OSCA INC

Q: Mar 31 2002

FY: Dec 31 2001

FY: Dec 31 2001

Q: Sep 30 2001

Q: Jun 30 2001

Q: Mar 31 2001

FY: Dec 31 2000

Q: Sep 30 2000

Q: Jun 30 2000

5,7

Post Effective Amendment to S-8

Post Effective Amendment to S-8

Withdrawal of a registration statement

No description available

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

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933

Written communication about a business combination transaction (Rule 425)

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement with Pricing Information

Amended Initial Registration Statement

No description available

Amended Initial Registration Statement

Amended Initial Registration Statement

Registration (IPO) statement under Securities Act of 1933

No description available

No description available

No description available

Definitive Proxy Statement

TCW GROUP INC

GABELLI FUNDS INC ET AL

GABELLI FUNDS INC ET AL

GABELLI FUNDS INC ET AL

CANNELL CAPITAL LLC

GABELLI FUNDS INC ET AL

GABELLI FUNDS INC ET AL

TCW GROUP INC

CANNELL CAPITAL LLC

CHEN HERBERT

CRAMER ROSENTHAL MCGLYNN LLC /ADV

HIGH ROCK CAPITAL LLC

GREAT LAKES CHEMICAL CORP

TCW GROUP INC

CANNELL CAPITAL LLC

CHEN HERBERT

HIGH ROCK CAPITAL LLC

GREAT LAKES CHEMICAL CORP

ESSEX INVESTMENT MANAGEMENT CO INC

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)