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← All case files CS-022 / Last reviewed Aug 23, 2026 Jump to sources ↓

AI, semiconductors & telecommunications / 2015–2024

UMC admitted taking Micron DRAM secrets—but the PRC company accused of benefiting was acquitted

A Taiwan semiconductor company pleaded guilty to stealing a Micron trade secret during work connected to Fujian Jinhua. Four years later, the federal judge found Jinhua not guilty on every criminal count.

Finding

The record has two distinct outcomes that cannot be merged: UMC's guilty plea and $60 million fine are adjudicated, while Fujian Jinhua's 2024 bench-trial acquittal means the alleged PRC beneficiary was not convicted.

01 / Executive brief

Executive summary

The 2018 indictment alleged that former Micron Taiwan employees moved DRAM manufacturing secrets to United Microelectronics Corporation, which had entered a technology-cooperation agreement with the PRC state-owned Fujian Jinhua Integrated Circuit Company. In 2020, UMC pleaded guilty to one count of receiving and possessing a stolen Micron trade secret and agreed to a $60 million fine and cooperation. S1S2

That plea did not adjudicate Jinhua's guilt. After a 2024 bench trial, the district court granted Jinhua's motion for judgment of acquittal and found it not guilty on all counts. This dossier therefore treats UMC's admitted theft and Jinhua's acquittal as equally essential facts, rather than transferring one defendant's plea to another. S2S3

Diagram showing rows, columns, decoders, and memory cells inside a DRAM chip
illustration

Dynamic random-access memory depends on tightly integrated cell, process, and manufacturing know-how. This open diagram explains the technology class; it is not Micron evidence from the case.

Inductiveload / Wikimedia Commons · Public domain

02 / The vignette

What happened

A semiconductor hiring chain moved know-how

The prosecution began with employee mobility in Taiwan's semiconductor sector. Engineers who had worked at Micron's Taiwan operation joined UMC, and the indictment alleged that protected DRAM process files followed them into a program associated with UMC's cooperation with Jinhua. S1S2

UMC accepted criminal responsibility

In October 2020, UMC admitted receiving and possessing one Micron trade secret that had been stolen without authorization. The company agreed to a $60 million fine—then the second-largest ever imposed under the Economic Espionage Act—and to assist the continuing prosecution. S2

The alleged beneficiary won at trial

Jinhua exercised its right to trial. In February 2024, the judge concluded that the government had not proved the criminal charges beyond a reasonable doubt and entered not-guilty findings on every count. The result is a control case for this archive: organizational relationships and an upstream plea can support investigation, but they do not substitute for proof against a separate defendant. S3

03 / Anatomy

How access became transfer

This chain reconstructs the sequence supported by the cited record. It does not imply that every legitimate relationship follows the same path.

  1. 01

    Relationship established

    Hiring and technology agreement

    Former Micron personnel joined UMC as UMC worked with Jinhua on DRAM capability. S1S2

  2. 02

    Sensitive access gained

    Micron Taiwan records

    The recruited engineers had held access to Micron's protected manufacturing information. S1

  3. 03

    Information acquired

    One trade secret admitted

    UMC admitted receiving and possessing a Micron trade secret stolen without authorization. S2

  4. 04

    Assets moved

    Files entered UMC program

    The indictment alleged employee-carried files moved into work associated with the UMC-Jinhua project. S1S2

  5. 05

    Technology put to use

    Jinhua benefit alleged, not proved

    Prosecutors alleged the material supported Jinhua's DRAM program, but the court acquitted Jinhua on every count. S1S3

  6. 06

    Competitive harm

    Plea and acquittal

    UMC paid a $60 million criminal fine; Jinhua received a complete judgment of acquittal. S2S3

04 / Evidence boundary

What is established—and what is not

Established in the record

  • UMC admitted receiving and possessing one Micron trade secret that had been stolen without authorization. S2
  • Fujian Jinhua was acquitted on all counts and is not treated as convicted in this dossier. S3

Uncertain, limited, or unresolved

  • The indictment's broader allegations against Jinhua did not produce a conviction; the court found the government's proof insufficient at trial. S1S3

Subject response / procedural context

  • UMC accepted responsibility through a negotiated plea. Jinhua denied wrongdoing, proceeded to trial, and obtained a complete acquittal. S2S3

05 / Sequence

Timeline

  1. DRAM partnership develops

    UMC and Jinhua pursued cooperation as former Micron personnel entered the program. S1

  2. Federal indictment

    The United States charged UMC, Jinhua, and three individuals with economic-espionage and trade-secret offenses. S1

  3. UMC pleads guilty

    UMC admitted possessing one stolen Micron trade secret and accepted the fine and cooperation terms. S2

  4. Jinhua acquitted

    The court found Jinhua not guilty on all counts after trial. S3

06 / People and institutions

Who appears in the public record

United Microelectronics Corporation (UMC)

Taiwan semiconductor company that admitted possessing a stolen Micron trade secret

Outcome: Pleaded guilty; $60 million fine

Fujian Jinhua Integrated Circuit Company

PRC state-owned technology partner and charged defendant

Outcome: Acquitted on all counts

Former Micron Taiwan employees

Engineers accused of moving protected files into the UMC program

Originator / affected institution

Micron Technology

Developer and owner of the DRAM manufacturing trade secrets

07 / Consequences

Documented and attributed harm

Court finding

UMC's admitted possession exposed Micron's DRAM process information; the $60 million fine is a criminal penalty, not a measure of Jinhua's responsibility or Micron's total loss. S2S3

08 / Hindsight analysis

Where leadership could have seen risk

These are our analytic judgments based on the public record, not court findings. They are framed to improve controls without treating nationality as a risk factor.

Hiring moved more than labor

A cluster of engineers carried a risk that protected files and tacit process knowledge would move with them into a rival program.

Partnership blurred attribution

A corporate technology relationship created a plausible transfer pathway but did not prove that every partner committed the same offense.

09 / Apply the lesson

Actions leaders can take

  1. companies

    Audit clustered departures

    Escalate team-level moves to a direct competitor and examine shared repositories, downloads, and post-exit product overlap.

  2. companies

    Control clean-room inputs

    Require documented provenance and clean-room development when hiring engineers from competitors into an adjacent manufacturing program.

  3. both

    Keep defendants separate

    In investigations and public reporting, never transfer a plea, judgment, or allegation from one company or person to another.

10 / Source record

Sources

Links point to the public record reviewed for this file. Government releases can summarize court proceedings but remain government-authored sources; the source note identifies those limits.

  1. S1

    PRC State-Owned Company, Taiwan Company, and Three Individuals Charged with Economic Espionage ↗

    U.S. Attorney's Office, Northern District of California · Published Nov 1, 2018 · Retrieved Aug 23, 2026

    Charging allegations, not findings against Jinhua.

    government release
  2. S2

    Taiwan Company Pleads Guilty to Trade Secret Theft in PRC State-Owned Company Case ↗

    U.S. Department of Justice · Published Oct 29, 2020 · Retrieved Aug 23, 2026

    government release
  3. S3

    Minutes: Judgment of Acquittal in United States v. Fujian Jinhua ↗

    U.S. District Court, Northern District of California · Published Feb 27, 2024 · Retrieved Aug 23, 2026

    Mirror of the federal court minutes documenting the complete acquittal.

    court record