HORSEHEAD RESOURCE DEVELOPMENT CO INC

Beneficial ownership report for a passive holder of more than 5% (Schedule 13G)

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Beneficial ownership report for a holder of more than 5% (Schedule 13D) (amendment)

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Certification of termination of registration of a class of securities (Section 12(g))

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Beneficial ownership report for a holder of more than 5% (Schedule 13D) (amendment)

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Beneficial ownership report for a holder of more than 5% (Schedule 13D) (amendment)

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Beneficial ownership report for a holder of more than 5% (Schedule 13D)

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General form for quarterly reports under Section 13 or 15(d)