PROTEOSTASIS THERAPEUTICS IN

CUSIP: 74373B109 Class: COM

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

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

Q2 2020
Shares 10,249 Value ($000) $14 Avg Close — Range —
Q1 2020
Shares 48,486 Value ($000) $55 Avg Close — Range —
Q4 2019
Shares 205,736 Value ($000) $469 Avg Close — Range —
Q3 2019
Shares 13,745 Value ($000) $12 Avg Close — Range —
Q2 2019
Shares 45,602 Value ($000) $45 Avg Close — Range —
Q1 2019
Shares 153,993 Value ($000) $194 Avg Close — Range —