The Nuremberg native brings over three decades of capital markets experience, backed by a career shaped by deep market insight and a genuine passion for investing. His journey began in 1994 through an investment club among colleagues – a formative experience that sparked a lifelong dedication to identifying compelling investment opportunities.
Following senior editorial roles at Nürnberger Nachrichten, €uro am Sonntag, and €uro, he went on to serve as Editor-in-Chief of the renowned investor magazine Börse Online from 2014, where he played a key role in shaping high-quality financial journalism for a broad investor audience.
Since April 2026, he has been operating independently, fully focused on his core strength: uncovering mispriced equities with significant upside potential – particularly within the small- and mid-cap segment, where inefficiencies create attractive opportunities for discerning investors.
Throughout his career, he has engaged with some of the most influential minds in global finance, including Warren Buffett, Charlie Munger, Jim Rogers, and George Soros. The unique insights gained from these conversations continue to inform his analytical perspective today. As a dedicated value investor, he is committed to translating complex market dynamics into clear, actionable ideas – empowering investors to make better-informed decisions.
Commented by Jens Castner
Commented by Jens Castner on September 17th, 2026 | 08:50 CEST
From Farm to Supermarket Shelf: MustGrow Biologics, Sprouts and Hain Celestial Fuel the Appetite for Organic
Created and Published on Behalf of MustGrow Biologics Corp.
Healthy, sustainable, organic: the trend toward conscious eating shows no signs of slowing down. Yet the sector has recently disappointed on the stock market. Soaring costs for raw materials and logistics are eating into producers' margins, while inflation is forcing consumers to be more cautious at the checkout. But these lean years can also create opportunities. A closer look at the entire value chain, from the field to the supermarket shelf, reveals three very different cases: MustGrow Biologics, Hain Celestial and Sprouts Farmers Market. A comparison of the trio reveals where analysts see the greatest upside potential.
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Commented by Jens Castner on September 16th, 2026 | 06:50 CEST
Tungsten, Beer and Vaccines: What Almonty Industries, Heineken and BioNTech Have in Common
A commodities company whose share price has tripled in a single year because an unassuming heavy metal has become a sought-after, scarce commodity. A brewing giant that has been operating a cash cow in Africa for decades and has a clear strategy for increasing margins. A pharmaceutical pioneer writing its next chapter after the end of the COVID boom—with a factory that literally consists of shipping containers. At first glance, Almonty Industries, Heineken and BioNTech do not have much in common. But upon closer inspection, all three are betting on the same underrated market. Here is how you, as an investor, can benefit.
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Commented by Jens Castner on September 15th, 2026 | 08:00 CEST
Chronically Undervalued: When Will the Knot Finally Break for Mountain Alliance, Lahontan Gold and Mercedes-Benz?
Some companies are brimming with substance – and yet their share prices barely move. Three current examples illustrate different forms of this phenomenon. Mountain Alliance is an investment company whose portfolio is worth significantly more than its share price suggests; Lahontan Gold is an explorer whose freely accessible precious-metal resources far exceed its market capitalization; and Mercedes-Benz is a classic that investors are currently shying away from due to political and economic concerns. Undervaluation is rarely a coincidence; rather, it has tangible causes. But there are equally tangible arguments for a re-rating.
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Commented by Jens Castner on September 14th, 2026 | 08:30 CEST
A Breakout That Was Predicted: How AI Is Leading Volatus Aerospace, SoftBank, and SAP Out of Their Downward Trends
Three broken downward trends, one common catalyst: artificial intelligence. For Volatus Aerospace, SoftBank, and SAP, the chart picture looks completely different from what it did just a few weeks ago—and in all three cases, there is a strong fundamental story behind it. The Canadian drone specialist is securing major new contracts from the defence sector, the Japanese investment holding company is benefiting from the upcoming Anthropic IPO, and the German software giant is proving with strong cloud figures that it should be counted among the AI winners rather than its victims. Three completely different business models, three trend reversals—and the question of how much potential these stocks still hold.
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Commented by Jens Castner on September 11th, 2026 | 07:50 CEST
ZEFIRO METHANE: DOWNTREND BROKEN, STOCK GAINING MOMENTUM – ANALYSTS SEE 200% UPSIDE
Created and Published on Behalf of Zefiro Methane.
America has a methane problem. Millions of orphaned oil and gas wells lie beneath forests, pastures, and residential areas. Many are leaking, and their owners are deceased, insolvent, or no longer locatable. Zefiro Methane offers solutions to permanently plug these climate-damaging wells and prevent further greenhouse gas emissions. So far, the company, which can barely keep up with the volume of orders, is known only to a small circle of insiders. The stock is still trading in the penny stock territory. However, analysts expect that to change soon. Their price targets indicate upside potential ranging from 50% to more than 200%.
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Commented by Jens Castner on September 3rd, 2026 | 08:20 CEST
Roadmap Instead of Guesswork: Finexity, Lahontan Gold and BMW on a Clear Path to the Future
Promises about the future are what drive the stock market. But they are not always credible. Some companies, however, openly lay out their roadmaps—with clearly defined milestones rather than mere hope. Three examples illustrate just how different this can look: Finexity, a Hamburg-based fintech company reinventing securities trading; Lahontan Gold, a Canadian exploration company on the verge of entering production; and German blue-chip BMW. The Munich-based automaker is defining a "Neue Klasse" (New Class) not just on the road. Investors should keep all three stocks on their radar.
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Commented by Jens Castner on August 31st, 2026 | 07:25 CEST
Arms Boom Meets Steel Revolution: A New Era for Salzgitter, Strategic Resources and SSAB
Europe is rearming. Above all, the continent needs steel to do so. Tanks, frigates and submarines consume quantities of material that are pushing existing production facilities to their limits. At the same time, a quieter but equally consequential transformation is underway: the shift toward more climate-friendly steelmaking processes. Whoever controls the raw material supply chains behind this transition holds the key to a story that the market has yet to price in. This is where Strategic Resources, a still largely undiscovered small-cap, has all the pieces in place. The Canadian company delivers exactly what German industry heavyweights such as Salzgitter are desperately seeking. Swedish steel and armored steel monopolist SSAB has already begun exploring the opportunity.
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Commented by Jens Castner on August 28th, 2026 | 10:00 CEST
Wind, Hydrogen, World-Class Dividend: Nordex and Enapter Battle It Out, RE Royalties Cashes In
The energy transition showcases every facet of stock-market madness. Nordex shares have multiplied in value, but suddenly politics and analysts are creating headwinds. Enapter, meanwhile, is at rock bottom and is looking to fight its way back up. At the other end of the spectrum is a Canadian small-cap that benefits from the growth of new energy without building a single wind turbine or electrolyser itself: RE Royalties. For years, the company has reliably paid high dividends, yet its share price stubbornly refuses to budge. Investors can choose between a hydrogen crash, a wind power roller coaster, and a world-class dividend.
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Commented by Jens Castner on August 27th, 2026 | 07:15 CEST
Like a Phoenix Rising from the Ashes: Deutsche Telekom, Almonty and Abbott Are Back on Track
For months, Deutsche Telekom, Almonty Industries, and Abbott Laboratories were headed in only one direction: down. Then the quarterly results came in—and with them, a breakthrough. For Deutsche Telekom and Almonty, a combination of growth and share buybacks sparked the initial rally; for Abbott, it was the confirmation that two negative one-time effects were only temporary. A sustained breakout from the downtrend is now a reality for all three stocks. How far is the road back to previous highs, and where do analysts even see potential for new all-time highs?
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Commented by Jens Castner on August 26th, 2026 | 10:10 CEST
Amazon, Volatus Aerospace and SUSS Microtec: Three Stocks, One Pattern - And Up To 100% Upside Potential
First came the euphoria, then the disappointment. A pattern has recently emerged in the stock market: even strong quarterly results rarely sustain the initial share price surge. That is because, upon closer inspection, question marks often arise—for example, regarding Amazon's investments, SUSS MicroTec's conservative full-year outlook, or the restructuring of Volatus Aerospace's business model. The three companies represent very different applications of artificial intelligence: cloud infrastructure, manufacturing equipment for the semiconductor industry, and AI-powered autonomous drones. The good news: following these setbacks, analysts once again see significant upside potential—25%, 50%, or even 100%.
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