2025 Most Gaining and Losing Stocks on the ABD Stock Exchange

Winners and Losers in the US Stock Market in 2025

The year 2025 was marked by the expansion of artificial intelligence trading in US stock markets and the leadership of chip stocks in the S&P 500. Shares of companies constructing data centers also saw significant growth. However, the economic uncertainty caused by tariffs imposed by President Donald Trump exerted pressure on the stocks of some companies.

The standout companies were particularly those involved in data storage. Here are the biggest winners and losers of 2025, as determined by the data:

Winner: New AI Leadership

Technology stocks, especially those associated with artificial intelligence, regained market dominance in 2025. Giants like Microsoft, Amazon, Alphabet, and Meta pledged over $440 billion in total investments to enhance their AI capabilities. These developments led to companies such as Sandisk, Western Digital, and Seagate Technology being among the best performers in the S&P 500.

Winner: Newly Added Companies to the S&P 500

The year 2025 saw the addition of many companies to the S&P 500 index, including Robinhood Markets, Sandisk, AppLovin, and Carvana. Each of these companies achieved triple-digit percentage gains, ranking among the top 20 in the index.

Winner: Palantir

Palantir shares are set to achieve triple-digit gains for the third consecutive year, thanks to strong retail investor support.

Winner: Warner Bros. Discovery

Warner Bros. Discovery estimated to have gained about 175% in value in 2025 due to acquisition speculations. The company received bids from Paramount and Netflix when it was put up for sale; the board considered Netflix’s offer.

Loser: Consumer Staples

The impact of economic uncertainty and tariffs negatively affected the stocks of major consumer staples companies. Clorox, Lamb Weston Holdings, Campbell's, and Constellation Brands were among the worst performers in the S&P 500.

Loser: Retail Sector

The same uncertainty also affected Deckers Outdoor, owner of the Hoka and Ugg brands; the company saw its nine-year streak of gains end, losing about 50% in value in 2025. Shares of Lululemon Athletica are also expected to drop by 45%.

Loser: Managed Healthcare Services

Healthcare insurance stocks performed poorly in 2025 despite expected changes from the policies of the Trump administration. Molina Healthcare shares lost over 40% of their value, while UnitedHealth Group and Centene Corp. shares also experienced declines of more than 30%.