PROTEOSTASIS THERAPEUTICS IN

CUSIP: 74373B109 Class: COM

BLAIR WILLIAM & CO/IL's Holding History (CIK: 0000902367)

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

Q3 2020
Shares 16,555 Value ($000) $18 Avg Close — Range —
Q2 2020
Shares 30,055 Value ($000) $41 Avg Close — Range —
Q1 2020
Shares 20,425 Value ($000) $23 Avg Close — Range —