ZOGENIX INC

CUSIP: 98978L204 Class: COM NEW

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

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

Q4 2021
Shares 101,933 Value ($000) $1,656 Avg Close — Range —
Q3 2021
Shares 66,365 Value ($000) $1,008 Avg Close — Range —
Q2 2021
Shares 12,087 Value ($000) $209 Avg Close — Range —
Q1 2021
Shares 18,261 Value ($000) $356 Avg Close — Range —
Q3 2019
Shares 9,969 Value ($000) $399 Avg Close — Range —
Q1 2018
Shares 2,323 Value ($000) $93 Avg Close — Range —
Q3 2017
Shares 164,948 Value ($000) $5,781 Avg Close — Range —
Q2 2017
Shares 50,074 Value ($000) $726 Avg Close — Range —
Q1 2017
Shares 34,363 Value ($000) $373 Avg Close — Range —
Q4 2016
Shares 57,894 Value ($000) $703 Avg Close — Range —
Q3 2016
Shares 37,246 Value ($000) $426 Avg Close — Range —
Q2 2016
Shares 32,446 Value ($000) $261 Avg Close — Range —
Q1 2016
Shares 43,946 Value ($000) $406 Avg Close — Range —