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Correlation Analysis

Apple Inc. vs The Cigna Group

AAPL vs CI

+0.337

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

C

The Cigna Group

CI

Cigna primarily provides pharmacy benefit management and health insurance services. Its PBM and specialty pharmacy services, which were greatly expanded by its 2018 merger with Express Scripts, are mostly sold to health insurance plans and employers. Its largest PBM contract is with the Department of Defense, and it recently won a multiyear deal with top-tier insurer Centene. In health insurance and other benefits, Cigna primarily serves employers through self-funding arrangements, and the company operates mostly in the US with 16 million US and 2 million international medical members covered as of December 2025.

Market cap 72.7B · 67,700 employees

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

Who Moves First

CI leads AAPL by 6 days

CI tends to move before AAPL.

Best correlation after shifting: +0.338 (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

-0.418

7 periods · Return correlation when both series rose

Both Falling

N/A

2 periods · Return correlation when both series fell

Diverging

-0.775

26 periods · Return correlation when series moved apart

R-Squared

11.4%

Share of variance in one series explained by the other.

Trend Agreement

53.8%

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: [0.287, 0.385]

Time Series

Rebased to 100

Green: AAPLGray: CI36 of 1,254 points (sampled)

Scatter

XY Regression

112.3120140160180200220240260280285.6192.1200250300350375.1Apple Inc.The Cigna GroupData pointsFit (r = 0.337)

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

C

The Cigna Group

CI

Market cap 72.7B · 67,700 employees

Stock · 1,254 raw → 1,254 prepared

Sign agreement

100.0%

How often both values share the same sign.

Zero crossings

43

Estimated crossover points between normalized spreads.

Slope

0.3292

Linear regression slope.

Intercept

223.6502

Linear regression intercept.

Related Extremes

Highest and Lowest Correlated

Saved 3 hours ago · ID: stock-aapl-vs-stock-ci-daily-20260408-e4tg1z