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

TransDigm COO Joel Reiss sells 4,100 shares

All reported transactions were under a Rule 10b5-1 plan, and the 4,100 shares acquired through option exercise were also the number sold.

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Form Type
4

Rhea-AI Filing Summary

Joel Reiss, TransDigm Group's Co-Chief Operating Officer, exercised options to acquire 4,100 common shares at an exercise price of $284.97 per share on October 15, 2026, and sold 4,100 shares in 21 transactions that day. The reported weighted-average prices for individual sales ranged from $1,112.2650 to $1,135.9542 per share; footnotes give execution-price ranges spanning $1,111.9600 to $1,136.2400. The transactions were under a Rule 10b5-1 plan.

Insider Reiss Joel
Role Co-Chief Operating Officer
Sold 4,100 shs ($4.62M)
Approx. gross sale proceeds $4.62M
Approx. exercise cost $1.17M
Approx. pre-tax spread $3.46M
Type Security Shares Price Value
Exercise Stock Option 4,100 $0.00 $0.00
Exercise Common Stock 4,100 $284.97 $1.17M
Sale Common Stock F1 20 $1,112.265 $22K
Sale Common Stock F2 100 $1,113.5836 $111K
Sale Common Stock F3 100 $1,114.8205 $111K
Sale Common Stock F4 50 $1,116.024 $56K
Sale Common Stock F5 60 $1,117.11 $67K
Sale Common Stock F6 100 $1,119.0135 $112K
Sale Common Stock F7 30 $1,120.3033 $34K
Sale Common Stock F8 60 $1,121.5767 $67K
Sale Common Stock F9 131 $1,123.0856 $147K
Sale Common Stock F10 306 $1,124.00 $344K
Sale Common Stock F11 600 $1,125.0009 $675K
Sale Common Stock F12 278 $1,125.8595 $313K
Sale Common Stock F13 305 $1,127.0115 $344K
Sale Common Stock F14 120 $1,127.9018 $135K
Sale Common Stock F15 150 $1,129.3783 $169K
Sale Common Stock F16 100 $1,130.056 $113K
Sale Common Stock F17 130 $1,131.3268 $147K
Sale Common Stock F18 210 $1,132.2985 $238K
Sale Common Stock F19 317 $1,133.8868 $359K
Sale Common Stock F20 495 $1,134.9967 $562K
Sale Common Stock F21 438 $1,135.9542 $498K
Holdings After Transaction: Stock Option — 0 contracts (Direct); Common Stock — 3,600 shares (Direct)
Footnotes (21)
  1. F1. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,111.9600 - $1,112.5700. 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.
  2. F10. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,123.4400 - $1,124.4100. 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. F11. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,124.4600 - $1,125.4400. 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.
  4. F12. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,125.4800 - $1,126.3300. 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.
  5. F13. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,126.4800 - $1,127.4500. 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. F14. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,127.6400 - $1,128.5000. 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. F15. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,128.7700 - $1,129.7600. 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.
  8. F16. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,129.8000 - $1,130.7600. 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.
  9. F17. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,130.9100 - $1,131.7800. 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.
  10. F18. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,131.9200 - $1,132.8800. 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. F19. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,133.4400 - $1,134.4150. 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. F2. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,113.2100 - $1,114.0300. 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.
  13. F20. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,134.4700 - $1,135.4500. 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. F21. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,135.5100 - $1,136.2400. 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. F3. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,114.5200 - $1,115.1300. 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. F4. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,115.7000 - $1,116.6700. 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. F5. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,116.7500 - $1,117.6800. 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.
  18. F6. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,118.6700 - $1,119.2000. 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.
  19. F7. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,120.2200 - $1,120.3500. 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.
  20. F8. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,121.2600 - $1,122.0700. 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.
  21. F9. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,122.4300 - $1,123.3800. 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 4,100 shares October 15, 2026
Exercise price $284.97 per share Options exercised October 15, 2026
Common shares acquired through exercise 4,100 shares October 15, 2026
Common shares sold 4,100 shares 21 transactions on October 15, 2026
Reported weighted-average sale prices $1,112.2650 to $1,135.9542 per share Individual sale transactions on October 15, 2026
Sale execution-price ranges $1,111.9600 to $1,136.2400 per share Ranges stated in transaction footnotes
Stock-option balance following transaction 0 shares Reported after the October 15, 2026 exercise
Rule 10b5-1 regulatory
"Transactions were under a Rule 10b5-1 plan"
Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.
average weighted price financial
"Price reported constitutes the average weighted price of shares sold"
Stock Option financial
"Stock Option exercised for 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.

How many TDG shares did Joel Reiss sell, and at what prices?
Joel Reiss sold 4,100 shares on October 15, 2026, in 21 transactions under a Rule 10b5-1 plan. Reported weighted-average prices ranged from $1,112.2650 to $1,135.9542 per share; the footnotes state that execution prices across the sales ranged from $1,111.9600 to $1,136.2400.

How many TDG options did Joel Reiss exercise, and at what exercise price?
Joel Reiss exercised options to acquire 4,100 common shares on October 15, 2026, at an exercise price of $284.97 per share. The reported stock-option balance following that transaction was 0 shares.

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

Form 4 Insider Transactions: What Each Field Means →
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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)
10/15/2026		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 Stock10/15/2026M4,100A$284.977,700D
Common Stock10/15/2026S20D$1,112.265(1)7,680D
Common Stock10/15/2026S100D$1,113.5836(2)7,580D
Common Stock10/15/2026S100D$1,114.8205(3)7,480D
Common Stock10/15/2026S50D$1,116.024(4)7,430D
Common Stock10/15/2026S60D$1,117.11(5)7,370D
Common Stock10/15/2026S100D$1,119.0135(6)7,270D
Common Stock10/15/2026S30D$1,120.3033(7)7,240D
Common Stock10/15/2026S60D$1,121.5767(8)7,180D
Common Stock10/15/2026S131D$1,123.0856(9)7,049D
Common Stock10/15/2026S306D$1,124(10)6,743D
Common Stock10/15/2026S600D$1,125.0009(11)6,143D
Common Stock10/15/2026S278D$1,125.8595(12)5,865D
Common Stock10/15/2026S305D$1,127.0115(13)5,560D
Common Stock10/15/2026S120D$1,127.9018(14)5,440D
Common Stock10/15/2026S150D$1,129.3783(15)5,290D
Common Stock10/15/2026S100D$1,130.056(16)5,190D
Common Stock10/15/2026S130D$1,131.3268(17)5,060D
Common Stock10/15/2026S210D$1,132.2985(18)4,850D
Common Stock10/15/2026S317D$1,133.8868(19)4,533D
Common Stock10/15/2026S495D$1,134.9967(20)4,038D
Common Stock10/15/2026S438D$1,135.9542(21)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$284.9710/15/2026M4,10009/30/202111/08/2027Common Stock4,100$0.000.00D
Explanation of Responses:
1. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,111.9600 - $1,112.5700. 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.
2. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,113.2100 - $1,114.0300. 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.
3. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,114.5200 - $1,115.1300. 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 $1,115.7000 - $1,116.6700. 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 $1,116.7500 - $1,117.6800. 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.
6. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,118.6700 - $1,119.2000. 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 $1,120.2200 - $1,120.3500. 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 $1,121.2600 - $1,122.0700. 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.
9. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,122.4300 - $1,123.3800. 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 $1,123.4400 - $1,124.4100. 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 $1,124.4600 - $1,125.4400. 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.
12. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,125.4800 - $1,126.3300. 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.
13. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,126.4800 - $1,127.4500. 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 $1,127.6400 - $1,128.5000. 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 $1,128.7700 - $1,129.7600. 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.
16. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,129.8000 - $1,130.7600. 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.
17. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,130.9100 - $1,131.7800. 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.
18. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,131.9200 - $1,132.8800. 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.
19. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,133.4400 - $1,134.4150. 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.
20. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,134.4700 - $1,135.4500. 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.
21. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,135.5100 - $1,136.2400. 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.
Remarks:
/s/ Rachel L. Quinlan as attorney in fact for Joel Reiss10/16/2026
** 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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