NATIONAL GRID PLC

CUSIP: 636274300 Class: SPONSORED ADR NE

American Investment Services, Inc.'s Holding History (CIK: 0001369913)

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

Q3 2015
Shares 22,399 Value ($000) $1,560 Avg Close — Range —
Q2 2015
Shares 20,878 Value ($000) $1,348 Avg Close — Range —
Q1 2015
Shares 22,254 Value ($000) $1,438 Avg Close — Range —
Q4 2014
Shares 22,254 Value ($000) $1,572 Avg Close — Range —
Q3 2014
Shares 21,544 Value ($000) $1,549 Avg Close — Range —
Q2 2014
Shares 21,544 Value ($000) $1,602 Avg Close — Range —
Q1 2014
Shares 48,928 Value ($000) $3,363 Avg Close — Range —
Q4 2013
Shares 47,145 Value ($000) $3,080 Avg Close — Range —
Q3 2013
Shares 47,145 Value ($000) $2,784 Avg Close — Range —
Q2 2013
Shares 40,662 Value ($000) $2,304 Avg Close — Range —