TRANSDIGM GROUP INC

Ticker: TDG CUSIP: 893641100 Class: COM

Port Capital LLC's Holding History (CIK: 0001729212)

Note: Option positions (PUT/CALL) are excluded.

Q1 2018

Shares 31,295 Value ($000) $9,606 Avg Close $218.67 Range $196.90 - $238.53

Q4 2017

Shares 31,000 Value ($000) $8,513 Avg Close $201.62 Range $189.22 - $211.95

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2018	31,295	$9,606	$218.67	$196.90 - $238.53
Q4 2017	31,000	$8,513	$201.62	$189.22 - $211.95