NEW YORK — Warren Buffett has been moving his personal investments from safe Treasuries into U.S. stocks, he wrote in an opinion piece in the New York Times.

"If prices keep looking attractive, my non-Berkshire net worth will soon be 100 percent in United States equities," he wrote Friday.

The piece, titled "Buy American. I am," reiterated one of the legendary investor's favorite maxims: Be fearful when others are greedy; be greedy when others are fearful.

"To be sure, investors are right to be wary of highly leveraged entities or businesses in weak competitive positions," he wrote.

"But fears regarding the long-term prosperity of the nation's many sound companies make no sense. These businesses will indeed suffer earnings hiccups, as they always have. "

Since stocks began to tumble in September, Buffett, and his investment company, Berkshire Hathaway Inc., have made large bets on U.S. companies, exacting rich dividend payments in the process.