Quick Takeaways
- SLP - Simulations Plus, Inc. has 15 insiders with reported activity on this page.
- Net insider value flow over the last year: -$1,737,826.
- Recent transaction rows are available for direct filing-level review.
Insider Transactions Reported by 15 Insiders of Simulations Plus, Inc.
- Symbol
- SLP on Nasdaq
- Location
- Research Triangle Park, NC
What Changed
- Buy value: ; sell value: $1,737,826.
- Net share flow: -94,600.
Why This Matters
- This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
- Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.
Source Evidence
Filed on Form 4
See Original Filing
Issuer insider activity is sourced from SEC Forms 3, 4, and 5.
Insider trading overview
Last 12 monthsNet insider flow leans to selling over the last 12 months. Net value: -$1,737,826.
Buys
$0
Shares: 0
Insiders: 0
Sells
$1,737,826
Shares: 94,600
Insiders: 4
Net
-$1,737,826
Shares: -94,600
Insiders: -4
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 0 | 32,000 | $0 | $482,250 | -$482,250 |
| 3-6 | 0 | 866 | $0 | $14,644 | -$14,644 |
| 6-9 | 0 | 20,867 | $0 | $320,025 | -$320,025 |
| 9-12 | 0 | 40,867 | $0 | $920,908 | -$920,908 |
Simulations Plus, Inc. executives and other stock owners filed with the SEC include:
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Virginia E. Woltosz | 10%+ Owner | $49,441,814 | -$226,950 | -0.46% | Filing P/S | 04 May 2026 |
| Walter S. Woltosz | Director, 10%+ Owner | $49,441,814 | -$1,444,447 | -2.8% | Filing P/S | 04 May 2026 |
| John Anthony DiBella II | Chief Revenue Officer | $1,320,337 | -$28,350 | -2.1% | Filing P/S | 04 May 2026 |
| Jill Fiedler-Kelly | President, Services Solutions | $755,603 | Mixed | 28 Jan 2026 | ||
| David L. Ralph | Director | $559,741 | Mixed | 30 Nov 2021 | ||
| Sharlene Evans | Director | $202,984 | Median | 01 May 2026 | ||
| Daniel L. Weiner | Director | $195,585 | Median | 01 May 2026 | ||
| John Kenneth Paglia | Director | $172,441 | Median | 01 May 2026 | ||
| Lisa LaVange | Director | $168,558 | -$38,079 | -18% | Filing P/S | 01 Dec 2025 |
| William W. Frederick | Evp/Cfo | Mixed | 16 Oct 2025 | |||
| Brett Howell | Business Unit President | Mixed | 19 Oct 2023 | |||
| Steven Chang | President, Immunetrics | Mixed | 19 Oct 2023 | |||
| Daniel Szot | Chief Revenue Officer | Mixed | 17 Oct 2024 | |||
| Michael E. Raymer | Business Unit President | Mixed | 11 Jun 2024 | |||
| Shawn Oconnor | Chief Executive Officer | Mixed | 16 Oct 2025 |
Top shareholders of Simulations Plus, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| Conestoga Capital Advisors, LLC |
13D/G
|
Conestoga Capital Advisors |
12%
|
2,398,875
|
$85,160,062 | $0 | 31 Dec 2024 | |
| Virginia E. Woltosz |
3/4/5
|
10%+ Owner |
16%
|
3,267,800
|
$49,441,814 | -$226,950 | 04 May 2026 | |
| Walter S. Woltosz |
3/4/5
|
Director, 10%+ Owner |
16%
|
3,267,800
|
$49,441,814 | -$1,444,447 | 04 May 2026 | |
| First Light Asset Management, LLC |
13D/G
13F
|
Company |
13%
|
2,649,879
|
$48,307,294 | $0 | 31 Jan 2026 | |
| BlackRock, Inc. |
13F
13D/G
|
Company |
5.8%
from 13D/G
|
1,256,672
|
$22,909,130 | — | 31 Dec 2025 | |
| VANGUARD GROUP INC |
13F
|
Company |
5%
|
1,011,706
|
$18,443,400 | — | 31 Dec 2025 | |
| MORGAN STANLEY |
13F
|
Company |
5%
|
1,000,149
|
$18,232,734 | — | 31 Dec 2025 | |
| MARSHALL WACE, LLP |
13F
|
Company |
2.8%
|
569,783
|
$10,387,144 | — | 31 Dec 2025 | |
| Rockefeller Capital Management L.P. |
13F
|
Company |
2.8%
|
557,866
|
$10,169,897 | — | 31 Dec 2025 | |
| Tributary Capital Management, LLC |
13F
|
Company |
2.6%
|
520,855
|
$9,495,179 | — | 31 Dec 2025 | |
| Stephens Investment Management Group LLC |
13F
|
Company |
2.5%
|
513,728
|
$9,365,261 | — | 31 Dec 2025 | |
| First Eagle Investment Management, LLC |
13F
|
Company |
2.3%
|
457,155
|
$8,333,935 | — | 31 Dec 2025 | |
| GOLDMAN SACHS GROUP INC |
13F
|
Company |
2.1%
|
427,865
|
$7,799,981 | — | 31 Dec 2025 | |
| ROYCE & ASSOCIATES LP |
13F
|
Company |
2%
|
402,416
|
$7,336,044 | — | 31 Dec 2025 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
2%
|
399,811
|
$7,289,973 | — | 31 Dec 2025 | |
| KENNEDY CAPITAL MANAGEMENT LLC |
13F
|
Company |
2%
|
398,902
|
$7,271,983 | — | 31 Dec 2025 | |
| STATE STREET CORP |
13F
|
Company |
1.8%
|
364,773
|
$6,649,812 | — | 31 Dec 2025 | |
| DIMENSIONAL FUND ADVISORS LP |
13F
|
Company |
1.7%
|
348,234
|
$6,348,255 | — | 31 Dec 2025 | |
| Meros Investment Management, LP |
13F
|
Company |
1.7%
|
339,242
|
$6,184,382 | — | 31 Dec 2025 | |
| CITADEL ADVISORS LLC |
13F
|
Company |
1.4%
|
277,015
|
$5,049,983 | — | 31 Dec 2025 | |
| NICHOLAS COMPANY, INC. |
13F
|
Company |
1.3%
|
262,712
|
$4,789,240 | — | 31 Dec 2025 | |
| D. E. Shaw & Co., Inc. |
13F
|
Company |
1.1%
|
225,981
|
$4,119,634 | — | 31 Dec 2025 | |
| TWO SIGMA INVESTMENTS, LP |
13F
|
Company |
1.1%
|
224,053
|
$4,084,486 | — | 31 Dec 2025 | |
| Squarepoint Ops LLC |
13F
|
Company |
1.1%
|
223,084
|
$4,066,821 | — | 31 Dec 2025 | |
| HERALD INVESTMENT MANAGEMENT Ltd |
13F
|
Company |
0.99%
|
200,000
|
$3,642,000 | — | 31 Dec 2025 | |
| ENVESTNET ASSET MANAGEMENT INC |
13F
|
Company |
0.97%
|
196,337
|
$3,579,222 | — | 31 Dec 2025 | |
| NORTHERN TRUST CORP |
13F
|
Company |
0.93%
|
187,514
|
$3,418,380 | — | 31 Dec 2025 | |
| JANE STREET GROUP, LLC |
13F
|
Company |
0.84%
|
169,053
|
$3,081,836 | — | 31 Dec 2025 | |
| North Star Investment Management Corp. |
13F
|
Company |
0.83%
|
168,130
|
$3,065,010 | — | 31 Dec 2025 | |
| BANK OF AMERICA CORP /DE/ |
13F
|
Company |
0.83%
|
166,423
|
$3,033,891 | — | 31 Dec 2025 | |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC |
13F
|
Company |
0.75%
|
150,986
|
$2,752,475 | — | 31 Dec 2025 | |
| MILLENNIUM MANAGEMENT LLC |
13F
|
Company |
0.73%
|
147,490
|
$2,688,743 | — | 31 Dec 2025 | |
| Kopion Asset Management, LLC |
13F
|
Company |
0.67%
|
134,388
|
$2,449,893 | — | 31 Dec 2025 | |
| Point72 Asset Management, L.P. |
13F
|
Company |
0.65%
|
130,933
|
$2,386,909 | — | 31 Dec 2025 | |
| JPMORGAN CHASE & CO |
13F
|
Company |
0.65%
|
130,280
|
$2,375,004 | — | 31 Dec 2025 | |
| TUDOR INVESTMENT CORP ET AL |
13F
|
Company |
0.58%
|
116,685
|
$2,127,168 | — | 31 Dec 2025 | |
| CITIGROUP INC |
13F
|
Company |
0.53%
|
107,221
|
$1,954,639 | — | 31 Dec 2025 | |
| AQR CAPITAL MANAGEMENT LLC |
13F
|
Company |
0.51%
|
101,979
|
$1,859,077 | — | 31 Dec 2025 | |
| PRESCOTT GROUP CAPITAL MANAGEMENT, L.L.C. |
13F
|
Company |
0.5%
|
100,885
|
$1,839,134 | — | 31 Dec 2025 | |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P |
13F
|
Company |
0.48%
|
97,000
|
$1,768,310 | — | 31 Dec 2025 | |
| PDT Partners, LLC |
13F
|
Company |
0.48%
|
95,792
|
$1,746,288 | — | 31 Dec 2025 | |
| UBS Group AG |
13F
|
Company |
0.38%
|
76,955
|
$1,402,890 | — | 31 Dec 2025 | |
| WELLS FARGO & COMPANY/MN |
13F
|
Company |
0.38%
|
76,099
|
$1,387,289 | — | 31 Dec 2025 | |
| John Anthony DiBella II |
3/4/5
|
Chief Revenue Officer |
0.44%
|
88,140
|
$1,320,337 | -$28,350 | 04 May 2026 | |
| RICE HALL JAMES & ASSOCIATES, LLC |
13F
|
Company |
0.35%
|
70,185
|
$1,279,473 | — | 31 Dec 2025 | |
| Susquehanna Portfolio Strategies, LLC |
13F
|
Company |
0.33%
|
67,002
|
$1,221,446 | — | 31 Dec 2025 | |
| Connor, Clark & Lunn Investment Management Ltd. |
13F
|
Company |
0.33%
|
66,305
|
$1,208,740 | — | 31 Dec 2025 | |
| Bank of New York Mellon Corp |
13F
|
Company |
0.31%
|
62,748
|
$1,143,891 | — | 31 Dec 2025 | |
| GSA CAPITAL PARTNERS LLP |
13F
|
Company |
0.31%
|
62,322
|
$1,136,000 | — | 31 Dec 2025 | |
| TWO SIGMA ADVISERS, LP |
13F
|
Company |
0.28%
|
55,900
|
$1,019,057 | — | 31 Dec 2025 |
Recent Insider Transactions by Companies or Individuals for Simulations Plus, Inc.
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| John Anthony DiBella II | SLP | Common Stock | Sale | -1.12% | $14,980 | $14.98 | -1,000 | 88,140 | 04 May 2026 | Direct |
| Walter S. Woltosz | SLP | Common Stock | Sale | -0.46% | $226,950 | $15.13 | -15,000 | 3,267,800 | 04 May 2026 | Direct |
| Walter S. Woltosz | SLP | Common Stock | Sale | -0.46% | $226,950 | $15.13 | -15,000 | 3,267,800 | 04 May 2026 | Direct |
| Sharlene Evans | SLP | Common Stock | Award | 14.1% | 2,117 | 17,173 | 01 May 2026 | Direct | ||
| Walter S. Woltosz | SLP | Common Stock | Award | 0.06% | 2,117 | 3,282,800 | 01 May 2026 | Direct | ||
| Daniel L. Weiner | SLP | Common Stock | Award | 14.7% | 2,117 | 16,547 | 01 May 2026 | Direct | ||
| John Kenneth Paglia | SLP | Common Stock | Award | 17% | 2,117 | 14,589 | 01 May 2026 | Direct | ||
| John Anthony DiBella II | SLP | Common Stock | Sale | -1.11% | $13,370 | $13.37 | -1,000 | 89,140 | 15 Apr 2026 | Direct |
| John Anthony DiBella II | SLP | Common Stock | Options Exercise | 12.9% | 10,300 | 90,140 | 06 Feb 2026 | Direct | ||
| John Anthony DiBella II | SLP | Stock Options (Right to Buy) | Options Exercise | -100% | -10,300 | 0 | 06 Feb 2026 | Direct | ||
| Sharlene Evans | SLP | Common Stock | Award | 13.4% | 1,776 | 15,056 | 30 Jan 2026 | Direct | ||
| John Kenneth Paglia | SLP | Common Stock | Award | 16.6% | 1,776 | 12,472 | 30 Jan 2026 | Direct | ||
| Walter S. Woltosz | SLP | Common Stock | Award | 0.05% | 1,776 | 3,280,683 | 30 Jan 2026 | Direct | ||
| Daniel L. Weiner | SLP | Common Stock | Award | 14% | 1,776 | 14,430 | 30 Jan 2026 | Direct | ||
| Jill Fiedler-Kelly | SLP | Common Stock | Options Exercise | 13% | 8,950 | 77,817 | 28 Jan 2026 | Direct | ||
| Jill Fiedler-Kelly | SLP | Employee Stock Option (Right to Buy) | Options Exercise | -100% | -8,950 | 0 | 28 Jan 2026 | Direct | ||
| Walter S. Woltosz | SLP | Common Stock | Gift | -0.28% | -9,095 | 3,278,907 | 18 Dec 2025 | Direct | ||
| Lisa LaVange | SLP | Common Stock | Sale | -7.99% | $14,644 | $16.91 | -866 | 9,968 | 01 Dec 2025 | Direct |
| Sharlene Evans | SLP | Common Stock | Award | 15.4% | 1,771 | 13,280 | 03 Nov 2025 | Direct | ||
| Lisa LaVange | SLP | Common Stock | Award | 19.5% | 1,771 | 10,834 | 03 Nov 2025 | Direct | ||
| John Kenneth Paglia | SLP | Common Stock | Award | 19.8% | 1,771 | 10,696 | 03 Nov 2025 | Direct | ||
| Walter S. Woltosz | SLP | Common Stock | Award | 0.05% | 1,771 | 3,288,002 | 03 Nov 2025 | Direct | ||
| Daniel L. Weiner | SLP | Common Stock | Award | 16.3% | 1,771 | 12,654 | 03 Nov 2025 | Direct | ||
| Shawn Oconnor | SLP | Stock Options (Right to Buy) | Award | 50,000 | 50,000 | 16 Oct 2025 | Direct | |||
| William W. Frederick | SLP | Stock Options (Right to Buy) | Award | 32,500 | 32,500 | 16 Oct 2025 | Direct | |||
| Jill Fiedler-Kelly | SLP | Stock Options (Right to Buy) | Award | 27,500 | 27,500 | 16 Oct 2025 | Direct | |||
| John Anthony DiBella II | SLP | Stock Options (Right to Buy) | Award | 27,500 | 27,500 | 16 Oct 2025 | Direct | |||
| Walter S. Woltosz | SLP | Common Stock | Sale | -0.6% | $307,800 | $15.39 | -20,000 | 3,286,231 | 01 Oct 2025 | Direct |
| Lisa LaVange | SLP | Common Stock | Sale | -8.73% | $12,225 | $14.10 | -867 | 9,063 | 02 Sep 2025 | Direct |
| Walter S. Woltosz | SLP | Common Stock | Award | 0.06% | 2,074 | 3,306,231 | 01 Aug 2025 | Direct | ||
| Daniel L. Weiner | SLP | Common Stock | Award | 23.5% | 2,074 | 10,883 | 01 Aug 2025 | Direct | ||
| John Kenneth Paglia | SLP | Common Stock | Award | 30.3% | 2,074 | 8,925 | 01 Aug 2025 | Direct | ||
| Sharlene Evans | SLP | Common Stock | Award | 22% | 2,074 | 11,509 | 01 Aug 2025 | Direct | ||
| Lisa LaVange | SLP | Common Stock | Sale | -8.03% | $11,210 | $12.93 | -867 | 9,930 | 01 Aug 2025 | Direct |
| Lisa LaVange | SLP | Common Stock | Award | 23.8% | 2,074 | 10,797 | 01 Aug 2025 | Direct | ||
| Walter S. Woltosz | SLP | Common Stock | Sale | -0.6% | $366,623 | $18.33 | -20,000 | 3,304,157 | 01 Jul 2025 | Direct |
| Walter S. Woltosz | SLP | Common Stock | Sale | -0.6% | $543,074 | $27.15 | -20,000 | 3,324,157 | 02 Jun 2025 | Direct |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.