Dhaka, May 2 -- Apple shares fell 5 percent on Friday after the company trimmed its stock buyback programme and CEO Tim Cook flagged a $900 million tariff-related hit to costs this quarter amid a raging Sino-US trade war.

US President Donald Trump's tariff flip-flops have thrown corporate plans into disarray, even for Apple, which along with Microsoft, has been juggling the title of the world's most valuable company.

The company has been stocking up to cushion the blow from potential supply-chain snarls and rising US import costs. But with consumer confidence sliding, some analysts said Apple may face weakening iPhone demand in its home market.

Its decision to lower its buyback authorisation by $10 billion also marked a rare pullback t...