TransDigm Group INC (TDG) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-04-20 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: TransDigm Group INC (TDG) CIK: 0001260221 --- Reporting Owner --- Name: Howley W Nicholas CIK: 0001352573 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-04-20 | Code: M (Exercise of derivative) Shares: +9,789 | Price: $50.92 Total Value: $498,455.88 Shares Owned After: 31,336.513 | Ownership: I (Indirect) | Nature: W. Nicholas Howley Family Trust u/a/d 4/23/99 Footnotes: [F1] The exercise price has been adjusted for dividends declared since August 1, 2022. [Transaction #2] Security: Common Stock Date: 2026-04-20 | Code: M (Exercise of derivative) Shares: +343 | Price: $66.47 Total Value: $22,799.21 Shares Owned After: 31,679.513 | Ownership: I (Indirect) | Nature: W. Nicholas Howley Family Trust u/a/d 4/23/99 Footnotes: [F1] The exercise price has been adjusted for dividends declared since August 1, 2022. [Transaction #3] Security: Common Stock Date: 2026-04-20 | Code: S (Open market sale) Shares: -60 | Price: $1,260.34 Total Value: $75,620.31 Shares Owned After: 31,619.513 | Ownership: I (Indirect) | Nature: W. Nicholas Howley Family Trust u/a/d 4/23/99 Footnotes: [F2] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,260.0000 - $1,260.4800. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. [Transaction #4] Security: Common Stock Date: 2026-04-20 | Code: S (Open market sale) Shares: -1,035 | Price: $1,261.64 Total Value: $1,305,800.30 Shares Owned After: 30,584.513 | Ownership: I (Indirect) | Nature: W. Nicholas Howley Family Trust u/a/d 4/23/99 Footnotes: [F3] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,261.1800 - $1,262.1200. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. [Transaction #5] Security: Common Stock Date: 2026-04-20 | Code: S (Open market sale) Shares: -3,077 | Price: $1,262.66 Total Value: $3,885,191.59 Shares Owned After: 27,507.513 | Ownership: I (Indirect) | Nature: W. Nicholas Howley Family Trust u/a/d 4/23/99 Footnotes: [F4] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,262.2500 - $1,263.1700. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. [Transaction #6] Security: Common Stock Date: 2026-04-20 | Code: S (Open market sale) Shares: -589 | Price: $1,263.81 Total Value: $744,384.68 Shares Owned After: 26,918.513 | Ownership: I (Indirect) | Nature: W. Nicholas Howley Family Trust u/a/d 4/23/99 Footnotes: [F5] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,263.3700 - $1,264.1000. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. [Transaction #7] Security: Common Stock Date: 2026-04-20 | Code: S (Open market sale) Shares: -694 | Price: $1,264.95 Total Value: $877,874.81 Shares Owned After: 26,224.513 | Ownership: I (Indirect) | Nature: W. Nicholas Howley Family Trust u/a/d 4/23/99 Footnotes: [F6] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,264.5500 - $1,265.5300. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. [Transaction #8] Security: Common Stock Date: 2026-04-20 | Code: S (Open market sale) Shares: -1,304 | Price: $1,266.13 Total Value: $1,651,037.43 Shares Owned After: 24,920.513 | Ownership: I (Indirect) | Nature: W. Nicholas Howley Family Trust u/a/d 4/23/99 Footnotes: [F7] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,265.6650 - $1,266.6550. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. [Transaction #9] Security: Common Stock Date: 2026-04-20 | Code: S (Open market sale) Shares: -1,673 | Price: $1,267.14 Total Value: $2,119,920.03 Shares Owned After: 23,247.513 | Ownership: I (Indirect) | Nature: W. Nicholas Howley Family Trust u/a/d 4/23/99 Footnotes: [F8] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,266.7200 - $1,267.6800. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. [Transaction #10] Security: Common Stock Date: 2026-04-20 | Code: S (Open market sale) Shares: -940 | Price: $1,268.46 Total Value: $1,192,349.96 Shares Owned After: 22,307.513 | Ownership: I (Indirect) | Nature: W. Nicholas Howley Family Trust u/a/d 4/23/99 Footnotes: [F9] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,267.7700 - $1,268.7600. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. [Transaction #11] Security: Common Stock Date: 2026-04-20 | Code: S (Open market sale) Shares: -270 | Price: $1,269.62 Total Value: $342,797.51 Shares Owned After: 22,037.513 | Ownership: I (Indirect) | Nature: W. Nicholas Howley Family Trust u/a/d 4/23/99 Footnotes: [F10] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,268.9300 - $1,269.8800. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. [Transaction #12] Security: Common Stock Date: 2026-04-20 | Code: S (Open market sale) Shares: -430 | Price: $1,270.46 Total Value: $546,297.20 Shares Owned After: 21,607.513 | Ownership: I (Indirect) | Nature: W. Nicholas Howley Family Trust u/a/d 4/23/99 Footnotes: [F11] Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,270.4000 - $1,270.4900. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. [Transaction #13] Security: Common Stock Date: 2026-04-20 | Code: S (Open market sale) Shares: -60 | Price: $1,271.63 Total Value: $76,297.80 Shares Owned After: 21,547.513 | Ownership: I (Indirect) | Nature: W. Nicholas Howley Family Trust u/a/d 4/23/99 --- Derivative Transactions --- [Transaction #1] Security: Stock Option Date: 2026-04-20 | Code: M (Exercise of derivative) Shares: -9,789 | Price: $0.00 Exercisable: N/A | Expires: 2026-11-10 Shares Owned After: 0 | Ownership: I (Indirect) | Nature: W. Nicholas Howley Family Trust u/a/d 4/23/99 Footnotes: [F1] The exercise price has been adjusted for dividends declared since August 1, 2022. [Transaction #2] Security: Stock Option Date: 2026-04-20 | Code: M (Exercise of derivative) Shares: -343 | Price: $0.00 Exercisable: N/A | Expires: 2027-11-08 Shares Owned After: 42,228 | Ownership: I (Indirect) | Nature: W. Nicholas Howley Family Trust u/a/d 4/23/99 Footnotes: [F1] The exercise price has been adjusted for dividends declared since August 1, 2022. --- Footnotes (Complete Index) --- F1: The exercise price has been adjusted for dividends declared since August 1, 2022. F10: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,268.9300 - $1,269.8800. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. F11: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,270.4000 - $1,270.4900. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. F2: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,260.0000 - $1,260.4800. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. F3: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,261.1800 - $1,262.1200. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. F4: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,262.2500 - $1,263.1700. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. F5: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,263.3700 - $1,264.1000. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. F6: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,264.5500 - $1,265.5300. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. F7: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,265.6650 - $1,266.6550. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. F8: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,266.7200 - $1,267.6800. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. F9: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,267.7700 - $1,268.7600. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. --- Signature --- /s/ /s/ Rachel L. Quinlan as attorney in fact for W. Nicholas Howley (2026-04-21)