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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
820736	Orbital Sciences Corp	ORB	Radio & Tv Broadcasting & Communications Equipment (3663)	061209561

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1045853	W David Thompson	21839 Atlantic Blvd C/O Orbital Sciences Corp Dulles VA 20166	Cob And Ceo	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2010-03-08	60,000	$12.40	169,035	No	4	M	Direct
Common Stock	Disposition	2010-03-08	60,000	$18.37	109,035	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (right to buy)	Disposition	2010-03-08	60,000	$0.00	60,000	$12.40

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2010-05-11	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	23,000	Indirect	By Spouse

Footnotes

This transaction was executed in multiple trades at prices ranging from $18.25 to $18.52. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected.
The option vested in three installments on May 11, 2004, May 11, 2005 and October 26, 2005.