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According to The Striking Price Daily, spread betting has also increased, with many investors choosing to buy a call, then sell another for a higher price.
Indeed, one investor bought 5,000 April 13 calls and sold 5,000 April 10 puts, the news provider attests.
The value of Yahoo!'s stocks has declined of late, losing 62 per cent in the past six months alone.
However, the departure of Jerry Yang on Monday (November 17th) caused shares to increase by ten per cent in only one day as investors weighed up the likelihood of Microsoft trying another buyout, following its failed attempt earlier in 2008.
Youssef Squali, who follows Yahoo! for Jefferies & Co, said he has a $23 price target on the struggling internet search provider's stocks.
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