NORTHWEST NAT GAS CO

CUSIP: 667655104 Class: COM

WELLINGTON MANAGEMENT GROUP LLP's Holding History (CIK: 0000902219)

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

Q4 2017
Shares 5,267 Value ($000) $314 Avg Close — Range —
Q3 2017
Shares 5,267 Value ($000) $339 Avg Close — Range —