Best- and Worst-Performing Stocks

The Morningstar US Large-Mid Cap Index rose 15.63% in the second quarter amid a rally in the technology sector. The index tracks the top 90% of the US investable universe by market cap, and each quarter, we screen it for the best- and worst-performing companies. Data in this article is sourced from Morningstar Direct.

The Best-Performing Stocks of Q2 2026

1. Astera Labs ALAB
2. Sandisk SNDK
3. Micron Technology MU
4. Intel INTC
5. Marvell Technology MRVL

The Worst-Performing Stocks of Q2 2026

1. Intuit INTU
2. Zoetis ZTS
3. Accenture ACN
4. Cognizant Technology Solutions CTSH
5. Insmed INSM

Metrics for the Best-Performing Stocks

Astera Labs

• Sector: Technology
• Industry: Semiconductors
• Economic Moat: Not Rated

Astera soared 340.71% in the quarter, leaving the stock up 434.20% for the past year. The stock has a quantitative Morningstar Rating of 1 star.

Sandisk

• Sector: Technology
• Industry: Computer Hardware
• Economic Moat: None

Sandisk surged 257.88% in the quarter, leaving it up 4913.74% for the past year. The stock has a Morningstar Rating of 1 star, trading at a 127% premium to its fair value estimate of $1,000 per share.

Micron Technology

• Sector: Technology
• Industry: Semiconductors
• Economic Moat: None

Micron soared 241.67% in the quarter, leaving the stock up 838.82% for the past year. The stock has a Morningstar Rating of 2 stars and trades at a 36% premium to its fair value estimate of $850 per share.

Intel

• Sector: Technology
• Industry: Semiconductors
• Economic Moat: None

Intel climbed 216.41% in the quarter, leaving shares up 523.35% for the past year. Intel has a Morningstar Rating of 2 stars, trading at a 55% premium to its fair value estimate of $90 per share.

Marvell Technology

• Sector: Technology
• Industry: Semiconductors
• Economic Moat: Narrow

Marvell surged 200.89% in the quarter, leaving it up 285.92% for the past year. The stock has a Morningstar Rating of 2 stars, trading at a 27% premium to its fair value estimate of $235 per share.

Metrics for the Worst-Performing Stocks

Intuit

• Sector: Technology
• Industry: Software - Application
• Economic Moat: Narrow

Intuit dove 39.44% in the quarter, leaving shares down 66.58% for the past year. Stocks in the company were 67.92% below their last high on July 30, 2025. Intuit has a Morningstar Rating of 5 stars, trading at a 43% discount to its fair value estimate of $455 per share.

Zoetis

• Sector: Healthcare
• Industry: Drug Manufacturers - Specialty & Generic
• Economic Moat: Wide

Zoetis sank 38.95% in the quarter, leaving the stock down 53.20% for the past year. Shares were 55.58% lower than their last high on July 10, 2025. The stock has a Morningstar Rating of 5 stars and trades at a 49% discount to its fair value estimate of $140 per share.

Accenture

• Sector: Technology
• Industry: Information Technology Services
• Economic Moat: Narrow

Accenture plunged 36.69% in the quarter, leaving it down 57.25% for the past year. Shares were 59.57% below their last high on July 8, 2025. The stock has a Morningstar Rating of 5 stars, trading at a 44% discount to its fair value estimate of $223 per share.

Cognizant Technology Solutions

• Sector: Technology
• Industry: Information Technology Services
• Economic Moat: Narrow

Cognizant sank 36.47% in the quarter, leaving the stock down 49.36% for the past year. Shares were 55.51% lower than their last high on Jan. 14, 2026. The stock has a Morningstar Rating of 5 stars and trades at a 54% discount to its fair value estimate of $84 per share.

Insmed

• Sector: Healthcare
• Industry: Biotechnology
• Economic Moat: Not Rated

Insmed plunged 34.80% in the quarter, while shares were still up 5.94% for the past year. Shares were 49.88% below their last high on Dec. 2, 2025. The stock has a quantitative Morningstar Rating of 3 stars.

Companies not formally covered by a Morningstar analyst are statistically matched to analyst-rated companies, allowing our models to calculate a quantitative star rating.