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

TransDigm (NYSE: TDG) COO sells 3,900 shares after exercising options

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

For TransDigm Group INC (TDG), Co-Chief Operating Officer Joel Reiss reported an option exercise and related share sales. On August 17, 2026 he exercised 3,900 stock options at a strike price of $284.97 per share, acquiring 3,900 shares of common stock. That same day he sold 3,900 common shares in multiple open-market transactions at weighted-average prices ranging from about $1,232.28 to $1,253.55 per share. Following the exercise, he held 8,000 stock options for TransDigm common stock. The filing indicates these transactions were made under a Rule 10b5-1 trading plan.

Positive

  • None.

Negative

  • None.
Insider Reiss Joel
Role Co-Chief Operating Officer
Sold 3,900 shs ($4.83M)
Approx. gross sale proceeds $4.83M
Approx. exercise cost $1.11M
Approx. pre-tax spread $3.72M
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 F1 140 $1,232.816 $173K
Sale Common Stock F2 260 $1,233.8684 $321K
Sale Common Stock F3 327 $1,234.9279 $404K
Sale Common Stock F4 373 $1,235.8581 $461K
Sale Common Stock F5 671 $1,236.799 $830K
Sale Common Stock F6 499 $1,237.868 $618K
Sale Common Stock F7 340 $1,238.8357 $421K
Sale Common Stock F8 400 $1,239.9924 $496K
Sale Common Stock F9 120 $1,240.778 $149K
Sale Common Stock F10 112 $1,242.2834 $139K
Sale Common Stock F11 138 $1,243.026 $172K
Sale Common Stock F12 100 $1,243.91 $124K
Sale Common Stock F13 145 $1,245.2852 $181K
Sale Common Stock F14 37 $1,245.897 $46K
Sale Common Stock F15 48 $1,247.3063 $60K
Sale Common Stock F16 60 $1,248.2583 $75K
Sale Common Stock F17 20 $1,250.823 $25K
Sale Common Stock F18 80 $1,252.1149 $100K
Sale Common Stock F19 30 $1,253.082 $38K
Holdings After Transaction: Stock Option — 8,000 shares (Direct); Common Stock — 3,600 shares (Direct)
Footnotes (19)
  1. F1. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,232.2750 - $1,233.1900. 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 $1,241.6000 - $1,242.5500. 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 $1,242.6200 - $1,243.5300. 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 $1,243.6700 - $1,244.5000. 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
  5. F13. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,244.7300 - $1,245.5800. 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 $1,245.7500 - $1,246.1600. 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 $1,246.8900 - $1,247.8550. 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 $1,247.9400 - $1,248.6700. 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
  9. F17. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,250.6200 - $1,251.0100. 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 $1,251.6500 - $1,252.5000. 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
  11. F19. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,252.7500 - $1,253.5500. 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 $1,233.3700 - $1,234.3600. 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. F3. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,234.3700 - $1,235.3600. 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. F4. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,235.4200 - $1,236.3800. 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
  15. F5. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,236.4300 - $1,237.4100. 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
  16. F6. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,237.4300 - $1,238.3900. 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. F7. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,238.4300 - $1,239.2900. 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
  18. F8. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,239.4400 - $1,240.4200. 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. F9. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,240.6000 - $1,241.2200. 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 options for TransDigm common stock exercised on August 17, 2026
Option Exercise Price $284.97 per share Strike price of the stock options exercised into 3,900 common shares
Shares Sold 3,900 shares Total TransDigm common shares sold in multiple transactions on August 17, 2026
Lowest Sale Price Range $1,232.2750 per share Lower bound of reported sale price range in footnote F1
Highest Sale Price Range $1,253.5500 per share Upper bound of reported sale price range in footnote F19
Remaining Options 8,000 shares Stock options for TransDigm common stock held after the reported exercise
Option Expiration Date November 8, 2027 Expiration date of the stock option series exercised on August 17, 2026
Rule 10b5-1 trading plan regulatory
"The filing indicates these transactions were made under a Rule 10b5-1 trading plan."
A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.
weighted average price financial
"Price reported constitutes the average weighted price of shares sold."
Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.
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""
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

What did TransDigm (TDG) executive Joel Reiss report in this Form 4?
Co-Chief Operating Officer Joel Reiss reported exercising 3,900 stock options and selling 3,900 common shares of TransDigm on August 17, 2026. The activity reflects an option exercise followed by same-day open-market sales at various prices.

How many TransDigm (TDG) shares did Joel Reiss sell and at what prices?
Joel Reiss sold a total of 3,900 TransDigm common shares on August 17, 2026. The sales occurred in multiple trades at weighted-average prices, with reported price ranges from about $1,232.28 up to $1,253.55 per share across the different transactions.

What options did Joel Reiss exercise in TransDigm (TDG) according to this filing?
He exercised 3,900 stock options for TransDigm common stock at a strike price of $284.97 per share. These options were originally exercisable beginning September 30, 2021 and are scheduled to expire on November 8, 2027 if not exercised earlier.

How many TransDigm (TDG) stock options does Joel Reiss hold after these transactions?
After exercising 3,900 options, Joel Reiss is reported to hold 8,000 stock options for TransDigm common stock. This figure reflects the position in the specific option series involved, as shown in the post-transaction derivative holdings in the Form 4 data.

Were Joel Reiss’s TransDigm (TDG) trades made under a Rule 10b5-1 plan?
Yes. The Form 4 indicates that these transactions were made under a Rule 10b5-1 trading plan. Such plans are pre-arranged trading programs that allow insiders to sell or buy shares according to preset instructions, independent of subsequent material nonpublic information.

What role does Joel Reiss hold at TransDigm (TDG) in this Form 4?
The reporting person, Joel Reiss, is identified as an officer of TransDigm Group INC, serving as Co-Chief Operating Officer. The reported option exercise and share sales relate to his holdings as a company officer with direct ownership of the affected securities.

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Form 4 Insider Transactions: What Each Field Means →
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)
08/17/2026		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 Stock08/17/2026M3,900A$284.977,500D
Common Stock08/17/2026S140D$1,232.816(1)7,360D
Common Stock08/17/2026S260D$1,233.8684(2)7,100D
Common Stock08/17/2026S327D$1,234.9279(3)6,773D
Common Stock08/17/2026S373D$1,235.8581(4)6,400D
Common Stock08/17/2026S671D$1,236.799(5)5,729D
Common Stock08/17/2026S499D$1,237.868(6)5,230D
Common Stock08/17/2026S340D$1,238.8357(7)4,890D
Common Stock08/17/2026S400D$1,239.9924(8)4,490D
Common Stock08/17/2026S120D$1,240.778(9)4,370D
Common Stock08/17/2026S112D$1,242.2834(10)4,258D
Common Stock08/17/2026S138D$1,243.026(11)4,120D
Common Stock08/17/2026S100D$1,243.91(12)4,020D
Common Stock08/17/2026S145D$1,245.2852(13)3,875D
Common Stock08/17/2026S37D$1,245.897(14)3,838D
Common Stock08/17/2026S48D$1,247.3063(15)3,790D
Common Stock08/17/2026S60D$1,248.2583(16)3,730D
Common Stock08/17/2026S20D$1,250.823(17)3,710D
Common Stock08/17/2026S80D$1,252.1149(18)3,630D
Common Stock08/17/2026S30D$1,253.082(19)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$284.9708/17/2026M3,90009/30/202111/08/2027Common Stock3,900$0.008,000D
Explanation of Responses:
1. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,232.2750 - $1,233.1900. 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 $1,233.3700 - $1,234.3600. 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 $1,234.3700 - $1,235.3600. 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 $1,235.4200 - $1,236.3800. 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
5. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,236.4300 - $1,237.4100. 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
6. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,237.4300 - $1,238.3900. 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 $1,238.4300 - $1,239.2900. 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
8. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,239.4400 - $1,240.4200. 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 $1,240.6000 - $1,241.2200. 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 $1,241.6000 - $1,242.5500. 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 $1,242.6200 - $1,243.5300. 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 $1,243.6700 - $1,244.5000. 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
13. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,244.7300 - $1,245.5800. 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 $1,245.7500 - $1,246.1600. 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 $1,246.8900 - $1,247.8550. 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 $1,247.9400 - $1,248.6700. 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. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,250.6200 - $1,251.0100. 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 $1,251.6500 - $1,252.5000. 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
19. Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,252.7500 - $1,253.5500. 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 Reiss08/18/2026
** 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