PTC THERAPEUTICS INC

Ticker: PTCT CUSIP: 69366J200 Class: Common Stock

EMERALD ADVISERS, LLC's Holding History (CIK: 0001015083)

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

Q1 2020

Shares 147,280 Value ($000) $6,570 Avg Close $50.35 Range $30.79 - $59.89

Q4 2019

Shares 379,788 Value ($000) $18,241 Avg Close $42.49 Range $31.49 - $50.96

Q3 2019

Shares 371,908 Value ($000) $12,578 Avg Close $43.52 Range $33.05 - $48.81

Q2 2019

Shares 388,010 Value ($000) $17,460 Avg Close $39.49 Range $34.51 - $45.00

Q1 2019

Shares 299,431 Value ($000) $11,271 Avg Close $33.58 Range $27.53 - $39.67

Q4 2018

Shares 221,503 Value ($000) $7,602 Avg Close $35.96 Range $28.91 - $48.99

Q3 2018

Shares 225,450 Value ($000) $10,596 Avg Close $41.38 Range $32.13 - $48.85

Q4 2015

Shares 137,524 Value ($000) $4,456 Avg Close $29.43 Range $22.67 - $35.76

Q3 2015

Shares 22,514 Value ($000) $601 Avg Close $42.77 Range $24.63 - $62.15

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2020	147,280	$6,570	$50.35	$30.79 - $59.89
Q4 2019	379,788	$18,241	$42.49	$31.49 - $50.96
Q3 2019	371,908	$12,578	$43.52	$33.05 - $48.81
Q2 2019	388,010	$17,460	$39.49	$34.51 - $45.00
Q1 2019	299,431	$11,271	$33.58	$27.53 - $39.67
Q4 2018	221,503	$7,602	$35.96	$28.91 - $48.99
Q3 2018	225,450	$10,596	$41.38	$32.13 - $48.85
Q4 2015	137,524	$4,456	$29.43	$22.67 - $35.76
Q3 2015	22,514	$601	$42.77	$24.63 - $62.15