SONAT INC

Q: Jun 30 1999

Q: Mar 31 1999

FY: Dec 31 1998

Q: Sep 30 1998

Q: Jun 30 1998

Q: Mar 31 1998

FY: Dec 31 1997

Q: Sep 30 1997

Q: Jun 30 1997

Q: Mar 31 1997

FY: Dec 31 1996

Q: Sep 30 1996

Q: Aug 6 1996

Q: May 13 1996

FY: Mar 21 1996

Q: Sep 30 1995

Q: Aug 11 1995

Q: May 12 1995

FY: Mar 28 1995

Q: Nov 10 1994

5,7

5

5

5,7

5

FILED AS OF DATE: 19990108

5

5

5

5,7

5,7

5,7

5,7

5,7

5,7

5,7

5,6

Current report pursuant to Section 13 or 15(d)

Current report pursuant to Section 13 or 15(d)

Prospectus Supplement for Delayed or Continuous Offering

No description available

Registration of Securities on Exchange (amendment)

Registration statement under Securities Act of 1933

Prospectus Supplement for Delayed or Continuous Offering

Prospectus Supplement for Primary Offering

Prospectus Supplement with Pricing Information

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933

Prospectus Supplement for Delayed or Continuous Offering

Registration of Securities on Exchange

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement for Primary Offering

No description available

Preliminary Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Definitive Proxy Statement

Preliminary Proxy Statement

ZILKHA MICHAEL

ZILKHA SELIM K

EL PASO ENERGY CORP/DE

SONAT INC

SONAT INC

EL PASO ENERGY CORP/DE

EL PASO ENERGY CORP/DE

SONAT INC

SONAT INC

EL PASO ENERGY CORP/DE

ZILKHA MICHAEL

ZILKHA SELIM K

PUTNAM INVESTMENTS INC

ZILKHA MICHAEL

PRUDENTIAL INSURANCE CO OF AMERICA

ZILKHA MICHAEL

FMR CORP

PRUDENTIAL INSURANCE CO OF AMERICA

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)