| December 19, 2017 | AQR Capital Management, LLC | 0.51% | still open |
| December 22, 2016 | Insight Investment Management (global) LTD | 0.49% | still open |
| December 7, 2016 | Echo Street Capital Management LLC | 0.44% | still open |
| December 2, 2016 | Insight Investment Management (global) LTD | 0.58% | still open |
| December 2, 2016 | Echo Street Capital Management LLC | 0.52% | still open |
| November 30, 2016 | Echo Street Capital Management LLC | 0.60% | still open |
| November 28, 2016 | Insight Investment Management (global) LTD | 0.64% | still open |
| November 23, 2016 | Echo Street Capital Management LLC | 0.53% | still open |
| November 17, 2016 | Insight Investment Management (global) LTD | 0.71% | still open |
| October 25, 2016 | Insight Investment Management (global) LTD | 0.68% | still open |
| June 27, 2016 | Echo Street Capital Management LLC | 0.36% | still open |
| June 16, 2016 | Echo Street Capital Management LLC | 0.56% | still open |
| February 16, 2016 | Echo Street Capital Management LLC | 0.46% | still open |
| February 9, 2016 | Echo Street Capital Management LLC | 0.56% | still open |
| February 3, 2016 | Insight Investment Management (global) LTD | 0.73% | still open |
| February 2, 2016 | Insight Investment Management (global) LTD | 0.68% | still open |
| January 15, 2016 | Insight Investment Management (global) LTD | 0.56% | still open |
| December 14, 2015 | Echo Street Capital Management LLC | 0.71% | still open |
| December 4, 2015 | Echo Street Capital Management LLC | 0.64% | still open |
| December 2, 2015 | Echo Street Capital Management LLC | 0.53% | still open |
| February 27, 2014 | Blackrock Institutional Trust Company, National Association | 0.49% | still open |
| February 25, 2014 | Blackrock Institutional Trust Company, National Association | 0.50% | still open |
| February 20, 2014 | Blackrock Institutional Trust Company, National Association | 0.48% | still open |
| February 12, 2014 | Blackrock Institutional Trust Company, National Association | 0.50% | still open |
| February 7, 2014 | Blackrock Institutional Trust Company, National Association | 0.49% | still open |
| February 4, 2014 | Blackrock Institutional Trust Company, National Association | 0.50% | still open |
| January 7, 2014 | Blackrock Institutional Trust Company, National Association | 0.45% | still open |
| December 3, 2013 | Blackrock Institutional Trust Company, National Association | 0.56% | still open |
| November 5, 2013 | Blackrock Institutional Trust Company, National Association | 0.68% | still open |
| October 29, 2013 | Blackrock Institutional Trust Company, National Association | 0.71% | still open |
| October 22, 2013 | Blackrock Institutional Trust Company, National Association | 0.63% | still open |
| October 2, 2013 | Blackrock Institutional Trust Company, National Association | 0.59% | still open |
| October 1, 2013 | Blackrock Institutional Trust Company, National Association | 0.60% | still open |
| September 11, 2013 | Blackrock Institutional Trust Company, National Association | 0.59% | still open |
| September 10, 2013 | Blackrock Institutional Trust Company, National Association | 0.60% | still open |
| May 21, 2013 | Blackrock Institutional Trust Company, National Association | 0.57% | still open |
| March 26, 2013 | Blackrock Institutional Trust Company, National Association | 0.67% | still open |
| March 19, 2013 | Blackrock Institutional Trust Company, National Association | 0.70% | still open |
| February 7, 2013 | Blackrock Investment Management (UK) Limited | 0.44% | still open |
| January 24, 2013 | Blackrock Institutional Trust Company, National Association | 0.68% | still open |
| January 22, 2013 | Blackrock Investment Management (UK) Limited | 0.66% | still open |
| November 1, 2012 | Blackrock Institutional Trust Company, National Association | 0.77% | still open |
| November 1, 2012 | Blackrock Investment Management (UK) Limited | 0.74% | still open |