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Filing Details

Accession Number:: 0001181431-10-034475
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2010-06-23 13:00:00
Reporting Period:: 2010-06-21

Filing Date:: 2010-06-23
Accepted Time:: 2010-06-23 17:26:00
SEC Url:: Form 4 Filing

Issuer

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

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1211700	R Donald Caldwell	C/O Rubicon Technology Inc. 9931 Franklin Avenue Franklin Park IL 60131		Yes	No	Yes	No

Reported Non-Derivative Transactions

Show Other Fields >>

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

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	10,297	Direct

Footnotes

Includes 80 shares of restricted stock pursuant to grants that vest ratably over three years.
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. The Reporting Person 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. The Reporting Person 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. The Reporting Person 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. The Reporting Person disclaims beneficial ownership of the shares held by the Funds except to the extent of his pecuniary interest therein.
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.