Not all profitable companies are built to last - some rely on outdated models or unsustainable advantages. Just because a business is in the green today doesn’t mean it will thrive tomorrow.

Not all profitable companies are created equal, and that’s why we built StockStory - to help you find the ones that truly shine bright. That said, here is one profitable company that leverages its financial strength to beat the competition and two that may face some trouble.

Two Stocks to Sell:

Illumina (ILMN)

Trailing 12-Month GAAP Operating Margin: 18.2%

Pioneering the ability to read the human genome at unprecedented speed and affordability, Illumina (NASDAQ: ILMN) develops and sells advanced DNA sequencing and microarray technologies that allow researchers and clinicians to analyze genetic variations and functions.

Why Does ILMN Give Us Pause?

1. Organic sales performance over the past two years indicates the company may need to make strategic adjustments or rely on M&A to catalyze faster growth
2. Issuance of new shares over the last five years caused its earnings per share to fall by 2.2% annually while its revenue grew
3. ROIC of -0.7% reflects management’s challenges in identifying attractive investment opportunities

At $135.08 per share, Illumina trades at 26.7x forward P/E. If you’re considering ILMN for your portfolio, see our FREE research report to learn more.

Martin Marietta Materials (MLM)

Trailing 12-Month GAAP Operating Margin: 23.4%

Operating one of North America's largest networks of quarries, including 14 underground mines, Martin Marietta Materials (NYSE: MLM) is a natural resource-based building materials company that supplies aggregates, cement, and other construction materials for infrastructure and building projects.

Why Are We Wary of MLM?

1. Flat sales over the last two years suggest it must find different ways to grow during this cycle
2. Anticipated sales growth of 5.4% for the next year implies demand will be shaky
3. Earnings per share lagged its peers over the last two years as they only grew by 3.9% annually

Martin Marietta Materials is trading at $634.29 per share, or 29.2x forward P/E. Dive into our free research report to see why there are better opportunities than MLM.

One Stock to Buy:

American Superconductor (AMSC)

Trailing 12-Month GAAP Operating Margin: 4.5%

Founded in 1987, American Superconductor (NASDAQ: AMSC) has shifted from superconductor research to developing power systems, adapting to changing energy grid needs and naval technology requirements.

Why Are We Backing AMSC?

1. Impressive 49% annual revenue growth over the last two years indicates it’s winning market share this cycle
2. Free cash flow profile has moved into positive territory over the last five years, showing the company is at an important crossroads
3. Improving returns on capital suggest its past investments are beginning to deliver value

American Superconductor’s stock price of $31.39 implies a valuation ratio of 33.7x forward P/E. Is now the right time to buy? Find out in our full research report, it’s free for active Edge members.

High-Quality Stocks for All Market Conditions

Your portfolio can’t afford to be based on yesterday’s story. The risk in a handful of heavily crowded stocks is rising daily.

The names generating the next wave of massive growth are right here in our Top 9 Market-Beating Stocks. This is a curated list of our High Quality stocks that have generated a market-beating return of 244% over the last five years (as of June 30, 2025).

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