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 July 1st, 2026 | 07:15 CEST
Bitcoin to Zero? Lahontan Gold Remains Stable! USD 800 Million Waiting in Nevada
Three of the world's most well-known investors have never been fans of Bitcoin. One of them is now warning that the cryptocurrency could eventually fall to zero. As the digital (so-called) gold substitute comes under pressure, even traditional precious metals are currently experiencing a pronounced phase of weakness. Nevertheless, the share price of an emerging gold producer remains notably stable—and for good reason. Lahontan Gold is on the verge of a potential breakthrough and could remain highly profitable even if the price of gold were to halve. The company is backed by a management team with a proven track record.
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Commented by Jens Castner on June 30th, 2026 | 07:40 CEST
Diesel Is Dead, Long Live Diesel: What Is Next for Volkswagen, Traton, dynaCERT, and Cummins
Since the diesel scandal a good ten years ago, Volkswagen has been lurching from one crisis to the next. Now, plant closures and massive job cuts loom. Meanwhile, its commercial vehicle subsidiary, Traton, is grappling with the key question: Should its diesel fleet be replaced? An innovative company from Toronto takes the position that nothing needs to be replaced at all: dynaCERT improves the efficiency and emissions of engines that have long been on the road. And Cummins, of all companies, a US giant that builds precisely such engines, provides the unintended proof that the transition away from the internal combustion engine will take a very long time. We take a look at what this means for investors.
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Commented by Jens Castner on June 29th, 2026 | 06:35 CEST
The Cleanup Artists: Zefiro Methane, 374Water, Befesa, and the Multi-Billion-Dollar Market for Contaminated Sites
Burning faucets, contaminated groundwater, toxic dust from steel furnaces - industry leaves behind contaminated sites that conventional disposal solutions are powerless to address. Three companies have identified a market niche precisely in this area. Zefiro Methane plugs millions of abandoned wells in the US, 374Water eliminates "forever chemicals," and Befesa turns the toxic filter dust from the steel industry into usable zinc. The logic behind all three business models is the same: the more severe the environmental damage, the larger the market and strict regulation becomes a revenue driver here, rather than a risk factor as in other industries.
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Commented by Jens Castner on June 26th, 2026 | 07:30 CEST
Idolized, Sold Off, Forgotten: What is Next for Coinbase, HelloFresh, and American Atomics
On the stock market today, more than ever, greed clouds judgment. When a trend persists long enough, the market begins to treat it as a law of nature—projecting growth rates into a future they are unlikely to sustain. Coinbase, HelloFresh, and American Atomics illustrate this dynamic in very different ways: from a leveraged crypto bet to a pandemic winner in decline to a uranium explorer that is arguably mispriced based on spot commodity sentiment. Now, far removed from their peak euphoria, all three are largely trading out of the spotlight. This raises a central question: which of these stocks deserves a second look?
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Commented by Jens Castner on June 25th, 2026 | 07:25 CEST
GOLD PRICE ON A DOWNWARD TREND! WHY GLOBEX MINING, Q-GOLD, AND ALAMOS ARE STILL SHINING
The gold price has recently dropped noticeably, and this immediately raises the question of what this means for mining companies. There is no one-size-fits-all answer; it all depends on the individual company's story. Those who secure the right deposits early and at a low cost, those who reliably manage their production, or those who participate in third-party projects without owning a mine of their own, can still earn handsomely even at prices of USD 4,000 per ounce. This is precisely what connects three companies: the up-and-coming explorer Q-Gold, the established producer Alamos Gold, and Globex Mining Enterprises, a debt-free royalty company that derives its income from licensing rights. Three different ways to profit from the precious metals shortage—and three good reasons to take a closer look at them at current prices.
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Commented by Jens Castner on June 24th, 2026 | 08:20 CEST
DIVIDENDS WITH SUBSTANCE: INTESA SANPAOLO, DWS GROUP, AND RE ROYALTIES UNDER THE MICROSCOPE
Dividend stocks have a decisive advantage in turbulent market conditions: They do not just promise dividends—they actually pay them. Investors who receive regular dividends are less reliant on perfectly timing their entry and exit points. The ongoing income cushions price fluctuations and provides predictability. But not every high dividend is a good dividend. What matters most is the sustainability of the payout. Ideally, a company combines both—an attractive yield and the fundamentals to sustain it over the long term. That is exactly what the major Italian bank Intesa Sanpaolo, the German asset manager DWS Group, and the Canadian renewable energy specialist RE Royalties offer. Three stocks, three risk profiles—and in each case, good reasons to take a closer look.
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Commented by Jens Castner on June 23rd, 2026 | 07:05 CEST
STELLANTIS, PURE ONE, AND VOLVO: THREE BETS ON THE FUTURE OF ZERO-EMISSION DRIVETRAINS
Electromobility is a divisive issue—both on the stock market and on the road. While Stellantis is supposedly trading at bargain levels following an 80% drop in its share price, investors are paying a hefty valuation premium for Volvo, the Swedish truck market leader. In between them is Pure One, an Australian micro-cap company that is reinventing the capital-intensive heavy-duty commercial vehicle business using the Apple model—and, according to analysts, has the potential to become a tenbagger. Three companies, three risk profiles, one common theme: Who has the lead in the race for zero-emission propulsion? A status report.
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Commented by Jens Castner on June 22nd, 2026 | 06:45 CEST
RBC, VOLATUS AEROSPACE, AND SHOPIFY: CANADA'S UNDERRATED WORLD-CLASS COMPANIES
Canada's stock market offers a highly attractive mix of ultra-stable, strictly regulated dividend strength and dynamic, cutting-edge technology. Three examples highlight why the global public should keep an eye not only on the country's national soccer team but also on the Toronto stock market. From the defensive banking pioneer RBC to the up-and-coming defence contractor Volatus Aerospace to the global tech powerhouse Shopify. What all three companies have in common is that they strategically leverage artificial intelligence (AI) to deliver real value to their customers.
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Commented by Jens Castner on June 19th, 2026 | 07:40 CEST
CHIPS, WAFERS, AND BATTERIES: TSMC DOMINATES, SILTRONIC STRUGGLES, HPQ SILICON GOES ON THE OFFENSIVE
The global technology industry is facing its greatest test yet. The battle for supremacy in microchips and battery materials has long since taken on a highly explosive geopolitical dimension. While nearly the entire tech sector is dependent on the Taiwanese giant TSMC, the operational hurdles faced by the German wafer specialist Siltronic reveal just how vulnerable Western supply chains really are. But away from the billion-dollar conglomerates, a new generation of challengers is quietly emerging. A prime example is the Canadian cleantech company HPQ Silicon, which is preparing to tackle dependence on Asian raw material monopolies at the root through disruptive plasma technologies.
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Commented by Jens Castner on June 18th, 2026 | 07:30 CEST
THE LAHONTAN GOLD FILE: HOW A GEOLOGICAL DETECTIVE TEAM IS AWAKENING NEVADA'S SLEEPING GIANTS
There are historical criminal cases that were never truly solved. One such "cold case" is the Santa Fe Gold Mine in Nevada. For three decades, the case file lay forgotten on a shelf: too old, too small, too uninteresting—until the geological detective duo Kimberly Ann and Brian Maher of Lahontan Gold retrieved the dusty drill cores from the evidence room to reexamine the evidence. The result of their investigation: millions of ounces of gold equivalent await discovery. The Santa Fe file is currently being rewritten—and those who start reading it early enough could be among the winners.
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