FRONTIER INSURANCE GROUP INC

Q: Mar 31 2001

FY: Dec 31 2000

FY: Dec 31 2000

Q: Sep 30 2000

Q: Sep 30 2000

Q: Jun 30 2000

Q: Jun 30 2000

Q: Mar 31 2000

Q: Mar 31 2000

FY: Dec 31 1999

FY: Dec 31 1999

Q: Sep 30 1999

Q: Sep 30 1999

Q: Jun 30 1999

Q: Mar 31 1999

FY: Dec 31 1998

Q: Sep 30 1998

Q: Jun 30 1998

Q: Jun 30 1998

Q: Mar 31 1998

1.03,3.01,9.01

1.03,9.01

8.01

FILED AS OF DATE: 20010615

5

5

4,7

4,7

7

2,7

5

5,7

5,7

5

7

2,5,7

5,7

7

Current report pursuant to Section 13 or 15(d)

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

Post-effective amendment to a registration statement

Prospectus filed under Rule 424(b)(1)

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933

Post-effective amendment to a registration statement

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933

Definitive Proxy Statement

Definitive Proxy Statement

Preliminary Proxy Statement

Definitive Proxy Statement

Preliminary Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Preliminary Proxy Statement

Definitive Proxy Statement

DIMENSIONAL FUND ADVISORS INC

WELLINGTON MANAGEMENT CO LLP

DIMENSIONAL FUND ADVISORS INC

WEST HIGHLAND CAPITAL INC/LHG/WHP/PB/BP

DENVER INVESTMENT ADVISORS LLC

WELLINGTON MANAGEMENT CO LLP

DENVER INVESTMENT ADVISORS LLC

FRONTIER INSURANCE GROUP INC

FRONTIER INSURANCE GROUP INC

WELLS FARGO & CO

WELLINGTON MANAGEMENT CO LLP

DENVER INVESTMENT ADVISORS LLC

FIRST INTERSTATE BANCORP /DE/

WELLINGTON MANAGEMENT CO

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