STM

Current Thesis

Laggard auto/industrial semi with delayed SiC ramp, sitting 4 trading days out from the Q1 2026 binary (2026-04-24). Mizuho flipped to Outperform $48 on 2026-04-17 — first major upgrade after 18 months of cuts, which historically marks the street-capitulation bottom. The trade is NOT "buy semis cheap" — it's "ride the post-print re-rating IF Q1 confirms bookings inflection and FY26 guide holds $14B+". Until the print, this is earnings-blackout territory per our core discipline (≤3 trading days → DEFER). Fresh entry today = gambling on a binary; proper play is waiting for the tape to tell us after Friday.

Bull Case

• Mizuho upgrade to Outperform, PT $48 (2026-04-17) — first positive sell-side action in 18 months; street short-interest + downgrade crowd forced to cover on any guide-in-line print.
• FY25 revenue base rebased to $13.3B (down 23% YoY) — easy comps begin Q1; consensus FY26 ~$14.5B only implies +9%, a beat-and-raise on guide gaps to $15B+ consensus within 2 weeks of print.
• SiC design wins disclosed at 2023 CMD: Tesla 4680 inverter, Renault Ampere, Stellantis STLA platform — revenue ramp back-end loaded into 2H 2026; Q1 commentary on SiC booked backlog is the tell.
• Italian Chips Act €2B subsidies to Catania SiC fab + Crolles-2 JV with GFS — capex-light relative to reported 200mm SiC capacity; 2026 depreciation cliff already in P&L.
• EUR/USD tailwind: STM reports in USD, cost base EUR — every 5-cent EUR weakness = ~200bps gross margin; 2026 ECB cutting cycle > Fed is structural support.
• Institutional positioning: STM net-short in EU hedge fund consensus baskets per JPM prime brokerage data Q4 2025 — gamma squeeze risk into a clean print.

Bear Case

• China SiC wafer ASPs down 30%+ YoY through 2025 (SICC, TankeBlue capacity flood) — STM SiC gross margin likely compressing before scale arrives; Infineon pre-announced 2026-03 SiC margin reset to mid-teens from mid-20s.
• Apple ToF/LiDAR socket risk: Sony dual-sourcing since 2024 reporting, ~$700M revenue exposure; design-out window is iPhone 18 cycle (2026-09 ramp) — any call commentary = -5% single-day event.
• Automotive MCU price war intensifying: Infineon AURIX TC4x + onsemi Treo platform competing on ASPs; STM guided auto margin mid-teens vs. prior 20%+ at Q4 2025 call.
• FY25 -23% YoY was a real cyclical capitulation, not a soft patch — tier-1 OEM destock may not be complete if EV demand stays weak through Q2 (Stellantis, VW production cuts in March 2026).
• ADR (STM) trades at sustained premium to Paris ordinary (STMPA.PA); ~2–4% arb spread unwinds if EU-flow reverses, purely technical downside for ADR holders.
• Mizuho upgrade IS the late signal — when the last skeptic flips 4 days before print, the cheap optionality is gone; proper setup would have been entry in March.

Setup & Price Structure

• No intraday print provided this session. Operational structure (from prior notes): $30 is the 2025 breakdown shelf / key resistance-turned-reference. Mizuho PT $48 implies 60%+ upside if trend re-establishes.
• Watch for post-earnings structure: a bullish setup requires a weekly a daily close below the thesis-invalidation level on volume >3× ADV with follow-through day 2 — that's the institutional re-rating signal. Without that, the upgrade is a fade.
• Pre-print: expect pinning between $28–$32 as dealers hedge earnings gamma. Any gap >$35 pre-print with no news = someone front-running a leak (don't chase).
• Relative strength vs. SOX: STM has been in a persistent RS downtrend since mid-2024. Inflection requires 20-day RS reading above 0 post-earnings. Until then, buying laggards in a semi tape led by NVDA/AVGO/TSM is fighting the ribbon.
• Invalidation level for a post-earnings long: weekly close back below $28 = trend never resumed, exit.

Catalyst Calendar (next 30 days)

• 2026-04-24 (Fri, est.): Q1 2026 earnings — historically last Thursday/Friday of April per prior years. Four trading days from today. BINARY. Key prints to watch: revenue vs. $3.2B consensus, auto segment book-to-bill (prior disclosure Q4 2025 was "approaching 1.0"), SiC revenue line item, FY26 guide vs. ~$14.5B consensus.
• 2026-04-24 (same day, post-close call 09:00 CET next day): Management commentary on China SiC ASPs, Apple socket visibility, Catania utilization. Tone is worth 5–10% single-day.
• ~2026-05-05 to 2026-05-09: Post-earnings sell-side circuit (JPM TMC, BofA Global Auto) — ratings momentum window. If Q1 confirms, expect 2–4 follow-on upgrades within 10 days.
• ~2026-05-12 to 2026-05-15: Infineon Q2 FY26 print (Infineon FY ends September, their Q2 = calendar Q1) — direct read-through on European auto/SiC demand; binary risk for STM held positions.
• ~2026-05-28 (est.): onsemi Q1 print — direct SiC + auto power comp; negative tone = STM sells off in sympathy.

What Would Change Our Mind

• Bull kill (pre-print DEFER → SKIP): Infineon or onsemi pre-announces SiC ASP cut >15% before 2026-04-24 — margin thesis dead, don't enter post-print either.
• Bull kill (post-print exit): Q1 2026 revenue <$3.15B OR FY26 guide cut below $14B — confirms destocking not over; if somehow long, market-sell at open, no averaging down.
• Bull kill (structural): STM closes weekly below $28 at any point post-earnings — trend re-broken, thesis dead for the cycle.
• Bull confirm (ADD trigger post-print): Q1 book-to-bill disclosed >1.05 AND automotive segment revenue Q/Q positive AND FY26 guide raised to $15B+ — inflection confirmed, scale to HIGH conviction on day-2 follow-through.
• Structural tell (entry trigger): STM closes >[entry redacted] on earnings day with volume >3× ADV and holds >$34 day +1 — institutional re-rating underway, clean entry setup.
• Narrative death: Apple formally announces Sony as sole ToF supplier for iPhone 18 (expected 2026-06 supply chain leaks) — -$700M revenue gap, reset lower.

Correlation Notes

• ON (onsemi): Direct SiC + auto power comp; tightest 60-day correlation ~0.75. Any ON pre-announcement is immediate read-through.
• IFX.DE (Infineon): European auto/industrial peer; calendar Q1 print 2026-05-12 (est.) is the next European data point post-STM.
• SOXX / SOX: STM has been a SOX underperformer for 6 quarters; RS inflection is the real confirmation signal, not absolute price.
• NXPI: Auto MCU peer, prints ~2026-04-28. Secondary confirmation of auto destock narrative.
• MCHP: Third auto/industrial tell; broken tape, any MCHP bounce co-moves with STM.
• EUR/USD: Inverse correlation to STM revenue beats on translation; sub-1.05 EURUSD = structural tailwind we want to see persist.
• Theme cluster: Trades with semicap-equipment laggards (AMAT, LRCX have held up better); if AMAT rolls over, STM has no air cover.

Operator Notes (Rusty)

• Pre-earnings posture: DEFER any fresh entry until 2026-04-24 print clears. No probe trades inside the 3-day earnings window.
• If we do enter post-print on a clean follow-through, start LOW (1–2%) and scale to MEDIUM only on 2-day follow-through + RS inflection.
• This is NOT a fat pitch even if the print is clean — it's a cyclical laggard rotation. Parabolic mania unlikely; realistic target is $40–45 by end-Q2 if everything works.
• Never average down below $28 post-print. If the print fails, thesis is dead for the cycle — re-evaluate in July when Q2 prints.