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Correlation
of % moves
+2%
In sync
of periods
52%
History
daysdays · through 2026-05-22
588
These move in the same direction about 52% of the time
Their swing sizes barely line up — almost no shared pattern.
Roughly random — these don't track each other in a meaningful way.
On a log scale so equal % moves take equal vertical space — best when one series has grown much faster than the other.
What to Watch
Unusual right now
Recently tighter than usual — the pair is behaving differently than its long-run pattern.
BRK.B moves ~5 days before VELO
Watch BRK.B for an early read on VELO.
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)
52.5%
Headline metric
Movement correlation(i)
+2%
Based on % moves
95% CI
-7% → +10%
Likely range of correlation
Pipeline
Pipeline Summary
588 paired data points survived the daily window.
Raw input
1,253
588
Normalized
1,253
588
Prepared
1,253
588
Aligned
588
588
Invalid removed
R²(i)
0.0%
Variance explained
Significance
n.s.
Statistical confidence
Data points
588
Robust
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
+5 days
Correlation at this shift
+7%
+6% stronger than no-shift baseline
Velo3D, Inc. Common stock (VELO) shifted 5 days earlier. Reads: "Does BERKSHIRE HATHAWAY Class B (BRK.B) today line up with Velo3D, Inc. Common stock (VELO) 5 days from now?"
576 overlapping points at this shift
Baseline
+2%
No-shift correlation, matching the main time-series chart above.
Peak shift
+5 days
+7%
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
-14%
71 periods · Return correlation when both series rose
Both Falling
+11%
58 periods · Return correlation when both series fell
Diverging
-30%
118 periods · Return correlation when series moved apart
Scatter
0
A: 0 / B: 0
Duplicates removed
0
A: 0 / B: 0
Alignment drops
665
A: 665 / B: 0
Series A
BERKSHIRE HATHAWAY Class B (BRK.B)
BRK.B
Stock · 1,253 raw → 1,253 prepared
Series B
Velo3D, Inc. Common stock (VELO)
VELO
Stock · 588 raw → 588 prepared
Sign agreement
100.0%
How often both values share the same sign.
Zero crossings
1
Estimated crossover points between normalized spreads.
Slope
0.0903
Linear regression slope.
Intercept
0.0033
Linear regression intercept.
Saved 2 weeks ago · ID: stock-brk.b_stock-velo_daily_5y