Apple has sent legal preservation letters to roughly 40 former employees who now work at OpenAI, instructing them to hold on to any documents and communications relevant to its trade secret lawsuit. The Financial Times reported the letters this morning, one week after Apple sued OpenAI in federal court, and they reach well past the two engineers Apple actually named as defendants. The letters are not accusations. They are something more telling: Apple freezing the evidence before it decides how much bigger this case gets.

  • About 40 letters went out to ex-Apple staff now at OpenAI, per the Financial Times. Apple's own complaint says more than 400 former Apple employees work there.
  • Only two people are named defendants so far: Tang Tan, OpenAI's chief hardware officer and a 24-year Apple veteran who led product design, and Chang Liu, a former senior system electrical engineer now on OpenAI's hardware team.
  • Apple's filing says it is concerned about data that OpenAI and the named co-defendants have already deleted. The letters stop that clock for everybody else.
  • OpenAI denies the claims, saying it is not aware of any evidence the complaint has merit.
How far Apple's OpenAI case now reaches More than 400 former Apple employees work at OpenAI. Apple sent preservation letters to about 40 of them. Only two, Tang Tan and Chang Liu, are named defendants alongside OpenAI itself. APPLE v. OPENAI / WHO IS IN SCOPE 400+ former Apple employees now working at OpenAI per Apple's complaint ~40 sent legal preservation letters this week reported by the FT 2 named defendants: Tan, Liu + OpenAI Apple calls what it has found so far only the tip of the iceberg genztech.blog
Fig 1 The gap between the three numbers is the story. Apple named two people, papered 40, and told the court that more than 400 ex-Apple employees now sit inside OpenAI. Preservation letters are how a plaintiff keeps the middle number's evidence alive while it decides whether to move people into the first.

What exactly did Apple send?

Preservation letters, not lawsuits and not subpoenas. Their operative demand is narrow and unglamorous: retain all relevant documentation so that it can be produced when the time comes. Nobody who received one has been accused of anything, and receiving one does not make a person a defendant or even a witness yet.

RelatedKimi K3 Is the Largest Open Model Ever, and It Is Not Cheap

The context is what gives them weight. Apple filed suit on July 10, 2026 in the U.S. District Court for the Northern District of California against OpenAI, Tang Tan, and Chang Liu, alleging trade secret misappropriation and breach of contract. It is asking for an injunction barring OpenAI from using any Apple information in developing its AI hardware device, plus damages. Apple says it wrote to OpenAI in February raising these concerns and got no reply; OpenAI has since blamed an email mix-up. Then, a week after filing, roughly 40 more letters went out.

Why does a preservation letter matter more than it sounds?

Because its real function is to start a clock, and the clock is worth more than the paper.

Under the federal rules, a duty to preserve evidence attaches once litigation is reasonably anticipated. The fight over that trigger date is normally messy: a party argues it had no idea a case was coming, so its ordinary housekeeping was innocent. A dated letter in your inbox removes the argument. After it lands, routine deletion stops being routine.

That matters more in 2026 than it would have a decade ago, because modern corporate communication deletes itself by default. Chat retention windows expire. Disappearing messages are a setting, not a decision. Devices get refreshed, trash empties itself on a 30-day timer, and none of it requires anyone to intend anything. Absent a preservation notice, a year of relevant messages can evaporate through pure administrative gravity.

Apple's complaint already flags this. It says Apple is concerned about data that OpenAI and the named co-defendants have already deleted. Set aside whether that concern is well founded, which is genuinely unresolved. Its effect on strategy is not ambiguous: having said it once, Apple has every reason to make sure it never has to say it again about anyone else. Hence 40 letters.

The escalation path from here is Rule 37(e). If a court finds a party lost electronically stored information it had a duty to preserve, remedies run from curative measures up to an adverse-inference instruction where it finds intent to deprive another party of the information. That instruction is the heavy artillery of a trade secrets case, because it lets a jury be told it may assume the missing material would have been unfavorable. A plaintiff who cannot prove what was taken can sometimes still win on what was destroyed.

How did the case get here?

  1. Feb 2026Apple writes to OpenAI raising trade secret concerns No response. OpenAI later blames an email mix-up.
  2. Jul 10, 2026Apple sues OpenAI, Tang Tan and Chang Liu N.D. Cal. Seeks an injunction plus damages.
  3. Jul 14, 2026OpenAI publicly denies the allegations Not aware of any evidence the complaint has merit.
  4. Jul 17, 2026FT reports preservation letters to ~40 ex-Apple staff Ten times the number of named defendants.
  5. NextAn amended complaint or third-party subpoenas The tell for whether the 40 become witnesses or defendants.

Who is actually exposed here?

Not primarily the 40. Ten percent of the ex-Apple population at OpenAI got a letter, which reads less like a target list than like the set of people whose inboxes plausibly touch the hardware program. The specific allegations in Apple's complaint are narrower and stranger than the headcount suggests:

  • Tan allegedly encouraged Apple interviewees to bring actual parts to their interviews for show-and-tell sessions.
  • Apple describes an exchange between Tan and a then-current Apple employee about Tan retaining access to Apple's internal network through a device he did not return when he left.
  • Liu is alleged to have taken an Apple laptop.
  • OpenAI allegedly had a trusted Apple manufacturing partner run Apple's proprietary metal-finishing process, while letting that partner believe the work had Apple's blessing.

That last one is the one to watch, and it is the one most coverage buries. Trade secret cases usually live or die on a single question: did the secret actually move, or did skilled people simply keep being skilled somewhere else? Testimony from either side is discounted as self-interested. A supplier is different. A manufacturing partner that physically ran a proprietary finishing process has purchase orders, process specs, tooling records, and email, and it has no reason to protect either party. If Apple's version is right, that partner is the most credible neutral witness in the case. If it is wrong, that is where it breaks first.

Related29 Countries Sign China-Led AI Governance Body in Shanghai

What it means for the market

Apple is not meaningfully exposed financially here. This is roadmap defense, not a revenue event, and no plausible outcome moves a company of Apple's size on the numbers.

The exposure sits on OpenAI's side and it is specific. OpenAI paid $6.4 billion for Jony Ive's IO Products to build a ChatGPT-powered device, and the injunction Apple is asking for would bar OpenAI from using Apple-derived information in precisely that product. An injunction would not kill the device. It would force a documented clean-room rebuild of anything Apple can trace, and that costs time in the one market where OpenAI is furthest behind and has already paid the most to catch up.

The signal for investors is timing rather than liability. OpenAI is moving toward a widely expected IPO, and live trade secret litigation naming a sitting chief hardware officer is the kind of thing that earns its own risk-factor paragraph. The concrete thing to watch is whether Apple moves for a preliminary injunction. Damages are a lagging remedy that a company with OpenAI's balance sheet can absorb; an injunction sought early is Apple saying the schedule is the point. This is factual analysis, not investment advice.

What to watch · next 90 days
  • An amended complaint. If any of the 40 are added as defendants, the letters found something.
  • A preliminary injunction motion. The tell that Apple wants the hardware slowed now rather than paid for later.
  • The manufacturing partner. Named, subpoenaed, or absent, that supplier decides how much of this is provable.
  • A spoliation motion. If Apple's deleted-data concern becomes a Rule 37(e) fight, the case shifts from what was taken to what was destroyed.

Our take

The lawsuit was the headline. The letters are the actual news. Suing two engineers is an ordinary outcome when a rival hires your hardware team; papering 40 more people a week later is not. It says Apple believes the complaint it filed is smaller than the conduct it suspects, and that it is building the record before anyone's messages roll off a retention timer. Apple's own filing gives away the worry when it flags data it says was already deleted. Read those two facts together and the sequence is legible: fix the notice date, freeze everything, then decide who to add.

The risk for Apple is that this becomes what OpenAI will certainly call it, an effort to make hiring away from Apple expensive. More than 400 ex-Apple employees at OpenAI is not evidence of anything by itself. California does not enforce noncompetes, engineers are entitled to change jobs, and the general expertise they carry out the door is theirs. The boundary between skill and secret is the whole case, and headcount does not locate it. Apple's stronger material is the concrete stuff: parts carried into interviews, a returned-employee device that allegedly kept network access, a supplier running a proprietary process under a misapprehension. If those hold up, 40 letters will look like diligence. If they do not, they will look like pressure, and OpenAI will spend the discovery period saying so.

Primary sources

Original analysis by GenZTech. Reporting informed by the Financial Times. Not legal advice.