MKSI SCHEDULE 13G/A: SEC filing
An institutional filer
Filed with the SEC on · accession 0000019617-26-000334
MKSI filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Sep 3, 2026. An institutional filer submitted an amended Schedule 13G/A disclosing its beneficial ownership position in MKS Inc. (MKSI). The stock moved -0.7% by the first close after the filing.
Summary of the filing
An institutional filer submitted an amended Schedule 13G/A disclosing its beneficial ownership position in MKS Inc. (MKSI). The filing indicates a passive investment stake with no reported intent to influence control of the company.
Key details
How MKSI stock reacted
Close before
$251.38
Sep 2, 2026
First close after
-0.69%
$249.65
5 trading days
+4.16%
$261.84
Since filing
-23.51%
$192.27
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Click hereFrequently asked questions
What did MKSI file with the SEC on Sep 3, 2026?
MKSI filed a SCHEDULE 13G/A (SEC filing). An institutional filer submitted an amended Schedule 13G/A disclosing its beneficial ownership position in MKS Inc. (MKSI). The filing indicates a passive investment stake with no reported 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 MKSI stock react to this filing?
MKSI closed at $251.38 before the filing and $249.65 on Sep 3, 2026 (-0.69%). Five trading days later: $261.84 (+4.16%).
Other MKSI SEC filings
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