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 *
BLAESER JOHN A
   2. Issuer Name and Ticker or Trading Symbol
CONCORD COMMUNICATIONS INC [CCRD] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
CEO & President
(Last)
(First)
(Middle)
C/O CONCORD COMMUNICATIONS, INC., 600 NICKERSON ROAD		 3. Date of Earliest Transaction (Month/Day/Year)
06/07/2005
(Street)

MARLBORO, MA 01752		 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
Common Stock 06/07/2005   D   165,295 D $ 17 (1) 0 D  

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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
Employee Stock Option (Right to Buy) $ 19 06/07/2005   D     11,735 06/07/2005(2) 10/29/2005 Common Stock 11,735 $ 0 (2) 0 D  
Employee Stock Option (Right to Buy) $ 19 06/07/2005   D     22,640 06/07/2005(3) 10/29/2005 Common Stock 22,640 $ 0 (3) 0 D  
Employee Stock Option (Right to Buy) $ 23.5 06/07/2005   D     4,255 06/07/2005(4) 04/29/2006 Common Stock 4,255 $ 0 (4) 0 D  
Employee Stock Option (Right to Buy) $ 23.5 06/07/2005   D     60,745 06/07/2005(5) 04/29/2006 Common Stock 60,745 $ 0 (5) 0 D  
Employee Stock Option (Right to Buy) $ 9.34 06/07/2005   D     3,569 06/07/2005(6) 07/18/2009 Common Stock 3,569 $ 0 (6) 0 D  
Employee Stock Option (Right to Buy) $ 9.34 06/07/2005   D     1,432 06/07/2005(7) 07/18/2009 Common Stock 1,432 $ 0 (7) 0 D  
Employee Stock Option (Right to Buy) $ 13.05 06/07/2005   D     9,375 06/07/2005(8) 11/14/2009 Common Stock 9,375 $ 0 (8) 0 D  
Employee Stock Option (Right to Buy) $ 9.01 06/07/2005   D     11,098 06/07/2005(9) 12/20/2010 Common Stock 11,098 $ 0 (9) 0 D  
Employee Stock Option (Right to Buy) $ 9.01 06/07/2005   D     32,652 06/07/2005(10) 12/20/2010 Common Stock 32,652 $ 0 (10) 0 D  
Employee Stock Option (Right to Buy) $ 14.65 06/07/2005   D     6,825 06/07/2005(11) 10/08/2011 Common Stock 6,825 $ 0 (11) 0 D  
Employee Stock Option (Right to Buy) $ 14.65 06/07/2005   D     43,175 06/07/2005(12) 10/08/2011 Common Stock 43,175 $ 0 (12) 0 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
BLAESER JOHN A
C/O CONCORD COMMUNICATIONS, INC.
600 NICKERSON ROAD
MARLBORO, MA 01752		   X     CEO & President  

Signatures

 /s/ Douglas A. Batt, Pursuant to a Power of Attorney   06/09/2005
**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) Disposed of pursuant to merger agreement between Concord Communications and Computer Associates in exchange for the right to receive $17.00 per share
(2) This option was assumed by Computer Associates in the merger and replaced with an option to purchase 7,340 shares of Computer Associates' common stock for $30.38 per share. In accordance with the Amendment and Restated Management Change in Control Agreement between Mr. Blaeser and Concord Communications, this option became fully vested upon the consumation of the merger
(3) This option was assumed by Computer Associates in the merger and replaced with an option to purchase 14,161 shares of Computer Associates' common stock for $30.38 per share. In accordance with the Amendment and Restated Management Change in Control Agreement between Mr. Blaeser and Concord Communications, this option became fully vested upon the consumation of the merger
(4) This option was assumed by Computer Associates in the merger and replaced with an option to purchase 2,661 shares of Computer Associates' common stock for $37.57 per share. In accordance with the Amendment and Restated Management Change in Control Agreement between Mr. Blaeser and Concord Communications, this option became fully vested upon the consumation of the merger
(5) This option was assumed by Computer Associates in the merger and replaced with an option to purchase 37,995 shares of Computer Associates' common stock for $37.57 per share. In accordance with the Amendment and Restated Management Change in Control Agreement between Mr. Blaeser and Concord Communications, this option became fully vested upon the consumation of the merger
(6) This option was assumed by Computer Associates in the merger and replaced with an option to purchase 2,232 shares of Computer Associates' common stock for $14.94 per share. In accordance with the Amendment and Restated Management Change in Control Agreement between Mr. Blaeser and Concord Communications, this option became fully vested upon the consumation of the merger
(7) This option was assumed by Computer Associates in the merger and replaced with an option to purchase 895 shares of Computer Associates' common stock for $14.94 per share. In accordance with the Amendment and Restated Management Change in Control Agreement between Mr. Blaeser and Concord Communications, this option became fully vested upon the consumation of the merger
(8) This option was assumed by Computer Associates in the merger and replaced with an option to purchase 5,864 shares of Computer Associates' common stock for $20.87 per share. In accordance with the Amendment and Restated Management Change in Control Agreement between Mr. Blaeser and Concord Communications, this option became fully vested upon the consumation of the merger
(9) This option was assumed by Computer Associates in the merger and replaced with an option to purchase 6,941 shares of Computer Associates' common stock for $14.41 per share. In accordance with the Amendment and Restated Management Change in Control Agreement between Mr. Blaeser and Concord Communications, this option became fully vested upon the consumation of the merger
(10) This option was assumed by Computer Associates in the merger and replaced with an option to purchase 20,423 shares of Computer Associates' common stock for $14.41 per share. In accordance with the Amendment and Restated Management Change in Control Agreement between Mr. Blaeser and Concord Communications, this option became fully vested upon the consumation of the merger
(11) This option was assumed by Computer Associates in the merger and replaced with an option to purchase 4,269 shares of Computer Associates' common stock for $23.43 per share. In accordance with the Amendment and Restated Management Change in Control Agreement between Mr. Blaeser and Concord Communications, this option became fully vested upon the consumation of the merger
(12) This option was assumed by Computer Associates in the merger and replaced with an option to purchase 27,005 shares of Computer Associates' common stock for $23.43 per share. In accordance with the Amendment and Restated Management Change in Control Agreement between Mr. Blaeser and Concord Communications, this option became fully vested upon the consumation of the merger

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