WESTAR ENERGY INC

CUSIP: 95709T100 Class: COMMON STOCK

Robeco Institutional Asset Management B.V.'s Holding History (CIK: 0001418773)

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

Q1 2018
Shares 15,753 Value ($000) $828 Avg Close — Range —
Q4 2017
Shares 9,414 Value ($000) $498 Avg Close — Range —
Q3 2017
Shares 1,876 Value ($000) $94 Avg Close — Range —
Q2 2017
Shares 160,587 Value ($000) $8,514 Avg Close — Range —
Q1 2017
Shares 299,244 Value ($000) $16,240 Avg Close — Range —
Q4 2016
Shares 316,128 Value ($000) $17,814 Avg Close — Range —
Q3 2016
Shares 318,984 Value ($000) $18,104 Avg Close — Range —
Q2 2016
Shares 318,984 Value ($000) $17,891 Avg Close — Range —
Q1 2016
Shares 302,100 Value ($000) $14,988 Avg Close — Range —
Q4 2015
Shares 302,100 Value ($000) $12,812 Avg Close — Range —
Q3 2015
Shares 315,263 Value ($000) $12,119 Avg Close — Range —
Q2 2015
Shares 315,263 Value ($000) $10,788 Avg Close — Range —
Q1 2015
Shares 320,622 Value ($000) $12,427 Avg Close — Range —
Q4 2014
Shares 328,494 Value ($000) $13,547 Avg Close — Range —
Q3 2014
Shares 129,105 Value ($000) $4,406 Avg Close — Range —
Q2 2014
Shares 38,317 Value ($000) $1,464 Avg Close — Range —
Q1 2014
Shares 38,317 Value ($000) $1,347 Avg Close — Range —
Q4 2013
Shares 464 Value ($000) $15 Avg Close — Range —