X-FAB Silicon Foundries SE

Snapshot

Ticker: EPA: XFAB
Price: €13.18 post +38% on 27-May-2026 (intraday €15.88, +76%); 52-wk low ~€4 [S13][S14]
Market cap: ~€1.72bn (~US$1.9bn) at €13.18; touched ~€2.06bn intraday — retail-driven spike, no fundamental catalyst [S13][S14]
Revenue: US$870.3m FY2025 (+7%); US$195.6m Q1 2026 (−4% YoY) [S3][S4][S5]
Growth: FY2025 +7%; Q1 2026 −4% YoY; no full-year 2026 guidance issued [S5]
Profitability: FY2025 EBITDA US$196.8m (22.6%); EBIT US$76.4m (8.8%); Q1 2026 EBITDA margin 17.5% — compressing [S3][S5]
FCF: FY2025 ~−US$60m (operating CF $144m less capex $204m); 23% capex/sales [S6]
Net cash / debt: net debt ~US$273m (cash US$194m, total debt ~US$467m, end-2025) [S6]
Valuation: pre-spike ~1.0–1.2x EV/Sales / ~3.7–5.2x EV/EBITDA; post-spike ~2.5x EV/Sales, ~11x EV/EBITDA; consensus analyst PT €5.29 — i.e. ~60% below current price [S13][S20]
Currency: USD (reports in USD); listed in EUR
Geography: global; ~94% auto/industrial/medical mix
What: specialty analog/mixed-signal foundry — SiC, MEMS, automotive
Value chain: foundry — wafer fabrication (analog/mixed-signal, SiC)
End markets: automotive, industrial, medical (DNA sequencing, ultrasound)
Founded / HQ: 1992 / Erfurt, Germany (Belgian-rooted)
CEO: Damien Macq (from Feb 2026, ex-Melexis Sense & Light BU, succeeding Rudi De Winter)
Top competitors: Tower Semiconductor, GlobalFoundries, UMC, TSMC, onsemi (SiC IDM), STMicro (SiC IDM), Wolfspeed (SiC IDM)
Key customers: Melexis (~45% of FY2023 revenue), Goodix, Lite-On, Micronas (TDK), Sensata, IDT, Knowles Electronics
Key suppliers: silicon & SiC substrates, equipment (Soitec SmartSiC partner at Lubbock), specialty materials
Catalyst: FY2026 guidance update; new-CEO strategic refresh; Sarawak cleanroom full ramp by Q4 2026
Verdict: Profitable specialty foundry levered to SiC/MEMS, but margin-compressing, FCF-negative, no FY26 guidance — retail-driven spike priced at ~60% above consensus PT
Confidence: 0.45

Executive summary

X-FAB is a profitable European specialty foundry for analog/mixed-signal chips with growth engines in silicon carbide (SiC) power, MEMS/microsystems, and medical silicon. FY2025 grew 7% to US$870.3m at a 22.6% EBITDA margin; MEMS topped US$100m for the first time, medical hit a record €71m (+26%), SiC rebounded strongly (Q4 +77% YoY, Q1 2026 wide-bandgap +152% YoY, wafer shipments nearly tripled) [S3][S4][S5][S8]. Core auto/industrial/medical is 94% of sales [S4]. Damien Macq took over as CEO in February 2026, succeeding long-time CEO Rudi De Winter — a leadership transition to monitor alongside the SiC ramp and capex profile [S15].

Three things make the picture more complicated than the headline 22.6% margin: (1) margin trajectory is downward — 27.1% (FY23) → 23.1% (FY24) → 22.6% (FY25) → 17.5% (Q1 26), with no FY26 guidance issued [S1][S2][S3][S5]; (2) free cash flow was −US$60m in FY2025 on US$204m of capex (23% of sales) and net debt of US$273m [S6]; and (3) Melexis is ~45% of revenue [S25][S26], and Q1 2026 automotive revenue was already −10% YoY [S5]. A Q4 2025 US$9.3m one-off from a renegotiated SiC raw-wafer long-term agreement and inventory revaluation reset Q4 margins lower than headline would suggest [S3].

On 27-May-2026 the stock spiked +76% intraday to €15.88 (settled +38% at €13.18) on a viral X post framing X-FAB as a photonics/power-semi play — no company news, no analyst upgrade. YTD +141%. Consensus 12-month analyst price target is €5.29 [S13] — i.e. roughly 60% below current spot — making the move retail-driven and reversion-prone.

Verdict: genuinely profitable specialty foundry levered to SiC, MEMS and medical — but margin- and capex-cyclical with limited visibility, and a Melexis-concentration risk into a soft auto cycle. Confidence: 0.45

1. Company overview

Erfurt-based specialty foundry (founded 1992, Belgian heritage via the Melexis/Xtrion shareholder structure); FY2025 revenue US$870.3m, EBITDA margin 22.6% [S3]. Differentiates on analog/mixed-signal, SiC and MEMS process platforms for safety-critical auto / industrial / medical end-markets — not leading-edge digital. Customer base ~400 companies, FY2024 geography Europe ~67%, Asia ~23% (China ~12.6%), North America ~9.5% [S25]. Listed on Euronext Paris.

2. Management & founders

Damien Macq became CEO in February 2026, succeeding long-time CEO Rudi De Winter; Macq was COO since 2023, ex-Melexis (Sense & Light BU) [S15]. The Melexis link is structural — historical shared major shareholder Xtrion NV, although per X-FAB’s H1 2024 disclosure Xtrion ceased to be a controlling shareholder of Melexis [S27]. Free float ~38–42% [S28]. The leadership transition is the operational watch-item for 2026 alongside the SiC capex profile.

3. Business model & products

Pure-play specialty foundry — fabs what others design — focused on analog/mixed-signal CMOS, SiC, MEMS processes for customers that need reliability, traceability, automotive qualifications and long-life process support rather than leading-edge nodes. Production sites: Erfurt (Germany), Itzehoe (Germany), Dresden (Germany), Corbeil-Essonnes (France), Lubbock TX (USA — SiC), Kuching (Sarawak, Malaysia — 180nm BCD-on-SOI). New Sarawak cleanroom inaugurated September 2025; doubles 180nm BCD-on-SOI capacity, lifting site to 40,000 wafer starts/month at full ramp by Q4 2026 (total Sarawak program ~RM3bn / ~US$600m) [S10][S11]. Lubbock site received a US$50m CHIPS Act SiC award and runs a Soitec SmartSiC partnership [S12].

4. Financial analysis

US$ m	FY2023	FY2024	FY2025	Q1 2026
Revenue	906.8	816.4 (−10%)	870.3 (+7%)	195.6 (−4% YoY, −12% QoQ) [S1][S2][S3][S5]
EBITDA	245.6	188.9	196.8	34.2
EBITDA margin	27.1%	23.1% (23.5% ex-IFRS 15)	22.6%	17.5% (18.4% ex-IFRS 15)
EBIT	—	—	76.4 (8.8%)	—
Capex	—	—	204.1 (vs $250m initial plan)	(2026 plan ~$100m) [S6]
Operating cash flow	—	—	144.1 [S6]	—
Free cash flow	—	—	~−60 (OCF 144 less capex 204) [S6]	—
Cash	—	—	194.3 (+$20.1m QoQ) [S6]	—
Total debt	—	—	~467 [S6]	—
Net debt	—	—	~273 [S6]	—

FY2025 segment / technology split: Core (auto + industrial + medical) 94% of revenue at US$814.2m, +7% YoY [S4]. Automotive ~US$540m+ (Q1 2026 auto US$121.6m, −10% YoY [S5]). Industrial +19% YoY [S4]. Medical record €71m / ~US$77m (+26%; Q3 +74%, Q1 2026 US$19.2m +39%) [S4][S7][S5]. MEMS >US$100m for the first time, +11% YoY [S8]. SiC full-year only US$33.8m (−34% off a 2024-Q1 peak), but Q4 +77% YoY; Q1 2026 wide-bandgap +152% YoY, SiC wafer shipments nearly tripled [S3][S9]. Q4-only QoQ SiC revenue +6% despite wafer starts +60% — higher share of customer-supplied substrates (lower pass-through billings) [S3].

Q4 2025 profitability hit by a US$9.3m one-off — US$6.0m from renegotiating a long-term SiC raw-wafer agreement, US$3.3m from inventory revaluation at the lower renegotiated price [S3]. Q2 2026 guide: revenue US$190–200m, EBITDA margin 17–20%. No full-year 2026 guidance — auto recovery expected H2 2026 [S5].

5. Sector & market context

Sub-market	2025 size	CAGR	Source
Analog/mixed-signal wafer foundry	US$15.0–15.9bn	~6.5–7.5% to mid-$20bn by 2033/34	[S16]
Specialty foundry (broader)	US$11.65bn	~12.8% to US$38.85bn by 2035	[S16]
SiC power semiconductors	US$2.7bn (range $1.8–4.0bn)	mid-to-high teens %	[S17]
MEMS foundry service	~US$0.85bn	~6–8% to US$1.3–1.7bn by 2033/34	[S18]
MEMS sensor end-market	US$18.6bn	~8–10% to US$29–43bn by 2031/34	[S18]

The strategic question — SiC opportunity for X-FAB: The top 5 IDMs (Infineon, STMicro, onsemi, Wolfspeed, ROHM) hold >90% of global SiC revenue [S17] — STM alone ~32.6% share, onsemi ~25%, Wolfspeed ~11%. X-FAB is a pure-play foundry, not an IDM, addressing the fabless / second-source sliver — customers who don’t want to fab in-house or want a dual-source. With FY2025 SiC at US$33.8m, X-FAB’s share of the US$2.7bn SiC market is ~1.2%. Realistic addressable opportunity is the merchant-foundry slice (maybe US$200–400m today). Wolfspeed emerging from Chapter 11 in September 2025 (US$4.6bn of $6.7bn debt cut) [S19] reshuffles the field but also signals SiC over-build risk.

6. Competitive landscape

Player	Model	Revenue	EV/Sales	EV/EBITDA	Notes
X-FAB	Pure-play specialty foundry	US$870m FY25	pre-spike ~1.0–1.2x [S20]; post-spike ~2.5x	~3.7–5.2x → ~11x post-spike	EU-rooted; SiC + MEMS + analog
Tower Semiconductor	Specialty foundry (indep. post-Intel)	US$2.0bn (last FY) [S21]	~17x (post AI-foundry rally)	~50x	Direct rival; thematic premium
GlobalFoundries	Specialty + mainstream	~US$6.7bn FY24 [S22]	mid-single x	~10x	Larger, more diversified
UMC	Mainstream + specialty	US$7.5bn FY25 [S23]	2.4x	5.6–5.8x	Asian foundry comp
TSMC	Leading-edge	US$90bn+	—	—	Different league
onsemi	SiC IDM	~US$7bn	—	—	Vertically integrated
STMicro	SiC IDM (leader, 32.6% share)	US$13bn+	—	—	Vertically integrated
Wolfspeed	SiC IDM (post-Ch.11)	US$807m (FY25e)	—	—	Re-emerged Sep 2025 after 70% debt cut [S19]

The Tower comp is distorted (Intel’s US$5.4bn deal terminated August 2023 over China antitrust; Tower received a US$350m breakup fee and has since rallied to ~US$30bn market cap on its own [S21][S24]). Cleaner reference points: UMC (5.6x EBITDA) and GFS (~10x). Pre-spike X-FAB at ~4–5x EBITDA was a clear discount; post-spike at ~11x it has converged with UMC/GFS — not yet a premium, but the move is retail-driven, not earnings-driven.

7. Top customers and concentration risk

Melexis — by far the largest. FY2023 sales to Melexis ~US$364m, ~45% of X-FAB revenue [S25][S26]. Melexis is an automotive sensor chip designer.
Other named customers from industry compilations (not all directly disclosed): Goodix, Lite-On, Micronas (TDK), Sensata, IDT, Knowles Electronics [S25].
Total customer count: >400 [S25].

Melexis concentration is the single biggest specific bear-case risk — see Section 9.

8. Growth drivers & catalysts

SiC wafer shipments nearly tripled YoY in Q1 2026, wide-bandgap +152% — real ramp acceleration [S5][S9].
MEMS >US$100m for the first time in FY2025; record medical €71m [S4][S8].
Sarawak cleanroom full ramp by Q4 2026; +33% wafer-starts capacity [S10][S11].
CHIPS Act US$50m award + Soitec SmartSiC partnership at Lubbock [S12].
New CEO Damien Macq strategic refresh expected during 2026.
H2 2026 auto recovery flagged by management [S5].

9. Headwinds & key risks

Melexis concentration in a soft auto cycle. ~45% of revenue from one customer in a segment now declining (auto −10% YoY Q1 2026, “limited short-term visibility” per management [S5]). A single LTA renegotiation just hit Q4 2025 with a US$9.3m one-off [S3]. If Melexis cuts wafer starts or renegotiates pricing again, X-FAB’s revenue and margin both reset down.
SiC scale disadvantage vs vertically-integrated IDMs. STM (32.6% share), onsemi (~25%) and Wolfspeed (~11%, post-bankruptcy clean balance sheet) own >70% of a US$2.7bn market [S17][S19]. X-FAB’s SiC is only US$33.8m FY25 and the Q4 +77% YoY headline came with a US$9.3m raw-wafer LTA write-down — pricing power is on the IDM side, and X-FAB has had to absorb substrate-cost pass-through losses. Wide-bandgap +152% YoY in Q1 2026 [S5] is real but off a low base, in a market structurally over-built post-Wolfspeed restart.
Capital intensity vs uncertain returns; no FY26 guidance. FY2025 capex US$204m on revenue US$870m = ~23% capex/sales [S6]; cumulative ~~US$1.2bn 2023–25 program. Negative free cash flow (~~−US$60m FY25) and net debt of ~US$273m [S6]. EBITDA margin compressed from 27.1% → 23.1% → 22.6% → 17.5% Q1 2026 [S1][S2][S3][S5]. Capex sized for a SiC/180nm BCD ramp that hasn’t fully arrived; absence of FY26 guidance plus retail-driven share-price spike create a re-rating risk on any miss.
Retail-driven price spike priced for perfection. Consensus analyst PT €5.29 vs €13.18 spot [S13]; the YTD +141% rally came largely on a viral X post (May 27, 2026) with no fundamental catalyst. Reversion risk is material.

10. Valuation

Metric	Value	Source
Share price (close 27 May 2026)	€13.18 (intraday high €15.88)	[S13][S14]
Shares outstanding	~130.6m	[S28]
Market cap	~€1.72bn (touched ~€2.06bn intraday)	[S14]
Net debt	~US$273m (cash US$194m, debt US$467m)	[S6]
EV (post-spike)	~€1.97bn (~US$2.2bn)	derived
EV/Sales FY25	~2.5x post-spike (~1.0–1.2x pre-spike [S20])	derived
EV/EBITDA FY25	~11x post-spike (~3.7–5.2x pre-spike [S20])	derived
Analyst consensus 12-mo target	€5.29 (Investing.com) → ~60% below current	[S13]
Free float	38.2–42.1%	[S28]

Pre-spike X-FAB at ~1x sales was deeply discounted vs all listed foundry peers. Post-spike at ~2.5x sales it has converged to the cheap end of the foundry peer range (UMC ~2.4x, GFS mid-single), still well below Tower’s distorted 17x. But the move is retail-driven, not earnings-driven, and consensus targets sit far below.

11. Verdict & what to watch

X-FAB is a genuinely profitable European specialty foundry levered to real secular growth (SiC, MEMS, medical) — but the FY2025 results show margin compression, FCF turning negative, and a missing FY2026 guide. The 27-May retail spike has priced the stock at ~60% above consensus analyst PT without any change in fundamentals. Melexis at ~45% of revenue in a soft auto cycle is the unpriced concentration risk.

Verdict: profitable specialty foundry, but margin-compressing and retail-priced at ~60% above analyst PT — confidence 0.45.

Decision boundaries:

FY2026 guidance issued with EBITDA margin ≥20% → more positive (+).
Sustained SiC ramp without further LTA write-downs (Q2/Q3 2026) → more positive (+).
Customer diversification — Melexis share dropping below 35% → more positive (+).
Q2 2026 EBITDA margin slipping below 17% → very negative (−).
Melexis pricing renegotiation or volume cut → very negative (−).
Retail spike reverses 40%+ as flow unwinds → expected baseline outcome.

Open questions:

Updated FY26 guidance from new CEO.
Detailed SiC pricing post-LTA renegotiation.
Specific Melexis order trajectory through 2026.
Sarawak utilisation rate at full ramp.

Customers & suppliers

Customers (top names, mostly inferred from industry compilations): Melexis (~45%), Goodix, Lite-On, Micronas (TDK), Sensata, IDT, Knowles Electronics, plus ~400 others [S25].

Suppliers: silicon and SiC substrates; specialty equipment and materials; Soitec SmartSiC at Lubbock [S12].

Sources

[S1] [T3] X-FAB Q4/FY2023 Results, Business Wire, 8-Feb-2024.
[S2] [T3] X-FAB Q4/FY2024 Results, Business Wire, 6-Feb-2025.
[S3] [T3] X-FAB Q4/FY2025 Results, Business Wire, 5-Feb-2026.
[S4] [T3] X-FAB FY2025 segment summary, AnySilicon.
[S5] [T3] X-FAB Q1 2026 Results, Business Wire / Compound Semiconductor, 29-Apr-2026.
[S6] [T3] X-FAB cash-flow & balance-sheet data, AlphaSpread / Investing.com (TTM and end-2025).
[S7] [T3] X-FAB Q3 2025 Results, Business Wire, 30-Oct-2025.
[S8] [T3] X-FAB MEMS / Microsystems FY25 >US$100m, Q4 2025 release coverage, Morningstar.
[S9] [T3] EE Times — Silicon Carbide Growth Pivots Around AI and Energy.
[S10] [T3] The Star (Malaysia), X-FAB Sarawak boost wafer output to 40,000, 12-Aug-2025.
[S11] [T3] MIDA — X-FAB’s RM3bn Sarawak expansion.
[S12] [T3] X-FAB & Soitec SmartSiC at Lubbock, GlobeNewswire, 22-May-2024.
[S13] [T3] Global Banking & Finance, X-FAB retail-driven rally, 27-May-2026.
[S14] [T3] TS2.tech — X-FAB Stock Shock: 76% Intraday Burst, 27/28-May-2026.
[S15] [T3] X-FAB CEO succession announcement, Business Wire, 30-Oct-2025.
[S16] [T3] Analog/Mixed-Signal Wafer Foundry market sizing — IntelMarketResearch / MarketGrowthReports; specialty foundry market, DataM Intelligence.
[S17] [T3] SiC market size & share, TrendForce / Semiconductor Today; Mordor SiC power.
[S18] [T3] MEMS foundry market, Business Research Insights; MEMS sensors, Mordor.
[S19] [T3] Wolfspeed Chapter 11 emergence, Sep 2025 — SEC 8-K.
[S20] [T3] X-FAB valuation multiples (pre-spike), GuruFocus & StockAnalysis.
[S21] [T3] Tower Semiconductor multiples, CompaniesMarketCap / Multiples.vc, May 2026.
[S22] [T3] GlobalFoundries FY2025 6-K filings.
[S23] [T3] UMC valuation, StockAnalysis / Multiples.vc.
[S24] [T3] Intel-Tower deal termination, CTech / Cognitive Market Research.
[S25] [T3] X-FAB customers & geography, Wikipedia + MoatMind deep-dive.
[S26] [T3] Melexis concentration discussion, Silba Deep Dives.
[S27] [T3] X-FAB H1 2024 Half-Year Report (Xtrion / Melexis disclosure).
[S28] [T3] X-FAB IPO release / shares-outstanding, Euronext IPO note.