UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): October 23, 2013

TransDigm Group Incorporated

(Exact name of registrant as specified in its charter)

Delaware

(State or other jurisdiction of incorporation)

001-32833

(Commission File Number)

41-2101738

(IRS Employer Identification No.)

(216) 706-2960

(Registrant’s telephone number, including area code)

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Employment Agreement with Jorge Valladares and Amendment to Option Awards

On October 28, 2013, the Company entered into an employment agreement with Jorge L. Valladares III pursuant to which Mr. Valladares will serve as an executive vice president of the Company. The employment agreement is substantially in the same form as those of the Company’s other executive officers. Unless earlier terminated by the Company or Mr. Valladares, the term of the employment agreement expires on October 1, 2018. Under the terms of the employment agreement, Mr. Valladares is entitled to receive an annual base salary of not less than $350,000 and is eligible to participate in the Company’s annual bonus plan with a bonus target set at 65% of his annual base salary. In addition, under the terms of the employment agreement, Mr. Valladares is entitled to participate in employee benefit plans, programs and arrangements that the Company may maintain from time to time for its senior officers.

The employment agreement provides that if Mr. Valladares is terminated for any reason, he will be entitled to payment of any accrued but unpaid base salary through the termination date, any unreimbursed expenses, an amount for accrued but unused sick and vacation days, and benefits owing to him under the benefit plans and programs sponsored by the Company. In addition, if Mr. Valladares’ employment is terminated without cause, if he terminates his employment for certain enumerated good reasons, or if his employment terminates due to his death or disability, the Company will pay him, in substantially equal installments over a 12-month period, an amount equal to one times his salary plus one times the greater of the all of the bonuses paid or payable to him for the prior fiscal year (excluding any extraordinary bonus) or the target bonuses for the year in which his employment terminates, determined in accordance with the Company’s bonus program(s) if any.

During the term of employment and following any termination thereof, for a period of 24 months, Mr. Valladares will be prohibited from engaging in any business that competes with any business of the Company or its subsidiaries. In addition, during the term of his employment and for the two-year period following the termination of his employment for any reason, he will be prohibited from soliciting or inducing any person who is or was employed by, or providing consulting services to, the Company or any of its subsidiaries during the 12-month period prior to the date of the termination of his employment, to terminate their employment or consulting relationship with the Company or such subsidiary. Under the terms of his employment agreement, Mr. Valladares is also subject to certain confidentiality and non-disclosure obligations, and the Company has agreed, so long as the applicable executive is not in breach of certain of his obligations under his employment agreement, to, among other things, indemnify him to the fullest extent permitted by Delaware law against all costs, charges and expenses incurred or sustained by him in connection with any action, suit or proceeding to which he may be made a party by reason of his being or having been a director, officer or employee of ours or his serving or having served any other enterprise as a director, officer or employee at our request.

The foregoing descriptions of the terms of the employment agreement is qualified in its entirety by the full text of the employment agreement, a copy of which is filed herewith as Exhibit 10.1.

In addition, consistent with amendments made to option awards of the Company’s other executive officers, on October 23, 2013, the Compensation Committee (the “Committee”) of the Company’s Board of Directors approved an amendment to all of Mr. Valladares’s outstanding option award agreements to extend the period of exercisability of options post-termination to the remainder of the term of the option in the event of termination for death, disability, without cause or for good reason (as defined in the employment agreement) (previously one year for death or disability and six months for termination for good reason or without cause). As previously disclosed, the amendments to extend the period of exercisability of options for executive officers are made light of the significant option holdings of the executive officers and the Company’s significant stock ownership requirements.

The foregoing description of the terms of the amendments is qualified in its entirety by the full text of the amendments, a copy of which is filed herewith as Exhibit 10.2.

On October 24, 2013, the Board of Directors of TransDigm Group Incorporated authorized an increase from $100 million to $200 million to the common stock repurchase program approved in August 2011. The repurchase program authorizes the Company to repurchase up to $200 million of the Company’s common stock. The Company has repurchased approximately $850,000 since the plan was announced in August 2011. The stock repurchase program may be carried out at the direction of the Company through open market purchases (which may or may not include one or more plans under Rule 10b5-1 of the Securities Exchange Act of 1934), block trades, and Board-approved privately negotiated transactions. Any repurchased shares will be held in treasury and will be available for general corporate purposes.

(d) Exhibits

The following exhibit is being filed with this Current Report on Form 8-K:

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: October 29, 2013

Exhibit Index