PROTEOSTASIS THERAPEUTICS IN

CUSIP: 74373B109 Class: COM

ESSEX INVESTMENT MANAGEMENT CO LLC's Holding History (CIK: 0000201772)

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

Q3 2018
Shares 96,900 Value ($000) $234 Avg Close — Range —
Q2 2018
Shares 96,900 Value ($000) $270 Avg Close — Range —
Q1 2018
Shares 96,900 Value ($000) $460 Avg Close — Range —