Three Months Ended
June 30,

Nine Months Ended
 June 30,

2026

2025

2026

2025

Spire

Service cost – benefits earned during the period

$

4.2

$

4.4

$

12.8

$

13.2

Interest cost on projected benefit obligation

6.0

5.8

18.3

17.6

Expected return on plan assets

(6.9

)

(6.4

)

(20.6

)

(19.3

)

Amortization of prior service credit

(0.9

)

(1.2

)

(3.2

)

(3.5

)

Amortization of actuarial loss

1.4

1.6

4.3

4.8

Subtotal

3.8

4.2

11.6

12.8

Regulatory adjustment

3.8

9.2

16.2

27.3

Net pension cost

$

7.6

$

13.4

$

27.8

$

40.1

Spire Missouri

Service cost – benefits earned during the period

$

2.9

$

2.9

$

8.7

$

8.6

Interest cost on projected benefit obligation

4.1

3.9

12.4

11.9

Expected return on plan assets

(4.4

)

(4.4

)

(13.2

)

(13.2

)

Amortization of prior service credit

(0.3

)

(0.5

)

(1.3

)

(1.5

)

Amortization of actuarial loss

0.9

1.0

2.8

3.0

Subtotal

3.2

2.9

9.4

8.8

Regulatory adjustment

2.8

7.4

14.1

22.2

Net pension cost

$

6.0

$

10.3

$

23.5

$

31.0

Spire Alabama

Service cost – benefits earned during the period

$

1.2

$

1.4

$

3.6

$

4.1

Interest cost on projected benefit obligation

1.3

1.3

3.9

3.8

Expected return on plan assets

(1.6

)

(1.3

)

(4.8

)

(3.9

)

Amortization of prior service credit

(0.6

)

(0.7

)

(1.8

)

(1.9

)

Amortization of actuarial loss

0.5

0.6

1.5

1.8

Subtotal

0.8

1.3

2.4

3.9

Regulatory adjustment

0.5

1.5

1.4

4.4

Net pension cost

$

1.3

$

2.8

$

3.8

$

8.3

Three Months Ended
June 30,

Nine Months Ended
 June 30,

2026

2025

2026

2025

Spire

Service cost – benefits earned during the period

$

1.0

$

1.1

$

2.9

$

3.2

Interest cost on accumulated postretirement benefit obligation

1.7

1.7

5.2

5.3

Expected return on plan assets

(4.6

)

(4.1

)

(13.5

)

(12.5

)

Amortization of prior service cost

0.3

0.1

0.6

0.1

Amortization of actuarial gain

(1.9

)

(1.5

)

(5.7

)

(4.5

)

Subtotal

(3.5

)

(2.7

)

(10.5

)

(8.4

)

Regulatory adjustment

2.0

1.1

6.0

3.4

Net postretirement benefit income

$

(1.5

)

$

(1.6

)

$

(4.5

)

$

(5.0

)

Spire Missouri

Service cost – benefits earned during the period

$

0.8

$

0.9

$

2.3

$

2.6

Interest cost on accumulated postretirement benefit obligation

1.2

1.2

3.7

3.8

Expected return on plan assets

(3.0

)

(2.7

)

(8.9

)

(8.2

)

Amortization of prior service cost

0.2

0.1

0.5

0.2

Amortization of actuarial gain

(1.6

)

(1.3

)

(5.0

)

(3.9

)

Subtotal

(2.4

)

(1.8

)

(7.4

)

(5.5

)

Regulatory adjustment

2.4

1.5

7.3

4.7

Net postretirement benefit income

$

—

$

(0.3

)

$

(0.1

)

$

(0.8

)

Spire Alabama

Service cost – benefits earned during the period

$

0.2

$

0.2

$

0.6

$

0.6

Interest cost on accumulated postretirement benefit obligation

0.5

0.4

1.5

1.4

Expected return on plan assets

(1.4

)

(1.3

)

(4.2

)

(4.0

)

Amortization of prior service credit

0.1

—

0.1

(0.1

)

Amortization of actuarial gain

(0.1

)

—

(0.2

)

(0.1

)

Subtotal

(0.7

)

(0.7

)

(2.2

)

(2.2

)

Regulatory adjustment

(0.5

)

(0.5

)

(1.4

)

(1.4

)

Net postretirement benefit income

$

(1.2

)

$

(1.2

)

$

(3.6

)

$

(3.6

)