Three Months Ended
March 31,

Six Months Ended
 March 31,

2026

2025

2026

2025

Spire

Service cost – benefits earned during the period

$

4.3

$

4.3

$

8.6

$

8.8

Interest cost on projected benefit obligation

6.2

5.8

12.3

11.8

Expected return on plan assets

(6.8

)

(6.4

)

(13.7

)

(12.9

)

Amortization of prior service credit

(1.3

)

(1.2

)

(2.3

)

(2.3

)

Amortization of actuarial loss

1.5

1.6

2.9

3.2

Subtotal

3.9

4.1

7.8

8.6

Regulatory adjustment

6.6

9.2

12.4

18.1

Net pension cost

$

10.5

$

13.3

$

20.2

$

26.7

Spire Missouri

Service cost – benefits earned during the period

$

2.9

$

2.8

$

5.8

$

5.7

Interest cost on projected benefit obligation

4.2

4.0

8.3

8.0

Expected return on plan assets

(4.4

)

(4.3

)

(8.8

)

(8.8

)

Amortization of prior service credit

(0.6

)

(0.5

)

(1.0

)

(1.0

)

Amortization of actuarial loss

1.0

1.0

1.9

2.0

Subtotal

3.1

3.0

6.2

5.9

Regulatory adjustment

6.2

7.4

11.3

14.8

Net pension cost

$

9.3

$

10.4

$

17.5

$

20.7

Spire Alabama

Service cost – benefits earned during the period

$

1.2

$

1.3

$

2.4

$

2.7

Interest cost on projected benefit obligation

1.3

1.2

2.6

2.5

Expected return on plan assets

(1.6

)

(1.3

)

(3.2

)

(2.6

)

Amortization of prior service credit

(0.6

)

(0.6

)

(1.2

)

(1.2

)

Amortization of actuarial loss

0.5

0.6

1.0

1.2

Subtotal

0.8

1.2

1.6

2.6

Regulatory adjustment

0.4

1.6

0.9

2.9

Net pension cost

$

1.2

$

2.8

$

2.5

$

5.5

Three Months Ended
March 31,

Six Months Ended
 March 31,

2026

2025

2026

2025

Spire

Service cost – benefits earned during the period

$

0.9

$

1.0

$

1.9

$

2.1

Interest cost on accumulated postretirement benefit obligation

1.8

1.8

3.5

3.6

Expected return on plan assets

(4.4

)

(4.2

)

(8.9

)

(8.4

)

Amortization of prior service cost

0.1

—

0.3

—

Amortization of actuarial gain

(1.8

)

(1.5

)

(3.8

)

(3.0

)

Subtotal

(3.4

)

(2.9

)

(7.0

)

(5.7

)

Regulatory adjustment

2.1

1.2

4.0

2.3

Net postretirement benefit income

$

(1.3

)

$

(1.7

)

$

(3.0

)

$

(3.4

)

Spire Missouri

Service cost – benefits earned during the period

$

0.7

$

0.8

$

1.5

$

1.7

Interest cost on accumulated postretirement benefit obligation

1.3

1.3

2.5

2.6

Expected return on plan assets

(2.9

)

(2.7

)

(5.9

)

(5.5

)

Amortization of prior service cost

0.1

—

0.3

0.1

Amortization of actuarial gain

(1.7

)

(1.3

)

(3.4

)

(2.6

)

Subtotal

(2.5

)

(1.9

)

(5.0

)

(3.7

)

Regulatory adjustment

2.5

1.6

4.9

3.2

Net postretirement benefit income

$

—

$

(0.3

)

$

(0.1

)

$

(0.5

)

Spire Alabama

Service cost – benefits earned during the period

$

0.2

$

0.2

$

0.4

$

0.4

Interest cost on accumulated postretirement benefit obligation

0.5

0.5

1.0

1.0

Expected return on plan assets

(1.4

)

(1.4

)

(2.8

)

(2.7

)

Amortization of prior service credit

—

—

—

(0.1

)

Amortization of actuarial gain

—

(0.1

)

(0.1

)

(0.1

)

Subtotal

(0.7

)

(0.8

)

(1.5

)

(1.5

)

Regulatory adjustment

(0.4

)

(0.4

)

(0.9

)

(0.9

)

Net postretirement benefit income

$

(1.1

)

$

(1.2

)

$

(2.4

)

$

(2.4

)