Data as of Sep 13, 2026. Both funds on the fields they both publish, from the same sources.
DIA vs IBB: how they differ
DIA and IBB hold 0% of their weight in the same names, and IBB returned more over the year.
SPDR Dow Jones Industrial Average ETF Trust and iShares Biotechnology ETF.
What they hold in common
By the books each fund has filed, DIA and IBB hold 0% of their money in the same securities at the same weight.
| Only in DIA | Only in IBB |
|---|---|
| GOLDMAN SACHS GROUP INC 11.61% | VERTEX PHARMACEUTICALS 7.94% |
| CATERPILLAR INC 9.17% | AMGEN INC 7.85% |
| MICROSOFT CORP 5.61% | GILEAD SCIENCES 7.44% |
| UNITEDHEALTH GROUP INC 4.42% | REGENERON PHARMACEUTICALS 5.92% |
| AMGEN INC 4.36% | ARGENX SE ADR 3.78% |
| TRAVELERS COS INC/THE 4.19% | MODERNA 3.67% |
| VISA INC CLASS A SHARES 4.18% | NATERA 3.30% |
| JPMORGAN CHASE + CO 4.03% | REVOLUTION MEDICINES 2.87% |
Weight overlap is an ETFIQ calculation: for every security both funds hold, the smaller of the two weights, summed. Above 50%, holding both is close to holding one of them twice. Holdings dated Sep 10, 2026.
| DIA SPDR Dow Jones Industrial Average ETF Trust | IBB iShares Biotechnology ETF | |
|---|---|---|
| Where it sits | Core index fund | Core index fund |
| Issuer | State Street | iShares |
| What it is | Dow Jones Industrial Average | Biotechnology |
| Total return, 1 year | +15.6% | +41.5% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | −1.9 pts | +24.0 pts |
| Expense ratio | not published | 0.44% |
| Already in the S&P 500 | 97.1% | 35.6% |
| Holdings | 31 | 233 |
DIA in plain words
DIA is an index equity fund tracking the Dow Jones Industrial Average. Over the year to Sep 11, 2026 it returned +15.6% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. By its holdings filed for Sep 10, 2026, 97% of the fund by weight is stocks the S&P 500 also holds, across 31 positions, with the top ten at 55.1%. It sat 3.1% below its high of Aug 5, 2026 on Sep 11, 2026.
IBB in plain words
IBB is an index equity fund tracking the Biotechnology. Over the year to Sep 11, 2026 it returned +41.5% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.44% a year. By its holdings filed for Sep 10, 2026, 36% of the fund by weight is stocks the S&P 500 also holds, across 233 positions, with the top ten at 47.5%. It sat 6.5% below its high of Aug 19, 2026 on Sep 11, 2026.
Questions people ask
- Which returned more over the last year, DIA or IBB?
- In the year to Sep 13, 2026, with distributions reinvested, DIA returned +15.6% and IBB returned +41.5%, so IBB returned more. One year is one year; the longer windows are in the table.
- How much do DIA and IBB overlap with the S&P 500?
- By their latest filed holdings, 97% of DIA and 36% of IBB by weight is stocks the S&P 500 already holds. Between the two funds, 0% of their books are the same securities at the same weight.
Other comparisons
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Where these figures came from
ETFIQ links to the documents behind every figure. It is not affiliated with any issuer, and a link is not an endorsement.
Cite this page. ETFIQ, DIA against IBB, data as of Sep 13, 2026. https://etfiq.com/compare/any/dia-vs-ibb Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources