EXHIBIT 1 — JOINT FILING AGREEMENT
In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them a Statement on Schedule 13D (including amendments thereto) with regard to the Common stock, $0.01 par value, of Dynamex Inc. and further agree that this Joint Filing Agreement be included as an Exhibit to such joint filings. In evidence thereof, the undersigned, being duly authorized, hereby execute this Agreement as of October 4, 2010.
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| | LKCM Private Discipline Master Fund, SPC
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| | By: | LKCM Private Discipline Management, L.P., sole holder of its management shares | |
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| | By: | LKCM Alternative Management, LLC, its general partner | |
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| | By: LKCM Capital Group, LLC, its sole member
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| | By: | /s/ J. Bryan King | |
| | | J. Bryan King, President | |
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| | LKCM Investment Partnership, L.P.
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| | By: | LKCM Investment Partnership GP, LLC, its general partner | |
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| | By: | /s/ J. Luther King, Jr. | |
| | | J. Luther King, Jr., President | |
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| | LKCM Investment Partnership II, L.P.
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| | By: | LKCM Investment Partnership GP, LLC, its general partner | |
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| | By: | /s/ J. Luther King, Jr. | |
| | | J. Luther King, Jr., President | |
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| | LKCM Capital Group, LLC
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| | By: | /s/ J. Bryan King | |
| | | J. Bryan King, President | |
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| | LKCM Investment Partnership GP, LLC
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| | By: | /s/ J. Luther King, Jr. | |
| | | J. Luther King, Jr., President | |
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| | Luther King Capital Management Corporation
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| | By: | /s/ J. Bryan King | |
| | | J. Bryan King, Vice President | |
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| | /s/ J. Bryan King | |
| | J. Bryan King | |
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| | /s/ J. Luther King, Jr. | |
| | J. Luther King, Jr. | |
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