Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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 *
  Volpe Kenneth Z
 2. Date of Event Requiring Statement (Month/Day/Year)
04/04/2005		 3. Issuer Name and Ticker or Trading Symbol
ART TECHNOLOGY GROUP INC [ARTG]
(Last)
(First)
(Middle)
25 FIRST ST., 2ND FLOOR		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
SVP, Products and Technology
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

CAMBRIDGE, MA 02141		 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 Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 3,774
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option (right to buy) 01/21/1999 10/20/2008 Common Stock 44,200 $ 0.25 D  
Employee Stock Option (right to buy) 01/21/2005 04/20/2013 Common Stock 43,750 $ 0.91 D  
Employee Stock Option (right to buy) 07/21/2003 04/20/2013 Common Stock 26,250 $ 0.91 D  
Employee Stock Option (right to buy) 02/28/2003 08/28/2012 Common Stock 10,000 $ 0.96 D  
Employee Stock Option (right to buy) 02/28/2005 08/29/2014 Common Stock 117,188 $ 0.96 D  
Employee Stock Option (right to buy) 11/30/2004 08/29/2014 Common Stock 7,812 $ 0.96 D  
Employee Stock Option (right to buy) 03/03/2003 03/02/2013 Common Stock 13,333 $ 0.99 D  
Employee Stock Option (right to buy) 01/25/2006 01/24/2015 Common Stock 100,000 $ 1.26 D  
Employee Stock Option (right to buy) 01/30/2005 01/29/2014 Common Stock 40,625 $ 1.57 D  
Employee Stock Option (right to buy) 04/30/2004 01/29/2014 Common Stock 9,375 $ 1.57 D  
Employee Stock Option (right to buy) 02/13/2005 11/12/2013 Common Stock 22,500 $ 1.63 D  
Employee Stock Option (right to buy) 02/13/2004 11/12/2013 Common Stock 7,500 $ 1.63 D  
Employee Stock Option (right to buy) 02/03/2002 08/02/2011 Common Stock 14,998 $ 2.13 D  
Employee Stock Option (right to buy) 02/03/2003 08/02/2011 Common Stock 2 $ 2.13 D  
Employee Stock Option (right to buy) 01/08/2004 01/07/2012 Common Stock 1,251 $ 3.9 D  
Employee Stock Option (right to buy) 04/08/2002 01/07/2012 Common Stock 2,749 $ 3.9 D  
Employee Stock Option (right to buy) 07/09/2001 04/08/2011 Common Stock 1,047 $ 4.7812 D  
Employee Stock Option (right to buy) 07/09/2001 04/08/2011 Common Stock 7,219 $ 4.7812 D  
Employee Stock Option (right to buy) 10/19/1999 07/18/2009 Common Stock 2,000 $ 5 D  
Employee Stock Option (right to buy) 12/31/2001 05/01/2011 Common Stock 2,000 $ 9.31 D  
Employee Stock Option (right to buy) 01/01/2000 09/30/2009 Common Stock 19,782 $ 19.0312 D  
Employee Stock Option (right to buy) 07/01/2000 09/30/2009 Common Stock 10,218 $ 19.0312 D  
Employee Stock Option (right to buy) 01/18/2004 10/17/2010 Common Stock 1,282 $ 78 D  
Employee Stock Option (right to buy) 01/18/2001 10/17/2010 Common Stock 8,718 $ 78 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Volpe Kenneth Z
25 FIRST ST., 2ND FLOOR
CAMBRIDGE, MA 02141		       SVP, Products and Technology  

Signatures

Michael Pellini 04/14/2005
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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.

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