| Date | Acquired | Amount |
|---|---|---|
| Feb 10, 2017 |
|
$ 17,900,000,000 |
| Mar 10, 2014 |
|
Undisclosed amount |
| Nov 22, 2012 |
|
$ 1,400,000,000 |
| Dec 13, 2010 |
|
Undisclosed amount |
| Jul 21, 2010 |
|
£ 2,500,000,000 |
