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 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

(Print or Type Responses)
1. Name and Address of Reporting Person *
Ribeill Yves J
  2. Issuer Name and Ticker or Trading Symbol
Calyxt, Inc. [CLXT]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
2800 MOUNT RIDGE ROAD
3. Date of Earliest Transaction (Month/Day/Year)
03/11/2019
(Street)

ROSEVILLE, MN 55113
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
Restricted Stock Units (1) 03/11/2019   S   5,000 D $ 17.3915 (2) 55,000 D  
Restricted Stock Units (1) 03/12/2019   S   5,000 D $ 16.7638 (3) 50,000 D  
Restricted Stock Units (1) 03/13/2019   S   5,000 D $ 16.082 (4) 45,000 D  
Restricted Stock Units (1) 03/14/2019   S   4,980 D $ 16.3288 (5) 40,020 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
Stock Option (Right to Buy) $ 17.1               (6) 08/21/2028 Common Stock 180,000   180,000 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Ribeill Yves J
2800 MOUNT RIDGE ROAD
ROSEVILLE, MN 55113
  X      

Signatures

 /s/ Dr. Andre Choulika, as Attorney-in-Fact for Dr. Yves J. Ribeill   03/15/2019
**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) The award of restricted stock units with respect to Calyxt, Inc. common stock was granted on August 21, 2018 and vested 33.3% on October 10, 2018, with 33.3% vesting on October 10, 2019, and 33.4% vesting on October 10, 2020.
(2) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.665 to $17.79, inclusive. The reporting person undertakes to provide Calyxt, Inc., any security holder of Calyxt, Inc., or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2) to this Form 4.
(3) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.19 to $16.99, inclusive. The reporting person undertakes to provide Calyxt, Inc., any security holder of Calyxt, Inc., or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (3) to this Form 4.
(4) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.76 to $16.365, inclusive. The reporting person undertakes to provide Calyxt, Inc., any security holder of Calyxt, Inc., or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (4) to this Form 4.
(5) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.82 to $16.85, inclusive. The reporting person undertakes to provide Calyxt, Inc., any security holder of Calyxt, Inc., or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (5) to this Form 4.
(6) The award of stock options with respect to Calyxt, Inc. common stock, which was previously reported on a Form 4, was granted on August 21, 2018. The vesting schedule with respect to such stock options was subsequently accelerated such that 33.3% of the stock options vested on October 10, 2018, with 33.3% vesting on October 10, 2019 and 33.4% vesting on October 10, 2020.

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.