NORTHWEST NAT GAS CO

CUSIP: 667655104 Class: COM

BOKF, NA's Holding History (CIK: 0000009634)

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

Q1 2015
Shares 530 Value ($000) $25 Avg Close — Range —
Q3 2014
Shares 490 Value ($000) $20 Avg Close — Range —
Q2 2014
Shares 4,423 Value ($000) $209 Avg Close — Range —