West Pharmaceutical Services Inc (WST)
West Pharmaceutical Services, Inc. is a leading developer and manufacturer of innovative injectable pharmaceutical packaging and delivery systems, serving the global healthcare market. Headquartered in Exton, Pennsylvania, the company specializes in providing integrated solutions that enhance the safety, reliability, and effectiveness of drug delivery. With a strong commitment to quality and technological advancement, West partners with pharmaceutical and biotechnology firms to optimize the life cycle of injectables, ultimately improving patient outcomes and streamlining the drug administration process.
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 60.02% per annum.
- WST price at the close of January 12, 2026 was $272.91 and was inside the primary price channel.
- The secondary trend is decreasing.
- The decline rate of the secondary trend is 9.39% per annum.
- WST price at the close of January 12, 2026 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 WST 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: April 4, 2025
End date: January 9, 2026
a = 3.3275
b = 0.0013
s = 0.0400
Annual growth rate:
Exp(365 × b) – 1
= Exp(365 × 0.0013) – 1
= 60.02%
Price channel spread:
Exp(4 × s) – 1
= Exp(4 × 0.0400) – 1
= 17.33%
April 4, 2025 calculations
Top border of price channel:
Exp(Y1,061)
= Exp(a + b × X1,061 + 2 × s)
= Exp(a + b × 1,542 + 2 × s)
= Exp(3.3275 + 0.0013 × 1,542 + 2 × 0.0400)
= Exp(5.3936)
= $220.00
Bottom border of price channel:
Exp(Y1,061)
= Exp(a + b × X1,061 – 2 × s)
= Exp(a + b × 1,542 – 2 × s)
= Exp(3.3275 + 0.0013 × 1,542 – 2 × 0.0400)
= Exp(5.2338)
= $187.50
January 9, 2026 calculations
Top border of price channel:
Exp(Y1,253)
= Exp(a + b × X1,253 + 2 × s)
= Exp(a + b × 1,822 + 2 × s)
= Exp(3.3275 + 0.0013 × 1,822 + 2 × 0.0400)
= Exp(5.7543)
= $315.54
Bottom border of price channel:
Exp(Y1,253)
= Exp(a + b × X1,253 – 2 × s)
= Exp(a + b × 1,822 – 2 × s)
= Exp(3.3275 + 0.0013 × 1,822 – 2 × 0.0400)
= Exp(5.5944)
= $268.92
Description
- The primary trend is increasing.
- The growth rate of the primary trend is 60.02% per annum.
- WST price at the close of January 12, 2026 was $272.91 and was inside the primary price channel.
Secondary Trend
Start date: October 17, 2025
End date: January 12, 2026
a = 6.0984
b = -0.0003
s = 0.0297
Annual growth rate:
Exp(365 × b) – 1
= Exp(365 × -0.0003) – 1
= -9.39%
Price channel spread:
Exp(4 × s) – 1
= Exp(4 × 0.0297) – 1
= 12.63%
October 17, 2025 calculations
Top border of price channel:
Exp(Y1,196)
= Exp(a + b × X1,196 + 2 × s)
= Exp(a + b × 1,738 + 2 × s)
= Exp(6.0984 + -0.0003 × 1,738 + 2 × 0.0297)
= Exp(5.6884)
= $295.41
Bottom border of price channel:
Exp(Y1,196)
= Exp(a + b × X1,196 – 2 × s)
= Exp(a + b × 1,738 – 2 × s)
= Exp(6.0984 + -0.0003 × 1,738 – 2 × 0.0297)
= Exp(5.5694)
= $262.27
January 12, 2026 calculations
Top border of price channel:
Exp(Y1,254)
= Exp(a + b × X1,254 + 2 × s)
= Exp(a + b × 1,825 + 2 × s)
= Exp(6.0984 + -0.0003 × 1,825 + 2 × 0.0297)
= Exp(5.6649)
= $288.55
Bottom border of price channel:
Exp(Y1,254)
= Exp(a + b × X1,254 – 2 × s)
= Exp(a + b × 1,825 – 2 × s)
= Exp(6.0984 + -0.0003 × 1,825 – 2 × 0.0297)
= Exp(5.5459)
= $256.18
Description
- The secondary trend is decreasing.
- The decline rate of the secondary trend is 9.39% per annum.
- WST price at the close of January 12, 2026 was inside the secondary price channel.