TransDigm Group INC — Director's Dealing 2012

May 11, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TransDigm Group INC (TDG)
CIK: 0001260221
Period of Report: 2012-05-10

Reporting Person: Maroney Sean P (Treasurer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-05-10	Common Stock	M	2500	$13.37	Acquired	2700	Direct
2012-05-10	Common Stock	S	701	$125.6891	Disposed	1999	Direct
2012-05-10	Common Stock	S	1699	$126.2608	Disposed	300	Direct
2012-05-10	Common Stock	S	100	$127.31	Disposed	200	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-05-10	Stock Option	$13.37	M	2500	Disposed	2015-10-01	Common Stock (2500)	Direct

Footnotes

F1: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $125.14 - $126.05. 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 $126.18 - $127.15. 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.