PROTEOSTASIS THERAPEUTICS IN

CUSIP: 74373B109 Class: COM

ALLIANCEBERNSTEIN L.P.'s Holding History (CIK: 0001109448)

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

Q4 2018
Shares 21,400 Value ($000) $69 Avg Close — Range —
Q3 2018
Shares 21,400 Value ($000) $52 Avg Close — Range —
Q2 2018
Shares 21,400 Value ($000) $60 Avg Close — Range —