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Correlation Analysis

Apple Inc. vs Corning Incorporated

AAPL vs GLW

+0.704

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

GLW logo

Corning Incorporated

GLW

Corning is a provider of glass, ceramics, and optical fiber across six distinct end markets. Corning's largest segments by revenue are display glass for TVs and optical fiber for telecom networks and data centers. It also provides cover glass for smartphones as well as filters and substrates and glass for cars, produces pharmaceutical glass, and produces polysilicon for solar panels. Corning is a US producer and is vertically integrated across its products and markets.

Market cap 125.8B · 67,200 employees

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

Who Moves First

AAPL leads GLW by 6 days

AAPL tends to move before GLW.

Best correlation after shifting: +0.705 (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

+0.215

10 periods · Return correlation when both series rose

Both Falling

+0.830

8 periods · Return correlation when both series fell

Diverging

-0.384

17 periods · Return correlation when series moved apart

R-Squared

49.6%

Share of variance in one series explained by the other.

Trend Agreement

64.5%

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: [0.675, 0.731]

Time Series

Rebased to 100

Green: AAPLGray: GLW36 of 1,254 points (sampled)

Scatter

XY Regression

112.3120140160180200220240260280285.616.920406080100120140158.3Apple Inc.Corning IncorporatedData pointsFit (r = 0.704)

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

GLW logo

Corning Incorporated

GLW

Market cap 125.8B · 67,200 employees

Stock · 1,254 raw → 1,254 prepared

Sign agreement

100.0%

How often both values share the same sign.

Zero crossings

28

Estimated crossover points between normalized spreads.

Slope

0.3945

Linear regression slope.

Intercept

-28.3424

Linear regression intercept.

Related Extremes

Highest and Lowest Correlated

Saved 3 hours ago · ID: stock-aapl-vs-stock-glw-daily-20260408-u30bdn