Insider trade

Director sold ~$20.4M of TDG shares in the open market

Traded Dec 9, 2025 · Filed Dec 10, 2025

TransDigm GroupTDG

~$20.4M
Reported value · 15K sh @ $1,335.72: 68K
Holds after · shares reported: -16.8%
stock since the trade · S&P 500 +11.8%, $1,318.02 → $1,097.24 on Oct 1

Why it stands out

A board member of TransDigm Group sold $20.4M of TransDigm Group shares. Nobody planned it ahead of time.

Written from the filing's own figures. OQRO describes what was reported and never tells you what to buy or sell

View the official recordSEC Form 4 — Statement of Changes in Beneficial Ownership

All the details

Dates, kept separate

Transaction date: Dec 9, 2025
Reporting period: Not applicable
Filed with the SEC: Dec 10, 2025

DirectorIndirect holding$1M+

Context

Classification

open market sale

Code S — open-market or private sale

Absolute commitment

~$20,409,802

Shares × reported transaction price

Timing vs results

27 days after results of Nov 12, 2025, 56 days before results of Feb 3, 2026

Results dates are the company's own 8-K (Item 2.02). Many companies only let insiders trade in a window after results

Price at the time

Closed at $1,318.02 on Dec 9, 2025, 7% above its 52-week low and 19% below its high, after a 3% drop over the previous 30 trading days

52-week range $1,231.75 (Apr 8, 2025) to $1,620.83 (Jul 30, 2025), 22% of the way up, from 250 adjusted closes. 30 trading days earlier: $1,354.46 on Oct 27, 2025. Describes the past only, not a forecast

Planned / mechanical clue

None found in footnotes

Only flagged when a footnote says so; never inferred

After it was reported

After	Stock	S&P 500	Difference
7 days	-3.2%	-2.4%	-0.8%
30 days	+6.8%	+0.9%	+5.9%
90 days	-2.6%	-1.5%	-1.1%
180 days	-7.4%	+7.5%	-14.9%

Past results only. Not a forecast.

Source receipt

Record ID: 0000919574-25-007305
Filed / recorded: Dec 10, 2025, 2:09 AM UTC
Added to OQRO: Oct 2, 2026, 12:28 PM UTC
Parser: form4-xml-v1
Data quality: Verified: identifiers matched exactly
Issuer: TransDigm Group INC
Issuer CIK: 1260221
Ticker: TDG
Reporting person: Robert J Small
Relationship: Director
Security: Common Stock
Table: Non-derivative (Table I)
Transaction date: Dec 9, 2025
Transaction code: S
Shares / units: 15,280
Price per share: $1,335.72
Acquired / disposed: Disposed (D)
Shares owned after: 68,139
Ownership form: Indirect — By Stockbridge Partners LLC
Amendment: No

Footnotes from the filing

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.