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Correlation Analysis

Costco Wholesale Corp vs Medline Inc. Class A common stock

COST vs MDLN

+0.502

Moderate positive

When one moves up, the other tends to follow.

COST logo

Costco Wholesale Corp

COST

Founded in 1983, Costco Wholesale now operates a global chain of membership-based warehouse clubs, delivering high-quality goods and services at consistently low prices. As of its most recent fiscal year, Costco operated approximately 910 warehouses, serving more than 80 million members across its three geographic segments: Costco US (approximately 73% of total revenue), Costco Canada (13%), and Costco International (14%).Costco's core value proposition—quality products at unbeatable prices—has yielded consistently strong member renewal rates (93% in the US and Canada and nearly 90% internationally). About 55% of Costco's fiscal 2025 revenue came from its grocery offerings, and another 25% from general merchandise.

Market cap 451.9B

M

Medline Inc. Class A common stock

MDLN

Medline is the largest medical-surgical products and supply chain solutions provider in the US. The company generates over 90% of its revenue domestically and serves some of the largest US health systems. Medline offers approximately 190,000 Medline-branded products across more than 250 product families—including front line care, surgical solutions, and laboratory and diagnostics—as well as roughly 150,000 third-party products sourced from over 1,250 vendors. The company maintains prime vendor relationships with many customers, acting as the primary consolidated logistics partner for their medical-surgical needs. Medline has significant scale, supported by more than 30 manufacturing facilities and a fleet of over 2,000 owned delivery trucks. Medline went public in December 2025.

Market cap 35.6B · 45,000 employees

Dec 17, 2025 — Apr 7, 2026Daily75 data pointsStockStockConsumer

Time Series

Relative Performance

Green: COSTGray: MDLN36 of 75 points (sampled)

Who Moves First

in sync

COST and MDLN tend to move at the same time.

After testing 13 timing shifts, the strongest relationship was +0.502 (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

-0.365

10 periods · Return correlation when both series rose

Both Falling

+0.303

5 periods · Return correlation when both series fell

Diverging

-0.528

20 periods · Return correlation when series moved apart

R-Squared

25.2%

Share of variance in one series explained by the other.

Trend Agreement

47.3%

How often both series moved in the same direction period-to-period.

Overlap Quality

75

Thin shared window — 75 usable pairs.

Significance

p < 0.001

95% CI: [0.311, 0.655]

Scatter

XY Regression

8428509009501,0001,027.838.1540424446485050.49Costco Wholesale CorpMedline Inc. Class A common stockData pointsFit (r = 0.502)

Pipeline

Data quality details

Pipeline Summary

75 paired data points survived the daily window.

Raw input

1,254

75

Normalized

1,254

75

Prepared

1,254

75

Aligned

75

75

Invalid removed

0

A: 0 / B: 0

Duplicates removed

0

A: 0 / B: 0

Alignment drops

1,179

A: 1179 / B: 0

Series A

COST logo

Costco Wholesale Corp

COST

Market cap 451.9B

Stock · 1,254 raw → 1,254 prepared

Series B

M

Medline Inc. Class A common stock

MDLN

Market cap 35.6B · 45,000 employees

Stock · 75 raw → 75 prepared

Sign agreement

100.0%

How often both values share the same sign.

Zero crossings

3

Estimated crossover points between normalized spreads.

Slope

0.0241

Linear regression slope.

Intercept

20.7495

Linear regression intercept.

Related Extremes

Highest and Lowest Correlated

Saved 7 hours ago · ID: stock-cost-vs-stock-mdln-daily