NORTHWEST NAT GAS CO

CUSIP: 667655104 Class: COM

MARTINGALE ASSET MANAGEMENT L P's Holding History (CIK: 0000936944)

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

Q3 2018
Shares 40,807 Value ($000) $2,730 Avg Close — Range —
Q2 2018
Shares 61,108 Value ($000) $3,899 Avg Close — Range —
Q1 2018
Shares 77,608 Value ($000) $4,475 Avg Close — Range —
Q4 2017
Shares 81,408 Value ($000) $4,856 Avg Close — Range —
Q3 2017
Shares 91,908 Value ($000) $5,919 Avg Close — Range —
Q2 2017
Shares 91,808 Value ($000) $5,495 Avg Close — Range —
Q1 2017
Shares 91,508 Value ($000) $5,409 Avg Close — Range —
Q4 2016
Shares 95,408 Value ($000) $5,706 Avg Close — Range —
Q3 2016
Shares 103,318 Value ($000) $6,211 Avg Close — Range —
Q2 2016
Shares 43,665 Value ($000) $2,831 Avg Close — Range —
Q1 2016
Shares 18,008 Value ($000) $970 Avg Close — Range —
Q4 2015
Shares 18,008 Value ($000) $912 Avg Close — Range —
Q1 2015
Shares 19,108 Value ($000) $917 Avg Close — Range —
Q4 2014
Shares 19,808 Value ($000) $989 Avg Close — Range —
Q3 2014
Shares 19,908 Value ($000) $842 Avg Close — Range —