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

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OMB Number:

3235-0287

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(Print or Type Responses)

1. Name and Address of Reporting Person ^*

COOPER JEFFREY

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

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

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

(Last)

(First)

(Middle)

1500 W UNIVERSITY PARKWAY

3. Date of Earliest Transaction (Month/Day/Year)
07/08/2005

(Street)

SARASOTA, FL 34243

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)
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	07/08/2005		S⁽¹⁾		150 ⁽²⁾	D	$ 27.0133 ⁽²⁾	49,423 ⁽³⁾	D
Common Stock	07/08/2005		S⁽¹⁾		300 ⁽²⁾	D	$ 26.7467 ⁽²⁾	49,123	D
Common Stock	07/08/2005		S⁽¹⁾		148.50 ⁽²⁾	D	$ 26.7533 ⁽²⁾	48,974.50	D
Common Stock	07/08/2005		S⁽¹⁾		300 ⁽²⁾	D	$ 26.76 ⁽²⁾	48,674.50	D
Common Stock	07/08/2005		S⁽¹⁾		1,128 ⁽²⁾	D	$ 26.8133 ⁽²⁾	47,546.50	D
Common Stock	07/08/2005		S⁽¹⁾		150 ⁽²⁾	D	$ 26.82 ⁽²⁾	47,396.50	D
Common Stock	07/08/2005		S⁽¹⁾		150 ⁽²⁾	D	$ 26.8333 ⁽²⁾	47,246.50	D
Common Stock	07/08/2005		S⁽¹⁾		150 ⁽²⁾	D	$ 26.84 ⁽²⁾	47,096.50	D
Common Stock	07/08/2005		S⁽¹⁾		2,400 ⁽²⁾	D	$ 26.8667 ⁽²⁾	44,696.50	D
Common Stock	07/08/2005		S⁽¹⁾		300 ⁽²⁾	D	$ 26.88 ⁽²⁾	44,396.50	D
Common Stock	07/08/2005		S⁽¹⁾		300 ⁽²⁾	D	$ 26.9267 ⁽²⁾	44,096.50	D
Common Stock	07/08/2005		S⁽¹⁾		375 ⁽²⁾	D	$ 26.9333 ⁽²⁾	43,721.50	D
Common Stock	07/08/2005		S⁽¹⁾		300 ⁽²⁾	D	$ 26.94 ⁽²⁾	43,421.50	D
Common Stock	07/08/2005		S⁽¹⁾		3 ⁽²⁾	D	$ 26.9467 ⁽²⁾	43,418.50	D
Common Stock	07/08/2005		S⁽¹⁾		297 ⁽²⁾	D	$ 26.9533 ⁽²⁾	43,121.50	D
Common Stock	07/08/2005		S⁽¹⁾		148.50 ⁽²⁾	D	$ 26.96 ⁽²⁾	42,973	D
Common Stock	07/08/2005		S⁽¹⁾		150 ⁽²⁾	D	$ 26.9933 ⁽²⁾	42,823	D
Common Stock	07/08/2005		S⁽¹⁾		450 ⁽²⁾	D	$ 27.0067 ⁽²⁾	42,373	D
Common Stock	07/08/2005		S⁽¹⁾		300 ⁽²⁾	D	$ 27.0667 ⁽²⁾	42,073	D
Common Stock								1,285.50 ⁽⁴⁾	I ⁽⁵⁾	BY ESOP TRUST

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
COOPER JEFFREY 1500 W UNIVERSITY PARKWAY SARASOTA, FL 34243			Engineering Manager

Signatures

Paul R. Lynch, as Attorney-in-Fact for JEFFREY COOPER		07/11/2005
^**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 sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 29, 2005.
(2)	Price and number of shares have been adjusted for 1 for 2 common stock dividend declared in June 2005, payable on July 15, 2005, to shareholders of record on June 30, 2005.
(3)	Includes 16,524 additional shares received as a result of the 1 for 2 common stock dividend declared in June 2005.
(4)	Includes 428.5 additional shares received as a result of the 1 for 2 common stock dividend declared in June 2005.
(5)	Reflects allocations of shares under the Sun Hydraulics Corporation Employee Stock Ownership Plan.

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.