MICROSEMI CORPORATION

Selected GAAP and Non-GAAP Financial Measures

(Unaudited, in millions except, for percentages and per share amounts)

Quarter Ended

Six Months Ended

Mar 31,
2013

Dec 30,
2012

Apr 1,
2012

Mar 31,
2013

Apr 1,
2012

Net sales

$

235.3

$

247.6

$

249.3

$

482.9

$

490.2

Selected GAAP Financial Measures

Gross profit

$

133.5

$

142.6

$

131.9

$

276.1

$

257.6

Gross margin

56.7

%

57.6

%

52.9

%

57.2

%

52.5

%

Operating income

$

11.8

$

25.5

$

11.1

$

37.3

$

10.4

Operating margin

5.0

%

10.3

%

4.5

%

7.7

%

2.1

%

Net income (loss)

$

(2.9)

$

14.2

$

(4.8)

$

11.3

$

(49.5)

Diluted earnings (loss) per share

$

(0.03)

$

0.16

$

(0.06)

$

0.12

$

(0.58)

Selected Non-GAAP Financial Measures

Gross profit

$

133.5

$

142.6

$

137.1

$

276.1

$

268.9

Gross margin

56.7

%

57.6

%

55.0

%

57.2

%

54.9

%

Operating income

$

50.0

$

56.7

$

54.9

$

106.7

$

106.7

Operating margin

21.2

%

22.9

%

22.0

%

22.1

%

21.8

%

Net income

$

38.9

$

45.0

$

40.3

$

83.9

$

73.9

Diluted earnings per share

$

0.43

$

0.50

$

0.46

$

0.93

$

0.85