TSPC vs VTSAX: 88% overlap
TSP C Fund — shown via S&P 500 proxy and Vanguard Total Stock Market Index Admiral share 87.9% 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 1.1. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
TSPC and VTSAX hold 503 of the same securities. The ten contributing most to the overlap figure:
| Holding | in TSPC | in VTSAX | Δ |
|---|---|---|---|
| NVDA | 7.5% | 6.3% | 1.2% |
| AAPL | 6.6% | 5.8% | 0.7% |
| MSFT | 4.3% | 3.8% | 0.5% |
| AMZN | 3.6% | 3.2% | 0.4% |
| GOOGL | 3.2% | 2.9% | 0.4% |
| AVGO | 2.8% | 2.5% | 0.3% |
| GOOG | 2.6% | 2.3% | 0.3% |
| MU | 2.0% | 1.8% | 0.2% |
| META | 1.9% | 1.7% | 0.2% |
| TSLA | 1.8% | 1.6% | 0.2% |
Where TSPC 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 | TSPC | VTSAX | Δ |
|---|---|---|---|
| Information Technology | 38.0% | 35.2% | +2.8pp |
| Industrials | 8.9% | 10.4% | −1.5pp |
| Health Care | 8.9% | 9.5% | −0.7pp |
| Communication Services | 9.7% | 9.1% | +0.6pp |
| Cash and/or Derivatives | 0.2% | 0.6% | −0.4pp |
| Real Estate | 1.8% | 2.2% | −0.4pp |
| Financials | 11.6% | 11.9% | −0.3pp |
| Consumer Staples | 4.6% | 4.3% | +0.2pp |
Δ is TSPC 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
0.1% of TSPC by weight, held in no part of VTSAX.
11.6% of VTSAX 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 | VTSAX | |
|---|---|---|
| Top 10 holdings | 36.4% | 31.9% |
| Positions held | 505 | 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 TSPC and VTSAX overlap?
TSPC and VTSAX overlap 87.9% by portfolio weight — substantial duplication if you hold both. They share 503 holdings. The figure comes from current issuer holdings files (TSPC as of 2026-06-30, VTSAX as of 2026-06-30).
How is the overlap between TSPC and VTSAX 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 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 TSPC and VTSAX?
That depends on your goals — we state facts, not advice. At 87.9% overlap, most of what one fund holds, the other holds too. Expense ratios: TSPC 0.05% versus VTSAX 0.04%.
What does TSPC own that VTSAX doesn't?
TSPC holds 505 positions and VTSAX holds 3,495; 2 of TSPC's positions don't appear in VTSAX at all, and they are 0.1% of TSPC by weight.
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Sources: issuer holdings files, TSPC as of 2026-06-30, VTSAX as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.