ALLIANT ENERGY CORP
For the period ended Sep 30, 2026. Filed Oct 30, 2026.
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A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.
Sep 30, 2026 · Filed Oct 30, 2026
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. Benefit Plans
NOTE 9. BENEFIT PLANS
NOTE 9(a) Pension and OPEB Plans -
Net Periodic Benefit Costs -The components of net periodic benefit costs for sponsored defined benefit pension and OPEB plans for the three and nine months ended September 30 are included below (in millions). For IPL and WPL, amounts are for their plan participants covered under plans they sponsor, as well as amounts directly assigned to them related to certain participants in the Alliant Energy and Corporate Services sponsored plans.
| Defined Benefit Pension Plans · OPEB Plans | ||||||||
|---|---|---|---|---|---|---|---|---|
| Three Months | Nine Months | Three Months | Nine Months | |||||
| Alliant Energy | 2026 | 2025 | 2026 | 2025 | 2026 | 2025 | 2026 | 2025 |
| Service cost | $1 | $1 | $3 | $3 | $1 | $— | $1 | $1 |
| Interest cost | 11 | 11 | 33 | 34 | 2 | 2 | 6 | 6 |
| Expected return on plan assets | (13) | (13) | (41) | (40) | (2) | — | (4) | (3) |
| Amortization of prior service credit | (1) | (1) | (1) | (1) | — | — | — | — |
| Amortization of actuarial loss | 4 | 6 | 13 | 17 | — | — | — | — |
| $2 | $4 | $7 | $13 | $1 | $2 | $3 | $4 | |
| Defined Benefit Pension Plans · OPEB Plans | ||||||||
|---|---|---|---|---|---|---|---|---|
| Three Months | Nine Months | Three Months | Nine Months | |||||
| IPL | 2026 | 2025 | 2026 | 2025 | 2026 | 2025 | 2026 | 2025 |
| Service cost | $1 | $1 | $2 | $2 | $— | $— | $— | $— |
| Interest cost | 4 | 5 | 14 | 15 | — | — | 2 | 2 |
| Expected return on plan assets | (7) | (7) | (19) | (19) | — | (1) | (2) | (3) |
| Amortization of actuarial loss | 2 | 3 | 5 | 7 | — | — | — | — |
| $— | $2 | $2 | $5 | $— | ($1) | $— | ($1) | |
| Defined Benefit Pension Plans · OPEB Plans | ||||||||
|---|---|---|---|---|---|---|---|---|
| Three Months | Nine Months | Three Months | Nine Months | |||||
| WPL | 2026 | 2025 | 2026 | 2025 | 2026 | 2025 | 2026 | 2025 |
| Service cost | $1 | $— | $1 | $1 | $— | $— | $— | $— |
| Interest cost | 4 | 5 | 14 | 15 | 1 | 1 | 2 | 2 |
| Expected return on plan assets | (6) | (5) | (18) | (17) | — | (1) | — | (1) |
| Amortization of actuarial loss | 2 | 3 | 6 | 8 | — | — | — | — |
| $1 | $3 | $3 | $7 | $1 | $— | $2 | $1 | |
NOTE 9(b) Equity-based Compensation Plans -A summary of compensation expense, including amounts allocated to IPL and WPL, and the related income tax benefits recognized for share-based compensation awards for the three and nine months ended September 30 was as follows (in millions):
| Alliant Energy · IPL · WPL | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Three Months | Nine Months | Three Months | Nine Months | Three Months | Nine Months | |||||||
| 2026 | 2025 | 2026 | 2025 | 2026 | 2025 | 2026 | 2025 | 2026 | 2025 | 2026 | 2025 | |
| Compensation expense | $13 | $6 | $29 | $13 | $7 | $3 | $15 | $7 | $6 | $2 | $14 | $6 |
| Income tax benefits | 5 | 2 | 6 | 4 | 3 | 1 | 3 | 2 | 2 | 1 | 3 | 2 |
As of September 30, 2026, Alliant Energy’s, IPL’s and WPL’s total unrecognized compensation cost related to share-based compensation awards was $22 million, $11 million and $10 million, respectively, which is expected to be recognized over a weighted average period of between 1 year and 2 years.
For the nine months ended September 30, 2026, performance shares and restricted stock units were granted to key employees under the equity-based compensation plans as follows. These shares and units will be settled in shares of common stock, and are therefore accounted for as equity awards.
| Weighted Average | ||
|---|---|---|
| Grants | Grant Date Fair Value | |
| Performance shares (total shareowner return metric) | 119,279 | $75.27 |
| Performance shares (net income metric) | 119,279 | 70.09 |
| Restricted stock units | 100,594 | 70.26 |
For the three and nine months ended September 30, 2026,553,011 and 548,134 shares, respectively, were included in the calculation of diluted EPS related to the nonvested equity awards.
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