IJR vs SWTSX: 2% overlap
iShares Core S&P Small-Cap ETF and Schwab Total Stock Market Index share 2.5% 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 3 months apart — SWTSX as of 2026-04-30, the rest through 2026-07-23. 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 2.0. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
IJR and SWTSX hold 578 of the same securities. The ten contributing most to the overlap figure:
| Holding | in IJR | in SWTSX | Δ |
|---|---|---|---|
| CASH | 2.1% | 0.1% | 2.0% |
| FORM | 0.5% | 0.0% | 0.5% |
| ESI | 0.5% | 0.0% | 0.5% |
| PRIM | 0.3% | 0.0% | 0.3% |
| AGX | 0.5% | 0.0% | 0.5% |
| MTCH | 0.5% | 0.0% | 0.5% |
| VSAT | 0.6% | 0.0% | 0.6% |
| LUMN | 0.3% | 0.0% | 0.3% |
| ESE | 0.5% | 0.0% | 0.5% |
| EMN | 0.4% | 0.0% | 0.4% |
Where IJR and SWTSX 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 | IJR | SWTSX | Δ |
|---|---|---|---|
| Information Technology | 12.1% | 32.3% | −20.1pp |
| Industrials | 18.5% | 9.4% | +9.1pp |
| Communication Services | 3.6% | 10.1% | −6.5pp |
| Financials | 17.8% | 11.9% | +6.0pp |
| Consumer Discretionary | 13.8% | 9.6% | +4.2pp |
| Real Estate | 6.2% | 2.3% | +3.9pp |
| Unclassified | 0.0% | 3.4% | −3.4pp |
| Materials | 3.9% | 1.6% | +2.2pp |
Δ is IJR minus SWTSX, 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
4.0% of IJR by weight, held in no part of SWTSX.
97.3% of SWTSX by weight, held in no part of IJR.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| IJR | SWTSX | |
|---|---|---|
| Top 10 holdings | 6.6% | 33.9% |
| Positions held | 603 | 2,939 |
| Cost per $10,000 held, per year | $6 | $3 |
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 IJR and SWTSX overlap?
IJR and SWTSX overlap 2.5% by portfolio weight — largely distinct portfolios. They share 578 holdings. The figure comes from current issuer holdings files (IJR as of 2026-07-23, SWTSX as of 2026-04-30).
How is the overlap between IJR and SWTSX calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If IJR holds a stock at 6% and SWTSX 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 IJR and SWTSX?
That depends on your goals — we state facts, not advice. At 2.5% overlap, each fund still contributes meaningfully distinct exposure.
What does IJR own that SWTSX doesn't?
IJR holds 603 positions and SWTSX holds 2,939; 24 of IJR's positions don't appear in SWTSX at all, and they are 4.0% of IJR by weight.
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Related comparisons
Sources: issuer holdings files, IJR as of 2026-07-23, SWTSX as of 2026-04-30. Weights are fractions of each fund. Diagnostics, not advice.