Ownership Submission
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

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Expires: January 31, 2005
Estimated average burden hours per response... 0.5

(Print or Type Responses)
1. Name and Address of Reporting Person *
ARMSTRONG JR. JOHN L.
   2. Issuer Name and Ticker or Trading Symbol
CorMedix Inc. [CRMD] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
Exec VP of Tech Operations
(Last)
(First)
(Middle)
C/O CORMEDIX INC., 1430 U.S. HIGHWAY 206, SUITE 200		 3. Date of Earliest Transaction (Month/Day/Year)
12/31/2017
(Street)

BEDMINSTER, NJ 07921		 4. If Amendment, Date 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
(City)
(State)
(Zip)
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 12/31/2017 12/31/2017 M   18,028 A $ 0 (1) 38,861 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number. SEC 1474 (9-02)

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 Underlying Securities
(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)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Restricted Stock Units $ 0 12/31/2017 12/31/2017 M     18,028   (1) 02/28/2027 Common Stock 18,028 $ 0 18,029 D  
Stock Option (Right to Buy Common Stock) $ 0.57               (2) 02/16/2028 Common Stock 45,000   45,000 D  
Stock Option (Right to Buy Common Stock) $ 2.18               (3) 03/01/2025 Common Stock 100,000   100,000 D  
Stock Option (Right to Buy Common Stock) $ 1.52               (4) 11/14/2024 Common Stock 10,000   10,000 D  
Stock Option (Right to Buy Common Stock) $ 3.25               (5) 07/28/2025 Common Stock 15,000   15,000 D  
Stock Option (Right to Buy Common Stock) $ 2.51               (6) 03/08/2026 Common Stock 200,000   200,000 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
ARMSTRONG JR. JOHN L.
C/O CORMEDIX INC.
1430 U.S. HIGHWAY 206, SUITE 200
BEDMINSTER, NJ 07921		       Exec VP of Tech Operations  

Signatures

 /s/ Alexander M. Donaldson, by power of attorney   03/22/2018
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Each restricted stock unit represents the right to receive one share of CorMedix Inc. common stock. The restricted stock units vested 50% on December 31, 2017 and 50% will vest on December 31, 2018, subject to continued employment.
(2) The options vest 25% on the date of grant (2/16/2018), and 25% on the first, second and third anniversaries of the date of grant, subject to Optionee's continued service through such date.
(3) The option vests based on certain performance milestones. The option will be forfeited if such milestones are not met by certain dates.
(4) These options vested upon the achievement of certain milestones, subject to continued employment.
(5) One third of these options vested upon the achievement of a certain milestone and one third vested on each of December 31, 2015 and July 28, 2015.
(6) 15,000 of these options vest monthly over four years, beginning on March 9, 2016, 20,000 vest upon the achievement of a certain milestone, subject to continued employment, and the rest vested upon the achievement of certain milestones.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.