Proto Labs Inc (PRLB)
Proto Labs, Inc., is an e-commerce-driven digital manufacturer of custom prototypes and on-demand production parts around the world. The company is headquartered in Maple Plain, Minnesota.
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 11.58% per annum.
- PRLB price at the close of April 29, 2025 was $35.41 and was inside the primary price channel.
- The secondary trend is decreasing.
- The decline rate of the secondary trend is 69.81% per annum.
- PRLB price at the close of April 29, 2025 was higher than the top border of the secondary price channel by $0.09 (0.26%). This indicates a possible reversal in the secondary trend direction.
- 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 PRLB 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: November 4, 2022
End date: April 29, 2025
a = 3.0641
b = 0.0003
s = 0.1268
Annual growth rate:
Exp(365 × b) – 1
= Exp(365 × 0.0003) – 1
= 11.58%
Price channel spread:
Exp(4 × s) – 1
= Exp(4 × 0.1268) – 1
= 66.07%
November 4, 2022 calculations
Top border of price channel:
Exp(Y635)
= Exp(a + b × X635 + 2 × s)
= Exp(a + b × 918 + 2 × s)
= Exp(3.0641 + 0.0003 × 918 + 2 × 0.1268)
= Exp(3.5934)
= $36.36
Bottom border of price channel:
Exp(Y635)
= Exp(a + b × X635 – 2 × s)
= Exp(a + b × 918 – 2 × s)
= Exp(3.0641 + 0.0003 × 918 – 2 × 0.1268)
= Exp(3.0861)
= $21.89
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(3.0641 + 0.0003 × 1,825 + 2 × 0.1268)
= Exp(3.8657)
= $47.74
Bottom border of price channel:
Exp(Y1,255)
= Exp(a + b × X1,255 – 2 × s)
= Exp(a + b × 1,825 – 2 × s)
= Exp(3.0641 + 0.0003 × 1,825 – 2 × 0.1268)
= Exp(3.3585)
= $28.75
Description
- The primary trend is increasing.
- The growth rate of the primary trend is 11.58% per annum.
- PRLB price at the close of April 29, 2025 was $35.41 and was inside the primary price channel.
Secondary Trend
Start date: January 28, 2025
End date: April 29, 2025
a = 9.4659
b = -0.0033
s = 0.0433
Annual growth rate:
Exp(365 × b) – 1
= Exp(365 × -0.0033) – 1
= -69.81%
Price channel spread:
Exp(4 × s) – 1
= Exp(4 × 0.0433) – 1
= 18.89%
January 28, 2025 calculations
Top border of price channel:
Exp(Y1,192)
= Exp(a + b × X1,192 + 2 × s)
= Exp(a + b × 1,734 + 2 × s)
= Exp(9.4659 + -0.0033 × 1,734 + 2 × 0.0433)
= Exp(3.8630)
= $47.61
Bottom border of price channel:
Exp(Y1,192)
= Exp(a + b × X1,192 – 2 × s)
= Exp(a + b × 1,734 – 2 × s)
= Exp(9.4659 + -0.0033 × 1,734 – 2 × 0.0433)
= Exp(3.6900)
= $40.04
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(9.4659 + -0.0033 × 1,825 + 2 × 0.0433)
= Exp(3.5644)
= $35.32
Bottom border of price channel:
Exp(Y1,255)
= Exp(a + b × X1,255 – 2 × s)
= Exp(a + b × 1,825 – 2 × s)
= Exp(9.4659 + -0.0033 × 1,825 – 2 × 0.0433)
= Exp(3.3914)
= $29.71
Description
- The secondary trend is decreasing.
- The decline rate of the secondary trend is 69.81% per annum.
- PRLB price at the close of April 29, 2025 was higher than the top border of the secondary price channel by $0.09 (0.26%). This indicates a possible reversal in the secondary trend direction.