Tengfei Zhang

Insider

First SEC filing: June 23, 2023 · Latest: June 23, 2023

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Insider at

0 buys (P) 0 sells (S) Net: $0 + 15 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

15 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
June 22, 2023	GURE	S	2,000	$2.51	$5,020	1,000 Direct	-66.67%	Disposed	-86.8% (price as of 2026-08-21)
Oct. 7, 2022	GURE	A	1,000	—	—	3,000 Direct	+50.00%	Acquired	(price as of 2026-08-21)
May 10, 2021	GURE	A	1,000	—	—	2,000 Direct	+100.00%	Acquired	(price as of 2026-08-21)
Sept. 21, 2020	GURE	A	1,000	—	—	1,000 Direct	—	Acquired	(price as of 2026-08-21)
May 17, 2019	GURE	M	12,500	—	—	12,500 Direct	-50.00%	Disposed	(price as of 2026-08-21)
May 17, 2019	GURE	F	5,195	$0.71	$3,688	5,195 Direct	—	Acquired	-90.7% (price as of 2026-08-21)
Dec. 3, 2018	GURE	A	12,500	—	—	37,500 Direct	+50.00%	Acquired	(price as of 2026-08-21)
July 1, 2015	GURE	A	12,500	—	—	25,000 Direct	+100.00%	Acquired	(price as of 2026-08-21)
June 9, 2015	GURE	F	12,500	—	—	12,500 Direct	-50.00%	Disposed	(price as of 2026-08-21)
June 9, 2015	GURE	F	12,500	—	—	25,000 Direct	-33.33%	Disposed	(price as of 2026-08-21)
June 9, 2015	GURE	C	6,142	$1.17	$7,186	12,012 Direct	+104.63%	Acquired	-94.3% (price as of 2026-08-21)
June 9, 2015	GURE	C	5,870	$1.22	$7,161	5,870 Direct	—	Acquired	-94.6% (price as of 2026-08-21)
June 30, 2014	GURE	A	12,500	—	—	37,500 Direct	+50.00%	Acquired	(price as of 2026-08-21)
July 2, 2013	GURE	A	12,500	—	—	37,500 Direct	+50.00%	Acquired	(price as of 2026-08-21)
July 2, 2012	GURE	A	12,500	—	—	25,000 Direct	+100.00%	Acquired	(price as of 2026-08-21)
June 30, 2011	GURE	A	12,500	—	—	12,500 Direct	—	Acquired	(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.

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

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
May 17, 2019	GURE	Common Stock, par value $0.0005 per share	Common Stock (12,500)	$0.71	Dec. 2, 2021	12,500	Disposed
Dec. 3, 2018	GURE	Common Stock, par value $0.0005 per share	Common Stock (12,500)	$0.71	Dec. 2, 2021	12,500	Acquired
July 1, 2015	GURE	Option to purchase Common Stock, par value $0.0005 per share	Common Stock (12,500)	$2.07	June 30, 2018	12,500	Acquired
June 9, 2015	GURE	Common Stock, par value $0.0005 per shar	Common Stock (12,500)	$1.17	July 1, 2016	12,500	Disposed
June 9, 2015	GURE	Common Stock, par value $0.0005 per share	Common Stock (12,500)	$1.22	July 1, 2015	12,500	Disposed
June 30, 2014	GURE	Option to purchase Common Stock, par value $0.0005 per share	Common Stock (12,500)	$2.15	May 29, 2017	12,500	Acquired
July 2, 2013	GURE	Option to purchase Common Stock, par value $0.0005 per share	Common Stock (12,500)	$1.17	July 1, 2016	12,500	Acquired
July 2, 2012	GURE	Option to purchase Common Stock, par value $0.0005 per share	Common Stock (12,500)	$1.22	July 1, 2015	12,500	Acquired
June 30, 2011	GURE	Option to purchase Common Stock, par value $0.0005 per share	Common Stock (12,500)	$3.22	June 29, 2014	12,500	Acquired

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