TransDigm (NYSE: TDG) Co-COO details option exercise and share sales

Rhea-AI Filing Summary

TransDigm Group’s Co-Chief Operating Officer Joel Reiss reported an insider transaction involving stock options and common shares on January 15, 2026. He exercised 3,900 stock options at an exercise price of $284.97 per share, receiving the same number of TransDigm common shares. On the same date, he sold common stock in a series of small trades, each reported with an average weighted sale price, at levels ranging from about $1,420 to $1,439 per share. After these transactions, he directly owned 3,600 shares of TransDigm common stock and 35,300 stock options. The footnotes clarify that each reported sale price is a weighted average, with full price breakdowns available to regulators or shareholders on request.

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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

OMB APPROVAL

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

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Reiss Joel

(Last) (First) (Middle)

1350 EUCLID AVE

SUITE 1600

(Street)

CLEVELAND OH 44115

(City) (State) (Zip)

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)
	Co-Chief Operating Officer

3. Date of Earliest Transaction (Month/Day/Year)
01/15/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

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. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction 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	01/15/2026		M		3,900	A	$284.97	7,500	D
Common Stock	01/15/2026		S		44	D	$1,420.375(1)	7,456	D
Common Stock	01/15/2026		S		67	D	$1,421.8916(2)	7,389	D
Common Stock	01/15/2026		S		95	D	$1,422.628(3)	7,294	D
Common Stock	01/15/2026		S		128	D	$1,423.8024(4)	7,166	D
Common Stock	01/15/2026		S		90	D	$1,425.104(5)	7,076	D
Common Stock	01/15/2026		S		245	D	$1,426.3497(6)	6,831	D
Common Stock	01/15/2026		S		396	D	$1,427.2718(7)	6,435	D
Common Stock	01/15/2026		S		477	D	$1,428.0254(8)	5,958	D
Common Stock	01/15/2026		S		260	D	$1,429.1449(9)	5,698	D
Common Stock	01/15/2026		S		372	D	$1,430.2077(10)	5,326	D
Common Stock	01/15/2026		S		453	D	$1,431.2593(11)	4,873	D
Common Stock	01/15/2026		S		257	D	$1,432.3994(12)	4,616	D
Common Stock	01/15/2026		S		486	D	$1,433.3583(13)	4,130	D
Common Stock	01/15/2026		S		200	D	$1,434.177(14)	3,930	D
Common Stock	01/15/2026		S		205	D	$1,435.1371(15)	3,725	D
Common Stock	01/15/2026		S		35	D	$1,436.1486(16)	3,690	D
Common Stock	01/15/2026		S		50	D	$1,437.5608(17)	3,640	D
Common Stock	01/15/2026		S		40	D	$1,438.9075(18)	3,600	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction 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 (Month/Day/Year)		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: 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	$284.97	01/15/2026		M			3,900	09/30/2021	11/08/2027	Common Stock	3,900	$0	35,300	D

Explanation of Responses:

1. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,420.0100 - $1,420.9900. 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.

2. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,421.1300 - $1,422.0800. 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.

3. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,422.2800 - $1,423.1700. 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.

4. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,423.4100 - $1,424.4000. 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.

5. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,424.4600 - $1,425.3400. 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.

6. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,425.7100 - $1,426.6800. 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.

7. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,426.7300 - $1,427.7200. 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.

8. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,427.7400 - $1,428.7200. 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.

9. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,428.7700 - $1,429.7200. 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.

10. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,429.8000 - $1,430.7500. 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.

11. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,430.8000 - $1,431.7800. 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.

12. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,431.8500 - $1,432.8400. 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.

13. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,432.8500 - $1,433.7400. 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.

14. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,433.8500 - $1,434.5100. 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.

15. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,434.8800 - $1,435.8400. 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.

16. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,435.9000 - $1,436.3300. 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.

17. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,436.9500 - $1,437.7600. 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.

18. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,438.8500 - $1,439.0800. 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.

	/s/ Rachel L. Quinlan as attorney in fact for Joel Reiss	01/16/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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FAQ

What insider transaction did TransDigm (TDG) report for Joel Reiss?

The filing shows Co-Chief Operating Officer Joel Reiss exercised 3,900 stock options and sold TransDigm common shares in multiple trades on January 15, 2026.

How many TransDigm stock options did Joel Reiss exercise in this Form 4?

He exercised 3,900 stock options at an exercise price of $284.97 per share, receiving 3,900 shares of TransDigm common stock.

At what prices did Joel Reiss sell TransDigm (TDG) common stock?

The sales were reported at weighted average prices, with individual trades in ranges between roughly $1,420.01 and $1,439.08 per share, as detailed in the footnotes.

How many TransDigm shares does Joel Reiss own after the reported transactions?

Following the transactions, Joel Reiss directly owned 3,600 shares of TransDigm common stock.

How many TransDigm stock options does Joel Reiss hold after this Form 4 transaction?

After exercising 3,900 options, he held 35,300 stock options beneficially owned on a direct basis.

What do the weighted average price footnotes in the TransDigm Form 4 mean?

Each sale line shows a weighted average price, with the footnotes stating that shares were sold at various prices within a given range. Full trade-level price details are available to the SEC, the issuer, or any security holder upon request.