The unusual move comes as the world's largest technology company grapples with a tumbling share price, mounting competition in the smartphone and tablet markets and concerns about its ability to produce new breakthrough products.
Einhorn, a well-known short-seller and Apple gadget fan, said in an interview with CNBC that the company harbored a "Depression-era" mentality that led it to hoard cash and invest only in the safest, lowest-yielding securities.
