TransDigm Group COO amends 3,900-share option filing

TransDigm Group executive Joel Reiss, Co-Chief Operating Officer, reported exercising stock options covering 3,900 shares of common stock on July 15, 2026 at an exercise price of $284.97 per share, leaving 11,900 options outstanding.

Rhea-AI Filing Summary

TransDigm Group executive Joel Reiss, Co-Chief Operating Officer, reported exercising stock options covering 3,900 shares of common stock on July 15, 2026 at an exercise price of $284.97 per share, leaving 11,900 options outstanding. The amended filing corrects the coding of this derivative transaction from an acquisition to a disposition and indicates it was effected under a Rule 10b5-1 trading plan.

Insider Trade Summary 10b5-1

3,900 shares exercised/converted

Exercise 1 txn

Insider Reiss Joel

Role Co-Chief Operating Officer

Type	Security	Shares	Price	Value
Exercise	Stock Option F1	3,900	$0.00	$0.00

Holdings After Transaction: Stock Option — 11,900 contracts (Direct)

Footnotes (1)

1. F1. This Form 4/A amends the Form 4 originally filed on 07.16.2026 to correct the reporting of the transaction in Table II, which was inadvertently reported as an acquisition ('A') rather than a disposition ('D'). No other changes have been made to the original filing.

Key Figures

Options exercised: 3,900 shares Exercise price: $284.97 per share Options remaining: 11,900 shares +2 more

5 metrics

Options exercised 3,900 shares Stock options exercised on July 15, 2026

Exercise price $284.97 per share Conversion or exercise price of the stock options

Options remaining 11,900 shares Total derivative shares following the reported transaction

Option expiration November 8, 2027 Expiration date of the reported stock option grant

10b5-1 plan status Affirmed Filing-level checkbox indicates transaction under a Rule 10b5-1 plan

Key Terms

Form 4/A, disposition, derivative security, Stock Option

4 terms

Form 4/A regulatory

"This Form 4/A amends the Form 4 originally filed on 07.16.2026"

Form 4/A is an amended filing that corrects or updates an earlier Form 4, the mandatory report that insiders (like company executives, directors, or large shareholders) must file when their ownership stakes change. Think of it as an edited receipt showing who bought or sold stock and when; investors use it to track insider confidence, detect potential conflicts, and spot trading patterns that might signal future company prospects.

disposition regulatory

"reported as an acquisition ('A') rather than a disposition ('D')"

derivative security financial

"transaction code description: Exercise or conversion of derivative security"

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

Stock Option financial

"security_title: Stock Option, underlying security: Common Stock"

A stock option is a contract that gives you the right to buy or sell a company's stock at a specific price within a certain time frame. People use them to potentially make money if the stock's price moves favorably or to protect against losses. It's like holding a coupon that can be used to buy or sell stock at a set price later on.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did TransDigm (TDG) Co-Chief Operating Officer Joel Reiss report in this Form 4/A amendment?

Joel Reiss reported exercising stock options for 3,900 shares of TransDigm common stock on July 15, 2026 at an exercise price of $284.97 per share, a derivative exercise that left 11,900 stock options remaining after the transaction.

Why did TransDigm (TDG) file an amended Form 4/A for Joel Reiss’s option transaction?

The amendment was filed to correct the transaction’s coding in the derivative table, which was initially reported as an acquisition (“A”) but should have been a disposition (“D”). The company states that no other changes were made to the original Form 4.

How many TransDigm (TDG) stock options does Joel Reiss hold after the reported transaction?

Following the derivative exercise, Joel Reiss is reported as holding 11,900 stock options. This figure reflects the total derivative shares following the transaction as disclosed, and relates specifically to the options referenced in the amended Form 4/A.

At what price were the TransDigm (TDG) stock options exercised in Joel Reiss’s amended Form 4/A?

The options were exercised at an exercise price of $284.97 per share, as shown in the derivative transaction details. This represents the conversion price for each underlying share of TransDigm common stock associated with the 3,900 options exercised.

Was Joel Reiss’s TransDigm (TDG) option transaction made under a Rule 10b5-1 trading plan?

Yes. The filing indicates that the reported option exercise was effected under a Rule 10b5-1 trading plan. Such plans provide for pre-arranged trading instructions, which can limit the informational value of the transaction’s timing for outside investors.

What type of security is involved in the TransDigm (TDG) Form 4/A filed for Joel Reiss?

The transaction involves a stock option derivative security convertible into TransDigm common stock. The amended report classifies the event as an exercise or conversion of derivative security affecting 3,900 underlying shares with options expiring on November 8, 2027.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Accepted by SEC EDGAR 07/21/2026 - 04:48 PM EDT Learn about SEC filing dates

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
Estimated average burden
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 OHIO 44115

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/15/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)
07/16/2026

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

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	07/15/2026		M			3,900(1)	09/30/2021	11/08/2027	Common Stock	3,900	$0.00	11,900	D

Explanation of Responses:

1. This Form 4/A amends the Form 4 originally filed on 07.16.2026 to correct the reporting of the transaction in Table II, which was inadvertently reported as an acquisition ('A') rather than a disposition ('D'). No other changes have been made to the original filing.

Remarks:

	/s/ Rachel L. Quinlan as attorney in fact for Joel Reiss	07/21/2026
	** 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.
* Form 4: SEC 1474 (03-26)