It began accumulating shares in the fund on Dec. 2, and now has a 35 percent stake.

Earlier this year, heavy trading in the stock sparked rumors that a raider might be accumulating shares.

My suggestion is that you take your time accumulating shares while investing in these oil companies over the next three months.

After this Philips began to gradually accumulate shares in the company over the years, and assumed complete economic control in 1993.

Buffett has been stealthily accumulating shares in the technology giant and announced his 5.5pc stake yesterday - worth $10.7bn.

Both have recently begun to accumulate shares of Quick & Reilly.

In fact, he borrowed money to keep accumulating shares as his stock options matured.

Mr. Ruff said his readers know to hold on to "holds," but not accumulate new shares.

Other investors, such as the Pritzker family of Chicago, are also said to be accumulating shares.