Simulations Plus, Inc. (SLP) Insider Ownership

Historic Insider Ownership Trends

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).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
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.

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
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