IJR vs TSPS: 23% overlap
iShares Core S&P Small-Cap ETF and TSP S Fund — shown via extended-market proxy share 22.6% 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 1.8. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
IJR and TSPS hold 600 of the same securities. The ten contributing most to the overlap figure:
| Holding | in IJR | in TSPS | Δ |
|---|---|---|---|
| CASH | 2.1% | 3.8% | 1.7% |
| FORM | 0.5% | 0.1% | 0.4% |
| VSAT | 0.6% | 0.1% | 0.4% |
| AGX | 0.5% | 0.1% | 0.3% |
| ESI | 0.5% | 0.1% | 0.4% |
| MXL | 0.4% | 0.1% | 0.3% |
| ESE | 0.5% | 0.1% | 0.4% |
| MTCH | 0.5% | 0.1% | 0.4% |
| ALKS | 0.5% | 0.1% | 0.4% |
| ECG | 0.4% | 0.1% | 0.3% |
Where IJR and TSPS 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 | TSPS | Δ |
|---|---|---|---|
| Information Technology | 12.1% | 17.6% | −5.5pp |
| Consumer Discretionary | 13.8% | 8.8% | +5.0pp |
| Financials | 17.8% | 13.9% | +3.9pp |
| Health Care | 10.5% | 13.2% | −2.7pp |
| Cash and/or Derivatives | 2.1% | 3.8% | −1.7pp |
| Real Estate | 6.2% | 4.8% | +1.4pp |
| Industrials | 18.5% | 19.8% | −1.3pp |
| Energy | 5.3% | 4.0% | +1.3pp |
Δ is IJR minus TSPS, 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
0.5% of IJR by weight, held in no part of TSPS.
75.5% of TSPS 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 | TSPS | |
|---|---|---|
| Top 10 holdings | 6.6% | 10.6% |
| Positions held | 603 | 3,327 |
| Cost per $10,000 held, per year | $6 | $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 IJR and TSPS overlap?
IJR and TSPS overlap 22.6% by portfolio weight — moderate overlap. They share 600 holdings. The figure comes from current issuer holdings files (IJR as of 2026-07-23, TSPS as of 2026-06-30).
How is the overlap between IJR and TSPS 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 TSPS 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 TSPS?
That depends on your goals — we state facts, not advice. At 22.6% overlap, each fund still contributes meaningfully distinct exposure.
What does IJR own that TSPS doesn't?
IJR holds 603 positions and TSPS holds 3,327; 2 of IJR's positions don't appear in TSPS at all, and they are 0.5% of IJR by weight.
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Related comparisons
Sources: issuer holdings files, IJR as of 2026-07-23, TSPS as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.