STOCK TITAN
  1. Home
  2. Sec-filings
  3. TDG
  4. [Form 4] TransDigm Group INC Insider Trading Activity

TransDigm Group (NYSE: TDG) director discloses notable insider stock sales

Filing Impact
(Very High)
Filing Sentiment
(Very Negative)
Form Type
4

Rhea-AI Filing Summary

TransDigm Group director Robert J. Small reported sales of the company’s common stock in a Form 4 filing. On 12/09/2025, entities associated with him sold 75,673 and 15,280 shares of TransDigm common stock at $1,335.72 per share.

After these transactions, 366,141 shares are held indirectly through Stockbridge Fund, L.P., 68,139 shares through Stockbridge Partners LLC, and 60,246 shares through certain family trusts, with an additional 5,625 shares held directly. The filing states that Small may be deemed to share voting and dispositive power over these holdings but disclaims beneficial ownership beyond any pecuniary interest.

Positive

  • None.

Negative

  • None.
Insider SMALL ROBERT J
Role Director
Sold 90,953 shs ($121.49M)
Type Security Shares Price Value
Sale Common Stock 75,673 $1,335.72 $101.08M
Sale Common Stock 15,280 $1,335.72 $20.41M
holding Common Stock -- -- --
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 366,141 shares (Indirect, By Stockbridge Fund, L.P.); Common Stock — 5,625 shares (Direct)
Footnotes (1)
  1. Represents shares held by Stockbridge Fund, L.P. ("SF"). Berkshire Partners Holdings LLC ("BPH") is the general partner of BPSP, L.P. ("BPSP"), which is the managing member of SP, the registered investment adviser to SF. Stockbridge Associates LLC ("SA") is the general partner of SF. The Reporting Person is a managing member of each of BPH, BPSP, SP and SA. As such, the Reporting Person may be deemed to share voting and dispositive power with respect to the shares of the Issuer's common stock held by SF. However, the Reporting Person disclaims beneficial ownership of these shares, except to the extent, if any, of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes. Represents shares held by Stockbridge Partners LLC ("SP") on behalf of a managed account over which it has shared voting and sole dispositive power. This Form 4 has been filed because the Reporting Person is a director of the Issuer and a managing member of SP. As such, the Reporting Person may be deemed to share voting and dispositive power with respect to the shares of the Issuer's common stock held by SP. However, the Reporting Person disclaims beneficial ownership of these shares, except to the extent, if any, of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes. Represents shares of Common Stock beneficially owned by certain family trusts. The Reporting Person's immediate family members are beneficiaries of such family trusts.
Form 4 Insider Transactions: What Each Field Means →
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).
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*
SMALL ROBERT J
(Last) (First) (Middle)
C/O BERKSHIRE PARTNERS LLC
200 CLARENDON STREET, 35TH FLOOR
(Street)
BOSTON MA 02116
(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
TransDigm Group INC [ TDG ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director 10% Owner
Officer (give title below) Other (specify below)
3. Date of Earliest Transaction (Month/Day/Year)
12/09/2025
4. If Amendment, Date of Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
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
Common Stock 12/09/2025 S 75,673 D $1,335.72 366,141 I By Stockbridge Fund, L.P.(1)
Common Stock 12/09/2025 S 15,280 D $1,335.72 68,139 I By Stockbridge Partners LLC(2)
Common Stock 60,246 I By Family Trusts(3)
Common Stock 5,625 D
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
Explanation of Responses:
1. Represents shares held by Stockbridge Fund, L.P. ("SF"). Berkshire Partners Holdings LLC ("BPH") is the general partner of BPSP, L.P. ("BPSP"), which is the managing member of SP, the registered investment adviser to SF. Stockbridge Associates LLC ("SA") is the general partner of SF. The Reporting Person is a managing member of each of BPH, BPSP, SP and SA. As such, the Reporting Person may be deemed to share voting and dispositive power with respect to the shares of the Issuer's common stock held by SF. However, the Reporting Person disclaims beneficial ownership of these shares, except to the extent, if any, of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.
2. Represents shares held by Stockbridge Partners LLC ("SP") on behalf of a managed account over which it has shared voting and sole dispositive power. This Form 4 has been filed because the Reporting Person is a director of the Issuer and a managing member of SP. As such, the Reporting Person may be deemed to share voting and dispositive power with respect to the shares of the Issuer's common stock held by SP. However, the Reporting Person disclaims beneficial ownership of these shares, except to the extent, if any, of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.
3. Represents shares of Common Stock beneficially owned by certain family trusts. The Reporting Person's immediate family members are beneficiaries of such family trusts.
/s/ Robert J. Small 12/09/2025
** 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.

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did TransDigm Group (TDG) disclose in this Form 4?

The Form 4 reports that director Robert J. Small had affiliated entities sell 75,673 and 15,280 shares of TransDigm Group common stock on 12/09/2025 at $1,335.72 per share.

How many TransDigm (TDG) shares does Robert J. Small report beneficially owning after the transactions?

After the reported sales, the filing shows 366,141 shares held via Stockbridge Fund, L.P., 68,139 via Stockbridge Partners LLC, 60,246 via certain family trusts, and 5,625 shares held directly.

What is the relationship of Robert J. Small to TransDigm Group (TDG)?

The filing lists Robert J. Small’s relationship to TransDigm Group as a director of the issuer.

Does Robert J. Small claim full beneficial ownership of all reported TransDigm (TDG) shares?

No. The filing states he may be deemed to share voting and dispositive power over shares held by investment funds and a managed account but disclaims beneficial ownership except to the extent of any pecuniary interest.

Which entities hold TransDigm (TDG) shares linked to Robert J. Small?

Reported holdings are through Stockbridge Fund, L.P., Stockbridge Partners LLC, and certain family trusts, in addition to shares held directly by Robert J. Small.

At what price were the reported TransDigm (TDG) stock sales executed?

The sales of TransDigm common stock reported in the Form 4 were executed at a price of $1,335.72 per share.