NORTHWESTERN CORP

Ticker: NWE CUSIP: 668074305 Class: EQTY

MASON STREET ADVISORS, LLC's Holding History (CIK: 0001167711)

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

Q4 2020

Shares 27,014 Value ($000) $1,575 Avg Close $43.87 Range $37.97 - $49.46

Q3 2020

Shares 27,069 Value ($000) $1,317 Avg Close $41.40 Range $37.35 - $45.52

Q2 2020

Shares 27,671 Value ($000) $1,509 Avg Close $44.67 Range $39.68 - $50.33

Q1 2020

Shares 26,832 Value ($000) $1,605 Avg Close $54.52 Range $34.68 - $61.46

Q4 2019

Shares 26,832 Value ($000) $1,923 Avg Close $54.65 Range $51.50 - $57.67

Q3 2019

Shares 26,453 Value ($000) $1,985 Avg Close $54.27 Range $50.60 - $58.08

Q2 2019

Shares 26,886 Value ($000) $1,940 Avg Close $53.01 Range $50.21 - $55.53

Q1 2019

Shares 26,774 Value ($000) $1,885 Avg Close $48.59 Range $42.38 - $53.49

Q4 2018

Shares 26,358 Value ($000) $1,567 Avg Close $45.03 Range $41.21 - $48.18

Q3 2018

Shares 25,843 Value ($000) $1,516 Avg Close $43.15 Range $40.65 - $45.13

Q2 2018

Shares 25,375 Value ($000) $1,453 Avg Close $39.06 Range $37.03 - $41.93

Q1 2018

Shares 24,810 Value ($000) $1,335 Avg Close $37.69 Range $35.55 - $42.53

Q4 2017

Shares 23,941 Value ($000) $1,429 Avg Close $42.54 Range $39.78 - $45.45

Q3 2017

Shares 24,058 Value ($000) $1,370 Avg Close $41.74 Range $40.09 - $43.18

Q2 2017

Shares 23,665 Value ($000) $1,444 Avg Close $42.35 Range $40.29 - $44.62

Q1 2017

Shares 22,843 Value ($000) $1,341 Avg Close $39.52 Range $38.19 - $41.05

Q4 2016

Shares 22,556 Value ($000) $1,283 Avg Close $38.33 Range $36.64 - $40.23

Q2 2016

Shares 9,422 Value ($000) $594 Avg Close $39.68 Range $37.02 - $42.70

Q1 2016

Shares 8,564 Value ($000) $529 Avg Close $38.33 Range $34.60 - $41.62

Q4 2015

Shares 7,763 Value ($000) $421 Avg Close $35.84 Range $33.71 - $37.52

Q3 2015

Shares 6,934 Value ($000) $373 Avg Close $34.01 Range $31.66 - $36.90

Q2 2015

Shares 6,498 Value ($000) $317 Avg Close $33.40 Range $31.54 - $35.25

Q1 2015

Shares 6,246 Value ($000) $336 Avg Close $35.30 Range $32.73 - $38.16

Q4 2014

Shares 130,172 Value ($000) $7,365 Avg Close $33.16 Range $28.63 - $37.51

Q3 2014

Shares 114,944 Value ($000) $5,214 Avg Close $30.29 Range $28.46 - $33.15

Q2 2014

Shares 115,584 Value ($000) $6,003 Avg Close $30.04 Range $28.38 - $33.02

Q1 2014

Shares 113,004 Value ($000) $5,360 Avg Close $27.98 Range $26.36 - $29.86

Q4 2013

Shares 113,148 Value ($000) $4,902 Avg Close $27.40 Range $25.54 - $28.91

Q3 2013

Shares 5,654 Value ($000) $254 Avg Close $25.46 Range $23.73 - $28.10

Q2 2013

Shares 5,249 Value ($000) $209 Avg Close $24.78 Range $23.14 - $25.97

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2020	27,014	$1,575	$43.87	$37.97 - $49.46
Q3 2020	27,069	$1,317	$41.40	$37.35 - $45.52
Q2 2020	27,671	$1,509	$44.67	$39.68 - $50.33
Q1 2020	26,832	$1,605	$54.52	$34.68 - $61.46
Q4 2019	26,832	$1,923	$54.65	$51.50 - $57.67
Q3 2019	26,453	$1,985	$54.27	$50.60 - $58.08
Q2 2019	26,886	$1,940	$53.01	$50.21 - $55.53
Q1 2019	26,774	$1,885	$48.59	$42.38 - $53.49
Q4 2018	26,358	$1,567	$45.03	$41.21 - $48.18
Q3 2018	25,843	$1,516	$43.15	$40.65 - $45.13
Q2 2018	25,375	$1,453	$39.06	$37.03 - $41.93
Q1 2018	24,810	$1,335	$37.69	$35.55 - $42.53
Q4 2017	23,941	$1,429	$42.54	$39.78 - $45.45
Q3 2017	24,058	$1,370	$41.74	$40.09 - $43.18
Q2 2017	23,665	$1,444	$42.35	$40.29 - $44.62
Q1 2017	22,843	$1,341	$39.52	$38.19 - $41.05
Q4 2016	22,556	$1,283	$38.33	$36.64 - $40.23
Q2 2016	9,422	$594	$39.68	$37.02 - $42.70
Q1 2016	8,564	$529	$38.33	$34.60 - $41.62
Q4 2015	7,763	$421	$35.84	$33.71 - $37.52
Q3 2015	6,934	$373	$34.01	$31.66 - $36.90
Q2 2015	6,498	$317	$33.40	$31.54 - $35.25
Q1 2015	6,246	$336	$35.30	$32.73 - $38.16
Q4 2014	130,172	$7,365	$33.16	$28.63 - $37.51
Q3 2014	114,944	$5,214	$30.29	$28.46 - $33.15
Q2 2014	115,584	$6,003	$30.04	$28.38 - $33.02
Q1 2014	113,004	$5,360	$27.98	$26.36 - $29.86
Q4 2013	113,148	$4,902	$27.40	$25.54 - $28.91
Q3 2013	5,654	$254	$25.46	$23.73 - $28.10
Q2 2013	5,249	$209	$24.78	$23.14 - $25.97