| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13G/A | 2017-02-09 | DIMENSIONAL FUND ADVISORS LP | Horsehead Holding Corp | 0 | 0.0% | EDGAR |
| SC 13G/A | 2016-02-16 | Greywolf Capital Management LP | Horsehead Holding Corp | 3,228,722 | 5.6% | EDGAR |
| SC 13G/A | 2016-02-12 | RS INVESTMENT MANAGEMENT CO LLC | Horsehead Holding Corp | 0 | 0.0% | EDGAR |
| SC 13G/A | 2016-02-11 | VANGUARD GROUP INC | Horsehead Holding Corp | 2,810,798 | 4.8% | EDGAR |
| SC 13G/A | 2016-02-09 | DIMENSIONAL FUND ADVISORS LP | Horsehead Holding Corp | 1,866,699 | 3.2% | EDGAR |
| SC 13G/A | 2016-01-27 | Dalal Street, LLC | Horsehead Holding Corp | - | - | EDGAR |
| SC 13G/A | 2016-01-26 | BlackRock Inc. | Horsehead Holding Corp | 3,179,324 | 5.5% | EDGAR |
| SC 13G/A | 2016-01-22 | Dalal Street, LLC | Horsehead Holding Corp | - | - | EDGAR |
| SC 13G/A | 2015-02-17 | Greywolf Capital Management LP | Horsehead Holding Corp | 3,400,300 | 6.1% | EDGAR |
| SC 13G/A | 2015-02-13 | HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC | Horsehead Holding Corp | 2,127,700 | 4.2% | EDGAR |
| SC 13G/A | 2015-02-12 | RS INVESTMENT MANAGEMENT CO LLC | Horsehead Holding Corp | 4,532,054 | 8.9% | EDGAR |
| SC 13G/A | 2015-02-10 | VANGUARD GROUP INC | Horsehead Holding Corp | 3,066,016 | 6.0% | EDGAR |
| SC 13G/A | 2015-02-05 | DIMENSIONAL FUND ADVISORS LP | Horsehead Holding Corp | 2,977,622 | 5.9% | EDGAR |
| SC 13G/A | 2015-02-02 | ROYCE & ASSOCIATES LLC | Horsehead Holding Corp | 2,154,562 | 4.2% | EDGAR |
| SC 13G/A | 2015-01-30 | BlackRock Inc. | Horsehead Holding Corp | 3,041,973 | 6.0% | EDGAR |
| SC 13G | 2014-10-02 | Greywolf Capital Management LP | Horsehead Holding Corp | 2,650,000 | 5.2% | EDGAR |
| SC 13G/A | 2014-02-14 | RS INVESTMENT MANAGEMENT CO LLC | Horsehead Holding Corp | 4,935,716 | 9.8% | EDGAR |
| SC 13G | 2014-02-14 | HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC | Horsehead Holding Corp | 2,612,300 | 5.2% | EDGAR |
| SC 13G/A | 2014-02-13 | Dalal Street, LLC | Horsehead Holding Corp | - | - | EDGAR |
| SC 13G/A | 2014-02-11 | VANGUARD GROUP INC | Horsehead Holding Corp | 2,872,915 | 5.7% | EDGAR |