Mark C Williamson

Insider

First SEC filing: Aug. 26, 2010 · Latest: Aug. 26, 2010

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Insider at

0 buys (P) 0 sells (S) Net: $0 + 10 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

10 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
June 8, 2018	OESX	P	9,000	$0.88	$7,920	113,805 Direct	+8.59%	Acquired	119.1% (price as of 2026-08-19)
June 7, 2018	OESX	A	20,250	—	—	104,805 Direct	+23.95%	Acquired	(price as of 2026-08-19)
June 13, 2017	OESX	A	17,609	—	—	84,555 Direct	+26.30%	Acquired	(price as of 2026-08-19)
Aug. 5, 2016	OESX	A	19,014	—	—	66,946 Direct	+39.67%	Acquired	(price as of 2026-08-19)
May 26, 2015	OESX	A	12,217	—	—	47,932 Direct	+34.21%	Acquired	(price as of 2026-08-19)
May 16, 2014	OESX	P	5,000	$4.22	$21,100	35,715 Direct	+16.28%	Acquired	-54.3% (price as of 2026-08-19)
May 15, 2014	OESX	A	10,715	—	—	30,715 Direct	+53.57%	Acquired	(price as of 2026-08-19)
May 28, 2013	OESX	A	36,568	—	—	36,568 Direct	—	Acquired	(price as of 2026-08-19)
Nov. 13, 2012	OESX	P	10,000	$1.65	$16,500	20,000 Direct	+100.00%	Acquired	16.9% (price as of 2026-08-19)
June 12, 2012	OESX	A	26,646	—	—	26,646 Direct	—	Acquired	(price as of 2026-08-19)
May 23, 2011	OESX	A	22,045	—	—	22,045 Direct	—	Acquired	(price as of 2026-08-19)
Aug. 26, 2010	OESX	P	10,000	$2.21	$22,100	10,000 Direct	—	Acquired	-12.8% (price as of 2026-08-19)
May 18, 2010	OESX	A	19,912	—	—	19,912 Direct	—	Acquired	(price as of 2026-08-19)
May 19, 2009	OESX	A	10,583	—	—	10,583 Direct	—	Acquired	(price as of 2026-08-19)

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.

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

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
May 28, 2013	OESX	Stock Options (right to buy)	Common Stock (36,568)	$2.41	May 28, 2023	36,568	Acquired
June 12, 2012	OESX	Stock Options (right to buy)	Common Stock (26,646)	$2.03	June 12, 2022	26,646	Acquired
May 23, 2011	OESX	Stock Options (right to buy)	Common Stock (22,045)	$4.19	May 23, 2021	22,045	Acquired
May 18, 2010	OESX	Stock Options (right to buy)	Common Stock (19,912)	$3.46	May 18, 2020	19,912	Acquired
May 19, 2009	OESX	Stock Options (right to buy)	Common Stock (10,583)	$3.78	May 19, 2019	10,583	Acquired

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