Correlation Analysis
Costco Wholesale Corp vs Warner Bros. Discovery, Inc. Series A Common Stock
COST vs WBD
+0.109
Weak positive
When one moves up, the other tends to follow.
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
Warner Bros. Discovery, Inc. Series A Common Stock
↗WBD
Warner Bros. Discovery operates in three segments: streaming, studios, and linear networks. The streaming business includes HBO Max, which is rapidly increasing its international footprint in addition to its major presence in the US. Studios include industry leaders in both film and television, which produce movies and television series that are monetized in multiple ways, including theatrical release, sales to third parties, and feeding into Warner's own platforms. Global networks consist of basic cable networks like CNN, TNT, TBS, Discovery, HGTV, and The Food Network. The Discovery+ streaming service will remain part of global networks.
Market cap 68.7B · 35,500 employees
Time Series
Relative Performance
Who Moves First
COST leads WBD by 6 days
COST tends to move before WBD.
After testing 13 timing shifts, the strongest relationship was +0.126 (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
-0.296
9 periods · Return correlation when both series rose
Both Falling
+0.917
5 periods · Return correlation when both series fell
Diverging
-0.432
21 periods · Return correlation when series moved apart
R-Squared
1.2%
Share of variance in one series explained by the other.
Trend Agreement
55.1%
How often both series moved in the same direction period-to-period.
Overlap Quality
1,000
Deep shared window — 1,000 usable pairs.
Significance
p < 0.001
95% CI: [0.048, 0.170]
Scatter
XY Regression
Pipeline
Data quality details
Pipeline
Data quality details
Pipeline Summary
1,000 paired data points survived the daily window.
Raw input
1,254
1,000
Normalized
1,254
1,000
Prepared
1,254
1,000
Aligned
1,000
1,000
Invalid removed
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
254
A: 254 / B: 0
Series A
Costco Wholesale Corp
COST
Market cap 451.9B
Stock · 1,254 raw → 1,254 prepared
Series B
Warner Bros. Discovery, Inc. Series A Common Stock
WBD
Market cap 68.7B · 35,500 employees
Stock · 1,000 raw → 1,000 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
11
Estimated crossover points between normalized spreads.
Slope
0.0030
Linear regression slope.
Intercept
11.0740
Linear regression intercept.
Related Extremes
Highest and Lowest Correlated
COST
Costco Wholesale Corp
Highest
+0.977
Republic Services Inc.
RSG · 1,254 data points
Lowest
-0.912
Fiserv, Inc. Common Stock
FISV · 644 data points
WBD
Warner Bros. Discovery, Inc. Series A Common Stock
Highest
+0.880
Johnson & Johnson
JNJ · 1,000 data points
Lowest
+0.077
Microsoft Corp
MSFT · 1,000 data points
Saved 6 hours ago · ID: stock-cost-vs-stock-wbd-daily