Apple Says OpenAI Stole Its Trade Secrets. The Real Number Is 400 Engineers and $280 Million in Replacement Costs.

Four hundred former Apple employees now work at OpenAI, a number buried on page 31 of the 41-page trade secret complaint Apple filed Friday in the U.S. District Court for the Northern District of California. Accusations of espionage involving stolen laptops and authentication exploits make for better headlines, but 400 engineers walking out the door to a single competitor is where the real money is.

Two names anchor the suit. Chang Liu, a former senior system electrical engineer, spent eight years at Apple before joining OpenAI in January. He allegedly kept his Apple laptop, exploited a "rare, previously unknown" authentication bug to access Apple's internal network, and downloaded dozens of confidential hardware files while on OpenAI's payroll. His reaction, per the complaint: "LOL" and "so funny." Tang Yew Tan, a 24-year Apple veteran and former VP of product design for iPhone and Apple Watch, is now OpenAI's chief hardware officer. He allegedly emailed himself supplier data before departing, used confidential Apple codenames to probe interview candidates about unreleased products, and directed applicants still at Apple to bring "actual parts" for "show and tell" sessions. One candidate's response, quoted in the filing: he "didn't even know we could take those from the office."

Replacement Math

Stolen files make headlines, but talent drain costs real money, and Apple's own filings let us calculate how much.

Apple's FY2025 10-K reports 166,000 employees, roughly 41 percent in engineering, and the hardware engineering subset that spans iPhone, Mac, Watch, AirPods, and Vision Pro across electrical, mechanical, systems, and industrial design disciplines accounts for an estimated 25,000 to 30,000 of those roles. Four hundred departures to a single rival: 1.3 to 1.6 percent of Apple's entire hardware brain trust.

SHRM pegs the replacement cost for specialized technical roles at 1.5 to 2 times annual compensation, and senior hardware engineers at Apple in the Bay Area earn roughly $350,000 per year in total comp including base salary, restricted stock units, and bonuses. At two times that figure, 400 engineers deep: $280 million just to recruit, hire, and onboard replacements, a figure that understates the damage because it does not account for the institutional knowledge those engineers carried in their heads. Which suppliers hit tolerances on thermal adhesive compounds, which antenna designs failed at which frequencies, which manufacturing processes Apple refined over decades of iteration are not skills that appear on a resume or get recovered through a job listing.

Waymo Precedent, Scaled

In 2018, Waymo settled with Uber for $245 million in equity, 0.34 percent of Uber's $72 billion valuation, after alleging that a single engineer named Anthony Levandowski downloaded 14,000 proprietary files containing LiDAR blueprints before leaving to found Otto, which Uber acquired for $680 million. Waymo had sought $3 billion.

Per-file value at that settlement: $17,500 each. Apple alleges "dozens" of files from Liu alone but frames the theft as institutional, reaching from rank-and-file technical staff all the way to the chief hardware officer, and if Waymo's valuation ratio were applied to OpenAI's $300 billion, the exposure would land at $1.02 billion.

A sharper comparison uses the acquisition ratio: Uber paid $680 million for Otto, Levandowski's tainted startup, and the settlement came to 36 percent of that purchase price. OpenAI paid $6.5 billion for io Products, co-founded by Tan and former Apple design chief Jony Ive, and applying the same ratio yields a potential exposure of $2.34 billion.

Was io an IP Acquisition?

Ive is not named as a defendant, appearing only in footnoted links, but the deal's structure invites scrutiny.

io Products was roughly one year old at acquisition, with no shipped products, no revenue, and a 23 percent stake already held by OpenAI before the all-stock transaction valued the company at $6.5 billion based on OpenAI's $300 billion valuation. What io had was Ive's design brand, a team of former Apple hardware leaders including Tan, and the operational knowledge those leaders carried from decades building the most profitable consumer device in history.

Apple alleges Tan "methodically" used its confidential information at OpenAI, including supplier relationships. It says OpenAI employees approached an Apple supplier with a "secret metal finishing technique," and the supplier executed the work under the belief OpenAI had permission. If those claims hold, part of that $6.5 billion bought access to Apple's operational playbook through a startup staffed by Apple alumni.

Retention Panic

Normal attrition does not trigger emergency bonuses, but in March 2026 Apple started issuing out-of-cycle stock grants of $200,000 to $400,000 to iPhone Product Design engineers, with four-year vesting schedules, an extraordinary move for a company as disciplined about compensation as Apple and one that reads as an alarm pulled in broad daylight.

OpenAI is dangling packages exceeding $1 million per year, offering pre-IPO equity in a $300 billion company against Apple's mature stock at $310 a share in a $4.5 trillion one, and departing engineers have reportedly cited frustration with incremental product changes and stagnant share performance. Apple even canceled an overseas team offsite because executives feared keeping too many people away from Cupertino might accelerate defections.

Limitations

Apple's complaint is a plaintiff's document drafted to present its strongest case, and OpenAI denies all wrongdoing; none of these allegations have been tested in court. Our replacement cost uses SHRM industry multipliers and public Bay Area compensation data, not Apple's internal figures, and the 400-employee count comes solely from Apple's filing without independent verification. Waymo-Uber involved LiDAR technology at a startup-era company, not consumer hardware IP at a $300 billion enterprise. We do not know what Liu's downloaded files contained or whether any Apple trade secrets have been incorporated into OpenAI's hardware designs, and Apple states in its own filing that it "lacks visibility into what's been happening behind closed doors at OpenAI."

OpenAI's Strongest Defense

California Business and Professions Code Section 16600 bans non-competes, and the labor mobility doctrine is foundational to how Silicon Valley works: hiring 400 people from a competitor is not just legal in California, it is the operating model on which the entire technology industry was built. Stanford Law professor Mark Lemley put it plainly, noting that much of what Apple alleges "is not illegal in California," and the legal question comes down to a narrower chain of evidence. Did specific people take specific documents, and did OpenAI direct them to? If Apple cannot connect stolen files to corporate instructions, the case shrinks from an institutional conspiracy to two rogue-employee claims worth a fraction of $1 billion.

What to Watch

Forget the laptops and follow the money. Replacing 400 hardware engineers costs $280 million before institutional knowledge losses are factored in, and Waymo-Uber math adjusted for OpenAI's valuation puts potential exposure above $1 billion. io Products, a one-year-old company with no revenue and a roster of ex-Apple leaders, suddenly looks less like a design partnership and more like the most expensive talent raid in Valley history. If you work in hardware engineering at a major technology company, the lesson is concrete: your institutional knowledge carries a dollar value, your departure agreement has teeth, and the line between bringing your skills to a new employer and bringing your employer's secrets just got a federal case to define it.