Samsung dropped four places in this year's list as annual revenues tumbled almost 11% and profits fell by more than half, largely due to a cyclical downturn in the memory-chip industry. The South Korean giant's top spot in phone manufacturing also continues to be threatened by Huawei, though that could change as the U.S. ratchets up sanctions against the Chinese rival. However, the biggest Samsung dramas involve top executives. In December, chairman Lee Sang-hoon was jailed for labor-law violations. And Samsung vice-chair and heir apparent Lee Jae-yong continues to battle accusations of financial fraud, which he has denied.