Joseph H. Griffith IV

CIK: 0001431531

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)11 (50.0%)

Position reduction

Option Exercises (M)7 (31.8%)

Derivative conversions

Awards (A)4 (18.2%)

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)

MASS

908 Devices Inc.

Officer

Discretionary Trading P&L

Holdings

Transaction History (22 total)

MASS
908 Devices Inc.
Oct 6, 2026
Sale(S)
Direct
5K shares at avg. $13.03$65K
MASS
908 Devices Inc.
Aug 25, 2026
Sale(S)
Direct
11.5K shares at avg. $10.95$125K
MASS
908 Devices Inc.
May 28, 2026
Sale(S)
Direct
6.9K shares at avg. $9.03$63K
MASS
908 Devices Inc.
Feb 2, 2026
Sale(S)
Direct
23.2K shares at avg. $6.18$143K
MASS
908 Devices Inc.
Feb 2, 2026
Award(A)
Stock Option (option to buy)
Direct
53K shares-
MASS
908 Devices Inc.
Feb 2, 2026
Award(A)
Restricted Stock Units
Direct
121.2K shares-
MASS
908 Devices Inc.
Feb 1, 2026
Exercise(M)
Direct
5.1K shares-
MASS
908 Devices Inc.
Feb 1, 2026
Exercise(M)
Direct
10.3K shares-
MASS
908 Devices Inc.
Feb 1, 2026
Exercise(M)
Direct
11.3K shares-
MASS
908 Devices Inc.
Feb 1, 2026
Exercise(M)
Direct
43.5K shares-
MASS
908 Devices Inc.
Oct 3, 2025
Sale(S)
Direct
4.3K shares at avg. $9.05$39K
MASS
908 Devices Inc.
Oct 2, 2025
Sale(S)
Direct
708 shares at avg. $9.04$6K
MASS
908 Devices Inc.
Sep 19, 2025
Sale(S)
Direct
5K shares at avg. $7.07$35K
MASS
908 Devices Inc.
Jun 4, 2025
Sale(S)
Direct
6.9K shares at avg. $7.08$49K
MASS
908 Devices Inc.
Mar 3, 2025
Award(A)
Restricted Stock Units
Direct
130.4K shares-
MASS
908 Devices Inc.
Mar 3, 2025
Award(A)
Stock Option (option to buy)
Direct
59.4K shares-
MASS
908 Devices Inc.
Feb 3, 2025
Sale(S)
Direct
4.3K shares at avg. $2.35$10K
MASS
908 Devices Inc.
Feb 3, 2025
Sale(S)
Direct
2K shares at avg. $2.34$5K
MASS
908 Devices Inc.
Feb 3, 2025
Sale(S)
Direct
4K shares at avg. $2.33$9K
MASS
908 Devices Inc.
Feb 1, 2025
Exercise(M)
Direct
11.3K shares-
MASS
908 Devices Inc.
Feb 1, 2025
Exercise(M)
Direct
5.1K shares-
MASS
908 Devices Inc.
Feb 1, 2025
Exercise(M)
Direct
10.3K shares-

		Type	Shares	Price		Ownership
Oct 6, 2026	MASS 908 Devices Inc.	Sale(S)	5,000	$13.03	$65,150	Direct
Aug 25, 2026	MASS 908 Devices Inc.	Sale(S)	11,459	$10.95	$125,476	Direct
May 28, 2026	MASS 908 Devices Inc.	Sale(S)	6,940	$9.03	$62,668	Direct
Feb 2, 2026	MASS 908 Devices Inc.	Sale(S)	23,175	$6.18	$143,222	Direct
Feb 2, 2026	MASS 908 Devices Inc.	Award(A) Stock Option (option to buy)	52,967	-	-	Direct
Feb 2, 2026	MASS 908 Devices Inc.	Award(A) Restricted Stock Units	121,164	-	-	Direct
Feb 1, 2026	MASS 908 Devices Inc.	Exercise(M)	5,102	-	$0	Direct
Feb 1, 2026	MASS 908 Devices Inc.	Exercise(M)	10,306	-	$0	Direct
Feb 1, 2026	MASS 908 Devices Inc.	Exercise(M)	11,260	-	$0	Direct
Feb 1, 2026	MASS 908 Devices Inc.	Exercise(M)	43,473	-	$0	Direct
Oct 3, 2025	MASS 908 Devices Inc.	Sale(S)	4,292	$9.05	$38,849	Direct
Oct 2, 2025	MASS 908 Devices Inc.	Sale(S)	708	$9.04	$6,398	Direct
Sep 19, 2025	MASS 908 Devices Inc.	Sale(S)	5,000	$7.07	$35,339	Direct
Jun 4, 2025	MASS 908 Devices Inc.	Sale(S)	6,940	$7.08	$49,135	Direct
Mar 3, 2025	MASS 908 Devices Inc.	Award(A) Restricted Stock Units	130,418	-	-	Direct
Mar 3, 2025	MASS 908 Devices Inc.	Award(A) Stock Option (option to buy)	59,362	-	-	Direct
Feb 3, 2025	MASS 908 Devices Inc.	Sale(S)	4,321	$2.35	$10,167	Direct
Feb 3, 2025	MASS 908 Devices Inc.	Sale(S)	1,960	$2.34	$4,582	Direct
Feb 3, 2025	MASS 908 Devices Inc.	Sale(S)	3,955	$2.33	$9,235	Direct
Feb 1, 2025	MASS 908 Devices Inc.	Exercise(M)	11,261	-	-	Direct
Feb 1, 2025	MASS 908 Devices Inc.	Exercise(M)	5,102	-	-	Direct
Feb 1, 2025	MASS 908 Devices Inc.	Exercise(M)	10,306	-	-	Direct

1-22 of 22 transactions

About Griffith Joseph H. IV

Griffith Joseph H. IV (SEC CIK 0001431531) files insider reports with the SEC as Chief Financial Officer of 908 Devices Inc. (MASS).

Signal8 holds 9 ownership filings by Griffith Joseph H. IV, all Form 4s, filed between Feb 4, 2025 and Oct 8, 2026. Those filings report 22 transactions, from Feb 1, 2025 to Oct 6, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Griffith Joseph H. IV's filings is in BURLINGTON, MA.

Recent filings by Griffith Joseph H. IV

Oct 6, 2026: Open-market sale of MASS shares (Form 4, code S).
Aug 25, 2026: Open-market sale of MASS shares (Form 4, code S).
May 28, 2026: Open-market sale of MASS shares (Form 4, code S).
Feb 2, 2026: Open-market sale of MASS shares (Form 4, code S).
Feb 2, 2026: Grants or awards of MASS derivative securities (2 lines, Form 4, code A).

Other insiders filing for 908 Devices Inc. (MASS)

Brown Christopher D., Director
AWM Investment Company, Inc., 10% Owner
Kenneweg John, SVP, Sales & Product Marketing
Knopp Kevin J., President and CEO
Vann Brandi C, Director
Leonhart Michele M., Director

How to read Form 4 transaction codes