Ellen B Richstone

Insider

First SEC filing: July 1, 2025 · Latest: July 1, 2025

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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.

Insider at

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 14 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

14 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Aug. 11, 2026	OESX	A	2,532	—	—	35,897 Direct	+7.59%	Acquired	(price as of 2026-08-20)
June 17, 2026	CGTX	A	25,000	—	—	83,500 Direct	+42.74%	Acquired	(price as of 2026-08-20)
July 1, 2025	OESX	A	20,000	—	—	333,658 Direct	+6.38%	Acquired	(price as of 2026-08-20)
June 18, 2025	CGTX	A	34,000	—	—	58,500 Direct	+138.78%	Acquired	(price as of 2026-08-20)
Feb. 21, 2025	OESX	P	20,000	$0.91	$18,200	313,658 Direct	+6.81%	Acquired	100.3% (price as of 2026-08-20)
Feb. 20, 2025	OESX	P	874	$0.88	$769	293,658 Direct	+0.30%	Acquired	107.2% (price as of 2026-08-20)
Feb. 19, 2025	OESX	P	13,000	$0.84	$10,920	292,784 Direct	+4.65%	Acquired	117.0% (price as of 2026-08-20)
Feb. 18, 2025	OESX	P	13,000	$0.84	$10,920	279,784 Direct	+4.87%	Acquired	117.0% (price as of 2026-08-20)
Feb. 14, 2025	OESX	P	10,000	$0.82	$8,200	266,784 Direct	+3.89%	Acquired	122.3% (price as of 2026-08-20)
June 14, 2024	OESX	P	20,000	$1.14	$22,800	256,784 Direct	+8.45%	Acquired	59.9% (price as of 2026-08-20)
June 11, 2024	OESX	A	27,523	—	—	236,784 Direct	+13.15%	Acquired	(price as of 2026-08-20)
June 7, 2024	CGTX	A	8,500	—	—	8,500 Direct	—	Acquired	(price as of 2026-08-20)
June 7, 2024	CGTX	A	8,500	—	—	24,500 Direct	+53.12%	Acquired	(price as of 2026-08-20)
Nov. 29, 2023	OESX	P	30,000	$0.93	$27,900	209,261 Direct	+16.74%	Acquired	96.0% (price as of 2026-08-20)
Aug. 15, 2023	OESX	A	19,355	—	—	179,261 Direct	+12.10%	Acquired	(price as of 2026-08-20)
June 12, 2023	OESX	P	8,185	$1.85	$15,142	159,906 Direct	+5.39%	Acquired	-1.5% (price as of 2026-08-20)
June 9, 2023	CGTX	A	6,000	—	—	6,000 Direct	—	Acquired	(price as of 2026-08-20)
June 9, 2023	CGTX	A	6,000	—	—	16,000 Direct	+60.00%	Acquired	(price as of 2026-08-20)
June 9, 2023	OESX	P	16,815	$1.78	$29,931	151,721 Direct	+12.46%	Acquired	2.4% (price as of 2026-08-20)
Nov. 29, 2022	CGTX	P	10,000	$2.66	$26,600	10,000 Direct	—	Acquired	-63.6% (price as of 2026-08-20)
June 10, 2022	CGTX	A	8,335	—	—	8,335 Direct	—	Acquired	(price as of 2026-08-20)
June 10, 2022	CGTX	A	8,335	—	—	8,335 Direct	—	Acquired	(price as of 2026-08-20)
June 12, 2018	OESX	P	5,000	$0.97	$4,850	83,098 Direct	+6.40%	Acquired	87.9% (price as of 2026-08-20)
June 12, 2018	OESX	P	5,000	$0.96	$4,800	78,098 Direct	+6.84%	Acquired	89.9% (price as of 2026-08-20)
June 7, 2018	OESX	A	20,250	—	—	73,098 Direct	+38.32%	Acquired	(price as of 2026-08-20)
Feb. 26, 2018	OESX	P	23,500	$0.86	$20,210	52,848 Direct	+80.07%	Acquired	112.0% (price as of 2026-08-20)
June 13, 2017	OESX	A	29,348	—	—	29,348 Direct	—	Acquired	(price as of 2026-08-20)

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
June 7, 2024	CGTX	Stock Option (right to buy)	Common Stock (8,500)	$1.95	June 7, 2034	8,500	Acquired
June 9, 2023	CGTX	Stock Option (right to Buy)	Common Stock (6,000)	$2.77	June 9, 2033	6,000	Acquired
June 10, 2022	CGTX	Stock Option (Right to Buy)	Common Stock (8,335)	—	June 10, 2032	8,335	Acquired
June 10, 2022	CGTX	Stock Option (right to buy)	Common Stock (8,335)	$1.98	June 10, 2032	8,335	Acquired

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