PTC THERAPEUTICS INC

Ticker: PTCT CUSIP: 69366J200 Class: Common Stock

Cormorant Asset Management, LP's Holding History (CIK: 0001583977)

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

Q1 2015

Shares 8,500 Value ($000) $517 Avg Close $61.01 Range $46.91 - $77.87

Q4 2014

Shares 10,000 Value ($000) $518 Avg Close $44.02 Range $33.02 - $57.50

Q3 2014

Shares 125,000 Value ($000) $5,501 Avg Close $31.28 Range $22.70 - $47.20

Q2 2014

Shares 150,000 Value ($000) $3,921 Avg Close $21.40 Range $14.51 - $28.75

Q1 2014

Shares 550,000 Value ($000) $14,377 Avg Close $26.87 Range $16.21 - $34.65

Q4 2013

Shares 28,800 Value ($000) $489 Avg Close $17.58 Range $13.15 - $22.42

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2015	8,500	$517	$61.01	$46.91 - $77.87
Q4 2014	10,000	$518	$44.02	$33.02 - $57.50
Q3 2014	125,000	$5,501	$31.28	$22.70 - $47.20
Q2 2014	150,000	$3,921	$21.40	$14.51 - $28.75
Q1 2014	550,000	$14,377	$26.87	$16.21 - $34.65
Q4 2013	28,800	$489	$17.58	$13.15 - $22.42