Sec Form 4 Filing - VAJDA DAVID J @ NISOURCE INC/DE - 2005-08-17

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 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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1. Name and Address of Reporting Person VAJDA DAVID J 2. Issuer Name and Ticker or Trading Symbol NISOURCE INC/DE [ NI] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Vice President and Treasurer (Last) (First) (Middle) 801 E 86TH AVENUE 3. Date of Earliest Transaction (MM/DD/YY) 08/17/2005 (Street) MERRILLVILLE, IN46410-6272 4. If Amendment, Date Original Filed (MM/DD/YY) 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 08/17/2005 08/17/2005 M 5,000 A $ 16.2188 50,699 D Common Stock 2,319.021 ( 1 ) ( 2 ) I 401(k) Plan Common Stock 1,332.9414 ( 3 ) ( 4 ) I 401(k) Plan held by spouse

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 Non Qualified Stock Options $ 18.4375 01/30/2001 01/30/2010 Common Stock 4,000 4,000 D Non Qualified Stock Options $ 18.9063 08/26/1997 08/26/2006 Common Stock 6,300 6,300 D Non Qualified Stock Options $ 19.84 12/31/2002 12/31/2012 Common Stock 16,225 16,225 D Non Qualified Stock Options $ 20.6407 08/25/1998 08/25/2007 Common Stock 6,000 6,000 D Non Qualified Stock Options $ 21.005 01/24/2003 01/24/2012 Common Stock 7,135 7,135 D Non Qualified Stock Options $ 21.86 01/01/2005 01/01/2014 Common Stock 18,855 18,855 D Non Qualified Stock Options $ 22.22 08/21/2001 08/21/2010 Common Stock 4,000 4,000 D Non Qualified Stock Options $ 22.62 01/03/2006 01/03/2015 Common Stock 46,286 46,286 D Non Qualified Stock Options $ 24.5938 08/23/2000 08/23/2009 Common Stock 6,000 6,000 D Non Qualified Stock Options $ 25.94 12/31/2001 12/31/2010 Common Stock 5,896 5,896 D Non Qualified Stock Options $ 29.2188 08/24/1999 08/24/2008 Common Stock 6,000 6,000 D Non Qualified Stock Options $ 16.2188 08/17/2005 08/17/2005 M 5,000 08/22/1995 08/21/2005 Common Stock 5,000 $ 16.2188 0 D Non Qualified Stock Options $ 21.005 01/24/2003 01/24/2012 Common Stock 1,500 1,500 I NQSO held by spouse Non Qualified Stock Options $ 21.795 01/23/2005 01/23/2014 Common Stock 2,000 2,000 I NQSO held by spouse Non Qualified Stock Options $ 22.22 08/21/2001 08/21/2010 Common Stock 2,000 2,000 I NQSO held by spouse Non Qualified Stock Options $ 22.62 01/03/2006 01/03/2015 Common Stock 2,250 2,250 I NQSO held by spouse Non Qualified Stock Options $ 23.725 05/20/2003 05/20/2012 Common Stock 1,500 1,500 I NQSO held by spouse Non Qualified Stock Options $ 24.5938 08/23/2000 08/23/2009 Common Stock 1,500 1,500 I NQSO held by spouse Non Qualified Stock Options $ 25.94 12/31/2001 12/31/2010 Common Stock 2,000 2,000 I NQSO held by spouse Non Qualified Stock Options $ 29.2188 08/24/1999 08/24/2008 Common Stock 1,500 1,500 I NQSO held by spouse

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other VAJDA DAVID J 801 E 86TH AVENUE MERRILLVILLE, IN46410-6272 Vice President and Treasurer Signatures Gary W. Pottorff, Power of Attorney for David J. Vajda 08/19/2005 Signature of Reporting Person Date

Explanation of Responses:

( 2 )Includes 35.2254 shares acquired on June 30, 2005 through the NiSource 401(k) Plan ( 4 )Includes 35.4134 shares acquired on June 30, 2005 by spouse through the NiSource 401(k) Plan. ( 1 )Includes 33.5159 shares acquired on March 31, 2005 through the NiSource 401(k) Plan. ( 3 )Includes 14.3101 shares acquired on March 31, 2005 by spouse through the NiSource 401(k) Plan

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).

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