TV maker and media company Vizio Holding Corp. (NYSE: VZIO) began trading on the New York Stock Exchange Thursday with an opening price of $21 per share.

The IPO gives Vizio an initial valuation of about $4 billion.

The Irvine-based company’s offering totals 12.25 million shares of Class A common stock.

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Vizio’s originally proposed pricing was in the range of $21 to $23.

The company sells flat-screen TVs and sound bars in addition to leveraging its SmartCast operating system to sell advertising.

Vizio closed last year with revenue over $2 billion and net income of $102.5 million.

For more on Vizio, see next week's print edition of the Business Journal.