Amazon's quest for global domination has shown no signs of slowing in 2018. The e-commerce and cloud leviathan reached the trillion-dollar market value milestone in September, becoming the second company in the world to do so, and its Q3 earnings have beaten analysts' expectations. Needless to say, the Amazon share price has soared this year, up from $1,189.01 (£919.48) on 2 January to $1,712.43 (£1,324.25).
Going from strength to strength, Netflix overtook Disney in May to become America's most valuable media company, and the streaming service exceeded Wall Street predictions for Q3, adding a further 6.96 million subscribers. The company share price has risen impressively too this year, up from $201.07 (£155.55) at the beginning of 2018 to $294.07 (£227.67) at the time of writing.
A fierce bidding war between Comcast and Rupert Murdoch's 21st Century Fox that culminated in a blind auction in September has sent Sky shares skyrocketing this year, up from $1,310.84 (£1,016) at the start of January to $2,228.82 (£1,727.50). Comcast ended up winning the battle for the British media and telecoms company, outpacing Fox with a lavish offer of $39 billion (£30.2bn).
Harley-Davidson is having a horrific 2018 too, with its share price trading near a seven-year low, down from $52.06 (£40.30) at the beginning of January to $40.73 (£31.53). Trump administration tariffs have pushed up costs and sales have slipped as the iconic motorcycle manufacturer struggles to attract younger customers.
As well as Harley-Davidson, read about other iconic companies that are struggling under the Trump administration
Try as it might to stem the flow, Snapchat just can't stop losing users. The multimedia messaging app said goodbye to two million in the third quarter of this year, on top of the three million users who ditched it in Q2. Snapchat's declining popularity is reflected in its parent company's declining stock price which has fallen from $14.95 (£11.55) at the start of the year to $6.71 (£5.18) currently.
Read about the iconic American products that aren't made in the US
Floundering US retailer JCPenney has done nothing but disappoint investors this year, delivering a string of lacklustre financial results. The department store chain is drowning in debt and was forced to close eight stores this year after shuttering 138 in 2017. To cap it all, the company share price has fallen to its lowest level since the Great Depression, down from $3.50 (£2.70) at the start of the year to $1.28 (99p).
In even deeper trouble, Sears has had a nightmarish 2018. The struggling US retailer filed for bankruptcy protection last month and is closing 140 stores on top of the hundreds that have already shut their doors. Recently delisted from Nasdaq, Sears stock is now worth a humiliating 36 cents (26p), down from $3.78 (£2.92) at the start of 2018, an almost unbelievable drop of 91%.