Walter S Woltosz

Insider

First SEC filing: May 1, 2026 · Latest: May 1, 2026

On this page

Insider at Companies where this person is a reporting insider.
Insider transactions Every share this person bought or sold, from Form 4 filings.
Derivatives Options and other derivative holdings reported by this person.
Compensation Executive pay disclosed in company proxy statements.

Insider at

SLP selling Feb. 27, 2018

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 32 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

32 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
May 1, 2026	SLP	A	2,117	—	—	3,282,800 Direct	+0.06%	Acquired	(price as of 2026-08-21)
Dec. 18, 2025	SLP	G	9,095	—	—	3,278,907 Direct	-0.28%	Disposed	(price as of 2026-08-21)
Nov. 2, 2020	SLP	A	255	$64.82	$16,529	4,707,614 Direct	+0.01%	Acquired	-71.6% (price as of 2026-08-21)
Aug. 3, 2020	SLP	A	206	$72.09	$14,851	4,779,309 Direct	0.00%	Acquired	-74.5% (price as of 2026-08-21)
July 17, 2020	SLP	A	5,000	$61.84	$309,200	36,400 Direct	+15.92%	Acquired	-70.3% (price as of 2026-08-21)
May 1, 2020	SLP	A	381	$38.05	$14,497	4,851,153 Direct	+0.01%	Acquired	-51.7% (price as of 2026-08-21)
Nov. 1, 2019	SLP	A	409	$35.41	$14,483	5,064,327 Direct	+0.01%	Acquired	-48.1% (price as of 2026-08-21)
Aug. 2, 2019	SLP	A	335	$38.82	$13,005	5,135,918 Direct	+0.01%	Acquired	-52.6% (price as of 2026-08-21)
July 19, 2019	SLP	A	5,000	$34.23	$171,150	31,400 Direct	+18.94%	Acquired	-46.3% (price as of 2026-08-21)
May 1, 2019	SLP	A	544	$22.53	$12,256	5,196,583 Direct	+0.01%	Acquired	-18.4% (price as of 2026-08-21)
May 1, 2019	SLP	A	544	$22.53	$12,256	5,159,583 Direct	+0.01%	Acquired	-18.4% (price as of 2026-08-21)
Nov. 1, 2018	SLP	A	404	$20.21	$8,165	5,399,812 Direct	+0.01%	Acquired	-9.0% (price as of 2026-08-21)
Feb. 27, 2018	SLP	S 10b5-1	18,500	$16.13	$298,405	5,482,916 Direct	-0.34%	Disposed	14.0% (price as of 2026-08-21)
Jan. 24, 2018	SLP	M	17,500	$5.61	$98,175	5,519,916 Direct	+0.32%	Acquired	227.9% (price as of 2026-08-21)
Nov. 29, 2017	SLP	S 10b5-1	18,500	$15.78	$291,930	5,610,916 Direct	-0.33%	Disposed	16.6% (price as of 2026-08-21)
Nov. 28, 2017	SLP	G	90,000	$15.90	$1,431,000	5,520,916 Direct	-1.60%	Disposed	15.7% (price as of 2026-08-21)
Nov. 16, 2017	SLP	A	12,000	—	—	104,000 Direct	+13.04%	Acquired	(price as of 2026-08-21)
Aug. 28, 2017	SLP	D	18,500	$14.15	$261,775	5,666,416 Direct	-0.33%	Disposed	30.0% (price as of 2026-08-21)
July 27, 2017	SLP	S	18,500	$15.07	$278,795	5,684,916 Direct	-0.32%	Disposed	22.1% (price as of 2026-08-21)
May 4, 2017	SLP	S	24,596	$12.52	$307,942	5,837,940 Direct	-0.42%	Disposed	46.9% (price as of 2026-08-21)
Nov. 17, 2016	SLP	G	115,000	$10.55	$1,213,250	5,747,536 Direct	-1.96%	Disposed	74.4% (price as of 2026-08-21)
Nov. 16, 2016	SLP	A	12,000	$10.01	$120,120	5,862,536 Direct	+0.21%	Acquired	83.8% (price as of 2026-08-21)
Jan. 29, 2016	SLP	S	58,181	$11.27	$655,700	5,895,721 Direct	-0.98%	Disposed	63.2% (price as of 2026-08-21)
Jan. 21, 2016	SLP	D	32,076	$11.21	$359,572	5,953,902 Direct	-0.54%	Disposed	64.1% (price as of 2026-08-21)
Dec. 2, 2015	SLP	A	12,000	$8.93	$107,160	98,000 Direct	+13.95%	Acquired	106.0% (price as of 2026-08-21)
Dec. 3, 2014	SLP	A	20,000	$7.10	$142,000	5,985,978 Direct	+0.34%	Acquired	159.1% (price as of 2026-08-21)
Dec. 20, 2012	SLP	X	128,000	$1.98	$253,440	112,000 Direct	-53.33%	Disposed	829.0% (price as of 2026-08-21)
Dec. 20, 2012	SLP	A	68,503	$4.26	$291,823	6,277,909 Direct	+1.10%	Acquired	331.8% (price as of 2026-08-21)
Sept. 10, 2012	SLP	G	20,000	$5.06	$101,200	240,000 Direct	+9.09%	Acquired	263.5% (price as of 2026-08-21)
Dec. 19, 2011	SLP	A	100,000	—	—	220,000 Direct	+83.33%	Acquired	(price as of 2026-08-21)
July 20, 2011	SLP	X	30,000	$1.24	$37,200	120,000 Direct	-20.00%	Disposed	1383.5% (price as of 2026-08-21)
July 20, 2011	SLP	M	18,063	$1.24	$22,398	6,538,856 Direct	+0.28%	Acquired	1383.5% (price as of 2026-08-21)
Nov. 30, 2010	SLP	A	20,000	$3.27	$65,400	180,000 Direct	+12.50%	Acquired	462.5% (price as of 2026-08-21)
Nov. 30, 2010	SLP	J	102,666	$1.62	$166,319	160,000 Direct	-39.09%	Disposed	1035.5% (price as of 2026-08-21)
July 20, 2006	SLP	A	7,500	$4.95	$37,125	7,500 Direct	—	Acquired	1386.5% (price as of 2026-08-21)
July 20, 2006	SLP	P	7,500	$4.50	$33,750	7,500 Direct	—	Acquired	1535.1% (price as of 2026-08-21)
May 3, 2006	SLP	J	25,000	$1.54	$38,500	7,500 Direct	-76.92%	Disposed	4677.9% (price as of 2026-08-21)
Dec. 30, 2005	SLP	G	16,000	$5.18	$82,880	2,001,000 Direct	-0.79%	Disposed	1320.5% (price as of 2026-08-21)

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II)

Options, RSUs and convertible securities reported on Form 4 Table II.

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
July 17, 2020	SLP	Options for Simulations Plus, Inc. common stock	Simulations Plus, Inc. common stock (5,000)	$61.84	July 17, 2030	5,000	Acquired
July 19, 2019	SLP	Options for Simulations Plus, Inc. common stock	Simulations Plus, Inc. common stock (5,000)	$34.23	July 19, 2029	5,000	Acquired
Nov. 16, 2017	SLP	Options for Simulations Plus, Inc. common stock [F1]	Simulations Plus, Inc. (SLP) common stock (12,000)	$17.71	Nov. 15, 2022	12,000	Acquired
Dec. 2, 2015	SLP	Stock options for Simulations Plus, Inc. common stock	Simulations Plus, Inc. common stock (12,000)	$9.82	Nov. 30, 2020	12,000	Acquired
Dec. 20, 2012	SLP	Employee stock options for Simulations Plus common stock	Employee stock options for Simulations Plus common stock (128,000)	—	Dec. 16, 2014	128,000	Disposed
Sept. 10, 2012	SLP	Options for common stock	Oprions for Simulations Plus, Inc. common stock (20,000)	$5.06	Sept. 10, 2015	20,000	Acquired
Dec. 19, 2011	SLP	Stock options	Common (100,000)	—	Dec. 19, 2016	100,000	Acquired
July 20, 2011	SLP	Stock Option	SLP Common Stock (30,000)	$1.24	July 20, 2011	30,000	Disposed
Nov. 30, 2010	SLP	Stock option	Common (20,000)	$3.27	Nov. 30, 2015	20,000	Acquired
Nov. 30, 2010	SLP	Stock option	Common (102,666)	$1.62	Dec. 16, 2014	102,666	Disposed
July 20, 2006	SLP	Stock Option [F1]	Common (7,500)	—	July 20, 2011	7,500	Acquired
July 20, 2006	SLP	Simulations Plus, Inc.	Simulations Plus, Inc. (7,500)	$4.50	July 20, 2011	7,500	Acquired
May 3, 2006	SLP	Stock Option	Common (25,000)	$1.54	May 3, 2006	25,000	Disposed

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Compensation (DEF 14A)

Matched by name from proxy statements (DEF 14A) — verify against the filing.

SLP

Fiscal year	Salary	Bonus	Stock awards	Option awards	Non-equity incentive	Pension change	Other	Total
2018	$199,010	$36,000	—	$42,597	—	—	$0	$277,607
2017	$180,000	$36	—	$29,227	—	—	$6,300	$251,527
2016	$180,000	$36,000	—	$34,612	—	—	$7,200	$257,812

Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.