CHANG DAVID C

Director at AXT INC · on record since Mar 10, 2006
Director at FEDDERS CORP /DE · on record since Jun 22, 2006
Director at SPECTRUM MANAGEMENT HOLDING COMPANY, LLC · on record since Feb 13, 2007
VP Global Sales & Marketing at AXT INC · on record since Nov 24, 2010

Insider trading activity of CHANG DAVID C

Transactions on record: 84; since Aug 12, 2003

Open-market buys: 8; $63.7K

Open-market sells: 12; $5.8M

Companies traded: 3; last filing Jun 17, 2026

Figures computed from official regulatory filings — .

Companies where CHANG DAVID C has traded

AXT INC43 tx · $6M · Jun 17, 2026
SPECTRUM MANAGEMENT HOLDING COMPANY, LLC36 tx · $70K · May 20, 2016
FEDDERS CORP /DE5 tx · $72K · Jun 22, 2006

Track record of CHANG DAVID C

Statistical track record

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Open-market buys: 8

Last buy: Aug 31, 2010

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Transaction history of CHANG DAVID C

Co-insiders of CHANG DAVID C

This page republishes public regulatory disclosures.

Company	Filed	Type	Qty	Price	Value · USD	Signals	Src
AXT INCListing on record	Jun 17, 2026	Sell	-8,333	111.17 USD	$926.4K		SEC
AXT INCListing on record	Jun 5, 2026	Award	754	—	n/a (No price was disclosed in the filing)		SEC
AXT INCListing on record	Mar 12, 2026	Sell	-20,000	46.00 USD	$920K		SEC
AXT INCListing on record	Mar 5, 2026	Sell	-20,000	38.42 USD	$768.4K		SEC
AXT INCListing on record	Mar 5, 2026	Sell	-20,000	38.53 USD	$770.6K		SEC
AXT INCListing on record	Dec 10, 2025	Sell	-25,000	14.84 USD	$371K		SEC
AXT INCListing on record	Dec 2, 2025	Sell	-25,000	10.72 USD	$268K		SEC
AXT INCListing on record	Dec 2, 2025	Sell	-25,000	12.33 USD	$308.3K		SEC
AXT INCListing on record	Nov 6, 2025	Sell	-100,000	8.94 USD	$894K	Unusual size	SEC
AXT INCListing on record	May 16, 2025	Award	55,172	—	n/a (No price was disclosed in the filing)		SEC
AXT INCListing on record	May 20, 2024	Award	23,323	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
AXT INCListing on record	May 19, 2023	Award	23,323	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
AXT INCListing on record	May 23, 2022	Award	15,238	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
AXT INCListing on record	May 24, 2021	Award	6,726	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
AXT INCListing on record	Jun 1, 2020	Sell	-12,800	5.48 USD	$70.1K		SEC
AXT INCListing on record	May 22, 2020	Award	10,909	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
AXT INCListing on record	May 24, 2019	Award	13,452	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
AXT INCListing on record	May 24, 2018	Award	7,594	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
AXT INCListing on record	Aug 2, 2017	Sell	-9,000	8.80 USD	$79.2K		SEC
AXT INCListing on record	May 31, 2016	Award	16,260	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
SPECTRUM MANAGEMENT HOLDING COMPANY, LLCListing unverified	May 20, 2016	Other	-4,678	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
SPECTRUM MANAGEMENT HOLDING COMPANY, LLCListing unverified	May 20, 2016	OtherD (derivative)	-17,533.54	—	n/a (No price was disclosed in the filing)		SEC
SPECTRUM MANAGEMENT HOLDING COMPANY, LLCListing unverified	May 20, 2016	OtherD (derivative)	-5,507.36	—	n/a (No price was disclosed in the filing)		SEC
SPECTRUM MANAGEMENT HOLDING COMPANY, LLCListing unverified	Feb 11, 2016	AwardD (derivative)	830	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
SPECTRUM MANAGEMENT HOLDING COMPANY, LLCListing unverified	Jan 11, 2016	Exercise	603	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC

Company	Filed	Type	Qty	Price	Value · USD	Signals	Src
AXT INCListing on record	Jun 17, 2026	Sell	-8,333	111.17 USD	$926.4K		SEC
AXT INCListing on record	Jun 5, 2026	Award	754	—	n/a (No price was disclosed in the filing)		SEC
AXT INCListing on record	Mar 12, 2026	Sell	-20,000	46.00 USD	$920K		SEC
AXT INCListing on record	Mar 5, 2026	Sell	-20,000	38.42 USD	$768.4K		SEC
AXT INCListing on record	Mar 5, 2026	Sell	-20,000	38.53 USD	$770.6K		SEC
AXT INCListing on record	Dec 10, 2025	Sell	-25,000	14.84 USD	$371K		SEC
AXT INCListing on record	Dec 2, 2025	Sell	-25,000	10.72 USD	$268K		SEC
AXT INCListing on record	Dec 2, 2025	Sell	-25,000	12.33 USD	$308.3K		SEC
AXT INCListing on record	Nov 6, 2025	Sell	-100,000	8.94 USD	$894K	Unusual size	SEC
AXT INCListing on record	May 16, 2025	Award	55,172	—	n/a (No price was disclosed in the filing)		SEC
AXT INCListing on record	May 20, 2024	Award	23,323	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
AXT INCListing on record	May 19, 2023	Award	23,323	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
AXT INCListing on record	May 23, 2022	Award	15,238	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
AXT INCListing on record	May 24, 2021	Award	6,726	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
AXT INCListing on record	Jun 1, 2020	Sell	-12,800	5.48 USD	$70.1K		SEC
AXT INCListing on record	May 22, 2020	Award	10,909	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
AXT INCListing on record	May 24, 2019	Award	13,452	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
AXT INCListing on record	May 24, 2018	Award	7,594	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
AXT INCListing on record	Aug 2, 2017	Sell	-9,000	8.80 USD	$79.2K		SEC
AXT INCListing on record	May 31, 2016	Award	16,260	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
SPECTRUM MANAGEMENT HOLDING COMPANY, LLCListing unverified	May 20, 2016	Other	-4,678	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
SPECTRUM MANAGEMENT HOLDING COMPANY, LLCListing unverified	May 20, 2016	OtherD (derivative)	-17,533.54	—	n/a (No price was disclosed in the filing)		SEC
SPECTRUM MANAGEMENT HOLDING COMPANY, LLCListing unverified	May 20, 2016	OtherD (derivative)	-5,507.36	—	n/a (No price was disclosed in the filing)		SEC
SPECTRUM MANAGEMENT HOLDING COMPANY, LLCListing unverified	Feb 11, 2016	AwardD (derivative)	830	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
SPECTRUM MANAGEMENT HOLDING COMPANY, LLCListing unverified	Jan 11, 2016	Exercise	603	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC