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  4. [Form 4] TransDigm Group INC Insider Trading Activity

TransDigm Co-COO exercises options, sells 3,900 shares

Filing Impact
(Neutral)
Filing Sentiment

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Form Type
4

Rhea-AI Filing Summary

TransDigm Group’s Co-Chief Operating Officer Joel Reiss exercised stock options for 3,900 shares of common stock at an exercise price of $284.9700 per share and on the same date sold 3,900 shares in multiple open-market transactions at prices ranging from $1,273.8500 to $1,294.8000. Following these transactions, he holds 3,600 shares of TransDigm common stock directly.

Insider Reiss Joel
Role Co-Chief Operating Officer
Sold 3,900 shs ($4.99M)
Approx. gross sale proceeds $4.99M
Approx. exercise cost $1.11M
Approx. pre-tax spread $3.88M
Type Security Shares Price Value
Exercise Stock Option 3,900 $0.00 $0.00
Exercise Common Stock 3,900 $284.97 $1.11M
Sale Common Stock 233 $1,274.5734 $297K
Sale Common Stock 120 $1,275.1864 $153K
Sale Common Stock 383 $1,276.488 $489K
Sale Common Stock 203 $1,277.2264 $259K
Sale Common Stock 390 $1,278.4101 $499K
Sale Common Stock 519 $1,279.3857 $664K
Sale Common Stock 574 $1,280.4109 $735K
Sale Common Stock 377 $1,281.5819 $483K
Sale Common Stock 308 $1,282.3706 $395K
Sale Common Stock 326 $1,283.5465 $418K
Sale Common Stock 165 $1,284.5919 $212K
Sale Common Stock 32 $1,285.3288 $41K
Sale Common Stock 100 $1,286.567 $129K
Sale Common Stock 10 $1,289.245 $13K
Sale Common Stock 57 $1,291.763 $74K
Sale Common Stock 53 $1,292.6636 $69K
Sale Common Stock 50 $1,294.772 $65K
Holdings After Transaction: Stock Option — 23,600 contracts (Direct); Common Stock — 3,600 shares (Direct)
Footnotes (16)
  1. F1. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,273.8500 - $1,274.7400. 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
  2. F2. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,274.9200 - $1,275.7800. 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
  3. F3. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,275.9300 - $1,276.9200. 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. F4. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,276.9400 - $1,277.9300. 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. F5. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,277.9600 - $1,278.9300. 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. F6. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,278.9600 - $1,279.9500. 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. F7. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,279.9800 - $1,280.9700. 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. F8. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,280.9800 - $1,281.9700. 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. F9. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,282.0100 - $1,282.9900. 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
  10. F10. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,283.0300 - $1,284.0200. 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. F11. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,284.0400 - $1,285.0300. 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. F12. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,285.0500 - $1,285.9200. 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. F13. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,286.1400 - $1,287.0200. 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. F14. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,291.3400 - $1,292.0800. 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
  15. F15. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,292.3900 - $1,292.6900. 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. F16. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,294.7400 - $1,294.8000. 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
Options exercised 3,900 shares Stock option for common stock exercised on 2026-04-15
Exercise price $284.9700 per share Conversion or exercise price of stock option
Shares sold 3,900 shares Total common shares sold in open-market transactions
Sample sale price $1,274.5734 per share One reported transaction price for common stock sale
Highest price range upper bound $1,294.8000 Upper end of disclosed sale price range in footnotes
Shares held after transactions 3,600 shares Direct common stock ownership after all reported trades
Option expiration November 8, 2027 Expiration date of exercised stock option
Net buy/sell shares -3,900 shares Net share change across all reported transactions
Stock Option financial
"security_title": "Stock Option""
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.
open-market sale financial
"transaction_action": "open-market sale""
An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.
average weighted price financial
"Price reported constitutes the average weighted price of shares sold."
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.
non-derivative financial
"transaction_type": "non-derivative""

FAQ

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

What did TransDigm (TDG) executive Joel Reiss do in this Form 4 filing?
Joel Reiss exercised stock options for 3,900 TransDigm shares at $284.9700 each, then sold 3,900 common shares in multiple open-market transactions. These moves convert option-based compensation into cash while leaving him with a remaining direct share position.

How many TransDigm (TDG) shares did Joel Reiss sell and at what prices?
He sold 3,900 TransDigm common shares in a series of open-market trades. Reported weighted-average sale prices ranged from about $1,273.8500 up to $1,294.8000, with detailed price ranges provided for each transaction group in the footnotes.

What stock options did Joel Reiss exercise in TransDigm (TDG)?
He exercised a stock option covering 3,900 TransDigm common shares at a conversion or exercise price of $284.9700 per share. The option had an original exercise date of September 30, 2021 and an expiration date of November 8, 2027.

How many TransDigm (TDG) shares does Joel Reiss own after these transactions?
After exercising options and selling 3,900 shares, Joel Reiss directly holds 3,600 TransDigm common shares. This post-transaction holding reflects the net position reported, with no remaining derivative positions listed in the derivative summary section.

Were Joel Reiss’s TransDigm (TDG) share sales under a trading plan?
The filing describes the sales as open-market transactions with average weighted prices and detailed ranges, but does not reference any Rule 10b5-1 or other pre-arranged trading plan in the provided footnotes. It focuses on price ranges and the reporting person’s undertaking to supply detailed breakdowns.

How are the sale prices for TransDigm (TDG) shares disclosed in this Form 4?
Each sale line reports a weighted-average price, while footnotes give exact price ranges, such as $1,273.8500–$1,274.7400. The reporting person undertakes to provide full information on the number of shares sold at each separate price upon request.

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

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Accepted by SEC EDGAR
SEC Form 4
FORM 4UNITED 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)
Director10% Owner
XOfficer (give title below)Other (specify below)
Co-Chief Operating Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
04/15/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

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)
CodeVAmount(A) or (D)Price
Common Stock04/15/2026M3,900A$284.977,500D
Common Stock04/15/2026S233D$1,274.5734(1)7,267D
Common Stock04/15/2026S120D$1,275.1864(2)7,147D
Common Stock04/15/2026S383D$1,276.488(3)6,764D
Common Stock04/15/2026S203D$1,277.2264(4)6,561D
Common Stock04/15/2026S390D$1,278.4101(5)6,171D
Common Stock04/15/2026S519D$1,279.3857(6)5,652D
Common Stock04/15/2026S574D$1,280.4109(7)5,078D
Common Stock04/15/2026S377D$1,281.5819(8)4,701D
Common Stock04/15/2026S308D$1,282.3706(9)4,393D
Common Stock04/15/2026S326D$1,283.5465(10)4,067D
Common Stock04/15/2026S165D$1,284.5919(11)3,902D
Common Stock04/15/2026S32D$1,285.3288(12)3,870D
Common Stock04/15/2026S100D$1,286.567(13)3,770D
Common Stock04/15/2026S10D$1,289.2453,760D
Common Stock04/15/2026S57D$1,291.763(14)3,703D
Common Stock04/15/2026S53D$1,292.6636(15)3,650D
Common Stock04/15/2026S50D$1,294.772(16)3,600D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Option$284.9704/15/2026M3,90009/30/202111/08/2027Common Stock3,900$023,600D
Explanation of Responses:
1. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,273.8500 - $1,274.7400. 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
2. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,274.9200 - $1,275.7800. 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
3. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,275.9300 - $1,276.9200. 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 $1,276.9400 - $1,277.9300. 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 $1,277.9600 - $1,278.9300. 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 $1,278.9600 - $1,279.9500. 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 $1,279.9800 - $1,280.9700. 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 $1,280.9800 - $1,281.9700. 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 $1,282.0100 - $1,282.9900. 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
10. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,283.0300 - $1,284.0200. 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 $1,284.0400 - $1,285.0300. 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 $1,285.0500 - $1,285.9200. 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 $1,286.1400 - $1,287.0200. 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 $1,291.3400 - $1,292.0800. 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
15. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,292.3900 - $1,292.6900. 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 $1,294.7400 - $1,294.8000. 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 Reiss04/16/2026
** Signature of Reporting PersonDate
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)

Source: View Original Filing on SEC EDGAR

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