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TransMedics Group, Inc. GJR-GARCH Volatility Analysis

Volatility prediction for Monday, September 21st, 2026

1 Day

57.12%

decreased by 1.30%

1 Week

63.80%

increased by 5.38%

1 Month

70.80%

increased by 12.38%

Analysis last updated: Friday, September 18, 2026 at 10:56 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

All

graph of TransMedics Group, Inc. GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

May 2, 2019 to Sep 18, 2026
Boundary Parameters

Model Insight

Volatility shocks decay with a half-life of 3 trading days, meaning a shock loses half its impact after approximately 3 days.

σ

GJR-GARCH Model

Tap to view equation

Shock decay: Shocks decay with a 3-day half-life
ParamValuet-stat
ωconst5.0000
2.63***
αARCH0.1010
1.72*
βGARCH0.5852
4.70***
γleverage0.1667
1.00

0.770

Persistence

3d

Half-life
σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

5.0000
2.63***
α

ARCH

Response to squared shocks

0.1010
1.72*
β

GARCH

Volatility persistence

0.5852
4.70***
γ

leverage

Additional response to negative shocks

0.1667
1.00

Persistence:

0.770

Half-life:

3 days