Many investors pay attention to mid-cap stocks because they have established business models and expansive market opportunities. However, their paths to becoming $100 billion corporations are ripe with competition, ranging from giants with vast resources to agile upstarts eager to disrupt the status quo.
These dynamics can rattle even the most seasoned professionals, which is why we started StockStory - to help you separate the good companies from the bad. That said, here is one mid-cap stock with a long growth runway and two that could be down big.
Two Mid-Cap Stocks to Sell:
Masco (MAS)
Market Cap: $13.3 billion
Headquartered just outside of Detroit, MI, Masco (NYSE:MAS) designs and manufactures home-building products such as glass shower doors, decorative lighting, bathtubs, and faucets.
Why Do We Think MAS Will Underperform?
- Absence of organic revenue growth over the past two years suggests it may have to lean into acquisitions to drive its expansion
- Projected sales growth of 1.7% for the next 12 months suggests sluggish demand
- Diminishing returns on capital suggest its earlier profit pools are drying up
At $67.81 per share, Masco trades at 15.5x forward P/E. Dive into our free research report to see why there are better opportunities than MAS.
CoStar (CSGP)
Market Cap: $11.77 billion
With a research department that makes over 10,000 property updates daily to its 35-year-old database, CoStar Group (NASDAQ:CSGP) provides comprehensive real estate data, analytics, and online marketplaces for commercial and residential properties in the U.S. and U.K.
Why Are We Cautious About CSGP?
- Day-to-day expenses have swelled relative to revenue over the last five years as its adjusted operating margin fell by 16.1 percentage points
- 10.8 percentage point decline in its free cash flow margin over the last five years reflects the company’s increased investments to defend its market position
- Diminishing returns on capital from an already low starting point show that neither management’s prior nor current bets are going as planned
CoStar’s stock price of $29.24 implies a valuation ratio of 19.2x forward P/E. To fully understand why you should be careful with CSGP, check out our full research report (it’s free).
One Mid-Cap Stock to Watch:
Lennox (LII)
Market Cap: $12.57 billion
Based in Texas and founded over a century ago, Lennox (NYSE:LII) is a climate control solutions company offering heating, ventilation, air conditioning, and refrigeration (HVACR) goods.
Why Do We Like LII?
- Healthy operating margin of 17.7% shows it’s a well-run company with efficient processes, and its rise over the last five years was fueled by some leverage on its fixed costs
- Free cash flow margin grew by 8.6 percentage points over the last five years, giving the company more chips to play with
- ROIC punches in at 37.3%, illustrating management’s expertise in identifying profitable investments
Lennox is trading at $363.61 per share, or 14.5x forward P/E. Is now a good time to buy? Find out in our full research report, it’s free.
Stocks We Like Even More
ONE MORE THING: Top 6 Stocks for This Week. This market is separating quality stocks from expensive ones fast. AI is taking down whole sectors with no warning. In a rotation this fast, you need more than a list of good companies.
Our AI system flagged Palantir before it ran 1,662% between October 2022 and February 2026. AppLovin before it ran 753% between February 2024 and February 2026. Nvidia before it ran 1,178% between January 2023 and February 2026. Each week it produces 6 new names that pass the same tests. Get Our Top 6 Stocks for Free HERE.
Stocks that made our list in 2020 include now familiar names such as Nvidia (+1,460% between June 2020 and June 2025) as well as under-the-radar businesses like the once-micro-cap company Kadant (+214% between June 2020 and June 2025). Find your next big winner with StockStory today.