MONOLITHIC PWR SYS INC

Ticker: MPWR CUSIP: 609839105 Class: COM

ALLIANCEBERNSTEIN L.P.'s Holding History (CIK: 0001109448)

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

Q4 2025

Shares 134,631 Value ($000) $122,024 Avg Close $960.73 Range $831.77 - $1121.48

Q3 2025

Shares 280,703 Value ($000) $258,426 Avg Close $808.07 Range $684.50 - $934.81

Q2 2025

Shares 314,136 Value ($000) $229,753 Avg Close $633.58 Range $436.42 - $750.80

Q1 2025

Shares 327,418 Value ($000) $189,896 Avg Close $624.99 Range $550.94 - $718.03

Q4 2024

Shares 343,202 Value ($000) $203,073 Avg Close $716.72 Range $541.09 - $944.19

Q3 2024

Shares 444,965 Value ($000) $411,370 Avg Close $853.35 Range $721.11 - $948.49

Q2 2024

Shares 498,331 Value ($000) $409,469 Avg Close $712.18 Range $577.26 - $845.04

Q1 2024

Shares 293,573 Value ($000) $198,872 Avg Close $657.62 Range $552.66 - $766.48

Q4 2023

Shares 327,232 Value ($000) $206,411 Avg Close $513.84 Range $385.61 - $636.41

Q3 2023

Shares 359,621 Value ($000) $166,145 Avg Close $501.94 Range $430.22 - $584.79

Q2 2023

Shares 326,800 Value ($000) $176,547 Avg Close $465.29 Range $375.28 - $542.22

Q1 2023

Shares 452,155 Value ($000) $226,322 Avg Close $449.31 Range $331.60 - $518.64

Q4 2022

Shares 530,776 Value ($000) $187,688 Avg Close $350.38 Range $294.21 - $405.83

Q3 2022

Shares 451,584 Value ($000) $164,106 Avg Close $432.95 Range $338.72 - $526.93

Q2 2022

Shares 515,768 Value ($000) $198,076 Avg Close $410.37 Range $365.38 - $475.87

Q1 2022

Shares 602,485 Value ($000) $292,615 Avg Close $422.77 Range $340.68 - $499.27

Q4 2021

Shares 624,595 Value ($000) $308,131 Avg Close $500.08 Range $444.81 - $561.94

Q3 2021

Shares 630,986 Value ($000) $305,826 Avg Close $440.15 Range $351.70 - $504.81

Q2 2021

Shares 710,647 Value ($000) $265,391 Avg Close $340.03 Range $291.31 - $382.48

Q1 2021

Shares 653,404 Value ($000) $230,789 Avg Close $351.26 Range $290.78 - $392.28

Q4 2020

Shares 572,481 Value ($000) $209,660 Avg Close $308.64 Range $261.69 - $353.99

Q3 2020

Shares 274,243 Value ($000) $76,681 Avg Close $250.15 Range $223.49 - $273.49

Q2 2020

Shares 506,117 Value ($000) $119,950 Avg Close $194.18 Range $144.85 - $229.19

Q1 2020

Shares 517,687 Value ($000) $86,692 Avg Close $163.85 Range $124.42 - $184.64

Q4 2019

Shares 620,348 Value ($000) $110,434 Avg Close $152.39 Range $125.11 - $175.03

Q3 2019

Shares 613,505 Value ($000) $95,480 Avg Close $142.31 Range $127.77 - $155.32

Q2 2019

Shares 585,941 Value ($000) $79,559 Avg Close $129.05 Range $108.95 - $152.95

Q1 2019

Shares 587,499 Value ($000) $79,600 Avg Close $124.16 Range $101.64 - $137.81

Q4 2018

Shares 504,463 Value ($000) $58,644 Avg Close $112.91 Range $96.22 - $130.06

Q3 2018

Shares 679,666 Value ($000) $85,318 Avg Close $131.20 Range $117.51 - $143.26

Q2 2018

Shares 646,336 Value ($000) $86,396 Avg Close $119.62 Range $102.58 - $133.88

Q1 2018

Shares 623,515 Value ($000) $72,184 Avg Close $111.03 Range $96.61 - $119.53

Q4 2017

Shares 692,258 Value ($000) $77,782 Avg Close $108.54 Range $98.18 - $118.56

Q3 2017

Shares 671,147 Value ($000) $71,511 Avg Close $94.77 Range $87.95 - $100.67

Q2 2017

Shares 506,976 Value ($000) $48,872 Avg Close $88.76 Range $82.13 - $96.78

Q1 2017

Shares 382,999 Value ($000) $35,274 Avg Close $82.35 Range $76.05 - $87.81

Q4 2016

Shares 467,944 Value ($000) $38,339 Avg Close $74.44 Range $69.57 - $81.67

Q3 2016

Shares 461,525 Value ($000) $37,153 Avg Close $68.33 Range $60.21 - $75.04

Q2 2016

Shares 526,514 Value ($000) $35,971 Avg Close $60.38 Range $55.33 - $65.50

Q1 2016

Shares 690,327 Value ($000) $43,932 Avg Close $54.76 Range $50.58 - $59.11

Q4 2015

Shares 658,907 Value ($000) $41,979 Avg Close $56.88 Range $45.12 - $63.43

Q3 2015

Shares 596,658 Value ($000) $30,549 Avg Close $45.23 Range $37.18 - $48.10

Q2 2015

Shares 920,833 Value ($000) $46,695 Avg Close $48.11 Range $44.76 - $50.50

Q1 2015

Shares 927,310 Value ($000) $48,823 Avg Close $45.64 Range $40.76 - $50.87

Q4 2014

Shares 1,093,971 Value ($000) $54,414 Avg Close $40.54 Range $30.68 - $45.83

Q3 2014

Shares 1,082,242 Value ($000) $47,673 Avg Close $39.57 Range $36.40 - $43.40

Q2 2014

Shares 63,615 Value ($000) $2,694 Avg Close $34.76 Range $31.35 - $38.50

Q1 2014

Shares 66,947 Value ($000) $2,596 Avg Close $31.60 Range $27.60 - $35.10

Q4 2013

Shares 75,915 Value ($000) $2,631 Avg Close $28.65 Range $24.43 - $31.16

Q3 2013

Shares 75,236 Value ($000) $2,278 Avg Close $25.18 Range $21.26 - $28.18

Q2 2013

Shares 76,102 Value ($000) $1,835 Avg Close $21.28 Range $18.50 - $22.86

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	134,631	$122,024	$960.73	$831.77 - $1121.48
Q3 2025	280,703	$258,426	$808.07	$684.50 - $934.81
Q2 2025	314,136	$229,753	$633.58	$436.42 - $750.80
Q1 2025	327,418	$189,896	$624.99	$550.94 - $718.03
Q4 2024	343,202	$203,073	$716.72	$541.09 - $944.19
Q3 2024	444,965	$411,370	$853.35	$721.11 - $948.49
Q2 2024	498,331	$409,469	$712.18	$577.26 - $845.04
Q1 2024	293,573	$198,872	$657.62	$552.66 - $766.48
Q4 2023	327,232	$206,411	$513.84	$385.61 - $636.41
Q3 2023	359,621	$166,145	$501.94	$430.22 - $584.79
Q2 2023	326,800	$176,547	$465.29	$375.28 - $542.22
Q1 2023	452,155	$226,322	$449.31	$331.60 - $518.64
Q4 2022	530,776	$187,688	$350.38	$294.21 - $405.83
Q3 2022	451,584	$164,106	$432.95	$338.72 - $526.93
Q2 2022	515,768	$198,076	$410.37	$365.38 - $475.87
Q1 2022	602,485	$292,615	$422.77	$340.68 - $499.27
Q4 2021	624,595	$308,131	$500.08	$444.81 - $561.94
Q3 2021	630,986	$305,826	$440.15	$351.70 - $504.81
Q2 2021	710,647	$265,391	$340.03	$291.31 - $382.48
Q1 2021	653,404	$230,789	$351.26	$290.78 - $392.28
Q4 2020	572,481	$209,660	$308.64	$261.69 - $353.99
Q3 2020	274,243	$76,681	$250.15	$223.49 - $273.49
Q2 2020	506,117	$119,950	$194.18	$144.85 - $229.19
Q1 2020	517,687	$86,692	$163.85	$124.42 - $184.64
Q4 2019	620,348	$110,434	$152.39	$125.11 - $175.03
Q3 2019	613,505	$95,480	$142.31	$127.77 - $155.32
Q2 2019	585,941	$79,559	$129.05	$108.95 - $152.95
Q1 2019	587,499	$79,600	$124.16	$101.64 - $137.81
Q4 2018	504,463	$58,644	$112.91	$96.22 - $130.06
Q3 2018	679,666	$85,318	$131.20	$117.51 - $143.26
Q2 2018	646,336	$86,396	$119.62	$102.58 - $133.88
Q1 2018	623,515	$72,184	$111.03	$96.61 - $119.53
Q4 2017	692,258	$77,782	$108.54	$98.18 - $118.56
Q3 2017	671,147	$71,511	$94.77	$87.95 - $100.67
Q2 2017	506,976	$48,872	$88.76	$82.13 - $96.78
Q1 2017	382,999	$35,274	$82.35	$76.05 - $87.81
Q4 2016	467,944	$38,339	$74.44	$69.57 - $81.67
Q3 2016	461,525	$37,153	$68.33	$60.21 - $75.04
Q2 2016	526,514	$35,971	$60.38	$55.33 - $65.50
Q1 2016	690,327	$43,932	$54.76	$50.58 - $59.11
Q4 2015	658,907	$41,979	$56.88	$45.12 - $63.43
Q3 2015	596,658	$30,549	$45.23	$37.18 - $48.10
Q2 2015	920,833	$46,695	$48.11	$44.76 - $50.50
Q1 2015	927,310	$48,823	$45.64	$40.76 - $50.87
Q4 2014	1,093,971	$54,414	$40.54	$30.68 - $45.83
Q3 2014	1,082,242	$47,673	$39.57	$36.40 - $43.40
Q2 2014	63,615	$2,694	$34.76	$31.35 - $38.50
Q1 2014	66,947	$2,596	$31.60	$27.60 - $35.10
Q4 2013	75,915	$2,631	$28.65	$24.43 - $31.16
Q3 2013	75,236	$2,278	$25.18	$21.26 - $28.18
Q2 2013	76,102	$1,835	$21.28	$18.50 - $22.86