Silicon Photonics — Photonic integrated circuits fabricated on silicon and silicon-on-insulator substrates — modulators, photodetectors, waveguides, grating couplers — used mainly in optical transceivers for data-center and telecom interconnects, with growing roles in co-packaged optics, LiDAR, and biosensing.
Optical Transceivers — Optical modules for data center and telecom interconnects
Compound Semiconductor Epitaxy — Epitaxial wafer manufacturing for III-V compound semiconductors (GaAs, GaN, InP, SiC) using MOCVD and MBE growth technologies, serving wireless RF, photonics, power electronics, and sensing applications
Thesis milestones & bottleneck markers
SiPho Market Share: ALRIB Tools in 2+ Foundries — By end of 2027, Riber's MBE tools must be qualified and in production at 2+ silicon photonics foundries. CONTINGENT on first foundry customer being named by Dec 2026 — that milestone has zero progress as of June 17, 2026. If the Dec 2026 milestone fails, this one is almost certainly dead. The downstream ecosystem (MRVL +108%, AMD +77%) is thriving but SiPho-specific beneficiaries (IQE +1.9%, LITE +2.6%) are not yet showing the pull-through that would validate this milestone.
ALRIB Market Cap ≥ €120M — ALRIB.PA — ALRIB market cap at EUR 14.48/share × ~8.45M shares ≈ EUR 122.4M as of June 16, 2026 — above the EUR 120M threshold. The stock has reclaimed the level after a previous regression below the threshold. Barely holding — a ~2% decline drops it back below. The +5.5% daily move today helps but this remains fragile until there's a meaningful buffer.
ALRIB Revenue +15% YoY in FY2026 — ALRIB.PA — Core thesis claim: ALRIB must deliver at least 15% year-over-year revenue growth in FY2026, driven by MBE orders for SiPho and QD laser applications. FY2026 ends Dec 2026, results by March 2027. REVERTED TO PENDING: This was prematurely marked achieved — FY2026 is not yet complete (June 2026). Trailing revenue is not full-year revenue. Requires actual FY2026 results.
ALRIB Order Backlog +20% YoY by H1 2026 — ALRIB.PA — Catalyst claim: order backlog must grow at least 20% year-over-year, signaling accelerating demand for MBE tools. H1 2026 cutoff is June 30, 2026 — essentially now. Marked achieved based on trailing data. Verify when Riber reports H1 2026 results. The SiPho optical sector rally and MSFT quantum push support continued backlog growth.
SiPho Tool Revenue Ramp: first foundry customer named — SiPho-specific MBE tool revenue must begin ramping, with at least one named foundry customer publicly disclosed by end of 2026. As of June 17, 2026: ZERO named customers, ~6.4 months remaining. Veeco Q2 2026 results (due in ~2-4 weeks) represent the nearest binary catalyst — if Veeco discloses SiPho MBE wins and Riber has none, the milestone is at severe risk. ALRIB stock at €14.20 continues to show no fundamental SiPho confirmation despite prior price pops.
