Last refreshed: July 21, 2026 (US ET)
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MPWR

Growth

MONOLITHIC POWER SYSTEMS INC

Information Technology·SemiconductorsYield: Low (<1%)

Monolithic Power Systems, Inc. provides semiconductor-based power electronics solutions in China, Taiwan, South Korea, Southeast Asia, Europe, the United States, Japan, and internationally. The company offers direct current (DC) to DC solutions to convert and control voltages within a range of electronic systems, such as cloud-based and on-premises CPU servers and workstations, AI systems, memory, storage solutions, notebooks, infotainment, power sources, home appliances, network infrastructure, and satellite communications. It also provides alternating current (AC) to DC; driver metal-oxide-semiconductor field-effect transistors; power management integrated circuits (ICs); and current limit switch and lighting control products.

Close · 3M

+25.12%

MPWR · 3M

+25.12%

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Held by 3 AI ETFs

PQUS0.590%

as of Jul 21

QRFT0.140%

as of Jul 8

AMOM0.030%

as of Jul 17

Signal performance

Each tracked ETF's moves on this stock, grouped by fund. Returns are measured from the signal date to the latest close — hypothetical, no commissions or slippage.

Buy signals10
Win rate60% (6/10)
Avg buy return-0.07%
PQUSnow 0.590% of fund9 signals

PQUS · Weight increase · 2d

MPWR demonstrates a PER of 96.19 and a PBR of 12.3, alongside 23.9% revenue growth and a 19.21% ROE, indicating the underlying growth characteristics that Pictet Asset Management's AI ranking system for PQUS may prioritize within its US large-cap universe. This AI-managed fund increased its allocation to MPWR consecutively from 0.59% to 0.60% on July 16th and 17th, 2026, a move that aligns with the stock's 30-day return of -22.7% which brought its current price of $1305.65 to 77% of its 52-week high. Despite the recent short-term price decline, the AI system, which applies sector-balance and concentration rules within its measured turnover strategy, likely identified value or sustained longer-term strength in MPWR's fundamentals, as reflected by its 90-day return of 22.9% and 1-year return of 72.1%.

weight 0.560% → 0.600% (+0.040 pp)·stock down 12.5% in the 30 days before

Jul 17·entry $1312.00·now $1328.80Fresh

+1.28%
since Jul 17

PQUS · Weight increase · 2d

PQUS, managed by Pictet Asset Management, employs an AI ranking system for its roughly 165 US large-cap holdings, executing periodic rebalances rather than daily adjustments. The consecutive weight increase for MPWR from 0.60% to 0.63% between June 30th and July 2nd reflects one such reallocation by the AI. This adjustment suggests the AI system identified a compelling opportunity in MPWR, likely viewing its 30-day return of -9.3% as a temporary dip against a backdrop of 23.9% revenue growth. Such a move aligns with the fund's measured turnover and sector-balance rules, positioning MPWR within its selective portfolio based on the AI's assessment.

weight 0.600% → 0.630% (+0.030 pp)·stock down 20.7% in the 30 days before

Jul 2·entry $1288.16·now $1328.80Drifting

+3.15%
since Jul 2

PQUS · Weight decrease · 2d

Pictet Asset Management’s AI ranking system, which manages PQUS’s portfolio of approximately 165 US large-cap holdings with periodic rebalances, appears to have modestly de-emphasized MPWR. The consecutive weight decrease from 0.69% to 0.64% over three days suggests the AI system adjusted the stock’s ranking. This recalibration likely factored in the company’s elevated PER of 100.82, indicating a high valuation, even as the stock experienced a 10.3% decline in its 30-day return. Such a measured adjustment aligns with the fund’s stated style of US large-cap management with measured turnover, reflecting the system’s ongoing evaluation of holdings within its universe.

weight 0.690% → 0.640% (-0.050 pp)·stock down 13.5% in the 30 days before

Jun 25·entry $1438.30·now $1328.80

-7.61%
since Jun 25

PQUS · Weight decrease · 2d

PQUS, which employs an AI ranking system for its approximately 165 US large-cap holdings, appears to be recalibrating its position in MPWR during its periodic rebalance. The observed consecutive weight decrease for Monolithic Power Systems, falling from 0.66% to 0.65%, indicates the AI's re-evaluation. This adjustment likely reflects the AI system processing MPWR's current valuation context, where the stock carries a high PER of 112.83. Despite its significant revenue growth, such a valuation may prompt the AI to reduce exposure in favor of other opportunities within its sector-balanced portfolio.

weight 0.730% → 0.650% (-0.080 pp)·stock up 6.5% in the 30 days before

Jun 19·entry $1537.88·now $1328.80

-13.60%
since Jun 19

PQUS · Weight decrease · 2d

Currently priced at $1589.55, MPWR sits at 94% of its 52-week high, having delivered a significant 1-year return of +140.1% and +36.5% over 90 days, despite a recent -1.5% 30-day return. This elevated price trajectory likely prompted the AI ranking system of the Pictet-managed PQUS to initiate a reduction in its holding. The consecutive weight decreases from 0.75% to 0.67% between June 5th and June 7th, part of a broader adjustment down to 0.68% by June 12th, align with the fund's measured turnover and periodic rebalancing approach. While MPWR demonstrates a 23.9% revenue growth and 19.21% ROE, its high PER of 109.98 and PBR of 12.3 suggest a valuation level that the AI system, operating under its sector-balance and concentration rules, systematically de-risked from within its US large-cap universe.

weight 0.700% → 0.680% (-0.020 pp)·stock down 4.4% in the 30 days before

Jun 12·entry $1577.32·now $1328.80

-15.76%
since Jun 12

PQUS · Weight decrease · 2d

weight 0.750% → 0.670% (-0.080 pp)·stock down 10.4% in the 30 days before

Jun 7·entry $1559.18·now $1328.80

-14.78%
since Jun 7

PQUS · Weight decrease · 2d

The AI ranking system governing PQUS’s portfolio of approximately 165 US large-cap holdings likely re-evaluated MPWR’s standing during a periodic rebalance. MPWR’s substantial 1-year return of 144.6% brought its valuation multiples, such as a PER of 111.58, into sharp focus for the AI. This high valuation, alongside its recent price surge, could have prompted the AI to reduce exposure to maintain PQUS’s overall sector-balance and concentration rules within its US large-cap universe. The observed consecutive weight decrease from May 16 to May 21 aligns with the fund’s periodic rebalance cadence and its stated style of measured turnover, reflecting a methodical adjustment rather than an abrupt exit.

weight 0.740% → 0.700% (-0.040 pp)·stock up 2.6% in the 30 days before

May 21·entry $1561.25·now $1328.80

-14.89%
since May 21

PQUS · Weight decrease · 2d

The Pictet Asset Management AI-managed PQUS, which implements periodic rebalances across its ~165 US large-cap holdings, adjusted its allocation to MPWR during a scheduled review around May 16th. This consecutive weight decrease suggests the AI ranking system reassessed the stock's position within its portfolio, potentially influenced by its significant price appreciation. Specifically, Monolithic Power Systems' 1-year return of +148.9%, pushing its price to 93% of its 52-week high, likely signaled an altered risk-reward profile to the AI. Such a rapid ascent, alongside a high PER of 111.84, would prompt a re-evaluation to maintain the fund's desired sector-balance and concentration parameters.

weight 0.820% → 0.740% (-0.080 pp)·stock up 10.5% in the 30 days before

May 17·entry $1486.33·now $1328.80

-10.60%
since May 17

PQUS · Weight decrease · 2d

The AI ETF is likely decreasing its MPWR weight due to its extremely high valuation metrics, such as a PER of 119.95 and PBR of 12.3, even with strong revenue growth and ROE. This suggests the algorithm perceives the stock as overvalued or its growth trajectory may not justify such a premium, signaling increased risk. Retail investors should carefully consider if the company's robust growth can sustainably support its elevated valuation, as rich multiples can lead to significant corrections if performance falters.

weight 0.730% → 0.670% (-0.060 pp)·stock up 52.3% in the 30 days before

Apr 29·entry $1526.84·now $1328.80

-12.97%
since Apr 29
QRFTnow 0.140% of fund5 signals

QRFT · Weight decrease · 2d

QRFT's AI manager has incrementally reduced its allocation to Monolithic Power Systems, demonstrating a consecutive weight decrease over multiple weekly rebalances, moving from 0.17% to 0.14% in less than two weeks. This calibrated, gradual adjustment aligns with the fund’s method of combining traditional factors with proprietary alternative-data overlays, facilitating continuous portfolio refinement. The fund's decision to trim MPWR's position, even as the stock sits at 78% of its 52-week high following a 30-day return of -15.3%, likely stems from a blend of signals. High valuation metrics, such as a PER of 100.82, coupled with recent negative short-term price momentum, appear to outweigh the stock's longer-term gains and existing fundamental quality indicators like 19.21% ROE. Such a nuanced, multi-factor rebalancing strategy is characteristic of Qraft's broad large-cap core approach.

weight 0.160% → 0.140% (-0.020 pp)·stock down 19.6% in the 30 days before

Jun 29·entry $1312.77·now $1328.80

+1.22%
since Jun 29

QRFT · Weight increase · 2d

weight 0.160% → 0.180% (+0.020 pp)·stock up 7.4% in the 30 days before

Jun 3·entry $1689.89·now $1328.80Fresh

-21.37%
since Jun 3

QRFT · Weight decrease · 2d

The AI likely initiated a consecutive weight decrease for MPWR due to its extremely high PER and PBR, suggesting a rich valuation despite strong revenue growth and ROE. This pattern indicates a cautious de-risking strategy, signaling that the stock's current price might be overextended relative to its fundamentals. For retail investors, this highlights the importance of balancing a company's growth prospects with its current valuation to avoid overpaying, even for high-quality firms.

weight 0.190% → 0.170% (-0.020 pp)·stock up 42.8% in the 30 days before

Apr 28·entry $1504.08·now $1328.80

-11.65%
since Apr 28

QRFT · Accumulation · 3d

stock up 9.4% in the 30 days before

Apr 6·entry $1180.03·now $1328.80Chased

+12.61%
since Apr 6

QRFT · New entry · 1d

stock down 9.1% in the 30 days before

Mar 20·entry $1068.85·now $1328.80Chased

+24.32%
since Mar 20
AMOMnow 0.030% of fund11 signals

AMOM · Weight decrease · 2d

The weight adjustments for MPWR in AMOM reveal a nuanced, gradual reduction in exposure, culminating in consecutive daily decreases from 0.27% to 0.25% by the period's end. This measured scaling back aligns with MPWR's recent 30-day return of -18.6%, indicating Qraft Technologies' multi-signal composite detected a weakening in the stock's immediate upward price trajectory, even considering its substantial longer-term performance. For an ETF designed to pick names expected to extend their runs, a decline of nearly one-fifth in a month, especially for a company trading at a price-to-earnings multiple exceeding 100, would likely temper the conviction signals for sustained near-term growth. Such precise, incremental recalibrations are afforded by the weekly rebalancing mechanism, as the AI manager continuously evaluates whether MPWR at its $1313.32 current price still demonstrates the specific momentum characteristics sought for its concentrated portfolio.

weight 0.280% → 0.250% (-0.030 pp)·stock down 18.9% in the 30 days before

Jun 26·entry $1313.32·now $1328.80

+1.18%
since Jun 26

AMOM · Weight decrease · 2d

AMOM has been implementing a stepped reduction in its Monolithic Power Systems allocation, moving from 0.32% to 0.27% over two weeks in June 2026. This deliberate de-weighting reflects Qraft Technologies' multi-signal momentum composite detecting a probable end to MPWR's run extension potential. While the stock delivered a +94.5% one-year return and +23.2% over ninety days, its recent -14.3% decline in the last 30 days, bringing the price to $1423.76 (84% of its 52-week high), indicates a weakening in the critical price trend signal. Within AMOM's concentrated momentum sleeve, such a systematic reduction confirms the AI's algorithm no longer finds sufficient conviction for the stock's continued upward trajectory, especially considering its PER of 100.82.

weight 0.290% → 0.270% (-0.020 pp)·stock down 8.8% in the 30 days before

Jun 23·entry $1423.76·now $1328.80

-6.67%
since Jun 23

AMOM · Weight decrease · 2d

The weight for MONOLITHIC POWER SYSTEMS in AMOM exhibited a series of subtle reductions from 0.31% to 0.28% over recent days, following a slight peak and subsequent hold earlier in the week. This measured reduction in allocation, even with MPWR currently trading at $1563.70 and near its 52-week high after a 90-day return of +36.9%, suggests AMOM's multi-signal momentum composite is detecting a waning expectation for further upward extension, rather than a mechanical divestment based on simple price tops. Given AMOM's focus on identifying stocks expected to extend their runs within its concentrated momentum sleeve, the system likely processed MPWR's recent 30-day negative return of -0.8% alongside its high valuation metrics, such as a PER of 112.83, indicating a shifting momentum outlook despite a 23.9% revenue growth. The deliberate, measured decrease aligns with AMOM's design where position changes carry conviction, adjusting exposure to a company as its comprehensive momentum signals evolve.

weight 0.310% → 0.280% (-0.030 pp)·stock down 2.6% in the 30 days before

Jun 17·entry $1448.21·now $1328.80

-8.25%
since Jun 17

AMOM · Weight increase · 2d

weight 0.010% → 0.320% (+0.310 pp)·stock up 7.4% in the 30 days before

Jun 3·entry $1689.89·now $1328.80Fresh

-21.37%
since Jun 3

AMOM · Sudden change · 1d

Monolithic Power Systems saw its weight in the AMOM ETF suddenly increase from a sustained 0.01% to 0.31% on June 2, 2026, marking a significant stepped re-allocation. This upward adjustment aligns with AMOM's mandate to identify companies expected to extend their runs, as MPWR has delivered a 52.8% 90-day return and a 132.1% 1-year return, currently trading at 98% of its 52-week high. The ETF's concentrated momentum sleeve, where position changes denote conviction, likely integrated MPWR's 23.9% revenue growth and 19.21% ROE as positive fundamental momentum signals. This substantial weight addition suggests AMOM’s multi-signal composite has identified convergent trends across price and potentially other fundamental or alternative data, indicating a sustained positive trajectory for the Information Technology firm.

weight 0.010% → 0.310% (+0.300 pp)·stock up 2.6% in the 30 days before

Jun 2·entry $1624.99·now $1328.80

-18.23%
since Jun 2

AMOM · Weight decrease · 2d

The AI ETF likely reduced and then near-totally exited MPWR due to its extremely high valuation multiples, specifically a P/E of 115.15 and P/B of 12.3, signaling an elevated risk profile despite good revenue growth. This action suggests the AI prioritized risk management against potential market corrections for overvalued assets. A practical takeaway for retail investors is to carefully assess valuation metrics alongside growth, understanding that even strong companies can present significant risk if their stock price is unsustainable.

weight 0.280% → 0.010% (-0.270 pp)·stock up 40.7% in the 30 days before

May 4·entry $1573.30·now $1328.80

-15.54%
since May 4

AMOM · Weight increase · 2d

The AI likely increased MPWR's weight due to its robust 23.9% revenue growth and 18.06% ROE, signaling strong underlying business momentum despite high valuation multiples. This indicates the AI prioritizes growth and profitability, anticipating continued strong performance. For retail investors, this highlights the AI's strategy of favoring high-growth companies even at premium valuations, but necessitates thorough research into the sustainability of such growth to justify the extremely high PER of 114.22.

weight 0.260% → 0.280% (+0.020 pp)·stock up 47.7% in the 30 days before

Apr 30·entry $1614.41·now $1328.80Fresh

-17.69%
since Apr 30

AMOM · Weight decrease · 2d

The AI ETF likely initiated consecutive weight decreases for MPWR due to its extremely high valuation multiples, notably a PER of 118.57 and PBR of 12.3, indicating a perceived overvaluation despite strong revenue growth. This sustained reduction suggests the AI is actively de-risking the position. For retail investors, this underscores the importance of scrutinizing valuation alongside growth potential, as even fundamentally strong companies can carry increased risk when their stock prices become stretched.

weight 0.280% → 0.260% (-0.020 pp)·stock up 42.8% in the 30 days before

Apr 28·entry $1504.08·now $1328.80

-11.65%
since Apr 28

AMOM · Weight increase · 2d

stock up 43.0% in the 30 days before

Apr 21·entry $1527.95·now $1328.80Fresh

-13.03%
since Apr 21

AMOM · Weight increase · 2d

stock up 9.4% in the 30 days before

Apr 6·entry $1180.03·now $1328.80Chased

+12.61%
since Apr 6

AMOM · New entry · 1d

stock up 1.8% in the 30 days before

Apr 2·entry $1118.49·now $1328.80Chased

+18.80%
since Apr 2

Sell signals show what the stock did after the AI exited. A negative number means the AI's exit was well-timed.

Buffett-style framework

Too hard to callas of Apr 29

AI ETFs AMOM and QRFT are showing slight weight decrease trends in MPWR, while PQUS maintains a holding. My analysis concludes the company is 'Too Hard' to assess within a Buffett-style framework due to unpredictable cash flows, suggesting a fundamental disagreement on the ability to project long-term value compared to an AI's algorithmic selection. The AI's slight reduction in exposure might align with a cautious stance, but the framework's 'Too Hard' verdict points to an intrinsic difficulty in valuing the business itself.

  • Circle of CompetenceThe rapidly evolving technology sector and fast product cycles within the semiconductor industry make long-term cash flow projections genuinely unpredictable for this business.
  • Economic MoatFurther analysis of competitive advantages is not possible as the business falls outside the circle of competence.
  • ManagementAssessment of management's capital allocation and integrity cannot be completed for businesses outside the circle of competence.
  • Financial HealthDetailed financial health metrics are not assessed when the predictability of the business model is uncertain.
  • Margin of SafetyA margin of safety cannot be determined for a business whose intrinsic value is too difficult to forecast reliably.

MONOLITHIC POWER SYSTEMS INC operates in a dynamic segment of the information technology sector, making it difficult to confidently project its unit economics and cash flows over a ten-year horizon. This inherent lack of predictability places the company outside the defined circle of competence, leading to a verdict that it is 'Too Hard' to evaluate using this framework. Consequently, further stages of the analysis regarding moats, management, financial health, and margin of safety cannot be meaningfully applied.

Educational interpretation generated by AI applying frameworks Warren Buffett documented in his shareholder letters and other public writings. Not a statement by Mr. Buffett or Berkshire Hathaway, and not investment advice.