TETRAPHASE PHARMACEUTICALS I

CUSIP: 88165N105 Class: COMMON STOCK

GAMCO INVESTORS, INC. ET AL's Holding History (CIK: 0000807249)

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

Q2 2019
Shares 50,000 Value ($000) $24 Avg Close — Range —
Q1 2019
Shares 50,000 Value ($000) $67 Avg Close — Range —
Q4 2018
Shares 50,000 Value ($000) $57 Avg Close — Range —
Q3 2018
Shares 35,000 Value ($000) $97 Avg Close — Range —
Q2 2018
Shares 35,000 Value ($000) $125 Avg Close — Range —
Q1 2018
Shares 30,000 Value ($000) $92 Avg Close — Range —