IYW vs XLK: Which ETF Is Better in 2026?
A metric-by-metric comparison of iShares U.S. Technology ETF (IYW) and State Street Technology Select Sector SPDR ETF (XLK) — both Technology funds — using ETFValuer's daily-updated rankings.
Educational content — not financial advice. Data as of July 26, 2026. ~5 minute read.
The Verdict
IYW and XLK are close to the same fund wearing different labels. Both sit in the Technology category and their daily returns move almost identically, so this is not really a question of which fund is better — it is a question of which one is cheaper to own and easier to trade in your account. Everything below is about finding the small, structural edges, because the investment exposure is a wash.
On ETFValuer's overall model — which blends return, risk-adjusted performance, cost, drawdown, size and volatility — XLK scores higher: 76.7 (Grade B+) versus 71.4 for IYW. That doesn't make IYW a bad fund; it means XLK currently edges it out on this specific mix of factors. Read the metric-by-metric breakdown below before deciding which matters more for your own portfolio.
Head-to-Head: Every Metric
| IYW | XLK | |
|---|---|---|
| Category | Technology | Technology |
| Expense ratio | 0.38% | 0.08% |
| Fund size (AUM) | $25.4B | $123.9B |
| Dividend yield | 0.01% | 0.62% |
| 1-year return | +34.61% | +35.85% |
| 3-year return | +112.43% | +101.18% |
| Volatility | 23.27% | 24.77% |
| Max drawdown | -26.47% | -25.66% |
| Sharpe ratio | 1.27 | 1.25 |
| ETFValuer score | 71.4 | 76.7 |
| Grade | B | B+ |
| Overall rank | #96 | #35 |
Bold marks the better value in each row. "Better" is directional only (e.g. lower cost, higher return) — it isn't a recommendation by itself. See the full methodology.
Cost
XLK is the cheaper fund, charging 0.08% a year versus 0.38% for IYW — a gap of 0.30 percentage points (about $30.00/year on a $10,000 position) that compounds meaningfully over a multi-decade holding period. Since these two deliver almost the same exposure, that fee gap is close to the entire difference between them — it comes straight out of your return with nothing offered in exchange. See the ETF Fee Calculator for the exact dollar impact at your investment size and horizon.
What IYW's Fees Cost You
IYW charges an expense ratio of 0.38% a year, deducted automatically from the fund's value. Small percentages compound into real money — adjust the figures below to see the impact on your own numbers.
Assumes a constant gross return and no additional contributions — a simplification, but it isolates exactly what the expense ratio costs. Try the full fee calculator to model contributions and compare any two funds.
Performance & Risk
Over the trailing 3 years, IYW returned +112.43% versus +101.18% for XLK — a gap of about 11.2 percentage points. On risk, XLK has held up better historically, with a shallower max drawdown (-25.66% vs. -26.47%). IYW currently has the better risk-adjusted return (Sharpe ratio of 1.27 vs. 1.25), meaning it delivered more return per unit of volatility taken on.
How Closely Do They Track Each Other?
Over the last 3.0 years of daily returns (752 shared trading days), IYW and XLK show a extremely high correlation of 0.986 — very close substitutes. Holding both would add very little diversification: when one falls, the other almost always falls with it. Treat these as alternatives to each other, not as complements in the same portfolio.
| Measure | Value | What it means |
|---|---|---|
| Daily return correlation | 0.986 | Extremely high — very close substitutes |
| R-squared | 97.3% | 97.3% of IYW's daily moves are explained by XLK's |
| Tracking error (annualised) | 4.09% | Typical yearly spread between the two funds' returns |
| Annualised return over 3.0y | IYW +28.95% · XLK +26.41% | IYW ahead by 2.54 points a year |
Correlation alone understates how far these can drift. Across every rolling 12-month window in the period, IYW finished as much as +11.1 points ahead of XLK at the best extreme and -7.9 points at the worst — a 19.0-point spread between the best and worst year of relative performance. Two funds can correlate tightly day to day and still deliver very different outcomes over any single year you happen to hold them.
Calculated from daily total returns over the trailing 3-year window, recomputed every day this site refreshes. Correlation of 1.00 means the two funds moved in lockstep; 0.00 means their daily moves were unrelated.
Holdings Overlap
IYW and XLK hold 6 of the same companies among their top 10 positions. Those shared names make up 44.1% of IYW and 50.9% of XLK. That's meaningful duplication. The funds aren't interchangeable, but a good share of your money would be riding on the same companies twice.
| Shared Holding | IYW Weight | XLK Weight |
|---|---|---|
| NVIDIA CORPORATION | 16.23% | 15.50% |
| APPLE INC. | 13.63% | 13.63% |
| MICROSOFT CORPORATION | 3.99% | 10.05% |
| BROADCOM INC. | 3.78% | 5.37% |
| ADVANCED MICRO DEVICES, INC. | 3.50% | 2.95% |
| MICRON TECHNOLOGY, INC. | 2.98% | 3.39% |
Compares the top 10 reported holdings from each fund's most recent SEC N-PORT-P filing, so it understates total overlap — funds tracking similar indexes overlap far more deeply than the top 10 alone can show. Search any company across all tracked funds with the Stock Overlap tool.
Which One Should You Pick?
Lean IYW if…
- You weight recent results heavily — it returned 112.4% over 3 years against 101.2%
Lean XLK if…
- You want the lower running cost — 0.08% vs 0.38%, about $30 a year less on a $10,000 position
- Current income matters to you — it yields 0.62% against 0.01%
- You want the deeper, more liquid market ($124B in assets vs $25B)
Whichever you pick, holding both at full weight is usually the wrong answer — see the overlap and correlation sections above.
Frequently Asked Questions
Is IYW or XLK better?
On ETFValuer's overall model — which blends return, risk-adjusted performance, cost, drawdown, size and volatility — XLK scores higher: 76.7 (Grade B+) versus 71.4 for IYW. That doesn't make IYW a bad fund; it means XLK currently edges it out on this specific mix of factors. Read the metric-by-metric breakdown below before deciding which matters more for your own portfolio.
Which has the lower expense ratio, IYW or XLK?
XLK currently has the lower expense ratio (0.08% vs. 0.38%).
Can I hold both IYW and XLK?
You can, but there's little point. IYW and XLK have a daily return correlation of 0.99 over the past 3.0 years, meaning they move almost in lockstep. Holding both roughly doubles a single bet rather than spreading it — pick whichever wins on cost and liquidity and put the money in one place.
Go deeper on either fund
Full daily-updated metrics, holdings context, and category peers.