V-Lab
Arko Corp Spline ILLIQ Liquidity Analysis
Illiquidity prediction for Monday, September 14th, 2026
1 Day
4,053.85
decreased by 76.09
1 Week
4,164.99
increased by 35.05
1 Month
4,239.25
increased by 109.31
Analysis last updated: Friday, September 11, 2026 at 10:13 PM UTC
News Impact Curve
How returns affect tomorrow's illiquidityIlliquidity Forecast
How illiquidity evolves over timeParameter Estimates
Jul 23, 2019 to Sep 11, 2026Model Insight
This model fits a time-varying baseline (a spline), so illiquidity mean-reverts toward a slowly-shifting long-run level rather than a constant. Short-run deviations decay with a half-life of 6 trading days.
μ
ILLIQ-SMEM Model
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Time-varying baseline: illiquidity reverts to a slowly-shifting spline trend
| Param | Value | t-stat |
|---|---|---|
| ωconst | 1.1844 | 1.58 |
| αARCH | 0.0244 | 1.14 |
| βGARCH | 0.8583 | 9.66*** |
Spline Coefficients
K=8
| γ1 | -7.5641 | -2.36** |
| γ2 | 11.6617 | 2.75*** |
| γ3 | -4.8145 | -3.05*** |
| γ4 | 0.9996 | 1.33 |
| γ5 | -0.3276 | -0.74 |
| γ6 | -0.0007 | 0.00 |
| γ7 | -0.2146 | -0.53 |
| γ8 | -0.2301 | -0.37 |
0.883
Persistence6d
Half-lifeμ
ILLIQ-SMEM Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.1844 | 1.58 |
α ARCH Response to squared shocks | 0.0244 | 1.14 |
β GARCH Volatility persistence | 0.8583 | 9.66*** |
Spline Coefficients
K=8
| γ1 | -7.5641 | -2.36** |
| γ2 | 11.6617 | 2.75*** |
| γ3 | -4.8145 | -3.05*** |
| γ4 | 0.9996 | 1.33 |
| γ5 | -0.3276 | -0.74 |
| γ6 | -0.0007 | 0.00 |
| γ7 | -0.2146 | -0.53 |
| γ8 | -0.2301 | -0.37 |
Persistence:
0.883
Half-life:
6 days
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