As of September 29, 2026, SiteOne Landscape Supply's top three insider holders are Doug Black (Ceo, 482.16K shares), Doug Black (Ceo, 21.00K shares), Jack L Wyszomierski (Director, 19.12K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Doug Black | Ceo | 0 | 21,000 | 21,000 | 11.7% | 28 Aug, 2026 |
| 2 | Fred M Diaz | Director | 20,927 | 0 | 20,927 | 11.6% | 29 May, 2026 |
| 3 | William W Iii Douglas | Director | 19,120 | 0 | 19,120 | 10.6% | 14 May, 2026 |
| 4 | Jack L Wyszomierski | Director | 19,120 | 0 | 19,120 | 10.6% | 14 May, 2026 |
| 5 | Joseph Ketter | Evp, Human Resources | 14,636 | 0 | 14,636 | 8.1% | 12 Feb, 2026 |
| 6 | Scott Salmon | Evp, Strategy Development | 13,705 | 0 | 13,705 | 7.6% | 12 Feb, 2026 |
| 7 | John T Guthrie | Evp, Cfo And Assistant Sec. | 13,569 | 0 | 13,569 | 7.5% | 01 Dec, 2025 |
| 8 | Webster Roy Dunbar | Director | 11,671 | 0 | 11,671 | 6.5% | 14 May, 2026 |
| 9 | Jeri L Isbell | Director | 11,442 | 0 | 11,442 | 6.4% | 14 May, 2026 |
| 10 | L Briley Jr Brisendine | Evp, General Counsel Sec. | 11,175 | 0 | 11,175 | 6.2% | 13 Feb, 2025 |
| 11 | Larisa Drake | Director | 7,313 | 0 | 7,313 | 4.1% | 14 May, 2026 |
| 12 | Shannon Versaggi | Evp Mktg, Cat. Mgmt. Pricing | 7,143 | 0 | 7,143 | 4.0% | 12 Feb, 2026 |
| 13 | Judith S Sansone | Director | 3,176 | 0 | 3,176 | 1.8% | 14 May, 2026 |
| 14 | Eric J Elema | Evp, Cfo And Assistant Sec. | 2,911 | 0 | 2,911 | 1.6% | 17 Feb, 2026 |
| 15 | Daniel T. Laughlin | Svp, Strategy Development | 2,000 | 0 | 2,000 | 1.1% | 08 May, 2026 |
| 16 | Travis Ryan Jackson | General Counsel Secretary | 862 | 0 | 862 | 0.5% | 04 Jun, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 26 Aug, 2026 | Doug Black | Ceo | Acquired P | 5,000 | $96.13 | $480.65K | 13,000 | Indirect |
| 04 Aug, 2026 | Doug Black | Ceo | Acquired P | 4,000 | $101.94 | $407.76K | 4,000 | Indirect |
| 04 Aug, 2026 | Doug Black | Ceo | Acquired P | 4,000 | $102.13 | $408.52K | 8,000 | Indirect |
| 02 Jun, 2026 | Travis Ryan Jackson | General Counsel Secretary | Acquired M | 547 | — | — | 1,022 | Direct |
| 02 Jun, 2026 | Travis Ryan Jackson | General Counsel Secretary | Disposed F | 160 | $103.82 | $16.61K | 862 | Direct |
| 02 Jun, 2026 | Travis Ryan Jackson | General Counsel Secretary | Disposed M | 547 | $0.00 | $0 | 1,642 | Direct |
| 27 May, 2026 | Fred M Diaz | Director | Disposed S | 563 | $115.13 | $64.82K | 11,829 | Direct |
| 28 May, 2026 | Fred M Diaz | Director | Disposed S | 562 | $112.52 | $63.24K | 11,267 | Direct |
| 13 May, 2026 | William W Iii Douglas | Director | Acquired A | 1,186 | $0.00 | $0 | 19,120 | Direct |
| 12 May, 2026 | Fred M Diaz | Director | Acquired M | 1,125 | — | — | 12,392 | Direct |
| 12 May, 2026 | Larisa Drake | Director | Acquired M | 1,125 | — | — | 7,313 | Direct |
| 13 May, 2026 | Judith S Sansone | Director | Acquired A | 1,186 | $0.00 | $0 | 3,176 | Direct |
| 13 May, 2026 | Jack L Wyszomierski | Director | Acquired A | 1,186 | $0.00 | $0 | 19,120 | Direct |
| 13 May, 2026 | Webster Roy Dunbar | Director | Acquired A | 1,186 | $0.00 | $0 | 11,671 | Direct |
| 12 May, 2026 | Jeri L Isbell | Director | Acquired M | 1,125 | — | — | 11,442 | Direct |
| 12 May, 2026 | Fred M Diaz | Director | Disposed M | 1,125 | $0.00 | $0 | 0 | Direct |
| 12 May, 2026 | Larisa Drake | Director | Disposed M | 1,125 | $0.00 | $0 | 0 | Direct |
| 12 May, 2026 | Jeri L Isbell | Director | Disposed M | 1,125 | $0.00 | $0 | 0 | Direct |
| 13 May, 2026 | Fred M Diaz | Director | Acquired A | 1,186 | $0.00 | $0 | 1,186 | Direct |
| 13 May, 2026 | Larisa Drake | Director | Acquired A | 1,186 | $0.00 | $0 | 1,186 | Direct |