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Correlation Analysis

Apple Inc. vs AT&T Inc.

AAPL vs T

+0.221

Light 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

T logo

AT&T Inc.

T

The wireless business contributes nearly 70% of AT&T's revenue. The company is the third-largest US wireless carrier, connecting 74 million postpaid and 17 million prepaid phone customers. Fixed-line enterprise services, which account for about 14% of revenue, include internet access, private networking, security, voice, and wholesale network capacity. Residential services, about 11% of revenue, primarily consist of in-home broadband internet access, serving 15 million customers. AT&T also has a sizable presence in Mexico, with 25 million wireless customers, but this business only accounts for 3% of revenue. The company recently sold its 70% equity stake in satellite television provider DirecTV to its partner, private equity firm TPG.

Market cap 197.7B · 133,030 employees

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

Time Series

Relative Performance

Green: AAPLGray: T36 of 1,254 points (sampled)

Who Moves First

AAPL leads T by 6 days

AAPL tends to move before T.

After testing 13 timing shifts, the strongest relationship was +0.229 (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

+0.621

8 periods · Return correlation when both series rose

Both Falling

+0.273

7 periods · Return correlation when both series fell

Diverging

-0.585

20 periods · Return correlation when series moved apart

R-Squared

4.9%

Share of variance in one series explained by the other.

Trend Agreement

56.1%

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: [0.167, 0.273]

Scatter

XY Regression

112.3120140160180200220240260280285.613.281520253031.28Apple Inc.AT&T Inc.Data pointsFit (r = 0.221)

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

T logo

AT&T Inc.

T

Market cap 197.7B · 133,030 employees

Stock · 1,254 raw → 1,254 prepared

Sign agreement

100.0%

How often both values share the same sign.

Zero crossings

23

Estimated crossover points between normalized spreads.

Slope

0.0260

Linear regression slope.

Intercept

17.1125

Linear regression intercept.

Related Extremes

Highest and Lowest Correlated

Saved 5 hours ago · ID: stock-aapl-vs-stock-t-daily-20260408-c3sh1a