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
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Jensen Glenn
   2. Issuer Name and Ticker or Trading Symbol
CYANOTECH CORP [CYAN] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
VP of Manufacturing
(Last)
(First)
(Middle)
73-4460 QUEEN KAAHUMANU HWY #102		 3. Date of Earliest Transaction (Month/Day/Year)
04/05/2018
(Street)

KAILUA-KONA, HI 96740		 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
Cyanotech common stock 04/05/2018   M   167 A $ 0 12,500 D  
Cyanotech common stock 04/05/2018   F(1)   63 D $ 5.25 12,437 D  
Cyanotech common stock               375 I By Spouse

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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
Cyanotech common stock options $ 2.08               (2) 04/30/2019 Cyanotech common stock 10,000   10,000 D  
Cyanotech common stock options $ 3.58               (3) 06/30/2021 Cyanotech common stock 8,000   8,000 D  
Cyanotech common stock options $ 3.82               (4) 08/28/2021 Cyanotech common stock 2,000   2,000 D  
Cyanotech common stock options $ 3.82               (5) 08/28/2021 Cyanotech common stock 35,000   35,000 D  
Cyanotech common stock options $ 5.84               (6) 07/18/2022 Cyanotech common stock 10,000   10,000 D  
Restricted stock units (7) 04/05/2018   M     167   (8)   (8) Cyanotech common stock 167 $ 0 333 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Jensen Glenn
73-4460 QUEEN KAAHUMANU HWY #102
KAILUA-KONA, HI 96740		       VP of Manufacturing  

Signatures

 /s/ Dan Sprague, by Power of Attorney   04/09/2018
**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) The reporting person is reporting the withholding by the Issuer of 63 shares of common stock that vested on April 5, 2018 pursuant to the April 5, 2017 RSU grant, but that were not issued in order to satisfy the reporting person's tax withholding obligations in connection with the delivery of the converted common stock to the reporting person as of April 6, 2018.
(2) Mr Jensen acquired 10,000 stock options on 4/30/2009, of which 1,000 options became exercisable on 4/30/2010, 2,000 options became exercisable on 4/30/2011, 3,000 options became exercisable on 4/30/2012 and 4,000 options became exercisable on 4/30/2013.
(3) Mr Jensen acquired 8,000 stock options on 7/1/2011, of which 800 options became exercisable on 7/1/2011, 1,600 options became exercisable on 7/1/2012, 2,400 options became exercisable on 7/1/2013 and 3,200 options became exercisable on 7/1/2014.
(4) Mr Jensen acquired 2,000 stock options on 8/29/2011, of which 200 options became exercisable on 8/29/2011, 400 options became exercisable on 8/29/2012, 600 options became exercisable on 8/29/2013 and 800 options became exercisable on 8/29/2014.
(5) Mr Jensen acquired 35,000 stock options on 8/29/2011, of which 7,000 options became exercisable on 8/29/2012, 7,000 options became exercisable on 8/29/2013, 7,000 options became exercisable on 8/29/2014, 7,000 options became exercisable on 8/29/2015 and 7,000 options became exercisable on 8/29/2016.
(6) Mr Jensen acquired 10,000 stock options on 7/19/2012, of which 2,500 options became exercisable on 7/19/2013, 2,500 options became exercisable on 7/19/2014, 2,500 options became exercisable on 7/19/2015 and 2,500 options became exercisable on 7/19/2016.
(7) Each restricted stock unit represents the contingent right to receive one (1) share of Cyanotech common stock.
(8) The restricted stock units shall vest as to 167 shares on 4/5/2019 and 166 shares on 4/5/2020, in each case subject to continued service with Cyanotech on the vesting date.

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