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Stocks/SIMO/SEC Filings/SCHEDULE 13G/A Nov 5, 2026

SIMO SCHEDULE 13G/A: SEC filing

Fidelity Management & Research Company

Filed with the SEC on Nov 5, 2026 · accession 0000315066-26-002848

SIMO filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Nov 5, 2026. A report the company filed with the SEC (the US market regulator). The stock moved -14.4% by the first close after the filing.

Summary of the filing

Fidelity Management & Research Company filed an amended Schedule 13G indicating a change in its passive ownership position in Silicon Motion Technology Corp.

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Key details

Filer/institutional investorFidelity Management & Research Company
IssuerSilicon Motion Technology Corp

How SIMO stock reacted

Close before

$182.54

Nov 4, 2026

First close after

-14.39%

$156.27

5 trading days

—

Since filing

-10.84%

$162.76

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Frequently asked questions

What did SIMO file with the SEC on Nov 5, 2026?

SIMO filed a SCHEDULE 13G/A (SEC filing). Fidelity Management & Research Company filed an amended Schedule 13G indicating a change in its passive ownership position in Silicon Motion Technology Corp.

How do I read a SCHEDULE 13G/A?

A report the company filed with the SEC (the US market regulator). Start with the summary, then the key amounts and names. Compare it with the company’s earlier filings.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A SCHEDULE 13G/A (schedule 13g/a): A report the company filed with the SEC (the US market regulator).

How did SIMO stock react to this filing?

SIMO closed at $182.54 before the filing and $156.27 on Nov 5, 2026 (-14.39%).

Other SIMO SEC filings

  • 6-K · SEC filingOct 29, 2026
  • 6-K · SEC filingOct 16, 2026
  • 6-K · SEC filingOct 8, 2026
  • 6-K · SEC filingSep 22, 2026
  • 6-K · SEC filingAug 14, 2026
  • 6-K · SEC filingAug 11, 2026
  • 6-K · SEC filingAug 10, 2026
  • 6-K · SEC filingJul 30, 2026
  • 6-K · SEC filingJul 24, 2026
  • 6-K · SEC filingJul 8, 2026

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Source: SEC EDGAR filing 0000315066-26-002848. The summary and key details are extracted by SEPT from the filing and may contain errors. Price reaction uses daily closing prices. Not financial advice.