NORTHWEST NAT GAS CO

CUSIP: 667655104 Class: COM

DUFF & PHELPS INVESTMENT MANAGEMENT CO's Holding History (CIK: 0000765443)

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

Q3 2018
Shares 800,000 Value ($000) $53,520 Avg Close — Range —
Q2 2018
Shares 800,000 Value ($000) $51,040 Avg Close — Range —
Q1 2018
Shares 800,000 Value ($000) $46,120 Avg Close — Range —
Q4 2017
Shares 800,000 Value ($000) $47,720 Avg Close — Range —
Q3 2017
Shares 800,000 Value ($000) $51,520 Avg Close — Range —
Q2 2017
Shares 800,000 Value ($000) $47,880 Avg Close — Range —
Q1 2017
Shares 800,000 Value ($000) $47,280 Avg Close — Range —
Q4 2016
Shares 800,000 Value ($000) $47,840 Avg Close — Range —
Q3 2016
Shares 800,000 Value ($000) $48,088 Avg Close — Range —
Q2 2016
Shares 800,000 Value ($000) $51,856 Avg Close — Range —
Q1 2016
Shares 800,000 Value ($000) $43,080 Avg Close — Range —
Q4 2015
Shares 800,000 Value ($000) $40,488 Avg Close — Range —
Q3 2015
Shares 800,000 Value ($000) $36,672 Avg Close — Range —
Q2 2015
Shares 800,000 Value ($000) $33,744 Avg Close — Range —
Q1 2015
Shares 800,000 Value ($000) $38,360 Avg Close — Range —
Q4 2014
Shares 800,000 Value ($000) $39,920 Avg Close — Range —
Q3 2014
Shares 800,000 Value ($000) $33,800 Avg Close — Range —
Q2 2014
Shares 800,000 Value ($000) $37,720 Avg Close — Range —
Q1 2014
Shares 800,000 Value ($000) $35,208 Avg Close — Range —
Q4 2013
Shares 800,000 Value ($000) $34,256 Avg Close — Range —
Q3 2013
Shares 800,000 Value ($000) $33,584 Avg Close — Range —
Q2 2013
Shares 841,260 Value ($000) $35,737 Avg Close — Range —