PROTEOSTASIS THERAPEUTICS IN

CUSIP: 74373B109 Class: COM

OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AM's Holding History (CIK: 0001132716)

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

Q4 2018
Shares 80,903 Value ($000) $262,000 Avg Close — Range —
Q4 2017
Shares 118,000 Value ($000) $688,000 Avg Close — Range —
Q1 2016
Shares 13,016 Value ($000) $125,000 Avg Close — Range —