SLP · Insider Trading
Simulations Plus, Inc.
Every open-market purchase and sale reported by SLP officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-10-06 | Sharlene Evans | Director | D | −17,173 | −$317.70K |
| 2026-10-06 | John Kenneth Paglia | Director | D | −14,589 | −$269.90K |
| 2026-10-06 | Jill Fiedler-Kelly | President, Services Solutions | D | −77,817 | −$1.44M |
| 2026-10-06 | William W Frederick | EVP/CFO | D | −2,100 | −$38.85K |
| 2026-10-06 | John Anthony DiBella II | Chief Revenue Officer | D | −85,140 | −$1.58M |
| 2026-10-06 | Daniel L Weiner | Director | D | −16,547 | −$306.12K |
| 2026-10-06 | Virginia E Woltosz | 10%+ Owner | D | −6,404,262 | −$118.48M |
| 2026-10-06 | Shawn Oconnor | Chief Executive Officer | D | −247,500 deriv. | — |
| 2026-08-04 | John Anthony DiBella II | Chief Revenue Officer | Sell | −1,000 | −$18.28K |
| 2026-07-08 | John Anthony DiBella II | Chief Revenue Officer | Sell | −1,000 | −$18.36K |
| 2026-07-06 | Walter S Woltosz | Director | Sell | −8,354 | −$154.05K |
| 2026-06-17 | Jill Fiedler-Kelly | President, Services Solutions | MIXED | — | −$59.90K |
| 2026-06-16 | Jill Fiedler-Kelly | President, Services Solutions | MIXED | — | −$6.78K |
| 2026-06-04 | John Anthony DiBella II | Chief Revenue Officer | Sell | −1,000 | −$16.50K |
| 2026-06-02 | Walter S Woltosz | Director | Sell | −30,000 | −$522.90K |
| 2026-05-13 | Jill Fiedler-Kelly | President, Services Solutions | MIXED | — | −$6.48K |
| 2026-05-05 | Walter S Woltosz | Director | Sell | −30,000 | −$453.90K |
| 2026-05-05 | John Anthony DiBella II | Chief Revenue Officer | Sell | −1,000 | −$14.98K |
| 2026-05-01 | Daniel L Weiner | Director | A | +2,117 | — |
| 2026-05-01 | John Kenneth Paglia | Director | A | +2,117 | — |
| 2026-05-01 | Sharlene Evans | Director | A | +2,117 | — |
| 2026-05-01 | Walter S Woltosz | Director | A | +2,117 | — |
| 2026-04-16 | John Anthony DiBella II | Chief Revenue Officer | Sell | −1,000 | −$13.37K |
| 2026-02-09 | John Anthony DiBella II | Chief Revenue Officer | M | +10,300 | +$100.01K |
| 2026-02-02 | Sharlene Evans | Director | A | +1,776 | — |
| 2026-02-02 | Walter S Woltosz | Director | A | +3,552 | — |
| 2026-02-02 | John Kenneth Paglia | Director | A | +1,776 | — |
| 2026-02-02 | Daniel L Weiner | Director | A | +1,776 | — |
| 2026-01-29 | Jill Fiedler-Kelly | President, Services Solutions | M | +8,950 | +$86.90K |
| 2025-12-22 | Walter S Woltosz | Director | G | −9,095 | — |
| 2025-12-02 | Lisa LaVange | Director | Sell | −866 | −$14.64K |
| 2025-11-04 | Sharlene Evans | Director | A | +1,771 | — |
| 2025-11-04 | John Kenneth Paglia | Director | A | +1,771 | — |
| 2025-11-04 | Lisa LaVange | Director | A | +1,771 | — |
| 2025-11-04 | Daniel L Weiner | Director | A | +1,771 | — |
| 2025-11-04 | Walter S Woltosz | Director | A | +3,542 | — |
| 2025-10-17 | William W Frederick | EVP/CFO | A | +32,500 deriv. | — |
| 2025-10-17 | Shawn Oconnor | Chief Executive Officer | A | +50,000 deriv. | — |
| 2025-10-17 | Jill Fiedler-Kelly | President, Services Solutions | A | +27,500 deriv. | — |
| 2025-10-17 | John Anthony DiBella II | Chief Revenue Officer | A | +27,500 deriv. | — |
| 2025-10-03 | Walter S Woltosz | Director | Sell | −40,000 | −$615.60K |
| 2025-09-04 | Lisa LaVange | Director | Sell | −867 | −$12.22K |
| 2025-08-04 | Daniel L Weiner | Director | A | +2,074 | — |
| 2025-08-04 | Lisa LaVange | Director | MIXED | +1,207 | −$11.21K |
| 2025-08-04 | Walter S Woltosz | Director | A | +4,148 | — |
| 2025-08-04 | John Kenneth Paglia | Director | A | +2,074 | — |
| 2025-08-04 | Sharlene Evans | Director | A | +2,074 | — |
| 2025-07-02 | Walter S Woltosz | Director | Sell | −40,000 | −$733.25K |
| 2025-06-03 | Walter S Woltosz | Director | Sell | −40,000 | −$1.09M |
| 2025-05-01 | John Kenneth Paglia | Director | A | +786 | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Walter S Woltosz | Director | 3,202,131 | $59.24M |
| Lisa LaVange | Director | 9,968 | $184.41K |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the SLP quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.