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ALNY SCHEDULE 13G/A: SEC filing

Capital World Investors

Filed with the SEC on · accession 0001422849-26-000177

ALNY filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Nov 13, 2026. Capital World Investors filed an amended Schedule 13G/A disclosing beneficial ownership of 13,934,539 shares, or 10.4%, of Alnylam Pharmaceuticals common stock as of September 30, 2026. The stock moved +5.4% by the first close after the filing.

Summary of the filing

Capital World Investors filed an amended Schedule 13G/A disclosing beneficial ownership of 13,934,539 shares, or 10.4%, of Alnylam Pharmaceuticals common stock as of September 30, 2026. The filing is a passive investment disclosure under Rule 13d-1(b), with no intent to influence control of the company.

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Key details

Shares beneficially owned by Capital World Investors$13.9M
Shares believed to be outstanding$133.9M
Filer / beneficial owner of 10.4% of alnylam pharmaceuticals common stockCapital World Investors
Issuer / subject companyAlnylam Pharmaceuticals, Inc.
Vice president and senior counsel, capital research and management companyTimothy J. Moon

How ALNY stock reacted

Close before

$156.65

Nov 12, 2026

First close after

+5.36%

$165.04

5 trading days

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Since filing

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Frequently asked questions

What did ALNY file with the SEC on Nov 13, 2026?

ALNY filed a SCHEDULE 13G/A (SEC filing). Capital World Investors filed an amended Schedule 13G/A disclosing beneficial ownership of 13,934,539 shares, or 10.4%, of Alnylam Pharmaceuticals common stock as of September 30, 2026. The filing is a passive investment disclosure under Rule 13d-1(b), with no intent to influence control of the company.

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 ALNY stock react to this filing?

ALNY closed at $156.65 before the filing and $165.04 on Nov 13, 2026 (+5.36%).

Other ALNY SEC filings

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