SEC Form 4 · Updated Daily
SLP
— SIMULATIONS PLUS, INC. OwnershipInsider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| CREELEY RONALD F | Officer | 704,595 | 2009-04-07 | A |
| BERAN MOMOKO A | Reporting Owner | 368,381 | 2012-02-16 | G |
| DAHLEN JEFFREY A | Officer | 195,000 | 2008-02-27 | A |
| Grasela Thaddeus Henry Jr | Director · Officer | 79,763 | 2018-03-09 | S |
| WEISS RICHARD R | Director | 34,812 | 2012-02-15 | M |
| D ARGENIO DAVID Z | Reporting Owner | 33,608 | 2017-05-24 | S |
| Ralph David L. | Director | 12,797 | 2021-11-01 | A |
| LaVange Lisa | Director | 9,968 | 2025-12-01 | S |
| KNEISEL JOHN ROBERT | Reporting Owner | 3,400 | 2020-04-17 | S |
| Rosenberger Harold Wayne | Director | 3,000 | 2013-09-03 | M |
| FREDERICK WILLIAM W | Officer | 0 | 2026-10-06 | D |
| Evans Sharlene | Director | 0 | 2026-10-06 | D |
| WOLTOSZ WALTER S | 10%+ Owner · Director | 0 | 2026-10-06 | D |
| WEINER DANIEL L | Director | 0 | 2026-10-06 | D |
| Fiedler-Kelly Jill | Officer | 0 | 2026-10-06 | D |
| WOLTOSZ VIRGINIA E | 10%+ Owner | 0 | 2026-10-06 | D |
| OCONNOR SHAWN | Officer | 0 | 2020-11-30 | S |
| DiBella John Anthony II | Officer | 0 | 2026-10-06 | D |
| Paglia John Kenneth | Director | 0 | 2026-10-06 | D |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-10-06 | OCONNOR SHAWN | Disposition to issuer (derivative) | 50,000 | — | 0 |
| 2026-10-06 | WOLTOSZ VIRGINIA E | Disposition to issuer (derivative) | 5,000 | — | 0 |
| 2026-10-06 | WOLTOSZ VIRGINIA E | Disposition to issuer | 3,202,131 | $18.50 | 0 |
| 2026-10-06 | WOLTOSZ WALTER S | Disposition to issuer (derivative) | 5,000 | — | 0 |
| 2026-10-06 | WOLTOSZ WALTER S | Disposition to issuer | 3,202,131 | $18.50 | 0 |
| 2026-10-06 | WEINER DANIEL L | Disposition to issuer (derivative) | 2,000 | — | 0 |
| 2026-10-06 | WEINER DANIEL L | Disposition to issuer | 16,547 | $18.50 | 0 |
| 2026-10-06 | Paglia John Kenneth | Disposition to issuer (derivative) | 6,000 | — | 0 |
| 2026-10-06 | Paglia John Kenneth | Disposition to issuer | 14,589 | $18.50 | 0 |
| 2026-10-06 | FREDERICK WILLIAM W | Disposition to issuer (derivative) | 32,500 | — | 0 |
| 2026-10-06 | FREDERICK WILLIAM W | Disposition to issuer | 2,100 | $18.50 | 0 |
| 2026-10-06 | Fiedler-Kelly Jill | Disposition to issuer (derivative) | 27,500 | — | 0 |
| 2026-10-06 | Fiedler-Kelly Jill | Disposition to issuer | 77,817 | $18.50 | 0 |
| 2026-10-06 | Evans Sharlene | Disposition to issuer | 17,173 | $18.50 | 0 |
| 2026-10-06 | DiBella John Anthony II | Disposition to issuer (derivative) | 27,500 | — | 0 |
| 2026-10-06 | DiBella John Anthony II | Disposition to issuer | 85,140 | $18.50 | 0 |
| 2026-08-03 | DiBella John Anthony II | Open-market sale | 1,000 | $18.28 | 85,140 |
| 2026-07-06 | DiBella John Anthony II | Open-market sale | 1,000 | $18.36 | 86,140 |
| 2026-07-01 | WOLTOSZ VIRGINIA E | Open-market sale | 4,177 | $18.44 | 3,202,131 |
| 2026-07-01 | WOLTOSZ WALTER S | Open-market sale | 4,177 | $18.44 | 3,202,131 |
| 2026-06-16 | Fiedler-Kelly Jill | Option exercise (derivative) | 7,350 | $0.00 | 0 |
| 2026-06-16 | Fiedler-Kelly Jill | Open-market sale | 7,350 | $18.20 | 77,817 |
| 2026-06-16 | Fiedler-Kelly Jill | Option exercise | 7,350 | $10.05 | 85,167 |
| 2026-06-15 | Fiedler-Kelly Jill | Option exercise (derivative) | 1,050 | $0.00 | 7,350 |
| 2026-06-15 | Fiedler-Kelly Jill | Open-market sale | 1,050 | $16.51 | 77,817 |
| 2026-06-15 | Fiedler-Kelly Jill | Option exercise | 1,050 | $10.05 | 78,867 |
| 2026-06-03 | DiBella John Anthony II | Open-market sale | 1,000 | $16.50 | 87,140 |
| 2026-06-01 | WOLTOSZ VIRGINIA E | Open-market sale | 15,000 | $17.43 | 3,252,800 |
| 2026-06-01 | WOLTOSZ WALTER S | Open-market sale | 15,000 | $17.43 | 3,252,800 |
| 2026-05-11 | Fiedler-Kelly Jill | Option exercise (derivative) | 1,000 | $0.00 | 8,400 |
| 2026-05-11 | Fiedler-Kelly Jill | Open-market sale | 1,000 | $16.53 | 77,817 |
| 2026-05-11 | Fiedler-Kelly Jill | Option exercise | 1,000 | $10.05 | 78,817 |
| 2026-05-04 | WOLTOSZ VIRGINIA E | Open-market sale | 15,000 | $15.13 | 3,267,800 |
| 2026-05-04 | WOLTOSZ WALTER S | Open-market sale | 15,000 | $15.13 | 3,267,800 |
| 2026-05-04 | DiBella John Anthony II | Open-market sale | 1,000 | $14.98 | 88,140 |
| 2026-05-01 | Paglia John Kenneth | Grant / award | 2,117 | $0.00 | 14,589 |
| 2026-05-01 | WEINER DANIEL L | Grant / award | 2,117 | $0.00 | 16,547 |
| 2026-05-01 | WOLTOSZ WALTER S | Grant / award | 2,117 | $0.00 | 3,282,800 |
| 2026-05-01 | Evans Sharlene | Grant / award | 2,117 | $0.00 | 17,173 |
| 2026-04-15 | DiBella John Anthony II | Open-market sale | 1,000 | $13.37 | 89,140 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.