SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* RELATIONAL INVESTORS LLC (Last) (First) (Middle) 12400 HIGH BLUFF DRIVE, SUITE 600 (Street) SAN DIEGO CA 92130 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol NATIONAL SEMICONDUCTOR CORP [ NSM ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 05/01/2007
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/01/2007		P		600,000	A	$26.51	34,672,139	I	Through Limited Partnerships and managed accounts managed by reporting persons(1)(2)
Common Stock	05/02/2007		P		800,000	A	$26.93	35,472,139	I	Through Limited Partnerships and managed accounts managed by reporting persons(1)(2)
Common Stock	05/03/2007		P		702,700	A	$26.99	36,174,839	I	Through Limited Partnerships and managed accounts managed by reporting persons(1)(2)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person* RELATIONAL INVESTORS LLC (Last) (First) (Middle) 12400 HIGH BLUFF DRIVE, SUITE 600 (Street) SAN DIEGO CA 92130 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* WHITWORTH RALPH V (Last) (First) (Middle) 12400 HIGH BLUFF DRIVE, SUITE 600 (Street) SAN DIEGO CA 92130 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* BATCHELDER DAVID H (Last) (First) (Middle) 12400 HIGH BLUFF DRIVE, SUITE 600 (Street) SAN DIEGO CA 92130 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

Explanation of Responses:

1. Relational Investors, LLC, is the sole general partner of Relational Investors, L.P., Relational Fund Partners, L.P., Relational Coast Partners, L.P., Relational Partners, L.P., RH Fund 1, L.P., RH Fund 2, L.P., RH Fund 4, L.P., RH Fund 6, L.P., RH Fund 7, L.P., Relational Investors VIII, L.P., Relational Investors IX, L.P., Relational Investors XI, L.P., Relational Investors XV, L.P., Relational Investors XVI, L.P. and the sole managing member of Relational Asset Management LLC and Relational Investors X GP LLC which serve as the sole general partners of Relational Investors III, L.P. and Relational Investors X, L.P., respectively.

2. These Limited Partnerships own a total of 31,865,625 shares. An additional 4,309,214 shares are held in accounts managed by Relational Investors, LLC. All shares are owned indirectly by Relational Investors, LLC, and by Ralph V. Whitworth and David H. Batchelder (each of which is a reporting person hereunder) principals of Relational Investors, LLC. The reporting persons disclaim beneficial ownership of these securities except to the extent of their pecuniary interest therein.

	Relational Investors LLC By: /s/ Ralph V. Whitworth, Principal	05/03/2007
	/s/ Ralph V. Whitworth	05/03/2007
	/s/ David H. Batchelder	05/03/2007
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.