IJH vs TSPS: 41% overlap
iShares Core S&P Mid-Cap ETF and TSP S Fund — shown via extended-market proxy share 41.4% 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 1.6. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
IJH and TSPS hold 403 of the same securities. The ten contributing most to the overlap figure:
| Holding | in IJH | in TSPS | Δ |
|---|---|---|---|
| TWLO | 0.8% | 0.4% | 0.4% |
| CRS | 0.8% | 0.3% | 0.5% |
| MKSI | 0.7% | 0.3% | 0.3% |
| CW | 0.8% | 0.3% | 0.5% |
| ENTG | 0.6% | 0.3% | 0.3% |
| NVT | 0.7% | 0.3% | 0.4% |
| ATI | 0.8% | 0.3% | 0.5% |
| ILMN | 0.8% | 0.3% | 0.5% |
| FTI | 0.8% | 0.3% | 0.5% |
| STRL | 0.6% | 0.3% | 0.3% |
Where IJH 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 | IJH | TSPS | Δ |
|---|---|---|---|
| Industrials | 25.5% | 19.8% | +5.7pp |
| Information Technology | 13.9% | 17.6% | −3.7pp |
| Cash and/or Derivatives | 0.1% | 3.8% | −3.7pp |
| Health Care | 10.0% | 13.2% | −3.2pp |
| Communication Services | 1.5% | 4.5% | −2.9pp |
| Real Estate | 6.9% | 4.8% | +2.1pp |
| Consumer Discretionary | 10.3% | 8.8% | +1.5pp |
| Materials | 5.5% | 4.1% | +1.4pp |
Δ is IJH 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
0.0% of IJH by weight, held in no part of TSPS.
54.8% of TSPS by weight, held in no part of IJH.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| IJH | TSPS | |
|---|---|---|
| Top 10 holdings | 7.6% | 10.6% |
| Positions held | 404 | 3,327 |
| 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 IJH and TSPS overlap?
IJH and TSPS overlap 41.4% by portfolio weight — moderate overlap. They share 403 holdings. The figure comes from current issuer holdings files (IJH as of 2026-07-23, TSPS as of 2026-06-30).
How is the overlap between IJH and TSPS calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If IJH 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 IJH and TSPS?
That depends on your goals — we state facts, not advice. At 41.4% overlap, each fund still contributes meaningfully distinct exposure.
What does IJH own that TSPS doesn't?
IJH holds 404 positions and TSPS holds 3,327; 0 of IJH's positions don't appear in TSPS at all, and they are 0.0% of IJH by weight.
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Related comparisons
Sources: issuer holdings files, IJH as of 2026-07-23, TSPS as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.