MICROSEMI CORPORATION

Selected GAAP and Non-GAAP Financial Measures

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

Quarter Ended

Fiscal Year Ended

Sep 30,

2012

Jul 1,

2012

Oct 2,

2011

Sep 30,

2012

Oct 2,

2011

Net sales

$

263.1

$

259.2

$

227.3

$

1,012.5

$

835.9

Selected GAAP Financial Measures

Gross profit

$

150.4

$

144.6

$

129.9

$

552.6

$

441.2

Gross margin

57.2%

55.8%

57.1%

54.6%

52.8%

Operating income

$

26.6

$

21.3

$

28.8

$

58.3

$

55.0

Operating margin

10.1%

8.2%

12.7%

5.8%

6.6%

Net income (loss)

$

11.6

$

8.1

$

43.4

$

(29.7)

$

55.7

Diluted earnings (loss) per share

$

0.13

$

0.09

$

0.50

$

(0.35)

$

0.65

Selected Non-GAAP Financial Measures

Gross profit

$

150.4

$

145.6

$

130.2

$

565.0

$

469.3

Gross margin

57.2%

56.2%

57.3%

55.8%

56.1%

Operating income

$

64.5

$

60.7

$

59.7

$

231.9

$

212.0

Operating margin

24.5%

23.4%

26.3%

22.9%

25.4%

Net income

$

51.8

$

48.3

$

45.6

$

173.9

$

157.1

Diluted earnings per share

$

0.58

$

0.55

$

0.53

$

1.99

$

1.83