A statement of beneficial ownership of common stock by certain persons

Statement of changes in beneficial ownership of securities

Statement of changes in beneficial ownership of securities

Statement of changes in beneficial ownership of securities

Statement of changes in beneficial ownership of securities

Statement of changes in beneficial ownership of securities

Statement of changes in beneficial ownership of securities

Report of unscheduled material events or corporate event

Quarterly report which provides a continuing view of a company's financial position

Securities offered to employees pursuant to employee benefit plans

Report of unscheduled material events or corporate event

Report of unscheduled material events or corporate event

Statement of changes in beneficial ownership of securities

Report of unscheduled material events or corporate event

Quarterly report which provides a continuing view of a company's financial position