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STOCK-BASED COMPENSATION
 12 Months Ended
Sep. 30, 2025
Share-Based Payment Arrangement [Abstract]  
STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION
The Company’s equity compensation plans are designed to assist the Company in attracting, retaining, motivating and rewarding key employees, directors or consultants, and promoting the creation of long-term value for stockholders by closely aligning the interests of these individuals with those of the Company’s stockholders. The Company’s equity compensation plans provide for the granting of stock options.
Non-cash stock compensation expense recognized by the Company during the fiscal years ended September 30, 2025, 2024 and 2023 was $152 million, $188 million and $135 million, respectively. The related tax benefit for the fiscal years ended September 30, 2025, 2024 and 2023 was $24 million, $24 million and $15 million, respectively. Of the non-cash stock compensation expense recorded in fiscal 2025, 2024 and 2023, $150 million, $134 million and $112 million was recorded as a component of additional paid in capital and less than $2 million, $54 million and $23 million was recorded as a component of other non-current liabilities. The liability awards relate to stock options granted between fiscal 2017 to fiscal 2020 from the 2014 stock option plan to certain employees in lieu of these individuals receiving salary and bonus compensation paid in cash. The vesting of the stock options are subject to the achievement of the same operating performance goals as other grants. The liability is remeasured each reporting period based on the market value of our common shares on the last day of the reported period. The other non-current liabilities related to stock-based compensation was $102 million as of September 30, 2025 and 2024.
The weighted-average grant date fair value of options granted during the fiscal years ended September 30, 2025, 2024 and 2023 was $549.03, $397.31 and $251.73, respectively. The total fair value of options vested during fiscal years ended September 30, 2025, 2024 and 2023 was $107 million, $97 million and $80 million, respectively.
Compensation expense is recognized based upon probability assessments of awards that are expected to vest in future periods, adjusted for expected forfeitures. Such probability assessments are subject to revision and, therefore, unrecognized compensation expense is subject to future changes in estimate. As of September 30, 2025, there was approximately $208 million of total unrecognized compensation expense related to non-vested awards expected to vest, which is expected to be recognized over a weighted-average period of 1.8 years.
The fair value of the Company’s employee stock options was estimated at the date of grant or modification using a Black-Scholes option-pricing model with the following weighted average assumptions for all options granted during the fiscal years ended:
 Fiscal Years Ended September 30,
 202520242023
Risk-free interest rate
4.0% to 4.5%
4.1% to 4.7%
3.5% to 4.2%
Expected life of options
6.5 years
6.5 years
6.5 years
Expected dividend yield of stock
—
—
—
Expected volatility of stock
32.5%
33.5%
32.5%
The risk-free interest rate is based upon the U.S. Treasury bond rates with a term similar to the expected life of the award as of the grant date or modification date. The average expected life of stock-based awards is based on the Company’s actual historical exercise experience. The Company uses actual historical changes in the market value of its stock to calculate the volatility assumption as it is management’s belief that this is the best indicator of future volatility. The Company estimates stock option forfeitures based on historical data. The total number of stock options expected to vest is adjusted by actual and estimated forfeitures. Changes to the actual and estimated forfeitures will result in a cumulative adjustment in the period of change. Notwithstanding the special cash dividends declared and paid from time to time, the Company historically has not declared and paid regular cash dividends and does not anticipate declaring and paying regular cash dividends in future periods. Furthermore, since vested options under the Company’s equity compensation plans are entitled to participate in dividend equivalents (refer to “Dividends and Dividend Equivalent Plans” section below) upon declaration of a special dividend, no expected dividend yield is assumed.
2019 Stock Option Plan
In August 2019, the Board of Directors of TD Group adopted a new stock option plan, which was subsequently approved by stockholders on October 3, 2019. The 2019 stock option plan permits TD Group to award stock options to our key employees, directors or consultants. The total number shares of TD Group common stock reserved for issuance or delivery under the 2019 stock option plan is 4,000,000, subject to adjustment in the event of any stock dividend or split, reorganization, recapitalization, merger, share exchange or any other similar corporate transaction or event.
Performance Vested Stock Options – Generally all of the options granted through September 30, 2025 under the 2019 stock option plan have been pursuant to an equity incentive program adopted by the Company in 2008. Under the 2008 equity incentive program, generally all of the options granted will vest based on the Company’s achievement of established operating performance goals. The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2025:
Number of
Options		Weighted-Average
Exercise Price Per
Option		Weighted-Average
Remaining
Contractual  Term		Aggregate
Intrinsic Value
Outstanding at September 30, 2024561,109 $795.95 
Granted346,664 1,316.43 
Exercised(26,420)656.47 
Forfeited(121,745)909.08 
Expired— — 
Outstanding at September 30, 2025759,608 $1,020.20 
8.4 years
$226,226,455 
Expected to vest409,971 $1,051.67 
8.5 years
$109,195,776 
Exercisable at September 30, 202593,696 $724.47 
7.6 years
$55,613,261 
At September 30, 2025, there were 3,210,451 remaining shares available for award under TD Group’s 2019 stock option plan.
2014 Stock Option Plan
In July 2014, the Board of Directors of TD Group adopted the 2014 stock option plan, which was subsequently approved by stockholders on October 2, 2014. The 2014 stock option plan permitted TD Group to award stock options to our key employees, directors or consultants. The total number of shares of TD Group common stock reserved for issuance or delivery under the 2014 stock option plan was 5,000,000, subject to adjustment in the event of any stock dividend or split, reorganization, recapitalization, merger, share exchange or any other similar corporate transaction or event. The 2014 stock option plan expired on July 24, 2024 and no further shares are granted under the plan thereafter.
Performance Vested Stock Options – Generally all of the options granted through September 30, 2025 under the 2014 stock option plan have been pursuant to an equity incentive program adopted by the Company in 2008. Under the 2008 equity incentive program, generally all of the options granted will vest based on the Company’s achievement of established operating performance goals. The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2025:
Number of
Options		Weighted-Average
Exercise Price Per
Option		Weighted-Average
Remaining
Contractual  Term		Aggregate
Intrinsic Value
Outstanding at September 30, 20243,779,503 $466.18 
Granted— — 
Exercised(462,368)288.80 
Forfeited(86,209)620.43 
Expired— — 
Outstanding at September 30, 20253,230,926 $487.45 
4.4 years
$2,683,510,208 
Expected to vest478,730 $670.73 
7.1 years
$309,877,142 
Exercisable at September 30, 20252,429,832 $376.64 
3.6 years
$2,287,395,248 
2006 Stock Incentive Plan
In conjunction with the consummation of the Company’s initial public offering, a 2006 stock incentive plan was adopted by TD Group. In July 2008 and March 2011, the 2006 stock incentive plan was amended to increase the number of shares available for issuance thereunder. TD Group reserved 8,119,668 shares of its common stock for issuance to key employees, directors or consultants under the plan. The 2006 stock incentive plan expired on March 14, 2016 and no further shares are granted under the plan thereafter. At September 30, 2025, there were 1,450 options outstanding and exercisable under TD Group’s 2006 stock incentive plan.
The total intrinsic value of performance options exercised during the fiscal years ended September 30, 2025, 2024 and 2023 was $600 million, $794 million and $500 million, respectively.
Dividends and Dividend Equivalent Plans
Since August 5, 2022, pursuant to the Fourth Amended and Restated TransDigm Group Incorporated 2006 Stock Incentive Plan Dividend Equivalent Plan, the Amended and Restated 2014 Stock Option Plan Dividend Equivalent Plan and the 2019 Stock Option Plan Dividend Equivalent Plan, all of the vested options granted under the existing stock option plans, except for grants to the members of the Board of Directors, are entitled to certain dividend equivalent payments in the event of the declaration of a special dividend by the Company.
In fiscal 2025, the Company's Board of Directors authorized and declared $90.00 in special dividends on each outstanding share of common stock and cash dividend equivalent payments on eligible vested options outstanding under its stock option plans. The total cash payment in September 2025 was approximately $5,073 million in special dividends and $159 million in cash dividend equivalent payments.
Dividend equivalents on vested options were $208 million, $233 million and $38 million during the fiscal years ended September 30, 2025, 2024 and 2023, respectively. At September 30, 2025, there was $59 million recorded in accrued and other current liabilities and $76 million recorded in other non-current liabilities on the consolidated balance sheets related to future dividend equivalent payments.