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Correlation Analysis

Costco Wholesale Corp vs Rocket Lab Corporation Common Stock

COST vs RKLB

+0.652

Strong positive

When one moves up, the other tends to follow.

COST logo

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

RKLB logo

Rocket Lab Corporation Common Stock

RKLB

Rocket Lab Corp is engaged in space, building rockets, and spacecraft. It provides end-to-end mission services that provide frequent and reliable access to space for civil, defense, and commercial markets. It designs and manufactures the Electron and Neutron launch vehicles and Photon satellite platform. Rocket Lab's Electron launch vehicle has delivered multiple satellites to orbit for private and public sector organizations, enabling operations in national security, scientific research, space debris mitigation, Earth observation, climate monitoring, and communications. The business operates in two segments Launch Services and Space Systems. Geographically it serves Japan, and rest of the world and earns key revenue from the United States.

Market cap 38.5B · 2,600 employees

Aug 25, 2021 — Apr 7, 2026Daily1,158 data pointsStockStockConsumer

Time Series

Relative Performance

Green: COSTGray: RKLB36 of 1,158 points (sampled)

Who Moves First

in sync

COST and RKLB tend to move at the same time.

After testing 13 timing shifts, the strongest relationship was +0.652 (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

+0.542

12 periods · Return correlation when both series rose

Both Falling

+0.393

7 periods · Return correlation when both series fell

Diverging

-0.611

16 periods · Return correlation when series moved apart

R-Squared

42.6%

Share of variance in one series explained by the other.

Trend Agreement

57.9%

How often both series moved in the same direction period-to-period.

Overlap Quality

1,158

Deep shared window — 1,158 usable pairs.

Significance

p < 0.001

95% CI: [0.618, 0.684]

Scatter

XY Regression

4015006007008009001,0001,060-1.902040608080.1Costco Wholesale CorpRocket Lab Corporation Common StockData pointsFit (r = 0.652)

Pipeline

Data quality details

Pipeline Summary

1,158 paired data points survived the daily window.

Raw input

1,254

1,158

Normalized

1,254

1,158

Prepared

1,254

1,158

Aligned

1,158

1,158

Invalid removed

0

A: 0 / B: 0

Duplicates removed

0

A: 0 / B: 0

Alignment drops

96

A: 96 / B: 0

Series A

COST logo

Costco Wholesale Corp

COST

Market cap 451.9B

Stock · 1,254 raw → 1,254 prepared

Series B

RKLB logo

Rocket Lab Corporation Common Stock

RKLB

Market cap 38.5B · 2,600 employees

Stock · 1,158 raw → 1,158 prepared

Sign agreement

100.0%

How often both values share the same sign.

Zero crossings

3

Estimated crossover points between normalized spreads.

Slope

0.0656

Linear regression slope.

Intercept

-28.6523

Linear regression intercept.

Related Extremes

Highest and Lowest Correlated

Saved 6 hours ago · ID: stock-cost-vs-stock-rklb-daily