Correlation Analysis
Walmart Inc. Common Stock vs West Pharmaceutical Services, Inc.
WMT vs WST
-0.580
Moderate inverse
When one moves up, the other tends to move down.
Walmart Inc. Common Stock
↗WMT
Since its founding in 1962, Walmart has become the world's largest retailer, operating over 10,700 stores globally (including 4,600 namesake locations on its home turf and another 600 Sam's Club outlets) and growing its e-commerce presence, attracting 270 million customers weekly. In aggregate, the firm posted more than $680 billion in fiscal 2025 sales. Its core operations span three reporting segments: Walmart US (68% of fiscal 2025 sales), Walmart International (18%), and Sam's Club (14%). Within the US, nearly 60% of its $465 billion in fiscal 2025 revenue came from its grocery offerings, with another quarter from general merchandise. Internationally, Walmart's operations are concentrated in Mexico, though it also has budding exposure to India.
Market cap 1T
West Pharmaceutical Services, Inc.
↗WST
West Pharmaceutical Services is based in Pennsylvania and is a key supplier to firms in the pharmaceutical, biotechnology, and generic drug industries. West sells elastomer-based packaging components (including stoppers, seals, and plungers), nonglass containment solutions, and auto-injectors for injectable drugs, which include large-molecule biologics, peptides such as GLP-1 receptor agonists, and small-molecule drugs. The company reports in two segments: proprietary products (about 80% of total revenue) and contract-manufactured products (about 20% of total revenue). It generates approximately 55% of its revenue from international markets and 45% from the United States.
Market cap 18.5B · 10,800 employees
Time Series
Relative Performance
Who Moves First
WMT leads WST by 6 days
WMT tends to move before WST.
After testing 13 timing shifts, the strongest relationship was -0.589 (they moved in opposite directions).
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
-0.407
15 periods · Return correlation when both series rose
Both Falling
+0.608
5 periods · Return correlation when both series fell
Diverging
-0.449
15 periods · Return correlation when series moved apart
R-Squared
33.7%
Share of variance in one series explained by the other.
Trend Agreement
57.2%
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: [-0.616, -0.542]
Scatter
XY Regression
Pipeline
Data quality details
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
Walmart Inc. Common Stock
WMT
Market cap 1T
Stock · 1,254 raw → 1,254 prepared
Series B
West Pharmaceutical Services, Inc.
WST
Market cap 18.5B · 10,800 employees
Stock · 1,254 raw → 1,254 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
30
Estimated crossover points between normalized spreads.
Slope
-1.5316
Linear regression slope.
Intercept
423.7774
Linear regression intercept.
Related Extremes
Highest and Lowest Correlated
WMT
Walmart Inc. Common Stock
Highest
+0.939
Woodward, Inc.
WWD · 1,254 data points
Lowest
-0.767
Weyerhaeuser Company
WY · 1,254 data points
WST
West Pharmaceutical Services, Inc.
Highest
-0.168
Tesla, Inc. Common Stock
TSLA · 1,254 data points
Lowest
-0.569
Exxon Mobil Corporation
XOM · 1,254 data points
Saved 4 hours ago · ID: stock-wmt-vs-stock-wst-daily