Onsemi agrees to buy Synaptics in $7 billion all-stock deal

Onsemi agreed on June 25 to buy Synaptics in an all-stock deal valued at about $7 billion, a move that gives the Arizona chipmaker its biggest acquisition ever and plants it more squarely in the race to supply AI-enabled devices. Synaptics shareholders will receive 1.350 shares of onsemi common stock for each Synaptics share, a ratio that implies about a 19% premium based on the companies’ 10-day volume-weighted average closing prices.

The logic is less about scale for its own sake than about where semiconductor demand is shifting. Onsemi has built its business around intelligent power and sensing for automotive, industrial and AI data center markets, while Synaptics has spent years pushing connected computing, human-machine interfaces and edge AI products such as its Astra embedded compute line, Veros wireless portfolio and interface hardware. Together, the companies are aiming at what onsemi calls physical AI, systems that sense, decide, act and adapt inside vehicles, factory equipment, robotics and consumer hardware rather than only in cloud servers.

Onsemi said the combination would expand its total addressable market by $30 billion to $243 billion by 2030. Hassane El-Khoury, onsemi’s chief executive, framed Synaptics as a strategic fit because it adds connected-computing capabilities, software and ecosystem reach, and a human-machine-interface business that extends onsemi’s existing strengths in power and sensing. The target is especially relevant as manufacturers push for smarter sensors, more on-device processing and better interfaces in automotive, industrial and emerging robotics markets.

The deal also underlines how aggressively chipmakers are trying to move beyond older product cycles and into higher-growth AI categories. Onsemi said the transaction is its largest ever, surpassing its $2.4 billion purchase of Fairchild Semiconductor International in 2015. Synaptics, founded in 1986 by Carver Mead and Federico Faggin, brings a long history in interface technology that now maps neatly onto the industry's push toward edge computing and machine interaction.

Investors did not greet the announcement warmly. Onsemi shares fell sharply in the first trading session after the deal was announced, while Synaptics stock rose, a split that suggested enthusiasm for the strategic rationale but skepticism about execution and dilution. By the exchange ratio, Synaptics holders would own about 12% of the combined company once the transaction closes, adding to concerns about how much value accrues to onsemi shareholders.

The companies said they expect the transaction to close in mid-2027, pending regulatory and shareholder approval. If it does, onsemi will be building not just a bigger chip company, but one more tightly aimed at the market for intelligence embedded in physical machines.