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Correlation Analysis

ATI Inc. vs Costco Wholesale Corp

ATI vs COST

+0.796

Strong positive

When one moves up, the other tends to follow.

ATI logo

ATI Inc.

ATI

ATI Inc supplies specialty metals to various end markets, including aerospace and defense, oil and gas, automotive, and electrical energy, among many others. The company's operating segment includes High-Performance Materials and Components and Advanced Alloys and Solutions. The majority of revenue is from the High-Performance Materials segment. The High-Performance Materials segment is focused on a wide range of high-performance specialty materials, parts, and components for several the majority of end markets, including the aerospace & defense, medical, and energy markets. Geographically, it operates in the United States, China, the United Kingdom, Germany, France, Canada, and Others, the majority is from the United States.

Market cap 20.2B · 7,600 employees

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

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

Time Series

Relative Performance

Green: ATIGray: COST36 of 1,254 points (sampled)

Who Moves First

ATI leads COST by 5 days

ATI tends to move before COST.

After testing 13 timing shifts, the strongest relationship was +0.797 (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

+0.482

12 periods · Return correlation when both series rose

Both Falling

+0.600

6 periods · Return correlation when both series fell

Diverging

-0.652

17 periods · Return correlation when series moved apart

R-Squared

63.4%

Share of variance in one series explained by the other.

Trend Agreement

57.5%

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: [0.775, 0.816]

Scatter

XY Regression

4.920406080100120140157.83064006008001,0001,134ATI Inc.Costco Wholesale CorpData pointsFit (r = 0.796)

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

ATI logo

ATI Inc.

ATI

Market cap 20.2B · 7,600 employees

Stock · 1,254 raw → 1,254 prepared

Series B

COST logo

Costco Wholesale Corp

COST

Market cap 451.9B

Stock · 1,254 raw → 1,254 prepared

Sign agreement

100.0%

How often both values share the same sign.

Zero crossings

3

Estimated crossover points between normalized spreads.

Slope

5.5953

Linear regression slope.

Intercept

402.9199

Linear regression intercept.

Related Extremes

Highest and Lowest Correlated

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