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Best- and Worst-Performing Stocks
The Morningstar US Large-Mid Cap Index rose 1.33% in January. The large-mid index tracks the performance of the top 90% of the US investable universe by market cap, and each month we screen from among the stocks in this index to find the best- and worst-performing companies. Data in this article is sourced from Morningstar Direct.
The Best-Performing Stocks of January 2026
The Worst-Performing Stocks of January 2026
Metrics for the Best-Performing Stocks
SanDisk
SanDisk surged 142.75% in January. SanDisk has a Morningstar Rating of 3 stars, with its stock trading at a 14% discount to its $670 per share fair value estimate. The company listed on the Nasdaq on Feb. 13, 2025.
Bloom Energy
Bloom soared 74.21% in January, leaving the stock up 541.94% for the past year. The company’s stock has a Morningstar Rating of 1 star and trades at a 260% premium to its fair value estimate of $42 per share.
AST SpaceMobile
AST climbed 53.12% in January, leaving shares up 449.46% for the past year. AST has a quantitative Morningstar Rating of 1 star.
Seagate Technology
Seagate soared 48.04% in January, leaving the stock up 331.16% for the past year. The company’s stock has a Morningstar Rating of 3 stars and trades at a 9% premium to its fair value estimate of $375 per share.
Micron Technology
Micron surged 45.36% in January, leaving the stock up 356.21% for the past year. The company’s stock has a Morningstar Rating of 1 star, trading at an 84% premium to its fair value estimate of $225 per share.
Metrics for the Worst-Performing Stocks
Unity Software
Unity dove 34.12% in January, but shares still grew 31.08% over the past year. Stocks in the company were 44.20% below the last high on Dec. 11, 2025. Unity has a quantitative Morningstar Rating of 4 stars.
HubSpot
HubSpot sank 30.23% in January, leaving the stock down 64.08% for the past year. Shares were 68.22% lower than their last high on Feb. 13, 2025. The company’s stock has a Morningstar Rating of 5 stars and trades at a 57% discount to its fair value estimate of $650 per share.
Guidewire Software
Guidewire tumbled 29.97% in January, leaving shares down 33.37% for the past year. Stocks in the company were 48.36% below the last high on Sept. 5, 2025. Guidewire has a Morningstar Rating of 4 stars, with its stock trading at a 33% discount to its $210 per share fair value estimate.
AppLovin
AppLovin dropped 29.79% in January, however, shares were still up 28.01% for the past year. Shares were 36.55% lower than their last high on Sept. 29, 2025. The company’s stock has a Morningstar Rating of 3 stars and trades at a 5% discount to its fair value estimate of $500 per share.
Atlassian
Atlassian slid 27.11% in January, leaving the stock down 61.48% for the past year. Shares were 63.75% below their last high on Feb. 10, 2025. The stock has a Morningstar Rating of 5 stars, trading at a 49% discount to its fair value estimate of $230 per share.
Companies that are not formally covered by a Morningstar analyst are statistically matched to analyst-rated companies, allowing our models to calculate a quantitative star rating.