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 *
SEMERJIAN DAYTON
   2. Issuer Name and Ticker or Trading Symbol
CONCORD COMMUNICATIONS INC [CCRD] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
EVP, Marketing
(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

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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) $ 11.05 06/07/2005   D     7,500 06/07/2005(1) 04/17/2008 Common Stock 7,500 $ 0 (1) 0 D  
Employee Stock Option (Right to Buy) $ 16.79 06/07/2005   D     4,700 06/07/2005(2) 12/10/2008 Common Stock 4,700 $ 0 (2) 0 D  
Employee Stock Option (Right to Buy) $ 12.24 06/07/2005   D     60,000 06/07/2005(3) 04/05/2012 Common Stock 60,000 $ 0 (3) 0 D  
Employee Stock Option (Right to Buy) $ 9.23 06/07/2005   D     75,000 06/07/2005(4) 04/05/2012 Common Stock 75,000 $ 0 (4) 0 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
SEMERJIAN DAYTON
C/O CONCORD COMMUNICATIONS, INC.
600 NICKERSON ROAD
MARLBORO, MA 01752		       EVP, Marketing  

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) This option was assumed by Computer Associates in the merger and replaced with an option to purchase 4,691 shares of Computer Associates common stock for $17.67 per share. In accordance with the Amendment and Restated Management Change in Control Agreement between Mr. Semerjian and Concord Communications, this option became fully vested upon the consumation of the merger
(2) This option was assumed by Computer Associates in the merger and replaced with an option to purchase 2,939 shares of Computer Associates common stock for $26.85 per share. In accordance with the Amendment and Restated Management Change in Control Agreement between Mr. Semerjian 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 37,530 shares of Computer Associates common stock for $19.57 per share. In accordance with the Amendment and Restated Management Change in Control Agreement between Mr. Semerjian 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 46,912 shares of Computer Associates common stock for $14.76 per share. In accordance with the Amendment and Restated Management Change in Control Agreement between Mr. Semerjian and Concord Communications, this option became fully vested upon the consumation of the merger

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