Correlation Analysis
Costco Wholesale Corp vs Marsh
COST vs MRSH
-0.293
Light inverse
When one moves up, the other tends to move down.
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
Marsh
↗MRSH
Marsh McLennan is a professional services firm that provides advice and solutions in the areas of risk, strategy, and human capital. The company operates through two main segments: risk and insurance services and consulting. In risk and insurance services, the firm offers services via Marsh (an insurance broker) and Guy Carpenter (a risk and reinsurance specialist). The consulting division comprises Mercer (a provider of human resource services) and Oliver Wyman (a management and economic consultancy). About half of its revenue is generated outside the US.
Market cap 84.5B · 55,700 employees
Time Series
Relative Performance
Who Moves First
COST leads MRSH by 2 days
COST tends to move before MRSH.
After testing 13 timing shifts, the strongest relationship was -0.337 (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
-0.288
9 periods · Return correlation when both series rose
Both Falling
+0.353
11 periods · Return correlation when both series fell
Diverging
-0.714
15 periods · Return correlation when series moved apart
R-Squared
8.6%
Share of variance in one series explained by the other.
Trend Agreement
46.4%
How often both series moved in the same direction period-to-period.
Overlap Quality
57
Thin shared window — 57 usable pairs.
Significance
p < 0.05
95% CI: [-0.514, -0.035]
Scatter
XY Regression
Pipeline
Data quality details
Pipeline
Data quality details
Pipeline Summary
57 paired data points survived the daily window.
Raw input
1,254
57
Normalized
1,254
57
Prepared
1,254
57
Aligned
57
57
Invalid removed
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
1,197
A: 1197 / B: 0
Series A
Costco Wholesale Corp
COST
Market cap 451.9B
Stock · 1,254 raw → 1,254 prepared
Series B
Marsh
MRSH
Market cap 84.5B · 55,700 employees
Stock · 57 raw → 57 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
11
Estimated crossover points between normalized spreads.
Slope
-0.0934
Linear regression slope.
Intercept
270.8337
Linear regression intercept.
Related Extremes
Highest and Lowest Correlated
Saved 7 hours ago · ID: stock-cost-vs-stock-mrsh-daily