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GTM SCHEDULE 13G/A: SEC filing

Henry Schuck, DO Holdings (WA), LLC, and Kirk Norman Brown

Filed with the SEC on · accession 0001193125-26-458311

GTM filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Nov 12, 2026. Henry Schuck, DO Holdings (WA), LLC, and Kirk Norman Brown filed an amended Schedule 13G reporting their beneficial ownership of ZoomInfo Technologies Inc. common stock as of September 30, 2026. The stock moved -1.5% by the first close after the filing.

Summary of the filing

Henry Schuck, DO Holdings (WA), LLC, and Kirk Norman Brown filed an amended Schedule 13G reporting their beneficial ownership of ZoomInfo Technologies Inc. common stock as of September 30, 2026. Schuck beneficially owns 27,451,689 shares (9.4%), DO Holdings 13,377,329 shares (4.6%), and Brown 20,993,243 shares (7.2%).

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Key details

Shares beneficially owned by Henry Schuck$27.5M
Shares beneficially owned by DO Holdings (WA), LLC$13.4M
Shares beneficially owned by Kirk Norman Brown$21.0M
IssuerZoomInfo Technologies Inc.
Reporting person / 10% ownerDO Holdings (WA), LLC
ShareholderHSKB Funds, LLC
ShareholderHSKB Funds II, LLC
Manager of hskb fundsHLS Management, LLC
Reporting person / ceoHenry Schuck
Reporting personKirk Norman Brown

How GTM stock reacted

Close before

$3.35

Nov 11, 2026

First close after

-1.49%

$3.30

5 trading days

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Since filing

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Frequently asked questions

What did GTM file with the SEC on Nov 12, 2026?

GTM filed a SCHEDULE 13G/A (SEC filing). Henry Schuck, DO Holdings (WA), LLC, and Kirk Norman Brown filed an amended Schedule 13G reporting their beneficial ownership of ZoomInfo Technologies Inc. common stock as of September 30, 2026. Schuck beneficially owns 27,451,689 shares (9.4%), DO Holdings 13,377,329 shares (4.6%), and Brown 20,993,243 shares (7.2%).

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 GTM stock react to this filing?

GTM closed at $3.35 before the filing and $3.30 on Nov 12, 2026 (-1.49%).

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