Based on data from the past 90 days ending January 14, 2026, Simulations Plus's three largest insider shareholders are Director Walter S Woltosz (3.28Mn shares), Business Unit President John Anthony Ii Dibella (79.84K shares), Business Unit President Jill Fiedler-Kelly (68.87K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Walter S Woltosz | 3,278,907 | 22 Dec, 2025 | |
| John Anthony Ii Dibella | Business Unit President | 79,840 | 26 Dec, 2023 |
| Jill Fiedler-Kelly | Business Unit President | 68,867 | 10 Sep, 2024 |
| Sharlene Evans | 13,280 | 04 Nov, 2025 | |
| David L. Ralph | 12,797 | 03 Nov, 2021 | |
| Daniel L Weiner | 12,654 | 04 Nov, 2025 | |
| John Kenneth Paglia | 10,696 | 04 Nov, 2025 | |
| Lisa Lavange | 9,968 | 02 Dec, 2025 | |
| William W Frederick | Cfo | 2,100 | 27 Oct, 2023 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 18 Dec, 2025 | Walter S Woltosz | Common Stock | D | 9,095 | $0.00 | 3,278,907 | D | G |
| 01 Dec, 2025 | Lisa Lavange | Common Stock | D | 866 | $16.91 | 9,968 | D | S |
| 03 Nov, 2025 | Daniel L Weiner | Common Stock | A | 1,771 | $0.00 | 12,654 | D | A |
| 03 Nov, 2025 | Walter S Woltosz | Common Stock | A | 1,771 | $0.00 | 3,288,002 | D | A |
| 03 Nov, 2025 | John Kenneth Paglia | Common Stock | A | 1,771 | $0.00 | 10,696 | D | A |
| 03 Nov, 2025 | Lisa Lavange | Common Stock | A | 1,771 | $0.00 | 10,834 | D | A |
| 03 Nov, 2025 | Sharlene Evans | Common Stock | A | 1,771 | $0.00 | 13,280 | D | A |
| 01 Oct, 2025 | Walter S Woltosz | Common Stock | D | 20,000 | $15.39 | 3,286,231 | D | S |
| 02 Sep, 2025 | Lisa Lavange | Common Stock | D | 867 | $14.10 | 9,063 | D | S |
| 01 Aug, 2025 | Daniel L Weiner | Common Stock | A | 2,074 | $0.00 | 10,883 | D | A |
| 01 Aug, 2025 | Walter S Woltosz | Common Stock | A | 2,074 | $0.00 | 3,306,231 | D | A |
| 01 Aug, 2025 | John Kenneth Paglia | Common Stock | A | 2,074 | $0.00 | 8,925 | D | A |
| 01 Aug, 2025 | Lisa Lavange | Common Stock | A | 2,074 | $0.00 | 10,797 | D | A |
| 01 Aug, 2025 | Lisa Lavange | Common Stock | D | 867 | $12.93 | 9,930 | D | S |
| 01 Aug, 2025 | Sharlene Evans | Common Stock | A | 2,074 | $0.00 | 11,509 | D | A |
| 01 Jul, 2025 | Walter S Woltosz | Common Stock | D | 7,776 | $17.94 | 3,316,381 | D | S |
| 01 Jul, 2025 | Walter S Woltosz | Common Stock | D | 12,224 | $18.58 | 3,304,157 | D | S |
| 02 Jun, 2025 | Walter S Woltosz | Common Stock | D | 100 | $31.36 | 3,324,157 | D | S |
| 02 Jun, 2025 | Walter S Woltosz | Common Stock | D | 700 | $29.13 | 3,325,257 | D | S |
| 02 Jun, 2025 | Walter S Woltosz | Common Stock | D | 2,700 | $27.71 | 3,325,957 | D | S |