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Correlation Analysis

Apple Inc. vs Paccar Inc

AAPL vs PCAR

+0.813

Strong positive

When one moves up, the other tends to follow.

AAPL logo

Apple Inc.

AAPL

Apple is among the largest companies in the world, with a broad portfolio of hardware and software products targeted at consumers and businesses. Apple's iPhone makes up a majority of the firm sales, and Apple's other products like Mac, iPad, and Watch are designed around the iPhone as the focal point of an expansive software ecosystem. Apple has progressively worked to add new applications, like streaming video, subscription bundles, and augmented reality. The firm designs its own software and semiconductors while working with subcontractors like Foxconn and TSMC to build its products and chips. Slightly less than half of Apple's sales come directly through its flagship stores, with a majority of sales coming indirectly through partnerships and distribution.

Market cap 3.8T

PCAR logo

Paccar Inc

PCAR

Paccar is a leading manufacturer of medium- and heavy-duty trucks under the premium nameplates Kenworth and Peterbilt, which are primarily sold in the Americas and Australia, and DAF, which primarily services Europe and South America. The trucks segment (74% sales) goes to market through a network of 2,200 independent dealers. Paccar maintains an internal finance subsidiary that provides retail and wholesale financing for customers and dealers (6% sales). In recent years, Paccar has aggressively expanded its parts business (20% of sales), including engines, axles, and transmissions for its own truck brands as well as independent producers. The company commands 30% of the Class 8 market share in North America and 15% of the heavy-duty market share in Europe.

Market cap 62.2B · 25,900 employees

Apr 9, 2021 — Apr 7, 2026Daily1,254 data pointsStockStockTechnology

Time Series

Relative Performance

Green: AAPLGray: PCAR36 of 1,254 points (sampled)

Who Moves First

in sync

AAPL and PCAR tend to move at the same time.

After testing 13 timing shifts, the strongest relationship was +0.813 (they moved in the same direction).

Do They Crash Together?

Correlation by Market Regime

How these series behave when markets are rising, falling, or diverging. A correlation that holds in drawdowns is very different from one that only works in rallies.

Both Rising

-0.221

13 periods · Return correlation when both series rose

Both Falling

+0.480

7 periods · Return correlation when both series fell

Diverging

-0.674

15 periods · Return correlation when series moved apart

R-Squared

66.1%

Share of variance in one series explained by the other.

Trend Agreement

59.9%

How often both series moved in the same direction period-to-period.

Overlap Quality

1,254

Deep shared window — 1,254 usable pairs.

Significance

p < 0.001

95% CI: [0.794, 0.831]

Scatter

XY Regression

112.3120140160180200220240260280285.650.16080100120130.4Apple Inc.Paccar IncData pointsFit (r = 0.813)

Pipeline

Data quality details

Pipeline Summary

1,254 paired data points survived the daily window.

Raw input

1,254

1,254

Normalized

1,254

1,254

Prepared

1,254

1,254

Aligned

1,254

1,254

Invalid removed

0

A: 0 / B: 0

Duplicates removed

0

A: 0 / B: 0

Alignment drops

0

A: 0 / B: 0

Series A

AAPL logo

Apple Inc.

AAPL

Market cap 3.8T

Stock · 1,254 raw → 1,254 prepared

Series B

PCAR logo

Paccar Inc

PCAR

Market cap 62.2B · 25,900 employees

Stock · 1,254 raw → 1,254 prepared

Sign agreement

100.0%

How often both values share the same sign.

Zero crossings

39

Estimated crossover points between normalized spreads.

Slope

0.4350

Linear regression slope.

Intercept

2.1669

Linear regression intercept.

Related Extremes

Highest and Lowest Correlated

Saved 5 hours ago · ID: stock-aapl-vs-stock-pcar-daily-20260408-dqjzhf