Synaptics (Nasdaq: SYNA) rose 14% and ON Semiconductor (Nasdaq: ON) gained 8% in US trading after the parties shifted their pending transaction to a $5.7 billion all-cash offer, replacing a $7 billion stock-based structure.

The repricing is significant because the headline value moved in the opposite direction from typical M&A renegotiations. Cash deals normally sit at a discount to stock offers because they remove the upside-skew of acquirer equity; here, the cash figure is lower in absolute terms but transfers more value per target share once the underlying math is unpacked.

Why does the move from stock to cash matter?

Equity consideration lets an acquirer share future upside with target holders. Cash consideration transfers that upside to the buyer's balance sheet. A $1.3 billion reduction in headline value — from $7B in ON Semi paper to $5.7B in cash — does not necessarily mean Synaptics holders receive less. The stock figure embeds ON Semi's share price at announcement; a cash bid is fixed against Synaptics' standalone equity plus a control premium.

In practical terms, the switch removes a layer of integration risk. Shareholders of the target no longer have to underwrite the buyer's stock to confirm their consideration. They take the cash and exit.

How did the market read the two stocks?

Synaptics' 14% jump on the news suggests investors view the cash offer as a higher-probability close than the prior stock structure. ON Semi's 8% gain — smaller in percentage terms but on a much larger market capitalization — indicates the market is not penalizing the acquirer. A financing scare or rating-agency concern would normally drag ON Semi's shares down, not up.

The two-sided move is the cleanest possible signal of strategic alignment. Bid-ask spreads on a live transaction are the market's real-time referendum, and here both sides cleared in the same direction.

What does each company bring?

ON Semiconductor designs power discretes, analog ICs, and intelligent power modules for automotive, industrial, and cloud-power customers. Its product line spans IGBTs, MOSFETs, SiC devices, and image sensors across the 150mm and 200mm wafer sizes that anchor the company's Phoenix and European footprint.

Synaptics designs mixed-signal SoCs for human-interface applications — touch controllers, display drivers, audio DSP, and biometrics — plus AI-enabled edge inference and automotive HMI silicon. Its revenue mix tilts toward consumer IoT, PC peripherals, and automotive cockpits.

A combination would extend the acquirer's silicon content per vehicle in the cockpit segment while pulling its sensing and compute footprint further from the power-electronics core.

What remains undisclosed?

The source headline does not specify the per-share offer price, the closing date, the regulatory path, or the financing structure. It also does not clarify whether the $5.7 billion refers to enterprise value or equity value, or whether the prior $7 billion stock figure included any assumed debt or hedging.

Until ON Semi and Synaptics file a joint press release, an 8-K with the SEC, or a definitive proxy, those data points remain unfilled. They are the inputs that will determine the all-in IRR for ON Semi's shareholders and the per-share value for Synaptics holders who do not tender.

What to watch next?

Cash deals typically clear faster than stock deals because they remove the acquirer-shareholder vote as a closing condition. If the parties file an HSR notification within 30 days, a US-only transaction could close inside 2025. Any EU or China reference would extend that timeline and bring antitrust scrutiny to the combined automotive silicon footprint.

The next two earnings cycles will test whether the cash structure has shifted ON Semi's net-debt position enough to matter for its capital-return policy — buybacks, dividends, and continued capex on SiC and BCD power capacity through 2027.