Williams Companies Inc. (USA): Demerger of WPX Energy Inc. (USA)
Changes In FTSE Indices

20 December 2011


Subject to the completion of the demerger of WPX Energy Inc. (USA) from Williams Companies Inc. (USA, Constituent), FTSE announces the following changes:

INDEXCHANGEEFFECTIVE FROM
START OF TRADING
FTSE All-World IndexWPX Energy (USA, B40PCD9) will be added to the Large Cap Index with a shares in issue total of 196,298,337 and an investability weighting of 100%.

Williams Companies (USA, 2967181) will remain in the index with an unchanged shares in issue total of 588,895,011 and an unchanged investability weighting of 100%.
03 January 2012
FTSE World Index Ex-MultinationalsWPX Energy will be added to the index as detailed above.

Williams Companies will remain in the index as detailed above.

03 January 2012
FTSE Global Style IndexWPX Energy will be added to the index as detailed above.

Williams Companies will remain in the index as detailed above.

03 January 2012
Macquarie 100 IndexWPX Energy will be added to the index as detailed above.

Williams Companies will remain in the index as detailed above.

03 January 2012

Please note:

Effective from start of trading 03 January 2012, WPX Energy Inc. will have an ICB classification of 0577 (Pipelines). Effective from start of trading 05 January 2012, WPX Energy Inc.'s ICB classification will change to 0533 (Exploration & Production).

The Value and Growth rating for WPX Energy Inc. within the FTSE Global Style Index Series are as follows: Value: 100; Growth: 0

The Macquaire 100 Index will have 101 companies on 03 January 2012. The closing price of WPX Energy Inc. on 03 January 2012 will be used to rank the removal of the extra company in the index. The removal will be effective for 05 January 2012.

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