PTC vs XLK: Correlation
How closely do PTC Inc. (PTC) and Technology Select Sector SPDR Fund (XLK) trade together? Their weekly returns over three years give a correlation of 0.43, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are PTC and XLK?
Across a 3-year window, the weekly returns of PTC and XLK correlate at 0.43, moderate. The past 12 months show a weaker link (0.23) than the 3-year average (0.43). Stretching to 5 years gives 0.48, with an annualized covariance of 296.6 %².
Among the 32 assets we track against PTC, XLK ranks #20 by 3-year correlation. The last year tells two different stories: XLK led by 70.0 percentage points, -26.6% for PTC against +43.4% for XLK. The relationship is regime-dependent: the rolling one-year correlation swung between 0.21 and 0.71 over the past three years, so this pair behaves very differently depending on the market environment.
How is this computed?
Pearson correlation on weekly returns: ρ(A,B) = cov(rA, rB) / (σA · σB), over windows of 52, 156 and 260 weeks. Covariance is annualized (×52) and expressed in %². Full definitions on the methodology page.
PTC vs XLK: side by side
| PTC (PTC Inc.) | XLK (Technology Select Sector SPDR Fund) | |
|---|---|---|
| 1-year return | -26.6% | +43.4% |
| 5-year return | +20.0% | +145.2% |
| Volatility (ann.) | 28.8% | 24.0% |
| Beta vs S&P 500 | 1.02 | 1.50 |
| Max drawdown (3Y) | -48.1% | -25.7% |
| Market cap | $17.2B | – |
| P/E (trailing) | 14.7 | – |
| Dividend yield | 0.00% | 0.45% |
| Expense ratio | – | 0.08% |
| Assets under management | – | $115.4B |
| Sector / category | Information Technology | Sector ETF |
On the fund side, XLK sits in the Technology category at State Street Investment Management, with $115.4B under management, 73 holdings, a 0.08% expense ratio, a 0.45% trailing dividend yield.
Year-by-year returns
| Year | PTC | XLK |
|---|---|---|
| 2022 | -0.9% | -27.7% |
| 2023 | +45.8% | +56.0% |
| 2024 | +5.1% | +21.6% |
| 2025 | -5.3% | +24.6% |
| 2026 | -8.8% | +31.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Fund exposure
A structural note: 0.12% of XLK is PTC itself, so the fund partly moves with the stock by construction.
Are PTC and XLK good diversifiers for each other?
Reasonably. At 0.43, PTC and XLK keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between PTC and XLK?
Using weekly returns as of 2026-08-27: 0.43 over 3 years, with 0.23 over the last year and 0.48 over 5 years.
Is XLK a good diversifier for PTC?
Reasonably. At 0.43, PTC and XLK keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.43 mean?
On the −1 to +1 scale, 0.43 describes how much the two returns move together: +1 is lockstep, 0 is independence, negative values mean opposite directions. It says nothing about which performed better.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/ptc-vs-xlk.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/ptc-vs-xlk/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: PTC correlations · XLK correlations
