| April 8, 2019 | Blackrock Institutional Trust Company, National Association | 0.88% | still open |
| March 18, 2019 | Blackrock Institutional Trust Company, National Association | 0.99% | still open |
| March 15, 2019 | Millennium International Management LP | 2.10% | still open |
| March 13, 2019 | Blackrock Institutional Trust Company, National Association | 1.08% | still open |
| February 21, 2019 | Blackrock Institutional Trust Company, National Association | 1.10% | still open |
| February 7, 2019 | Blackrock Institutional Trust Company, National Association | 1.00% | still open |
| January 9, 2019 | Blackrock Institutional Trust Company, National Association | 0.99% | still open |
| December 7, 2018 | Blackrock Institutional Trust Company, National Association | 1.09% | still open |
| October 3, 2018 | Blackrock Institutional Trust Company, National Association | 1.11% | still open |
| September 28, 2018 | Blackrock Institutional Trust Company, National Association | 1.09% | still open |
| September 5, 2018 | Blackrock Institutional Trust Company, National Association | 1.10% | still open |
| August 10, 2018 | Blackrock Institutional Trust Company, National Association | 1.00% | still open |
| July 23, 2018 | Blackrock Institutional Trust Company, National Association | 0.90% | still open |
| July 19, 2018 | Blackrock Institutional Trust Company, National Association | 0.89% | still open |
| July 16, 2018 | Blackrock Institutional Trust Company, National Association | 0.90% | still open |
| June 28, 2018 | Blackrock Institutional Trust Company, National Association | 0.89% | still open |
| May 23, 2018 | Blackrock Institutional Trust Company, National Association | 0.99% | still open |
| April 3, 2018 | Blackrock Institutional Trust Company, National Association | 1.01% | still open |
| March 22, 2018 | Blackrock Institutional Trust Company, National Association | 0.91% | still open |
| March 15, 2018 | Blackrock Institutional Trust Company, National Association | 0.80% | still open |
| March 5, 2018 | Blackrock Institutional Trust Company, National Association | 0.70% | still open |
| February 28, 2018 | Blackrock Institutional Trust Company, National Association | 0.61% | still open |
| February 19, 2018 | Blackrock Institutional Trust Company, National Association | 0.59% | still open |
| February 14, 2018 | Blackrock Institutional Trust Company, National Association | 0.60% | still open |
| December 14, 2017 | Blackrock Institutional Trust Company, National Association | 0.50% | still open |
| July 13, 2015 | Cigogne Management SA | 0.00% | still open |
| July 2, 2015 | Cigogne Management SA | 0.92% | still open |
| June 30, 2015 | Cigogne Management SA | 0.82% | still open |
| June 26, 2015 | Cigogne Management SA | 0.70% | still open |
| March 15, 2013 | Aristeia Capital, L.L.C. | 0.19% | still open |
| February 27, 2013 | Aristeia Capital, L.L.C. | 0.69% | still open |