Tandem Diabetes Care Inc (TNDM)
Tandem Diabetes Care, Inc., a medical device company, designs, develops, and markets various products for people with insulin-dependent diabetes in the United States. The company is headquartered in San Diego, California.
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 634.62% per annum.
- TNDM price at the close of March 2, 2026 was $25.23 and was lower than the bottom border of the primary price channel by $2.50 (9.02%). This indicates a possible reversal in the primary trend direction.
- The secondary trend is decreasing.
- The decline rate of the secondary trend is 22.60% per annum.
- TNDM price at the close of March 2, 2026 was higher than the top border of the secondary price channel by $2.70 (11.99%). 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 TNDM 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: August 7, 2025
End date: January 9, 2026
a = -6.5114
b = 0.0055
s = 0.0685
Annual growth rate:
Exp(365 × b) – 1
= Exp(365 × 0.0055) – 1
= 634.62%
Price channel spread:
Exp(4 × s) – 1
= Exp(4 × 0.0685) – 1
= 31.51%
August 7, 2025 calculations
Top border of price channel:
Exp(Y1,113)
= Exp(a + b × X1,113 + 2 × s)
= Exp(a + b × 1,618 + 2 × s)
= Exp(-6.5114 + 0.0055 × 1,618 + 2 × 0.0685)
= Exp(2.4655)
= $11.77
Bottom border of price channel:
Exp(Y1,113)
= Exp(a + b × X1,113 – 2 × s)
= Exp(a + b × 1,618 – 2 × s)
= Exp(-6.5114 + 0.0055 × 1,618 – 2 × 0.0685)
= Exp(2.1916)
= $8.95
January 9, 2026 calculations
Top border of price channel:
Exp(Y1,220)
= Exp(a + b × X1,220 + 2 × s)
= Exp(a + b × 1,773 + 2 × s)
= Exp(-6.5114 + 0.0055 × 1,773 + 2 × 0.0685)
= Exp(3.3124)
= $27.45
Bottom border of price channel:
Exp(Y1,220)
= Exp(a + b × X1,220 – 2 × s)
= Exp(a + b × 1,773 – 2 × s)
= Exp(-6.5114 + 0.0055 × 1,773 – 2 × 0.0685)
= Exp(3.0385)
= $20.87
Description
- The primary trend is increasing.
- The growth rate of the primary trend is 634.62% per annum.
- TNDM price at the close of March 2, 2026 was $25.23 and was lower than the bottom border of the primary price channel by $2.50 (9.02%). This indicates a possible reversal in the primary trend direction.
Secondary Trend
Start date: November 14, 2025
End date: February 19, 2026
a = 4.2668
b = -0.0007
s = 0.0646
Annual growth rate:
Exp(365 × b) – 1
= Exp(365 × -0.0007) – 1
= -22.60%
Price channel spread:
Exp(4 × s) – 1
= Exp(4 × 0.0646) – 1
= 29.48%
November 14, 2025 calculations
Top border of price channel:
Exp(Y1,183)
= Exp(a + b × X1,183 + 2 × s)
= Exp(a + b × 1,717 + 2 × s)
= Exp(4.2668 + -0.0007 × 1,717 + 2 × 0.0646)
= Exp(3.1906)
= $24.30
Bottom border of price channel:
Exp(Y1,183)
= Exp(a + b × X1,183 – 2 × s)
= Exp(a + b × 1,717 – 2 × s)
= Exp(4.2668 + -0.0007 × 1,717 – 2 × 0.0646)
= Exp(2.9322)
= $18.77
February 19, 2026 calculations
Top border of price channel:
Exp(Y1,247)
= Exp(a + b × X1,247 + 2 × s)
= Exp(a + b × 1,814 + 2 × s)
= Exp(4.2668 + -0.0007 × 1,814 + 2 × 0.0646)
= Exp(3.1225)
= $22.70
Bottom border of price channel:
Exp(Y1,247)
= Exp(a + b × X1,247 – 2 × s)
= Exp(a + b × 1,814 – 2 × s)
= Exp(4.2668 + -0.0007 × 1,814 – 2 × 0.0646)
= Exp(2.8641)
= $17.53
Description
- The secondary trend is decreasing.
- The decline rate of the secondary trend is 22.60% per annum.
- TNDM price at the close of March 2, 2026 was higher than the top border of the secondary price channel by $2.70 (11.99%). This indicates a possible reversal in the secondary trend direction.