TransDigm officer plans $8.9M stock sale

An executive of TransDigm Group INC filed a Rule 144 notice covering 8,000 shares from stock option exercises, following recent 10b5‑1 sales.

Rhea-AI Filing Summary

TransDigm Group INC (TDG) disclosed that officer Joel Reiss filed a notice to sell up to 8,000 shares of TransDigm common stock under Rule 144. The shares are to be sold through Morgan Stanley Smith Barney on or after September 15, 2026, and will be received upon the exercise of stock options for cash. The filing notes that the dates of acquisition and payment are, and will be, the dates of option exercise and related sale over the next three months.

The notice also reports prior Rule 10b5‑1 sales during the past three months, including 3,900 shares sold on August 17, 2026 for aggregate proceeds of $4,831,152.30 and 3,900 shares sold on July 15, 2026 for aggregate proceeds of $4,749,372.42.

Key Figures

Shares covered by current notice: 8,000 shares Aggregate market value of shares in notice: $8,889,760.00 Shares sold on August 17, 2026: 3,900 shares +3 more

6 metrics

Shares covered by current notice 8,000 shares Common stock to be sold under Rule 144 around September 15, 2026

Aggregate market value of shares in notice $8,889,760.00 Referenced in connection with the 8,000 shares of common stock

Shares sold on August 17, 2026 3,900 shares 10b5-1 sale reported for Joel B. Reiss

Proceeds on August 17, 2026 sale $4,831,152.30 Aggregate proceeds from 3,900-share 10b5-1 sale

Shares sold on July 15, 2026 3,900 shares 10b5-1 sale reported for Joel B. Reiss

Proceeds on July 15, 2026 sale $4,749,372.42 Aggregate proceeds from 3,900-share 10b5-1 sale

Key Terms

Rule 144, 10b5-1, Exercise of Stock Options, Issuer

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

10b5-1 regulatory

"10b5-1 Sales for JOEL B REISS 1350 Euclid Avenue, Suite 1600"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Exercise of Stock Options financial

"Common | 09/15/2026 | Exercise of Stock Options | Issuer"

Issuer regulatory

"Common | 09/15/2026 | Exercise of Stock Options | Issuer"

FAQ

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

What does the Form 144 filing disclose for TransDigm Group INC (TDG)?

It discloses that officer Joel Reiss filed a Rule 144 notice to sell up to 8,000 shares of TransDigm common stock, to be received from the exercise of stock options for cash around September 15, 2026 and over the following three months.

How many TransDigm (TDG) shares are covered by the new Rule 144 notice?

The notice covers up to 8,000 shares of TransDigm common stock. These shares are expected to be acquired through the exercise of stock options and then sold, with an aggregate market value referenced at about $8,889,760.00 in the filing.

What prior sales by Joel Reiss are reported in the TransDigm (TDG) Form 144?

The filing reports two recent Rule 10b5‑1 sales: 3,900 shares of TransDigm common stock sold on August 17, 2026 for $4,831,152.30, and 3,900 shares sold on July 15, 2026 for $4,749,372.42.

How will the securities in this TransDigm (TDG) Form 144 be acquired?

The securities will be acquired through the exercise of stock options. The remarks state that the securities "were and will be received upon the exercise of stock options" and that the dates of acquisition and payment are the dates of exercise/sale.

Is the TransDigm (TDG) Form 144 tied to a 10b5-1 trading plan?

The notice itself covers 8,000 shares to be sold from option exercises, while the filing separately lists 10b5‑1 sales for Joel B. Reiss in the past three months, including the July 15 and August 17, 2026 transactions.

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

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Available on EDGAR 09/15/2026 - 04:48 PM Accepted by SEC EDGAR 09/15/2026 - 04:48 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001656109
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	TransDigm Group Incorporated
SEC File Number	001-32833
Address of Issuer	1350 Euclid Avenue, Suite 1600 Cleveland OHIO 44115
Phone	2167062960
Name of Person for Whose Account the Securities are To Be Sold	JOEL REISS
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	8000	8889760.00	55276525	09/15/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/15/2026	Exercise of Stock Options	Issuer			8000	09/15/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for JOEL B REISS 1350 Euclid Avenue, Suite 1600 Cleveland OH 44115	Common	08/17/2026	3900	4831152.30
10b5-1 Sales for JOEL B REISS 1350 Euclid Avenue, Suite 1600 Cleveland OH 44115	Common	07/15/2026	3900	4749372.42

144: Remarks and Signature

Remarks	The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale.
Date of Notice	09/15/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	08/12/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Joel Reiss
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)