Douglas J. Swirsky

CIK: 0001375884

Transaction Breakdown

Open Market Buys (P)1 (16.7%)

High conviction signal

Open Market Sales (S)2 (33.3%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)3 (50.0%)

Compensation grants

Other (G, F, J, C, D, …)0 (0.0%)

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

Companies & Roles (3)

CLRB

Cellectar Biosciences, Inc.

Director

BRNS

Barinthus Biotherapeutics plc.

Officer

MXCT

MAXCYTE, INC.

Officer

Discretionary Trading P&L

Holdings

Transaction History (6 total)

CLRB
Cellectar Biosciences, Inc.
Jul 7, 2026
Award(A)
Stock option (right to buy)
Direct
37.5K shares-
MXCT
MAXCYTE, INC.
Mar 17, 2026
Sale(S)
Direct
10.1K shares at avg. $0.81$8K
MXCT
MAXCYTE, INC.
Aug 13, 2025
Purchase(P)
Direct
50K shares at avg. $1.29$65K
MXCT
MAXCYTE, INC.
Mar 18, 2025
Sale(S)
Direct
6.9K shares at avg. $3.18$22K
MXCT
MAXCYTE, INC.
Mar 14, 2025
Award(A)
Direct
37.5K shares-
CLRB
Cellectar Biosciences, Inc.
Feb 14, 2025
Award(A)
Stock option (right to buy)
Direct
90K shares-

		Type	Shares	Price		Ownership
Jul 7, 2026	CLRB Cellectar Biosciences, Inc.	Award(A) Stock option (right to buy)	37,500	-	-	Direct
Mar 17, 2026	MXCT MAXCYTE, INC.	Sale(S)	10,142	$0.81	$8,266	Direct
Aug 13, 2025	MXCT MAXCYTE, INC.	Purchase(P)	50,000	$1.29	$64,500	Direct
Mar 18, 2025	MXCT MAXCYTE, INC.	Sale(S)	6,939	$3.18	$22,061	Direct
Mar 14, 2025	MXCT MAXCYTE, INC.	Award(A)	37,500	-	-	Direct
Feb 14, 2025	CLRB Cellectar Biosciences, Inc.	Award(A) Stock option (right to buy)	90,000	-	-	Direct

1-6 of 6 transactions

About Swirsky Douglas J

Swirsky Douglas J (SEC CIK 0001375884) files insider reports with the SEC as Director of Cellectar Biosciences, Inc. (CLRB), Principal Accounting Officer of Barinthus Biotherapeutics plc. (BRNS) and CHIEF FINANCIAL OFFICER of MAXCYTE, INC. (MXCT).

Signal8 holds 7 ownership filings by Swirsky Douglas J (1 Form 3, 6 Form 4), filed between Feb 18, 2025 and Jul 8, 2026. Those filings report 6 transactions, from Feb 14, 2025 to Jul 7, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Swirsky Douglas J's filings is in FLORHAM PARK, NJ.

Recent filings by Swirsky Douglas J

Jul 7, 2026: Grant or award of CLRB derivative securities (Form 4, code A).
Mar 17, 2026: Open-market sale of MXCT shares (Form 4, code S).
Aug 13, 2025: Open-market purchase of MXCT shares (Form 4, code P).
Mar 18, 2025: Open-market sale of MXCT shares (Form 4, code S).
Mar 14, 2025: Grant or award of MXCT shares (Form 4, code A).

Other insiders filing for Cellectar Biosciences, Inc. (CLRB)

Loren Stefan, Officer
Kolean Chad J, CFO
DRISCOLL FREDERICK W, Director
Chanan-Khan Asher, Director
CARUSO JAMES V, President & CEO
Gu Andrew, Director

How to read Form 4 transaction codes