Correlation Analysis
Costco Wholesale Corp vs Rocket Companies, Inc.
COST vs RKT
+0.372
Light 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
Rocket Companies, Inc.
↗RKT
Rocket Companies is a financial services company that was originally founded as Rock Financial in 1985 and is currently based in Detroit. Rocket Companies offers a wide array of services and products but is best known for its Rocket Mortgage business. The company's mortgage lending operations are split between its direct-to-consumer lending, which sees borrowers accessing the company's lending arm directly through either its mobile app or website, and its partner network where mortgage brokers and other firms use Rocket's origination process to offer loans to their customers. The company has rapidly gained market share in recent years and will also be the largest mortgage servicer in the US following its acquisition of the Mr. Cooper Group.
Market cap 42.4B · 23,500 employees
Time Series
Relative Performance
Who Moves First
COST leads RKT by 6 days
COST tends to move before RKT.
After testing 13 timing shifts, the strongest relationship was +0.385 (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
+0.015
10 periods · Return correlation when both series rose
Both Falling
-0.507
6 periods · Return correlation when both series fell
Diverging
-0.686
19 periods · Return correlation when series moved apart
R-Squared
13.9%
Share of variance in one series explained by the other.
Trend Agreement
58.4%
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: [0.324, 0.419]
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
Costco Wholesale Corp
COST
Market cap 451.9B
Stock · 1,254 raw → 1,254 prepared
Series B
Rocket Companies, Inc.
RKT
Market cap 42.4B · 23,500 employees
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
0.0073
Linear regression slope.
Intercept
8.3006
Linear regression intercept.
Related Extremes
Highest and Lowest Correlated
Saved 7 hours ago · ID: stock-cost-vs-stock-rkt-daily