PTC THERAPEUTICS INC

Ticker: PTCT CUSIP: 69366J200 Class: Common Stock

Granahan Investment Management, LLC's Holding History (CIK: 0001026710)

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

Q4 2015

Shares 381,227 Value ($000) $12,352 Avg Close $29.43 Range $22.67 - $35.76

Q3 2015

Shares 236,100 Value ($000) $6,304 Avg Close $42.77 Range $24.63 - $62.15

Q2 2015

Shares 116,500 Value ($000) $5,607 Avg Close $58.34 Range $46.17 - $78.72

Q1 2015

Shares 105,000 Value ($000) $6,389 Avg Close $61.01 Range $46.91 - $77.87

Q4 2014

Shares 869,101 Value ($000) $44,993 Avg Close $44.02 Range $33.02 - $57.50

Q3 2014

Shares 879,602 Value ($000) $38,711 Avg Close $31.28 Range $22.70 - $47.20

Q2 2014

Shares 880,463 Value ($000) $23,015 Avg Close $21.40 Range $14.51 - $28.75

Q1 2014

Shares 901,423 Value ($000) $23,563 Avg Close $26.87 Range $16.21 - $34.65

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2015	381,227	$12,352	$29.43	$22.67 - $35.76
Q3 2015	236,100	$6,304	$42.77	$24.63 - $62.15
Q2 2015	116,500	$5,607	$58.34	$46.17 - $78.72
Q1 2015	105,000	$6,389	$61.01	$46.91 - $77.87
Q4 2014	869,101	$44,993	$44.02	$33.02 - $57.50
Q3 2014	879,602	$38,711	$31.28	$22.70 - $47.20
Q2 2014	880,463	$23,015	$21.40	$14.51 - $28.75
Q1 2014	901,423	$23,563	$26.87	$16.21 - $34.65