| May 28, 2013 | Maverick Capital, LTD. | 4.25% | still open |
| May 24, 2013 | Maverick Capital, LTD. | 4.33% | still open |
| May 24, 2013 | Blackrock Institutional Trust Company, National Association | 0.60% | still open |
| May 23, 2013 | Maverick Capital, LTD. | 4.53% | still open |
| May 23, 2013 | Blackrock Institutional Trust Company, National Association | 0.59% | still open |
| May 22, 2013 | Maverick Capital, LTD. | 4.97% | still open |
| May 21, 2013 | Maverick Capital, LTD. | 5.19% | still open |
| May 21, 2013 | Oxford Asset Management | 1.11% | still open |
| May 20, 2013 | Maverick Capital, LTD. | 5.24% | still open |
| May 20, 2013 | AQR Capital Management, LLC | 1.71% | still open |
| May 20, 2013 | Highbridge Capital Management LLC | 0.81% | still open |
| May 16, 2013 | Maverick Capital, LTD. | 5.36% | still open |
| May 16, 2013 | Blackrock Institutional Trust Company, National Association | 0.68% | still open |
| May 15, 2013 | Maverick Capital, LTD. | 5.42% | still open |
| May 13, 2013 | AQR Capital Management, LLC | 1.61% | still open |
| May 10, 2013 | Maverick Capital, LTD. | 5.66% | still open |
| May 7, 2013 | Maverick Capital, LTD. | 5.75% | still open |
| May 6, 2013 | AQR Capital Management, LLC | 1.52% | still open |
| May 3, 2013 | Maverick Capital, LTD. | 5.86% | still open |
| May 3, 2013 | Blackrock Institutional Trust Company, National Association | 0.78% | still open |
| May 3, 2013 | Highbridge Capital Management LLC | 0.71% | still open |
| May 2, 2013 | Maverick Capital, LTD. | 5.99% | still open |
| May 1, 2013 | Maverick Capital, LTD. | 6.07% | still open |
| April 30, 2013 | Blackrock Institutional Trust Company, National Association | 0.84% | still open |
| April 30, 2013 | Highbridge Capital Management LLC | 0.69% | still open |
| April 29, 2013 | AQR Capital Management, LLC | 1.49% | still open |
| April 26, 2013 | Highbridge Capital Management LLC | 0.76% | still open |
| April 25, 2013 | Highbridge Capital Management LLC | 0.80% | still open |
| April 23, 2013 | Oxford Asset Management | 1.05% | still open |
| April 23, 2013 | Highbridge Capital Management LLC | 0.72% | still open |
| April 22, 2013 | AQR Capital Management, LLC | 1.52% | still open |
| April 19, 2013 | Barrington Wilshire LLC | 1.30% | still open |
| April 19, 2013 | Blackrock Institutional Trust Company, National Association | 0.71% | still open |
| April 19, 2013 | Highbridge Capital Management LLC | 0.68% | still open |
| April 19, 2013 | Bluecrest Capital Management Limited | 0.52% | still open |
| April 19, 2013 | Pennant Capital Management, LLC | 0.49% | still open |
| April 18, 2013 | Highbridge Capital Management LLC | 0.72% | still open |
| April 17, 2013 | Highbridge Capital Management LLC | 0.86% | still open |
| April 16, 2013 | Highbridge Capital Management LLC | 0.96% | still open |
| April 15, 2013 | AQR Capital Management, LLC | 1.42% | still open |
| April 12, 2013 | Highbridge Capital Management LLC | 1.09% | still open |
| April 10, 2013 | Blackrock Institutional Trust Company, National Association | 0.66% | still open |
| April 9, 2013 | Maverick Capital, LTD. | 6.17% | still open |
| April 9, 2013 | Highbridge Capital Management LLC | 1.19% | still open |
| April 8, 2013 | Blackrock Institutional Trust Company, National Association | 0.51% | still open |
| April 5, 2013 | Maverick Capital, LTD. | 6.20% | still open |
| April 5, 2013 | Highbridge Capital Management LLC | 1.20% | still open |
| April 3, 2013 | Highbridge Capital Management LLC | 1.11% | still open |
| April 2, 2013 | Maverick Capital, LTD. | 6.46% | still open |
| March 27, 2013 | Barrington Wilshire LLC | 1.23% | still open |