Data as of Sep 12, 2026. Both funds on the fields they both publish, from the same sources.
XBI vs XLK: how they differ
XBI and XLK hold 0% of their weight in the same names, and XBI returned more over the year.
State Street(R) SPDR(R) S&P(R) Biotech ETF and State Street(R) Technology Select Sector SPDR(R) ETF.
What they hold in common
By the books each fund has filed, XBI and XLK hold 0% of their money in the same securities at the same weight.
| Only in XBI | Only in XLK |
|---|---|
| Apogee Therapeutics Inc 1.49% | NVIDIA Corp 14.66% |
| Moderna Inc 1.41% | Apple Inc 12.86% |
| Twist Bioscience Corp 1.41% | Microsoft Corp 8.38% |
| Oruka Therapeutics Inc 1.38% | Micron Technology Inc 5.42% |
| Kymera Therapeutics Inc 1.36% | Broadcom Inc 5.41% |
| Viking Therapeutics Inc 1.31% | Advanced Micro Devices Inc 5.28% |
| Praxis Precision Medicines Inc 1.29% | Intel Corp 3.68% |
| Erasca Inc 1.27% | 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.
| XBI State Street(R) SPDR(R) S&P(R) Biotech ETF | XLK State Street(R) Technology Select Sector SPDR(R) ETF | |
|---|---|---|
| Where it sits | Core index fund | Core index fund |
| Issuer | State Street | State Street |
| What it is | SPDR S&P Biotech | Technology |
| Total return, 1 year | +64.0% | +39.2% |
| S&P 500 over the same days | +17.5% | +17.5% |
| Gap to the S&P 500 | +46.5 pts | +21.7 pts |
| Expense ratio | 0.35% | 0.08% |
| Already in the S&P 500 | 8.5% | 100.0% |
| Holdings | 150 | 74 |
XBI in plain words
XBI is an index equity fund tracking the SPDR S&P Biotech. Over the year to Sep 11, 2026 it returned +64.0% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.35% a year. By its holdings filed for Jun 30, 2026, 8% of the fund by weight is stocks the S&P 500 also holds, across 150 positions, with the top ten at 13.3%. It sat 9.6% below its high of Feb 8, 2021 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, XBI or XLK?
- In the year to Sep 12, 2026, with distributions reinvested, XBI returned +64.0% and XLK returned +39.2%, so XBI returned more. One year is one year; the longer windows are in the table.
- Which is cheaper, XBI or XLK?
- XBI charges 0.35% a year and XLK charges 0.08%, so XLK is cheaper. Fees come from each fund's prospectus.
- How much do XBI and XLK overlap with the S&P 500?
- By their latest filed holdings, 8% of XBI 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, XBI against XLK, data as of Sep 12, 2026. https://etfiq.com/compare/any/XBI-XLK Free to use with attribution; the underlying files are at Open data.
A comparison is not a recommendation. Standards and sources