Tibco Software Inc., a maker of software for businesses, agreed to be bought by Vista Equity Partners for about $4.3 billion in the biggest U.S. technology buyout this year.

Tibco stockholders will get $24 in cash a share, the Palo Alto, California-based company said in a statement today. That represents a 23 percent premium over the shares’ closing price of $19.51 on Sept. 26. The purchase price includes net debt, which was about $19.8 million as of Aug. 31, according to data provided by Bloomberg.

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