ICON PLC

Ticker: ICLR CUSIP: G4705A100 Class: SHS

Twin Tree Management, LP's Holding History (CIK: 0001535588)

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

Q1 2018

Shares 235 Value ($000) $28 Avg Close $114.70 Range $101.22 - $124.65

Q4 2017

Shares 3,308 Value ($000) $371 Avg Close $115.23 Range $110.54 - $124.48

Q4 2015

Shares 838 Value ($000) $65 Avg Close $71.41 Range $63.20 - $78.88

Q3 2015

Shares 1,701 Value ($000) $121 Avg Close $75.27 Range $64.27 - $84.14

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2018	235	$28	$114.70	$101.22 - $124.65
Q4 2017	3,308	$371	$115.23	$110.54 - $124.48
Q4 2015	838	$65	$71.41	$63.20 - $78.88
Q3 2015	1,701	$121	$75.27	$64.27 - $84.14