Monolithic Power Systems Prevails in Patent Infringement Lawsuit Brought by Bel Power Solutions in West Texas, with Bel Power Solutions Paying Costs

Monolithic Power Systems (Nasdaq: MPWR) announced a favorable resolution of a patent lawsuit filed by Bel Power Solutions in the U.S. District Court for the Western District of Texas on April 30, 2026.

Rhea-AI Summary

Monolithic Power Systems (Nasdaq: MPWR) announced a favorable resolution of a patent lawsuit filed by Bel Power Solutions in the U.S. District Court for the Western District of Texas on April 30, 2026.

The court granted summary judgment of non-infringement on all asserted claims, Bel Power agreed MPS was the prevailing party, and Bel Power will pay MPS court costs of $50,000. Ex parte reexamination at the U.S. Patent and Trademark Office led to the cancellation of four Bel Power patents.

Positive

• Court granted summary judgment of non-infringement on all asserted claims
• Bel Power agreed MPS is the prevailing party
• Bel Power to pay $50,000 in MPS court costs
• Four Bel Power patents canceled via USPTO ex parte reexamination

Negative

• None.

Argus May 1 session

-1.92% close to close Open Argus

Details

News Market Reaction – MPWR

On May 1, the first trading day after this news, MPWR closed 1.92% below the previous close.

Data tracked by StockTitan Argus for the May 1 session.

Key Figures

Court costs reimbursement: $50,000 Q1 2026 revenue: $804.2M Q1 2026 GAAP diluted EPS: $3.92 +5 more

Court costs reimbursement

$50,000

Bel Power to pay MPS’s court costs in lawsuit resolution

Q1 2026 revenue

$804.2M

Up 26.1% year over year and 7.1% sequentially per 8-K

Q1 2026 GAAP diluted EPS

$3.92

GAAP EPS, up 39.5% year over year per 8-K

Q1 2026 non-GAAP diluted EPS

$5.10

Non-GAAP EPS, up 26.2% year over year per 8-K

Enterprise Data revenue

$262.8M

Q1 2026 Enterprise Data segment, up 97.7% year over year

Cash & investments

$1,367.1M

Cash, cash equivalents and short-term investments at Q1 2026 quarter end

Vanguard stake (3/31/2026)

3,561,866 shares (7.25%)

Beneficial ownership reported on Schedule 13G dated 04/30/2026

Shares outstanding

49,129,267

Common shares outstanding as of 04/15/2026 per DEF 14A

Historical Context

5 past events · Latest: Apr 23

5 events

1. Apr 23

   Leveraged ETF launch

   24h Move

   +4.6%

   Launch of single-stock 2X leveraged ETF tied to MPWR performance.

2. Apr 15

   Earnings date notice

   24h Move

   +3.7%

   Announcement of Q1 2026 earnings release timing and investor webinar.

3. Feb 12

   Venture arm launch

   24h Move

   -3.4%

   Third-party venture arm launch focused on tech and datacenter themes.

4. Feb 05

   CFO transition

   24h Move

   +6.4%

   Announcement of CFO retirement and interim replacement from internal ranks.

5. Feb 05

   Earnings & dividend

   24h Move

   +6.4%

   Strong Q4 and 2025 results plus an increase in quarterly cash dividend.

24h Move is the share-price change in the day after each event; other market factors may also have contributed.

Key Terms

ex parte reexamination, summary judgment, non-infringement, federal rule of civil procedure 54(d)

4 terms

ex parte reexamination regulatory

"MPS had initiated ex parte reexamination proceedings at the U.S. Patent and Trademark Office"

An ex parte reexamination is a formal review by a patent office that rechecks whether an issued patent should have been granted, based on prior public information. Think of it as a one-sided second opinion where the challenger can ask for the review but, once it starts, the patent holder mainly responds through written submissions rather than ongoing back-and-forth; the outcome can quietly weaken, cancel, or confirm patent protection, which matters to investors because patents often underpin a company’s competitive edge, revenue prospects and legal risk.

summary judgment regulatory

"granting MPS’s motion for summary judgment of non-infringement on all patent claims"

Summary judgment is a court decision made without a full trial when a judge concludes there is no real dispute about the important facts and one side wins as a matter of law. For investors it matters because such a ruling can quickly end litigation that might otherwise drag on, reducing uncertainty about potential liabilities, legal costs and impacts on a company’s stock price — like a referee stopping a game when the outcome is clear.

non-infringement regulatory

"granting MPS’s motion for summary judgment of non-infringement on all patent claims"

Non-infringement is a legal determination or claim that a product, method, or activity does not violate another party’s intellectual property rights, such as patents or copyrights. For investors, it matters because a firm that can show non-infringement faces lower risk of costly lawsuits, sales bans, or damage payments—similar to proving you did not trespass on someone’s land, which protects the business’s operations and value.

federal rule of civil procedure 54(d) regulatory

"agreeing to pay MPS’s court costs pursuant to Federal Rule of Civil Procedure 54(d)"

Federal Rule of Civil Procedure 54(d) says that the winner in a federal civil lawsuit is ordinarily allowed to recover court-related costs from the loser, unless the judge decides otherwise. For investors, this matters because these added legal costs can change the net financial outcome of litigation, influence settlement decisions, and affect the expected cost or recovery from lawsuits—like getting an extra bill or rebate attached to the final score of a dispute.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SCHAFFHAUSEN, Switzerland, April 30, 2026 (GLOBE NEWSWIRE) -- Monolithic Power Systems, Inc. (MPS) (Nasdaq: MPWR), a fabless global company that provides high-performance, semiconductor-based power electronics solutions, announced today the resolution in MPS’s favor of a patent infringement lawsuit filed by Bel Power Solutions, Inc. (“Bel Power”) in the U.S. District Court for the Western District of Texas. As part of the case dismissal, Bel Power agreed to pay MPS’s court costs in the amount of $50,000.

Bel Power had asserted claims of patent infringement against MPS related to six semiconductor patents owned by Bel Power. The Western District Court of Texas ruled in MPS’s favor by granting MPS’s motion for summary judgment of non-infringement on all patent claims. In addition, MPS had initiated ex parte reexamination proceedings at the U.S. Patent and Trademark Office that resulted in the cancellation of four of Bel Power’s patents. After those events, Bel Power agreed to resolve the lawsuit in MPS’s favor by acknowledging that MPS was the prevailing party, and agreeing to pay MPS’s court costs pursuant to Federal Rule of Civil Procedure 54(d) in the amount of $50,000.

MPS was represented by the law firm Perkins Coie LLP in its successful defense of Bel Power’s lawsuit.

About Monolithic Power Systems

Monolithic Power Systems, Inc. (MPS) is a fabless 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 and create a sustainable future. Founded in 1997 by our CEO Michael Hsing, MPS has three core strengths: deep system-level knowledge, strong semiconductor design expertise, and innovative proprietary technologies in the areas of semiconductor processes, system integration, and packaging. These combined advantages enable MPS to deliver reliable, compact, and monolithic solutions that are highly energy-efficient, cost-effective, and environmentally responsible while 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:

Tony Balow
Vice President, Finance
Monolithic Power Systems, Inc.
MPSInvestor.Relations@monolithicpower.com

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Monolithic Power Systems (MPWR) announce on April 30, 2026 about the Bel Power lawsuit?

MPS announced it prevailed in the Bel Power lawsuit with a court ruling of non-infringement. According to Monolithic Power Systems, the Western District of Texas granted summary judgment of non-infringement and Bel Power agreed to pay $50,000 in court costs.

How much did Bel Power agree to pay Monolithic Power Systems (MPWR) after the lawsuit resolution?

Bel Power agreed to pay MPS court costs of $50,000. According to Monolithic Power Systems, that payment was agreed under Federal Rule of Civil Procedure 54(d) as part of the dismissal.

How many Bel Power patents were canceled following USPTO reexamination tied to the MPWR case?

Four Bel Power patents were canceled through ex parte reexamination at the USPTO. According to Monolithic Power Systems, those cancellations preceded the court resolution and affected the asserted patent portfolio.

What was the legal outcome in the Western District of Texas for Monolithic Power Systems (MPWR)?

The court granted MPS’s motion for summary judgment of non-infringement on all patent claims. According to Monolithic Power Systems, that ruling led Bel Power to acknowledge MPS as the prevailing party and settle costs.

Who represented Monolithic Power Systems (MPWR) in the successful defense against Bel Power?

MPS was represented by the law firm Perkins Coie LLP in its defense. According to Monolithic Power Systems, Perkins Coie LLP handled the litigation leading to the favorable summary judgment and cost award.