13G Filing: Primecap Management Co/Ca/ and NetApp Inc. (NTAP)

CUSIP No. 64110D104

1.

Names of Reporting Persons.
I.R.S. Identification Nos. of above persons (entities only).

PRIMECAP Management Company 95-3868081

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

(a)

o

(b)

o

3.

SEC Use Only

4.

Citizenship or Place of Organization
177 E. Colorado Blvd., 11th Floor, Pasadena, CA 91105

Number of
Shares
Beneficially by
Owned by
Each
Reporting
Person With:

5.

Sole Voting Power
12,982,370

6.

Shared Voting Power
0

7.

Sole Dispositive Power
40,262,995

8.

Shared Dispositive Power
0

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
40,262,995

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

11.

Percent of Class Represented by Amount in Row (9)
14.93%

12.

Type of Reporting Person (See Instructions)
IA