TransDigm (TDG) Co-COO exercises options, sells 3,900 shares in open market

Rhea-AI Filing Summary

TransDigm Group’s Co‑Chief Operating Officer Joel Reiss exercised stock options and then sold shares in the open market. He exercised options for 3,900 shares of common stock at an exercise price of $284.97 per share and acquired the underlying shares.

On the same date, he sold 3,900 common shares in a series of transactions at prices around $1,222.87 to $1,250.65 per share, leaving him with 3,600 common shares held directly. Following the option exercise, he also continues to hold 27,500 stock options scheduled to expire on November 8, 2027. This filing reflects a routine exercise‑and‑sell transaction by a senior executive rather than a change in company operations.

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

OMB Number:			3235-0287
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hours per response:			0.5

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)
03/16/2026

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	03/16/2026		M		3,900	A	$284.97	7,500	D
Common Stock	03/16/2026		S		20	D	$1,222.87	7,480	D
Common Stock	03/16/2026		S		70	D	$1,231.6886(1)	7,410	D
Common Stock	03/16/2026		S		60	D	$1,232.5712(2)	7,350	D
Common Stock	03/16/2026		S		50	D	$1,233.618(3)	7,300	D
Common Stock	03/16/2026		S		40	D	$1,235.125(4)	7,260	D
Common Stock	03/16/2026		S		56	D	$1,236.312(5)	7,204	D
Common Stock	03/16/2026		S		134	D	$1,237.746(6)	7,070	D
Common Stock	03/16/2026		S		160	D	$1,238.5745(7)	6,910	D
Common Stock	03/16/2026		S		260	D	$1,239.9445(8)	6,650	D
Common Stock	03/16/2026		S		420	D	$1,240.917(9)	6,230	D
Common Stock	03/16/2026		S		320	D	$1,241.985(10)	5,910	D
Common Stock	03/16/2026		S		350	D	$1,242.9959(11)	5,560	D
Common Stock	03/16/2026		S		120	D	$1,244.0865(12)	5,440	D
Common Stock	03/16/2026		S		90	D	$1,245.1022(13)	5,350	D
Common Stock	03/16/2026		S		227	D	$1,246.2083(14)	5,123	D
Common Stock	03/16/2026		S		531	D	$1,247.0797(15)	4,592	D
Common Stock	03/16/2026		S		490	D	$1,248.2365(16)	4,102	D
Common Stock	03/16/2026		S		315	D	$1,249.2884(17)	3,787	D
Common Stock	03/16/2026		S		187	D	$1,250.2542(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	03/16/2026		M			3,900	09/30/2021	11/08/2027	Common Stock	3,900	$0	27,500	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 $1,231.1800 - $1,232.0700. 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 $1,232.2500 - $1,232.9900. 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.

3. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,233.3300 - $1,234.1000. 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 $1,234.6100 - $1,235.5600. 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 $1,235.8600 - $1,236.8500. 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 $1,237.1600 - $1,238.1400. 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 $1,238.1900 - $1,239.1100. 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 $1,239.3200 - $1,240.2900. 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 $1,240.3900 - $1,241.2800. 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 $1,241.5000 - $1,242.4800. 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 $1,242.5000 - $1,243.4800. 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 $1,243.5100 - $1,244.4400. 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 $1,244.5100 - $1,245.4800. 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 $1,245.5300 - $1,246.5200. 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 $1,246.5900 - $1,247.5700. 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 $1,247.6400 - $1,248.6200. 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 $1,248.6400 - $1,249.5900. 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 $1,249.6800 - $1,250.6500. 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	03/17/2026
	** 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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

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

Joel Reiss reported exercising 3,900 stock options and selling 3,900 common shares. He converted options with a $284.97 exercise price into stock, then sold all those shares in multiple open‑market trades on the same date.

At what prices did Joel Reiss sell TransDigm (TDG) shares in this Form 4?

He sold 3,900 TransDigm common shares in numerous trades at prices around $1,222.87 to $1,250.65 per share. Footnotes explain these are weighted average prices across trades executed within narrow intraday price ranges.

How many TransDigm (TDG) shares does Joel Reiss hold after this Form 4 transaction?

After the reported sales, Joel Reiss directly holds 3,600 TransDigm common shares. Before selling, he held 7,500 common shares; the Form 4 shows his position decreasing as he disposed of 3,900 shares through open‑market transactions.

What happened to Joel Reiss’s TransDigm (TDG) stock options in this filing?

He exercised 3,900 stock options with a $284.97 exercise price, receiving 3,900 common shares. Following this exercise, he continues to hold 27,500 remaining options, which are scheduled to expire on November 8, 2027, according to the Form 4 data.

Is Joel Reiss’s TransDigm (TDG) Form 4 a purchase or sale overall?

Overall, the Form 4 reflects a net sale. Although he exercised options to acquire 3,900 shares, he sold all 3,900 acquired shares in open‑market transactions, reducing his direct common‑stock holdings from 7,500 shares to 3,600 shares.

Does this TransDigm (TDG) Form 4 indicate any pre-planned trading arrangement?

The footnotes describe weighted‑average sale prices in specified ranges but do not reference any Rule 10b5‑1 or other pre‑planned trading arrangements. They state he will provide detailed trade‑level pricing information to regulators or shareholders upon request.