Statement of Changes in Beneficial Ownership (4)

FORM 4

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

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3235-0287

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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person * Iversen Bernt G II	2. Issuer Name and Ticker or Trading Symbol TransDigm Group INC [ TDG ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director                    _____ 10% Owner __X__ Officer (give title below)    _____ Other (specify below) Executive Vice President
(Last)          (First)          (Middle) CHAMPION AEROSPACE LLC, 1230 OLD NORRIS ROAD	3. Date of Earliest Transaction (MM/DD/YYYY) 1/21/2020
(Street) LIBERTY, SC 29657 (City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. Code (Instr. 8)		4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	1/21/2020		M		8335	A	$70.45	13345	D
Common Stock	1/21/2020		S		100	D	$633.276	13245	D
Common Stock	1/21/2020		S		500	D	$636.182	12745	D
Common Stock	1/21/2020		S		450	D	$637.3078	12295	D
Common Stock	1/21/2020		S		2463	D	$638.6606	9832	D
Common Stock	1/21/2020		S		900	D	$639.5061	8932	D
Common Stock	1/21/2020		S		1660	D	$640.9293	7272	D
Common Stock	1/21/2020		S		1786	D	$641.9154	5486	D
Common Stock	1/21/2020		S		476	D	$642.6106	5010	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option	$70.45	1/21/2020		M			8335	9/30/2011	12/10/2020	Common Stock	8335	$0.00	0	D

Explanation of Responses:

Remarks: All transactions reported hereunder were made pursuant to an established 10b5-1 plan.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Iversen Bernt G II CHAMPION AEROSPACE LLC 1230 OLD NORRIS ROAD LIBERTY, SC 29657			Executive Vice President

Signatures
Halle Fine Terrion as attorney in fact for Bernt G. Iversen II.		1/22/2020
**Signature of Reporting Person		Date