GHC GRAHAM HOLDINGS COMPANY

together opposite · bar = ρ at each lag, −10 … 0 … +10 days · holdout ρ · click a card for the full picture

GHC vs LOPE

Both indexed to 100 at 2026-05-11.

GHC LOPE · range 73–113 · 2026-05-11 → 2026-11-06

These tend to repeat GHC's moves later.

FRPH FRP Holdings, Inc. Common Stock

lag 1dρ -0.24holdout -0.27stable 88%$/day $1.3Mrobust

Same day, ranked by what's left after the market and sector factors are removed ("beyond mkt").

LOPE Grand Canyon Education, Inc. Common Stock

ρ +0.46beyond mkt +0.24holdout +0.49stable 100%robust

LAUR Laureate Education, Inc. Common Stock

ρ +0.37beyond mkt +0.22holdout +0.31stable 88%robust

CVSA Covista Inc.

ρ +0.40beyond mkt +0.22holdout +0.34stable 88%robust

STRA Strategic Education, Inc. Common Stock

ρ +0.45beyond mkt +0.22holdout +0.43stable 100%robust

PRDO Perdoceo Education Corporation Common Stock

ρ +0.41beyond mkt +0.21holdout +0.41stable 100%robust

FOXA Fox Corporation Class A Common Stock

ρ +0.42beyond mkt +0.20holdout +0.44stable 88%robust

VXX iPath Series B S&P 500 VIX Short-Term Futures ETN

ρ -0.33beyond mkt +0.01holdout -0.09stable 75%moderate

No day-to-day relationship, but 5- or 10-day returns move together.

KE Kimball Electronics, Inc. Common Stock

horizon 10dρ +0.41holdout +0.19stable 62%moderate

Biggest shifts in same-day correlation over the last 63 trading days versus the year before.

AROC Archrock Inc

Δ -0.67recent -0.39prior +0.28beyond mkt +0.08

PRLB PROTO LABS, INC.

Δ -0.66recent -0.29prior +0.37beyond mkt +0.01

FLS Flowserve Corporation

Δ -0.65recent -0.28prior +0.36beyond mkt +0.01

NGS Natural Gas Services Group, Inc.

Δ -0.64recent -0.42prior +0.22beyond mkt +0.05

MTRN Materion Corporation

Δ -0.61recent -0.35prior +0.27beyond mkt -0.04

BAND Bandwidth Inc. Class A Common Stock

Δ -0.61recent -0.31prior +0.29beyond mkt -0.02

Abnormal volume rises and falls on the same days as GHC's, while prices do not move together: the same hands, not the same business.

Symbol	traded together ρ	big prints together ρ	priced together ρ	q
COLB Columbia Banking System, Inc. Common Stock	+0.35	+0.33	-0.01	8e-12
CLBK Columbia Financial, Inc. Common Stock	+0.33	+0.33	-0.00	1e-10
YARW Yarrow Bioscience, Inc. Common Stock	+0.33	+0.26	+0.00	6e-11
HTB HomeTrust Bancshares, Inc.	+0.36	+0.23	+0.04	8e-13
GSIW Garden Stage Limited Class A Ordinary Shares	+0.36	+0.23	+0.05	1e-12
KNF Knife River Corporation	+0.38	+0.18	+0.05	<1e-15