Qualcomm shares fall 4.7 per cent to $59.85 premarket as President Donald Trump blocks Broadcom's $117 billion buyout bid on national security grounds.

Qualcomm shares at their lowest since reports of a Broadcom bid in November 2017, on track to lose $4.4 billion in market value if current prices hold.

AVGO shares marginally higher premarket on Tuesday.

Presidential order reflects a view that the US's lead in next-gen mobile tech would be lost to China if Singapore-based AVGO took over US-based Qualcomm, a White House official says

Trump's halt likely puts an end to a four-month takeover battle between the chipmakers.

Qualcomm had gained 14.5 per cent since reports of deal emerged in November, but have constantly stayed firmly below AVGO's offer price - raised to $82/shr after $70 offer was rejected.

However, AVGO lowered offer by $3 per share in February after Qualcomm raised its bid for NXP Semiconductors.

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