FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

FINKELSTEIN J J
2. Issuer Name and Ticker or Trading Symbol

REGENERX BIOPHARMACEUTICALS INC [ RGRX ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__X__ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
President and CEO
(Last)          (First)          (Middle)

C/O REGENERX BIOPHARMACEUTICALS, INC., 15245 SHADY GROVE ROAD, SUITE 470
3. Date of Earliest Transaction (MM/DD/YYYY)

8/2/2021
(Street)

ROCKVILLE, MD 20850
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
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. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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         1712991 D  

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
6. Date Exercisable and Expiration Date7. 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 of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Option (right to buy) $0.36            (1)6/30/2022 Common Stock 500000  500000 D  
Stock Option (right to buy) $0.64            (1)3/16/2023 Common Stock 200000  200000 D  
Stock Option (right to buy) $0.28            (1)9/1/2027 Common Stock 150000  150000 D  
Stock Option (right to buy) $0.21            (1)7/17/2028 Common Stock 250000  250000 D  
Stock Option (right to buy) $0.21            (2)5/15/2029 Common Stock 650000  650000 D  
Stock Option (right to buy) $0.30            (3)6/10/2030 Common Stock 500000  500000 D  
Convertible Promissory Note (right to buy) $0.12           2/27/2019 2/27/2024 Common Stock 104167  $12500.00 D  
Convertible Promissory Note (right to buy) $0.12           5/13/2019 5/13/2024 Common Stock 104167  $12500.00 D  
Convertible Promissory Note (right to buy) $0.36           10/15/2020 10/15/2025 Common Stock 27840  $10000 D  
Common Stock Warrant (right to buy) $0.18           8/27/2019 2/27/2024 Common Stock 78125  78125 D  
Common Stock Warrant (right to buy) $0.18           11/13/2019 5/13/2024 Common Stock 78125  78125 D  
Common Stock Warrant (right to buy) $0.45           4/15/2021 10/15/2025 Common Stock 20880  20880 D  
Series A Common Stock Warrant (right to buy) $0.24           6/30/2021 6/30/2023 Common Stock 56250  56250 D  
Series B Common Stock Warrant (right to buy) $0.28           6/30/2021 6/30/2026 Common Stock 56250  56250 D  
Stock Option (right to buy) $0.28 8/2/2021  A   600000     (4)8/2/2031 Common Stock 600000 $0 600000 D  

Explanation of Responses:
(1) 100% vested.
(2) 162,500 shares vest on each of 5/15/19, 5/15/20, 5/15/21 and 5/15/22.
(3) 125,000 shares vest on each of 6/10/20, 6/10/21, 6/10/22 and 6/10/23.
(4) 150,000 shares vest on each of 8/2/21, 8/2/22, 8/2/23 and 8/2/24.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
FINKELSTEIN J J
C/O REGENERX BIOPHARMACEUTICALS, INC.
15245 SHADY GROVE ROAD, SUITE 470
ROCKVILLE, MD 20850
X
President and CEO

Signatures
/s/ Andrew Nick as Attorney-in-Fact for J.J. Finkelstein pursuant to Power of Attorney previously filed.8/4/2021
**Signature of Reporting PersonDate

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