Group 1 Automotive Inc (GPI)
Group 1 Automotive, Inc., operates in the automotive retail industry. The company is headquartered in Houston, Texas.
Stock Price Trends
Stock price trends estimated using linear regression.
Key facts
- The primary trend is increasing.
- The growth rate of the primary trend is 44.80% per annum.
- GPI price at the close of August 13, 2025 was $459.54 and was inside the primary price channel.
- The secondary trend is increasing.
- The growth rate of the secondary trend is 1.84% per annum.
- GPI price at the close of August 13, 2025 was inside the secondary price channel.
Linear Regression Model
Model equation:
Yi = α + β × Xi + εi
Top border of price channel:
Exp(Yi) = Exp(a + b × Xi + 2 × s)
Bottom border of price channel:
Exp(Yi) = Exp(a + b × Xi – 2 × s)
where:
i - observation number
Yi - natural logarithm of GPI price
Xi - time index, 1 day interval
σ - standard deviation of εi
a - estimator of α
b - estimator of β
s - estimator of σ
Exp() - calculates the exponent of e
Primary Trend
Start date: June 16, 2022
End date: March 12, 2025
a = 4.3757
b = 0.0010
s = 0.0760
Annual growth rate:
Exp(365 × b) – 1
= Exp(365 × 0.0010) – 1
= 44.80%
Price channel spread:
Exp(4 × s) – 1
= Exp(4 × 0.0760) – 1
= 35.52%
June 16, 2022 calculations
Top border of price channel:
Exp(Y463)
= Exp(a + b × X463 + 2 × s)
= Exp(a + b × 671 + 2 × s)
= Exp(4.3757 + 0.0010 × 671 + 2 × 0.0760)
= Exp(5.2082)
= $182.76
Bottom border of price channel:
Exp(Y463)
= Exp(a + b × X463 – 2 × s)
= Exp(a + b × 671 – 2 × s)
= Exp(4.3757 + 0.0010 × 671 – 2 × 0.0760)
= Exp(4.9043)
= $134.86
March 12, 2025 calculations
Top border of price channel:
Exp(Y1,148)
= Exp(a + b × X1,148 + 2 × s)
= Exp(a + b × 1,671 + 2 × s)
= Exp(4.3757 + 0.0010 × 1,671 + 2 × 0.0760)
= Exp(6.2224)
= $503.90
Bottom border of price channel:
Exp(Y1,148)
= Exp(a + b × X1,148 – 2 × s)
= Exp(a + b × 1,671 – 2 × s)
= Exp(4.3757 + 0.0010 × 1,671 – 2 × 0.0760)
= Exp(5.9185)
= $371.84
Description
- The primary trend is increasing.
- The growth rate of the primary trend is 44.80% per annum.
- GPI price at the close of August 13, 2025 was $459.54 and was inside the primary price channel.
Secondary Trend
Start date: November 6, 2024
End date: August 12, 2025
a = 5.9721
b = 0.0000
s = 0.0556
Annual growth rate:
Exp(365 × b) – 1
= Exp(365 × 0.0000) – 1
= 1.84%
Price channel spread:
Exp(4 × s) – 1
= Exp(4 × 0.0556) – 1
= 24.92%
November 6, 2024 calculations
Top border of price channel:
Exp(Y1,064)
= Exp(a + b × X1,064 + 2 × s)
= Exp(a + b × 1,545 + 2 × s)
= Exp(5.9721 + 0.0000 × 1,545 + 2 × 0.0556)
= Exp(6.1604)
= $473.60
Bottom border of price channel:
Exp(Y1,064)
= Exp(a + b × X1,064 – 2 × s)
= Exp(a + b × 1,545 – 2 × s)
= Exp(5.9721 + 0.0000 × 1,545 – 2 × 0.0556)
= Exp(5.9379)
= $379.12
August 12, 2025 calculations
Top border of price channel:
Exp(Y1,253)
= Exp(a + b × X1,253 + 2 × s)
= Exp(a + b × 1,824 + 2 × s)
= Exp(5.9721 + 0.0000 × 1,824 + 2 × 0.0556)
= Exp(6.1743)
= $480.23
Bottom border of price channel:
Exp(Y1,253)
= Exp(a + b × X1,253 – 2 × s)
= Exp(a + b × 1,824 – 2 × s)
= Exp(5.9721 + 0.0000 × 1,824 – 2 × 0.0556)
= Exp(5.9518)
= $384.43
Description
- The secondary trend is increasing.
- The growth rate of the secondary trend is 1.84% per annum.
- GPI price at the close of August 13, 2025 was inside the secondary price channel.