Summary
Updated Aug 30, 2026
J. Duncan Smith is Vice President/Secretary, Director, 10% Owner of Sinclair, Inc. (SBGI). 3 SEC Form 4 filings on record going back to 2025, most recently on 13 March 2026.
Trading Pattern
InsiderAlpha's records for J. Duncan Smith go back to 2025: 3 primary Form 4 filings, an average of 1.5 per year. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies J. Duncan Smith files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- David D. Smith - $1.50M of SBGI open-market activity in the last 12 months
- Daniel C. Keith - $806K of SBGI open-market activity in the last 12 months
- Benson E. Legg - $460K of SBGI open-market activity in the last 12 months
- Robert Weisbord - $417K of SBGI open-market activity in the last 12 months
- David B. Gibber - $402K of SBGI open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is J. Duncan Smith?
J. Duncan Smith is a corporate insider, tracked as Vice President/Secretary, Director, 10% Owner of Sinclair, Inc. (SBGI). InsiderAlpha holds 3 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did J. Duncan Smith last file a Form 4?
The most recent primary Form 4 on record is dated 13 March 2026, one of 3 filings going back to 2025.
Where can I see all of J. Duncan Smith's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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