UPDATE 1-Broadcom to buy back up to $12 bln of shares

(Adds details on Qualcomm offer, share move)

April 12 (Reuters) - Chipmaker Broadcom Inc said on Thursday it would buy back up to $12 billion of its common stock, sending its shares up 4.5 percent to $250 in extended trading.

The company, which last month ended its efforts to acquire rival Qualcomm Inc, said the repurchase program will begin effective immediately and could go on until the end of its fiscal year on Nov.3.

Broadcom moved back to the United States from Singapore earlier this month, following U.S. President Donald Trump's decision to block its $117 billion offer to buy Qualcomm on national security concerns.

The San Jose, California based company has about 411 million outstanding shares and a market value of about $98.71 billion as of Thursday's close. (Reporting by Uday Sampath in Bengaluru; Editing by Arun Koyyur)