Dennis E. Marshall

CIK: 0001361115

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)0 (0.0%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)18 (100.0%)

Compensation grants

Other (G, F, J, C, D, …)0 (0.0%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

BLGO

BIOLARGO, INC.

Director

Discretionary Trading P&L

Holdings

Transaction History (18 total)

BLGO
BIOLARGO, INC.
Sep 30, 2026
Award(A)
Option to Purchase Common Stock
Direct
234.4K shares-
BLGO
BIOLARGO, INC.
Sep 30, 2026
Award(A)
Option to Purchase Common Stock
Direct
281.2K shares-
BLGO
BIOLARGO, INC.
Jun 30, 2026
Award(A)
Option to Purchase Common Stock
Direct
198.2K shares-
BLGO
BIOLARGO, INC.
Jun 30, 2026
Award(A)
Option to Purchase Common Stock
Direct
115.7K shares-
BLGO
BIOLARGO, INC.
Jun 22, 2026
Award(A)
Option to Purchase Common Stock
Direct
40.9K shares-
BLGO
BIOLARGO, INC.
Mar 31, 2026
Award(A)
Option to Purchase Common Stock
Direct
138.9K shares-
BLGO
BIOLARGO, INC.
Mar 31, 2026
Award(A)
Option to Purchase Common Stock
Direct
115.7K shares-
BLGO
BIOLARGO, INC.
Dec 31, 2025
Award(A)
Option to Purchase Common Stock
Direct
122.1K shares-
BLGO
BIOLARGO, INC.
Dec 31, 2025
Award(A)
Option to Purchase Common Stock
Direct
101.7K shares-
BLGO
BIOLARGO, INC.
Sep 30, 2025
Award(A)
Option to Purchase Common Stock
Direct
132.4K shares-
BLGO
BIOLARGO, INC.
Sep 30, 2025
Award(A)
Option to Purchase Common Stock
Direct
110.3K shares-
BLGO
BIOLARGO, INC.
Jun 30, 2025
Award(A)
Option to Purchase Common Stock
Direct
19K shares-
BLGO
BIOLARGO, INC.
Jun 30, 2025
Award(A)
Option to Purchase Common Stock
Direct
93.8K shares-
BLGO
BIOLARGO, INC.
Jun 30, 2025
Award(A)
Option to Purchase Common Stock
Direct
112.5K shares-
BLGO
BIOLARGO, INC.
Dec 31, 2024
Award(A)
Option to Purchase Common Stock
Direct
98.7K shares-
BLGO
BIOLARGO, INC.
Dec 26, 2024
Award(A)
Option to Purchase Common Stock
Direct
118.4K shares-
BLGO
BIOLARGO, INC.
Sep 30, 2024
Award(A)
Option to Purchase Common Stock
Direct
81.5K shares-
BLGO
BIOLARGO, INC.
Sep 29, 2024
Award(A)
Option to Purchase Common Stock
Direct
93.7K shares-

		Type	Shares	Price		Ownership
Sep 30, 2026	BLGO BIOLARGO, INC.	Award(A) Option to Purchase Common Stock	234,375	-	-	Direct
Sep 30, 2026	BLGO BIOLARGO, INC.	Award(A) Option to Purchase Common Stock	281,248	-	-	Direct
Jun 30, 2026	BLGO BIOLARGO, INC.	Award(A) Option to Purchase Common Stock	198,238	-	-	Direct
Jun 30, 2026	BLGO BIOLARGO, INC.	Award(A) Option to Purchase Common Stock	115,741	-	-	Direct
Jun 22, 2026	BLGO BIOLARGO, INC.	Award(A) Option to Purchase Common Stock	40,909	-	-	Direct
Mar 31, 2026	BLGO BIOLARGO, INC.	Award(A) Option to Purchase Common Stock	138,889	-	-	Direct
Mar 31, 2026	BLGO BIOLARGO, INC.	Award(A) Option to Purchase Common Stock	115,741	-	-	Direct
Dec 31, 2025	BLGO BIOLARGO, INC.	Award(A) Option to Purchase Common Stock	122,084	-	-	Direct
Dec 31, 2025	BLGO BIOLARGO, INC.	Award(A) Option to Purchase Common Stock	101,736	-	-	Direct
Sep 30, 2025	BLGO BIOLARGO, INC.	Award(A) Option to Purchase Common Stock	132,351	-	-	Direct
Sep 30, 2025	BLGO BIOLARGO, INC.	Award(A) Option to Purchase Common Stock	110,294	-	-	Direct
Jun 30, 2025	BLGO BIOLARGO, INC.	Award(A) Option to Purchase Common Stock	19,000	-	-	Direct
Jun 30, 2025	BLGO BIOLARGO, INC.	Award(A) Option to Purchase Common Stock	93,750	-	-	Direct
Jun 30, 2025	BLGO BIOLARGO, INC.	Award(A) Option to Purchase Common Stock	112,501	-	-	Direct
Dec 31, 2024	BLGO BIOLARGO, INC.	Award(A) Option to Purchase Common Stock	98,684	-	-	Direct
Dec 26, 2024	BLGO BIOLARGO, INC.	Award(A) Option to Purchase Common Stock	118,422	-	-	Direct
Sep 30, 2024	BLGO BIOLARGO, INC.	Award(A) Option to Purchase Common Stock	81,522	-	-	Direct
Sep 29, 2024	BLGO BIOLARGO, INC.	Award(A) Option to Purchase Common Stock	93,749	-	-	Direct

1-18 of 18 transactions

About Marshall Dennis E

Marshall Dennis E (SEC CIK 0001361115) files insider reports with the SEC as Director of BIOLARGO, INC. (BLGO).

Signal8 holds 10 ownership filings by Marshall Dennis E, all Form 4s, filed between Oct 1, 2024 and Oct 2, 2026. Those filings report 18 transactions, from Sep 29, 2024 to Sep 30, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Marshall Dennis E's filings is in WESTMINSTER, CA.

Recent filings by Marshall Dennis E

Sep 30, 2026: Grants or awards of BLGO derivative securities (2 lines, Form 4, code A).
Jun 30, 2026: Grants or awards of BLGO derivative securities (2 lines, Form 4, code A).
Jun 22, 2026: Grant or award of BLGO derivative securities (Form 4, code A).
Mar 31, 2026: Grants or awards of BLGO derivative securities (2 lines, Form 4, code A).
Dec 31, 2025: Grants or awards of BLGO derivative securities (2 lines, Form 4, code A).

Other insiders filing for BIOLARGO, INC. (BLGO)

CODE KENNETH REAY, Chief Science Officer
CALVERT DENNIS P, President
STROMMEN JACK B., Director
Bray Christina Elaine, Director
Park Linda, Director
DARGAN CHARLES K, Chief Financial Officer

How to read Form 4 transaction codes