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Correlation Analysis

Apple Inc. vs Stryker Corporation

AAPL vs SYK

+0.825

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

SYK logo

Stryker Corporation

SYK

Stryker designs, manufactures, and markets an array of medical equipment, instruments, consumable supplies, and implantable devices. The product portfolio includes hip and knee replacements, extremities, endoscopy systems, operating room equipment, embolic coils, hospital beds and gurneys, and orthopedic robotics. Stryker remains one of the three largest competitors in reconstructive orthopedic implants and holds the leadership position in operating room equipment. Roughly one-fourth of Stryker's total revenue currently comes from outside the United States.

Market cap 127.3B · 56,000 employees

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

Time Series

Rebased to 100

Green: AAPLGray: SYK36 of 1,254 points (sampled)

Who Moves First

SYK leads AAPL by 6 days

SYK tends to move before AAPL.

Best correlation after shifting: +0.826 (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

-0.103

10 periods · Return correlation when both series rose

Both Falling

+0.690

7 periods · Return correlation when both series fell

Diverging

-0.569

18 periods · Return correlation when series moved apart

R-Squared

68.1%

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: [0.807, 0.842]

Scatter

XY Regression

112.3120140160180200220240260280285.6182.8200250300350400403.6Apple Inc.Stryker CorporationData pointsFit (r = 0.825)

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

SYK logo

Stryker Corporation

SYK

Market cap 127.3B · 56,000 employees

Stock · 1,254 raw → 1,254 prepared

Sign agreement

100.0%

How often both values share the same sign.

Zero crossings

53

Estimated crossover points between normalized spreads.

Slope

1.1549

Linear regression slope.

Intercept

87.2267

Linear regression intercept.

Related Extremes

Highest and Lowest Correlated

Saved 3 hours ago · ID: stock-aapl-vs-stock-syk-daily-20260408-04fy7j