KEY POINTS
  • Warren Buffett stayed away from tech for a long time, so his purchase of 75 million shares of Apple is "more of an all-clear signal than anybody's seen," says Art Cashin.
  • Apple shares surged on the news, helping push the market higher.
  • Cashin expects stocks to keep seesawing. "The game's not over," he says.

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.