John Joseph Johnston

CIK: 0001874850

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)6 (37.5%)

Position reduction

Option Exercises (M)8 (50.0%)

Derivative conversions

Awards (A)2 (12.5%)

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)

MXCT

MAXCYTE, INC.

Director

Discretionary Trading P&L

Holdings

Transaction History (16 total)

MXCT
MAXCYTE, INC.
Jun 17, 2026
Award(A)
Direct
30.4K shares-
MXCT
MAXCYTE, INC.
Jun 18, 2025
Award(A)
Direct
29.2K shares-
MXCT
MAXCYTE, INC.
Jan 27, 2025
Sale(S)
Direct
3K shares at avg. $4.64$14K
MXCT
MAXCYTE, INC.
Jan 27, 2025
Exercise(M)
Direct
3K shares at avg. $2.93$9K
MXCT
MAXCYTE, INC.
Dec 26, 2024
Exercise(M)
Direct
3K shares at avg. $2.93$9K
MXCT
MAXCYTE, INC.
Dec 26, 2024
Sale(S)
Direct
3K shares at avg. $4.01$12K
MXCT
MAXCYTE, INC.
Dec 9, 2024
Exercise(M)
Direct
483 shares at avg. $2.93$1K
MXCT
MAXCYTE, INC.
Dec 9, 2024
Sale(S)
Direct
2.5K shares at avg. $3.79$9K
MXCT
MAXCYTE, INC.
Dec 9, 2024
Exercise(M)
Direct
891 shares at avg. $2.93$3K
MXCT
MAXCYTE, INC.
Dec 9, 2024
Exercise(M)
Direct
1.1K shares at avg. $1.64$2K
MXCT
MAXCYTE, INC.
Dec 6, 2024
Exercise(M)
Direct
505 shares at avg. $2.93$1K
MXCT
MAXCYTE, INC.
Dec 6, 2024
Sale(S)
Direct
505 shares at avg. $3.70$2K
MXCT
MAXCYTE, INC.
Oct 28, 2024
Exercise(M)
Direct
3K shares at avg. $2.93$9K
MXCT
MAXCYTE, INC.
Oct 28, 2024
Sale(S)
Direct
3K shares at avg. $3.72$11K
MXCT
MAXCYTE, INC.
Sep 26, 2024
Exercise(M)
Direct
3K shares at avg. $2.93$9K
MXCT
MAXCYTE, INC.
Sep 26, 2024
Sale(S)
Direct
3K shares at avg. $3.82$11K

		Type	Shares	Price		Ownership
Jun 17, 2026	MXCT MAXCYTE, INC.	Award(A)	30,421	-	$0	Direct
Jun 18, 2025	MXCT MAXCYTE, INC.	Award(A)	29,210	-	-	Direct
Jan 27, 2025	MXCT MAXCYTE, INC.	Sale(S)	3,000	$4.64	$13,935	Direct
Jan 27, 2025	MXCT MAXCYTE, INC.	Exercise(M)	3,000	$2.93	$8,796	Direct
Dec 26, 2024	MXCT MAXCYTE, INC.	Exercise(M)	3,000	$2.93	$8,796	Direct
Dec 26, 2024	MXCT MAXCYTE, INC.	Sale(S)	3,000	$4.01	$12,021	Direct
Dec 9, 2024	MXCT MAXCYTE, INC.	Exercise(M)	483	$2.93	$1,416	Direct
Dec 9, 2024	MXCT MAXCYTE, INC.	Sale(S)	2,495	$3.79	$9,459	Direct
Dec 9, 2024	MXCT MAXCYTE, INC.	Exercise(M)	891	$2.93	$2,607	Direct
Dec 9, 2024	MXCT MAXCYTE, INC.	Exercise(M)	1,121	$1.64	$1,840	Direct
Dec 6, 2024	MXCT MAXCYTE, INC.	Exercise(M)	505	$2.93	$1,478	Direct
Dec 6, 2024	MXCT MAXCYTE, INC.	Sale(S)	505	$3.70	$1,869	Direct
Oct 28, 2024	MXCT MAXCYTE, INC.	Exercise(M)	3,000	$2.93	$8,778	Direct
Oct 28, 2024	MXCT MAXCYTE, INC.	Sale(S)	3,000	$3.72	$11,166	Direct
Sep 26, 2024	MXCT MAXCYTE, INC.	Exercise(M)	3,000	$2.93	$8,778	Direct
Sep 26, 2024	MXCT MAXCYTE, INC.	Sale(S)	3,000	$3.82	$11,460	Direct

1-16 of 16 transactions

About Johnston John Joseph

Johnston John Joseph (SEC CIK 0001874850) files insider reports with the SEC as Director of MAXCYTE, INC. (MXCT).

Signal8 holds 7 ownership filings by Johnston John Joseph, all Form 4s, filed between Sep 30, 2024 and Jun 22, 2026. Those filings report 16 transactions, from Sep 26, 2024 to Jun 17, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Johnston John Joseph's filings is in ROCKVILLE, MD.

Recent filings by Johnston John Joseph

Jun 17, 2026: Grant or award of MXCT shares (Form 4, code A).
Jun 18, 2025: Grant or award of MXCT shares (Form 4, code A).
Jan 27, 2025: Open-market sale of MXCT shares (Form 4, code S).
Jan 27, 2025: Option exercise of MXCT shares (Form 4, code M).
Dec 26, 2024: Option exercise of MXCT shares (Form 4, code M).

Other insiders filing for MAXCYTE, INC. (MXCT)

Hemrajani Rekha, Director
Erck Stanley C, Director
DOUGLAS RICHARD, Director
Collins Cynthia, Director
Brooke William W, Director
BALTHROP PATRICK J, Director

How to read Form 4 transaction codes