Harmonic is the clearest pure-play winner of a multi-year cable broadband upgrade cycle driven by agentic AI and home compute pulling more bandwidth. Its cOS runs the networks of almost every major cable operator with about 95% share, and replacing it needs 18–24 months of certification, so it owns the market into 2028. Business outside its two largest customers grew 78% and is now most of bookings. Growing 43%, it trades in the low 20s on FY2027 earnings. x.com 

Harmonic's cOS turns it into a software business whose margins rise with every cable operator that converts from hardware. cOS virtualizes cable access networks, holds over 95% share of virtualized CCAP and serves every major US cable operator; DOCSIS 4.0 upgrades by Charter, Comcast and Cox against fiber require it. Q1 revenue rose 43% to $121.7M, backlog rose 87% to $582M of mostly software and services, and gross margin is 52%. At 3.5x forward revenue versus peers' 4-6x, it hasn't re-rated. … Show more

Harmonic is still incredibly early in a global adoption wave: a first smaller European operator has started deploying its solutions, and the giants will have to follow given technical realities. Its cOS virtualized platform dominates the cable core, delivering multi-gigabit DOCSIS 4.0 over existing coax; per @KawzInvests, Comcast, Charter, Cox and Altice run it, with 150 customers and 45.7 million modems. Virtual OLT software opens a $2.5 billion-plus fiber market. x.com  x.com 

Harmonic's fundamentals kept improving while the market forgot it. It delivered a double beat and raised guidance, and the stock showed strong price action with a clean retest of its 50-week average. x.com 

Harmonic is a high-risk, high-reward bet on the multi-year DOCSIS 4.0 cable upgrade cycle as it sells its video segment for $145M to become a pure-play broadband company. Q1 2026 broadband revenue rose 43%, backlog hit a record $574M, up 87%, and full-year guidance was raised to $475-495M. It remains GAAP unprofitable, depends heavily on Comcast, has flagged supply chain issues and is early in its shift to recurring revenue. x.com 

Harmonic is the toll booth between AI-era traffic and US cable networks, with over 95% of the software operators need for DOCSIS 4.0 upgrades. Upstream traffic grows 21.7% a year, so operators must upgrade or lose subscribers to fiber. Comcast, Charter, Cox and Altice run its cOS platform, and every node in Charter's $5.5B upgrade needs a Harmonic license. Q1 revenue rose 43% and backlog hit $582M, up 87%, while software should rise from 8% of revenue in 2022 to 38% by 2028. x.com  x.com  x.com 

Sivers is less exposed to tighter AI financing because its 700M SEK raise funds a buildout largely reliant on external foundries. It is qualifying with Ayar, Jabil, GlobalFoundries and O-Net for potential tier-one hyperscaler pluggable, CPO and NPO deployments. Higher rates may strain neoclouds needing billions for GPUs, but optical content and aggregate demand should still rise even if hyperscaler AI capex falls, especially as new players start qualification. x.com 

Corning is a structural loser from orbital AI data centers, because compute migrating from fiber-intensive terrestrial data centers to zero-fiber orbital ones reduces fiber demand. In vacuum, satellites link by free-space lasers rather than fiber, so Corning's hyperscale data center fiber business faces a long-term headwind. It is not a short, since 5G and fiber-to-the-home provide other drivers, but the exponential AI-fiber narrative weakens materially. x.com 

Harmonic is turning into a pure-play AI-broadband infrastructure compounder the market still prices as the old company. Selling its video business to MediaKind for $145M leaves pure broadband, with cash for DOCSIS 4.0, fiber and buybacks. Q1 broadband revenue rose 43%, backlog 87% to $582.1M, and FY26 broadband guidance was raised to $475-495M. Its cOS platform first unified FDX and FDD DOCSIS 4.0, so operators needn't switch suppliers, and 33M+ devices create sticky switching costs. x.com  x.com  … Show more

Corning now has long-term fiber deals with both Verizon and AT&T, supplying both broadband expansion and links between AI data centers. AT&T announced a multiyear fiber and cable deal exceeding $3B focused on home and business broadband, following Verizon's multibillion-dollar deal for over 80 million fiber miles from 2027 to 2032, including long-haul AI data center links. These deals could improve demand visibility; watch shipment ramps and profit growth versus expansion costs. x.com