Summary
Updated Aug 31, 2026
Doug Black is CEO, Director of SiteOne Landscape Supply, Inc. (SITE). 15 SEC Form 4 filings on record going back to 2024, most recently on 28 August 2026. Most recent open-market trade: bought $481K of SITE on 28 August 2026. Lifetime open-market purchases: $1.30M. Lifetime open-market sales: $4.82M.
Recent Transactions
20Every recent SEC Form 4 transaction Doug Black has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Doug Black go back to 2024: 15 primary Form 4 filings, an average of 5.0 per year. The typical open-market purchase is $432K (3 buys totaling $1.30M). The largest single buy on record is $481K of SITE in 2026. Sales side: 2 recorded sales totaling $4.82M, so the filing history runs sell-heavy by dollar value. 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 Doug Black 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.
- Eric J. Elema - $279K of SITE open-market activity in the last 12 months
- John T. Guthrie - $258K of SITE open-market activity in the last 12 months
- Daniel T. Laughlin - $247K of SITE open-market activity in the last 12 months
- Fred M. Diaz - $128K of SITE 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 Doug Black?
Doug Black is a corporate insider, tracked as CEO, Director of SiteOne Landscape Supply, Inc. (SITE). InsiderAlpha holds 15 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Doug Black submitted recently?
2 primary Form 4 filings in the last 90 days, covering 1 company.
Has Doug Black been buying or selling stock?
Recorded transactions: 3 open-market purchases ($1.30M) and 2 open-market sales ($4.82M) across all tracked filings.
Where can I see all of Doug Black'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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