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Simulations Plus, Inc.

SLP
Exchange
Nasdaq
Industry
Services-Computer Integrated Systems Design
SEC CIK
0001023459

In the last 90 days, Simulations Plus, Inc. insiders filed 0 open-market purchases and 3 sales; 169 institutions reported holding it in 13F filings for Q2 2026, worth $309.1M in total; no superinvestor holds it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Simulations Plus, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
0 filings
Open-market sells
3 filings
2 insiders, $113.7K in total
Insiders trading
2
Net value
−$113.7K
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Simulations Plus, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Simulations Plus, Inc.
NameTitleLast reported holdingLast filingFilings, past year
DiBella John Anthony IIChief Revenue Officer85,140Aug 4, 20267
Woltosz Walter SDirector, 10% Owner3,202,131Jul 6, 20268
Woltosz Virginia E10% Owner3,202,131Jul 6, 20266
Fiedler-Kelly JillPresident, Services Solutions77,817Jun 17, 20265
Weiner Daniel LDirector16,547May 1, 20263
Paglia John KennethDirector14,589May 1, 20263
Evans SharleneDirector17,173May 1, 20263
LaVange LisaDirector9,968Dec 2, 20252
Oconnor ShawnChief Executive Officer–Oct 17, 20251
Frederick William WEVP/CFO2,100Oct 17, 20251
Szot DanielChief Revenue Officer–Oct 21, 20240
Chang StevenPresident, Immunetrics–Oct 24, 20230
Howell BrettBusiness Unit President–Oct 23, 20230
Ralph David L.Director12,797Nov 30, 20210

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Aug 4, 2026 (view filing)4:07 PM ETAug 31 dayDiBella John Anthony IIChief Revenue OfficerSSale−1.00K$18.28−$18.3K−1.2%85.1K after10b5-1
Jul 8, 2026 (view filing)4:05 PM ETJul 62 daysDiBella John Anthony IIChief Revenue OfficerSSale−1.00K$18.36−$18.4K−1.1%86.1K after10b5-1
Jul 6, 2026 (view filing)6:50 PM ETJul 15 daysWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−4.18K$18.44−$77.0K−0.1%3.20M after10b5-1
Jun 17, 2026 (view filing)Jun 161 dayFiedler-Kelly JillPresident, Services SolutionsSSale−7.35K$18.20−$133.8K−8.6%77.8K after10b5-1
Jun 16, 2026 (view filing)Jun 151 dayFiedler-Kelly JillPresident, Services SolutionsSSale−1.05K$16.51−$17.3K−1.3%77.8K after10b5-1
Jun 4, 2026 (view filing)Jun 31 dayDiBella John Anthony IIChief Revenue OfficerSSale−1.00K$16.50−$16.5K−1.1%87.1K after10b5-1
Jun 2, 2026 (view filing)4:06 PM ETJun 11 dayWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−15.0K$17.43−$261.4K−0.5%3.25M after10b5-1
May 13, 2026 (view filing)May 112 daysFiedler-Kelly JillPresident, Services SolutionsSSale−1.00K$16.53−$16.5K−1.3%77.8K after10b5-1
May 5, 2026 (view filing)4:10 PM ETMay 41 dayWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−15.0K$15.13−$226.9K−0.5%3.27M after10b5-1
May 5, 2026 (view filing)May 41 dayDiBella John Anthony IIChief Revenue OfficerSSale−1.00K$14.98−$15.0K−1.1%88.1K after10b5-1
Apr 16, 2026 (view filing)Apr 151 dayDiBella John Anthony IIChief Revenue OfficerSSale−1.00K$13.37−$13.4K−1.1%89.1K after10b5-1
Dec 2, 2025 (view filing)Dec 11 dayLaVange LisaDirectorSSale−866$16.91−$14.6K−8.0%9.97K after10b5-1
Oct 3, 2025 (view filing)4:13 PM ETOct 12 daysWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$15.39−$307.8K−0.6%3.29M after10b5-1
Sep 4, 2025 (view filing)Sep 22 daysLaVange LisaDirectorSSale−867$14.10−$12.2K−8.7%9.06K after10b5-1
Aug 4, 2025 (view filing)Aug 13 daysLaVange LisaDirectorSSale−867$12.93−$11.2K−8.0%9.93K after10b5-1
Jul 2, 2025 (view filing)4:24 PM ETJul 11 dayWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$18.33−$366.6K−0.6%3.30M after2 lots10b5-1
Jun 3, 2025 (view filing)4:57 PM ETJun 21 dayWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$27.15−$543.1K−0.6%3.32M after5 lots10b5-1
May 1, 2025 (view filing)5:53 PM ETMay 1Same dayWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$33.51−$670.2K−0.6%3.34M after2 lots10b5-1
Apr 2, 2025 (view filing)4:20 PM ETApr 11 dayWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$24.09−$481.8K−0.6%3.36M after2 lots10b5-1
Mar 4, 2025 (view filing)5:08 PM ETMar 31 dayWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$28.68−$573.6K−0.6%3.38M after10b5-1
Feb 4, 2025 (view filing)5:33 PM ETFeb 31 dayWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$33.91−$678.2K−0.6%3.40M after2 lots10b5-1
Jan 3, 2025 (view filing)4:36 PM ETJan 21 dayWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$27.88−$557.7K−0.6%3.42M after2 lots10b5-1
Dec 30, 2024 (view filing)Dec 273 daysWeiner Daniel LDirectorSSale−750$28.50−$21.4K−9.4%7.24K after10b5-1
Dec 3, 2024 (view filing)5:35 PM ETDec 21 dayWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$31.76−$635.2K−0.6%3.44M after10b5-1
Dec 3, 2024 (view filing)Dec 21 dayLaVange LisaDirectorSSale−650$31.88−$20.7K−8.3%7.15K after10b5-1
Nov 5, 2024 (view filing)8:02 AM ETNov 14 daysWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$27.66−$553.2K−0.6%3.46M after10b5-1
Oct 2, 2024 (view filing)4:34 PM ETOct 11 dayWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$31.26−$625.2K−0.6%3.48M after10b5-1
Oct 1, 2024 (view filing)Sep 274 daysWeiner Daniel LDirectorSSale−750$31.54−$23.7K−9.7%6.99K after10b5-1
Sep 4, 2024 (view filing)4:11 PM ETSep 31 dayWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$35.18−$703.7K−0.6%3.50M after2 lots10b5-1
Sep 4, 2024 (view filing)Sep 31 dayLaVange LisaDirectorSSale−650$35.95−$23.4K−8.7%6.81K after10b5-1
Aug 2, 2024 (view filing)4:19 PM ETAug 11 dayWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$39.63−$792.5K−0.6%3.52M after2 lots10b5-1
Jul 2, 2024 (view filing)4:10 PM ETJul 11 dayWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$46.71−$934.2K−0.6%3.54M after3 lots10b5-1
Jul 1, 2024 (view filing)Jun 283 daysWeiner Daniel LDirectorSSale−750$49.32−$37.0K−9.7%7.01K after10b5-1
Jun 4, 2024 (view filing)5:04 PM ETJun 31 dayWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$46.25−$925.0K−0.6%3.56M after2 lots10b5-1
Jun 4, 2024 (view filing)Jun 31 dayLaVange LisaDirectorSSale−650$48.26−$31.4K−8.8%6.72K after10b5-1
May 15, 2024 (view filing)May 141 dayLaVange LisaDirectorSSale−500$50.00−$25.0K−6.4%7.37K after10b5-1
May 15, 2024 (view filing)May 141 dayWeiner Daniel LDirectorSSale−3.00K$50.13−$150.4K−27.9%7.76K after10b5-1
May 8, 2024 (view filing)May 71 dayWeiner Daniel LDirectorSSale−3.25K$48.31−$157.0K−27.1%8.76K after10b5-1
May 8, 2024 (view filing)May 71 dayLaVange LisaDirectorSSale−650$48.30−$31.4K−7.6%7.87K after10b5-1
May 2, 2024 (view filing)4:37 PM ETMay 11 dayWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$45.95−$919.0K−0.6%3.58M after2 lots10b5-1
Apr 2, 2024 (view filing)4:32 PM ETApr 11 dayWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$39.94−$798.9K−0.6%3.60M after2 lots10b5-1
Mar 5, 2024 (view filing)4:22 PM ETMar 14 daysWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$41.41−$828.2K−0.5%3.62M after2 lots10b5-1
Feb 5, 2024 (view filing)5:04 PM ETFeb 1-24 daysWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$38.00−$759.9K−0.5%3.64M after3 lots10b5-1
Jan 4, 2024 (view filing)6:36 PM ETJan 22 daysWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−20.0K$44.46−$889.2K−0.5%3.66M after2 lots10b5-1
Jan 4, 2024 (view filing)Jan 4Same dayPaglia John KennethDirectorSSale−1.00K$43.74−$43.7K−32.3%2.10K after10b5-1
Dec 26, 2023 (view filing)Dec 224 daysDiBella John Anthony IIBusiness Unit PresidentSSale−5.41K$45.16−$244.4K−6.3%79.8K afterAmended10b5-1
Dec 5, 2023 (view filing)6:04 PM ETDec 1-54 daysWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−60.0K$38.72−$2.32M−1.6%3.76M after4 lots10b5-1
Nov 9, 2023 (view filing)Nov 81 dayPaglia John KennethDirectorSSale−1.00K$35.25−$35.3K−24.4%3.10K after10b5-1
Nov 3, 2023 (view filing)4:04 PM ETNov 1-22 daysWoltosz Walter S and 1 otherDirector, 10% OwnerSSale−60.0K$34.39−$2.06M−1.6%3.78M after3 lots10b5-1
Jul 31, 2023 (view filing)Jul 274 daysLaVange LisaDirectorSSale−992$49.29−$48.9K−15.0%5.62K after