Two Volkswagen engineers didn’t get caught because federal investigators are brilliant at reading corporate calendars. They got caught, in part, because one of them searched for the statute of limitations on insider trading eight days before the rest of the world found out what he already knew. That detail, buried in an indictment unsealed Friday by the U.S. Attorney’s Office for the Southern District of New York, tells you almost everything worth knowing about this case. The money is almost beside the point.
According to prosecutors, Michael Stamp and Marcus Plank were Volkswagen Group employees on temporary assignment from Germany, working in the United States, when they gained access to confidential details of what would become a multibillion-dollar joint venture between Volkswagen and Rivian Automotive. Between April and July of 2024, while the deal was still being negotiated privately, the two men bought Rivian stock and options. When Volkswagen and Rivian announced the joint venture that June, Rivian shares jumped 23% in a single day. Stamp and Plank sold, walking away with roughly $250,000 and $50,000 in illegal profits respectively, according to the indictment, with a close family member of Plank’s picking up another $12,000 riding the same information.
Insider trading cases are common enough that this one could have been a one-day story: two guys, some options, a federal indictment, next. But look past the dollar figures, and this case is really about something the auto industry doesn’t like to say out loud. Modern joint ventures hand material, stock-moving information to line engineers years before it ever reaches a shareholder, and the industry’s compliance training hasn’t caught up to that reality.
Here’s the detail worth sitting with. Stamp and Plank weren’t corporate development staff with calendar invites to merger talks. They were engineers, based in San Jose, California, embedded in Rivian’s world months before either company issued a press release. That’s not unusual. It’s how these deals actually get built now. The public version of a joint venture is two executives on a stage. The private version is dozens of engineers scoping a technical handoff, in this case Rivian’s electrical architecture and software stack, long before lawyers finish drafting a term sheet. Those engineers see the real shape of a deal before institutional investors ever do. Two of them, prosecutors say, couldn’t resist trading on it.
Context matters here. Volkswagen didn’t hand over up to $5 billion to a smaller, unprofitable American EV maker because it wanted a marketing partnership. It did it because its in-house software division, Cariad, had spent years and billions of euros failing to build the vehicle software architecture Volkswagen needed for its next generation of EVs. Rivian had already built one. The joint venture let Volkswagen effectively rent that technology rather than admit defeat outright, a decision that looks even more urgent given how the rest of Volkswagen’s financial picture has unfolded since.
Rivian, for its part, needed the validation almost as much as the capital. This was a company whose stock had cratered more than 90% from its IPO highs, burning cash and facing open questions about whether it would still be building vehicles by the end of the decade. A partnership with one of the largest automakers on earth wasn’t just good news. It was proof of survival, which helps explain why shares jumped 23% in a single day, and why two engineers who saw the deal coming decided the information sitting in their inboxes was worth the risk.
Here’s the second detail that should make anyone in the auto industry’s engineering ranks pay attention. The profits here were modest by Wall Street standards, a combined $312,000 across two defendants and one family member. The maximum penalties are not. Each man faces a conspiracy charge carrying up to five years, plus two separate securities fraud counts carrying maximum sentences of 20 and 25 years respectively. Insider trading law was never built to be proportionate to the size of the trade. It’s built to be disproportionate, because the entire point is deterrence, a fact that becomes very real, very fast, for an engineer who thought a few thousand dollars in options was a victimless bet.
Then there’s the digital trail, which is where this case stops being a routine SEC referral and starts reading like a cautionary tale for anyone with access to a sensitive company calendar. Eight days before the joint venture became public, Stamp is alleged to have searched for the statute of limitations on insider trading. After the announcement, prosecutors say, a close family member of Plank’s ran a search, in German, asking how insider trading is prosecuted. Neither search stopped anyone from selling. Both are now evidence prosecutors are using to argue the defendants understood exactly what they were doing while they were doing it.
None of this is new territory for federal prosecutors. What’s newer is the shape of the deals producing these cases. A decade ago, an auto industry insider-trading case would have involved two legacy automakers, negotiated by a small circle of corporate development executives and bankers who had sat through insider-trading training more times than they could count. The deals reshaping the industry today look different. They involve legacy manufacturers investing in smaller, publicly traded EV and software companies, which means the circle of people who see material nonpublic information now extends deep into engineering teams hired to write code and design wiring harnesses, not to manage federal disclosure obligations. Volkswagen just became the case study in what happens when that engineering team never gets the same insider-trading briefing the finance department gets.
There’s an uncomfortable echo here for Volkswagen specifically. The company spent the better part of a decade rebuilding trust after Dieselgate, a scandal that was also, at its core, a story about individual engineers making decisions that created enormous legal exposure for the company around them, several of whom eventually went to prison years after the fact. This is a different kind of fraud, aimed at markets rather than regulators, and nobody is alleging Volkswagen the corporation did anything wrong. But the pattern of individual engineers holding consequential secrets, making calls no compliance department signed off on, and leaving the parent company to absorb the legal fallout years later is one Volkswagen has now lived through twice.
Announcing a joint venture is easy. Keeping the several dozen engineers who actually have to build it quiet until the press release goes out is the real test of a deal team, and on this one, Volkswagen failed it in federal court. The lesson for the rest of the industry isn’t really about Rivian, or even about Volkswagen. It’s that as automakers keep striking smaller, faster, more entangled partnerships with EV and software upstarts, the list of employees who can move a stock price with a phone call is a lot longer than most compliance departments assume. Two engineers in San Jose just proved it, and left a search history proving they knew it too.