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Correlation Analysis

Apple Inc. vs Cummins Inc.

AAPL vs CMI

+0.844

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

CMI logo

Cummins Inc.

CMI

Cummins is a leading manufacturer of diesel and other engines used in heavy- and medium-duty commercial trucks, off-highway equipment, and locomotives, in addition to prime power and standby generators. The company also sells powertrain components, which include filtration products, transmissions, turbochargers, aftertreatment systems, and fuel systems. Sales are approximately 60% US and Canada and 40% rest of the world. Much of Cummins' foreign sales (China, India, and so forth) are through joint ventures. The company operates 650 distributors and over 19,000 dealer locations across 190 countries. Cummins' business model is unique as it competes with many of its heavy-duty truck manufacturer customers, which also make their own engines.

Market cap 76.3B · 67,400 employees

Apr 9, 2021 — Apr 7, 2026Daily1,254 observationsStockStockTechnology

Who Moves First

AAPL leads CMI by 6 days

AAPL tends to move before CMI.

Best correlation after shifting: +0.844 (13 shifts scanned)

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

-0.151

13 periods · Return correlation when both series rose

Both Falling

+0.894

6 periods · Return correlation when both series fell

Diverging

-0.695

16 periods · Return correlation when series moved apart

R-Squared

71.2%

Share of variance in one series explained by the other.

Trend Agreement

59.7%

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: [0.827, 0.859]

Time Series

Rebased to 100

Green: AAPLGray: CMI36 of 1,254 points (sampled)

Scatter

XY Regression

112.3120140160180200220240260280285.6167200300400500600620Apple Inc.Cummins Inc.Data pointsFit (r = 0.844)

Pipeline

Data quality details

Pipeline Summary

1,254 paired observations 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

CMI logo

Cummins Inc.

CMI

Market cap 76.3B · 67,400 employees

Stock · 1,254 raw → 1,254 prepared

Sign agreement

100.0%

How often both values share the same sign.

Zero crossings

34

Estimated crossover points between normalized spreads.

Slope

1.9459

Linear regression slope.

Intercept

-76.1603

Linear regression intercept.

Related Extremes

Highest and Lowest Correlated

Saved 3 hours ago · ID: stock-aapl-vs-stock-cmi-daily-20260408-quvwsl