Conviction: Medium Status: Researching (not held)

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Editorial Note

The 25-year supporting actor stepped into the lead role and the market is finally watching. MPWR is the "scarred and back with pricing power" story of the AI cycle — lost a quarter on Blackwell to Infineon's Vertical Power Delivery, recovered ~50% B300 HGX share by Q3 2025, and is now projected at ~70% Vera Rubin VRM socket share at +60% ASP. The catch: at $1,583 with RSI 75, +42% in 30 days, and a forward P/E of 52x vs a 5y average of 45x, the recovery is priced. KeyBanc's $1,250 PT (now $1,250, raised from $1,050 in Sep) is already through. The trade is no longer "is the comeback real" — it's "what's left after consensus has caught up."

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The Story Right Now

The arithmetic of the last few centimeters is brutal: Blackwell B200 needs ~1,500A on the core rail, Vera Rubin pushes ~2,875A, and to hold 1,500A within 20mV requires a path resistance of ~13 micro-ohms. That's not a taste question, it's physics. NuttyCLD's AI Power Crisis series (six parts, March 30 → May 1) frames MPWR as the protagonist of a 25-year arc that just turned cinematic — the multi-phase VRM, the boring 12V → 0.8V step that nobody cared about for two decades, is now the choke point determining whether NVIDIA's most expensive silicon can actually run at spec. Nutty's intersection metaphor is the cleanest portfolio frame in the whole series: MPS sells the entire traffic-control system at the intersection. Not a single component, not just the controller — the integrated power module, the controller, the DrMOS, the qualification, the supply discipline. That's a different income statement than AOSL ("first into the lane") or Infineon+Delta ("underground entrance").

The lead-change arc is what makes this trade interesting and dangerous at the same time. Hopper had MPS comfortable and dominant. Then GB200 hit 700W+ and the PMIC thermal issues that already existed in Hopper became blocking — Infineon's Vertical Power Delivery (paired with Delta's system integration) won an estimated 60-70% of GB200 PMIC sockets in 2024, with Renesas filling more of the gap. MPS Blackwell exposure cratered, the sell-side repriced, and the stock spent most of 2024 in the doghouse. Then GB300 happened — KeyBanc's September 2025 channel checks said MPS had recovered ~50% B300 HGX share after fixing the thermal architecture, with $900M-cap AOSL emerging as co-leader via OpenVReg reference position. The PT went from $750-ish to $1,050 in one analyst note. By March 2026, KeyBanc raised again to $1,250 on supply-chain work suggesting ~70% Vera Rubin socket share at ASPs ~60% higher than Blackwell — annualizing into 2027 at roughly $420M of incremental revenue and material EPS lift.

Q1 2026 (reported April 30) confirmed the floor. EPS $5.10 vs $4.90 expected, revenue $804.2M vs $782M expected (+26% YoY), and management raised the enterprise data segment growth floor from 50% to 85% YoY — which is the data-center exposure ramping. Q2 guide implies sequential +12% to ~$900M. That print is the first hard read on the Vera Rubin socket-share thesis materializing in the income statement, and it landed clean.

The bottom-line take: the comeback is real, the pricing power is real, the architecture-rotation is real — and so is the 75 RSI. This is not an entry zone, it's a confirmation tape. The deep value moment was Sept 2025 at $750-ish when KeyBanc first raised. The momentum moment was October 2025 when MPS hit a new 52-week high on the KeyCorp upgrade. We're now in the third moment — "AI Power Architect at All-Time Highs" — where the Vera Rubin number is consensus and the asymmetry has compressed. The interesting trades from here are (a) sized starter on a pullback to RSI <55, (b) the more asymmetric peers further down the chain (AOSL, VICR, NVTS), and (c) the Murata MLCC adjacency that nobody talks about yet.

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Quick Snapshot

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Action Matrix

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Price Data

Legend

• RSI 75 = Overbought; FOMO warning
• 52wkHi = -4.7% from peak ($1,661.79 hit intraday April 2026)
• vs SMA20 = +37%, vs SMA50 = +65%, vs SMA200 = ~+90%+ — golden cross intact

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Company Overview

One-Liner

Fabless analog/mixed-signal chipmaker that designs the power management ICs and integrated voltage regulator modules feeding everything from GPUs and EVs to consumer electronics and data-center AI sockets.

Business Model

Key Segments (FY2025)

Geographic Mix

• HQ: Kirkland, Washington; design centers in Asia, Europe, US
• ~4,500 employees worldwide; revenue heavily international (Taiwan/Korea/China customer base)

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Competitive Analysis

Industry Position

Competitive Moat

Competitor Map (the five-company intersection)

Moat Assessment

Moat Width: Wide Moat Trend: Widening (Rubin socket share gain at higher ASP) but architecture-cyclical — the moat resets every NVIDIA generation. Nutty's framing is exactly right: this is not yet a market with a final winner. It is a market where the definition of winning keeps changing from one generation to the next.

The summary in two sentences: MPS has the deepest 25-year supply chain in multi-phase VRMs and the strongest customer relationship at NVIDIA — that's the moat. But every architectural transition (Hopper → Blackwell → Rubin → Feynman) is a new audition, and 2024 proved the moat doesn't make you immune to losing a generation.

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Management Assessment

Leadership

Founder Involvement

Capital Allocation

Red Flags

• Excessive exec compensation — not flagged
• High turnover in key roles — no
• Insider activity bearish — leading indicator shows -$751.9M net insider value over trailing window (mostly automated 10b5-1 sales into the parabolic move; not a panic signal but worth flagging)
• Aggressive accounting — no

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Financials

Key Metrics

Quality Checks

Leading Indicators (current cached read)

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Valuation

Current Multiples (consensus)

Analyst Targets (May 2026)

Fair Value Take

The dispersion is the tell. Consensus PT of $1,294 is below current price. The bull case ($1,500-1,575) is roughly flat. The bear case ($1,000) is the "Q1 was the peak, repricing follows" scenario. Today's price is already pricing the Rubin upside — KeyBanc's $420M of incremental 2027 revenue is in the multiple.

My fair value zone: $1,200-$1,400 for a starter ("price reflects 70% Rubin / +60% ASP, no further upside"); $1,600-$2,000 if Rubin ASP exceeds 60% premium AND Feynman socket position holds (the latter not knowable until 2027).

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Bull Case

1. Rubin socket-share dominance is incumbency, not luck — once you're in spec at 1,500A+ within 13 micro-ohms, switching costs the customer a year of qualification. The ~70% socket projection is a long-cycle asset.

   • Evidence: NVIDIA listed MPS on the 14-vendor 800VDC Kyber partner list; KeyBanc supply-chain work; Q1 enterprise data segment +85% YoY guide.
   • Implication: Rubin revenue contribution is multi-quarter, multi-year — not a one-quarter pop.

2. ASP expansion >> unit growth — the +60% ASP on Rubin VRM is structural, not promotional. More integration (controller + DrMOS + module), more current per socket, more validation cost embedded.

   • Evidence: Morgan Stanley estimates Kyber rack power-solution value rises >10x vs GB200.
   • Implication: revenue and gross-margin trajectory both improve; analog companies with widening GM are rare.

3. Cross-cycle exposure (EV + AI) — the 800V SiC + GaN supply chain that EV built (Porsche/BYD/Hyundai) is now AI's second demand curve. MPS plays both ends.

   • Evidence: BYD 2.11M EVs 1H 2025; auto segment provides ballast even when AI sentiment cools.
   • Implication: Wolfspeed/SiC restructuring story has a second floor MPS sits on top of.

4. Fortress balance sheet, founder-led, decades-long compounder DNA — 17-19% R&D, zero LTD, founder-CEO 28 years in, 2.05% direct ownership.

   • Implication: durable through the next architectural cycle whether MPS wins Feynman socket share or not.

Upside Scenario

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Bear Case

1. Priced for perfection at RSI 75 / forward P/E 52x — Q1 2026 confirmed the thesis, but the Rubin number is consensus. A miss on Q2 guide ($900M) or any softness on enterprise-data ramp triggers repricing on a stock that's +150% in 12 months.

   • How it plays: Q3 2026 earnings disappoints OR competitive update from AOSL/Infineon shifts socket-share narrative; stock retraces to $1,000-1,200 (-25-35%).
   • Probability: Medium

2. Rubin slips to 2027 from late 2026 — production timelines on advanced platforms have slipped repeatedly. NVIDIA Feynman is 2028; Rubin "delayed" is a sentence the market would hate.

   • Probability: Medium

3. Architectural disintermediation (VPD or direct conversion) — Infineon+Delta VPD won the previous cycle. Power Integrations 1,250V/1,700V PowiGaN at 800V input direct-to-1V is the long-term threat. If direct conversion ships at scale on Feynman, MPS becomes the next legacy story.

   • Probability: Low near-term, Medium long-term

4. Insider selling cluster (-$751.9M net) signals top — automated 10b5-1 plans don't usually mean panic, but the cluster size at the parabolic is the pattern that historically precedes 20-30% drawdowns in single names.

   • Probability: Medium for a tactical drawdown; doesn't break the thesis

5. Auto cyclical drag — auto segment growth slowing; if EV demand cools in 2H 2026 the second-curve narrative weakens.

   • Probability: Medium

Thesis Killers

• AOSL or Infineon takes >50% Vera Rubin socket share (would invalidate the KeyBanc thesis)
• Feynman 2028 socket position goes to a competitor (long-cycle bear)
• Operating margin compression below 22% (would signal commoditization)

Downside Scenario

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Market-Moving News

Historical (the lead-change arc)

Recent News (cached)

News Patterns

What moves MPWR: (1) NVIDIA architectural transition signals (any leak/note about socket share), (2) sell-side channel checks (KeyBanc/Barclays/Morgan Stanley), (3) NVDA results / GTC announcements. Sentiment overshoots in both directions on socket-share narrative changes — that's the whole 18-month story.

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Related Markets & ETFs

Sector Context

Whole semis basket is parabolic (per today's full-scan brief: SOXL +50% in 30 days, INTC RSI 87, AMD RSI 79, MRVL RSI 76). MPWR is participating in a sector-wide blowoff, not a stand-alone breakout. Sector rolling over = MPWR rolls with it.

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Cross-References (Where This Appears in Our System)

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Related Tickers to Monitor

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Catalysts & Timing

Upcoming

Key Dates

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Entry Strategy

Position Sizing

My conviction: Medium — thesis is real, comeback is real, valuation is full at the entry tape. Target allocation: 2-3% starter on pullback, scale up if/when Rubin ramp confirms.

Entry Approach

Technical Levels

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Sources

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Research Log

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The Gold

Key Discoveries

Open Questions

• How much of the Q1 +85% enterprise-data guide is Rubin pre-build vs Blackwell sustain?
• What's the Feynman 2028 socket-share read? (TSMC A16 Super Power Rail interaction with VRM topology — does BSPDN make MPS more or less relevant?)
• AOSL co-leader trajectory on Rubin — does the $900M-cap small-co retain reference position, or does NVIDIA consolidate to MPS as Rubin matures?
• Should we open a vrm-pmic watchlist (MPWR, AOSL, VICR, IFNNY, NVTS, POWI, RNECY, ON, ADI, TXN) — Nutty's open question, still open
• The -$751.9M insider net — does a parsed view (10b5-1 vs discretionary) change the signal?