TDG Transdigm Group Incorporated

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Explanatory Note: This Amendment No. 7/A is an amendment to the Schedule 13D, Amendment number 7, dated August 29, 2019, and is being filed jointly by the following (each, a "Reporting Person" and, collectively, the "Reporting Persons"): Berkshire Partners Holdings LLC (“BPH”), BPSP, L.P. (“BPSP”), Berkshire Partners LLC (“BP”), Stockbridge Partners LLC (“SP”), Berkshire Fund VIII, L.P. (“Fund VIII”), Berkshire Fund VIII-A, L.P. (“Fund VIII-A”), Berkshire Fund VII, L.P. ("Fund VII"), Berkshire Fund VII-A, L.P. ("Fund VII-A"), Berkshire Investors LLC ("Investors"), Berkshire Investors III LLC ("Investors III"), Berkshire Investors IV LLC (“Investors IV”), Stockbridge Fund, L.P. (f/k/a Stockbridge Special Situations Fund, L.P.) ("SF"), and Stockbridge Absolute Return Fund, L.P. ("SARF"). Because the Reporting Persons’ prior filing reflected that the Reporting Persons no longer beneficially own greater than 5% of the Issuer’s outstanding Common Stock, this Schedule 13D, Amendment number 7/A, only updates Item 5(e) of the prior filing and does not otherwise reflect the Reporting Persons’ beneficial ownership as of the date hereof.

Item 5(e) is amended in its entirety as follows:

(e)       As of August 27, 2019, the Reporting Persons no longer beneficially own more than 5% of the Issuer’s outstanding Common Stock.

Exhibit 99.1           Joint Filing Undertaking, dated as of November 26, 2019.

Signature

After reasonable inquiry and to the best of my knowledge and belief, the undersigned certifies that the information set forth in this Schedule 13D is true, complete and correct.

DATED: November 26, 2019

JOINT FILING UNDERTAKING

The undersigned, being duly authorized thereunto, hereby execute this agreement as an exhibit to this amendment to Schedule 13D to evidence the agreement of the below-named parties, in accordance with the rules promulgated pursuant to the Securities Exchange Act of 1934, to file this amendment to Schedule 13D jointly on behalf of each such party.

The execution and filing of this agreement shall not be construed as an admission that the below-named parties are a group, or have agreed to act as a group.

DATED: November 26, 2019