Simulations Plus, Inc. (SLP) Insider Ownership

Historic Insider Ownership Trends

As of March 23, 2026, the three largest insider holders of SLP are Walter S Woltosz (Director, 3.28Mn shares), John Anthony Ii Dibella (Chief Revenue Officer, 90.14K shares), Jill Fiedler-Kelly (President, Services Solutions, 77.82K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Walter S Woltosz 3,280,683 0 02 Feb, 2026
John Anthony Ii Dibella Chief Revenue Officer 90,140 0 09 Feb, 2026
Jill Fiedler-Kelly President, Services Solutions 77,817 0 29 Jan, 2026
Sharlene Evans 15,056 0 02 Feb, 2026
Daniel L Weiner 14,430 0 02 Feb, 2026
David L. Ralph 12,797 0 03 Nov, 2021
John Kenneth Paglia 12,472 0 02 Feb, 2026
Lisa Lavange 9,968 0 02 Dec, 2025
William W Frederick Cfo 2,100 0 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.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
06 Feb, 2026 John Anthony Ii Dibella Common Stock A 10,300 $9.71 90,140 D M
06 Feb, 2026 John Anthony Ii Dibella Stock Options (Right to Buy) D 10,300 $0.00 0 D M
30 Jan, 2026 Sharlene Evans Common Stock A 1,776 $0.00 15,056 D A
30 Jan, 2026 Walter S Woltosz Common Stock A 1,776 $0.00 3,280,683 D A
30 Jan, 2026 Daniel L Weiner Common Stock A 1,776 $0.00 14,430 D A
30 Jan, 2026 John Kenneth Paglia Common Stock A 1,776 $0.00 12,472 D A
28 Jan, 2026 Jill Fiedler-Kelly Common Stock A 8,950 $9.71 77,817 D M
28 Jan, 2026 Jill Fiedler-Kelly Employee Stock Option (Right to Buy) D 8,950 $0.00 0 D M
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 Lisa Lavange Common Stock A 1,771 $0.00 10,834 D A
03 Nov, 2025 John Kenneth Paglia Common Stock A 1,771 $0.00 10,696 D A
03 Nov, 2025 Walter S Woltosz Common Stock A 1,771 $0.00 3,288,002 D A
03 Nov, 2025 Sharlene Evans Common Stock A 1,771 $0.00 13,280 D A
16 Oct, 2025 Shawn Oconnor Stock Options (Right to Buy) A 50,000 $0.00 50,000 D A
16 Oct, 2025 William W Frederick Stock Options (Right to Buy) A 32,500 $0.00 32,500 D A
16 Oct, 2025 John Anthony Ii Dibella Stock Options (Right to Buy) A 27,500 $0.00 27,500 D A
16 Oct, 2025 Jill Fiedler-Kelly Stock Options (Right to Buy) A 27,500 $0.00 27,500 D A
01 Oct, 2025 Walter S Woltosz Common Stock D 20,000 $15.39 3,286,231 D S