Sec Form 4 Filing - ZIMMERMAN S LANETTE @ NISOURCE INC/DE - 2005-03-15

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 ZIMMERMAN S LANETTE 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) Executive Vice President, Huma (Last) (First) (Middle) 801 E 86TH AVENUE 3. Date of Earliest Transaction (MM/DD/YY) 03/15/2005 (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 03/15/2005 03/15/2005 M 46,000 A $ 19.84 151,575 D Common Stock 03/15/2005 03/15/2005 S 46,000 D $ 22.9 105,575 D Common Stock 1,981.604 I 401(k) Plan

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 $ 19.84 03/15/2005 03/15/2005 M 46,000 01/01/2004 01/01/2013 Common Stock 46,000 $ 19.84 0 D Non Qualified Stock Options $ 21.005 01/25/2003 01/25/2012 Common Stock 24,258 24,258 D Non Qualified Stock Options $ 21.86 01/01/2005 01/01/2014 Common Stock 43,506 43,506 D Non Qualified Stock Options $ 22.62 01/03/2006 01/03/2015 Common Stock 106,800 106,800 D Non Qualified Stock Options $ 25.94 01/01/2002 01/01/2011 Common Stock 20,047 20,047 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other ZIMMERMAN S LANETTE 801 E 86TH AVENUE MERRILLVILLE, IN46410-6272 Executive Vice President, Huma Signatures Gary W. Pottorff, Power of Attorney 03/16/2005 Signature of Reporting Person Date

Explanation of Responses:
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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