Greenbrier Companies Inc (GBX)
The Greenbrier Companies, Inc. designs, manufactures and markets rail freight car equipment in North America, Europe and South America. The company is headquartered in Lake Oswego, Oregon.
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 41.95% per annum.
- GBX price at the close of April 29, 2025 was $42.56 and was lower than the bottom border of the primary price channel by $9.44 (18.15%). This indicates a possible reversal in the primary trend direction.
- The secondary trend is decreasing.
- The decline rate of the secondary trend is 84.62% per annum.
- GBX price at the close of April 29, 2025 was inside the secondary price channel.
- The direction of the secondary trend is opposite to the direction of the primary trend. This indicates a possible reversal in the direction of the primary trend.
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 GBX 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: July 11, 2022
End date: February 28, 2025
a = 2.4467
b = 0.0010
s = 0.1235
Annual growth rate:
Exp(365 × b) – 1
= Exp(365 × 0.0010) – 1
= 41.95%
Price channel spread:
Exp(4 × s) – 1
= Exp(4 × 0.1235) – 1
= 63.86%
July 11, 2022 calculations
Top border of price channel:
Exp(Y552)
= Exp(a + b × X552 + 2 × s)
= Exp(a + b × 802 + 2 × s)
= Exp(2.4467 + 0.0010 × 802 + 2 × 0.1235)
= Exp(3.4633)
= $31.92
Bottom border of price channel:
Exp(Y552)
= Exp(a + b × X552 – 2 × s)
= Exp(a + b × 802 – 2 × s)
= Exp(2.4467 + 0.0010 × 802 – 2 × 0.1235)
= Exp(2.9694)
= $19.48
February 28, 2025 calculations
Top border of price channel:
Exp(Y1,214)
= Exp(a + b × X1,214 + 2 × s)
= Exp(a + b × 1,765 + 2 × s)
= Exp(2.4467 + 0.0010 × 1,765 + 2 × 0.1235)
= Exp(4.3874)
= $80.43
Bottom border of price channel:
Exp(Y1,214)
= Exp(a + b × X1,214 – 2 × s)
= Exp(a + b × 1,765 – 2 × s)
= Exp(2.4467 + 0.0010 × 1,765 – 2 × 0.1235)
= Exp(3.8936)
= $49.09
Description
- The primary trend is increasing.
- The growth rate of the primary trend is 41.95% per annum.
- GBX price at the close of April 29, 2025 was $42.56 and was lower than the bottom border of the primary price channel by $9.44 (18.15%). This indicates a possible reversal in the primary trend direction.
Secondary Trend
Start date: January 14, 2025
End date: April 29, 2025
a = 13.0788
b = -0.0051
s = 0.0521
Annual growth rate:
Exp(365 × b) – 1
= Exp(365 × -0.0051) – 1
= -84.62%
Price channel spread:
Exp(4 × s) – 1
= Exp(4 × 0.0521) – 1
= 23.19%
January 14, 2025 calculations
Top border of price channel:
Exp(Y1,183)
= Exp(a + b × X1,183 + 2 × s)
= Exp(a + b × 1,720 + 2 × s)
= Exp(13.0788 + -0.0051 × 1,720 + 2 × 0.0521)
= Exp(4.3609)
= $78.33
Bottom border of price channel:
Exp(Y1,183)
= Exp(a + b × X1,183 – 2 × s)
= Exp(a + b × 1,720 – 2 × s)
= Exp(13.0788 + -0.0051 × 1,720 – 2 × 0.0521)
= Exp(4.1524)
= $63.58
April 29, 2025 calculations
Top border of price channel:
Exp(Y1,255)
= Exp(a + b × X1,255 + 2 × s)
= Exp(a + b × 1,825 + 2 × s)
= Exp(13.0788 + -0.0051 × 1,825 + 2 × 0.0521)
= Exp(3.8223)
= $45.71
Bottom border of price channel:
Exp(Y1,255)
= Exp(a + b × X1,255 – 2 × s)
= Exp(a + b × 1,825 – 2 × s)
= Exp(13.0788 + -0.0051 × 1,825 – 2 × 0.0521)
= Exp(3.6138)
= $37.11
Description
- The secondary trend is decreasing.
- The decline rate of the secondary trend is 84.62% per annum.
- GBX price at the close of April 29, 2025 was inside the secondary price channel.