News Corporation, which owns publisher HarperCollins, has expressed interest in acquiring CBS Corporation’s Simon & Schuster, reports The Wall Street Journal. This comes less than a month after News Corp. reportedly bid a $1.6 billion cash offer for Pearson’s Penguin book label. Penguin later agreed to merge with Bertelsmann’s Random House. Consolidation is seen by publishing houses as the best way to transition the industry to digital platforms, according to the WSJ.

The merger of HarperCollins and Simon & Schuster would create the second-largest publisher in the US, making up 18-20% of the book market. The Penguin and Random House merger would create a combined 28% to 30% of the market, according to Albert N. Greco Institute for Publishing Research Inc. (Above left chart courtesy of Wall Street Journal).