Intel Corp. is in advanced talks to buy chip partner Altera Corp., according to people familiar with the matter, a move that would represent the semiconductor giant’s biggest-ever acquisition.

It wasn’t immediately clear how much Intel would pay for a deal. Altera had a market capitalization of about $10.4 billion before The Wall Street Journal first reported on the talks and ended Friday valued at $13.4 billion. It would be a big bite for Intel, which has historically stuck to smaller-size acquisitions.

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