Exhibit 99.3
JOINT FILING AGREEMENT
In accordance with Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a Statement on Schedule 13D (including amendments thereto) with respect to the shares of Common Stock, $0.001 par value, of Rubicon Technology, Inc. This Joint Filing Agreement shall be filed as an Exhibit to such Statement.
| Dated: November 17, 2017 | Bandera Master Fund L.P. | ||
| By: | Bandera Partners LLC its Investment Manager | ||
| By: | /s/ Jefferson Gramm | ||
| Name: | Jefferson Gramm | ||
| Title: | Managing Director | ||
| Bandera Partners LLC | |||
| By: | /s/ Jefferson Gramm | ||
| Name: | Jefferson Gramm | ||
| Title: | Managing Director | ||
| /s/ Gregory Bylinsky | |
| Gregory Bylinsky |
| /s/ Jefferson Gramm | |
| Jefferson Gramm |
