Coherent Inc (COHR) — Quality & forensics

Long reads

• Optical Interconnects — The Toll Nobody KeepsReport · 13 Aug 2026On Friday, Coherent fell 11.8% through its 50-day average on no numbers at all.
• Portfolio Construction — Build a Barbell · Closelooknet Heresy IIIHeresy · 16 May 2026Live cohort as of May 2026: COHR · CRWV · GLW · INTC · IREN · LITE · MRVL · NBIS · NOK · SNPS.
• Pattern 03 — NVIDIA Strategic Authority InvestmentReport · 12 May 2026Tier 2 typically appears bundled inside Tier 1 events: Lumentum's capacity-access rights, Coherent's purchase commitments, and IREN's 5 GW deployment partnership all rode in on the same 8-Ks as the equity investments.
• Nvidia’s Equity Stakes — Follow the Wise Men, Pattern 03 PreviewWeekly Signal · 10 May 2026Coherent has moved from $50 in April 2025 to $335.26 today.

101 and glossary

• Networking & Optical Interconnects: The Constraint After Compute101NVIDIA’s networking stack (acquired via Mellanox), Broadcom’s switching silicon, Marvell’s interconnect IP, and the optical transceiver ecosystem (Lumentum, Coherent, Fabrinet) all benefit from the same physical reality: at cluster scale…
• Optical TransceiverGlossaryA device converting electrical signals to optical for fiber networking; LITE, COHR, and FN are pure-play beneficiaries.
• Strategic Authority Investment: Reading the Jensen Huang Roadmap101Forward watchlist: LITE, COHR, FN (optical), MU (memory), VRT, GEV (power), PSTG, NTAP, WDC (storage).

Dailies

• Korea — Kospi −5.5% breaks its 18-month uptrend; SK Hynix and Samsung about −8% on a China memory scareMorning 10 · 13 Oct 2026The optical-network suppliers fell harder: Lumentum −9.8% to 995.41, Coherent −7.9% to 288.02.
• Chips — memory and optics sold again: Lumentum −7.7%, SanDisk −6.5%, chip fund −2.6%; Meta +3.8%Midday 10 · 12 Oct 2026Memory and optics sold: Ciena −7.8%, Lumentum −7.7% to $1,018, SanDisk −6.5% to $1,479, Coherent −5.6%, Corning −5.0%, Micron −4.0% to $988
• Jobs day — futures +0.3% before payrolls; Nike −8.7% after hours, Accenture holds +15.8%Morning 10 · 2 Oct 2026Accenture closed up 15.8%, Synopsys 12.8%, Fair Isaac 11.7%, Coherent 10.9% — the companies the market had filed under AI losers are the ones it bought.
• Jobs-day rally fades — weak payrolls lift stocks at the open, then yields turn up and the Dow goes flatMidday 10 · 2 Oct 2026Chips lead: chip funds SOXX +2.4% and SMH +2.00%, AMD +2.83%, Broadcom +2.32%, Nvidia +1.52%; optics Coherent +4.02%, Lumentum +3.16%; Oracle +2.38%; software fund IGV flat (+0.14%)
• AI comeback — Accenture +18%, Synopsys +8%, optics +9% while all three US indices slipMidday 10 · 1 Oct 2026AI hardware suppliers jump: Coherent $316.10 (+9.83%), Lumentum $1,057.23 (+8.85%); Arista +0.35%, Nvidia +0.35%, Broadcom −1.24%; in Tokyo, Lasertec +11.14% and Advantest +9.78%
• Expiry Friday — the equipment names join at last: Applied +4.4%, Lam +5.2%, memory ETF over $58, 10-year back at 5%Midday 10 · 18 Sept 2026At midday on the September expiry they are joining: Applied Materials +4.4%, Lam Research +5.2%, KLA +2.7%, the three largest gainers in the group after four sessions of lagging the designs, with Coherent +4.9% and Broadcom +2.3%…
• Day after the hike — yields fall and the lines are retaken: 10-year 4.95%, chips +3% over $505, S&P ETF above $757.83Midday 10 · 17 Sept 2026Chips, the design side wider: AMD +6.4% to $545.38, Micron +5.5% to $977.94, Broadcom +2.9% to $349.39, Nvidia +2.3% to $218.74, TSMC +2.1% to $425.93; memory ETF +4.4% to $57.63; optics pause — Lumentum −0.4% at $916, Coherent +1.2%
• Rates — the Fed hikes and the 10-year closes above 5%: the belly sold, the relief unwound, chips back under $505Morning 10 · 17 Sept 2026Inside chips the day was not one story: optics and interconnect were bought hard — Lumentum +9.6%, Credo +7.4%, Coherent +6.9%, Astera Labs +6.6%, Soitec +13.4% in Paris — and the equipment names were sold again, Applied Materials −1.4%…