SWTSX vs TSPC: 85% overlap
Schwab Total Stock Market Index and TSP C Fund — shown via S&P 500 proxy share 84.8% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
Different holding dates. These holdings were published about 2 months apart — SWTSX as of 2026-04-30, the rest through 2026-06-30. Each fund is compared using its most recent file, so any trading in between shows up as a difference.
You would hold two tickers and get the diversification of 1.2. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
SWTSX and TSPC hold 471 of the same securities. The ten contributing most to the overlap figure:
| Holding | in SWTSX | in TSPC | Δ |
|---|---|---|---|
| NVDA | 6.9% | 7.5% | 0.6% |
| AAPL | 5.7% | 6.6% | 0.9% |
| MSFT | 4.3% | 4.3% | 0.0% |
| AMZN | 3.7% | 3.6% | 0.1% |
| GOOGL | 3.2% | 3.2% | 0.0% |
| AVGO | 2.8% | 2.8% | 0.1% |
| GOOG | 2.6% | 2.6% | 0.0% |
| META | 1.9% | 1.9% | 0.0% |
| TSLA | 1.5% | 1.8% | 0.3% |
| BRK-B | 1.2% | 1.4% | 0.2% |
Where SWTSX and TSPC 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 | SWTSX | TSPC | Δ |
|---|---|---|---|
| Information Technology | 32.3% | 38.0% | −5.7pp |
| Unclassified | 3.4% | 0.0% | +3.4pp |
| Energy | 3.5% | 3.0% | +0.5pp |
| Real Estate | 2.3% | 1.8% | +0.5pp |
| Industrials | 9.4% | 8.9% | +0.5pp |
| Communication Services | 10.1% | 9.7% | +0.5pp |
| Financials | 11.9% | 11.6% | +0.3pp |
| Consumer Discretionary | 9.6% | 9.3% | +0.3pp |
Δ is SWTSX minus TSPC, 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
13.7% of SWTSX by weight, held in no part of TSPC.
3.0% of TSPC by weight, held in no part of SWTSX.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| SWTSX | TSPC | |
|---|---|---|
| Top 10 holdings | 33.9% | 36.4% |
| Positions held | 2,939 | 505 |
| Cost per $10,000 held, per year | $3 | $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 SWTSX and TSPC overlap?
SWTSX and TSPC overlap 84.8% by portfolio weight — substantial duplication if you hold both. They share 471 holdings. The figure comes from current issuer holdings files (SWTSX as of 2026-04-30, TSPC as of 2026-06-30).
How is the overlap between SWTSX and TSPC calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If SWTSX holds a stock at 6% and TSPC 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 SWTSX and TSPC?
That depends on your goals — we state facts, not advice. At 84.8% overlap, most of what one fund holds, the other holds too. Expense ratios: SWTSX 0.03% versus TSPC 0.05%.
What does SWTSX own that TSPC doesn't?
SWTSX holds 2,939 positions and TSPC holds 505; 2,467 of SWTSX's positions don't appear in TSPC at all, and they are 13.7% of SWTSX by weight.
You probably hold more than two funds
This page compares SWTSX and TSPC. Paste your whole portfolio — brokerage, 401(k), IRA — and see the overlap across every fund at once, plus what you actually own underneath them and your own Effective Funds number. Free, no account, nothing stored.
X-ray my portfolio — free →Watch SWTSX vs TSPC
We re-read both funds’ published holdings every weeknight. Leave an address and we'll tell you when what's inside actually changes.
Not sending yet — email alerts are built but switched off, and you'll be among the first when they turn on. No spam, one-click unsubscribe.
Related comparisons
Sources: issuer holdings files, SWTSX as of 2026-04-30, TSPC as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.