NORTHWEST NAT GAS CO

CUSIP: 667655104 Class: COM

DIMENSIONAL FUND ADVISORS LP's Holding History (CIK: 0000354204)

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

Q3 2018
Shares 893,207 Value ($000) $59,755 Avg Close — Range —
Q2 2018
Shares 891,145 Value ($000) $56,856 Avg Close — Range —
Q1 2018
Shares 888,223 Value ($000) $51,206 Avg Close — Range —
Q4 2017
Shares 884,054 Value ($000) $52,734 Avg Close — Range —
Q3 2017
Shares 876,327 Value ($000) $56,436 Avg Close — Range —
Q2 2017
Shares 861,985 Value ($000) $51,590 Avg Close — Range —
Q1 2017
Shares 850,548 Value ($000) $50,267 Avg Close — Range —
Q4 2016
Shares 847,350 Value ($000) $50,672 Avg Close — Range —
Q3 2016
Shares 843,863 Value ($000) $50,725 Avg Close — Range —
Q2 2016
Shares 838,330 Value ($000) $54,339 Avg Close — Range —
Q1 2016
Shares 815,373 Value ($000) $43,908 Avg Close — Range —
Q4 2015
Shares 731,996 Value ($000) $37,047 Avg Close — Range —
Q3 2015
Shares 685,578 Value ($000) $31,426 Avg Close — Range —
Q2 2015
Shares 660,915 Value ($000) $27,878 Avg Close — Range —
Q1 2015
Shares 622,902 Value ($000) $29,868 Avg Close — Range —
Q4 2014
Shares 571,923 Value ($000) $28,540 Avg Close — Range —
Q3 2014
Shares 544,002 Value ($000) $22,985 Avg Close — Range —
Q2 2014
Shares 499,349 Value ($000) $23,544 Avg Close — Range —
Q1 2014
Shares 417,901 Value ($000) $18,392 Avg Close — Range —
Q4 2013
Shares 347,560 Value ($000) $14,883 Avg Close — Range —
Q3 2013
Shares 313,949 Value ($000) $13,179 Avg Close — Range —
Q2 2013
Shares 327,055 Value ($000) $13,893 Avg Close — Range —