Cablevision Systems Corp might not have enough time to find a buyer for the company.

The USD4.6 billion cable operator was established four decades ago by Charles Dolan. With its highest valuation in two years, Cablevision would be able to take advantage in a surge in the industry, said Macquarie Group Ltd.

Cablevision shares rose by 42% within eight weeks. This was after speculations had heated up regarding the company's sale with its shareholders, Gamco Investors Inc. and Paulson & Co. said that a possible sale is likely to occur.

The New York-based company tried but failed to take itself private last 2005 and 2007. The company faced tough competition that included Time Warner Cable Inc. and Charter Communications Inc. This is a disadvantage for Cablevision the moment it misses out on wave of consolidation as cable operators had sought increased bargaining authority with channel owners. John Malone's Charter Communications had also considered merger with either Time Warner Cable or Cox Communications Inc., said a person familiar with the matter.