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Onsemi’s $7 Billion All‑Stock Deal for Synaptics Prompts Sharp Share Plunge

The deal immediately dilutes existing holders and raises execution and regulatory questions as the company promises $200 million in annual savings and a mid‑2027 close.

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Onsemi's $7 billion Synaptics deal, its biggest ever, sent the chipmaker's shares down about 21% in a single day, the worst since 2020.
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Overview

  • Onsemi announced it would buy Synaptics for about $7 billion in an all‑stock transaction on Thursday, June 25, with Synaptics shareholders to receive 1.350 Onsemi shares each.
  • Investors reacted with a severe sell‑off the next trading day as Onsemi shares fell roughly 21% on Friday, June 26, while Synaptics shares rose.
  • The stock payment will leave Synaptics investors owning about 12% of the combined company and causes immediate dilution of Onsemi holders that the market flagged as a key risk.
  • Onsemi projects roughly $200 million in annual cost savings and says the deal will be accretive to earnings about 18 months after a target close in mid‑2027, but analysts warn meaningful payoff may not show up until 2028–2029.
  • Analysts and investors flagged execution and regulatory risk, with TD Cowen downgrading the stock, while company leaders argue the deal expands Onsemi into edge or 'physical AI' by adding Synaptics’ edge AI, wireless and HMI technology.