REGENERON PHARMACEUTICALS

Ticker: REGN CUSIP: 75886F107 Class: COM

CASTLEARK MANAGEMENT LLC's Holding History (CIK: 0001106832)

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

Q2 2015

Shares 2,500 Value ($000) $1,275 Avg Close $485.93 Range $431.08 - $541.00

Q3 2014

Shares 30,410 Value ($000) $9,132 Avg Close $333.32 Range $283.49 - $367.27

Q1 2014

Shares 30,410 Value ($000) $9,132 Avg Close $306.39 Range $261.52 - $350.55

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2015	2,500	$1,275	$485.93	$431.08 - $541.00
Q3 2014	30,410	$9,132	$333.32	$283.49 - $367.27
Q1 2014	30,410	$9,132	$306.39	$261.52 - $350.55