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BB Biotech AG Asymmetric ILLIQ Liquidity Analysis

High-persistence model: shocks decay very slowly, so the theoretical long-run value may not be practically meaningful

Illiquidity prediction for Monday, August 24th, 2026

1 Day

2,179.96

increased by 106.87

1 Week

2,138.37

increased by 65.28

1 Month

2,400.62

increased by 327.53

Analysis last updated: Sunday, August 23, 2026 at 03:43 AM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

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graph of BB Biotech AG ILLIQ-AMEM

News Impact Curve

How returns affect tomorrow's illiquidity

Illiquidity Forecast

How illiquidity evolves over time

Parameter Estimates

Nov 15, 1993 to Aug 21, 2026

Model Insight

With persistence 1.000, illiquidity shocks have a half-life of 1386294 trading days (~5501.2 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.

Asymmetry: Illiquidity rises 92% more after negative returns

μ

ILLIQ-AMEM Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

5.0000
3.96***
α

ARCH

Response to squared shocks

0.0606
21.83***
β

GARCH

Volatility persistence

0.9115
648.27***
γ

leverage

Additional response to negative shocks

0.0559
11.35***

Persistence:

1.000

Half-life:

1386294 days