Value Investing Observatory
"Price is what you pay. Value is what you get."
Issue #18 · Weekly Stock Analysis · August 05, 2026
Welcome to this week's edition of The Buffett Lens, where we apply Warren Buffett's time-tested investment principles to identify stocks with durable competitive advantages, strong management, and sensible valuations.
Our quantitative model screens thousands of US-listed stocks against 26 key factors derived from Buffett's shareholder letters, including consistent earning power, high returns on equity with minimal debt, and favorable long-term prospects. The top-scoring stocks receive a detailed analysis written in the folksy, straightforward style that has characterized Berkshire Hathaway's communications for decades.
This week, we present 2 stocks that exemplify the principles of value investing.
Like a farmer who discovers a reliable spring on his land that keeps the fields watered year after year without constant digging, CNX Resources taps into the Appalachian Basin's natural gas deposits through its shale and coalbed methane operations. The company focuses on acquiring, exploring, and producing pipeline-quality gas for wholesalers, turning underground reserves into steady output rather than chasing flashy short-term spikes.
This setup shows real strength in delivering earnings power on the capital it employs. Over the last eight quarters, revenue has climbed from negligible levels to around $0.4 billion per quarter, with net income following to $0.2 billion, and the trailing twelve months show $2.2 billion in revenue alongside $0.9 billion in net income. The latest return on equity sits at 19.6 percent, with a five-year average near 17.4 percent, all while keeping debt to equity at just 0.49 times. That kind of performance without heavy borrowing or accounting tricks lines up with the idea that true managerial success shows up in high returns on equity capital, not merely rising earnings per share. The moat score of 61.9 out of 100 points to asset ownership and cost advantages that help protect margins, much like a castle with natural barriers against invaders. Management appears aligned too, with insiders holding 4.6 percent and institutions owning most of the rest, suggesting they have skin in the game and a focus on long-term operations rather than quick fixes.
Of course, no investment comes without its share of uncertainties, and energy businesses like this one face the humbling reality of commodity price swings that can turn a good year into a lean one overnight. Market fluctuations influence reported results, and past growth rates in the sector rarely repeat forever, so expectations must stay grounded in those economic facts. The moat is solid but not impenetrable, and external factors like regulations or shifts in demand could test even capable hands.
Still, at a current price of $34.54 with a market cap of $5.1 billion, the valuation metrics look inviting: a price-to-earnings ratio of 5.6 times, price-to-book near 1.1 times, and enterprise value to EBITDA at 4.1 times. These figures suggest the market may be underappreciating the intrinsic value tied to its producing assets and consistent returns. For patient investors who buy businesses at sensible prices and hold through cycles, this could offer a sensible entry point where the economics of the business itself do much of the heavy lifting over time. The ticker for CNX on eToro is $CNX. — Buffett Bot
Trade CNX — The ticker for CNX on eToro is $CNX
eToro is a multi-asset investment platform. Capital at risk.
| Metric | Value | Buffett Threshold | Status |
|---|---|---|---|
| ROE (Latest) | 19.6% | >15% | PASS |
| Debt/Equity | 0.49x | <0.5x | PASS |
| Gross Margin | 36.8% | >40% | FAIL |
| Market Cap | $5.1B | >$10B | FAIL |
| LTM Revenue (Last 4Q) | $2.2B | Positive, with YoY growth preferred | PASS |
| LTM Net Income (Last 4Q) | $0.9B | Positive, with YoY growth preferred | PASS |
BioMarin Pharmaceutical strikes me as something like a specialized orchard planted on rocky soil. It takes years of careful tending before the trees bear fruit, and only a handful of buyers will ever pay top dollar for the rare harvest, yet once established the operation can produce steady returns for decades if the roots hold.
This outfit shows some alignment with sound principles through its focus on therapies for uncommon diseases, backed by patent protections that create a decent barrier against quick imitators. The low debt relative to equity, at just 0.23 times, keeps the balance sheet sturdy and avoids the leverage traps that can sink even promising ventures. Revenue has climbed steadily over recent quarters to an LTM figure of $3.2 billion, with net income reaching $0.3 billion, suggesting the business boat itself carries potential once the products gain traction. Institutional holders dominate the ownership, which often signals confidence from those who study these fields closely.
Yet the numbers also reveal shortcomings that cannot be ignored. Return on equity sits at 4.3 percent lately, well below the levels that reliably compound owner wealth over time, and even the five-year average of 7.6 percent falls short of what strong economic performance demands, especially in an environment where inflation can erode real returns. The valuation multiples, with a P/E near 39 times and EV/EBITDA at 20 times, price in considerable optimism that may not materialize if development setbacks occur or if competition from other approaches intensifies. Biotech work involves heavy research spending that can mask underlying economics until the patents face expiration.
In my view, the long-term prospects rest on whether management can lift those returns on capital through disciplined product launches and efficient operations rather than relying solely on scientific breakthroughs. At the current price around $60, the shares trade at a premium that rewards patience only if earnings power grows consistently from here; hasty expectations could lead to disappointment, while a measured holding period allows time for the underlying economics to prove themselves. The ticker for BioMarin Pharmaceutical Inc. on eToro is $BMRN. — Buffett Bot
Trade BioMarin Pharmaceutical Inc. — The ticker for BioMarin Pharmaceutical Inc. on eToro is $BMRN
eToro is a multi-asset investment platform. Capital at risk.
| Metric | Value | Buffett Threshold | Status |
|---|---|---|---|
| ROE (Latest) | 4.3% | >15% | FAIL |
| Debt/Equity | 0.23x | <0.5x | PASS |
| Gross Margin | 74.6% | >40% | PASS |
| Market Cap | $11.6B | >$10B | PASS |
| LTM Revenue (Last 4Q) | $3.2B | Positive, with YoY growth preferred | PASS |
| LTM Net Income (Last 4Q) | $0.3B | Positive, with YoY growth preferred | PASS |
The following stocks from previous issues have fallen below our Buffett thresholds. We believe in accountability - when our picks deteriorate, you should know.
Recommended in Issue #11 (2026-06-10) with score 67.4
Current score: 65.0 (-2.4 points)
ROE: 14.5% | Debt/Equity: 0.31x | Gross Margin: 15.6%
Consider reviewing your position.
Recommended in Issue #4 (2026-03-25) with score 80.1
Current score: 78.0 (-2.1 points)
ROE: 25.1% | Debt/Equity: 0.98x | Gross Margin: 38.3%
Consider reviewing your position.
Recommended in Issue #3 (2026-03-18) with score 77.6
Current score: 78.0 (+0.4 points)
ROE: 25.1% | Debt/Equity: 0.98x | Gross Margin: 38.3%
Consider reviewing your position.
Recommended in Issue #11 (2026-06-10) with score 67.0
Current score: 73.0 (+6.0 points)
ROE: 9.2% | Debt/Equity: 0.29x | Gross Margin: 39.2%
Consider reviewing your position.
This newsletter is for educational and informational purposes only and should not be construed as investment advice. The analyses presented are based on publicly available information and quantitative models. Past performance does not guarantee future results. Always conduct your own research and consult with a qualified financial advisor before making investment decisions.
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