2026-08-24 — IBM builds native Arm support into its next mainframe chip; Arm shares jump on the tie-up plus a reported $2B AI-chip backlog

• IBM unveiled its next-generation dual-architecture mainframe processor — the first chip to run IBM Z and Arm-native workloads on the same cores — under a strategic collaboration first announced 2026-04-02 and now shipping as real silicon, aimed at running Arm-native AI applications on Z mainframes and LinuxONE servers. Confirmed via both companies’ own newsrooms and corroborated by VentureBeat, Forbes, and SiliconANGLE. This is a genuinely new kind of design win for Arm’s royalty base — enterprise mainframes, not the mobile/cloud/AI-accelerator markets the thread has tracked so far. (IBM Newsroom, Arm Newsroom, VentureBeat)
• Arm shares jumped after hours on the IBM news plus a separately reported $2B AI-chip order backlog it “cannot fill yet” — the first concrete evidence since the thread opened that Arm’s non-royalty chip ambitions (the in-house “AGI CPU”) are converting into an actual order book, not just an announced pivot. Stock context: Arm had been down as much as 46% from its June peak before this. (finance.biggo.com, TradingKey)

2026-07-31 — A one-day snapback: Arm +9% on the broad Tokyo chip rally

• Arm rose 9% overnight as part of a broad Tokyo AI/semiconductor rally (Nikkei 225 +4.37%) triggered by strong US tech earnings — reversing, at least for one session, the guidance-cut selloff that closed out 07-29’s beat-and-raise coverage. See Son All-In for the fuller Tokyo-session read (SoftBank itself hit limit-up the same day, still ahead of its own 08-06 earnings). (Bloomberg Japan)

2026-07-29 — A clean beat-and-raise, and the stock fell anyway

• Q1 FY2027: revenue $1.289B (+22%), royalty $715M (a Q1 record), licensing $574M (a Q1 record), non-GAAP EPS $0.45 — all above consensus, with Q2 guidance ($1.38B / $0.47) also above estimates. (Arm Newsroom)
• AGI-CPU demand now exceeds $2B across FY27-FY28, double the initial forecast, with capacity already sold out and data-center royalty revenue more than doubling year-over-year — the AI-specific story genuinely strengthened. (Arm Newsroom)
• What actually moved the stock: full-year royalty growth guidance was cut to “high teens” from roughly 20%, on expected double-digit smartphone-market weakness. The stock fell further after-hours (-7 to -8%) and stayed down premarket (-4.95%), extending the pre-earnings -28% run rather than reversing it. (MarketScreener)
• This is the sharpest rotation-away-from-chips signal of the four prints tonight — a genuinely good AI-specific number was not enough to buy relief once a legacy-business guidance cut sat next to it.

← Backstory (crawl 2026-07-28 → artifacts/findings/arm-royalty-regime-2026-07-28.md)

• Qualcomm wins the trial, Arm appeals — a Delaware judge rejected Arm’s last remaining claim in the Qualcomm licensing dispute (the architecture-license question the Dec-2024 jury deadlocked on), handing Qualcomm a full trial-court win; Arm said it would appeal. 2026 appeal status not found. (The Register)
• Royalty growth stayed real — four straight >$1B quarters through FY2026 (Jul-25 → May-26), Armv9 + CSS cited as the driver, royalty revenue +25% YoY in Q1 FY26; exact FY2026 full-year digits ($4.92B rev / $2.61B royalty) not independently re-verified this session — IR pages returned 404. No v10 architecture found. (Arm Newsroom)
• SoftBank leans on Arm shares as collateral, not a sell-down — sought a $5B loan against Arm shares (Oct-25) and a separate $20B Arm-collateral margin loan facing a Dec-2025 deadline (outcome unresolved), while also renewing (Jul-26) a $10B loan against its OpenAI stake — the same crown-jewel-leverage playbook, two different collateral pools. (Reuters)
• Raspberry Pi flag likely resolved, not confirmed — an Arm subsidiary invested £50M into a £60M Raspberry Pi share placing (Apr-23-26), a follow-on top-up of a stake held since 2023 — timing fits the FY26 20-F’s unresolved subsequent-event flag but this crawl could not directly confirm the link. (businesscloud.co.uk)
• Arm shipped its first-ever in-house chip — the “Arm AGI CPU” (136-core, Neoverse-based, AI-inference-targeted) launched 2026-03-24, Arm’s first self-designed chip in 35 years; Meta is the launch customer, with OpenAI/Cerebras/Cloudflare also named. Arm now competes with some of its own licensees. (TechCrunch)
• Datacenter share grew fast, size disputed — server-CPU revenue share roughly doubled 15%→25% YoY by Sep-25 (short of Arm’s own 50%-by-end-2025 target); by mid-2026 competing figures (a non-Arm- specific 47.9% “non-x86” IDC number, and an unnamed Arm exec’s >50% hyperclaim to Nikkei) don’t reconcile to one clean number. Meta signed for both AWS Graviton5 and standalone Nvidia Grace CPUs. (The Register)
• RISC-V went from theory to funded threat — Qualcomm acquired RISC-V design firm Ventana Micro Systems (Dec-25), explicitly framed as hedging Arm dependence amid the litigation, and by mid-2026 was reportedly in talks to acquire RISC-V AI-chip startup Tenstorrent for $8-10B; China (Alibaba’s XuanTie C950, SpacemiT) pushed its own RISC-V self-sufficiency line in parallel. (Qualcomm)
• Stock turned volatile into July — ARM fell 17.4% (Jul-18, tied to AI-chip pullback + China export concerns) and was down 28% over the month heading into 2026-07-29 Q1 FY2027 earnings — the next real test of whether the royalty + AGI-CPU story shows up in guidance. (24/7 Wall St.)