PTC THERAPEUTICS INC

Ticker: PTCT CUSIP: 69366J200 Class: Common Stock

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

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

Q2 2015

Shares 25,800 Value ($000) $1,242 Avg Close $58.34 Range $46.17 - $78.72

Q1 2015

Shares 25,800 Value ($000) $1,570 Avg Close $61.01 Range $46.91 - $77.87

Q4 2014

Shares 25,800 Value ($000) $1,336 Avg Close $44.02 Range $33.02 - $57.50

Q3 2014

Shares 25,800 Value ($000) $1,135 Avg Close $31.28 Range $22.70 - $47.20

Q1 2014

Shares 981,761 Value ($000) $25,663 Avg Close $26.87 Range $16.21 - $34.65

Q4 2013

Shares 752,438 Value ($000) $12,769 Avg Close $17.58 Range $13.15 - $22.42

Q3 2013

Shares 300,000 Value ($000) $6,438 Avg Close $17.38 Range $13.88 - $24.38

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2015	25,800	$1,242	$58.34	$46.17 - $78.72
Q1 2015	25,800	$1,570	$61.01	$46.91 - $77.87
Q4 2014	25,800	$1,336	$44.02	$33.02 - $57.50
Q3 2014	25,800	$1,135	$31.28	$22.70 - $47.20
Q1 2014	981,761	$25,663	$26.87	$16.21 - $34.65
Q4 2013	752,438	$12,769	$17.58	$13.15 - $22.42
Q3 2013	300,000	$6,438	$17.38	$13.88 - $24.38