ORBITAL SCIENCES CORP /DE/

Prospectus Supplement for Primary Offering

Notice of Effectiveness

Correspondence with the SEC

Letter from the SEC

Registration statement under Securities Act of 1933

Correspondence with the SEC

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

Prospectus Supplement for Primary Offering

Notice of Effectiveness

Letter from the SEC

Correspondence with the SEC

Registration statement under Securities Act of 1933

Correspondence with the SEC

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

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

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

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

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

1.02,2.01,3.01,3.03,5.01,5.02,5.03,8.01,9.01

Post Effective Amendment to S-8

Notification of removal from listing and/or registration on a national securities exchange

Post Effective Amendment to S-8

Post Effective Amendment to S-8

Post Effective Amendment to S-8

Post Effective Amendment to S-8

Post Effective Amendment to S-8

Post Effective Amendment to S-8

Post Effective Amendment to S-8

Post Effective Amendment to S-8

Post Effective Amendment to S-8

Post Effective Amendment to S-8

Post Effective Amendment to S-8

5.07,8.01,9.01

8.01

No description available

8.01,9.01

Additional Information for Proxy Statement/ Votes

8.01,9.01

Additional Information for Proxy Statement/ Votes

8.01,9.01

Additional Information for Proxy Statement/ Votes

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

Results of Operations and Financial Condition

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

2.02,9.01

Additional Information for Proxy Statement/ Votes

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

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Additional Information for Proxy Statement/ Votes

Specialized Disclosure Report

Additional Information for Proxy Statement/ Votes

Entry into a Material Definitive Agreement

Additional Information for Proxy Statement/ Votes

Other Events

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year

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

Results of Operations and Financial Condition

8.01

Annual Report Scanned (Paper)

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Annual report pursuant to Section 13 or 15(d)

Results of Operations and Financial Condition

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

2.02,9.01

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

2.02,9.01

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

5.07

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

2.02,9.01

Annual Report Scanned (Paper)

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Annual report pursuant to Section 13 or 15(d)

2.02,9.01

Correspondence with the SEC

Letter from the SEC

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

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

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

Letter from the SEC

Correspondence with the SEC

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

Annual Report Scanned (Paper)

Correspondence with the SEC

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Annual report pursuant to Section 13 or 15(d)

Correspondence with the SEC

Correspondence with the SEC

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

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

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

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

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Annual report pursuant to Section 13 or 15(d)

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

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

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

Definitive Proxy Statement

THOMPSON JAMES R JR

Culbertson Frank L. Jr.

HANISEE ROBERT M

Larkin Michael E.

OBUCHOWSKI JANICE I

PIERCE GARRETT E

Thompson Hollis M

FISK LENNARD A

GRABE RONALD J/VA

Roche James G

WEBSTER SCOTT L

Chilton Kevin P.

THOMPSON DAVID W

SCHMITT HARRISON H

MCCABE THOMAS E