KEYSPAN ENERGY CORP /NY/

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

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

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

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

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

1,5,7

No description available

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

5,7

No description available

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

Annual report pursuant to Section 13 or 15(d)

5,7

No description available

No description available

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

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

5,7

No description available

Post-effective amendment to a registration statement

Post-effective amendment to a registration statement

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933

Registration statement under Securities Act of 1933