% |
| FERG | 0.5% | 0.4% | 0.1% |
| SNOW | 1.0% | 0.4% | 0.6% |
| ALNY | 0.5% | 0.4% | 0.1% |
| ALAB | 0.7% | 0.4% | 0.4% |
| RBLX | 0.4% | 0.3% | 0.1% |
Where TSPS and VIMAX 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 | TSPS | VIMAX | Δ |
|---|---|---|---|
| Utilities | 1.9% | 8.4% | −6.5pp |
| Health Care | 13.2% | 7.8% | +5.4pp |
| Energy | 4.0% | 7.3% | −3.3pp |
| Cash and/or Derivatives | 3.8% | 0.5% | +3.3pp |
| Consumer Staples | 2.7% | 4.9% | −2.2pp |
| Communication Services | 4.5% | 2.8% | +1.7pp |
| Information Technology | 17.6% | 16.1% | +1.5pp |
| Unclassified | 1.0% | 0.4% | +0.6pp |
Δ is TSPS minus VIMAX, 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
85.4% of TSPS by weight, held in no part of VIMAX.
91.1% of VIMAX by weight, held in no part of TSPS.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| TSPS | VIMAX | |
|---|---|---|
| Top 10 holdings | 10.6% | 9.5% |
| Positions held | 3,327 | 283 |
| 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 TSPS and VIMAX overlap?
TSPS and VIMAX overlap 8.6% by portfolio weight — largely distinct portfolios. They share 34 holdings. The figure comes from current issuer holdings files (TSPS as of 2026-06-30, VIMAX as of 2026-06-30).
How is the overlap between TSPS and VIMAX calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If TSPS holds a stock at 6% and VIMAX 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 TSPS and VIMAX?
That depends on your goals — we state facts, not advice. At 8.6% overlap, each fund still contributes meaningfully distinct exposure.
What does TSPS own that VIMAX doesn't?
TSPS holds 3,327 positions and VIMAX holds 283; 3,293 of TSPS's positions don't appear in VIMAX at all, and they are 85.4% of TSPS by weight.
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Related comparisons
Sources: issuer holdings files, TSPS as of 2026-06-30, VIMAX as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.