MONOLITHIC PWR SYS INC

Ticker: MPWR CUSIP: 609839105 Class: COM

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

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

Q4 2020

Shares 22,640 Value ($000) $8,291 Avg Close $308.64 Range $261.69 - $353.99

Q3 2020

Shares 22,596 Value ($000) $6,318 Avg Close $250.15 Range $223.49 - $273.49

Q2 2020

Shares 22,801 Value ($000) $5,404 Avg Close $194.18 Range $144.85 - $229.19

Q1 2020

Shares 21,487 Value ($000) $3,598 Avg Close $163.85 Range $124.42 - $184.64

Q4 2019

Shares 21,487 Value ($000) $3,825 Avg Close $152.39 Range $125.11 - $175.03

Q3 2019

Shares 21,091 Value ($000) $3,282 Avg Close $142.31 Range $127.77 - $155.32

Q2 2019

Shares 21,114 Value ($000) $2,867 Avg Close $129.05 Range $108.95 - $152.95

Q1 2019

Shares 20,996 Value ($000) $2,845 Avg Close $124.16 Range $101.64 - $137.81

Q4 2018

Shares 20,438 Value ($000) $2,376 Avg Close $112.91 Range $96.22 - $130.06

Q3 2018

Shares 19,988 Value ($000) $2,509 Avg Close $131.20 Range $117.51 - $143.26

Q2 2018

Shares 19,906 Value ($000) $2,661 Avg Close $119.62 Range $102.58 - $133.88

Q1 2018

Shares 19,468 Value ($000) $2,254 Avg Close $111.03 Range $96.61 - $119.53

Q4 2017

Shares 18,818 Value ($000) $2,114 Avg Close $108.54 Range $98.18 - $118.56

Q3 2017

Shares 18,897 Value ($000) $2,013 Avg Close $94.77 Range $87.95 - $100.67

Q2 2017

Shares 18,545 Value ($000) $1,788 Avg Close $88.76 Range $82.13 - $96.78

Q1 2017

Shares 17,894 Value ($000) $1,648 Avg Close $82.35 Range $76.05 - $87.81

Q4 2016

Shares 17,465 Value ($000) $1,431 Avg Close $74.44 Range $69.57 - $81.67

Q2 2016

Shares 7,246 Value ($000) $495 Avg Close $60.38 Range $55.33 - $65.50

Q1 2016

Shares 6,574 Value ($000) $418 Avg Close $54.76 Range $50.58 - $59.11

Q4 2015

Shares 5,860 Value ($000) $373 Avg Close $56.88 Range $45.12 - $63.43

Q3 2015

Shares 5,368 Value ($000) $275 Avg Close $45.23 Range $37.18 - $48.10

Q2 2015

Shares 5,078 Value ($000) $258 Avg Close $48.11 Range $44.76 - $50.50

Q1 2015

Shares 4,795 Value ($000) $252 Avg Close $45.64 Range $40.76 - $50.87

Q4 2014

Shares 4,635 Value ($000) $231 Avg Close $40.54 Range $30.68 - $45.83

Q3 2014

Shares 4,494 Value ($000) $198 Avg Close $39.57 Range $36.40 - $43.40

Q2 2014

Shares 4,416 Value ($000) $187 Avg Close $34.76 Range $31.35 - $38.50

Q1 2014

Shares 4,299 Value ($000) $167 Avg Close $31.60 Range $27.60 - $35.10

Q4 2013

Shares 5,530 Value ($000) $192 Avg Close $28.65 Range $24.43 - $31.16

Q3 2013

Shares 5,035 Value ($000) $152 Avg Close $25.18 Range $21.26 - $28.18

Q2 2013

Shares 4,535 Value ($000) $109 Avg Close $21.28 Range $18.50 - $22.86

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2020	22,640	$8,291	$308.64	$261.69 - $353.99
Q3 2020	22,596	$6,318	$250.15	$223.49 - $273.49
Q2 2020	22,801	$5,404	$194.18	$144.85 - $229.19
Q1 2020	21,487	$3,598	$163.85	$124.42 - $184.64
Q4 2019	21,487	$3,825	$152.39	$125.11 - $175.03
Q3 2019	21,091	$3,282	$142.31	$127.77 - $155.32
Q2 2019	21,114	$2,867	$129.05	$108.95 - $152.95
Q1 2019	20,996	$2,845	$124.16	$101.64 - $137.81
Q4 2018	20,438	$2,376	$112.91	$96.22 - $130.06
Q3 2018	19,988	$2,509	$131.20	$117.51 - $143.26
Q2 2018	19,906	$2,661	$119.62	$102.58 - $133.88
Q1 2018	19,468	$2,254	$111.03	$96.61 - $119.53
Q4 2017	18,818	$2,114	$108.54	$98.18 - $118.56
Q3 2017	18,897	$2,013	$94.77	$87.95 - $100.67
Q2 2017	18,545	$1,788	$88.76	$82.13 - $96.78
Q1 2017	17,894	$1,648	$82.35	$76.05 - $87.81
Q4 2016	17,465	$1,431	$74.44	$69.57 - $81.67
Q2 2016	7,246	$495	$60.38	$55.33 - $65.50
Q1 2016	6,574	$418	$54.76	$50.58 - $59.11
Q4 2015	5,860	$373	$56.88	$45.12 - $63.43
Q3 2015	5,368	$275	$45.23	$37.18 - $48.10
Q2 2015	5,078	$258	$48.11	$44.76 - $50.50
Q1 2015	4,795	$252	$45.64	$40.76 - $50.87
Q4 2014	4,635	$231	$40.54	$30.68 - $45.83
Q3 2014	4,494	$198	$39.57	$36.40 - $43.40
Q2 2014	4,416	$187	$34.76	$31.35 - $38.50
Q1 2014	4,299	$167	$31.60	$27.60 - $35.10
Q4 2013	5,530	$192	$28.65	$24.43 - $31.16
Q3 2013	5,035	$152	$25.18	$21.26 - $28.18
Q2 2013	4,535	$109	$21.28	$18.50 - $22.86