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Stock-based Compensation | 12 Months Ended
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Sep. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Stock-based Compensation | 3. STOCK-BASED COMPENSATION The Spire 2015 Equity Incentive Plan (EIP) was approved by shareholders of Spire on January 29, 2015 and amended on November 9, 2018. The 2015 EIP was replaced by the 2025 Equity Incentive Plan (EIP), which was approved by shareholders on January 30, 2025. The purpose of the EIP is to encourage directors, officers, and key employees of the Company and its subsidiaries to contribute to the Company’s success and align their interests with that of shareholders. To accomplish this purpose, the Compensation and Human Resources Committee (“Committee”) of Spire’s Board of Directors (the “Board”) may grant awards under the EIP that may be earned by achieving performance objectives and/or other criteria as determined by the Committee. Under the terms of the EIP, officers and employees of the Company and its subsidiaries, as determined by the Committee, are eligible to be selected for awards. The EIP provides for restricted stock, restricted stock units, qualified and non-qualified stock options, stock appreciation rights, and performance shares payable in stock, cash, or a combination of both. The EIP generally provides a minimum vesting period of at least three years for each type of award, with pro rata vesting permitted during the minimum three-year vesting period. The maximum number of shares reserved for issuance under the EIP is 1,500,000. The Company allows participants in the EIP the ability to defer a portion or all of their award. As of September 30, 2025, a total of 79,815 share equivalents (at target payout) have been deferred by participants. Such units are included in the data presented below. After the required holding period, deferred awards are ultimately paid in cash rather than in shares of stock. Upon vesting, the Company issues new shares to satisfy awards that are not deferred. Effective with the fiscal 2026 grants, deferral of awards will no longer be an option available to grantees. Restricted Stock Awards During fiscal 2025, the Company granted 103,780 performance-contingent restricted share units to executive officers and key employees at a weighted average grant date fair value of $76.52 per share. This number represents the target shares that can be earned pursuant to the terms of the awards. The share units have a performance period ending September 30, 2027. While the participants have no interim voting rights on these share units, dividends accrue during the performance period and are paid to the participants upon vesting but are subject to forfeiture if the underlying share units do not vest. The number of share units that will ultimately vest is dependent upon the attainment of certain levels of earnings, as well as the Company’s level of total shareholder return (TSR) during the performance period relative to a comparator group of peer companies. This TSR provision is considered a market condition under GAAP and is discussed further below. The maximum amount of shares or share equivalents that can be earned pursuant to the terms of the awards is 200% of the target units granted. The weighted average grant date fair value of performance-contingent restricted share units granted during fiscal years 2024 and 2023 was $74.23 and $79.88 per share, respectively. Fiscal 2025 activity of restricted stock units subject to performance and/or market conditions is presented below:
|  | Units |  |  | Weighted Average Grant Date Fair Value Per Unit |
Non-vested at September 30, 2024 |  |  | 289,205 |  |  | $ | 73.36 |
Granted |  |  | 103,780 |  |  | $ | 76.52 |
Adjusted for performance |  |  | 21,469 |  |  | $ | 65.02 |
Vested |  |  | (100,784 | ) |  | $ | 65.02 |
Forfeited |  |  | (69,166 | ) |  | $ | 74.67 |
Non-vested at September 30, 2025 |  |  | 244,504 |  |  | $ | 75.62 |
For the year ended September 30, 2025, the total number of shares or share equivalents that could be issued if all outstanding award grants attain maximum performance payout is 564,862. During fiscal 2025, the Company granted 57,030 shares of time-vested restricted stock to executive officers and key employees at a weighted average grant date fair value of $72.00 per share. Unless forfeited based on terms of the agreements, these shares will vest in fiscal 2028. In the interim, participants receive full voting rights and dividends, which are not subject to forfeiture. The weighted average grant date fair value of time-vested restricted stock and restricted stock units awarded to employees during fiscal years 2024 and 2023 was $60.68 and $71.91 per share, respectively. During fiscal 2025, the Company granted 15,750 shares of time-vested restricted stock to non-employee directors at a weighted average grant date fair value of $71.38 per share. These shares vested in fiscal 2025, six months after the grant date. The weighted average grant date fair value of restricted stock awarded to non-employee directors during fiscal years 2024 and 2023 was $58.03 and $75.59 per share, respectively. Time-vested restricted stock and stock unit activity for fiscal 2025 is presented below:
|  | Shares/ Units |  |  | Weighted Average Grant Date Fair Value Per Share |
Non-vested at September 30, 2024 |  |  | 85,559 |  |  | $ | 64.13 |
Granted |  |  | 57,030 |  |  | $ | 72.00 |
Vested |  |  | (42,677 | ) |  | $ | 66.36 |
Forfeited |  |  | (23,348 | ) |  | $ | 67.61 |
Non-vested at September 30, 2025 |  |  | 76,564 |  |  | $ | 67.20 |
For restricted stock and stock units (performance-contingent and time-vested) that vested during fiscal years 2025, 2024, and 2023, the Company withheld 26,892 shares, 24,724 shares, and 18,428 shares, respectively, at weighted average prices of $73.45, $60.73 and $72.03 per share, respectively, pursuant to elections by employees to satisfy tax withholding obligations. The total fair value of restricted stock (performance-contingent and time-vested) that vested during fiscal years 2025, 2024, and 2023 was $8.0, $11.9, and $8.6, respectively, and the related tax benefit was $4.0, $3.7, and $3.2, respectively. None of the tax benefits have been realized. Equity Compensation Costs Compensation cost for performance-contingent restricted stock and stock unit awards is based upon the probable outcome of the performance conditions. For shares or units that do not vest or that are not expected to vest due to the outcome of the performance conditions (excluding market conditions), no compensation cost is recognized and any previously recognized compensation cost is reversed. The fair value of awards of performance-contingent and time-vested restricted stock and restricted stock units, not subject to the TSR provision, are estimated using the closing price of the Company’s stock on the grant date. For those awards that do not pay dividends during the vesting period, the estimate of fair value is reduced by the present value of the dividends expected to be paid on the Company’s common stock during the performance period, discounted using an appropriate U.S. Treasury yield. For shares subject to the TSR provision, the estimated impact of this market condition is reflected in the grant date fair value per share of the awards. Accordingly, compensation cost is not reversed to reflect any actual reductions in the awards that may result from the TSR provision. The grant date fair value of the awards subject to the TSR provision awarded during fiscal years 2024, 2023 and 2022 was valued by a Monte Carlo simulation model that assessed the probabilities of various TSR outcomes. The significant assumptions used in the Monte Carlo simulations are as follows:
|  | 2025 |  | 2024 |  | 2023
Risk-free interest rate |  | 4.33% |  | 4.66% |  | 4.26%
Expected dividend yield of stock |  | — |  | — |  | —
Expected volatility of stock |  | 22.2% |  | 23.3% |  | 33.8%
Performance period (in years) |  | 3.0 |  | 3.0 |  | 3.0
The risk-free interest rate was based on the yield on U.S. Treasury securities matching the vesting period. A zero-percent dividend yield was used, which is mathematically equivalent to the assumption that dividends are reinvested as they are paid. The expected volatility is based on the historical volatility of the Company’s stock. Volatility assumptions were also made for each of the companies included in the comparator group. The vesting period is equal to the performance period set forth in the terms of the award. The amounts of compensation cost recognized for share-based compensation arrangements are presented below:
|  | 2025 |  |  | 2024 |  |  | 2023 |
Total compensation cost |  | $ | 7.8 |  |  | $ | 6.6 |  |  | $ | 11.2 |
Compensation cost capitalized |  |  | (1.1 | ) |  |  | (0.8 | ) |  |  | (1.4 | )
Compensation cost recognized in net income |  |  | 6.7 |  |  |  | 5.8 |  |  |  | 9.8 |
Income tax benefit recognized in net income |  |  | (1.5 | ) |  |  | (1.3 | ) |  |  | (2.2 | )
Compensation cost recognized in net income, net of income tax |  | $ | 5.2 |  |  | $ | 4.5 |  |  | $ | 7.6 |
As of September 30, 2025, there was $8.7 of total unrecognized compensation cost related to non-vested share-based compensation arrangements, which is expected to be recognized over a weighted average period of 1.8 years.

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