JOINT FILER INFORMATION



Name:  MGG Midstream Holdings GP, LLC

Address: One Williams Center

  Tulsa, OK 74172



Designated Filer:  MGG Midstream Holdings, L.P.

Issuer & Ticker Symbol: Magellan Midstream Holdings, L.P. (MGG)

Date of Event Requiring Statement: 02/09/2006





Name:  Riverstone Holdings LLC

Address: 1 Greenwich Office Park

  Greenwich, CT 06831



Designated Filer:  MGG Midstream Holdings, L.P.

Issuer & Ticker Symbol: Magellan Midstream Holdings, L.P. (MGG)

Date of Event Requiring Statement: 02/09/2006





Name:  Carlyle/Riverstone MLP Holdings, L.P.

Name:  Carlyle/Riverstone Energy Partners II, L.P.

Name:  C/R Energy GP II, LLC

Address: c/o The Carlyle Group

  1001 Pennsylvania Avenue, N.W., Ste. 220 S.

  Washington, D.C. 20004-2505



Designated Filer:  MGG Midstream Holdings, L.P.

Issuer & Ticker Symbol: Magellan Midstream Holdings, L.P. (MGG)

Date of Event Requiring Statement: 02/09/2006





Name:  Madison Dearborn Capital Partners IV, L.P.

Name:  Madison Dearborn Partners IV, L.P.

Name:  Madison Dearborn Partners, L.L.C.

Address: Three First National Plaza, Ste. 3800

  Chicago, IL 60602



Designated Filer:  MGG Midstream Holdings, L.P.

Issuer & Ticker Symbol: Magellan Midstream Holdings, L.P. (MGG)

Date of Event Requiring Statement: 02/09/2006







SIGNATURES OF REPORTING PERSONS EACH DATED 02/09/2006



MGG Midstream Holdings GP, LLC





By:  /s/ Lonny E. Townsend

Name: Lonny E. Townsend

Title: VP and General Counsel



Carlyle/Riverstone MLP Partners, L.P.

By: Carlyle/Riverstone Energy Partners II, L.P.,

 Its General Partner



By: C/R Energy GP II, LLC,

 Its General Partner





By:  /s/ N. John Lancaster, Jr.

Name: N. John Lancaster, Jr.

Title: Managing Director



Carlyle/Riverstone Energy Partners II, L.P.

By: C/R Energy GP II, LLC,

 Its General Partner





By:  /s/ N. John Lancaster, Jr.

Name: N. John Lancaster, Jr.

Title: Managing Director



C/R Energy GP II, LLC





By:  /s/ N. John Lancaster, Jr.

Name: N. John Lancaster, Jr.

Title: Managing Director



Riverstone Holdings, LLC





By:  /s/ N. John Lancaster, Jr.

Name: N. John Lancaster, Jr.

Title: Managing Director





Madison Dearborn Capital Partners IV, L.P.

By: Madison Dearborn Partners IV, L.P.,

 Its General Partner



By: Madison Dearborn Partners, L.L.C.,

 Its General Partner





By:  /s/ Thomas S. Souleles

Name: Thomas S. Souleles

Title: Managing Director



Madison Dearborn Partners IV, L.P.

By: Madison Dearborn Partners, L.L.C.,

 Its General Partner





By:  /s/ Thomas S. Souleles

Name: Thomas S. Souleles

Title: Managing Director



Madison Dearborn Partners, L.L.C.





By:  /s/ Thomas S. Souleles

Name: Thomas S. Souleles

Title: Managing Director