(1) Financial statement has been retroactively adjusted to reflect a decrease in the fair value of the contractual obligations assumed as part of the acquisition of Prism Circuits, Inc.

MOSYS, INC.
Reconciliation of GAAP to Non-GAAP Net Loss and Net Loss Per Share
(In thousands, except per share amounts; unaudited)
		Three Months Ended									Twelve Months Ended
		December 31,									December 31,
			2010				2009					2010				2009
GAAP net loss		$	(5,711	)		$	(4,892	)			$	(23,062	)		$	(19,104	)
Stock-based compensation expense
- Cost of net revenue			63				94					309				250
- Research and development			429				320					1,524				1,153
- Selling, general and administrative			510				532					1,465				1,651
Total stock-based compensation expense			1,002				946					3,298				3,054
Restructuring charges (1)			-				-					-				706
Amortization of intangible assets (2)			671				643					2,818				1,463
Acquisition-related contingent compensation charges (3)			-				488					987				1,110
Acquisition-related transaction costs (4)			-				-					195				300
Non-GAAP net loss		$	(4,038	)		$	(2,815	)			$	(15,764	)		$	(12,471	)
GAAP net loss per share			($0.17	)			($0.16	)				($0.72	)			($0.61	)
Reconciling items
- Stock-based compensation expense			0.03				0.03					0.10				0.10
- Restructuring charges (1)			-				-					-				0.02
- Amortization of intangible assets (2)			0.02				0.02					0.09				0.05
- Acquisition-related contingent compensation charges (3)			-				0.02					0.03				0.03
- Acquisition-related transaction costs (4)			-				-					0.01				0.01
Non-GAAP net loss per share: Basic and diluted			($0.12	)			($0.09	)				($0.49	)			($0.40	)
Shares used in computing non-GAAP net loss per share
Basic and diluted			33,130				31,219					31,870				31,238

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