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 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 ^*

KOSKI CHRISTINE L

2. Issuer Name and Ticker or Trading Symbol
SUN HYDRAULICS CORP [SNHY]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

__X__ Director	__X__ 10% Owner
_____ Officer (give title below)	_____ Other (specify below)

(Last)

(First)

(Middle)

1500 WEST UNIVERSITY PARKWAY

3. Date of Earliest Transaction (Month/Day/Year)
09/20/2018

(Street)

SARASOTA, FL 34243

4. If Amendment, Date Original Filed(Month/Day/Year)

6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ 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)
1.Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	09/20/2018		S⁽¹⁾		13,130	D	$ 56.1294 ⁽²⁾	140,702	D ⁽³⁾
Common Stock	09/20/2018		S⁽¹⁾		5,970	D	$ 56.9154 ⁽⁴⁾	134,732	D ⁽³⁾
Common Stock	09/21/2018		S⁽¹⁾		5,900	D	$ 57.5412 ⁽⁵⁾	128,832	D ⁽³⁾
Common Stock	09/21/2018		S⁽¹⁾		4,580	D	$ 58.0342 ⁽⁶⁾	124,252	D ⁽³⁾
Common Stock								1,640,493	D ⁽⁷⁾
Common Stock								412,719	D ⁽⁸⁾
Common Stock								160,000	I ⁽⁹⁾	BY WIFE
Common Stock								320,111.427	D ⁽¹⁰⁾
Common Stock								19,000	I ⁽¹¹⁾	BY KOSKI MANAGEMENT, INC.
Common Stock								60,000	D ⁽¹²⁾

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

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
KOSKI CHRISTINE L 1500 WEST UNIVERSITY PARKWAY SARASOTA, FL 34243	X	X
KOSKI BEVERLY		X
KOSKI FAMILY LP		X
KOSKI THOMAS L		X
KOSKI ROBERT C		X

Signatures

Gregory C. Yadley, as Attorney-in-Fact for CHRISTINE L. KOSKI, BEVERLY KOSKI, KOSKI FAMILY LIMITED PARTNERSHIP, ROBERT C. KOSKI AND THOMAS L. KOSKI		09/24/2018
^**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)	Sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 30, 2018.
(2)	The range of prices for the transactions reported is $55.51 - $56.5050. The undersigned hereby undertakes to provide upon request by the Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
(3)	Shares owned directly by Christine L. Koski.
(4)	The range of prices for the transactions reported is $56.51 - $57.40. The undersigned hereby undertakes to provide upon request by the Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
(5)	The range of prices for the transactions reported is $57.00 - $57.76. The undersigned hereby undertakes to provide upon request by the Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
(6)	The range of prices for the transactions reported is $58.00 - $58.11. The undersigned hereby undertakes to provide upon request by the Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
(7)	Shares owned directly by Koski Family Limited Partnership. Shares owned indirectly by Beverly Koski, Christine L. Koski, Robert C. Koski and Thomas L. Koski, each of whom is a general partner of the partnership or the controlling person of a corporate general partner of the partnership.
(8)	Shares owned directly by Thomas L. Koski.
(9)	Shares owned indirectly by Thomas L. Koski.
(10)	Shares owned directly by Beverly Koski.
(11)	Shares owned indirectly by Beverly Koski.
(12)	Shares owned directly by Robert C. Koski.

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.