13D Filing: Aldebaran Capital, LLC and Rubicon Technology Inc. (RBCN)

Page 7 of 8 – SEC Filing

CUSIP No.  78112T206

Exhibit A

JOINT FILING AGREEMENT

The undersigned parties hereby agree to the joint filing of the Statement on Schedule 13D filed herewith, and any amendments hereto, relating to the Shares of Common Stock, $.001 par value, of Rubicon Technology, a Delaware corporation, with the Securities Exchange Commission pursuant to Rule 13d-1(k).

Dated: June 30, 2017

Aldebaran Capital, L.L.C.

By: /s/ Kenneth R. Skarbeck

Name: Kenneth R. Skarbeck

Title: Managing Member

/s/ Kenneth R. Skarbeck

Kenneth R. Skarbeck

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