| SC 13G/A | 2015-02-10 | FIRST TRUST PORTFOLIOS LP | FIRST TRUST EXCHANGE-TRADED FUND | 386,547 | 10.6% | EDGAR |
| SC 13G/A | 2015-02-06 | FIRST TRUST PORTFOLIOS LP | FIRST TRUST EXCHANGE-TRADED FUND | 3,085,754 | 14.9% | EDGAR |
| SC 13G/A | 2015-02-02 | FIRST TRUST PORTFOLIOS LP | FIRST TRUST EXCHANGE-TRADED FUND | 3,896,912 | 12.1% | EDGAR |
| SC 13G | 2015-01-27 | FIRST TRUST PORTFOLIOS LP | FIRST TRUST EXCHANGE-TRADED FUND | 356,812 | 9.2% | EDGAR |
| SC 13G/A | 2015-01-26 | J.J.B. Hilliard, W.L. Lyons, LLC | FIRST TRUST EXCHANGE-TRADED FUND | 143,689 | 4.8% | EDGAR |
| SC 13G/A | 2015-01-13 | FIRST TRUST PORTFOLIOS LP | FIRST TRUST EXCHANGE-TRADED FUND | 145,295 | 4.8% | EDGAR |
| SC 13G | 2014-12-10 | FIRST TRUST PORTFOLIOS LP | FIRST TRUST EXCHANGE-TRADED FUND | 3,235,514 | 10.3% | EDGAR |
| SC 13G | 2014-11-10 | FIRST TRUST PORTFOLIOS LP | FIRST TRUST EXCHANGE-TRADED FUND | 1,985,060 | 10.9% | EDGAR |
| SC 13G | 2014-02-10 | J.J.B. Hilliard, W.L. Lyons, LLC | FIRST TRUST EXCHANGE-TRADED FUND | 163,543 | 5.3% | EDGAR |
| SC 13G/A | 2014-02-04 | FIRST TRUST PORTFOLIOS LP | FIRST TRUST EXCHANGE-TRADED FUND | 110,033 | 7.6% | EDGAR |
| SC 13G/A | 2013-08-09 | FIRST TRUST PORTFOLIOS LP | FIRST TRUST EXCHANGE-TRADED FUND | 78,326 | 8.2% | EDGAR |
| SC 13G/A | 2013-02-07 | FIRST TRUST PORTFOLIOS LP | FIRST TRUST EXCHANGE-TRADED FUND | 50,798 | 14.5% | EDGAR |
| SC 13G | 2012-10-10 | FIRST TRUST PORTFOLIOS LP | FIRST TRUST EXCHANGE-TRADED FUND | 45,906 | 10.2% | EDGAR |
| SC 13G/A | 2011-05-10 | WELLS FARGO & CO/MN | FIRST TRUST EXCHANGE-TRADED FUND | 150,506 | 4.1% | EDGAR |
| SC 13G/A | 2011-01-25 | WELLS FARGO & CO/MN | FIRST TRUST EXCHANGE-TRADED FUND | 2,035,849 | 11.5% | EDGAR |
| SC 13G/A | 2011-01-20 | WELLS FARGO & CO/MN | FIRST TRUST EXCHANGE-TRADED FUND | 190,624 | 6.0% | EDGAR |
| SC 13G/A | 2010-02-11 | WELLS FARGO & CO/MN | FIRST TRUST EXCHANGE-TRADED FUND | 230,897 | 13.2% | EDGAR |
| SC 13G/A | 2010-01-22 | WELLS FARGO & CO/MN | FIRST TRUST EXCHANGE-TRADED FUND | 510,886 | 15.7% | EDGAR |
| SC 13G/A | 2010-01-22 | WELLS FARGO & CO/MN | FIRST TRUST EXCHANGE-TRADED FUND | 154,021 | 8.1% | EDGAR |
| SC 13G/A | 2010-01-22 | WELLS FARGO & CO/MN | FIRST TRUST EXCHANGE-TRADED FUND | 502,219 | 12.4% | EDGAR |