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ONC SCHEDULE 13D/A: SEC filing

Baker Brothers Life Sciences, L.P. and affiliated entities

Filed with the SEC on · accession 0001104659-26-108269

ONC filed a SCHEDULE 13D/A (schedule 13d/a) with the SEC on Sep 16, 2026. A report the company filed with the SEC (the US market regulator). The stock moved +0.5% by the first close after the filing.

Summary of the filing

Baker Brothers Life Sciences, L.P. and affiliated entities filed an amended Schedule 13D reporting beneficial ownership of 114,387,735 ordinary shares, or 7.7% of BeOne Medicines Ltd.'s outstanding class.

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Key details

Total ordinary shares beneficially owned by Baker Brothers entities$114.4M
Ordinary shares owned by Baker Brothers Life Sciences, L.P.$104.9M
Ordinary shares owned by 667, L.P.$9.5M
Beneficial owner / filerBaker Brothers Life Sciences, L.P.
Affiliated beneficial owner667, L.P.
IssuerBeOne Medicines Ltd.

How ONC stock reacted

Close before

$346.50

Sep 15, 2026

First close after

+0.46%

$348.08

5 trading days

+6.23%

$368.08

Since filing

+11.76%

$387.25

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Frequently asked questions

What did ONC file with the SEC on Sep 16, 2026?

ONC filed a SCHEDULE 13D/A (SEC filing). Baker Brothers Life Sciences, L.P. and affiliated entities filed an amended Schedule 13D reporting beneficial ownership of 114,387,735 ordinary shares, or 7.7% of BeOne Medicines Ltd.'s outstanding class.

How do I read a SCHEDULE 13D/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 13D/A (schedule 13d/a): A report the company filed with the SEC (the US market regulator).

How did ONC stock react to this filing?

ONC closed at $346.50 before the filing and $348.08 on Sep 16, 2026 (+0.46%). Five trading days later: $368.08 (+6.23%).

Other ONC SEC filings

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