DIA vs IBB: Holdings Overlap
DIAState Street® SPDR® Dow Jones Industrial Average® ETF Trust
State Street (SPDR) · 30 holdings · $47.6B · as of 2026-08-06
iShares · 254 holdings · $9.3B · as of 2026-03-31
Holdings snapshots are 128 days apart (DIA: 2026-08-06, IBB: 2026-03-31). Weights and index membership change between snapshots, so the true current overlap is typically higher than shown. For funds tracking the same index, the gap can be 5–15 points.
How similar are DIA and IBB?
State Street® SPDR® Dow Jones Industrial Average® ETF Trust (DIA, by State Street (SPDR)) holds 30 positions; iShares Biotechnology ETF (IBB, by iShares) holds 254. They have 1 holdings in common, and by portfolio weight the two funds are 4.5% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 4.5%Sum of the smaller weight of each shared holding
- Shared Holdings
- 1DIA holds 30 · IBB holds 254
- Weight in Shared Holdings
- DIA 4%·IBB 8%Share of each fund's weight in stocks both funds own
Based on each fund's latest official holdings. How is this calculated?
What makes each fund different
Only in DIA
29 of 30 positions (95.5% of the fund) are not held by IBB.
Sector Breakdown
| Sector | DIA | IBB |
|---|---|---|
| Health Care | 13.2% | 91.0% |
| Financials | 27.4% | 0.0% |
| Information Technology | 17.3% | 0.0% |
| Industrials | 16.7% | 0.0% |
| Consumer Discretionary | 10.4% | 0.0% |
| Other Sectors | 15.0% | 0.0% |
| Unclassified | 0.0% | 8.9% |
Share of each fund's portfolio weight by GICS-style sector, compiled from issuer fund data and our own classification of the holdings, not the issuers' published sector charts. “Unclassified” is weight we could not classify (0% of DIA, 9% of IBB).
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| DIA | +2.1% | +13.2% | +24.6% | +16.9% | +10.8% | +13.5% | 1.33% |
| IBB | -0.3% | +17.3% | +51.0% | +16.4% | +3.1% | +7.4% | 0.21% |
Total returns including dividends, from adjusted daily closes as of 2026-08-07. 3Y/5Y/10Y are annualized. Yield is trailing-12-month distributions over the last close. Past performance does not predict future results.
Project the growth of $10,000 in DIA vs IBB →
Shared Holdings(1)
 AMGNAmgen Inc. COM | 4.46% | 7.51% | 4.46% |
|---|
Frequently Asked Questions
How much do DIA and IBB overlap?
DIA and IBB overlap by 4.5% of portfolio weight. They share 1 holdings (DIA holds 30 positions and IBB holds 254), based on each fund's latest SEC-reported holdings.
Is it redundant to own both DIA and IBB?
The two portfolios are 4.5% identical by weight. Owning both is genuine diversification: the funds hold almost none of the same securities.
What are the biggest shared holdings of DIA and IBB?
The largest positions held by both funds are AMGN. Together the top 1 shared positions account for 100% of the total overlap.
What does DIA own that IBB doesn't?
29 positions (95.5% of DIA) are unique to DIA, led by GS, CAT and MSFT. In the other direction, 253 positions (92.3% of IBB) are unique to IBB.