Synaptics Stopped Being Its Own Chart the Day onsemi Agreed to Buy It—$97 Decides Whether Today's Reclaim Holds

Synaptics (SYNA) is up more than 8% to about $101 this afternoon, reclaiming its 200-day moving average on a day when its price found its high and stayed there. A classic reclaim, a breakout off the open low, an eager tape. That is the headline. It is also largely beside the point, because the chart everyone is reading is not the chart that matters.

Here is what actually moved: onsemi (ON) is up 8.5% to about $76 on the same session. Multiply that by 1.35 and you get $102.8. That number, not any support line drawn from Synaptics' own tape, is the price Synaptics is anchored to. How fast you can trust the reclaim, and how much room it has, is now a question about onsemi's chart and about a deal that doesn't close until mid-2027.

The day Synaptics became a derivative of onsemi

On June 25, onsemi agreed to buy Synaptics in an all-stock deal worth about $7 billion, exchanging . From that date forward, Synaptics' price stopped being a meaningfully independent series. Every $1 move in onsemi is now a $1.35 move in Synaptics by construction.

You can see it in the tape's own fingerprint. Synaptics' 52-week high of $149.11 was set essentially at the announcement, when onsemi traded near $110—and 1.35 × $110 is just under $149. Since then onsemi has fallen roughly 31% to today's $76, and Synaptics has followed it down a matching 32%, from about $149 to $101. The classical story—"Synaptics broke its June high and is now in support"—is really the story of onsemi's drawdown, wearing a different ticker.

That reframing is the thing most reads miss. People draw moving averages and trendlines on SYNA as though it were a company whose own buyers and sellers set the price. It isn't. Post-deal, SYNA's "support," "resistance," and moving averages are all downstream proxies for what onsemi does, times a fixed ratio. The only piece of price behavior unique to Synaptics is the gap between its stock and that conversion value.

The number that actually acts like support

That gap is roughly 1.7% right now: SYNA at $101.03 versus the 1.35 × ON anchor of about $102.80. This is the modern, deal-flavored equivalent of an anchored price level—call it the conversion line. It has real mechanics behind it, the way a round number drawn from today's quote does not.

As the merger grinds toward its mid-2027 close, subject to Synaptics stockholder approval and regulatory clearances, that discount is supposed to compress toward zero. Think of it as the market's running price on the two real risks in this story: that approval fails, or that you're tying up money for nine months while onsemi does whatever it does. The spread is pure closing-risk arithmetic. If the deal advances, SYNA can march upward toward its 1.35 × ON anchor even while onsemi sits still; if deal risk suddenly looks real, the spread blows out and SYNA underperforms its own acquirer.

The line that changes the odds

With that framework, today's action reads clearly. Synaptics gapped up, tagged a low at $94.16, and has spent the session climbing back above its 200-day at roughly $96.90 to the day's high of $101.06, with volume running near a normal full-day pace. The reclaim of the 200-day is real. But whether it has room depends on the 1.35 × ON ladder above it.

The next contested shelf is the 50-day moving average near $107.50—which is 1.35 × onsemi at about $79.7, the round area ON is pressing toward after today's 8.5% surge. That is the confirmation zone: hold the reclaimed 200-day and reach the 50-day, and the bounce has follow-through, because the deal math keeps lifting SYNA mechanically with each ON point. Lose the 200-day—a close back under the $95 area that contains today's low—and the reclaim fails, and the next honest support on this ladder sits well below.

Scenario	Trigger	Path	Invalidation	Horizon
Reclaim extends	SYNA holds above 200-day (~$97)	Grind toward 50-day (~$107.5) as ON keeps its bid	Close back under ~$95	Days–weeks
Deal-risk reprice	Spread widens from ~1.7% toward 3%+	SYNA lags ON or drifts to its anchor downside	Approval/regulatory negative	Sessions
Worst case	onsemi's bid breaks or deal terminates	SYNA resets to a standalone multiple, far below	Termination event	Deal-linked

The honest asymmetry is what anyone tying money to this should hold: the upside path runs through onsemi extending its rally, and through the ~1.7% spread grinding flat by closing. The downside that breaks everything is not a chart level at all—it is the deal itself. Below $95 SYNA has left its reclaim; a widening spread is the first warning the market is re-pricing whether that deal ever happens. Hold the 200-day and the mirror stays intact; lose it, and the only number that matters stops being $97 and becomes the odds of a closing. As of 1:50 p.m. ET, Synaptics is on the right side of that line.