SoftBank has been at the forefront of a wave of call option purchases on US technology stocks that is distorting relations between derivatives instruments, as well as raising concern about a bubble in underlying equity prices.
The scale of the buying is questioned, with estimates ranging from $30 billion to $50 billion of notional call option purchases from SoftBank at a possible premium outlay of about $4 billion, while retail investors have also been active.
SoftBank declined to comment.
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