As of September 29, 2026, Simulations Plus's top three insider holders are Walter S Woltosz (Director, 3.20Mn shares), John Anthony Ii Dibella (Chief Revenue Officer, 85.14K shares), Jill Fiedler-Kelly (President, Services Solutions, 77.82K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Walter S Woltosz | Director, TenPercentOwner | 3,202,131 | 0 | 3,202,131 | 93.1% | 06 Jul, 2026 |
| 2 | John Anthony Ii Dibella | Chief Revenue Officer | 85,140 | 0 | 85,140 | 2.5% | 04 Aug, 2026 |
| 3 | Jill Fiedler-Kelly | President, Services Solutions | 77,817 | 0 | 77,817 | 2.3% | 17 Jun, 2026 |
| 4 | Sharlene Evans | Director | 17,173 | 0 | 17,173 | 0.5% | 01 May, 2026 |
| 5 | Daniel L Weiner | Director | 16,547 | 0 | 16,547 | 0.5% | 01 May, 2026 |
| 6 | John Kenneth Paglia | Director | 14,589 | 0 | 14,589 | 0.4% | 01 May, 2026 |
| 7 | David L. Ralph | Director | 12,797 | 0 | 12,797 | 0.4% | 03 Nov, 2021 |
| 8 | Lisa Lavange | Director | 9,968 | 0 | 9,968 | 0.3% | 02 Dec, 2025 |
| 9 | William W Frederick | Cfo | 2,100 | 0 | 2,100 | 0.1% | 27 Oct, 2023 |
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 |
|---|---|---|---|---|---|---|---|---|
| 03 Aug, 2026 | John Anthony Ii Dibella | Chief Revenue Officer | Disposed S | 1,000 | $18.28 | $18.28K | 85,140 | Direct |
| 06 Jul, 2026 | John Anthony Ii Dibella | Chief Revenue Officer | Disposed S | 1,000 | $18.36 | $18.36K | 86,140 | Direct |
| 01 Jul, 2026 | Walter S Woltosz | Director, TenPercentOwner | Disposed S | 4,177 | $18.44 | $77.02K | 3,202,131 | Direct |
| 16 Jun, 2026 | Jill Fiedler-Kelly | President, Services Solutions | Acquired M | 7,350 | $10.05 | $73.87K | 85,167 | Direct |
| 16 Jun, 2026 | Jill Fiedler-Kelly | President, Services Solutions | Disposed S | 7,350 | $18.20 | $133.77K | 77,817 | Direct |
| 16 Jun, 2026 | Jill Fiedler-Kelly | President, Services Solutions | Disposed M | 7,350 | $0.00 | $0 | 0 | Direct |
| 15 Jun, 2026 | Jill Fiedler-Kelly | President, Services Solutions | Acquired M | 1,050 | $10.05 | $10.55K | 78,867 | Direct |
| 15 Jun, 2026 | Jill Fiedler-Kelly | President, Services Solutions | Disposed S | 1,050 | $16.51 | $17.34K | 77,817 | Direct |
| 15 Jun, 2026 | Jill Fiedler-Kelly | President, Services Solutions | Disposed M | 1,050 | $0.00 | $0 | 7,350 | Direct |
| 03 Jun, 2026 | John Anthony Ii Dibella | Chief Revenue Officer | Disposed S | 1,000 | $16.50 | $16.50K | 87,140 | Direct |
| 01 Jun, 2026 | Walter S Woltosz | Director, TenPercentOwner | Disposed S | 15,000 | $17.43 | $261.45K | 3,252,800 | Direct |
| 11 May, 2026 | Jill Fiedler-Kelly | President, Services Solutions | Acquired M | 1,000 | $10.05 | $10.05K | 78,817 | Direct |
| 11 May, 2026 | Jill Fiedler-Kelly | President, Services Solutions | Disposed S | 1,000 | $16.53 | $16.53K | 77,817 | Direct |
| 11 May, 2026 | Jill Fiedler-Kelly | President, Services Solutions | Disposed M | 1,000 | $0.00 | $0 | 8,400 | Direct |
| 04 May, 2026 | John Anthony Ii Dibella | Chief Revenue Officer | Disposed S | 1,000 | $14.98 | $14.98K | 88,140 | Direct |
| 04 May, 2026 | Walter S Woltosz | Director, TenPercentOwner | Disposed S | 15,000 | $15.13 | $226.95K | 3,267,800 | Direct |
| 01 May, 2026 | Sharlene Evans | Director | Acquired A | 2,117 | $0.00 | $0 | 17,173 | Direct |
| 01 May, 2026 | John Kenneth Paglia | Director | Acquired A | 2,117 | $0.00 | $0 | 14,589 | Direct |
| 01 May, 2026 | Walter S Woltosz | Director, TenPercentOwner | Acquired A | 2,117 | $0.00 | $0 | 3,282,800 | Direct |
| 01 May, 2026 | Daniel L Weiner | Director | Acquired A | 2,117 | $0.00 | $0 | 16,547 | Direct |