Cellectar Biosciences, Inc. (CLRB) director John Neis reports stock sale

Rhea-AI Filing Summary

Cellectar Biosciences director John Neis reported selling 198 shares of the company’s common stock on December 12, 2025 at a weighted average price of $3.6969 per share. The shares were sold in multiple trades at prices ranging from $3.631 to $3.70.

Following this transaction, he is reported as beneficially owning 10 shares of common stock indirectly, held through Advantage Capital Wisconsin Partners I, Limited Partnership. The reported share amount reflects adjustments for prior reverse stock splits in 2018, 2022, and 2025.

Insider Trade Summary

Net Seller: 198 shares ($732)

Net Sell 1 txn

Insider NEIS JOHN

Role Director

Sold 198 shs ($731.99)

Type	Security	Shares	Price	Value
Sale	Common Stock	198	$3.6969	$731.99

Holdings After Transaction: Common Stock — 10 shares (Indirect, See Footnote)

Footnotes (1)

1. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.631 to $3.70, inclusive. The reporting person has provided to the Issuer, and undertakes to provide to any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in Footnote (1) to this Form 4. This number has been adjusted for (i) the one-for-thirty (1:30) reverse stock split effected by the Issuer on June 24, 2025, (ii) the one-for-ten (1:10) reverse stock split effected by the Issuer on July 21, 2022, and (iii) the one-for-ten (1:10) reverse stock split effected by the Issuer on July 16, 2018. These securities are held by Advantage Capital Wisconsin Partners I, Limited Partnership. Venture Investors LLC is the submanager and special limited partner of Advantage Capital Wisconsin Partners I, Limited Partnership. The investment decisions of Venture Investors LLC are made collectively by five managers, including the reporting person. The reporting person disclaims beneficial ownership of such securities except to the extent of his pecuniary interest herein.

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

NEIS JOHN

(Last) (First) (Middle)

C/O CELLECTAR BIOSCIENCES, INC.

100 CAMPUS DRIVE

(Street)

FLORHAM PARK NJ 07932

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Cellectar Biosciences, Inc. [ CLRB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
12/12/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	12/12/2025		S		198	D	$3.6969(1)	10(2)	I	See Footnote(3)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.631 to $3.70, inclusive. The reporting person has provided to the Issuer, and undertakes to provide to any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in Footnote (1) to this Form 4.

2. This number has been adjusted for (i) the one-for-thirty (1:30) reverse stock split effected by the Issuer on June 24, 2025, (ii) the one-for-ten (1:10) reverse stock split effected by the Issuer on July 21, 2022, and (iii) the one-for-ten (1:10) reverse stock split effected by the Issuer on July 16, 2018.

3. These securities are held by Advantage Capital Wisconsin Partners I, Limited Partnership. Venture Investors LLC is the submanager and special limited partner of Advantage Capital Wisconsin Partners I, Limited Partnership. The investment decisions of Venture Investors LLC are made collectively by five managers, including the reporting person. The reporting person disclaims beneficial ownership of such securities except to the extent of his pecuniary interest herein.

	/s/ Christina Blakley, attorney-in-fact for John Neis	12/16/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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