Correlation Analysis
Costco Wholesale Corp vs Principal Financial Group, Inc.
COST vs PFG
+0.598
Moderate 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
Principal Financial Group, Inc.
↗PFG
Principal Financial Group Inc is a financial services provider. It offers various financial products and services including retirement, asset management, and workplace benefits and protection solutions to individuals and institutional clients. The company, along with its subsidiaries, operates in the following reportable segments; Retirement and Income Solutions, Principal Asset Management, and Benefits and Protection. Maximum revenue is generated from the Retirement and Income Solutions segment which provides workplace savings and retirement solutions, banking, trust and custodial services, individual variable annuities (including RILAs), pension risk transfer, and investment services to businesses, their employees, and other individuals.
Market cap 19.8B · 19,700 employees
Time Series
Relative Performance
Who Moves First
in sync
COST and PFG tend to move at the same time.
After testing 13 timing shifts, the strongest relationship was +0.598 (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
+0.149
15 periods · Return correlation when both series rose
Both Falling
-0.111
5 periods · Return correlation when both series fell
Diverging
-0.672
15 periods · Return correlation when series moved apart
R-Squared
35.7%
Share of variance in one series explained by the other.
Trend Agreement
58.1%
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: [0.561, 0.632]
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
Principal Financial Group, Inc.
PFG
Market cap 19.8B · 19,700 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
0.0228
Linear regression slope.
Intercept
61.8680
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
PFG
Principal Financial Group, Inc.
Highest
+0.788
Exxon Mobil Corporation
XOM · 1,254 data points
Lowest
+0.224
Tesla, Inc. Common Stock
TSLA · 1,254 data points
Saved 7 hours ago · ID: stock-cost-vs-stock-pfg-daily