Simulations Plus, Inc. (SLP) · Insider trading
What Simulations Plus's directors, officers and largest holders bought and sold themselves, from the Form 4 each of them files with the SEC within two business days of a trade. Open-market purchases and sales first: those are the trades somebody chose to make at the market price.
Bought, 12 months
$0
0 insiders, 0 trades
Sold, 12 months
$829,193
4 insiders, 100% under a plan
Net, 12 months
−$829,193
bought less sold
Latest filing
2026-10-06
filings read to 2026-10-19
Who traded, two years
| Insider | Bought | Sold | Trades | Last trade | Holds after |
|---|---|---|---|---|---|
| Woltosz Walter SDirector, 10% owner | – | $5.93M | 22 | 2026-07-01 | 3,202,131 |
| Fiedler-Kelly JillPresident, Services Solutions | – | $167,636 | 3 | 2026-06-16 | 77,817 |
| DiBella John Anthony IIChief Revenue Officer | – | $81,490 | 5 | 2026-08-03 | 85,140 |
| LaVange LisaDirector | – | $58,801 | 4 | 2025-12-01 | 9,968 |
| Weiner Daniel LDirector | – | $21,375 | 1 | 2024-12-27 | 7,236 |
Open-market purchases and sales
Newest first. “Plan” marks a trade made under a 10b5-1 plan set up in advance.
| Date | Insider | Trade | Shares | Price | Value | Holds after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-08-03 | DiBella John Anthony IIChief Revenue Officer | Saleplan | 1,000 | 18.28 | $18,280 | 85,140 | Form 4 |
| 2026-07-06 | DiBella John Anthony IIChief Revenue Officer | Saleplan | 1,000 | 18.36 | $18,360 | 86,140 | Form 4 |
| 2026-07-01 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 4,177 | 18.44 | $77,024 | 3,202,131 | Form 4 |
| 2026-06-16 | Fiedler-Kelly JillPresident, Services Solutions | Saleplan | 7,350 | 18.20 | $133,770 | 77,817 | Form 4 |
| 2026-06-15 | Fiedler-Kelly JillPresident, Services Solutions | Saleplan | 1,050 | 16.51 | $17,336 | 77,817 | Form 4 |
| 2026-06-03 | DiBella John Anthony IIChief Revenue Officer | Saleplan | 1,000 | 16.50 | $16,500 | 87,140 | Form 4 |
| 2026-06-01 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 15,000 | 17.43 | $261,450 | 3,252,800 | Form 4 |
| 2026-05-11 | Fiedler-Kelly JillPresident, Services Solutions | Saleplan | 1,000 | 16.53 | $16,530 | 77,817 | Form 4 |
| 2026-05-04 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 15,000 | 15.13 | $226,950 | 3,267,800 | Form 4 |
| 2026-05-04 | DiBella John Anthony IIChief Revenue Officer | Saleplan | 1,000 | 14.98 | $14,980 | 88,140 | Form 4 |
| 2026-04-15 | DiBella John Anthony IIChief Revenue Officer | Saleplan | 1,000 | 13.37 | $13,370 | 89,140 | Form 4 |
| 2025-12-01 | LaVange LisaDirector | Saleplan | 866 | 16.91 | $14,644 | 9,968 | Form 4 |
| 2025-10-01 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 20,000 | 15.39 | $307,800 | 3,286,231 | Form 4 |
| 2025-09-02 | LaVange LisaDirector | Saleplan | 867 | 14.10 | $12,225 | 9,063 | Form 4 |
| 2025-08-01 | LaVange LisaDirector | Saleplan | 867 | 12.93 | $11,210 | 9,930 | Form 4 |
| 2025-07-01 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 7,776 | 17.94 | $139,501 | 3,316,381 | Form 4 |
| 2025-07-01 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 12,224 | 18.58 | $227,122 | 3,304,157 | Form 4 |
| 2025-06-02 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 15,500 | 26.72 | $414,160 | 3,328,657 | Form 4 |
| 2025-06-02 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 2,700 | 27.71 | $74,817 | 3,325,957 | Form 4 |
| 2025-06-02 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 700 | 29.13 | $20,391 | 3,325,257 | Form 4 |
| 2025-06-02 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 1,000 | 30.57 | $30,570 | 3,324,257 | Form 4 |
| 2025-06-02 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 100 | 31.36 | $3,136 | 3,324,157 | Form 4 |
| 2025-05-01 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 9,396 | 33.20 | $311,947 | 3,354,761 | Form 4 |
| 2025-05-01 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 10,604 | 33.78 | $358,203 | 3,344,157 | Form 4 |
| 2025-04-01 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 17,400 | 24.01 | $417,774 | 3,365,971 | Form 4 |
| 2025-04-01 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 2,600 | 24.62 | $64,012 | 3,363,371 | Form 4 |
| 2025-03-03 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 20,000 | 28.68 | $573,600 | 3,383,371 | Form 4 |
| 2025-02-03 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 5,579 | 33.53 | $187,064 | 3,417,005 | Form 4 |
| 2025-02-03 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 14,421 | 34.06 | $491,179 | 3,402,584 | Form 4 |
| 2025-01-02 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 19,900 | 27.88 | $554,812 | 3,422,684 | Form 4 |
| 2025-01-02 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 100 | 28.50 | $2,850 | 3,422,584 | Form 4 |
| 2024-12-27 | Weiner Daniel LDirector | Saleplan | 750 | 28.50 | $21,375 | 7,236 | Form 4 |
| 2024-12-02 | LaVange LisaDirector | Saleplan | 650 | 31.88 | $20,722 | 7,150 | Form 4 |
| 2024-12-02 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 20,000 | 31.76 | $635,200 | 3,442,584 | Form 4 |
| 2024-11-01 | Woltosz Walter SDirector, 10% ownerwith Woltosz Virginia e | Saleplan | 20,000 | 27.66 | $553,200 | 3,462,584 | Form 4 |
Grants, exercises and other transactions
Pay, tax and paperwork rather than a choice to trade at the market price. Two years.
33 × grant or award7 × returned to the company5 × option exercise1 × gift
Show them
| Date | Insider | What | Shares | Price | Holds after | Filing |
|---|---|---|---|---|---|---|
| 2026-10-06 | Woltosz Walter SDirector, 10% owner | Returned to the company D | −3,202,131 | 18.50 | 0 | Form 4 |
| 2026-10-06 | Weiner Daniel LDirector | Returned to the company D | −16,547 | 18.50 | 0 | Form 4 |
| 2026-10-06 | Paglia John KennethDirector | Returned to the company D | −14,589 | 18.50 | 0 | Form 4 |
| 2026-10-06 | Frederick William WEVP/CFO | Returned to the company D | −2,100 | 18.50 | 0 | Form 4 |
| 2026-10-06 | Fiedler-Kelly JillPresident, Services Solutions | Returned to the company D | −77,817 | 18.50 | 0 | Form 4 |
| 2026-10-06 | Evans SharleneDirector | Returned to the company D | −17,173 | 18.50 | 0 | Form 4 |
| 2026-10-06 | DiBella John Anthony IIChief Revenue Officer | Returned to the company D | −85,140 | 18.50 | 0 | Form 4 |
| 2026-06-16 | Fiedler-Kelly JillPresident, Services Solutions | Option exercise M | +7,350 | 10.05 | 85,167 | Form 4 |
| 2026-06-15 | Fiedler-Kelly JillPresident, Services Solutions | Option exercise M | +1,050 | 10.05 | 78,867 | Form 4 |
| 2026-05-11 | Fiedler-Kelly JillPresident, Services Solutions | Option exercise M | +1,000 | 10.05 | 78,817 | Form 4 |
| 2026-05-01 | Weiner Daniel LDirector | Grant or award A | +2,117 | – | 16,547 | Form 4 |
| 2026-05-01 | Woltosz Walter SDirector, 10% owner | Grant or award A | +2,117 | – | 3,282,800 | Form 4 |
| 2026-05-01 | Paglia John KennethDirector | Grant or award A | +2,117 | – | 14,589 | Form 4 |
| 2026-05-01 | Evans SharleneDirector | Grant or award A | +2,117 | – | 17,173 | Form 4 |
| 2026-02-06 | DiBella John Anthony IIChief Revenue Officer | Option exercise M | +10,300 | 9.71 | 90,140 | Form 4 |
| 2026-01-30 | Weiner Daniel LDirector | Grant or award A | +1,776 | – | 14,430 | Form 4 |
| 2026-01-30 | Woltosz Walter SDirector, 10% owner | Grant or award A | +1,776 | – | 3,280,683 | Form 4 |
| 2026-01-30 | Paglia John KennethDirector | Grant or award A | +1,776 | – | 12,472 | Form 4 |
| 2026-01-30 | Evans SharleneDirector | Grant or award A | +1,776 | – | 15,056 | Form 4 |
| 2026-01-28 | Fiedler-Kelly JillPresident, Services Solutions | Option exercise M | +8,950 | 9.71 | 77,817 | Form 4 |
| 2025-12-18 | Woltosz Walter SDirector, 10% owner | Gift G | −9,095 | – | 3,278,907 | Form 4 |
| 2025-11-03 | Weiner Daniel LDirector | Grant or award A | +1,771 | – | 12,654 | Form 4 |
| 2025-11-03 | Woltosz Walter SDirector, 10% owner | Grant or award A | +1,771 | – | 3,288,002 | Form 4 |
| 2025-11-03 | Paglia John KennethDirector | Grant or award A | +1,771 | – | 10,696 | Form 4 |
| 2025-11-03 | LaVange LisaDirector | Grant or award A | +1,771 | – | 10,834 | Form 4 |
| 2025-11-03 | Evans SharleneDirector | Grant or award A | +1,771 | – | 13,280 | Form 4 |
| 2025-08-01 | LaVange LisaDirector | Grant or award A | +2,074 | – | 10,797 | Form 4 |
| 2025-08-01 | Evans SharleneDirector | Grant or award A | +2,074 | – | 11,509 | Form 4 |
| 2025-08-01 | Paglia John KennethDirector | Grant or award A | +2,074 | – | 8,925 | Form 4 |
| 2025-08-01 | Weiner Daniel LDirector | Grant or award A | +2,074 | – | 10,883 | Form 4 |
| 2025-08-01 | Woltosz Walter SDirector, 10% owner | Grant or award A | +2,074 | – | 3,306,231 | Form 4 |
| 2025-05-01 | Paglia John KennethDirector | Grant or award A | +786 | – | 6,851 | Form 4 |
| 2025-05-01 | Weiner Daniel LDirector | Grant or award A | +786 | – | 8,809 | Form 4 |
| 2025-05-01 | LaVange LisaDirector | Grant or award A | +786 | – | 8,723 | Form 4 |
| 2025-05-01 | Evans SharleneDirector | Grant or award A | +786 | – | 9,435 | Form 4 |
| 2025-05-01 | Woltosz Walter SDirector, 10% owner | Grant or award A | +786 | – | 3,364,157 | Form 4 |
| 2025-02-03 | Woltosz Walter SDirector, 10% owner | Grant or award A | +787 | – | 3,403,371 | Form 4 |
| 2025-02-03 | LaVange LisaDirector | Grant or award A | +787 | – | 7,937 | Form 4 |
| 2025-02-03 | Evans SharleneDirector | Grant or award A | +787 | – | 8,649 | Form 4 |
| 2025-02-03 | Weiner Daniel LDirector | Grant or award A | +787 | – | 8,023 | Form 4 |
| 2025-02-03 | Paglia John KennethDirector | Grant or award A | +787 | – | 6,065 | Form 4 |
| 2024-11-01 | Woltosz Walter SDirector, 10% owner | Grant or award A | +992 | – | 3,482,584 | Form 4 |
| 2024-11-01 | Evans SharleneDirector | Grant or award A | +992 | – | 7,862 | Form 4 |
| 2024-11-01 | LaVange LisaDirector | Grant or award A | +992 | – | 7,800 | Form 4 |
| 2024-11-01 | Weiner Daniel LDirector | Grant or award A | +992 | – | 7,986 | Form 4 |
| 2024-11-01 | Paglia John KennethDirector | Grant or award A | +992 | – | 5,278 | Form 4 |
How to read it
- Buy, sale
- Code P and S on the form: shares bought or sold in the market, at the market price. The other codes are mostly pay (a grant, an option exercised) or tax (shares the company withheld), and say little about what the insider thinks of the price.
- Plan
- A sale or purchase under a Rule 10b5-1 plan, set up in advance and running on its own schedule. Since April 2023 the form has a box for it. Much executive selling is planned and says more about diversifying than about the company.
- Holds after
- The shares the insider still held after the trade, in the form the trade was in (directly, or indirectly through a trust or a fund).
- Value
- Shares times the price the form reports, which is often an average over several fills on the day.
Read from the SEC's own quarterly data sets of Forms 3, 4 and 5, and from each day's filings since the last one. A correcting amendment replaces the lines it restates. Every row links to its filing. None of this is advice: insiders sell for many reasons, and buy for fewer.