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Billionaire investor / takeover artist Carl Icahn. Reuters

Investor Carl Icahn revealed on Twitter Tuesday afternoon that he has taken a large position in Apple (NASDAQ:AAPL) and he said he views the firm as undervalued.

He also apparently would love to see Apple shake loose some more of its huge cash pile to shareholders via a share buyback, and given the feared activist’s track record he may just get it.

Tuesday on Twitter Icahn wrote, “We currently have a large position in APPLE. We believe the company to be extremely undervalued. Spoke to Tim Cook today. More to come.”

Three minutes later he twitted his kicker, “Had a nice conversation with Tim Cook today. Discussed my opinion that a larger buyback should be done now. We plan to speak again shortly.”