COLUMBIA ENERGY GROUP

Q: Sep 30 2005

Q: Jun 30 2005

Q: Mar 31 2005

FY: Dec 31 2004

Q: Sep 30 2004

Q: Jun 30 2004

Q: Mar 31 2004

FY: Dec 31 2003

Q: Sep 30 2003

Q: Jun 30 2003

Q: Mar 31 2003

FY: Dec 31 2002

Q: Sep 30 2002

Q: Jun 30 2002

Q: Mar 31 2002

FY: Dec 31 2001

Q: Sep 30 2001

Q: Sep 30 2001

Q: Jun 30 2001

Q: Mar 31 2001

4,7

1

5

5

5

5

5

5

5

5,7

5

5

5

5

5

5

5

5

5

5

Post-effective amendment to a registration statement

Notice of Effectiveness

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933

Certification of termination of registration of a class of securities (Section 12(b))

Withdrawal of a registration statement

Certification of termination of registration of a class of securities (Section 12(b))

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

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Definitive Proxy Statement

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Definitive Proxy Statement

Preliminary Proxy Statement

COLUMBIA ENERGY GROUP

COLUMBIA ENERGY GROUP

COLUMBIA ENERGY GROUP

COLUMBIA ENERGY GROUP

MORGAN J P & CO INC

MORGAN J P & CO INC

COLUMBIA ENERGY GROUP

NISOURCE INC

MORGAN J P & CO INC

MASSACHUSETTS FINANCIAL SERVICES CO /MA/

COLUMBIA ENERGY GROUP

COLUMBIA ENERGY GROUP

NISOURCE INC

NISOURCE INC

COLUMBIA ENERGY GROUP

NISOURCE INC

NISOURCE INC

COLUMBIA ENERGY GROUP

NISOURCE INC

NISOURCE INC

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