A Form 4 for a Stock That's Already Sold

On Thursday, Synaptics, the chip company whose touch controllers and fingerprint sensors end up inside a lot of consumer devices, filed an amended insider-trading form, and the entire content of the amendment was that nothing had happened. The filing, for an executive named Esther Song, restated her position at 21,591 shares, removed 776 unearned performance stock units from the old count, and recorded no purchases and no sales. It exists to correct the amount of securities beneficially owned that appeared in a Form 4 filed a year earlier. An "insider trading activity" filing whose only news is that there was no insider trading.

That was weird. You amend an insider form when a number was wrong, and here the wrong number was itself made up of shares that were never really hers to report. But there is a context that makes this fuss make sense, and it's the same context that makes the whole company's stock strange right now: the shares have, in a practical sense, already been sold.

On June 25, onsemi, the big power-and-sensing chip maker, agreed to buy Synaptics in an all-stock deal valued at about $7 billion, representing roughly a 19% premium over where Synaptics had recently traded, and it was the largest acquisition in onsemi's history. But here is the thing about an all-stock deal: it has no single price. It has an exchange rate. Every Synaptics share becomes 1.35 shares of onsemi, and whatever onsemi does from one day to the next is, literally, what the deal is worth the next day.

So "about $7 billion" was true for roughly a day, and the tag has been a different number every trading day since. Right now onsemi is at $74.21, which makes the consideration worth about $100.18 for each share of Synaptics. Synaptics itself is at $97.66 — about 2.5% below its own conversion value. That is a small discount for a deal that is supposed to close around the middle of next year, and the size of it is a way of saying the market mostly believes this deal closes. The two stocks even move like the same trade now: each is down about 10% over the past five days, in lockstep, because to the arbitrageurs one of them has become a claim on the other.

That lockstep is the right way to read the insider paperwork. The mechanical future of the company is already written: a merger subsidiary will be folded into Synaptics, with the company surviving as a wholly owned subsidiary of onsemi. In that world, an insider's sale of Synaptics shares is not really a statement about Synaptics anymore; it is a statement about what the closing, and the onsemi stock you receive at it, will be worth. Consider the one filing this week that did involve actual selling. Vikram Gupta, Synaptics' chief product officer, had his restricted, performance, and market-based units deliver into his account on Aug. 17 — with 17,705 shares withheld along the way to cover the tax bill — and the next day he sold 4,277 shares at prices from $102.77 to $104.85. Insider sells into the deal: a headline! Except the sales ran through a trading plan dated Sept. 12, 2025, nine months before the merger existed. Rule 10b5-1 lets insiders trade on autopilot — the trades are insulated from whatever they might know, as long as the plan was signed when they didn't have any inconvenient information — so this "insider sale" is mechanically older than the deal it supposedly comments on.

And there is an even cleaner version of the same point. He was selling Synaptics shares at about $103 a share, in the neighborhood of the conversion value at the time, which means that economically he was selling onsemi stock — the thing he was going to be paid in anyway. The only view embedded in that trade is a view about the consideration, not a view about the target.

Which brings us back to the amended form that changed nothing. The 776 units were "unearned" performance stock units — compensation that was going to pay out only if Synaptics hit performance targets. In a merger, unearned target equity becomes a small negotiation between the parties: does the acquirer convert the awards into its own stock, treating them as earned at the deal price, or do they quietly evaporate? I could not find, in the public record, exactly what this merger agreement says will happen to unearned Synaptics awards; the amendment that deletes precisely the "unearned" units is the disclosure system's footprint of that open question. The plausible story is the tidy one: as the deal's paperwork gets assembled — the proxy, the registration statement, the ownership tables that say how much each insider owns — the old numbers get re-audited, and a year-old overstatement finally gets corrected. To the alert reader it sounds like insider news and is, in fact, one of the smaller pieces of the merger machine.

The joke of this whole genre of filing is that people read insider forms to ask whether the people closest to the company like its stock. When the company is being extinguished into someone else's stock at a fixed ratio, the question stops having an answer, because there is no "Synaptics stock" left for anyone to have a view about. The real informational events of this deal were elsewhere: the Federal Trade Commission's early termination of the Hart-Scott-Rodino waiting period — the mandatory pre-closing antitrust review window — a hurdle that cleared a lot faster than the closing will arrive. From here the interesting bets are about onsemi, not the company being acquired: whether a stock that is up about 37% this year and whose options are pricing in implied volatility near 66% is a currency anyone would want to be paid in. That is the question an insider's "sale" answers when it answers anything: not "the stock is bad," but "the payment is in someone else's hands, maybe."

Anyway, the economic point is simple. A cash deal has a price; a stock deal has an exchange rate, which is not a number you can look up once and be done with. On the day this deal closes, the last thing a Synaptics shareholder will notice — insider or otherwise — is that the ticker changed and became 1.35 of a piece of someone else. The amended Form 4 was just the paperwork noticing it first. A more honest reading of an "insider trading" filing that reports no trading is that there is nothing for an insider to trade on anymore: the shares already have a single buyer at a single ratio, and there is nothing left for the market to discover. That is the whole machine, and it is not particularly sinister. It is just arithmetic, wearing a disclosure form.