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Medline Inc. Class A common stock (MDLN) vs Portillo's Inc. Class A Common Stock (PTLO)
Correlation
of % moves
+30%
In sync
of periods
69%
History
daysdays · through 2026-09-04
180
These move in the same direction about 69% of the time
Their swing sizes only faintly line up (~9% of the pattern is shared).
Strong enough to use as a signal — check the stability and regime notes below before relying on it.
Both lines start at the same point — easy to compare when growth rates are similar.
What to Watch
Slipping tighter
The recent pattern is tighter than its long-run baseline — keep an eye on whether this sticks.
Holds in both up and down markets
The relationship is similar whether prices are rising or falling — reliable in both directions.
Rock solid
The relationship barely changes from period to period — treat it as a reliable signal.
Advanced
Statistics
In sync(i)
69%
Headline metric
Movement correlation(i)
+30%
Based on % moves
95% CI
+16% → +43%
Likely range of correlation
Pipeline
Pipeline Summary
180 paired data points survived the daily window.
Raw input
180
1,223
Normalized
180
1,223
Prepared
180
1,223
Aligned
180
180
Invalid removed
R²(i)
9%
Variance explained
Significance
p < 0.001
Statistical confidence
Data points(i)
179
Usable
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
+30%
No shift — both series at their actual dates.
179 overlapping points at this shift
Baseline
+30%
No-shift correlation, matching the main time-series chart above.
Peak shift
No shift
+30%
A non-zero peak suggests one series lines up better when shifted against the other.
Stability
How the correlation evolves over time. A stable line means the relationship is reliable; large swings signal regime-dependent behavior.
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
-16%
58 periods · Return correlation when both series rose
Both Falling
+11%
63 periods · Return correlation when both series fell
Diverging
-43%
58 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
1,043
A: 0 / B: 1043
Series A
Medline Inc. Class A common stock (MDLN)
MDLN
Stock · 180 raw → 180 prepared
Series B
Portillo's Inc. Class A Common Stock (PTLO)
PTLO
Stock · 1,223 raw → 1,223 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
17
Estimated crossover points between normalized spreads.
Slope
0.3653
Linear regression slope.
Intercept
-0.0001
Linear regression intercept.
Saved 4 months ago · ID: stock-mdln_stock-ptlo_daily_5y