Simulations Plus, Inc. (SLP) Insider Trading

Last 12 months

Insiders sold $491k and bought nothing on the open market.

All of the selling was scheduled in advance under 10b5-1 plans. The last open-market buy by an executive or director was in May 2009.

Net open-market

−$491k

0 buys · 10 sales

Under a 10b5-1 plan

100%

of the value sold

Insiders who bought / sold

0 / 4

executives and directors

Last open-market buy

May 2009

May 15, 2009

Get an email when SLP's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Aug 3	John Anthony Dibella II Chief Revenue Officer	Sold10b5-1 plan	1,000	$18.28	$18k	1.2%	Form 4
Jul 6	John Anthony Dibella II Chief Revenue Officer	Sold10b5-1 plan	1,000	$18.36	$18k	1.1%	Form 4
Jul 1	Virginia E Woltosz Large holder	Sold10b5-1 plan	4,177	$18.44	$77k	0.1%	Form 4
Jun 16	Jill Fiedler-Kelly President, Services Solutions	Sold10b5-1 plan	7,350	$18.20	$134k	8.6%	Form 4
Jun 15	Jill Fiedler-Kelly President, Services Solutions	Sold10b5-1 plan	1,050	$16.51	$17k	1.3%	Form 4
Jun 3	John Anthony Dibella II Chief Revenue Officer	Sold10b5-1 plan	1,000	$16.50	$17k	1.1%	Form 4
Jun 1	Virginia E Woltosz Large holder	Sold10b5-1 plan	15,000	$17.43	$261k	0.5%	Form 4
May 11	Jill Fiedler-Kelly President, Services Solutions	Sold10b5-1 plan	1,000	$16.53	$17k	1.3%	Form 4
May 4	John Anthony Dibella II Chief Revenue Officer	Sold10b5-1 plan	1,000	$14.98	$15k	1.1%	Form 4
May 4	Walter S Woltosz Director	Sold10b5-1 plan	15,000	$15.13	$227k	0.5%	Form 4
Apr 15	John Anthony Dibella II Chief Revenue Officer	Sold10b5-1 plan	1,000	$13.37	$13k	1.1%	Form 4
Dec 1, 2025	Lisa Lavange Director	Sold10b5-1 plan	866	$16.91	$15k	8.0%	Form 4
Oct 1, 2025	Virginia E Woltosz Large holder	Sold10b5-1 plan	20,000	$15.39	$308k	0.6%	Form 4
Sep 2, 2025	Lisa Lavange Director	Sold10b5-1 plan	867	$14.10	$12k	8.7%	Form 4
Aug 1, 2025	Lisa Lavange Director	Sold10b5-1 plan	867	$12.93	$11k	8.0%	Form 4
Jul 1, 2025	Walter S Woltosz Director	Sold10b5-1 plan 2 parts	20,000	$18.33 average	$367k	0.6%	Form 4
Jun 2, 2025	Virginia E Woltosz Large holder	Sold10b5-1 plan 5 parts	20,000	$27.15 average	$543k	0.6%	Form 4
May 1, 2025	Virginia E Woltosz Large holder	Sold10b5-1 plan 2 parts	20,000	$33.51 average	$670k	0.6%	Form 4
Apr 1, 2025	Walter S Woltosz Director	Sold10b5-1 plan 2 parts	20,000	$24.09 average	$482k	0.6%	Form 4
Mar 3, 2025	Virginia E Woltosz Large holder	Sold10b5-1 plan	20,000	$28.68	$574k	0.6%	Form 4
Feb 3, 2025	Walter S Woltosz Director	Sold10b5-1 plan 2 parts	20,000	$33.91 average	$678k	0.6%	Form 4
Jan 2, 2025	Virginia E Woltosz Large holder	Sold10b5-1 plan 2 parts	20,000	$27.88 average	$558k	0.6%	Form 4
Dec 27, 2024	Daniel L Weiner Director	Sold10b5-1 plan	750	$28.50	$21k	9.4%	Form 4
Dec 2, 2024	Virginia E Woltosz Large holder	Sold10b5-1 plan	20,000	$31.76	$635k	0.6%	Form 4
Dec 2, 2024	Lisa Lavange Director	Sold10b5-1 plan	650	$31.88	$21k	8.3%	Form 4
Nov 1, 2024	Virginia E Woltosz Large holder	Sold10b5-1 plan	20,000	$27.66	$553k	0.6%	Form 4

Aug 310b5-1 plan
John Anthony Dibella II
Chief Revenue Officer · sold 1,000 at $18.28
$18k
1.2% of stake
Jul 610b5-1 plan
John Anthony Dibella II
Chief Revenue Officer · sold 1,000 at $18.36
$18k
1.1% of stake
Jul 110b5-1 plan
Virginia E Woltosz
Large holder · sold 4,177 at $18.44
$77k
0.1% of stake
Jun 1610b5-1 plan
Jill Fiedler-Kelly
President, Services Solutions · sold 7,350 at $18.20
$134k
8.6% of stake
Jun 1510b5-1 plan
Jill Fiedler-Kelly
President, Services Solutions · sold 1,050 at $16.51
$17k
1.3% of stake
Jun 310b5-1 plan
John Anthony Dibella II
Chief Revenue Officer · sold 1,000 at $16.50
$17k
1.1% of stake
Jun 110b5-1 plan
Virginia E Woltosz
Large holder · sold 15,000 at $17.43
$261k
0.5% of stake
May 1110b5-1 plan
Jill Fiedler-Kelly
President, Services Solutions · sold 1,000 at $16.53
$17k
1.3% of stake
May 410b5-1 plan
John Anthony Dibella II
Chief Revenue Officer · sold 1,000 at $14.98
$15k
1.1% of stake
May 410b5-1 plan
Walter S Woltosz
Director · sold 15,000 at $15.13
$227k
0.5% of stake
Apr 1510b5-1 plan
John Anthony Dibella II
Chief Revenue Officer · sold 1,000 at $13.37
$13k
1.1% of stake
Dec 1, 202510b5-1 plan
Lisa Lavange
Director · sold 866 at $16.91
$15k
8.0% of stake
Oct 1, 202510b5-1 plan
Virginia E Woltosz
Large holder · sold 20,000 at $15.39
$308k
0.6% of stake
Sep 2, 202510b5-1 plan
Lisa Lavange
Director · sold 867 at $14.10
$12k
8.7% of stake
Aug 1, 202510b5-1 plan
Lisa Lavange
Director · sold 867 at $12.93
$11k
8.0% of stake
Jul 1, 202510b5-1 plan
Walter S Woltosz
Director · sold 20,000 at avg $18.33
$367k
0.6% of stake
Jun 2, 202510b5-1 plan
Virginia E Woltosz
Large holder · sold 20,000 at avg $27.15
$543k
0.6% of stake
May 1, 202510b5-1 plan
Virginia E Woltosz
Large holder · sold 20,000 at avg $33.51
$670k
0.6% of stake
Apr 1, 202510b5-1 plan
Walter S Woltosz
Director · sold 20,000 at avg $24.09
$482k
0.6% of stake
Mar 3, 202510b5-1 plan
Virginia E Woltosz
Large holder · sold 20,000 at $28.68
$574k
0.6% of stake
Feb 3, 202510b5-1 plan
Walter S Woltosz
Director · sold 20,000 at avg $33.91
$678k
0.6% of stake
Jan 2, 202510b5-1 plan
Virginia E Woltosz
Large holder · sold 20,000 at avg $27.88
$558k
0.6% of stake
Dec 27, 202410b5-1 plan
Daniel L Weiner
Director · sold 750 at $28.50
$21k
9.4% of stake
Dec 2, 202410b5-1 plan
Virginia E Woltosz
Large holder · sold 20,000 at $31.76
$635k
0.6% of stake
Dec 2, 202410b5-1 plan
Lisa Lavange
Director · sold 650 at $31.88
$21k
8.3% of stake
Nov 1, 202410b5-1 plan
Virginia E Woltosz
Large holder · sold 20,000 at $27.66
$553k
0.6% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch SLP, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Spot a number that looks wrong? Check it in SLP's SEC filings or

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Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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