https://www.cnbc.com/2018/05/04/warren-buffetts-apple-bet-an-all-clear-signal-trader-art-cashin.html >Billionaire Warren Buffett's big bet on Apple is a telling sign for investors, closely followed trader Art Cashin told CNBC. >That's because the legendary investor stayed away from tech companies for a long time, saying he doesn't buy anything he can't understand, Cashin said.