Xerox Corp. /zigman2/quotes/201169674/lastsale XRX -0.53% said in a Monday morning release that it was raising its offer for an HP Inc. /zigman2/quotes/203461582/lastsale HPQ +0.80% buyout to $24 a share from $22. The offer would be made up of $18.40 in cash and 0.149 Xerox shares for each HP share. HP has been pushing back against Xerox's attempts to buy the company for months, and Xerox recently nominated a slate of candidates for HP's board in an attempt to win shareholder support for a deal. HP shares are up 5.6% in premarket trading Monday, after closing Friday at $21.73. The stock has gained 11.3% over the past three months, as the S&P 500 /zigman2/quotes/210599714/realtime SPX -0.16% has risen 7.6%.