Data as of Sep 12, 2026. Both funds on the fields they both publish, from the same sources.
IBB vs XLK: how they differ
IBB and XLK hold 0% of their weight in the same names, and IBB returned more over the year.
iShares Biotechnology ETF and State Street(R) Technology Select Sector SPDR(R) ETF.
What they hold in common
By the books each fund has filed, IBB and XLK hold 0% of their money in the same securities at the same weight.
| Only in IBB | Only in XLK |
|---|---|
| Vertex Pharmaceuticals, Inc. 8.09% | NVIDIA Corp 14.66% |
| Amgen, Inc. 7.84% | Apple Inc 12.86% |
| Gilead Sciences, Inc. 6.85% | Microsoft Corp 8.38% |
| Regeneron Pharmaceuticals, Inc. 4.91% | Micron Technology Inc 5.42% |
| Argenx SE 3.76% | Broadcom Inc 5.41% |
| Alnylam Pharmaceuticals, Inc. 3.12% | Advanced Micro Devices Inc 5.28% |
| Natera, Inc. 2.89% | Intel Corp 3.68% |
| Revolution Medicines, Inc. 2.78% | Applied Materials Inc 3.20% |
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 Jun 30, 2026.
| IBB iShares Biotechnology ETF | XLK State Street(R) Technology Select Sector SPDR(R) ETF | |
|---|---|---|
| Where it sits | Core index fund | Core index fund |
| Issuer | iShares | State Street |
| What it is | Biotechnology | Technology |
| Total return, 1 year | +41.5% | +39.2% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | +24.0 pts | +21.7 pts |
| Expense ratio | 0.44% | 0.08% |
| Already in the S&P 500 | 35.6% | 100.0% |
| Holdings | 248 | 74 |
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 Jun 30, 2026, 36% of the fund by weight is stocks the S&P 500 also holds, across 248 positions, with the top ten at 44.8%. It sat 6.5% below its high of Aug 19, 2026 on Sep 11, 2026.
XLK in plain words
XLK is an index equity fund tracking the Technology. Over the year to Sep 11, 2026 it returned +39.2% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.08% a year. By its holdings filed for Jun 30, 2026, 100% of the fund by weight is stocks the S&P 500 also holds, across 74 positions, with the top ten at 64.5%. It sat 5.2% below its high of Jun 2, 2026 on Sep 11, 2026.
Questions people ask
- Which returned more over the last year, IBB or XLK?
- In the year to Sep 12, 2026, with distributions reinvested, IBB returned +41.5% and XLK returned +39.2%, so IBB returned more. One year is one year; the longer windows are in the table.
- Which is cheaper, IBB or XLK?
- IBB charges 0.44% a year and XLK charges 0.08%, so XLK is cheaper. Fees come from each fund's prospectus.
- How much do IBB and XLK overlap with the S&P 500?
- By their latest filed holdings, 36% of IBB and 100% of XLK 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.
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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, IBB against XLK, data as of Sep 12, 2026. https://etfiq.com/compare/any/IBB-XLK Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources