Correlation Analysis
Bank of New York Mellon Corporation vs Costco Wholesale Corp
BK vs COST
+0.835
Strong positive
When one moves up, the other tends to follow.
Bank of New York Mellon Corporation
↗BK
Bank of New York Mellon is a global investment company involved in managing and servicing financial assets throughout the investment lifecycle. The bank provides financial services for institutions, corporations, and individual investors, delivering investment management and services in 35 countries and more than 100 markets. BNY is the largest global custody bank in the world, with $59.3 trillion in under custody or administration (as of December 2025), and can act as a single point of contact for clients looking to create, trade, hold, manage, service, distribute, or restructure investments. BNY's asset-management division manages about $2.2 trillion in assets.
Market cap 85.1B · 48,100 employees
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
Time Series
Relative Performance
Who Moves First
COST leads BK by 6 days
COST tends to move before BK.
After testing 13 timing shifts, the strongest relationship was +0.835 (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
+0.385
15 periods · Return correlation when both series rose
Both Falling
+0.580
5 periods · Return correlation when both series fell
Diverging
-0.693
15 periods · Return correlation when series moved apart
R-Squared
69.7%
Share of variance in one series explained by the other.
Trend Agreement
56.2%
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: [0.817, 0.851]
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
Bank of New York Mellon Corporation
BK
Market cap 85.1B · 48,100 employees
Stock · 1,254 raw → 1,254 prepared
Series B
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
5
Estimated crossover points between normalized spreads.
Slope
7.5241
Linear regression slope.
Intercept
197.2014
Linear regression intercept.
Related Extremes
Highest and Lowest Correlated
BK
Bank of New York Mellon Corporation
Highest
+0.969
JPMorgan Chase & Co.
JPM · 1,254 data points
Lowest
+0.507
Exxon Mobil Corporation
XOM · 1,254 data points
Saved 6 hours ago · ID: stock-bk-vs-stock-cost-daily