Company · CIK 0001023459 · SIC 7373 — Services-Computer Integrated Systems Design · Nasdaq
Simulations Plus, Inc. · SLP
Insider activity reported against this company. All insider holders · On EDGAR ↗
Reported at this company — common stock
| Trade | Reported (ET) | Insider | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Aug 3, 2026 SForm 4 → | Aug 4, 4:07 pm EDT | John Anthony DiBella IIChief Revenue Officer | 1,000 | $18.28 | $18,280 | 85,140 | −1.16% | 10b5-1 |
| Jul 6, 2026 SForm 4 → | Jul 8, 4:05 pm EDT | John Anthony DiBella IIChief Revenue Officer | 1,000 | $18.36 | $18,360 | 86,140 | −1.15% | 10b5-1 |
| Jul 1, 2026 SForm 4 → | Jul 6, 6:50 pm EDT | Walter S Woltosz +1Director, 10% Owner | 4,177 | $18.44 | $77,024 | 3,202,131 | −0.13% | 10b5-1 |
| Jun 16, 2026 SForm 4 → | Jun 17, 4:06 pm EDT | Jill Fiedler-KellyPresident, Services Solutions | 7,350 | $18.20 | $133,770 | 77,817 | −8.63% | 10b5-1 |
| Jun 16, 2026 MForm 4 → | Jun 17, 4:06 pm EDT | Jill Fiedler-KellyPresident, Services Solutions | 7,350 | $10.05 | $73,868 | 85,167 | — | 10b5-1 |
| Jun 15, 2026 SForm 4 → | Jun 16, 4:06 pm EDT | Jill Fiedler-KellyPresident, Services Solutions | 1,050 | $16.51 | $17,336 | 77,817 | −1.33% | 10b5-1 |
| Jun 15, 2026 MForm 4 → | Jun 16, 4:06 pm EDT | Jill Fiedler-KellyPresident, Services Solutions | 1,050 | $10.05 | $10,553 | 78,867 | — | 10b5-1 |
| Jun 3, 2026 SForm 4 → | Jun 4, 4:06 pm EDT | John Anthony DiBella IIChief Revenue Officer | 1,000 | $16.50 | $16,500 | 87,140 | −1.13% | 10b5-1 |
| Feb 26, 2019 SForm 4 → | Feb 28, 6:22 pm EST | Walter S Woltosz +1Director, 10% Owner | 18,500 | $20.65 | $382,025 | 5,233,039 | — | plan? |
| Feb 12, 2019 AForm 4 → | Feb 14, 6:20 pm EST | Walter S Woltosz +1Director, 10% Owner | 627 | $19.64 | $12,314 | 5,251,539 | — | plan? |
| Feb 11, 2019 AForm 4 → | Feb 12, 1:34 pm EST | Daniel L WeinerDirector | 627 | $19.52 | $12,239 | 5,006 | — | plan? |
| Feb 11, 2019 AForm 4 → | Feb 12, 1:32 pm EST | David L. RalphDirector | 627 | $19.52 | $12,239 | 21,006 | — | plan? |
| Feb 11, 2019 AForm 4 → | Feb 12, 1:30 pm EST | John Kenneth PagliaDirector | 627 | $19.52 | $12,239 | 5,006 | — | plan? |
| Jan 28, 2019 SForm 4 → | Jan 29, 7:10 pm EST | Walter S Woltosz +1Director, 10% Owner | 18,500 | $18.66 | $345,210 | 5,250,912 | −0.35% | plan? |
| Dec 10, 2018 GForm 4 → | Dec 26, 6:02 pm EST | Walter S Woltosz +1Director, 10% Owner | 115,000 | $19.70 | $2,265,500 | 5,287,912 | — | plan? late |
| Nov 28, 2018 AForm 4 → | Nov 30, 12:04 pm EST | David L. RalphDirector | 16,000 | — | — | 20,379 | — | plan? |
| Nov 27, 2018 DForm 4 → | Nov 29, 11:10 am EST | Walter S Woltosz +1Director, 10% Owner | 18,500 | $19.15 | $354,275 | 5,402,912 | — | plan? |
| Nov 19, 2018 MForm 4 → | Nov 20, 5:49 pm EST | Walter S Woltosz +1Director, 10% Owner | 21,600 | $11.65 | $251,640 | 5,421,412 | — | plan? |
| Nov 1, 2018 AForm 4 → | Nov 5, 11:34 am EST | Walter S WoltoszDirector | 404 | $20.21 | $8,165 | 5,399,812 | — | plan? |
| Nov 1, 2018 AForm 4 → | Nov 5, 8:15 am EST | John Kenneth PagliaDirector | 606 | $20.21 | $12,247 | 4,379 | — | plan? |
| Nov 1, 2018 AForm 4 → | Nov 5, 8:15 am EST | Daniel L WeinerDirector | 606 | $20.21 | $12,247 | 4,379 | — | plan? |
| Nov 1, 2018 AForm 4 → | Nov 5, 8:15 am EST | David L. RalphDirector | 606 | $20.21 | $12,247 | 4,379 | — | plan? |
| Oct 29, 2018 SForm 4 → | Nov 1, 3:47 pm EDT | Walter S Woltosz +1Director | 18,500 | $20.01 | $370,185 | 5,399,408 | −0.34% | plan? late |
| Sep 27, 2018 SForm 4 → | Sep 28, 11:25 am EDT | Walter S Woltosz +1Director, 10% Owner | 18,500 | $19.92 | $368,520 | 5,417,908 | −0.34% | plan? |
| Aug 27, 2018 SForm 4 → | Aug 28, 6:44 pm EDT | Walter S Woltosz +1Chairman, Director, 10% Owner | 18,500 | $20.33 | $376,105 | 5,436,408 | −0.34% | plan? |
| Aug 1, 2018 AForm 4 → | Aug 1, 7:59 pm EDT | Daniel L WeinerDirector | 690 | $17.75 | $12,248 | 3,773 | — | plan? |
| Aug 1, 2018 AForm 4 → | Aug 1, 7:59 pm EDT | David L. RalphDirector | 690 | $17.75 | $12,248 | 3,773 | — | plan? |
| Aug 1, 2018 AForm 4 → | Aug 1, 7:58 pm EDT | John Kenneth PagliaDirector | 690 | $17.75 | $12,248 | 3,773 | — | plan? |
| Jul 27, 2018 SForm 4 → | Jul 31, 1:21 pm EDT | Walter S Woltosz +1Director, 10% Owner | 18,500 | $17.76 | $328,560 | 5,454,908 | −0.34% | plan? |
| May 29, 2018 SForm 4 → | May 30, 4:37 pm EDT | Walter S Woltosz +1Chairman and CEO, Director, 10% Owner | 18,500 | $19.27 | $356,495 | 5,454,408 | −0.34% | plan? |
| May 1, 2018 AForm 4 → | May 2, 8:16 pm EDT | Daniel L WeinerDirector | 744 | $16.45 | $12,239 | 3,083 | — | plan? |
| May 1, 2018 AForm 4 → | May 2, 8:15 pm EDT | David L. RalphDirector | 744 | $16.45 | $12,239 | 3,083 | — | plan? |
| May 1, 2018 AForm 4 → | May 2, 8:13 pm EDT | John Kenneth PagliaDirector | 744 | $16.45 | $12,239 | 3,083 | — | plan? |
| Apr 26, 2018 SForm 4 → | Apr 27, 7:45 pm EDT | Walter S Woltosz +1Chairman and CEO, Director, 10% Owner | 18,500 | $17.20 | $318,200 | 5,472,908 | −0.34% | plan? |
| Apr 23, 2018 MForm 4 → | Apr 23, 2:26 pm EDT | Walter S Woltosz +1Chairman and CEO, Director, 10% Owner | 25,000 | $5.61 | $140,250 | 5,491,408 | — | plan? |
| Apr 20, 2018 SForm 4 → | Apr 23, 4:12 pm EDT | John Robert KneiselCFO | 2,991 | $17.64 | $52,766 | 0 | −100% | plan? |
| Apr 16, 2018 MForm 4 → | Apr 17, 1:39 pm EDT | John Robert KneiselCFO | 2,991 | $6.85 | $20,488 | 2,991 | — | plan? |
| Mar 27, 2018 SForm 4 → | Mar 28, 4:54 pm EDT | Walter S Woltosz +1Chairman and CEO, Director, 10% Owner | 18,500 | $14.54 | $268,990 | 5,466,408 | −0.34% | plan? |
| Mar 9, 2018 SForm 4 → | Mar 13, 11:22 am EDT | Thaddeus Henry Grasela Jr.President, Director | 14,781 | — | — | 79,763 | — | plan? |
| Mar 7, 2018 SForm 4 → | Mar 8, 4:36 pm EST | Thaddeus Henry Grasela Jr.President, Director | 22,001 | — | — | 94,544 | — | plan? |
| Mar 5, 2018 SForm 4 → | Mar 6, 5:06 pm EST | Thaddeus Henry Grasela Jr.President, Director | 11,681 | — | — | 116,545 | — | plan? |
| Mar 1, 2018 SForm 4 → | Mar 2, 7:29 pm EST | Thaddeus Henry Grasela Jr.President, Director | 19,724 | — | — | 128,226 | — | plan? |
| Feb 27, 2018 SForm 4 → | Feb 28, 5:22 pm EST | Thaddeus Henry Grasela Jr.President, Director | 21,930 | — | — | 147,950 | — | plan? |
| Feb 27, 2018 SForm 4 → | Feb 27, 5:47 pm EST | Walter S WoltoszChairman and CEO, Director, 10% Owner | 18,500 | $16.13 | $298,496 | 5,482,916 | −0.34% | plan? |
| Feb 23, 2018 SForm 4 → | Feb 26, 4:23 pm EST | Thaddeus Henry Grasela Jr.President, Director | 9,883 | — | — | 169,880 | — | plan? |
| Feb 1, 2018 AForm 4 → | Feb 7, 5:08 pm EST | Daniel L WeinerDirector | 752 | $16.15 | $12,145 | 2,339 | — | plan? late |
| Feb 1, 2018 AForm 4 → | Feb 7, 5:07 pm EST | David L. RalphDirector | 752 | $16.15 | $12,145 | 2,339 | — | plan? late |
| Feb 1, 2018 AForm 4 → | Feb 7, 5:06 pm EST | John Kenneth PagliaDirector | 759 | $16.15 | $12,258 | 2,339 | — | plan? late |
| Jan 24, 2018 MForm 4 → | Jan 29, 2:28 pm EST | Walter S WoltoszChairman and CEO, Director, 10% Owner | 17,500 | $5.61 | $98,175 | 5,519,916 | — | plan? late |
| Dec 27, 2017 SForm 4 → | Dec 29, 5:24 pm EST | Walter S Woltosz +1Chairman and CEO, Director, 10% Owner | 18,500 | $16.25 | $300,625 | 5,502,416 | −0.34% | plan? |
| Nov 29, 2017 SForm 4 → | Nov 29, 8:02 pm EST | Walter S WoltoszCEO, Director, 10% Owner | 18,500 | $15.78 | $291,930 | 5,610,916 | −0.33% | plan? |
| Nov 28, 2017 GForm 4 → | Dec 18, 1:34 pm EST | Walter S WoltoszChairman and CEO, Director, 10% Owner | 90,000 | $15.90 | $1,431,000 | 5,520,916 | — | plan? late |
| Nov 1, 2017 AForm 4 → | Nov 2, 4:05 pm EDT | David L. RalphDirector | 752 | — | — | 1,580 | — | plan? |
| Nov 1, 2017 AForm 4 → | Nov 2, 4:05 pm EDT | Daniel L WeinerDirector | 752 | — | — | 1,580 | — | plan? |
| Nov 1, 2017 AForm 4 → | Nov 2, 4:05 pm EDT | John Kenneth PagliaDirector | 752 | — | — | 1,580 | — | plan? |
| Oct 28, 2017 SForm 4 → | Oct 30, 6:03 pm EDT | Walter S Woltosz +1CO, Director, 10% Owner | 18,500 | $16.37 | $302,845 | 5,629,416 | −0.33% | plan? |
| Sep 27, 2017 SForm 4 → | Sep 29, 1:15 pm EDT | Walter S Woltosz +1CO, Director, 10% Owner | 18,500 | $15.45 | $285,825 | 5,647,916 | −0.33% | plan? |
| Aug 28, 2017 DForm 4 → | Aug 30, 5:19 pm EDT | Walter S WoltoszCEO, Director, 10% Owner | 18,500 | $14.15 | $261,823 | 5,666,416 | — | plan? |
| Aug 9, 2017 SForm 4 → | Aug 10, 4:30 pm EDT | Thaddeus Henry Grasela Jr.President, Director | 39,649 | — | — | 179,763 | — | plan? |
| Aug 7, 2017 SForm 4 → | Aug 8, 6:00 pm EDT | Thaddeus Henry Grasela Jr.President, Director | 28,791 | — | — | 219,412 | — | plan? |
| Aug 3, 2017 SForm 4 → | Aug 4, 5:34 pm EDT | Thaddeus Henry Grasela Jr.President, Director | 33,308 | — | — | 248,203 | — | plan? |
| Aug 2, 2017 AForm 4 → | Aug 2, 4:02 pm EDT | Daniel L WeinerDirector | 828 | — | — | 828 | — | plan? |
| Aug 2, 2017 AForm 4 → | Aug 2, 4:01 pm EDT | David L. RalphDirector | 828 | — | — | 828 | — | plan? |
| Aug 2, 2017 AForm 4 → | Aug 2, 4:01 pm EDT | John Kenneth PagliaDirector | 828 | — | — | 828 | — | plan? |
| Aug 1, 2017 SForm 4 → | Aug 2, 5:11 pm EDT | Thaddeus Henry Grasela Jr.President, Director | 28,074 | — | — | 281,511 | — | plan? |
| Jul 28, 2017 SForm 4 → | Jul 31, 4:44 pm EDT | Thaddeus Henry Grasela Jr.President, Director | 20,178 | — | — | 309,585 | — | plan? |
| Jul 27, 2017 SForm 4 → | Jul 31, 12:41 pm EDT | Walter S WoltoszCEO, Director, 10% Owner | 18,500 | $15.07 | $278,862 | 5,684,916 | −0.32% | plan? |
| Jun 7, 2017 SForm 4 → | Jun 9, 11:13 am EDT | Thaddeus Henry Grasela Jr.President, Director | 6,491 | — | — | 329,763 | — | plan? |
| Jun 5, 2017 SForm 4 → | Jun 6, 4:49 pm EDT | Thaddeus Henry Grasela Jr.President, Director | 17,563 | — | — | 336,254 | — | plan? |
| Jun 1, 2017 SForm 4 → | Jun 2, 5:26 pm EDT | Thaddeus Henry Grasela Jr.President, Director | 16,961 | — | — | 353,817 | — | plan? |
| May 30, 2017 SForm 4 → | May 31, 6:40 pm EDT | Thaddeus Henry Grasela Jr.President, Director | 10,122 | — | — | 370,778 | — | plan? |
| May 25, 2017 SForm 4 → | May 26, 4:26 pm EDT | Thaddeus Henry Grasela Jr.President, Director | 11,832 | — | — | 380,900 | — | plan? |
| May 24, 2017 SForm 4 → | May 26, 11:55 am EDT | Argenio David Z DOther | 2,674 | $11.68 | $31,232 | 33,608 | −7.37% | plan? |
| May 19, 2017 SForm 4 → | May 24, 10:44 am EDT | Argenio David Z DOther | 21,326 | $11.59 | $247,147 | 36,282 | −37.0% | plan? late |
| May 18, 2017 SForm 4 → | May 24, 5:26 pm EDT | Thaddeus Henry Grasela Jr.President, Director | 37,031 | $11.63 | $430,722 | 392,732 | −8.62% | plan? late |
| May 10, 2017 SForm 4 → | May 19, 11:55 am EDT | Argenio David Z DOther | 7,304 | $11.46 | $83,718 | 57,608 | −11.3% | plan? late |
| May 9, 2017 SForm 4 → | May 11, 6:39 pm EDT | Virginia E Woltosz +1Secretary-Treasurer, 10% Owner | 19,524 | $12.45 | $243,074 | 5,703,416 | −0.34% | plan? |
| May 4, 2017 SForm 4 → | May 8, 6:58 pm EDT | Walter S WoltoszChairman and CEO, Director, 10% Owner | 24,596 | $12.52 | $307,942 | 5,837,940 | −0.42% | plan? |
| Mar 2, 2017 MForm 4 → | Mar 2, 1:34 pm EST | Argenio David Z DOther | 5,500 | $6.69 | $36,780 | 64,912 | — | plan? |
| Nov 22, 2016 MForm 4 → | Nov 23, 12:27 pm EST | Argenio David Z DDirector | 4,000 | $4.78 | $19,120 | 59,412 | — | plan? |
| Nov 17, 2016 GForm 4 → | Nov 22, 9:13 pm EST | Walter S WoltoszChairman and CEO, Director, 10% Owner | 115,000 | $10.55 | $1,213,250 | 5,747,536 | — | plan? late |
| Nov 16, 2016 AForm 4 → | Nov 18, 2:40 pm EST | Walter S WoltoszChairman and CEO, Director, 10% Owner | 12,000 | $10.01 | $120,120 | 5,862,536 | — | plan? |
| Jul 27, 2016 JForm 4 → | Jul 29, 8:12 pm EDT | Thaddeus Henry Grasela Jr.President, Director | 110,509 | $6.35 | $701,732 | 429,763 | — | plan? |
| Jun 20, 2016 MForm 4 → | Jun 20, 7:51 pm EDT | Argenio David Z DDirector | 11,600 | $3.33 | $38,668 | 55,412 | — | plan? |
| Jan 29, 2016 SForm 4 → | Feb 2, 4:16 pm EST | Walter S WoltoszCEO, Director, 10% Owner | 58,181 | $11.27 | $655,973 | 5,895,721 | −0.98% | plan? |
| Jan 21, 2016 DForm 4 → | Jan 25, 5:11 pm EST | Walter S WoltoszChairman and CEO, Director, 10% Owner | 32,076 | $11.21 | $359,508 | 5,953,902 | — | plan? |
| Oct 1, 2015 GForm 4 → | Oct 5, 4:10 pm EDT | Walter S Woltosz +1Chairman and CEO, Director, 10% Owner | 97,000 | $8.20 | $795,400 | 5,952,793 | — | plan? |
Reported at this company — derivatives (options, RSUs, warrants)
| Trade | Reported (ET) | Insider | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Jun 16, 2026 MForm 4 → | Jun 17, 4:06 pm EDT | Jill Fiedler-KellyPresident, Services Solutions | 7,350 | — | — | 0 | — | 10b5-1 |
| Jun 15, 2026 MForm 4 → | Jun 16, 4:06 pm EDT | Jill Fiedler-KellyPresident, Services Solutions | 1,050 | — | — | 7,350 | — | 10b5-1 |
| Jan 15, 2019 MForm 4 → | Jan 16, 2:11 pm EST | John Anthony DiBella IIDivision President | 5,000 | $1.00 | $5,000 | 0 | — | |
| Dec 11, 2018 AForm 4 → | Dec 13, 1:38 pm EST | John Robert KneiselCFO | 5,000 | $19.81 | $99,050 | 51,900 | — | |
| Dec 11, 2018 AForm 4 → | Dec 13, 1:36 pm EST | John Anthony DiBella IIDivision President | 8,000 | $19.81 | $158,480 | 113,300 | — | |
| Nov 28, 2018 CForm 4 → | Nov 30, 12:04 pm EST | David L. RalphDirector | 16,000 | $5.96 | $95,390 | 0 | — | |
| Jul 11, 2018 MForm 4 → | Jul 12, 5:41 pm EDT | Walter S Woltosz +1Director, 10% Owner | 37,500 | $6.40 | $240,000 | 5,473,408 | — | |
| Apr 16, 2018 MForm 4 → | Apr 17, 1:39 pm EDT | John Robert KneiselCFO | 5,000 | $6.85 | $34,250 | 46,900 | — | |
| Nov 16, 2017 AForm 4 → | Nov 20, 3:54 pm EST | Walter S WoltoszCEO, Director, 10% Owner | 12,000 | — | — | 104,000 | — | |
| Aug 31, 2017 AForm 4 → | Sep 5, 8:18 am EDT | Daniel L WeinerDirector | 416 | $14.50 | $6,032 | 416 | — | |
| Aug 31, 2017 AForm 4 → | Sep 5, 8:17 am EDT | David L. RalphDirector | 3,750 | $14.50 | $54,375 | 3,750 | — | |
| Aug 31, 2017 AForm 4 → | Sep 5, 8:15 am EDT | John Kenneth PagliaDirector | 3,750 | $14.50 | $54,375 | 3,750 | — | |
| Mar 2, 2017 XForm 4 → | Mar 2, 1:34 pm EST | Argenio David Z DOther | 5,500 | $6.69 | $36,780 | 13,500 | — | |
| Feb 23, 2017 AForm 4 → | Feb 27, 4:30 pm EST | John Robert KneiselCFO | 26,900 | $10.05 | $270,345 | 51,900 | — | |
| Feb 23, 2017 AForm 4 → | Feb 27, 4:29 pm EST | Thaddeus Henry Grasela Jr.President, Director | 9,700 | $10.05 | $97,485 | 10,200 | — | |
| Feb 23, 2017 AForm 4 → | Feb 27, 4:29 pm EST | John Anthony DiBella IIVP Sales & Marketing | 40,000 | $10.05 | $402,000 | 107,300 | — | |
| Nov 22, 2016 XForm 4 → | Nov 23, 12:27 pm EST | Argenio David Z DDirector | 4,000 | $4.78 | $19,120 | 19,000 | — | |
| Aug 31, 2016 AForm 4 → | Sep 2, 3:31 pm EDT | David L. RalphDirector | 5,000 | $8.62 | $43,100 | 21,000 | — | |
| Aug 31, 2016 AForm 4 → | Sep 2, 10:37 am EDT | Argenio David Z DDirector | 5,000 | $8.62 | $43,100 | 23,000 | — | |
| Aug 31, 2016 AForm 4 → | Sep 2, 8:27 am EDT | John Kenneth PagliaDirector | 5,000 | $8.62 | $43,100 | 8,750 | — | |
| Jun 20, 2016 XForm 4 → | Jun 20, 7:51 pm EDT | Argenio David Z DDirector | 11,600 | $3.33 | $38,668 | 18,000 | — | |
| Feb 25, 2016 AForm 4 → | Feb 29, 6:14 pm EST | John Robert KneiselCFO | 8,700 | $9.71 | $84,477 | 26,900 | — | |
| Dec 2, 2015 AForm 4/A → | Jan 20, 2016, 6:07 pm EST | Walter S WoltoszChairman and CEO, Director, 10% Owner | 12,000 | $8.93 | $107,160 | 98,000 | — | |
| Aug 31, 2015 AForm 4 → | Sep 2, 11:44 am EDT | Argenio David Z DDirector | 5,000 | $6.75 | $33,750 | 29,600 | — | |
| Aug 31, 2015 AForm 4 → | Sep 1, 3:52 pm EDT | John Kenneth PagliaDirector | 3,750 | $6.75 | $25,313 | 3,750 | — | |
| Aug 31, 2015 AForm 4 → | Sep 1, 1:44 pm EDT | David L. RalphDirector | 5,000 | $6.75 | $33,750 | 16,000 | — |