13G Filing: Dorsal Capital Management and Infoblox Inc (BLOX)

CUSIP No. 45672H104

Page 2 of 12

1

NAME OF REPORTING PERSON OR

I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

Dorsal Capital Partners Master Fund, L.P.

2

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a)  o

(b)  o

3

SEC USE ONLY

4

CITIZENSHIP OR PLACE OF ORGANIZATION

Cayman Islands

NUMBER OF

SHARES

BENEFICIALLY OWNED

BY EACH REPORTING

PERSON

WITH

5

SOLE VOTING POWER

3,100,000

6

SHARED VOTING POWER

0

7

SOLE DISPOSITIVE POWER

3,100,000

8

SHARED DISPOSITIVE POWER

0

9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

3,100,000

10

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

11

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

5.2%

12

TYPE OF REPORTING PERSON

PN