ON Semiconductor Agrees to Buy Synaptics for $7 Billion in All-Stock Deal, Shares Fall After Hours

ON Semiconductor announced Thursday it has agreed to acquire Synaptics in an all-stock deal valued at approximately $7 billion, according to Reuters and confirmed across multiple sources. This is the Arizona-based chipmaker's largest acquisition to date.

Under the terms, each Synaptics shareholder will receive 1.350 shares of ON Semiconductor common stock per share held. Based on ON's closing price Thursday, that values each Synaptics share at roughly $160.30, a significant premium over Synaptics' closing price of $125.62, according to Stocktwits. The exchange ratio represents a 19% premium over the 10-day volume-weighted average closing prices of both companies' stocks.

Upon closing, former Synaptics shareholders will own approximately 12% of the combined company on a fully diluted basis, according to Crypto Briefing.

The Strategic Pitch

ON Semiconductor CEO Hassane El-Khoury told Reuters the deal is about accelerating the company's position in "physical AI," a term referring to AI embedded in physical devices and machines. Think automotive systems, industrial equipment, robotics, and AR/VR hardware.

"What Synaptics brings to us is this acceleration with a world-class connected compute platform that is already in the markets [that we play in]," El-Khoury said in the Reuters interview.

Synaptics brings Edge AI processing, human-machine interface solutions, and wireless connectivity to the table. ON Semiconductor's existing strengths are in power semiconductors and sensing technologies, particularly for the automotive and EV sectors. El-Khoury said the combination will create "a market leader in what is to be known as the physical AI realm."

ON projects the deal will expand its total addressable market by $30 billion, pushing the figure to $243 billion by 2030, according to CNBC. The company also projects $200 million in annual synergies and expects the acquisition to become accretive to non-GAAP earnings per share within 18 months of closing, according to Crypto Briefing.

Synaptics reported Q1 fiscal 2026 revenue of $292.5 million, a 14% year-over-year increase, per Crypto Briefing.

Market Reaction

Wall Street was not immediately enthusiastic about ON's side of the ledger. ON shares fell between 9% and 10% in after-hours trading Thursday, depending on the source. Synaptics shares, which had closed the regular session down 3%, surged roughly 12% after hours, according to Stocktwits and Reuters.

The divergence follows the classic acquirer-discount pattern. All-stock deals dilute the acquirer's existing shareholders immediately. ON is also authorizing a $6 billion share repurchase program concurrent with this announcement, per Crypto Briefing. This could partially offset dilution, though repurchases take time and depend on cash generation.

The Legitimate Concern

Skeptics of this deal have a real argument. ON Semiconductor has faced headwinds in its core automotive and industrial markets over the past two years, with customers working down elevated silicon carbide inventory. Paying a rich all-stock premium to acquire a company in a new AI-adjacent market, while your own stock is under pressure, is a meaningful risk. If the $200 million in promised synergies are delayed or don't fully materialize, the dilution from issuing all those new shares hits existing ON shareholders with no offsetting EPS benefit. The 18-month accretion clock does not start until the deal closes, which is not expected until mid-2027 at the earliest. That is a long runway of uncertainty.

ON's management would counter that the company is not buying a speculative startup. Synaptics has posted double-digit revenue growth, has an established customer base in markets ON already serves, and brings a connected compute platform that can be sold alongside ON's existing power and sensing products. The cross-sell opportunity, not just cost synergies, is the real thesis.

Context in the Broader AI Acquisition Wave

ON is not alone in deal-making mode. According to CNBC, Qualcomm this week acquired infrastructure startup Modular to strengthen its software stack. Earlier this month, Salesforce said it will buy AI customer service platform Fin for roughly $3.6 billion. Semiconductor and tech companies are spending heavily to avoid being left behind as AI hardware and software requirements consolidate.

What Comes Next

The deal requires approval from Synaptics shareholders and standard regulatory clearances before it can close, with the target window set for mid-2027, according to Reuters and Crypto Briefing. ON will also add one Synaptics board member to its board as part of the agreement, per CNBC.

The unresolved question is whether ON's automotive and industrial revenue stabilizes before the deal closes. If ON's core business remains soft through 2026 and into 2027, the combined company inherits integration costs on top of an already pressured balance sheet. The $200 million synergy figure and the 18-month EPS accretion promise are the two numbers analysts will be tracking against actual results once the deal shuts.