REGENERON PHARMACEUTICALS

Ticker: REGN CUSIP: 75886F107 Class: COM

RA CAPITAL MANAGEMENT, L.P.'s Holding History (CIK: 0001346824)

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

Q2 2015

Shares 2,450 Value ($000) $1,250 Avg Close $485.93 Range $431.08 - $541.00

Q1 2015

Shares 2,450 Value ($000) $1,106 Avg Close $421.46 Range $390.83 - $492.77

Q4 2014

Shares 2,450 Value ($000) $1,005 Avg Close $391.09 Range $318.29 - $435.23

Q3 2014

Shares 2,450 Value ($000) $883 Avg Close $333.32 Range $283.49 - $367.27

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2015	2,450	$1,250	$485.93	$431.08 - $541.00
Q1 2015	2,450	$1,106	$421.46	$390.83 - $492.77
Q4 2014	2,450	$1,005	$391.09	$318.29 - $435.23
Q3 2014	2,450	$883	$333.32	$283.49 - $367.27