Donaldson Company Inc (DCI)
Donaldson Company, Inc. (DCI) is a leading global manufacturer of filtration systems and replacement parts, offering innovative products that enhance air and liquid filtration in various industries, including industrial, aerospace, and transportation. Headquartered in Bloomington, Minnesota, Donaldson leverages advanced technology and robust research capabilities to deliver high-performance solutions that meet stringent regulatory standards. With a strong commitment to sustainability and operational excellence, the company continues to expand its market presence through strategic growth initiatives and a focus on customer satisfaction.
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 76.12% per annum.
- DCI price at the close of February 23, 2026 was $106.76 and was inside the primary price channel.
- The secondary trend is increasing.
- The growth rate of the secondary trend is 352.11% per annum.
- DCI price at the close of February 23, 2026 was lower than the bottom border of the secondary price channel by $2.87 (2.62%). This indicates a possible reversal in the secondary trend direction.
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 DCI 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 3, 2025
End date: February 3, 2026
a = 1.7905
b = 0.0016
s = 0.0272
Annual growth rate:
Exp(365 × b) – 1
= Exp(365 × 0.0016) – 1
= 76.12%
Price channel spread:
Exp(4 × s) – 1
= Exp(4 × 0.0272) – 1
= 11.50%
April 3, 2025 calculations
Top border of price channel:
Exp(Y1,032)
= Exp(a + b × X1,032 + 2 × s)
= Exp(a + b × 1,499 + 2 × s)
= Exp(1.7905 + 0.0016 × 1,499 + 2 × 0.0272)
= Exp(4.1694)
= $64.68
Bottom border of price channel:
Exp(Y1,032)
= Exp(a + b × X1,032 – 2 × s)
= Exp(a + b × 1,499 – 2 × s)
= Exp(1.7905 + 0.0016 × 1,499 – 2 × 0.0272)
= Exp(4.0606)
= $58.01
February 3, 2026 calculations
Top border of price channel:
Exp(Y1,241)
= Exp(a + b × X1,241 + 2 × s)
= Exp(a + b × 1,805 + 2 × s)
= Exp(1.7905 + 0.0016 × 1,805 + 2 × 0.0272)
= Exp(4.6440)
= $103.96
Bottom border of price channel:
Exp(Y1,241)
= Exp(a + b × X1,241 – 2 × s)
= Exp(a + b × 1,805 – 2 × s)
= Exp(1.7905 + 0.0016 × 1,805 – 2 × 0.0272)
= Exp(4.5352)
= $93.24
Description
- The primary trend is increasing.
- The growth rate of the primary trend is 76.12% per annum.
- DCI price at the close of February 23, 2026 was $106.76 and was inside the primary price channel.
Secondary Trend
Start date: December 23, 2025
End date: February 17, 2026
a = -2.8062
b = 0.0041
s = 0.0202
Annual growth rate:
Exp(365 × b) – 1
= Exp(365 × 0.0041) – 1
= 352.11%
Price channel spread:
Exp(4 × s) – 1
= Exp(4 × 0.0202) – 1
= 8.44%
December 23, 2025 calculations
Top border of price channel:
Exp(Y1,214)
= Exp(a + b × X1,214 + 2 × s)
= Exp(a + b × 1,763 + 2 × s)
= Exp(-2.8062 + 0.0041 × 1,763 + 2 × 0.0202)
= Exp(4.5218)
= $92.00
Bottom border of price channel:
Exp(Y1,214)
= Exp(a + b × X1,214 – 2 × s)
= Exp(a + b × 1,763 – 2 × s)
= Exp(-2.8062 + 0.0041 × 1,763 – 2 × 0.0202)
= Exp(4.4408)
= $84.85
February 17, 2026 calculations
Top border of price channel:
Exp(Y1,250)
= Exp(a + b × X1,250 + 2 × s)
= Exp(a + b × 1,819 + 2 × s)
= Exp(-2.8062 + 0.0041 × 1,819 + 2 × 0.0202)
= Exp(4.7533)
= $115.97
Bottom border of price channel:
Exp(Y1,250)
= Exp(a + b × X1,250 – 2 × s)
= Exp(a + b × 1,819 – 2 × s)
= Exp(-2.8062 + 0.0041 × 1,819 – 2 × 0.0202)
= Exp(4.6723)
= $106.94
Description
- The secondary trend is increasing.
- The growth rate of the secondary trend is 352.11% per annum.
- DCI price at the close of February 23, 2026 was lower than the bottom border of the secondary price channel by $2.87 (2.62%). This indicates a possible reversal in the secondary trend direction.