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Zachary Hornby

President & CEO, director at Boundless Bio.

ExecutiveDirectorPublic company
Updated Nov 9, 2026·Latest SEC filing Jan 26, 2026·Suggest an edit

About Zachary Hornby

Zachary Hornby is a president & CEO, director at Boundless Bio.

Zachary Hornby reports to the SEC as a director or officer of 2 public companies, including Ignyta (RXDX).

Zachary Hornby first appears on SEC filings in 2014.

Experience

This experience comes from SEC filings. The years are when the filings name Zachary Hornby in the role, so the role may have started earlier or lasted longer.

Boundless Bio, Inc.
President & CEO, director
2020 – 2026 · Public company (BOLD)
Ignyta, Inc.
Chief Operating Officer
2014 – 2018 · Public company (RXDX)

Key Colleagues at Startups

The people Zachary Hornby works with at each company, as listed on that company's latest Form D.

Sources

  1. SECBoundless Bio, Inc. Form D, filed Aug 15, 2023
  2. SECForms 3, 4 and 5 filed by Zachary Hornby (SEC filer 1602227)