Sec Form 4 Filing - Nitta Michael S @ CASTLE GROUP INC - 2018-06-28

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 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: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person Nitta Michael S 2. Issuer Name and Ticker or Trading Symbol CASTLE GROUP INC [ CAGU] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Financial Officer (Last) (First) (Middle) 590C PAIEA ST 3. Date of Earliest Transaction (MM/DD/YY) 06/28/2018 (Street) HONOLULU, HI96819 4. If Amendment, Date Original Filed (MM/DD/YY) 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 05/24/2009 S 5,000 ( 1 ) D $ 0.37 0 I By daughter Nicolle Common Stock 05/24/2009 P 5,000 ( 1 ) A $ 0.37 160,200 D Common Stock 05/15/2014 P 6,700 A $ 0.37 166,900 D Common Stock 08/21/2014 P 5,000 A $ 0.22 171,900 D Common Stock 08/05/2015 P 5,000 A $ 0.31 176,900 D Common Stock 06/14/2018 P 4,200 A $ 0.25 181,100 D

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 Warrant $ 1 12/16/2016 12/15/2021 Common Stock 50,000 50,000 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Nitta Michael S 590C PAIEA ST HONOLULU, HI96819 Chief Financial Officer Signatures /s/ Michael S. Nitta 06/29/2018 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Transferred shares from his daughter. Ownership went from indirect to direct.

Remarks: Reporting person resigned as Chief Financial Officer of The Castle Group on December 31, 2007, and ceased to be a reporting person. At a meeting of the board of directors on June 28, 2018, Mr. Nitta was appointed Chief Financial Officer of the company. Transactions reported above occurred between the dates of December 31, 2007 and June 28, 2018.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* 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).

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