Insider · CIK 0001789455

Custer Matthew Keith

Reports to the SEC for 1 company · KAILUA-KONA, HI

sec.gov

Transactions

Companies

Filings

CIK

0001789455

Forms 4 and 5

Insider transactions

42 trades

Date	Company	Role	Code	Shares	Price	Value	Shares after
2025-07-29	CYANCYANOTECH CORPM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	+2,075 sh	—	—	6,754
2025-07-29	CYANCYANOTECH CORP · Restricted Stock UnitsM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	−2,075 sh	—	—	64,137
2025-06-16	CYANCYANOTECH CORP · Cyanotech common stock optionsA Award	Director, President and CEO	AAward	+150K sh	—	—	150,000
2025-06-16	CYANCYANOTECH CORP · Restricted Stock UnitsA Award	Director, President and CEO	AAward	+64.1K sh	—	—	4,679
2025-04-07	CYANCYANOTECH CORPM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	+33 sh	—	—	4,679
2025-04-07	CYANCYANOTECH CORP · Restricted Stock UnitsM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	−33 sh	—	—	2,109
2024-07-29	CYANCYANOTECH CORPM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	+2,074 sh	—	—	5,425
2024-07-29	CYANCYANOTECH CORPF Tax Payment	Director, President and CEO	FTax Payment	−779 sh	$0.56	−$436.24	4,646
2024-07-29	CYANCYANOTECH CORP · Restricted Stock UnitsM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	−2,074 sh	—	—	2,142
2024-04-08	CYANCYANOTECH CORPM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	+33 sh	—	—	3,364
2024-04-08	CYANCYANOTECH CORPF Tax Payment	Director, President and CEO	FTax Payment	−13 sh	$0.40	−$5.2	3,351
2024-04-08	CYANCYANOTECH CORP · Restricted Stock UnitsM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	−33 sh	—	—	4,216
2023-07-31	CYANCYANOTECH CORPM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	+2,603 sh	—	—	4,309
2023-07-31	CYANCYANOTECH CORPF Tax Payment	Director, President and CEO	FTax Payment	−978 sh	$0.84	−$821.52	3,331
2023-07-31	CYANCYANOTECH CORP · Restricted Stock UnitsM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	−2,603 sh	—	—	4,249
2023-04-06	CYANCYANOTECH CORPM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	+34 sh	—	—	1,719
2023-04-06	CYANCYANOTECH CORPF Tax Payment	Director, President and CEO	FTax Payment	−13 sh	$0.94	−$12.22	1,706
2023-04-06	CYANCYANOTECH CORP · Restricted Stock UnitsA Award	Director, President and CEO	AAward	+100 sh	—	—	6,886
2023-04-06	CYANCYANOTECH CORP · Restricted Stock UnitsM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	−34 sh	—	—	6,852
2022-08-01	CYANCYANOTECH CORPM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	+529 sh	—	—	1,884
2022-08-01	CYANCYANOTECH CORPF Tax Payment	Director, President and CEO	FTax Payment	−199 sh	$3.15	−$626.85	1,685
2022-08-01	CYANCYANOTECH CORP · Restricted Stock UnitsM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	−529 sh	—	—	6,786
2022-07-29	CYANCYANOTECH CORP · Restricted Stock UnitsA Award	Director, President and CEO	AAward	+6,223 sh	—	—	7,315
2022-06-21	CYANCYANOTECH CORP · Cyanotech common stock optionsA Award	Director, President and CEO	AAward	+50K sh	—	—	50,000
2022-04-06	CYANCYANOTECH CORPM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	+33 sh	—	—	1,368
2022-04-06	CYANCYANOTECH CORPF Tax Payment	Director, President and CEO	FTax Payment	−13 sh	$3.03	−$39.39	1,355
2022-04-06	CYANCYANOTECH CORP · Restricted Stock UnitsM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	−33 sh	—	—	1,092
2021-07-30	CYANCYANOTECH CORPM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	+530 sh	—	—	1,335
2021-07-30	CYANCYANOTECH CORP · Restricted Stock UnitsM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	−530 sh	—	—	1,125
2021-07-13	CYANCYANOTECH CORPM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	+254 sh	—	—	805
2021-07-13	CYANCYANOTECH CORP · Restricted Stock UnitsM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	−254 sh	—	—	1,655
2021-05-20	CYANCYANOTECH CORP · Cyanotech common stock optionsA Award	Director, President and CEO	AAward	+50K sh	—	—	50,000
2021-04-06	CYANCYANOTECH CORPM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	+33 sh	—	—	551
2021-04-06	CYANCYANOTECH CORP · Restricted Stock UnitsM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	−33 sh	—	—	1,909
2020-07-30	CYANCYANOTECH CORP · Restricted Stock UnitsA Award	Director, President and CEO	AAward	+1,588 sh	—	—	1,942
2020-07-13	CYANCYANOTECH CORPM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	+254 sh	—	—	614
2020-07-13	CYANCYANOTECH CORPF Tax Payment	Director, President and CEO	FTax Payment	−96 sh	$2.25	−$216	518
2020-07-13	CYANCYANOTECH CORP · Restricted Stock UnitsM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	−254 sh	—	—	354
2020-07-07	CYANCYANOTECH CORP · Cyanotech common stock optionsA Award	Director, President and CEO	AAward	+50K sh	—	—	50,000
2020-04-06	CYANCYANOTECH CORPM Exercise/Conversion	Director, President and CEO	MExercise/Conversion	+40 sh	—	—	376
2020-04-06	CYANCYANOTECH CORPF Tax Payment	Director, President and CEO	FTax Payment	−16 sh	$2.07	−$33.12	360
2020-04-06	CYANCYANOTECH CORP · Restricted Stock UnitsA Award	Director, President and CEO	AAward	+100 sh	—	—	608

Recent filings

Accepted (ET)
Jul 314
Custer Matthew Keith0001437749-25-024127
SEC(opens sec.gov)
Jun 184
Custer Matthew Keith0001437749-25-020772
SEC(opens sec.gov)
Apr 94
Custer Matthew Keith0001437749-25-011515
SEC(opens sec.gov)
Jul 314
Custer Matthew Keith0001437749-24-024095
SEC(opens sec.gov)
Apr 104
Custer Matthew Keith0001437749-24-011676
SEC(opens sec.gov)
Aug 14
Custer Matthew Keith0001437749-23-021372
SEC(opens sec.gov)
Apr 104
Custer Matthew Keith0001437749-23-009813
SEC(opens sec.gov)
Aug 24
Custer Matthew Keith0001437749-22-018395
SEC(opens sec.gov)

Companies

CYANOTECH CORPDirector, President and CEOCYAN

Address

73-4460 QUEEN KAAHUMANU HWY #102

KAILUA-KONA, HI, 96740