Correlation Analysis
Costco Wholesale Corp vs Nextpower Inc. Class A Common Stock
COST vs NXT
+0.504
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
Nextpower Inc. Class A Common Stock
↗NXT
Nextpower (and its subsidiaries) is a leading provider of intelligent, integrated solar tracker and software solutions used in utility-scale and distributed generation solar projects around the world. Nextpower's products enable solar panels in utility-scale power plants to follow the sun's movement across the sky and optimize plant performance. Nextpower has operations in the United States, Mexico, Spain and other countries in Europe, India, Australia, the Middle East, Africa, and Brazil.
Market cap 16B · 1,300 employees
Time Series
Relative Performance
Who Moves First
in sync
COST and NXT tend to move at the same time.
After testing 13 timing shifts, the strongest relationship was +0.504 (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
+0.518
16 periods · Return correlation when both series rose
Both Falling
-0.222
8 periods · Return correlation when both series fell
Diverging
-0.849
11 periods · Return correlation when series moved apart
R-Squared
25.4%
Share of variance in one series explained by the other.
Trend Agreement
50.4%
How often both series moved in the same direction period-to-period.
Overlap Quality
791
Deep shared window — 791 usable pairs.
Significance
p < 0.001
95% CI: [0.450, 0.554]
Scatter
XY Regression
Pipeline
Data quality details
Pipeline
Data quality details
Pipeline Summary
791 paired data points survived the daily window.
Raw input
1,254
791
Normalized
1,254
791
Prepared
1,254
791
Aligned
791
791
Invalid removed
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
463
A: 463 / B: 0
Series A
Costco Wholesale Corp
COST
Market cap 451.9B
Stock · 1,254 raw → 1,254 prepared
Series B
Nextpower Inc. Class A Common Stock
NXT
Market cap 16B · 1,300 employees
Stock · 791 raw → 791 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
3
Estimated crossover points between normalized spreads.
Slope
0.0639
Linear regression slope.
Intercept
2.9798
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
NXT
Nextpower Inc. Class A Common Stock
Highest
+0.932
Micron Technology, Inc.
MU · 791 data points
Lowest
+0.505
Microsoft Corp
MSFT · 791 data points
Saved 4 hours ago · ID: stock-cost-vs-stock-nxt-daily