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AI, semiconductors & telecommunications / 2015–2024

UMC admitted taking Micron DRAM secrets—but the PRC company accused of benefiting was acquitted S1 S2 S3

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. S1 S2 S3

Evidence at a glance How labels work

Evidence status Adjudicated
Case-level nexus context Documented affiliation or support
Public sources 3 Automated checks verify citation linkage; editorial review judges support
Evidence foundation Primary adjudicative record A linked judgment, opinion, verdict, or signed plea anchors the adjudicated posture; source notes distinguish any remaining allegations. S3
Publication record Published Aug 23, 2026 Reviewed Aug 25, 2026 · Next Feb 27, 2027

Evidence status and PRC-state nexus answer different questions and must not be joined across different actors. Actor-specific outcomes appear below.

Compare this file
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. S2 S3 S1

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. S1 S2

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. S2 S3

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. S1 S2

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 six-part framework asks the same questions of every file. Each stage carries its own evidence state; a listed stage can be alleged, inferred, interrupted, disputed, or not established. The structure does not manufacture a completed transfer or harm.

  1. 01

    Relationship context Documented

    Hiring and technology agreement

    Former Micron personnel joined UMC as UMC worked with Jinhua on DRAM capability. S1 S2

  2. 02

    Access assessed Documented

    Micron Taiwan records

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

  3. 03

    Acquisition assessed Adjudicated or admitted

    One trade secret admitted

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

  4. 04

    Movement assessed Documented

    Files entered UMC program

    The indictment alleged employee-carried files moved into work associated with the UMC-Jinhua project. S1 S2

  5. 05

    Downstream use assessed Not established

    Jinhua benefit alleged, not proved

    Prosecutors alleged the material supported Jinhua's DRAM program, but the court acquitted Jinhua on every count; the cited adjudicated record therefore does not establish that Jinhua received or used a stolen trade secret. S1 S3

  6. 06

    Consequences assessed Adjudicated or admitted

    Plea and acquittal

    UMC paid a $60 million criminal fine; Jinhua received a complete judgment of acquittal. S2 S3

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. S1 S3

Subject response / procedural context

  • UMC accepted responsibility through a negotiated plea. Jinhua denied wrongdoing, proceeded to trial, and obtained a complete acquittal. S2 S3

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 S1 S2 S3

Outcome: Pleaded guilty; $60 million fine S1 S2 S3

Actor-specific PRC nexus No state nexus established

UMC admitted possessing a stolen Micron trade secret, but its plea did not establish PRC-state direction or establish guilt by its state-owned commercial partner. S1 S2 S3

Fujian Jinhua Integrated Circuit Company

PRC state-owned technology partner and charged defendant S1 S2 S3

Outcome: Acquitted on all counts S1 S2 S3

Actor-specific PRC nexus Documented affiliation or support

Fujian Jinhua is PRC state-owned, but the court acquitted it on every count; state ownership is not a finding of criminal conduct. S1 S2 S3

Former Micron Taiwan employees

Engineers accused of moving protected files into the UMC program S1 S2 S3

Actor-specific PRC nexus Unknown / insufficient public evidence

The cited record alleges that former employees moved files into the UMC program, but it does not separately establish PRC-state direction for those individuals. S1 S2 S3

Originator / affected institution

Micron Technology

Developer and owner of the DRAM manufacturing trade secrets S1 S2 S3

07 / Consequences

Documented, attributed, potential, and unknown consequences

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. S2 S3

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.

    official summary 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

    official summary 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.

    adjudicative record court record

12 / Reference

Cite this dossier

Use the permanent URL and review date below so readers can identify the version of the public-source record you consulted.

ChinaSteals. “UMC admitted taking Micron DRAM secrets—but the PRC company accused of benefiting was acquitted.” CS-022. Published Aug 23, 2026; last reviewed Aug 25, 2026. https://chinasteals.com/cases/umc-micron-jinhua-dram/

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