Property, Plant and Equipment Disclosure
Asset Age Ratios (Summary)
Average Age
Estimated Total Useful Life
Estimated Age, Time Elapsed Since Purchase
Estimated Remaining Life

Monolithic Power Systems Inc., balance sheet: property, plant and equipment

US$ in thousands

	Dec 31, 2024	Dec 31, 2023	Dec 31, 2022	Dec 31, 2021	Dec 31, 2020
Land	50,681)	48,490)	41,924)	38,872)	35,432)
Production equipment and software	340,691)	270,390)	254,882)	233,398)	163,317)
Buildings and improvements	224,490)	205,132)	195,205)	202,901)	142,869)
Transportation equipment	72,044)	28,641)	28,612)	28,608)	18,396)
Leasehold improvements	18,301)	17,052)	17,389)	8,990)	8,705)
Furniture and fixtures	13,472)	11,711)	11,378)	10,738)	6,383)
Construction in progress	27,477)	16,980)	1,908)	11,333)	49,575)
Property and equipment, gross	747,156)	598,396)	551,298)	534,840)	424,677)
Accumulated depreciation and amortization	(252,211)	(229,444)	(194,141)	(171,878)	(143,149)
Property and equipment, net	494,945)	368,952)	357,157)	362,962)	281,528)

Based on: 10-K (reporting date: 2024-12-31), 10-K (reporting date: 2023-12-31), 10-K (reporting date: 2022-12-31), 10-K (reporting date: 2021-12-31), 10-K (reporting date: 2020-12-31).

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Item	Description	The company
Property and equipment, gross	Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.	Monolithic Power Systems Inc. property and equipment, gross increased from 2022 to 2023 and from 2023 to 2024.
Property and equipment, net	Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.	Monolithic Power Systems Inc. property and equipment, net increased from 2022 to 2023 and from 2023 to 2024.

Monolithic Power Systems Inc., asset age ratios

	Dec 31, 2024	Dec 31, 2023	Dec 31, 2022	Dec 31, 2021	Dec 31, 2020
Average age ratio	36.21%	41.72%	38.11%	34.66%	36.78%
Estimated total useful life (years)	20	14	14	17	21
Estimated age, time elapsed since purchase (years)	7	6	5	6	8
Estimated remaining life (years)	13	8	9	11	13

Based on: 10-K (reporting date: 2024-12-31), 10-K (reporting date: 2023-12-31), 10-K (reporting date: 2022-12-31), 10-K (reporting date: 2021-12-31), 10-K (reporting date: 2020-12-31).

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Asset age ratio	Description	The company
Average age ratio	As long as straight-line depreciation is used, this is an accurate estimate of asset age as a percentage of depreciable life. The relative age is a useful measure of whether the company fixed asset base is old or new. Newer assets are likely to be more efficient.	Monolithic Power Systems Inc. average age ratio of depreciable property, plant and equipment deteriorated from 2022 to 2023 but then improved from 2023 to 2024 exceeding 2022 level.
Estimated total useful life	Over longer time periods, this ratio is a useful measure of company depreciation policy and can be used for comparisons with competitors.	Monolithic Power Systems Inc. estimated total useful life of depreciable property, plant and equipment decreased from 2022 to 2023 but then increased from 2023 to 2024 exceeding 2022 level.
Estimated time elapsed since purchase	The approximate age in years of a company fixed assets. Useful for comparison purposes.	Monolithic Power Systems Inc. estimated time elapsed since purchase of depreciable property, plant and equipment deteriorated from 2022 to 2023 and from 2023 to 2024.
Estimated remaining life		Monolithic Power Systems Inc. estimated remaining life of depreciable property, plant and equipment decreased from 2022 to 2023 but then increased from 2023 to 2024 exceeding 2022 level.

	Dec 31, 2024	Dec 31, 2023	Dec 31, 2022	Dec 31, 2021	Dec 31, 2020
Selected Financial Data (US$ in thousands)
Accumulated depreciation and amortization	252,211)	229,444)	194,141)	171,878)	143,149)
Property and equipment, gross	747,156)	598,396)	551,298)	534,840)	424,677)
Land	50,681)	48,490)	41,924)	38,872)	35,432)
Asset Age Ratio
Average age¹	36.21%	41.72%	38.11%	34.66%	36.78%

Based on: 10-K (reporting date: 2024-12-31), 10-K (reporting date: 2023-12-31), 10-K (reporting date: 2022-12-31), 10-K (reporting date: 2021-12-31), 10-K (reporting date: 2020-12-31).

2024 Calculations

¹ Average age = 100 × Accumulated depreciation and amortization ÷ (Property and equipment, gross – Land)
= 100 × 252,211 ÷ (747,156 – 50,681) = 36.21%

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Asset age ratio	Description	The company
Average age	As long as straight-line depreciation is used, this is an accurate estimate of asset age as a percentage of depreciable life. The relative age is a useful measure of whether the company fixed asset base is old or new. Newer assets are likely to be more efficient.	Monolithic Power Systems Inc. average age ratio of depreciable property, plant and equipment deteriorated from 2022 to 2023 but then improved from 2023 to 2024 exceeding 2022 level.

	Dec 31, 2024	Dec 31, 2023	Dec 31, 2022	Dec 31, 2021	Dec 31, 2020
Selected Financial Data (US$ in thousands)
Property and equipment, gross	747,156)	598,396)	551,298)	534,840)	424,677)
Land	50,681)	48,490)	41,924)	38,872)	35,432)
Depreciation and amortization expense on property and equipment	35,100)	40,000)	36,800)	28,400)	18,900)
Asset Age Ratio (Years)
Estimated total useful life¹	20	14	14	17	21

Based on: 10-K (reporting date: 2024-12-31), 10-K (reporting date: 2023-12-31), 10-K (reporting date: 2022-12-31), 10-K (reporting date: 2021-12-31), 10-K (reporting date: 2020-12-31).

2024 Calculations

¹ Estimated total useful life = (Property and equipment, gross – Land) ÷ Depreciation and amortization expense on property and equipment
= (747,156 – 50,681) ÷ 35,100 = 20

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Asset age ratio	Description	The company
Estimated total useful life	Over longer time periods, this ratio is a useful measure of company depreciation policy and can be used for comparisons with competitors.	Monolithic Power Systems Inc. estimated total useful life of depreciable property, plant and equipment decreased from 2022 to 2023 but then increased from 2023 to 2024 exceeding 2022 level.

	Dec 31, 2024	Dec 31, 2023	Dec 31, 2022	Dec 31, 2021	Dec 31, 2020
Selected Financial Data (US$ in thousands)
Accumulated depreciation and amortization	252,211)	229,444)	194,141)	171,878)	143,149)
Depreciation and amortization expense on property and equipment	35,100)	40,000)	36,800)	28,400)	18,900)
Asset Age Ratio (Years)
Time elapsed since purchase¹	7	6	5	6	8

Based on: 10-K (reporting date: 2024-12-31), 10-K (reporting date: 2023-12-31), 10-K (reporting date: 2022-12-31), 10-K (reporting date: 2021-12-31), 10-K (reporting date: 2020-12-31).

2024 Calculations

¹ Time elapsed since purchase = Accumulated depreciation and amortization ÷ Depreciation and amortization expense on property and equipment
= 252,211 ÷ 35,100 = 7

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Asset age ratio	Description	The company
Estimated time elapsed since purchase	The approximate age in years of a company fixed assets. Useful for comparison purposes.	Monolithic Power Systems Inc. estimated time elapsed since purchase of depreciable property, plant and equipment deteriorated from 2022 to 2023 and from 2023 to 2024.

	Dec 31, 2024	Dec 31, 2023	Dec 31, 2022	Dec 31, 2021	Dec 31, 2020
Selected Financial Data (US$ in thousands)
Property and equipment, net	494,945)	368,952)	357,157)	362,962)	281,528)
Land	50,681)	48,490)	41,924)	38,872)	35,432)
Depreciation and amortization expense on property and equipment	35,100)	40,000)	36,800)	28,400)	18,900)
Asset Age Ratio (Years)
Estimated remaining life¹	13	8	9	11	13

Based on: 10-K (reporting date: 2024-12-31), 10-K (reporting date: 2023-12-31), 10-K (reporting date: 2022-12-31), 10-K (reporting date: 2021-12-31), 10-K (reporting date: 2020-12-31).

2024 Calculations

¹ Estimated remaining life = (Property and equipment, net – Land) ÷ Depreciation and amortization expense on property and equipment
= (494,945 – 50,681) ÷ 35,100 = 13

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Asset age ratio	Description	The company
Estimated remaining life		Monolithic Power Systems Inc. estimated remaining life of depreciable property, plant and equipment decreased from 2022 to 2023 but then increased from 2023 to 2024 exceeding 2022 level.

Monolithic Power Systems Inc. (NASDAQ:MPWR)

Analysis of Property, Plant and Equipment

Property, Plant and Equipment Disclosure

Asset Age Ratios (Summary)

Average Age

Estimated Total Useful Life

Estimated Age, Time Elapsed since Purchase

Estimated Remaining Life