WESTERN GAS EQUITY PARTNERS

CUSIP: 95825R103 Class: CMN

CASTLEARK MANAGEMENT LLC's Holding History (CIK: 0001106832)

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

Q4 2015
Shares 23,480 Value ($000) $852 Avg Close — Range —
Q3 2015
Shares 43,680 Value ($000) $1,722 Avg Close — Range —
Q2 2015
Shares 74,780 Value ($000) $4,487 Avg Close — Range —
Q1 2015
Shares 95,230 Value ($000) $5,714 Avg Close — Range —
Q4 2014
Shares 81,060 Value ($000) $4,882 Avg Close — Range —
Q3 2014
Shares 89,600 Value ($000) $4,400 Avg Close — Range —
Q2 2014
Shares 89,600 Value ($000) $5,618 Avg Close — Range —
Q1 2014
Shares 89,600 Value ($000) $4,400 Avg Close — Range —
Q4 2013
Shares 89,600 Value ($000) $3,540 Avg Close — Range —
Q3 2013
Shares 89,600 Value ($000) $5,460 Avg Close — Range —
Q2 2013
Shares 77,900 Value ($000) $3,207 Avg Close — Range —