Supertex, Inc. : Supertex to Present at Stifel Nicolaus Annual Technology Conference

FOR IMMEDIATE RELEASE Corporate Headquarters:Christine Mahiya

Marcom Manager

408/222-4858 [e-mail]

SUPERTEX TO PRESENT AT STIFEL NICOLAUS ANNUAL TECHNOLOGY CONFERENCE

SUNNYVALE,CA-(Marketwire January 28, 2013) - Supertex, Inc. (NasdaqGS: SUPX), a recognized leader in high voltage analog and mixed signal integrated circuits (ICs), today announced that it will be presenting at the Stifel Nicolaus Annual Technology Conference, to be held at the Ritz-Carlton Hotel in San Francisco, California.

President and CEO, Henry C. Pao and Vice President of Finance and CFO, Phil Kagel, will be presenting at 2:40 p.m. (PT) on Tuesday, February 5, 2013. One-on-one meetings can be arranged through Stifel Nicolaus. A live audio webcast of the presentation will be available on the Investor Relations page of the Supertex corporate website at http://www.supertex.comand will be accessible for 30 days following the conference.

About Supertex

Supertex, Inc. is a publicly held mixed signal semiconductor manufacturer, focused on high voltage analog and mixed signal products for use in the medical, LED lighting, display, industrial and telecommunication industries. Supertex product, corporate and financial information is readily available at www.supertex.com.