SeriesMagCorrOverlapThrough
These move opposite each other about 61% of the time
Strong inverse
Strong enough to use as a signal — read the stability and regime notes below before relying on it.
Pfizer is one of the world's largest pharmaceutical firms, with annual sales of roughly $60 billion. While it historically sold many types of healthcare products and chemicals, now prescription drugs and vaccines account for the majority of sales. Top sellers include pneumococcal vaccine Prevnar 13 and cardiology drugs Vyndaqel and Eliquis. Pfizer sells these products globally, with international sales representing 40% of total sales. Within international sales, emerging markets are a major contributor.
Market cap 152.4B · 75,000 employees
Southern is one of the largest utilities in the US. The company serves 9 million customers with vertically integrated electric utilities in three states and natural gas distribution utilities in four states. It owns 46 gigawatts of rate-regulated generating capacity, primarily for serving customers in Georgia, Alabama, and Mississippi. Subsidiary Southern Power owns 13 gigawatts of natural gas generation and renewable energy across the US and sells the electricity primarily under long-term contracts.
What to Watch
Unusual right now
Recent correlation (+32%) is 4.2σ from the long-run average of -68% — pair is behaving differently than usual.
Holds across regimes
Correlation is similar when markets rise (-12%) and fall (+24%) — reliable in both directions.
Flaky
Correlation swings widely across time windows — careful using this as a point estimate.
Time Series
Time-Shifted Correlation
See how correlation changes when one series is offset in time. A taller bar at a non-zero shift means the two move together better when one leads the other — that's a potential lead/lag signal.
Correlation by shift
Click a bar to inspect. Range: -6 to 6 days.
Selected shift
No shift
Correlation at this shift
-68%
No shift — both series at their actual dates.
1,255 overlapping points at this shift
Time series with The Southern Company at original dates
Indexed to 100 at start
Deep Dive
Stability
How the correlation evolves over time. A stable line means the relationship is reliable; large swings signal regime-dependent behavior.
Corr
-68%
Pearson correlation
95% CI
-71% → -65%
Likely range
R²
46.0%
Variance explained
Trend agreement
61.4%
Same-direction moves
Significance
p < 0.001
Statistical confidence
Data points
1,255
Deep
Pipeline
Pipeline Summary
1,255 paired data points survived the daily window.
Raw input
1,255
1,255
Normalized
1,255
1,255
Prepared
1,255
1,255
Aligned
1,255
1,255
Invalid removed
Explore
The strongest positive and inverse pairs we’ve saved for each side of this comparison — good jumping-off points if this result raised a question.
Market cap 106.4B · 29,800 employees
Do They Crash Together?
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
-12%
90 periods · Return correlation when both series rose
Both Falling
+24%
93 periods · Return correlation when both series fell
Diverging
-52%
66 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
0
A: 0 / B: 0
Series A
Pfizer Inc.
PFE
Market cap 152.4B · 75,000 employees
Stock · 1,255 raw → 1,255 prepared
Series B
The Southern Company
SO
Market cap 106.4B · 29,800 employees
Stock · 1,255 raw → 1,255 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
7
Estimated crossover points between normalized spreads.
Slope
-0.7210
Linear regression slope.
Intercept
102.5066
Linear regression intercept.
Saved 1 hour ago · ID: stock-pfe_stock-so_5y
SO
The Southern Company
Strongest positive