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SIBN SCHEDULE 13G/A: SEC filing

Brown Advisory Inc.

Filed with the SEC on · accession 0001345929-26-000043

SIBN filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Nov 13, 2026. Brown Advisory Inc. filed an amended Schedule 13G reporting beneficial ownership of 2,025,770 shares, or 4.52%, of SI-BONE, Inc. common stock as of September 30, 2026. The stock moved -2.9% by the first close after the filing.

Summary of the filing

Brown Advisory Inc. filed an amended Schedule 13G reporting beneficial ownership of 2,025,770 shares, or 4.52%, of SI-BONE, Inc. common stock as of September 30, 2026. The filing is a passive investment disclosure made on behalf of Brown Advisory and its subsidiaries.

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Key details

Total shares beneficially owned$2.0M
Percent of class beneficially ownedPCT 5
Filer / parent holding company reporting beneficial ownershipBrown Advisory Inc.
Subsidiary of filer, beneficial owner of 6,242 sharesBrown Investment Advisory & Trust Co
Subsidiary of filer, beneficial owner of 2,015,623 sharesBrown Advisory LLC
Subsidiary of filer, beneficial owner of 1,216 sharesSignature Financial Management, Inc.
Subsidiary of filer, beneficial owner of 2,689 sharesBrown Advisory Ltd
Issuer of the securitiesSI-BONE, Inc.
Chief compliance officer, brown advisory inc.Victor Fernandez

How SIBN stock reacted

Close before

$24.14

Nov 12, 2026

First close after

-2.90%

$23.44

5 trading days

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Since filing

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Frequently asked questions

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

SIBN filed a SCHEDULE 13G/A (SEC filing). Brown Advisory Inc. filed an amended Schedule 13G reporting beneficial ownership of 2,025,770 shares, or 4.52%, of SI-BONE, Inc. common stock as of September 30, 2026. The filing is a passive investment disclosure made on behalf of Brown Advisory and its subsidiaries.

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 SIBN stock react to this filing?

SIBN closed at $24.14 before the filing and $23.44 on Nov 13, 2026 (-2.90%).

Other SIBN SEC filings

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