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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1410172	Rubicon Technology Inc.	RBCN	Semiconductors & Related Devices (3674)	364419301

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1102188	P L Fund Technology Atlantic Cross	Five Radnor Corporate Center, Suite 555 100 Matsonford Road Radnor PA 19087	No	No	Yes	No
1113583	Co Investment 2000 Fund Lp	Five Radnor Corporate Center, Suite 555 100 Matsonford Road Radnor PA 19087	No	No	Yes	No
1165410	Cross Atlantic Technology Fund Ii Lp	Five Radnor Corporate Center, Suite 555 100 Matsonford Road Radnor PA 19087	No	No	Yes	No
1252434	Cross Atlantic Capital Partners Ii Inc	Five Radnor Corporate Center, Suite 555 100 Matsonford Road Radnor PA 19087	No	No	Yes	No
1254180	Xatf Management Ii Lp	Five Radnor Corporate Center, Suite 555 100 Matsonford Road Radnor PA 19087	No	No	Yes	No
1297591	Co-Invest Capital Partners Inc	Five Radnor Corporate Center, Suite 555 100 Matsonford Road Radnor PA 19087	No	No	Yes	No
1297592	Co-Invest Management Lp	Five Radnor Corporate Center, Suite 555 100 Matsonford Road Radnor PA 19087	No	No	Yes	No
1418340	Cross Atlantic Capital Partners, Inc.	Five Radnor Corporate Center, Suite 555 100 Matsonford Road Radnor PA 19087	No	No	Yes	No
1418345	Xatf Management, L.p.	Five Radnor Corporate Center, Suite 555 100 Matsonford Road Radnor PA 19087	No	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2010-06-21	500,000	$28.41	5,386,423	No	4	S	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See Footnote

Footnotes

Consists of shares held by Cross Atlantic Technology Fund, L.P., Cross Atlantic Technology Fund, II, L.P., and/or The Co-Investment 2000 Fund, L.P. Donald R. Caldwell, a director of the issuer, is the owner and director of Cross Atlantic Capital Partners, Inc., which is the general partner of XATF Management, L.P., which is the general partner of Cross Atlantic Technology Fund, L.P. Donald R. Caldwell is a director, shareholder and officer of Cross Atlantic Capital Partners II, Inc., which is the general partner of XATF Management II, L.P., which is the general partner of Cross Atlantic Technology Fund II, L.P. Donald R. Caldwell is a shareholder, director and officer of Co-Invest Capital Partners, Inc., which is the general partner of Co-Invest Management, L.P., which is the general partner of The Co-Investment 2000 Fund, L.P.
As part of the issuer's secondary offering, Cross Atlantic Technology Fund, L.P. sold 59,121 shares of its common stock, Cross Atlantic Technology Fund II, L.P. sold 208,534 shares of its common stock and The Co-Investment 2000 Fund, L.P. sold 232,345 shares of its common stock.
After the sale of shares in the issuer's secondary offering, Cross Atlantic Technology Fund, L.P. holds 668,572 shares of common stock, Cross Atlantic Technology Fund II, L.P. holds 2,230,198 shares of common stock and The Co-Investment 2000 Fund, L.P. holds 2,487,653 shares of common stock.