FORM 4
[ X ] 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
                                                                                  
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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(f) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

JOCHUM PETER DR 		2. Issuer Name and Ticker or Trading Symbol

DIONEX CORP /DE [ DNEX ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
Vice President
(Last)          (First)          (Middle)

1228 TITAN WAY 		3. Date of Earliest Transaction (MM/DD/YYYY)

5/17/2011
(Street)

SUNNYVALE, CA 94085
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 7. Title and Amount of Securities Underlying Derivative Security
(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
Nonqualified Stock Option   $47.19   (2) 5/17/2011     D   (1)       5000      (2) 5/17/2011   (2) Common Stock   5000     (2) 80719   D    
Nonqualified Stock Option   $48.05   (2) 5/17/2011     D   (1)       16000      (2) 5/17/2011   (2) Common Stock   16000     (2) 64719   D    
Nonqualified Stock Option   $53.38   (2) 5/17/2011     D   (1)       15000      (2) 5/17/2011   (2) Common Stock   15000     (2) 49719   D    
Nonqualified Stock Option   $72.56   (2) 5/17/2011     D   (1)       15000      (2) 5/17/2011   (2) Common Stock   15000     (2) 34719   D    
Nonqualified Stock Option   $74.47   (2) 5/17/2011     D   (1)       8000      (2) 5/17/2011   (2) Common Stock   8000     (2) 26719   D    
Nonqualified Stock Option   $64.71   (2) 5/17/2011     D   (1)       10000      (2) 5/17/2011   (2) Common Stock   10000     (2) 16719   D    
Nonqualified Stock Option   $76.30   (2) 5/17/2011     D   (1)       9775      (2) 5/17/2011   (2) Common Stock   9775     (3) 6944   D    
Restricted Stock Unit   $0   (3) 5/17/2011     D   (1)       2000      (3) 5/17/2011   Common Stock   2000     (3) 4944   D    
Restricted Stock Unit   $0   (3) 5/17/2011     D   (1)       2500      (3) 5/17/2011   Common Stock   2500     (3) 2444   D    
Restricted Stock Unit   $0   (3) 5/17/2011     D   (1)       1222      (3) 5/17/2011   Common Stock   1222     (3) 1222   D    
Performance Restricted Stock Unit   $0   (3) 5/17/2011     D         1222      (3) 5/17/2011   Common Stock   1222     (3) 0   D    

Explanation of Responses:
( 1)  Disposed of pursuant to the Agreement and Plan of Merger dated December 12, 2010 by and among the Issuer, Thermo Fisher Scientific, Inc. and Weston D Merger Co.
( 2)  Pursuant to the Merger Agreement, this option was cancelled in exchange for a cash payment equal to the product of (i) the number of the Issuer's common stock subject to the option multiplied by (ii) the excess of $118.50 over the per share exercise price of the option.
( 3)  Restricted Stock Units do not have an exercise price so this column is not applicable. Each restricted stock unit represents the right to receive one share of common stock which was disposed of pursuant to the Merger Agreement for $118.50 per share.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
JOCHUM PETER DR
1228 TITAN WAY
SUNNYVALE, CA 94085

Vice President

Signatures
/s/ Craig A. McCollam for Peter Jochum 5/18/2011
** Signature of Reporting Person Date


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 control number.
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