Three semiconductor companies get grouped together as the machinery of "edge inference" — the silicon that runs artificial-intelligence models inside a security camera, a car or a doorbell instead of in a data center, and gets paid per shipped device rather than per rack. Over the past twelve months the three moved apart violently, and the reasons had almost nothing to do with per-device AI content.

The bid, not the business

Ambarella designs low-power system-on-chip processors that fuse video compression, image processing and computer vision, sold to camera makers, automotive driver-assistance suppliers and robotics firms. On 31 July its shares jumped 16.1%, from $74.09 to $86.00, on 9.2m shares against typical daily volume of 1-2m. The cause was a Financial Times report that NXP Semiconductors was in talks to acquire it for more than $3bn — no agreement reached, no comment from either side. NXP's own shares fell more than 6% on the report, erasing roughly $4bn of value. Remove that one session and the rest of the month nets to about -2%, leaving Ambarella below where it traded a year ago.

The business underneath is real but slowing. Revenue growth has decelerated for four consecutive quarters — 49.9%, then 31.2%, 20.1% and 16.9% in the April quarter, on revenue of $100.4m. Gross margin was 59.1%. Inventory days rose to 145 from 99 on a deliberate pre-build ahead of memory price increases; that caution looks well judged, with TrendForce now modelling a 105-110% quarter-on-quarter surge in PC DRAM contract prices. Edge-AI chips were 80% of last fiscal year's $390.7m of revenue, and a ten-year agreement with South Korea's Hanwha Group is worth more than $800m.

What it is not is cheap. Ambarella trades at 94.4x forward earnings and 12.7x forward gross profit against consensus revenue growth of 13.2%. Its trailing price-to-gross-profit is 13.9x, against 13.7x a year ago — no re-rating at all, just price and gross profit advancing together from an already extreme level. Its scarcity value is genuine: Mobileye is majority-owned by Intel, Hailo is private, and the fast-scaling rivals — Horizon Robotics, Black Sesame — are Chinese and largely closed to Western OEMs. In driver-assistance silicon, though, it is a challenger to Mobileye, NVIDIA and Qualcomm, not an incumbent, and research and development absorbs 50-70% of revenue. One distributor, WT Microelectronics, was about 61% of last quarter's sales.

The royalty that didn't arrive

CEVA licenses digital signal processor cores and Bluetooth, Wi-Fi and cellular connectivity designs to chipmakers, collecting royalties on shipped devices. It ships no silicon itself. Second-quarter revenue rose 13.1% to $29.0m — a fourth straight quarterly acceleration — at an 87.4% gross margin, and management raised full-year growth guidance to 13-15% from 12%. The shares fell 13.4% that day and a further 10.8% on 18 August.

The split explains it. Licensing revenue rose 21% to $18.2m, a three-year high and 63% of the total, while royalties — the per-device stream the whole edge-inference case rests on — were flat at $10.8m. Customers shipped 567m units, up 16%, but Bluetooth shipments fell 16% to 295m. A new deal placing its NeuPro-M neural accelerator inside a major computing platform's custom silicon carries a 1.5-2 year path to production, meaning no royalties before roughly 2028. At 8.2x trailing gross profit, CEVA has given back part of a re-rating — it stood near 10.4x in mid-May — but remains about 40% above the 5.9x of a year ago.

The one that isn't an edge story

Lattice Semiconductor sells low-power field-programmable gate arrays into communications, computing, industrial and automotive equipment, and is up 91% over twelve months. Its record quarter — revenue of $201.1m, up 62%, at a 70.3% gross margin — came from Compute & Communications, up 83% on AI data-center capital spending and rising FPGA attach per server. Industrial and embedded, the actual edge segment, grew 36%. Management expects AI-related revenue to reach a quarter of this year's total and says 2027 is "pretty much booked." The 12.5% drop on 28 July was deal risk: the $1.65bn AMI acquisition closed on $1bn of cash and a $950m delayed-draw term loan. AMI is boot firmware and server manageability software — data-center plumbing, not edge silicon. Lattice's trailing price-to-gross-profit has expanded to 36.6x from 26.0x a year ago.

Two controls settle it. indie Semiconductor, the purest automotive edge-AI name, grew revenue 24% to $64.0m and is down 6.0% over the year, with gross margin compressed to 36.1% from 40.6%. Synaptics, which sells touch, display and ultra-low-power wireless edge chips, rose 47.9% and trades at 19.2x forward earnings — a quarter of Ambarella's multiple on comparable positioning. Exposure to per-device AI content was not what got paid; data-center attach was.

The past week's decline is shared and macro. The 30-year Treasury yield topped 5.33% on 18 August, a 19-year high, and the Philadelphia Semiconductor Index fell 4.98%. On 20 August Lattice fell 5.3%, indie 7.7% and Synaptics 3.7% with no company news between them.

The setup

Where it stands — Ambarella's twelve-month advance rests on one takeover session; CEVA's growth is licensing, not royalties; Lattice's is servers, not the edge.

Would confirm — CEVA royalty revenue breaking above $12m a quarter, or Ambarella guiding October-quarter revenue above $120m.

Would invalidate — A signed NXP-Ambarella agreement, which would make the July session a floor rather than a rumor premium.

Watch next — Ambarella reports fiscal second-quarter results on 3 September 2026.

Valuation — Ambarella: 13.9x trailing gross profit and 12.7x forward, against 13.7x a year ago and Synaptics' 6.8x forward.