Exhibit 99.1

PRESS RELEASE

For Immediate Release

Monolithic Power Systems Announces

Results for the Third Quarter Ended September 30, 2021

KIRKLAND, WASHINGTON, October 28, 2021-- Monolithic Power Systems, Inc. (MPS) (Nasdaq: MPWR), a global company that provides high-performance, semiconductor-based power electronics solutions, today announced financial results for the quarter ended September 30, 2021. 

● Revenue was $323.5 million for the quarter ended September 30, 2021, a 10.3% increase from $293.3 million for the quarter ended June 30, 2021 and a 24.7% increase from $259.4 million for the quarter ended September 30, 2020.

● GAAP gross margin was 57.6% for the quarter ended September 30, 2021, compared with 55.1% for the quarter ended September 30, 2020. GAAP gross margin included a one-time benefit of a $4.0 million litigation settlement for the quarter ended September 30, 2021.

● Non-GAAP (1) gross margin was 57.8% for the quarter ended September 30, 2021, excluding the impact of $0.9 million for stock-based compensation expense and $0.2 million for deferred compensation plan income. Excluding the one-time benefit of a $4.0 million litigation settlement, non-GAAP (1) gross margin would have been 56.6% for the quarter ended September 30, 2021. This compares with 55.5% for the quarter ended September 30, 2020, excluding the impact of $0.7 million for stock-based compensation expense and $0.2 million for deferred compensation plan expense.

● GAAP operating expenses were $109.2 million for the quarter ended September 30, 2021, compared with $83.1 million for the quarter ended September 30, 2020.

● Non-GAAP (1) operating expenses were $78.7 million for the quarter ended September 30, 2021, excluding $30.7 million for stock-based compensation expense and $0.1 million for deferred compensation plan income, compared with $59.1 million for the quarter ended September 30, 2020, excluding $22.3 million for stock-based compensation expense and $1.7 million for deferred compensation plan expense.

● GAAP operating income was $77.1 million for the quarter ended September 30, 2021, compared with $60.0 million for the quarter ended September 30, 2020.

● Non-GAAP (1) operating income was $108.4 million for the quarter ended September 30, 2021, excluding $31.6 million for stock-based compensation expense and $0.3 million for deferred compensation plan income, compared with $84.9 million for the quarter ended September 30, 2020, excluding $23.0 million for stock-based compensation expense and $1.9 million for deferred compensation plan expense.

● GAAP other income, net, was $0.8 million for the quarter ended September 30, 2021, compared with $2.5 million for the quarter ended September 30, 2020.

● Non-GAAP (1) other income, net, was $1.2 million for the quarter ended September 30, 2021, excluding $0.4 million for deferred compensation plan expense, compared with $0.9 million for the quarter ended September 30, 2020, excluding $1.6 million for deferred compensation plan income.

● GAAP income before income taxes was $77.9 million for the quarter ended September 30, 2021, compared with $62.5 million for the quarter ended September 30, 2020.

● Non-GAAP (1) income before income taxes was $109.6 million for the quarter ended September 30, 2021, excluding $31.6 million for stock-based compensation expense and $0.1 million for deferred compensation plan expense, compared with $85.8 million for the quarter ended September 30, 2020, excluding $23.0 million for stock-based compensation expense, and $0.3 million for deferred compensation plan expense.

● GAAP net income was $68.8 million and $1.44 per diluted share for the quarter ended September 30, 2021. Comparatively, GAAP net income was $55.6 million and $1.18 per diluted share for the quarter ended September 30, 2020.

● Non-GAAP (1) net income was $98.6 million and $2.06 per diluted share for the quarter ended September 30, 2021, excluding stock-based compensation expense, net deferred compensation plan expense and related tax effects, compared with non-GAAP net income (1) of $79.4 million and $1.69 per diluted share for the quarter ended September 30, 2020, excluding stock-based compensation expense, net deferred compensation plan expense and related tax effects.

The financial results for the nine months ended September 30, 2021 are as follows:

● Revenue was $871.3 million for the nine months ended September 30, 2021, a 42.5% increase from $611.4 million for the nine months ended September 30, 2020.

● GAAP gross margin was 56.4% for the nine months ended September 30, 2021, compared with 55.1% for the nine months ended September 30, 2020.

● Non-GAAP (1) gross margin was 56.7% for the nine months ended September 30, 2021, excluding the impact of $2.6 million for stock-based compensation expense and $0.1 million for deferred compensation plan expense, compared with 55.5% for the nine months ended September 30, 2020, excluding the impact of $1.9 million for stock-based compensation expense and $0.7 million for the deferred compensation plan expense.

● GAAP operating expenses were $307.7 million for the nine months ended September 30, 2021, compared with $218.2 million for the nine months ended September 30, 2020.

● Non-GAAP (1) operating expenses were $215.2 million for the nine months ended September 30, 2021, excluding $89.7 million for stock-based compensation expense and $2.8 million for deferred compensation plan expense, compared with $155.8 million for the nine months ended September 30, 2020, excluding $60.7 million for stock-based compensation expense and $1.7 million for deferred compensation plan expense.

● GAAP operating income was $183.8 million for the nine months ended September 30, 2021, compared with $118.9 million for the nine months ended September 30, 2020.

● Non-GAAP (1) operating income was $279.1 million for the nine months ended September 30, 2021, excluding $92.3 million for stock-based compensation expense and $2.9 million for deferred compensation plan expense, compared with $183.8 million for the nine months ended September 30, 2020, excluding $62.6 million for stock-based compensation expense and $2.3 million for deferred compensation plan expense.

● GAAP other income, net, was $6.4 million for the nine months ended September 30, 2021, compared with $6.0 million for the nine months ended September 30, 2020.

● Non-GAAP (1) other income, net was $3.8 million for the nine months ended September 30, 2021, excluding $2.6 million for deferred compensation plan income, compared with $4.6 million for the nine months ended September 30, 2020, excluding $1.4 million for deferred compensation plan income.

● GAAP income before income taxes was $190.3 million for the nine months ended September 30, 2021, compared with $124.9 million for the nine months ended September 30, 2020.

● Non-GAAP (1) income before income taxes was $282.9 million for the nine months ended September 30, 2021, excluding $92.3 million for stock-based compensation expense and $0.3 million for deferred compensation plan expense, compared with $188.4 million for the nine months ended September 30, 2020, excluding $62.6 million for stock-based compensation expense, and $0.9 million for deferred compensation plan expense.

● GAAP net income was $169.4 million and $3.55 per diluted share for the nine months ended September 30, 2021. Comparatively, GAAP net income was $121.5 million and $2.59 per diluted share for the nine months ended September 30, 2020.

● Non-GAAP (1) net income was $254.6 million and $5.33 per diluted share for the nine months ended September 30, 2021, excluding stock-based compensation expense, net deferred compensation plan expense and related tax effects, compared with non-GAAP net income (1) of $174.3 million and $3.72 per diluted share for the nine months ended September 30, 2020, excluding stock-based compensation expense, net deferred compensation plan expense and related tax effects.

The following is a summary of revenue by end market for the periods indicated (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
End Market	2021		2020		2021		2020
Computing and storage	$	98,601	$	75,301	$	253,819	$	191,345
Automotive		54,416		28,512		147,982		69,603
Industrial		52,185		30,658		135,296		82,487
Communications		44,687		54,705		118,215		112,670
Consumer		73,633		70,246		215,982		155,304
Total	$	323,522	$	259,422	$	871,294	$	611,409

The following is a summary of revenue by product family for the periods indicated (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
Product Family	2021		2020		2021		2020
DC to DC	$	307,368	$	247,561	$	827,605	$	580,549
Lighting Control		16,154		11,861		43,689		30,860
Total	$	323,522	$	259,422	$	871,294	$	611,409

“We are continuing to execute our strategy,” said Michael Hsing, CEO and founder of MPS.

Business Outlook

The following are MPS’s financial targets for the fourth quarter ending December 31, 2021:

● Revenue in the range of $314.0 million to $326.0 million.

● GAAP gross margin between 56.0% and 56.6%. Non-GAAP (1) gross margin between 56.3% and 56.9%, which excludes an estimated impact of stock-based compensation expenses of 0.3%.

● GAAP research and development (“R&D”) and selling, general and administrative (“SG&A”) expenses between $107.8 million and $111.8 million. Non-GAAP (1) R&D and SG&A expenses between $77.9 million and $79.9 million, which excludes estimated stock-based compensation expenses in the range of $29.9 million to $31.9 million.

● Total stock-based compensation expense of $30.8 million to $32.8 million.

● Litigation expense is expected to be in the range of $3.5 million and $3.9 million.

● Interest income of $1.0 million to $1.4 million.

● Fully diluted shares outstanding between 47.9 million and 48.9 million.

(1) Non-GAAP net income, non-GAAP earnings per share, non-GAAP gross margin, non-GAAP R&D and SG&A expenses, non-GAAP operating expenses, non-GAAP other income, net, non-GAAP operating income and non-GAAP income before taxes differ from net income, earnings per share, gross margin, R&D and SG&A expenses, operating expenses, other income, net, operating income and income before taxes determined in accordance with Generally Accepted Accounting Principles in the United States (GAAP). Non-GAAP net income and non-GAAP earnings per share exclude the effect of stock-based compensation expense, deferred compensation plan income/expense and related tax effects. Non-GAAP gross margin excludes the effect of stock-based compensation expense, deferred compensation plan income/expense, and a one-time litigation settlement. Non-GAAP operating expenses exclude the effect of stock-based compensation expense and deferred compensation plan income/expense. Non-GAAP other income, net excludes the effect of deferred compensation plan income/expense. Non-GAAP operating income excludes the effect of stock-based compensation expense and deferred compensation plan income/expense. Non-GAAP income before taxes excludes the effect of stock-based compensation expense and deferred compensation plan income/expense. Projected non-GAAP gross margin excludes the effect of stock-based compensation expense. Projected non-GAAP R&D and SG&A expenses exclude the effect of stock-based compensation expense. These non-GAAP financial measures are not prepared in accordance with GAAP and should not be considered as a substitute for, or superior to, measures of financial performance prepared in accordance with GAAP. A schedule reconciling non-GAAP financial measures is included at the end of this press release. MPS utilizes both GAAP and non- GAAP financial measures to assess what it believes to be its core operating performance and to evaluate and manage its internal business and assist in making financial operating decisions. MPS believes that the inclusion of non-GAAP financial measures, together with GAAP measures, provides investors with an alternative presentation useful to investors' understanding of MPS's core operating results and trends. Additionally, MPS believes that the inclusion of non-GAAP measures, together with GAAP measures, provides investors with an additional dimension of comparability to similar companies. However, investors should be aware that non-GAAP financial measures utilized by other companies are not likely to be comparable in most cases to the non-GAAP financial measures used by MPS.

Earnings Webinar

MPS plans to host a Zoom webinar covering its financial results at 2:00 p.m. PT / 5:00 p.m. ET, October 28, 2021. You can access the webinar at: https://mpsic.zoom.us/j/97341463994. The webinar will be archived and available for replay for one year under the Investor Relations page on the MPS website.

Safe Harbor Statement

This press release contains, and statements that will be made during the accompanying teleconference will contain, forward-looking statements, as that term is defined in the Private Securities Litigation Reform Act of 1995, including, among other things, (i) projected revenues, GAAP and non-GAAP gross margin, GAAP and non-GAAP R&D and SG&A expenses, stock-based compensation expenses, litigation expenses, interest income, and diluted shares outstanding, (ii) our outlook for the long-term prospects of the company, including our performance against our business plan, revenue growth in certain of our market segments, our continued investment into R&D, expected revenue growth, customers' acceptance of our new product offerings, the prospects of our new product development, and our expectations regarding market and industry segment trends and prospects, (iii) our ability to penetrate new markets and expand our market share, (iv) the seasonality of our business, (v) our ability to reduce our expenses, and (vi) statements of the assumptions underlying or relating to any statement described in (i), (ii), (iii), (iv), or (v). These forward-looking statements are not historical facts or guarantees of future performance or events, are based on current expectations, estimates, beliefs, assumptions, goals, and objectives, and involve significant known and unknown risks, uncertainties and other factors that may cause actual results to be materially different from the results expressed by these statements. Readers of this press release and listeners to the accompanying conference call are cautioned not to place undue reliance on any forward-looking statements, which speak only as of the date hereof. Factors that could cause actual results to differ include, but are not limited to, our ability to attract new customers and retain existing customers; acceptance of, or demand for, MPS’s products, in particular the new products launched recently, being different than expected; our ability to efficiently and effectively develop new products and receive a return on our R&D expense investment; our ability to increase market share in our targeted markets; our ability to meet customer demand for our products due to constraints on our third-party suppliers’ ability to manufacture sufficient quantities of our products or otherwise; competition generally and the increasingly competitive nature of our industry; any market disruptions or interruptions in MPS’s schedule of new product development releases; adverse changes in production and testing efficiency of our products; our ability to manage our inventory levels; our ability to effectively manage our growth and attract and retain qualified personnel; the effect of export controls, trade and economic sanctions regulations and other regulatory or contractual limitations on our ability to sell or develop our products in certain foreign markets, particularly in China; our ability to obtain governmental licenses and approvals for international trading activities or technology transfers, including export licenses; adverse changes in laws and government regulations such as tariffs on imports of foreign goods, export regulations and export classifications, including in foreign countries where MPS has offices or operations; adverse events arising from orders of governmental entities, including such orders that impact our customers, and adoption of new or amended accounting standards; the effect of epidemics and pandemics, such as the COVID-19 outbreak first identified in December 2019, on the global economy and on our business; adequate supply of our products from our third-party manufacturing partners; the risks, uncertainties and costs of litigation in which we are involved; the outcome of any upcoming trials, hearings, motions and appeals; the adverse impact on MPS’s financial performance if its tax and litigation provisions are inadequate; adverse changes or developments in the semiconductor industry generally, which is cyclical in nature, and our ability to adjust our operations to address such changes or developments; difficulty in predicting or budgeting for future customer demand and channel inventories, expenses and financial contingencies (including as a result of the COVID-19 pandemic); our ability to realize the anticipated benefits of companies and products that we acquire, and our ability to effectively and efficiently integrate these acquired companies and products into our operations; the ongoing consolidation of companies in the semiconductor industry; and other important risk factors identified in MPS’s Securities and Exchange Commission (SEC) filings, including, but not limited to, our Annual Report on Form 10-K filed with the SEC on March 1, 2021 and our quarterly report on Form 10-Q filed with the SEC on August 9, 2021. The forward-looking statements in this press release and statements made during the accompanying teleconference represent MPS’s projections and current expectations, as of the date hereof, not predictions of actual performance. MPS assumes no obligation to update the information in this press release or in the accompanying conference call.

About Monolithic Power Systems

Monolithic Power Systems, Inc. (MPS) is a global company that provides high-performance, semiconductor-based power electronics solutions. MPS’s mission is to reduce energy and material consumption to improve all aspects of quality of life. Founded in 1997 by Michael Hsing, MPS has three core strengths: deep system-level knowledge, strong semiconductor design expertise, and innovative proprietary semiconductor process and system integration technologies. These combined advantages enable MPS to provide customers with reliable, compact and monolithic solutions that offer highly energy-efficient and cost-effective products, as well as providing a consistent return on investment to our stockholders. MPS can be contacted through its website at www.monolithicpower.com or its support offices around the world.

Monolithic Power Systems, MPS, and the MPS logo are registered trademarks of Monolithic Power Systems, Inc. in the U.S. and trademarked in certain other countries.

Contact:

Bernie Blegen

Chief Financial Officer

Monolithic Power Systems, Inc.

408-826-0777

investors@monolithicpower.com

Monolithic Power Systems, Inc.

Condensed Consolidated Balance Sheets

(Unaudited, in thousands, except par value) 

	September 30,		December 31,
	2021		2020
ASSETS
Current assets:
Cash and cash equivalents	$	226,091	$	334,944
Short-term investments		515,947		260,169
Accounts receivable, net		79,859		66,843
Inventories		208,062		157,062
Other current assets		34,535		22,980
Total current assets		1,064,494		841,998
Property and equipment, net		340,060		281,528
Goodwill		6,571		6,571
Deferred tax assets, net		17,726		18,556
Other long-term assets		67,050		59,838
Total assets	$	1,495,901	$	1,208,491
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	72,092	$	38,169
Accrued compensation and related benefits		75,815		45,840
Other accrued liabilities		79,756		62,960
Total current liabilities		227,663		146,969
Income tax liabilities		41,019		37,062
Other long-term liabilities		64,506		57,873
Total liabilities		333,188		241,904
Commitments and contingencies
Stockholders’ equity:
Common stock and additional paid-in capital: $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 46,091 and 45,267, respectively		769,858		657,701
Retained earnings		381,193		298,746
Accumulated other comprehensive income		11,662		10,140
Total stockholders’ equity		1,162,713		966,587
Total liabilities and stockholders’ equity	$	1,495,901	$	1,208,491

Monolithic Power Systems, Inc.

Condensed Consolidated Statements of Operations

(Unaudited, in thousands, except per share amounts)

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Revenue	$	323,522	$	259,422	$	871,294	$	611,409
Cost of revenue		137,211		116,382		379,709		274,329
Gross profit		186,311		143,040		491,585		337,080
Operating expenses:
Research and development		49,468		37,717		136,113		95,346
Selling, general and administrative		56,291		43,503		164,982		116,550
Litigation expense		3,421		1,841		6,645		6,264
Total operating expenses		109,180		83,061		307,740		218,160
Income from operations		77,131		59,979		183,845		118,920
Other income, net		793		2,494		6,411		5,980
Income before income taxes		77,924		62,473		190,256		124,900
Income tax expense		9,154		6,907		20,904		3,412
Net income	$	68,770	$	55,566	$	169,352	$	121,488
Net income per share:
Basic	$	1.50	$	1.24	$	3.70	$	2.72
Diluted	$	1.44	$	1.18	$	3.55	$	2.59
Weighted-average shares outstanding:
Basic		45,970		44,970		45,754		44,737
Diluted		47,852		46,955		47,772		46,819

SUPPLEMENTAL FINANCIAL INFORMATION 

STOCK-BASED COMPENSATION EXPENSE

(Unaudited, in thousands)

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Cost of revenue	$	922	$	707	$	2,622	$	1,906
Research and development		6,646		5,334		19,564		14,666
Selling, general and administrative		24,004		16,934		70,096		46,009
Total stock-based compensation expense	$	31,572	$	22,975	$	92,282	$	62,581

RECONCILIATION OF NET INCOME TO NON-GAAP NET INCOME

(Unaudited, in thousands, except per share amounts)

	Three Months Ended September 30,					Nine Months Ended September 30,
	2021			2020		2021			2020
Net income	$	68,770		$	55,566	$	169,352		$	121,488
Adjustments to reconcile net income to non-GAAP net income:
Stock-based compensation expense		31,572			22,975		92,282			62,581
Amortization of purchased intangible assets		11			-		11			-
Deferred compensation plan expense		76			347		309			901
Tax effect		(1,804	)		472		(7,382	)		(10,717	)
Non-GAAP net income	$	98,625		$	79,360	$	254,572		$	174,253
Non-GAAP net income per share:
Basic	$	2.15		$	1.76	$	5.56		$	3.90
Diluted	$	2.06		$	1.69	$	5.33		$	3.72
Shares used in the calculation of non-GAAP net income per share:
Basic		45,970			44,970		45,754			44,737
Diluted		47,852			46,955		47,772			46,819

RECONCILIATION OF GROSS MARGIN TO NON-GAAP GROSS MARGIN

(Unaudited, in thousands)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2021			2020			2021			2020
Gross profit	$	186,311		$	143,040		$	491,585		$	337,080
Gross margin		57.6	%		55.1	%		56.4	%		55.1	%
Adjustments to reconcile gross profit to non-GAAP gross profit:
Stock-based compensation expense		922			707			2,622			1,906
Deferred compensation plan expense (income)		(190	)		244			100			650
Non-GAAP gross profit	$	187,043		$	143,991		$	494,307		$	339,636
Non-GAAP gross margin		57.8	%		55.5	%		56.7	%		55.5	%
Non-GAAP gross profit	$	187,043
One-time litigation settlement		(4,000	)
Non-GAAP gross profit, excluding litigation settlement	$	183,043
Non-GAAP gross margin, excluding litigation settlement		56.6	%

RECONCILIATION OF OPERATING EXPENSES TO NON-GAAP OPERATING EXPENSES

(Unaudited, in thousands)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2021			2020			2021			2020
Total operating expenses	$	109,180		$	83,061		$	307,740		$	218,160
Adjustments to reconcile total operating expenses to non-GAAP total operating expenses:
Stock-based compensation expense		(30,650	)		(22,268	)		(89,660	)		(60,675	)
Amortization of purchased intangible assets		(11	)		-			(11	)		-
Deferred compensation plan income (expense)		134			(1,701	)		(2,847	)		(1,672	)
Non-GAAP operating expenses	$	78,653		$	59,092		$	215,222		$	155,813

RECONCILIATION OF OPERATING INCOME TO NON-GAAP OPERATING INCOME

(Unaudited, in thousands)

	Three Months Ended September 30,					Nine Months Ended September 30,
	2021			2020		2021		2020
Total operating income	$	77,131		$	59,979	$	183,845	$	118,920
Adjustments to reconcile total operating income to non-GAAP total operating income:
Stock-based compensation expense		31,572			22,975		92,282		62,581
Amortization of purchased intangible assets		11			-		11		-
Deferred compensation plan expense (income)		(324	)		1,946		2,948		2,322
Non-GAAP operating income	$	108,390		$	84,900	$	279,086	$	183,823

RECONCILIATION OF OTHER INCOME, NET, TO NON-GAAP OTHER INCOME, NET

(Unaudited, in thousands)

	Three Months Ended September 30,					Nine Months Ended September 30,
	2021		2020			2021			2020
Total other income, net	$	793	$	2,494		$	6,411		$	5,980
Adjustments to reconcile other income, net to non-GAAP other income, net:
Deferred compensation plan expense (income)		399		(1,598	)		(2,639	)		(1,421	)
Non-GAAP other income, net	$	1,192	$	896		$	3,772		$	4,559

RECONCILIATION OF INCOME BEFORE INCOME TAXES TO NON-GAAP INCOME BEFORE INCOME TAXES

(Unaudited, in thousands)

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Total income before income taxes	$	77,924	$	62,473	$	190,256	$	124,900
Adjustments to reconcile income before income taxes to non-GAAP income before income taxes:
Stock-based compensation expense		31,572		22,975		92,282		62,581
Amortization of purchased intangible assets		11		-		11		-
Deferred compensation plan expense		76		347		309		901
Non-GAAP income before income taxes	$	109,583	$	85,795	$	282,858	$	188,382

2021 FOURTH QUARTER OUTLOOK

RECONCILIATION OF GROSS MARGIN TO NON-GAAP GROSS MARGIN

(Unaudited)

	Three Months Ending
	December 31, 2021
	Low			High
Gross margin		56.0	%		56.6	%
Adjustment to reconcile gross margin to non-GAAP gross margin:
Stock-based compensation expense		0.3	%		0.3	%
Non-GAAP gross margin		56.3	%		56.9	%

RECONCILIATION OF R&D AND SG&A EXPENSES TO NON-GAAP R&D AND SG&A EXPENSES

(Unaudited, in thousands)

	Three Months Ending
	December 31, 2021
	Low			High
R&D and SG&A expense	$	107,800		$	111,800
Adjustments to reconcile R&D and SG&A expense to non-GAAP R&D and SG&A expense:
Stock-based compensation expense		(29,900	)		(31,900	)
Non-GAAP R&D and SG&A expense	$	77,900		$	79,900