TRANSDIGM GROUP INC

Ticker: TDG CUSIP: 893641100 Class: COM

VIKING GLOBAL INVESTORS LP's Holding History (CIK: 0001103804)

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

Q1 2018

Shares 1,048,958 Value ($000) $321,967 Avg Close $218.67 Range $196.90 - $238.53

Q4 2017

Shares 575,317 Value ($000) $157,994 Avg Close $201.62 Range $189.22 - $211.95

Q2 2017

Shares 533,860 Value ($000) $143,539 Avg Close $173.41 Range $148.53 - $187.86

Q1 2016

Shares 1,101,310 Value ($000) $242,663 Avg Close $136.47 Range $112.97 - $145.25

Q4 2015

Shares 1,600,128 Value ($000) $365,549 Avg Close $140.66 Range $131.38 - $149.06

Q3 2015

Shares 1,138,974 Value ($000) $241,929 Avg Close $143.01 Range $130.21 - $153.05

Q2 2015

Shares 458,176 Value ($000) $102,938 Avg Close $140.09 Range $132.07 - $145.10

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2018	1,048,958	$321,967	$218.67	$196.90 - $238.53
Q4 2017	575,317	$157,994	$201.62	$189.22 - $211.95
Q2 2017	533,860	$143,539	$173.41	$148.53 - $187.86
Q1 2016	1,101,310	$242,663	$136.47	$112.97 - $145.25
Q4 2015	1,600,128	$365,549	$140.66	$131.38 - $149.06
Q3 2015	1,138,974	$241,929	$143.01	$130.21 - $153.05
Q2 2015	458,176	$102,938	$140.09	$132.07 - $145.10