Onsemi has agreed to acquire Synaptics in an all-stock transaction at a fixed exchange ratio of 1.35 ON shares per SYNA share. At current prices, this implies a specific per-share value for SYNA holders, making the deal spread the immediate focus for arbitrageurs. No cash consideration means holders take full ON equity risk through close.

Synaptics brought in $1.1B in revenue for FY2025, up 12% YoY, with a solid 44.7% gross margin — but still unprofitable at the net level with a -$1.22 diluted EPS. Onsemi's own picture is more troubled: revenue fell 15.3% YoY to $6.0B and net margins are thin at just 2.1%, reflecting the cyclical downturn in its core automotive and industrial power semiconductor markets.

For SYNA holders, the deal is an all-stock swap into a company with meaningful revenue pressure, so the attractiveness hinges on where ON trades before close. For ON holders, they're absorbing a loss-making company's equity at a moment when their own cycle hasn't recovered. The strategic rationale — likely adding SYNA's edge AI and connectivity IP to ON's power/sensing platform — will need to be compelling to justify the dilution.

The key variables to watch: deal spread compression (or widening if ON sells off on the announcement), any regulatory review timeline, and whether ON's guidance at next earnings signals a cycle inflection. A rising ON share price benefits SYNA holders and validates the deal; a declining ON share deteriorates the merger consideration in real dollar terms with no floor.