DATALINK CORP

CUSIP: 237934104 Class: COMMON STOCK

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

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

Q2 2016
Shares 500 Value ($000) $4 Avg Close — Range —
Q3 2015
Shares 2,754 Value ($000) $16 Avg Close — Range —
Q3 2013
Shares 3,145 Value ($000) $43 Avg Close — Range —